TWI619582B - Torque control system of electric impact type torque tool and torque control method thereof - Google Patents

Abstract

The invention discloses a torsion control system of an electric impact type torque tool and a torque control method thereof. Before the operation, the relationship between the high and low working voltages of the tool that can be operated normally and the corresponding high and low torques that can be output is established. Further, within the range of the maximum and minimum torque values on the relationship curve, any target torque value is input to obtain an operating voltage corresponding to the target torque value for locking operation; during the process, the microprocessor of the torque control device The sensing signal and the voltage and current sensing component and the temperature sensing component continuously detect the change of voltage, current and motor temperature by the torque sensing device, and the operating voltage is stably controlled by the voltage control module. Set within a tolerance range to achieve the purpose of controlling the locking torque.

Description

Torque control system of electric impact type torque tool and torque control method thereof

The invention provides a torsion control system for an electric impact type torque tool and a torque control method thereof, in particular to an electric shock type torsion plate driven by a torque/control device to a brushed or brushless motor using an AC/DC power source. The torque sensing device of the hand and its output end, the control system for controlling the tightening torque of the bolt and the control method thereof.

Torque control devices and methods for electric impact torque tools are numerous. For various AC/DC motors, the common control requirements are often torque, position, speed or acceleration. In order to achieve these control objectives, the signal fed back by the sensor needs to be adjusted with the controller. The motor is a mechanism that converts the electric energy input into the kinetic energy output by electromechanical integration. Therefore, the main control is electric energy. However, in the control of electric energy, only three factors of voltage magnitude, current direction and frequency can be adjusted, and among the three elements, The current direction is relatively simple to control the positive and negative rotation, and the frequency mainly corresponds to the control of the induction motor. However, for the real control target, such as: torque, position, speed or acceleration, it is actually controlled by the voltage magnitude, so The voltage magnitude is the main parameter that needs to be adjusted by the controller.

Please refer to FIG. 1 , which is a schematic diagram of the application of an electric shock-type wrench driven by an AC/DC motor and a built-in torque sensing device. (1-1) is a rechargeable impact wrench 2d composed of a control circuit board 21d, a DC motor 22d, and an impact mechanism 23d disposed in the housing and electrically connected to a rechargeable battery 1. (1-2) The charging type impact wrench 2d' of the built-in torque sensing device is built in between the impact mechanism 23d' and the output end 25 in the housing of the rechargeable impact wrench 2d of (1-1) a torque sensing device 24d, and then The DC motor 22d and the impact mechanism 23d' are driven by the control circuit board 21d' to apply a bolt corresponding to a bolt sleeve and a size corresponding to the type through the output end 25' to lock a coupling member. (1-3) is an AC electric shock wrench 2a composed of a control circuit board 21a, an AC motor 22a, and an impact mechanism 23a provided in the casing, and is electrically connected to an AC power source 1'. (1-4) is an alternating current impact wrench 2a' of the built-in torque sensing device, and is built in between the impact mechanism 23a' and the output end 25' in the housing of the alternating current impact wrench 2a of (1-3) The torque sensing device 24a drives a bolt sleeve and a bolt corresponding to the type to lock a coupling member. Among them, 2d and 2a are mainly open-loop control that controls the torque by controlling the torque and controlling the current, and there is almost no control over the torque of the output end of the impact mechanism. The rechargeable impact wrench 2d' and the alternating current impact wrench 2a' are transmitted in a wired manner by the built-in torque sensing devices 24d and 24a, and the torque or angle signals are transmitted to the control circuit board. 21d' and 21a', the closed loop control, the torsion control at the output end of the impact mechanism has a significant improvement.

The above-mentioned conventional electric impact type torque tool, in use, taps the output shaft of the tool by the impact mechanism of the device at the output end of the motor, and drives the sleeve to lock the bolt. The torque of the lock is usually controlled only by adjusting the voltage of the motor output or the tension of the spring against the clutch. Torque sensing devices are also installed at the front end of the tool's output shaft to detect changes in torque and tightening angle. However, although the same output voltage is set, and by the process of twisting the output shaft, the deformation, the rotation angle, and even the length of the locking time after the bolt veneer are monitored to control the torque, but the tool is encountered. The power output capability of the vehicle itself is gradually attenuated during use, and the impact mechanism of the impact tool is relatively easy to wear, or after the oil pressure pulse tool is continuously operated for a period of time, the oil temperature of the hydraulic cylinder rises, causing the attenuation of the original set torque, or With the same set of torque, to lock the soft and hard different firmware to be locked, even if the operator is holding the tool for a long time, it must be tired so that it can not maintain a fixed operating posture, etc. It will lead to the inability to achieve stable locking torque. The result of the judgment can only be warned, and effective torque control cannot be performed on the above problems.

Therefore, how to invent a torque control system of an electric impact type torque tool and a torque control method thereof, which can continuously transmit the sensed signal back to the built-in or externally-mounted torque control device during operation, by the microprocessor The voltage/current sensing component continuously detects the change of the voltage and current, and then stably controls the working voltage within a preset allowable variation range through the voltage control module to achieve the purpose of controlling the locking torque, which will be the present invention. What you want to actively expose.

To achieve the above and other objects, the present invention provides a torque control method for an electric impact type torque tool for use in a locking operation of an electric impact type or hydraulic pulse type torque tool, which comprises the following steps: self-power supply The module is connected to a torque control device built in or externally connected to the input end of the electric impact type torque tool, and outputs a stable working voltage to drive the electric impact type torque tool and the torque sensing device built in or externally connected to the output end; The electric impact type torque tool drives the electric impact type torque tool and the torque sensing device respectively at a maximum working voltage and a minimum working voltage, and the locking torque is verified before the locking operation; And establishing a voltage-torque correspondence curve according to the highest working voltage and the minimum working voltage and the corresponding maximum torque value and the minimum torque value respectively; according to the corresponding relationship between the voltage and the torque, the input is between a target torque value between the maximum torque value and the minimum torque value to obtain a The working voltage is applied, and the electric impact type torque tool and the torque sensing device built in or externally connected to the output end are driven by the working voltage to perform the locking operation; during the locking process, the torque sensing device is continuously returned The sensing signal transmitted to the torque control device is compared with the voltage and torque stored in the memory unit by the microprocessor in the torque control device, and the corresponding working power is obtained. Pressure, the torque control of the closed circuit, the microprocessor continuously detects the change of voltage, current and temperature according to the voltage/current sensing component and the temperature sensing component, and then stably controls the working voltage through the voltage control module. Within the preset allowable variation range, the purpose of controlling the locking torque is achieved, and when the target torque value is reached, the power source is cut off and a warning is issued.

