JP7108332B1 - Bolt clamp force sensor for bolt lock operation - Google Patents

Abstract

A bolt clamping force sensor for bolt locking operation. When locking a helical bolted joint, driving a torque shaft in a clamping force sensor to generate an axial force generated by a helical mechanism at one end thereof, a strain sensing value caused by a squeezing force sensing module, and the clamping force generated by locking a helical bolt joint of a specific specification with a sleeve driven by the other end of the torque shaft, and the parameter relationship between the two obtained by verification in advance with a standard axial force meter, It is the basis for calculating and controlling the clamping force during the locking process. The clamping force sensor for helical bolted joints of the present invention is applicable to various industries. When performing locking work on a spiral bolted joint by mounting it on various torque tools, the precision for controlling the clamping force acting on the spiral bolted joint is required for a specific specification of the spiral bolted joint. It effectively senses and enhances the quality of the bolted joint. [Selection drawing] Fig. 2

Description

TECHNICAL FIELD The present invention relates to a bolt clamping force sensor for bolt locking operation, and more particularly to a device that applies to the process of locking spiral bolt joints, directly senses the clamping force acting on the spiral bolt joints, and transmits sensing data. .

The technology of tightening bolts with a torque wrench is widely applied to the assembly work of various products. Applying torque is a kind of means, the purpose of which is all to tighten the bolt. Locking each bolt with the same tightness is the most ideal, but at the same time the most difficult, especially in high pressure vessels, engine cylinders, or vacuum installations. Precisely controlling the clamping force of bolts to achieve locking is an important topic in the industry, but has always been difficult to achieve by controlling locking torque alone.

Conventional bolting processes convert only 10% of torque into clamping force. One popular designation is the "541" rule, which uses about 50% torque to overcome the frictional forces between the bolt head or nut and the mating surface during the bolt locking process, overcoming the frictional forces in the threads. Although about 40% of the torque is required for this purpose, only about 10% of the torque can actually be converted into the clamping force of the bolt. The magnitude of the final clamping force is further affected by various factors related to the helical bolt joint, such as the condition of the bolt and the member to be fastened (hardness of the material, processing accuracy, surface roughness, oil stains, rust It has become difficult to control the pre-fastening force of the bolt due to the influence of the degree of attachment, scratches, etc.) and the hardness of the washer to be used. Many academic societies and engineer's handbooks relate to calculation formulas and calculation parameters of torque and clamping force, but it was difficult to obtain accurate verification from any of them. To date, no economically effective method has been found in the industry that requires control of fastening force. Generating the force and effectively controlling it was even more difficult. This represents a large potential quality risk and uncertainty for precision assembly operations requiring uniform clamping force control.

In addition, until today, various torque controllers have been universally used in the industry, and lock torque is controlled by torque tools such as digital display type torque wrenches, voice type torque wrenches, or electric servo control. . For example, when using the conventional torque control method to apply the same torque to fasten bolts of the same specification, the only difference is the surface condition of the thread. There are oil stains, rust, scratches on the thread, or only the hardness of the washer has been modified. This indicates that all torque control accuracies are within 5%, but it has been proven that the difference from the actual clamping force value measured by experiments reaches a maximum of nearly 50%. .

At present, the most accurate method for controlling the tightening force of bolts is to use a bolt tension detector using ultrasonic sensing technology, but this has been difficult to spread due to high manufacturing and installation costs. In addition, the sensing bolt that senses the clamping force of the bolt (a deformation sensing element is attached to the appropriate position of the bolt axis to detect the clamping force) is also expensive and can only be used for locking with an open wrench. It was inconvenient for construction, low efficiency, and difficult to spread. In the control and detection of bolt tightening force, a bolt pressure transducer or a center-hole type compression load cell is additionally used, or an axial force sensing device such as a piezoelectric ring sensor is substituted. is doing. However, in practice, the high manufacturing cost and the low usability of some of the above methods have been the main factors that have hindered their widespread use in the industry.

