JP2007245019A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector which detects cloggings of a filter accurately, and removes automatically dust attached to the filter to ensure a high dust deposited capability always. <P>SOLUTION: The dust collector comprises an inlet system, a tank storing the dust, a filter device, a dust removing device dropping down powder dust deposited to the filter, an operation control means, an operation detecting means, a signal converting means, and a control circuit provided with a means carrying out a comparative operation of previously memorized values and conditions of input and output. In the dust collector, a clogging pressure setting means is provided, the means setting the clogging threshold pressure changeable even when the inlet system is in operation. When the operation detecting means detects the stop of the inlet system, a clogging state of the filter is detected with the signal from the signal converting means immediately before the inlet system stops, and the signal from the clogging pressure setting means. When the filter remains clogged, the dust removing device is operated by the operation control means to remove the dust of the filter device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to power tools for cutting wood such as circular saws and jigsaws, power tools used for drilling, cutting, and polishing in concrete and stone materials such as hammer drills and stone cutters. The present invention relates to a dust collector for collecting dust from a hose connected to a dust collecting mechanism provided in the head or for cleaning cutting dust and powder to be ground in a work place.

  A conventional dust collector will be described with reference to FIGS.

  The dust collector 1 shown in FIG. 4 is a floor of a workplace where a power tool for cutting wood such as a circular saw or a jigsaw, or a power tool used for drilling, cutting, polishing, etc. in concrete or stone such as a hammer drill or a stone cutter is used. It is for cleaning etc.

  A hose 42 is connected to the suction port 3 of the dust collector 1, and a hose connection handle 43 is attached to the tip of the hose 42. Usually, an operator performs a cleaning operation with the hose connection handle 43. Two extension pipes 44 are connected to the tip of the hose connection handle 43, and a floor suction port 45 is connected to the tip.

  Thus, the dust on the floor is sucked together with the surrounding air from the floor suction port 45 and is sucked into the dust collector 1 from the suction port 3 via the two extension pipes 44, the hose connection handle 43 and the hose 42. In order to use the dust collector 1 having such a structure, an operation switch (not shown) is operated to operate the dust collector 1, and the hose connection handle 43 is used to suck and collect dust on the floor or the like of the workplace. . In this case, the operator often operates near the dust collector 1, and the hose 42 is often a thick and short hose having a diameter of about 38 mm and a length of about 2.5 m.

  On the other hand, the dust collector 1 shown in FIG. 5 is a cutting dust from a power tool for cutting wood such as a circular saw or a jigsaw, or a power tool used for drilling, cutting, or polishing in concrete or stone such as a hammer drill or stone cutter. The dust is sucked directly and collected.

  A hose 42 is connected to the suction port 3 of the dust collector 1, and the tip of the hose 42 is connected to a dust collection mechanism of the electric tool 47 via a dedicated suction port 46 for the electric tool. Then, it is sucked into the dust collector 1 from the suction port 3 through the hose 42 from the dedicated suction port 46 for the electric tool.

  When using the dust collector 1 having such a structure, the operator often operates the power tool 47 at the same time to process the dust collector 1 and is often away from the dust collector 1. For this reason, a thin and long hose 42 having a diameter of about 25 mm and a length of 3 m or more is often used. This is because the operation of the electric tool 47 may be hindered if the hose 42 is thick and short.

  In such a dust collector 1, an outlet is provided on the operation panel or the like of the dust collector 1, and when the power tool 47 is operated by receiving power supply from the outlet, the dust collector 1 automatically enters an operating state. When the operation is stopped, there is a case in which a function of an interlocking operation mode in which the dust collector 1 is automatically stopped after the dust collector 1 is operated for several seconds. And the dust collector 1 provided with the interlocking operation mode often has a function of performing the same operation as the dust collector 1 shown in FIG. 4 by switching the dust collector 1 between the operating state and the stopped state by an operation switch. At this time, the operation mode in which the dust collector 1 is operated by switching between the operation state and the stop state by the operation switch is called a single-action operation mode, and is distinguished from the interlock operation mode.

  Cutting dust such as wood, stone, concrete, gypsum board, etc., mainly collected by the dust collector 1 shown in FIGS. 4 and 5 is often fine and separates air containing dust into dust and clean air. The filter is prone to clogging. For this reason, conventionally, dust collectors equipped with a dust removal mechanism that removes the dust adhering to the filter have been proposed and put into practical use. Such dust collectors are used in the field of cutting work such as wood, stone, concrete, and gypsum board. It is used.