In the above-mentioned torque control method of the electric impact type torque tool, the verification work of the locking torque further includes the following steps: driving the torque sensing device with the electric impact type torque tool, and performing the verification operation through the torque control device During the locking process, the voltage signal sensed by the voltage/current sensing component and the torque signal sensed by the torque sensing device are simultaneously stored in the memory unit of the torque control device, and the height is two points. The torque check and sample average of the complex point and complex array between voltages are used to establish the corresponding relationship between the voltage and torque of the electric impact type torque tool under normal operation.

The torque control method of the above-mentioned electric impact type torque tool further comprises the following steps: directly locking the joint member with the electric impact type torque tool, and then using a torque verification tool to obtain the torque for locking or loosening And inputting the torque value to the torque control device through the keyboard; together with the voltage and current variation values of a voltage/current sensing component in the torque control device, together with the erection process of the locking operation To the memory unit of the torque control device, the torque check and the sample average value of the complex point and the complex array between the high and low voltages are used to establish the voltage and torque of the electric impact type torque tool under normal operation. Correspondence curve.

The torque control method of the above-mentioned electric impact type torque tool further includes the following steps: automatically repeating the locking operation of the high and low voltages or the plurality of points and the plurality of times to obtain the plural number according to the preset program. The maximum torque value and the minimum torque value respectively corresponding to the highest working voltage of the group and the minimum operating voltage; accumulating and averaging the maximum torque of the complex array a value, the minimum torque value, the highest working voltage and the minimum operating voltage, and establishing the corresponding relationship between the voltage and the torque according to the averaged maximum torque value, the minimum torque value, the highest working voltage, and the lowest operating voltage .

The torque control method of the above-mentioned electric impact type torque tool further includes the following steps: when the difference between the actual torque value and the target torque value is too large, the torque revision key can be utilized; the microprocessor automatically adjusts the voltage and torque according to the revised torque value. Corresponding relationship curve, simultaneously displaying the adjusted controllable torque range; when re-entering the target torque value, according to the adjusted relationship between the torque and the working voltage, obtaining the adjusted work corresponding to the target torque value The voltage is used to drive the electric impact type torque tool to lock the target voltage to reach the target range.

In the above-mentioned torque control method for the electric impact type torque tool, the method further comprises the steps of: inputting a torque check value instead of the displayed torque value; replacing the original display torque value in the voltage and torque corresponding relationship curve with the substitute torque value, The working voltage corresponding to the torque value is maintained unchanged. When the target torque value is re-inputted, according to the adjusted relationship between the torque and the working voltage, the electric shock type torque tool can be driven by the working voltage to perform the locking operation. Obtain the desired target torque value.

The above-mentioned torque control method of the electric impact type torque tool further includes the following steps: the torque check value does not match the target torque value, but the control reproducibility is stable, as long as the torque value of the relationship curve is modified, the curve is unchanged, and the lock is fixed. During the process of torque calibration, the voltage of the whole process monitors the voltage change; when the voltage fluctuation exceeds the allowable variation range, an alert is issued via a warning device, or the power output to the electric impact torque tool is cut off.

The present invention further provides a torque control system for an electric impact type torque tool, which is connected to a torque control device by a power supply module to drive an electric impact type torque tool and A torque sensing device built in or externally attached to the output end thereof for locking operation, comprising: a torque control device and a torque sensing device; the torque control device includes a microprocessor, and is based on the torque sensing device The torque and angle sensing signals are continuously transmitted back to the torque control device. After the amplification operation, the voltage and torque stored in the memory unit are compared to obtain the working voltage corresponding to the target torque value, and the closed loop torque control is locked. During the operation, the voltage/current sensing component and the temperature sensing component continuously detect the change of the voltage, current and temperature, and then pass the voltage control module to stably control the working voltage within a preset allowable variation range. In order to control the locking torque, and within the range of the target torque value, the power source is cut off and a warning is issued; a voltage control module continuously detects the voltage and current by the voltage/current sensing component and the temperature sensing component. And the temperature change, the working voltage is stably controlled within a preset allowable variation range to control the locking torque; a voltage/current sensing For detecting the change of the working voltage and current of the motor during the operation, and immediately feeding back to the microprocessor for reference of voltage or current control; a temperature sensing component for detecting the temperature rise of the motor, and instantly feeding back The microprocessor performs voltage or current control reference; an output unit and an input unit are used for each torque setting value, deformation sensing value, target torque value, and control related signal transmission in the system; a display unit It is used to display the voltage and torque unit, the target torque value and the corresponding working voltage, the number of locks and the locking operation; a warning unit is based on the result of the microprocessor calculation and judgment, and the warning is given by the light or sound; Wired/wireless communication module for wired or wireless information transmission with a torque sensing device; a memory unit for storing a maximum torque obtained by the electric impact torque tool with a maximum working voltage and a minimum operating voltage a value and a minimum torque value and associated operating conditions; and the torque sensing device is built-in or externally attached to the power tool impact mechanism , Which includes a torsion sensing unit, a module and a circuit board electrically connected to the battery cells do, wherein the circuit board module further includes a microprocessor , an amplifying circuit unit, an angle sensing unit, a memory unit, an output input unit, a charging circuit unit and a communication unit.