Therefore, the inventors of the present invention believed that the above drawbacks could be improved, and as a result of intensive studies, they came up with the proposal of the bolt clamping force sensor for bolt lock operation of the present invention, which rationally and effectively solves the problems. In other words, the present invention can be applied to fastening work of various torque tools, immediately obtain the magnitude of the clamping force generated by the torque applied to the helical bolted joint, and then communicate with the controller or controller by wire or wireless method. Transmit to the display device to display the results, record or upload the data, complying with the industrial development trend of Industry 4.0. The clamping force sensor of the helical bolted joint of the present invention has the advantages of effectively improving the fastening accuracy, low cost of use and convenient operation, which greatly promotes the effective use in industry.

The present invention has been made in view of such conventional problems. In order to solve the above problems, an object of the present invention is to provide a bolt clamping force sensor for bolt lock operation. In short, a device that directly measures the clamping force acting on a helical bolted joint during locking of the helical bolted joint can be added to any conventional manual, pneumatic, or electric Torque Wrench or Screwdriver. It is a clamp force sensor (Force Transducer). The clamping force sensor for bolting operations according to the present invention converts a torque tool into a clamping force wrench or force screwdriver with direct control of the clamping force. The locking process provides immediate sensing of the clamping force acting on the helical bolted joint. This is a major revolution in helical bolt joint locking technology, a breakthrough, and an overturn of conventional lock torque control technology means. Also, there is no need to control the clamping force of the helical bolted joint by ultrasonic and axial force sensing techniques, which are expensive and inconvenient to operate. The clamping force sensor for bolting work according to the present invention maximizes the locking technology of helical bolted joints, directly controls the clamping force of helical bolted joints unlike the conventional torque control, and is used in the industry. provide an optimal solution for locking bolted joints.

The main invention for achieving the above object is
One end is a torque tool receiving part, which conforms to the size of the output end of the torque tool, the other end forms a screw hole with a spiral guide groove, and the bottom of the screw hole accommodates the force sensing module and a sensor body screwed into a corresponding helical guide groove of the torque shaft;
It comprises a sensing ring body and a force sensing element, the sensing ring body has a ring groove on its outer edge, and the force sensing element is attached to the bottom of the ring groove to measure the strain value in the axial direction of the sensing ring body. a force sensing module sensing and electrically coupled to the signal processing module;
a dust plug installed between the sensing module and the torque shaft and having a seal ring to prevent foreign objects from entering the force sensing module;
One end of the shaft diameter has a plurality of helical spiral guide grooves corresponding to the threaded holes of the sensor body, and the other end is sized to the input end of the sleeve to lock a specific specification of helical bolted joint. a torque shaft forming a matching drive head;
a plurality of steel balls inserted between the helical guide groove of the sensor body and the helical guide groove of the torque shaft so as to reduce frictional resistance during rotation;
installed inside or outside the sensor body, and has a signal amplifier, a microprocessor, a power supply circuit unit, a signal transmission unit, an input/output module, a gyro, a memory unit, a communication antenna, and a warning unit; and the signal amplifier amplifies the sensing signal transmitted from the force sensing module to the signal processing module through the connection line, and the microprocessor calculates using the pre-correction parameter to obtain the corresponding clamping force value, and the power supply circuit The unit converts the power supplied from the outside into the power required by the power module, and the signal transmission unit is wireless such as Radio Frequency, Bluetooth (registered trademark), Wi-Fi (registered trademark) or ZigBee (registered trademark) or wired For example, RS232, RS485, or UART (universal asynchronous transmission/reception module) is transmitted to the control device or display device, and the input/output module is USB (Universal Serial Bus) for battery charging and firmware update. The gyro is used to detect the change in rotation angle of the bolt clamping force sensor, and the memory unit verifies and acquires the strain sensing value of each locking spiral bolt joint and force sensing module with a standard axial force meter. The warning unit is a buzzer or LED (Light Emitting Diode) light, and a signal processing module that displays signal strength, power status, or usage status,
a power module that is a rechargeable battery and is electrically connected to the signal processing module;
a fixture that locks onto the sensor body and pre-covers the signal processing module and power module with a protective sleeve;
a protective sleeve for protecting the signal processing module and the power module, which is manufactured from a material that does not interfere with the transmission of wireless signals;
a connection line electrically connecting the force sensing element of the force sensing module and the signal processing module;
and a fixing ring supporting the torque shaft so as to slide in the screw hole of the sensor body so as not to fall off.