Such a dust collector has an operation arm that operates a dust removal mechanism in the exterior part, and when a filter is clogged, there is a manual type in which an operator operates the operation arm to remove dust (for example, Patent Document 1). reference). Further, the pressure inside the filter is converted into an electric signal, the electric signal is compared with a preset threshold signal, and the dust removing device is automatically operated only when the preset threshold signal is larger than the converted electric signal. There is an automatic dust collector (see, for example, Patent Document 2).
JP-A-9-000843 JP 60-212140 A

  The conventional manual dust collector that manually removes dust has a drawback in that it is troublesome because the operator must operate the operation arm to remove the dust every time the filter is clogged. In addition, there is often no means for operators to recognize filter clogging, and the clogging of the filter deteriorates, depending on experience or when the suction force becomes weak and the filter becomes clogged. In some cases, the dust removal operation is performed after that, and the dust collector is used in a state where the dust collection capability is not sufficiently exhibited.

  Further, the pressure inside the filter is converted into an electric signal, the electric signal is compared with a preset threshold signal, and the dust removing device is automatically operated only when the preset threshold signal is larger than the converted electric signal. In a dust collector, in an environment where a plurality of devices such as a dust collector and other power tools are often operated simultaneously by the power source of the same wiring path, the voltage drop due to the intake device operation of the dust collector or the power tool used together The capacity of the dust collector's intake system deteriorates due to voltage drop due to the operation of the filter, and even if the filter becomes clogged, the pressure inside the filter does not drop, so clogging of the filter cannot be detected, and the filter is clogged. In some cases, the dust collector was used as it was.

  Also, in the method of detecting the clogging of the filter by detecting the pressure inside the filter, in the dust collector for cleaning the floor of the workplace and the dust collector that directly collects the cutting dust of the electric tool and collects the suction mouth Due to the difference in air path resistance, there is a large difference in the internal pressure of the filter at the time of clogging.

  The present invention has been made in view of the above problems, and the object of the present invention is that even if the fine dust that cannot be completely separated by the filter enters the filter or the power supply situation deteriorates, An object of the present invention is to provide a dust collector capable of accurately detecting clogging and automatically removing dust adhering to a filter to always ensure a high dust collecting ability.

In order to achieve the above object, an invention according to claim 1 is a suction device for sucking dust;
A tank having a suction port and storing dust sucked by the suction device;
A filter device provided between the main motor base on which the intake device is installed and the tank to separate dust and air;
A dust removing device provided inside the filter device for dropping dust adhering to the filter;
Operation control means for controlling the operation of the dust removing device;
An operation detecting means for detecting an operation state of the intake device;
Signal converting means for converting the pressure state inside the filter device into an electrical signal;
A control circuit having means for comparing / calculating input / output states and pre-stored values;
In a dust collector comprising:
Provided is a clogging pressure setting means for setting a clogging threshold pressure that can be changed even when the intake device is in an operating state, and immediately before the intake device stops when the operation detecting means detects the stop of the intake device. The filter from the signal converting means and the signal from the clogging pressure setting means detect the clogging state of the filter, and when the filter is clogged, the operation control means operates the dust removing device. The filter device is dust-removed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the operation control means stops the dust removing device after operating for a predetermined time.

  According to the first aspect of the present invention, since the user can set a clogging threshold pressure suitable for the use environment even when the intake device is in an operating state, fine dust that cannot be completely separated by the filter is contained in the filter. Filters can be accurately detected even when they enter the environment or power supply conditions deteriorate, and dust that adheres to the filter is automatically removed to ensure a high dust collection capacity at all times. can do.

  According to the second aspect of the present invention, since the dust removing device automatically stops after being operated for a predetermined time, it is possible to suppress wasteful power consumption.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side sectional view of a dust collector according to the present invention, FIG. 2 is a block diagram showing a configuration of a control device of the dust collector, and FIG. 3 is a diagram showing an example of a volume for setting a filter clogging threshold pressure. .
[Description of structure]
A dust collector 1 shown in FIG. 1 includes a cylindrical tank 2 for storing dust. A suction port 3 is opened in a side portion of the tank 2, and a main motor is placed in an upper opening portion of the tank 2. A main motor cover 5 and a head cover 6 integral with the base 4 are clamped, and an air intake device 7 is built in between the main motor base 4 and the main motor cover 5. The intake device 7 is composed of a suction fan 8 and a main motor 9 that rotationally drives the suction fan 8, and air sucked from an intake port 4a provided at a lower portion of the main motor base 4 is exhausted to an exhaust port 4b. An exhaust path for exhausting the air is constituted by a main motor base 4, a main motor cover 5 and a head cover 6.

  On the other hand, a filter housing 11 is sandwiched and fixed between the upper opening of the tank 2 and the main motor base 4. The filter housing 11 has a cylindrical shape that removes dust and allows only air to pass through. A filter 13 and a filter cover 12 that holds the filter 13 so as not to be crushed by an internal negative pressure are attached. The filter 13 and the filter cover 12 constitute a filter device 10.