In the torque control system of the above-mentioned electric impact type torque tool, the voltage control module can also be a current control module, which is driven according to a maximum working current and a minimum operating current that can be normally operated by the electric impact type torque tool at that time. The electric impact type torque tool and the torsion sensing device perform the calibration work of the locking torque before the locking operation; and according to the highest working current and the minimum working current respectively verified and the corresponding maximum torque value And a minimum torque value, establishing a corresponding relationship between current and torque; according to the current and torque correspondence curve, inputting a target torque value between the maximum torque value and the minimum torque value to obtain a corresponding Working current, and driving the electric impact type torque tool and the torque sensing device built in or externally connected to the output end to perform the locking operation; during the locking process, the torque sensing device is continuously transmitted back to the The sensing signal of the torque control device is compared with the memory unit after being amplified by the microprocessor in the torque control device First store the relationship curve, get the corresponding working current, and perform the closed loop torque control. The microprocessor continuously detects the voltage, current and temperature changes according to the voltage/current sensing component and the temperature sensing component, and then transmits the current. The control module stably controls the working current within a preset allowable variation range to control the locking torque, and when the target torque value is reached, the power source is cut off and a warning is issued.

In the above-mentioned torque control system of the electric impact type torque tool, the microprocessor corrects and adjusts the corresponding relationship between the current and the torque according to the input modified torque value, and when the target torque value is re-entered, according to the adjusted The corresponding relationship between the current and the torque indicates a new corresponding working current, and the working current is used to drive the electric impact type torque tool for locking operation.

Therefore, the torque control system of the electric impact type torque tool of the present invention and the torque control method thereof can be continuously transmitted back to the tool built-in or plug-in during the operation process by the torque sensing device built in or externally connected to the tool output end. The sensing signal of the torque control device is continuously detected by the microprocessor according to the voltage/current sensing component, and then the voltage control current or the current control module is used to stably control the working voltage or current. Set within a tolerance range to achieve the purpose of controlling the locking torque.

1‧‧‧Rechargeable battery

1'‧‧‧AC power supply

2a, 2a’, 2a”, 2a’”‧‧‧ AC impact wrench

2d, 2d’, 2d”, 2d’” ‧‧‧ Cordless impact wrench

21a, 21a', 21d, 21d'‧‧‧ control circuit board

21a", 21a"', 21d", 21d"'‧‧‧ Torque control

211‧‧‧Microprocessor

212‧‧‧Voltage Control Module

212'‧‧‧ Current Control Module

213‧‧‧Voltage/current sensing components

214‧‧‧Temperature sensing components

215‧‧‧ Analog Digital Converter

216‧‧‧Communication Module

2161‧‧‧Wireless communication unit

2162‧‧‧Wired communication unit

217‧‧‧ input unit

218‧‧‧Output unit

219‧‧‧Display unit

220‧‧‧Warning unit

221‧‧‧ memory unit

22a‧‧‧AC motor

22d‧‧‧DC motor

23a, 23a’, 23d, 23d’‧‧‧ impact mechanisms

24a, 24a', 24d, 24d'‧‧‧ torque sensing devices

25, 25’‧‧‧ output

3‧‧‧Torque sensing device

31‧‧‧Circuit board module

311‧‧‧Microprocessor

312‧‧‧Amplification circuit unit

313‧‧‧Angle sensing unit

314‧‧‧Wireless/wired communication unit

315‧‧‧ memory unit

32‧‧‧Torque sensing unit

33‧‧‧Power supply unit

4‧‧‧Bolt sleeve

5‧‧‧ bolt

6‧‧‧Connected parts

S11~S14‧‧‧Steps

[Fig. 1] is a schematic view showing the application of a conventional electric impact type torque tool and a built-in torque sensing device.

2 is a schematic view showing the application of the external impact or built-in torque sensing device of the electric impact type torque tool of the present invention.

[Fig. 3] is a graph showing the relationship between the voltage obtained by the experimental observation and the actual output torque according to the torque control method of the present invention.

[Fig. 4] is a graph showing the relationship between the high and low working voltages of the torque control method of the present invention and the high and low torques corresponding to the actual measurement.

Fig. 5 is a diagram showing the steps of implementing the torque control method of the present invention.

Fig. 6 is a block diagram showing an embodiment of voltage control of the torque control system of the present invention.

FIG. 7 is a schematic diagram of the correction operation of the corresponding relationship between the voltage and the torque of the torque control method of the present invention.

FIG. 8 is a diagram showing the relationship between the current obtained by experimental observation and the actual output torque according to another torque control method of the present invention.

[Fig. 9] is a graph showing the relationship between the high and low operating currents of the torque control method of the present invention and the high and low torques corresponding to the actual measurement.

Fig. 10 is a block diagram showing an embodiment of current control of the torque control system of the present invention.

In order to fully understand the object, features and advantages of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings, which are illustrated as follows: Schematic diagram of the application of the invention of the AC/DC motor driven electric impact wrench or external built-in torque sensing device. (2-1) is a charging type impact wrench 2d" of the external torque sensing device, which is connected to the output end 25 of the charging type impact wrench 2d of the figure (1-1), and is connected to a torque sensing device 3 And through the torque control device 21d" through the output end 25' of the torque sensing device 3, to drive a bolt sleeve 4 and a bolt 5 corresponding in size and type, to lock a coupling member 6 (the bolt sleeve 4, The bolt 5 and the coupling member 6 are as shown in Figs. 6 and 10). (2-2) The charging type impact wrench 2d'" which is a built-in torque sensing device is the impact mechanism 23d' and the output end 25 in the housing of the rechargeable impact wrench 2d" of Fig. (2-1) A torque sensing device 24d' is built in between, and a bolt sleeve 4 and a bolt 5 corresponding to the size are driven through the output end 25' via the torque control device 21d" to lock a coupling member 6. (2 -3) is an alternating current impact wrench 2a" of the external torque sensing device, and is connected to a torque sensing device 3 of the alternating current impact wrench 2a of (1-3), and then via a torque control device 21a" Through the output end 25' of the torque sensing device 3, a bolt sleeve 4 and a bolt 5 corresponding in size and type are driven to lock a coupling member 6. (2-4) is an alternating current of a built-in torque sensing device. The impact wrench 2a'" is formed between the impact mechanism 23a' and the output end 25 in the housing of the alternating current impact wrench 2a" of the figure (2-3), and a torque sensing device 24a' is built in, and then The torque control device 21a"' drives a bolt sleeve 4 and a bolt 5 corresponding to the size through the output end 25' to lock a coupling member 6The illustration (2-1)~(2-4) of the present invention, whether it is a sense of torque The measuring device 3 is externally mounted or 24d' built in the AC/DC power tool, except that it has a microprocessor that is continuously returned to the torque control device by wireless or wired returning during the locking process as in the conventional built-in torque sensing device. To do the related torque or speed control, and to use the observation of the impact type electric tool combined with the torque sensing device, the pulse characteristics presented in the locking process and the measured data, verify the control method of the present invention to completely solve the impact Power tools are difficult to control the problem of locking torque.