As a result, when torque is applied to the clamping force sensor of the present invention, the torque shaft in the clamping force sensor is driven, and the spiral guide groove at one end rotates along the spiral guide groove in the screw hole of the sensor body. Axial force generated by moving forward while moving forward, strain sensing value generated by compressing the force sensing module at the bottom of the screw hole, sleeve driven by the other end of the torque shaft, helical bolt joint with specific specifications The clamping force generated by locking and the parameter relationship between the two obtained by verification in advance with a standard axial force meter are used as the basis for calculating and controlling the clamping force during the locking process. The specific specifications of the helical bolted joint include the size of the bolt to be locked, the size of the thread pitch, the surface condition (for example, size processing accuracy, roughness, or lubrication), and the hardness of the washer to be used. point to With this parameter relationship, the operator uses the clamp force sensor of the present invention to pair with the control device or display device, and then the specifications of the spiral bolt joint to be tightened (bolt strength class, thread pitch, effective diameter, etc.) , washer hardness, and desired lock target clamping force. Then, the torque is applied to drive the clamping force sensor of the present invention, and in the locking process, the strain sensing value of the force sensing module received by the signal processing module and the helical bolt joint are verified in advance. Based on the parameter relationship, the corresponding clamping force value is calculated on the fly and simultaneously transmitted to the controller or display device by wire or wirelessly. When the lock reaches the target clamping force, the control device immediately cuts off the power source of the torque tool, or the display device indicates to the operator by voice or light to stop applying the torque, and the helical bolt joint It is the basis for sensing and controlling the clamping force.

Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

FIG. 2 is a combined cross-sectional schematic view of a bolt clamp force sensor according to one embodiment of the present invention; 1 is an exploded view schematically showing a bolt clamping force sensor according to an embodiment of the present invention; FIG. 1 is a schematic external view of a combined bolt clamp force sensor according to an embodiment of the present invention; FIG. 1 is an application schematic diagram (1) of a bolt clamping force sensor according to an embodiment of the present invention; FIG. FIG. 2 is an application schematic diagram (2) of the bolt clamping force sensor according to an embodiment of the present invention; Figure 4B is an exploded schematic view of Figure 4B; FIG. 1 is a schematic lead angle diagram (1) showing a bolt clamping force sensor according to an embodiment of the present invention; FIG. 2 is a schematic view (2) of a lead angle showing a bolt clamping force sensor according to an embodiment of the present invention; FIG. 4 is a combined cross-sectional schematic view of a bolt clamping force sensor tightening a helical bolted joint according to an embodiment of the present invention; FIG. 4 is a schematic external view of a combination of a bolt clamping force sensor tightening a helical bolted joint according to an embodiment of the present invention; FIG. 4 is a schematic diagram of clamping force and thrust calculations associated with a bolt clamping force sensor according to an embodiment of the present invention; FIG. 4 is a partial schematic diagram of a bolt clamp force sensor parameter verification structure according to an embodiment of the present invention; 1 is a general schematic diagram of a parameter verification structure for a bolt clamp force sensor according to an embodiment of the present invention; FIG. FIG. 4 is a schematic diagram of various torque tools applied to the bolt clamping force sensor according to one embodiment of the present invention; FIG. 4 is an application operating system diagram of a bolt clamp force sensor according to an embodiment of the present invention;

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the embodiments described below do not limit the content of the present invention described in the claims. Moreover, not all the configurations described below are essential requirements of the present invention.