Please refer to FIG. 3 , which is a diagram showing the relationship between the voltage obtained by the experimental observation and the actual output torque according to the torque control method of the present invention. In the figure, the same electric impact type torque tool and the external torque sensing device are used to stably control the working voltage within a very small variation range, and the same joint member of the same nature is locked with the same striking time, and the same material is locked. The bolts of the size, and the tools are driven by the voltages of 5V, 6V, 7V, 8V, 9V, 10V, 11V, 12V, 13V, 14V, respectively, can respectively measure a fairly regular stable torque value. Here, only the partial graphics are excerpted, and the high and low voltages and the corresponding sensed magnitude torque values exhibit a nearly linear relationship. According to the above theoretical and experimental data, it is proved that the present invention uses the electric impact type torsion tool to apply torque to the same joint member, and the same electric shock type torsion wrench, under stable working voltage conditions and the same locking time, The same soft and hard joints will get the same close tightening torque value, that is, the electric torque wrench will monitor the percentage change of the working voltage during the whole process of locking, so that it maintains a stable variation range. The locking torque can be controlled within a certain target range.

Please refer to FIG. 4 , which is a graph showing the relationship between the high and low working voltages of the torque control method of the present invention and the high and low torques corresponding to the actual measurement. Fig. 4 is a graph showing the relationship between the high and low torque of the measured data according to Fig. 3, and using the characteristics of the impact type and the hydraulic pulse type electric torque tool to pass the preset control parameters with the same tool, for example: the same voltage and the same lock Solid time, and under stable and full-scale monitored voltage operating conditions, the same soft and hard coupling will output the same stable torque, first detect the tool's current output capacity, the highest voltage that can work normally V _H and the lowest voltage V _L , the driving tool and the torque sensing device, verify the maximum torque T _H and the minimum torque T _L respectively generated under the highest voltage and the lowest voltage, and establish a voltage by linear regression. Curve Ls with torque. Therefore, as long as the target torque value is arbitrarily input within the maximum and minimum torque ranges obtained by the calibration of the tool, the microprocessor of the torque control device of the present invention immediately operates according to the corresponding relationship between the built-in voltage and the torque. And automatically adjust to the corresponding working voltage, to drive the tool to lock the operation, and in the whole process of locking, monitor the working voltage, maintain the stable working voltage for locking, and cut when the target torque value is reached Disconnect the power supply and stop the electric impact torque tool. In this way, the torque of the output can be controlled within a preset allowable range without worrying about problems between the control or the sensing elements, the reaction delay due to the signal transmission delay, and the control accuracy. However, due to a number of factors, such as the gap between the sleeve and the bolt used, the manner in which the tool is held, and the condition of the joint, the torque value obtained by the verification does not exhibit a completely linear relationship with the voltage. In practical applications, the linear upper and lower offsets can be regarded as the error value of the control, and finally the satisfactory torque control accuracy can still be obtained.

Please refer to FIG. 5 , which is a schematic diagram of the implementation steps of the torque control method of the present invention. As shown in the figure, the torque control method of the present invention comprises the following steps: (S11) connecting a power supply module and an electric impact type torque tool, driving a built-in or external plug-in through a torque control device built-in or externally attached to the tool The torque sensing device of the tool output end first detects the highest voltage V _H and the lowest voltage V _{L of} the tool under the current output capability; (S12) re-drives the tool and the torque sensing device, locks the bolt and waits a locking joint to verify and establish the maximum and minimum voltages at which the tool can operate at the time and the corresponding maximum and minimum torque; (S13) within the maximum and minimum torque values on the relationship Entering any target torque value, and after comparing the operation of the microprocessor in the control device, comparing the relationship curve pre-stored in the memory unit to obtain a working voltage corresponding to the target torque value for driving the electric shock Torque tool for locking operation; (S14) in the locking process, the sensing signal is continuously transmitted back to the control device by the sensing device, and the closed circuit is performed. Force control lock operation. The microprocessor continuously detects the change of voltage, current and motor temperature according to the voltage and current sensing component and the temperature sensing component, and then controls the working voltage to be stably controlled within a preset allowable variation range through the voltage control module. Control the purpose of locking torque. When the target torque value is within the range, the power source is turned off and a warning is issued.

Preferably, the method further comprises the steps of: verifying the maximum and minimum torque values corresponding to the highest and lowest voltages in a manual mode using the torque sensing device or any torque verification tool of the present invention, and inputting the same to the torque control device At the same time, the voltage/current sensing component of the torque control device is used to obtain the voltage/current change during the locking process, and together with the dynamic relationship curve obtained by verifying the average torque value of the complex array above the complex point, A memory unit that is stored to the torque control device.

Preferably, the method further comprises the steps of: pressing the check button according to the set automatic verification mode, and the torque control device automatically detects the highest and lowest voltages at which the tool can work normally, and the built-in or plug-in of the tool output end is matched with the tool output end. The torque sensing device performs the verification of the voltage of the complex array above the complex point and the corresponding torque value according to the preset program to obtain the average value of the voltage of the complex array above the complex point and the corresponding torque value. The data is used to establish a relationship between the high/low voltage of the tool and the corresponding torque value, and is stored in the memory unit of the torque control device.

Preferably, when the locking torque does not reach or exceed the upper and lower allowable range of the target value, fine adjustment or correction of the relationship curve can be performed. The main reason is that when the relationship between the torque and the high and low working voltage of the tool is established, the conditions used for the test verification and the firmware to be locked in the actual locking work, the degree of hardness and the condition of the bolt may be different. Result and target of measured torque value obtained by locking The value has a large error. The torque can be revised by the torque to make the locking torque closer to the target value. Therefore, in practice, it is best to check the relationship between the high and low working voltage and the output torque of the actual output. Otherwise, it may be necessary to improve the control accuracy through this torque correction mode.

Preferably, the following corrections can be made when the following conditions occur; that is, when the actual torque value displayed is at the upper and lower limit edges of the target torque value, the torque correction button is pressed, and the microprocessor automatically switches the operating voltage along The relationship curve is fine-tuned up and down. After restarting the tool, the torque value closer to the target value can be obtained; or the difference between the detected value of the customer's quality assurance personnel and the actual value displayed by the torque control device is too large, but the actual value and the detected value are reproducible and stable. When the sex is excellent, press the torque correction button and pause for about 1 second. After the controller screen pops out of the numeric keypad, enter the customer-approved detection value, press the ENTER key, the microprocessor will automatically fine-tune the working voltage along the relationship curve. After inputting the original target torque again, after the starting tool is locked, the quality assurance personnel can detect it again to achieve the required torque control accuracy.

Preferably, the method further comprises the following steps: before establishing the above relationship, the control related parameters are first set, for example; the highest working voltage is set to be 90% or 95% of the maximum value of the system detection as required for torque compensation. Additional kinetic energy, that is, when the power output capability of the aforementioned tool itself is gradually attenuated during use, or after a continuous operation for a period of time, the hydraulic cylinder that generates the oil pressure pulse causes the original set torque to decline due to the rise of the oil temperature, or With the same torque setting, it can lock the soft and hard locks to be locked. Even if the operator is holding the tool for a long time, it will not be able to maintain a fixed posture due to fatigue, and the microprocessor will automatically The working voltage is adjusted upward along the relationship curve to compensate for the torque. When the target torque is reached, the power is turned off, or when the target torque is not reached when the voltage limit is reached, the display unit is alerted.

Preferably, the method further comprises the steps of: monitoring the change of the voltage during the locking creping process; and controlling the power output of the electric shock type torque tool to be cut off when the change exceeds the allowable range, and simultaneously alerting through the warning unit.

Please refer to FIG. 6, which is a block diagram of an embodiment of voltage control of the torque control system of the present invention. As shown in the figure, the torque control devices 21d", 21d"', 21a", 21a"' of the present invention are mainly DC motors 22a and ACs mounted on a power supply module 1, 1' and an electric impact type torque tool. Between the motors 22d. The torque control devices 21d", 21d"', 21a", 21a"' include a microprocessor 211, a voltage control module 212, a voltage/current sensing component 213, a temperature sensing component 214, and an analogous digit. The converter 215, a communication module 216, an input unit 217, an output unit 218, a display unit 219, an alert unit 220, and a memory unit 221. Both of the microprocessors 211 are electrically connected to the power supply modules 1, 1 ' to drive the AC/DC motors 22a, 22d. Figure 6-1 shows the torque sensing device 24d', 24a' built between the output end 25 of the impact mechanism 23d', 23a' in the tool housing and the output shaft 25', and Figure 6-2 shows the torque The sensing device 3 is externally attached between the tool output shaft 25 and the sleeve 4. The torque sensing device 24d', 24a' or 3 comprises a torque sensing unit 32, a power supply unit 33 and a circuit board module 31. The circuit board module 31 further includes an amplifying circuit unit 312, a microprocessor 311, an angle sensing unit 313, a wireless/wired communication unit 314, and a memory unit 315. At the time of verification, a torque is applied to the torsion and angle sensing device, and at the same time, the relationship between the deformation generated by the torque sensing unit 32 and the torque is stored in the memory unit 315. During the locking process, the torque sensing device 24d', 24a' or 3 continuously transmits the torque or angle sensing signal to the torque control device 21d", 21d''', 21a" via the wireless/wired communication unit 314. The communication module 216 of the 21a''' is amplified by the microprocessor 211 in the torque control device, and the operating power curve corresponding to the target torque value is obtained by comparing the power relationship curve stored in the memory unit, and the closed loop torque control lock is performed. Tight work. During the process, the microprocessor 211 continuously detects the change of voltage, current and temperature by the voltage/current sensing component 213 and the temperature sensing component 214, and then controls the operating voltage to be stably controlled by the voltage control module 212. A tolerance range is allowed to achieve the purpose of controlling the locking torque. When the target torque value is reached, the power source 1 , 1 ′ is cut off by the warning unit 220 and the result is displayed by the display unit 219 .

Wherein, the voltage control module 212 can adopt a PWM controller (modulation of pulse width), adjust the supply of a stable voltage to drive the motor or the PID controller (proportional-integral-derivative controller), and compensate according to the error amount, that is, Pressurize or depressurize according to the proportional relationship.

The microprocessors 211 and 311 can automatically adjust the corresponding relationship between the originally established voltage and the torque according to the revised torque value input by the operator according to the torque verification, and according to the corrected relationship between the voltage and the torque, Enter the target torque value to obtain a new working voltage, and then use this working voltage to drive the electric impact torque tool for locking work.

Wherein, when the locking torque does not reach or exceed the upper and lower allowable range of the target value, fine adjustment or correction of the relationship curve can be performed. Mainly because of the relationship between the torque and the high and low working voltage of the tool, the conditions of the test binding component and the actual locking work, the hardness and the condition of the bolt may be different, so that the locking is tight. The resulting torque value results in a large error. The torque can be revised by the torque to make the locking torque closer to the target value. Therefore, in practice, it is best to check the relationship curve between the high and low working voltages for the actual joint parts. Otherwise, it may be necessary to improve the control accuracy through the torque correction mode. Preferably, the correction mode can be separately adopted when the following conditions occur; that is, when the actual value displayed is at the upper and lower limits of the target value, the torque correction button is pressed, and the microprocessor automatically switches the working voltage along the relationship. The curve is fine-tuned up and down, and after restarting the tool, you can get a closer target value.