The present invention will now be described in more detail with reference to FIGS. 1-10. 1 to 3, 6A and 6B, 7A to 7C, 8A and 8B, the clamping force sensor 1 of the present invention comprises a sensor body 11, a force sensing module 16 and dust. It comprises a plug 15, a torque shaft 13, a steel ball 14, a signal processing module 20, a power module 21, a cushion 12, fixing bases 181, 182, protective sleeves 191, 192, and a fixing ring 17. ing. One end of the sensor body 11 is a torque tool receiving portion 111 for matching the size of the output end of the torque tool, and the other end of the sensor body 11 is a helical guide groove 132 for screwing into the helical guide groove 132 of the torque shaft 13 . A threaded hole 112 having a guide groove 1121 is sewn. The force sensing module 16 is installed at the bottom of the screw hole 112 of the sensor body 11, the force sensing module 16 has a sensing ring body 161 and a force sensing element 162, and has a ring groove 163 on the outer edge of the sensing ring body 161. ing. The force sensing element 162 is attached to the bottom of the ring groove 163 to measure the strain sensing value generated by the axial force received by the sensing ring body 161 and generate a deformation sensing signal. It is electrically connected to the processing module 20 . The sensing ring body 161 is fixed by a mechanism to prevent the sensing ring body 161 from rotating or falling off. Also, the force sensing module 16 is manufactured with various sensing elements capable of sensing an axial force, such as a strain gauge or piezoelectric. The dust plug 15 is installed between the force sensing module 16 and the torque shaft 13 and has a sealing ring 151 that prevents foreign matter from entering the force sensing module 16 . One end of the torque shaft 13 is a helical guide groove 132 formed along its axial diameter. When subjected to torque, in the process of axially sliding along the spiral guide groove 1121 in the screw hole 112 of the sensor body 11, the frictional resistance during rotation is effectively reduced. The generated axial thrust acts on the end face of the dust plug 15 and the end face of the force sensing module 16 . The output end 131 at the other end of the torque shaft 13 is formed in a size suitable for the input end of the sleeve 10 (see FIG. 8B). It is fixed in the ring groove at the outlet end of the screw hole 112, and the torque shaft 13 is slid in the screw hole 112 of the sensor body 11 so as not to fall off. The fixed bases 181 , 182 lock into the cushion socket 113 of the sensor body 11 using the cushion 12 and accommodate the signal processing module 20 and the power module 21 . The signal processing module 20 includes a microprocessor, a signal amplifier, a pairing key switch, a power circuit unit, a signal transmission unit, a gyro, a memory unit, an input/output module, a communication antenna, and a warning unit. and electrically connected to the force sensing element 162 . The signal amplifier of the signal processing module 20 receives and amplifies the sensing signal transmitted from the force sensing element 162, converts it into a digital signal, and calculates the corresponding clamping force value by calculating the pre-verified parameters by the microprocessor. It is calculated and transmitted to a control device or a display device by an input/output module and a communication antenna. The signal processing module 20 is covered with an elastic material and installed on a fixed base 181 . The power supply circuit unit converts power supplied from the outside into power required for the power module 21 . The gyro detects the change in the rotation angle of the sensor body 11, and the memory unit verifies the strain sensing values for the locking spiral bolt joint 8 and the force sensing module 16, and outputs them to the standard axial force meter 9 (see FIG. 8B). ) and store the clamping force parameters obtained by verification. In addition, the verified parameters are stored in the memory unit of the control device or the display device, and the operating personnel can input the specifications of the spiral bolt joint to be locked after starting and pairing to facilitate the acquisition of the corresponding parameters. In addition, if there is a difference between the specifications of the spiral bolted joint used and the washer used in the verification, the measured data will be corrected by the program. The power module 21 is a rechargeable battery, covered with elastic material, installed on the fixed base 182 and electrically connected to the signal processing module 20 . The protective sleeves 191 and 192 are made of a material that does not interfere with the transmission of wireless signals, cover the signal processing module 20 and the power module 21 on the fixed base, and protect the signal processing module 20 and the power module 21 . The signal transmission unit can be a wireless communication module, such as Radio Frequency, Bluetooth, Wi-Fi, ZigBee, etc., or a wired one, such as RS232, RS485, UART (Universal Asynchronous Transceiver Module). ), etc. The input/output module is a USB (Universal Serial Bus) used for charging the battery and updating the firmware. The warning unit is a buzzer or LED (Light Emitting Diode) light that displays signal strength, power status, usage status, etc., and the connection line is electrically connected to the force sensing element 162 of the force sensing module 16 and the signal processing module 20. is doing.