Wherein, the difference between the detected value of the customer's quality assurance personnel and the actual value displayed by the controller is too large, but when the actual value and the reproducibility and stability of the detected value are excellent, the microprocessor can revise the actual value to the warranty. The measured value of the person; press the torque correction button and stop for about 1 second. After the controller screen pops out of the numeric keypad, enter the customer-approved detection value, press the ENTER key, the microprocessor will automatically fine-tune the working voltage along the relationship curve. After inputting the original target torque again, after the starting tool is locked, the quality assurance personnel can detect it again to achieve the required torque control accuracy.

The torque control system and the torque control method thereof of the present invention can also utilize the characteristics of the impact type and the oil pressure pulse type electric torque tool, with the same tool under a predetermined operating condition, such as; with the same current and the same Locking time, and under the condition of stable and full-process monitored current, the same stable torque will be output for the same soft and hard joints. Before the locking operation, the tool's output will be detected. The highest and lowest currents that can be operated normally; the re-driving tool and the torque sensing device verify the maximum and minimum tightening capacity (or ~torque or torque) generated under the highest and lowest current conditions to establish a Relationship curve; then, within the range of maximum and minimum torque values on the relationship curve, any target torque value is input to obtain a working voltage corresponding to the target torque value, and then the electric impact type torque tool is started to drive the built-in Or a torque sensing device externally attached to the output end thereof for locking operation; during the locking process, the torque sensing device is continuously transmitted back to the torque control Opposing torque or angle sensing signal, the microprocessor within the device amplified torque control operation of the curve than the memory cell to store the lock value corresponding to the operating current target torque, the locking operation for closing torque control loops. During the process, the microprocessor continuously detects the change information of the voltage, current, and motor temperature according to the sensing information transmitted by the self-torque sensing device in a wireless manner, and the voltage/current sensing component and the temperature sensing component continuously pass through. The current control module stably controls the working current within a preset allowable variation range to achieve the purpose of controlling the locking torque. And within the range of the target torque value When the power source is cut off and a warning is issued. After the locking operation is performed, it is verified whether the locking torque is within a preset range, and if necessary, the above-mentioned torque correction operation can be implemented, so that the locking torque can be controlled in a more precise range, and such an impact torque tool It is no longer necessary to trace the manufacturing precision of the torque control related mechanism of the tool itself, but only by the torque control system and the control method thereof, the impact or pulse type torque wrench can be easily locked. The job is more economical, reliable and efficient than any known control technology.

Please refer to FIG. 7 , which is a schematic diagram of the correcting operation curve of the voltage and torque of the torque control method of the present invention. Please also refer to Figure 6, the operator can use its usual or more trusted torque calibration tool to verify the torque after locking, the torque value obtained by the calibration, such as the target torque value T _X is significantly different The correction value (not shown) of the input unit 217 of the torque control device 21d", 21d"', 21a", 21a"' can be input to the corrected torque value and stored in the memory unit 221, and then The processor 211 will automatically adjust the voltage-torque correspondence curve L _S according to the revised torque value T _XI , and the adjusted voltage-torque correspondence curve is L _M , and display the newly set controllable torque range. In simple terms, when the input revised torque value T _{XI is} less than the target torque value T _X , the voltage versus torque curve will be offset downward (as shown in Figure 7 (a)), and when the revised torque value When T _{XI is} greater than the target torque value T _X , the voltage-torque curve will be offset upward (as shown in Figure 7(b)). After the target torque value is re-entered, the newly revised relationship curve L _M On, a new corresponding working voltage V _XI will be obtained. With this new working voltage V _XI driving the rechargeable impact wrench 2d", 2d"'AC impact wrench 2a", 2a"' to lock, you need to check again to determine if you get the right target Torque value. In addition to precisely controlling the torque of the output of the impact-type torque tool, the user is allowed to fine-tune during the torque calibration according to the different conditions of the joint used to meet the actual needs.

It is worth mentioning that during the locking process, if the detected voltage exceeds the preset allowable variation range, the torque control devices 21d", 21d"', 21a", 21a"' promptly use the warning module 220 to issue a warning or The voltage control module 212 cuts off the power supply and waits for the voltage to return to a stable voltage range before the locking operation can be performed. In addition, the allowable range of variation is related to the accuracy of the torque value during actual locking operations. In short, the greater the allowable variation range, the worse the accuracy of the torque control.

Please refer to FIG. 8 , which is a diagram showing the relationship between the current obtained by experimental observation and the actual output torque according to another torque control method of the present invention. In the figure, the inventors use the same electric impact type torsion wrench and the external torsion sensing device to stably control the working current within a very small variation range, and lock the same joint member of the same nature with the same strike time. Bolts of the same material and size, driven by 12A, 14A, 16A, 18A, 20A, 22A currents, can also measure a fairly regular torque value. Here, only a part of the graph is excerpted, and the high and low currents and the corresponding sensed magnitude and torque values exhibit a nearly linear relationship. Based on the above theoretical and experimental data, the inventors have demonstrated that when an electric impact type torque tool applies torque to the same joint member, it has a characteristic; that is, a stable operating current with the same impact type electric torque wrench. Under the condition, as well as the same locking time, the same tight locking torque value will be obtained for the combination of the same soft and hard nature. That is to say, the electric torsion wrench can control the locking torque within a certain target range as long as the percentage of change of the working current is monitored during the whole process of locking to maintain a stable variation range.

Please refer to FIG. 9 , which is a graph showing the relationship between the high and low operating currents of the torque control method of the present invention and the high and low torques corresponding to the actual measurement. According to the measured data of Figure 8, and using the impact and hydraulic pulsed electric torque tools to use the same tool, through the preset control parameters, such as the same voltage and the same locking time, and in a stable and fully monitored under current operating conditions, soft and hard member for the same binding properties, stability will output the same torque, the first detection output at the time the tool's ability, the maximum current a _H can work with the lowest current a _L, the torsion driving tool The sensing device verifies the maximum torque T _H and the minimum torque T _L respectively generated under the conditions of the highest current and the lowest current, and establishes a current-torque relationship Ls' by linear regression. Therefore, as long as the target torque value is arbitrarily input within the maximum and minimum torque ranges obtained by the tool verification, the microprocessor of the torque control device of the present invention immediately operates according to the corresponding relationship between the built-in current and the torque. And automatically adjust to the corresponding working current, to drive the tool to lock the operation, and in the whole process of locking, monitor the working voltage and current, maintain a stable working current for locking, and reach the target torque value When the power is turned off, the tool is stopped, and thus the torque of the output can be controlled within a preset allowable range. When the lock is tightened, if the torque value obtained by the check is significantly different from the target torque value T _X , the actual torque value can also be adjusted to be within the range closest to the target value in the same manner as shown in FIG. 7 .

Please refer to FIG. 10, which is a block diagram of an embodiment of current control of the torque control system of the present invention. The same control effect can be achieved by simply changing the voltage control module 212 in the torque control devices 21d", 21d"', 21a", 21a"' of Fig. 6 to the current control module 212'. It is only based on factors such as technical difficulty and cost of control. Although it is proved to be feasible, voltage control should be preferred.

Due to the structure of the tool and the precision of manufacturing and assembly, there is no absolute influence on the control of the torsion. Generally, the amount of current passing through the tool and the time of controlling the striking, or simple voltage control, cannot achieve satisfactory results. Especially for impact or pulse type impact type torque tools, even if a torque sensing device is installed, it is difficult to detect due to the unstable signal generated by the pulse, and it is more difficult to use various types of joint members and locked fasteners, whether it is material or not. , hardness, surface roughness, processing conditions of the spiral joint surface, and the structure of the gasket and the joint surface between the joint and the fastener. The order of bolting and other soft and hard bonding problems, etc., the impact on the final locking torque or Clamping Force control accuracy is much greater than the quality or accuracy of the tool itself.

The invention breaks through the myth of the traditional electric impact type torque tool manufacturer that it is difficult to control the torque of this type of tool, fully understands the relationship between the pulse signal and the torque of the impact or pulse type torque tool, grasps the technology of the pulse signal acquisition, and eliminates the telecommunications transmission. The interference of the time, before the locking operation, for the characteristics of the joint and the locked fastener used for each locking operation, using a torque control device, first verify and establish the highest and lowest working voltage that the tool can operate normally or The current versus the respective maximum and minimum tightening torque values. Then, in the range of the maximum and minimum torque values, any target torque value can be input, and the microprocessor borrows the known target torque on the relationship curve between the pre-established working voltage or current and the corresponding locking torque value. How much working voltage or current is needed to drive the tool, automatically adjust and prompt the working voltage or current corresponding to the target torque value to the display unit, the operator can perform the lockable locking operation, and the whole process of the locking operation The purpose of torque control can be achieved by monitoring the change of voltage or current according to preset operation and control conditions.

The method for torque control and the torque control system thereof provided by the invention can achieve precise torque control by using any of the electric impact type torque tools under the condition of the technical features defined by the invention, and the torque control method of the invention and The torque control device emphasizes the maximum and minimum working voltage or current and the corresponding maximum and minimum locking of the tool which can be operated normally by pre-checking under the condition of maintaining stable working voltage or current for the duration of the locking. Within the relationship of the torque value, the required target torque value can be arbitrarily input to obtain a corresponding working voltage or current, and the electric shock type torque tool and the torque built in or externally connected to the output end thereof are driven by the working voltage or current. The sensing device is locked. During the operation, the microprocessor prompts the corresponding working voltage or current, and then adjusts to the correct voltage or current by manual or automatic voltage regulation, and then locks with the driving tool, and locks the torque. Control accuracy, you can adjust the allowable operating voltage or current fluctuation range according to the required accuracy, and also allow the user to correct the aforementioned voltage or current and torque relationship curve according to the actual torque value measured by the calibration. For more precise twist-lock work.

The present invention has been disclosed in the above preferred embodiments, and it should be understood by those skilled in the art that the present invention is only used to describe the present invention and should not be construed as limiting the scope of the present invention. The locking torque is proportional to the working voltage or current. As long as the working voltage or current during the locking process can be stably controlled within an allowable variation range, the torque of the output can be controlled within a target range. In view of the above, the torque control method of the present invention is described only with respect to the voltage control, and the above description is merely exemplary and not limiting. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.

Claims (10)