Before using the clamping force sensor 1 of the present invention, the operator must lock the clamping force sensor 1 and the locking helical bolt joint 8 to a standard axial force meter 9 in advance to verify the strain of the force sensing module 16. It is necessary to establish a clamping force parametric relationship between sensed values and said specific specification of helical bolted joint. Also, the generation of clamping force and the strain sensing value of the force sensing module 16 are in a linear relationship, which makes the control of the clamping force easier and more precise. In addition, if there is no standard axial force meter to verify a helical bolted joint that requires locking, or if locking is performed by setting a target torque according to conventional practice, it is displayed when locking until the target torque is reached. By taking the clamping force value as a reference target value for controlling the clamping force of subsequent helical bolted joints of similar specifications, the goal of uniform clamping force control is achieved.

When performing locking work using the clamping force sensor 1 of the present invention, the operator pairs the clamping force sensor 1 and the control device or display device, then the specification of the spiral bolt joint 8 to be tightened, the target clamp A force, control accuracy, etc. are input, and torque is applied to the clamping force sensor 1 by a torque tool to lock the helical bolt joint 8 . In the locking process, one end of the torque shaft 13 of the clamping force sensor 1 is axially moved relative to the dust plug 15 by the spiral mechanism formed by the spiral guide groove 132 and the spiral guide groove 1121 of the screw hole 112 of the sensor body 11 . A thrust force is generated to squeeze the end face of the force sensing module 16, causing the force sensing module 16 to deform, while the other end of the torque shaft 13 locks the helical bolt joint 8 to generate a clamping force. The strain sensing value generated by the clamping force and force sensing module 16 and the locking helical bolt joint 8 have a certain parametric relationship. The signal processing module 20 then determines the helical bolt joint 8 based on the previously verified and obtained strain sensing value of the force sensing module 16 and the parameter relationship of the clamping force corresponding to the helical bolt joint 8 of the specific specification. Calculate the clamping force acting on When the target clamping force is reached, the control device of the torque tool cuts off the power source, or the display device stops the operation by displaying voice or light to the operator, and judges whether the operation is successful or not. When the urging torque disappears, the torque shaft 13 will have a high thread pitch and lead angle due to the rigid elastic recovery force of the sensing ring body 161 and the dust plug 15, and the multiple helical design of the torque shaft 13. The elastic recovery resistance force is reduced to a minimum, the torque shaft 13 is recovered to the unforced state, and the strain sensing value of the force sensing module 16 is set to zero.

Furthermore, when the clamping force sensor 1 of the present invention is used in a power fastening tool such as a pneumatic, electric or hydraulic power fastening tool, the locking speed of the tool is reduced using the tool control mechanism before locking to the target clamping force. and then modified to an intermittent tap and gradually locked until the target clamping force is reached. This effectively improves the control accuracy of the clamping force.

4A and 4B, 5, 6A and 6B, 8A and 8B, the clamping force sensor 1 of the present invention has a steering gear 23, 24 in a self-contained manner. It is applied to torque tools. The output end of the torque tool motor reduction mechanism is inserted into the torque tool receiving part 111 of the sensor body 11 of the clamping force sensor 1 . When torque is applied to the clamping force sensor 1, the output end 131 of the torque shaft 13 of the clamping force sensor 1 passes through the bearing 22 and is inserted into the steering gear 23 to engage the other steering gear 24 that is engaged. The output shaft 25 of the steering gear 24 passes through another bearing 26 and is fixed by a fixing ring 27. The output shaft 25 is inserted into the sleeve 10 and the helical bolt joint 8 is locked. The spiral bolted joint 8 includes a bolt 81 , a washer 82 , a locked member 84 and a nut 83 . The principles of FIGS. 4A, 4B, and 5 are the same as those of FIGS. 1-3, all of which apply torque to the clamping force sensor 1 while simultaneously adjusting the thread pitch on both ends of the torque shaft 13. drive different spiral mechanisms, the axial thrust force F _SW generated by the spiral guide groove 132 against the force sensing module 16 along the spiral guide groove 1121 of the sensor body 11 , and the strain sensing value generated by the other end The clamping force F _B&W exerted on the locked helical bolted joint 8 (see FIGS. 6A and 6B) can be obtained by prior verification with a standard axial force meter 9 (see FIGS. 8A and 8B) to obtain the strain sensing establish the corresponding axial thrust F _SW and clamping force F _B&W parametric relationships. Said parameter relationships are then used as the basis for sensing and controlling the clamping force of the helical bolted joint 8 .

Next, referring to FIGS. 6A and 6B, FIGS. 7A to 7C, FIGS. 6A and 6B, the spiral guide groove 132 of the torque shaft 13 and the spiral guide groove 1121 in the screw hole 112 of the sensor body 11 forms a thread with an effective diameter of 46 mm, a thread pitch of 50 mm, a spiral number of 5, and a calculated lead angle of 59.97°. , the thread pitch is 2mm, and the single helix lead angle is 2.03°. As shown in FIGS. 7A-7C, a torque of 500 Nm is applied to the clamping force sensor 1, causing the torque shaft 13 to tighten the M20 helical bolted joint 8 and generate a clamping force F _B&W of 188,496 N. , the spiral guide groove 132 of 5 spirals at the other end generates an axial thrust F against the dust plug 15 and the force sensing module 16 along the spiral guide groove 1121 in the screw hole 112 of the sensor body 11 . _SW is 11,938N. In addition, the deformation caused by compressing the dust plug 15 and the sensing ring main body 161 by the 628.32 N axial thrust force F _SW is all designed within the yield strength range of the dust plug 15 and the sensing ring main body 161 . Efficiency η used when calculating the thrust from the above torque is an estimated value, and conversion of both the deformation value of the force sensing module and the clamping force acting on the spiral bolt joint 8 measured by the standard axial force meter 9 It does not affect the actual validation of the parameters. In addition, as shown in FIGS. 6A and 6B, the lead angle of the spiral guide groove 132 of the torque shaft 13 is designed to be 59.97°, which is larger than the friction angle (in the example of the present invention, the helical The guide groove 1121 and the spiral guide groove 132 of the torque shaft 13 form a spiral number of 5, which increases the thread pitch, increases the lead angle, and effectively reduces the axial force acting on the force sensing module 16. A plurality of steel balls 14 and lubricating oil are filled in the spiral guide groove to reduce the frictional resistance of the spiral mechanism to the minimum, similar to the design of the ball screw, with a friction coefficient f of 0.1. and set f = 0.1 = tan(θ) to calculate θ = 5.7 degrees, the equivalent friction angle of the helix is equal to 5.7 degrees, ie the self-locking angle is equal to 5.7 degrees). Therefore, when the lead angle of the torque shaft 13 is much larger than the friction angle of 5.7 degrees and the torque is released, the rigid elastic restoring force of both the dust plug 15 and the force sensing module 16 will easily cause the torque shaft 13 to reverse. can be loosened by pressing the force sensing module 16 to zero.

As shown in FIGS. 8A and 8B, by installing the structure associated with parameter verification, applying torque to the clamping force sensor 1 of the present invention with a torque tool, and adding a sleeve 10, bolts of a particular specification 81 and washer 82 (helical bolt joint 8) are passed through the shaft hole of the standard axial force meter 9, screwed into the test table 90, and then locked with a nut 83. For verification, the strain sensing value generated by the force sensing module 16 of the clamping force sensor 1 upon receiving the axial thrust generated by the helical mechanism is amplified by the signal processing module 20 into a digital sensing signal. A signal transmission unit transmits to a control device or a display device. The locked helical bolted joint 8 also synchronously transmits the clamping force measured by the standard axial force meter 9 to a controller or display to establish a parametric relationship between the clamping force and the strain sensed value. Further, when the specifications of the bolt 81, washer 82, nut 83, etc. of the spiral bolted joint 8 are changed, parameter verification is performed again.