A torque control method for an electric impact type torque tool is applied to a locking operation of an electric impact type or hydraulic pulse type torque tool, which comprises the following steps: connecting from a power supply module to a built-in or externally connected electric device The torque control device of the input end of the impact type torque tool drives the electric impact type torque tool and the torque sensing device built in or externally connected to the output end thereof according to the output of a stable working voltage, according to which the electric impact type torque tool can be operated normally at that time. The highest working voltage and the lowest working voltage respectively drive the electric impact type torque tool and the torque sensing device, and perform the locking torque verification operation before the locking operation; the highest working voltage and the minimum according to the separately verified The working voltage and the corresponding maximum torque value and the minimum torque value establish a corresponding relationship between voltage and torque; according to the corresponding relationship between the voltage and the torque, input a value between the maximum torque value and the minimum torque value a target torque value to obtain a corresponding operating voltage and drive the electricity at the operating voltage The impact type torque tool and the torque sensing device built in or externally connected to the output end thereof perform the locking operation; and during the locking process, the torque sensing device continuously returns the sensing signal to the torque control device, and the torque is transmitted. After the microprocessor in the control device amplifies the operation, the corresponding operating voltage is obtained by comparing the pre-stored power relationship curves in the memory unit, and the torque control of the closed circuit is performed, and the microprocessor senses the component according to the voltage/current. The temperature sensing component continuously detects changes in voltage, current and temperature, and then through the voltage control module, stably controls the working voltage within a preset allowable variation range to control the locking torque and achieve the target torque value. When the range is within, cut off the power source and provide a warning. A torque control method for an electric impact type torque tool according to claim 1, wherein the lock The tightening force calibration operation further includes the following steps: driving the torque sensing device with the electric impact type torque tool, and simultaneously extracting a voltage/current sensing during the locking operation of the calibration operation device by the torque control device The voltage signal sensed by the component and the torque signal sensed by the torque sensing device are stored together in a memory unit of the torque control device, and the calibration and sampling average values of the complex point and the complex array between the high and low voltages are performed. For establishing the corresponding relationship between the voltage and the torque of the electric impact type torque tool under normal operation. The torque control method of the electric impact type torque tool according to claim 1, further comprising the steps of: directly locking the joint member with the electric impact type torque tool, and then using a torque check tool to obtain the lock Or loose torque value, and the torque value is input to the torque control device through the keyboard; together with the erection process of the locking operation, the voltage drawn by a voltage/current sensing component in the torque control device is combined Stored in a memory unit of the torque control device, and performs the verification and sampling average of the complex point and the complex array between the high and low voltages for establishing the voltage and torque of the electric impact type torque tool under normal operation. Correspondence curve. The torque control method of the electric impact type torque tool according to claim 2 or 3, further comprising the steps of: automatically repeating the locking torque between the high and low voltages or the plurality of points and the plurality of times according to the preset program. Verifying the operation to obtain the maximum torque value and the minimum torque value respectively corresponding to the highest working voltage of the complex array and the minimum operating voltage; accumulating and averaging the maximum torque value of the complex array, the minimum torque value The highest operating voltage and the minimum operating voltage are used to establish a corresponding relationship between the voltage and the torque according to the average calculated maximum torque value, the minimum torque value, the highest operating voltage, and the minimum operating voltage. The torque control method of the electric impact type torque tool according to claim 1, further comprising the following steps: when the difference between the actual torque value and the target torque value is too large, the torque revision key can be utilized; the microprocessor automatically according to the revised torque value Adjusting the corresponding relationship between the voltage and the torque, and simultaneously displaying the adjusted controllable torque range; when re-entering the target torque value, according to the adjusted relationship between the torque and the working voltage, obtaining an adjustment corresponding to the target The operating voltage of the torque value is driven by the electric shock type torque tool to achieve the target range. The torque control method of the electric impact type torque tool according to claim 1, further comprising the steps of: inputting a torque check value instead of the displayed torque value; replacing the original value in the voltage and torque corresponding relationship curve with the substitute torque value; The torque value is displayed, and the working voltage corresponding to the original torque value remains unchanged. When the target torque value is re-inputted, the electric shock type torque tool can be driven by the operating voltage according to the adjusted relationship between the torque and the working voltage. Perform a locking operation to obtain the desired target torque value. The torque control method of the electric impact type torque tool according to claim 6, further comprising the following steps: the torque check value does not match the target torque value, but when the control reproducibility is stable, the torque value of the relationship curve is modified. However, the curve remains unchanged. During the process of locking or torque verification, the voltage and pressure change of the tool is monitored throughout the process; when the voltage variation exceeds the allowable variation range, an alert is issued via a warning device, or the output is cut off to The power source of the electric impact type torque tool. A torque control system for an electric impact type torque tool, comprising a power supply module connected to a torque control device for driving an electric impact type torque tool and a torque sensing device built in or externally connected to the output end thereof for locking The torque control device comprises: a microprocessor, which is based on the torque or angle sensing signal of the torque sensing device and continuously transmitted back to the torque control device, and after the amplification operation, compares the relationship established by the pre-verification The curve obtains the working voltage corresponding to the target torque value, and performs the closed-loop torque control locking operation. During the process, the working voltage is stably controlled to a preset allowable variation range by continuously detecting the change of the voltage current and the temperature in real time. In order to control the locking torque, and within the range of the target torque value, the power source is cut off and a warning is issued; a voltage control module continuously detects the change of the voltage and current and the temperature, and stably controls the working voltage. Controlling the locking torque within a preset tolerance range; a voltage/current sensing component for detecting the operation The working voltage and current of the electric impact type torque tool are directly fed back to the microprocessor for reference of voltage or current control; a temperature sensing element is used for detecting the temperature rise of the electric impact type torque tool, Feedback to the microprocessor for voltage or current control reference; an input unit and an output unit for each torque setpoint, deformation sensed value, target torque value, and control related signal transmission; The unit is used to display the voltage and torque unit, the target torque value and the corresponding working voltage, the number of locks, and the locking operation; A warning unit is a warning for the operation and determination of the microprocessor, with a light or sound; a wired/wireless communication module that performs wired or wireless information transmission with the torque sensing device; and a memory unit, A maximum torque value and a minimum torque value obtained by using the electric impact type torque tool in a stable operating voltage range capable of maintaining a normal locking operation, and a minimum operating voltage and a minimum operating voltage. The operating condition; the torque sensing device is built-in or externally attached to the output end of the electric impact type torque tool, and includes a torque sensing unit, a circuit board module and a battery unit electrically connected, wherein the circuit The board module further includes a microprocessor, an amplifying circuit unit, an angle sensing unit, a memory unit, an output input unit, a charging circuit unit and a communication unit. The torque control system of the electric impact type torque tool according to claim 8, wherein the voltage control module is also a current control module, according to the highest working current and the normal working current of the electric impact type torque tool. The minimum working current drives the electric impact type torque tool and the torque sensing device respectively, and performs the locking torque verification operation before the locking operation; and correspondingly according to the highest working current and the minimum working current respectively. The maximum torque value and the minimum torque value establish a current-to-torque relationship curve; according to the current-torque correspondence curve, input a target torque value between the maximum torque value and the minimum torque value, Obtaining a corresponding working current, and driving the electric impact type torque tool and the torque sensing device built in or externally connected to the output end to perform the locking operation; and the torque sensing device during the locking process Immediately and continuously return to the sensing signal of the torque control device, controlled by torque After the microprocessor in the device is amplified, the corresponding operating current is obtained by comparing the pre-stored relationship curves in the memory unit, and the torque control of the closed loop is performed, and the microprocessor senses the voltage and current sensing components and the temperature. The component continuously detects changes in voltage, current and temperature, and then through the current control module, the operating current is stably controlled within a preset allowable variation range to control the locking torque and reach the target torque value. When the power source is cut off and a warning is issued. The torque control system of the electric impact type torque tool according to claim 8, wherein the microprocessor corrects and adjusts the current-torque correspondence curve according to the input revised torque value, and when the target torque value is re-entered According to the adjusted corresponding relationship between the current and the torque, the new corresponding working current is prompted, and the working current is used to drive the electric impact type torque tool to perform the locking operation to reach the target torque value.