As shown in FIG. 9, the clamping force sensor 1 of the present invention is applied to various conventional torque tools, and the clamping force sensor 1 is attached to the output end of the torque tool, (See Fig. 5). After verifying the parameters in advance for the helical bolt joint to be locked, and pairing and connecting an appropriate control device or display device, the clamping force sensor 1 drives the sleeve to drive the helical bolt joint. During the locking process, the clamping force acting on the helical bolted joint is immediately measured, allowing all torque tools to precisely control the clamping force.

As shown in FIG. 10, when the clamping force sensor 1 of the present invention is driven by FIG. 9 or any one type of torque tool to lock a helical bolted joint, after pairing with a controller or display device, Enter the helical bolted joint specifications and target clamping force. In the locking process, the signal processing module continuously calculates the strain sensing value and immediately transmits the obtained clamping force to the control device or display device of the torque tool by wire or wireless method. When the target clamping force is reached, whether to judge pass/fail and display a warning sound or light. Or disconnect the power source and upload the relevant data to a nearby server or cloud database as needed. Also, if the strain sensing value or clamping force exceeds a predetermined value, the torque tool controller or display device will generate and record a warning signal.

Accordingly, the embodiments disclosed herein are intended to be illustrative rather than limiting, and the spirit and scope of the invention is not limited by such embodiments. The scope of the present invention should be construed according to the scope of the claims, and all techniques that come within the scope of equivalents thereof should be considered within the scope of the present invention.

Reference Signs List 1 clamping force sensor 11 sensor body 111 torque tool receiving portion 112 screw hole 1121 spiral guide groove 113 cushion socket 12 cushion 13 torque shaft 131 output end 132 spiral guide groove 14 steel ball 15 dust plug 151 seal ring 16 force sensing module 161 Sensing ring body 162 force sensing element 163 ring groove 17 fixing ring 181 fixing base 182 fixing base 191 protective sleeve 192 protective sleeve 20 signal processing module 21 power module 22 bearing 23 steering gear 24 steering gear 25 output shaft 26 bearing 27 fixing ring 8 spiral shaped bolt joint 81 bolt 82 washer 83 nut 84 member to be locked 9 standard axial force gauge 10 sleeve 90 test stand

Claims (11)

one end is a torque tool receiving part, the other end forms a hole with a spiral guide groove, the bottom of the hole accommodates a force sensing module; and a sensor body screwed into a corresponding helical guide groove of the torque shaft;
It comprises a sensing ring body and a force sensing element, the sensing ring body has a ring groove on its outer edge, and the force sensing element is attached to the bottom of the ring groove to measure the strain value in the axial direction of the sensing ring body. a force sensing module sensing and electrically coupled to the signal processing module;
a dust plug installed between the force sensing module and the torque shaft and having a seal ring to prevent foreign objects from entering the force sensing module;
One end of the shaft diameter has a plurality of helical spiral guide grooves corresponding in the hole of the sensor body, and the other end is adapted to the size of the input end of the sleeve so as to lock the bolted joint of specific specifications. a torque shaft forming a drive head;
a plurality of steel balls inserted between the helical guide groove of the sensor body and the helical guide groove of the torque shaft so as to reduce frictional resistance during rotation;
A bolt clamp force sensor for bolt lock operation, characterized by comprising : installed inside or outside the sensor body, and has a signal amplifier, a microprocessor, a power circuit unit, a signal transmission unit, an input/output module, a gyro, a memory unit, a communication antenna, and a warning unit; and the signal amplifier amplifies the sensing signal transmitted from the force sensing module to the signal processing module through the connection line, and the microprocessor calculates using the pre-correction parameter to obtain the corresponding clamping force value, and the power supply circuit The unit converts the power supplied from the outside into the power required by the power module, the signal transmission unit transmits wirelessly or by wire to the control device or display device, the input/output module is a USB (Universal Serial Bus), and the battery The gyro is used to detect the change in the rotation angle of the bolt clamp force sensor, and the memory unit is used to verify and acquire the distortion of each bolt joint and force sensing module that locks. The parameter relationship obtained by verifying the sensing value with a standard axial force meter is stored, and the warning unit is a buzzer or LED (Light Emitting Diode) light. a module;
a power module that is a rechargeable battery and is electrically connected to the signal processing module;
a fixture that locks onto the sensor body and pre-covers the signal processing module and power module with a protective sleeve;
a protective sleeve for protecting the signal processing module and the power module, manufactured from a material that does not interfere with wireless signal transmission;
connection lines electrically connecting the force sensing elements of the force sensing module and the signal processing module;
a retaining ring supporting the torque shaft so that it slides against falling out within the hole in the sensor body.
The bolt clamping force sensor for bolt locking operation according to claim 1, characterized by: The helical guide groove of the sensor body and the helical guide groove of the torque shaft each have the same number of spiral turns and are the same as the helical direction of the locking bolt joint . 2. A bolt clamping force sensor for bolt lock operation according to 1. The lead angle of the helical guide groove of the torque shaft is greater than the friction angle, and the thrust of the torque shaft acting in the axial direction of the dust plug and the sensing ring body is all caused by the torque shaft, the dust plug and the sensing. When the torque is released within the yield strength range of the ring body, the elastic recovery force of the sensing ring body and the dust plug causes the torque shaft to reverse and restore along the helical guide groove, so that the force sensing module senses 2. The bolt clamping force sensor for bolt locking operation according to claim 1, wherein the value is set to 0. The signal processing module transmits the clamping force obtained by calculating the strain sensing value to the control device or display device of the torque tool in a wired or wireless manner, thereby controlling the clamping force of the bolted joint and the strain 3. The bolt for bolt locking operation according to claim 2 , wherein when the sensing value or the clamping force exceeds a predetermined value, the control device or the display device of the torque tool outputs and records a warning signal. clamp force sensor. The bolt clamping force sensor for bolt locking operation of claim 1, wherein the force sensing module senses an axial force. In the process of applying torque to the torque shaft, the upper and lower two spiral mechanisms rotating coaxially lock the bolt joint of a specific specification at the lower end, and at the same time, the pressure force sensing module of the spiral mechanism at the other end preliminarily The bolt clamping force sensor for bolt locking operation according to claim 2 , wherein the clamping force acting on the bolted joint at that time is calculated and acquired by the signal processing module based on the clamping force conversion parameter established by verification. . The parameters used in microprocessor calculations are the strain sensing of the force sensing module of the bolt clamping force sensor when torque is applied to the bolt clamping force sensor to lock a specific specification bolted joint and standard axial force gauge. values and parameters scaled by the clamping forces acting on bolted joints of said specific specification and simultaneously storing them in the memory unit of the signal processing module or in a paired control or display device. The bolt clamping force sensor for bolt locking operation according to claim 7 . All bolted joints re-verify the clamping force conversion parameters if any one of the contents is modified, and the contents are bolt specifications, washers , or locking items. Bolt clamping force sensor for bolt locking operation as described. The signal processing module transmits the clamping force obtained by calculating the strain sensing value to a control device or display device of the torque tool by wire or wireless method, thereby controlling the clamping force of the bolt and the strain sensing value. 3. The bolt clamping force sensor for bolt locking operation according to claim 2 , wherein the controller or the display device issues and records a warning signal when the clamping force exceeds a predetermined value. The bolt clamping force sensor is externally attached to or built into the torque tool, thereby converting it into a clamping force wrench or clamping force driver that directly senses the clamping force acting on the bolted joint , and the torque tool is a conventional torque wrench or torque screwdriver. The bolt clamping force sensor for bolt locking operation according to claim 1, characterized in that:

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