  A dust remover base 15 is attached to the filter housing 11. The dust remover base 15 has a dust removal motor 16, a reduction gear device 17 coupled to the shaft of the dust removal motor 16, and the reduction gear device. A dust remover 18 coupled to the output shaft 17 and a dust cover 19 for preventing dust from entering the dust removal motor 16 are attached. The dust removal motor 16, the reduction gear device 17, the dust remover 18, and the dust cover are attached. Constitutes a dust removing device 14, and this dust removing device 14 is built in the filter device 10. Here, the dust remover 18 is driven to rotate by the dust removal motor 16 and strikes the filter 13 to perform a function of dropping dust attached to the filter 13.

  By the way, the vertical centers of the filter 13 and the filter cover 12 and the dust removing device 14 of the intake device 7 and the filter device 10 are substantially on the same line, and these are opposite to the mounting position of the suction port 3 from the center line of the tank 2. The operation panel 21, the control circuit 20, and the insulating transformer 40 are installed at a portion located above the suction port 3 of the main motor cover 5.

  Further, a pressure measurement end is located at a position on the suction port 3 of the main motor cover 5 in the vicinity of the control circuit 20 and away from the main flow path of the air sucked by the intake device 7. The pressure measuring end 22 is connected to a gauge pressure sensor 30 (see FIG. 2) installed in the control circuit 20 by a hose or piping. Thereby, the gauge pressure sensor 30 functions as a sensor that detects the internal pressure state of the filter device 10 as a difference from the atmospheric pressure. Here, since the control circuit 20 and the pressure measurement end 22 are arranged close to each other, they can be connected by a short hose or pipe, and the gauge pressure sensor 30 or a negative pressure detection circuit 35 described later (see FIG. 2). Can be implemented together with the control circuit 20.

4 and 5 is connected to the suction port 3, and an electric tool 47 with a dust collection mechanism and a floor suction port 45 are attached to the tip of the suction port 3, and wood, stone, concrete, etc. Cutting dust such as gypsum board and dust can be sucked together with air.
[Feature Description]
In FIG. 2, reference numeral 23 denotes a power plug. The power plug 23 drives an outlet 24 that supplies power to an electric tool 47 (see FIG. 5) that is operated in conjunction, the main motor 9, and the main motor 9. A main motor drive circuit 37 and an insulation transformer 40 are connected, and these are supplied with power from the power plug 23.

  A DC power source 41 is connected to the secondary side of the insulating transformer 40, a dust removal motor 16 that receives power supply from the DC power source 41, a dust removal motor drive circuit 38 that drives the dust removal motor 16, and a control circuit 20. Is isolated from the external power supply. Although not shown, the power control element of the main motor drive circuit 37 is electrically insulated by an optical insulating coupler called a phototriac or photocoupler. Further, the drive of the dust removal motor 16 is electrically insulated by the secondary side output of the insulation transformer 40, and the insulation transformer 40 is mounted at a position above the discharge path when water is sucked into the dust collector 1. Even if the dust removal motor 16 is submerged, it is possible to avoid electric shock due to the user's contact with the power supply voltage.

  The current of the outlet 24 is detected by the current detector 25, and the detected current is converted into a voltage that can be recognized by the microcomputer 39 by the outlet current detection circuit 33, and the voltage is converted into an analog signal input port Ain 1 of the microcomputer 39. And the operation state of the electric tool 47 connected to the outlet 24 is detected by the calculation of the microcomputer 39.

  By the way, the power tool 47 connected to the outlet 24 has been improved in functionality in recent years, and is often equipped with a DC power supply device. For this reason, the means for detecting the operating state of the electric tool 47 is not simply the crest value or average value of the current waveform detected by the current detector 25, but the distorted current input to the DC power supply device, It is desirable to have a function of distinguishing and recognizing the current of the series commutator motor that is the drive source of the electric tool 47.

  Contact information of the strong / weak / stop switch 26 is converted into a digital voltage that can be recognized by the micro computer 39 by the main switch strong / weak / stop detection circuit 31, and this digital voltage is converted into a digital signal input port P 00 of the microcomputer 39. And the operation state of the intake device 7 is detected by calculation of the microcomputer 39.

  The intake device 7 does not stop immediately due to inertia even when the power of the main motor 9 is turned off. For this reason, the calculation of the microcomputer 39 is performed when the time when the time of operating with the inertia of the intake device 7 set in advance elapses from the time when the power to the main motor 9 is turned off. A process is performed in which it is detected that the operation state has been stopped. This process is the same when the main motor 9 is stopped by outputting an OFF signal to the digital output port D1 of the microcomputer 39. The time during which the intake device 7 operates with inertia is approximately 10 seconds.

  The ON / OFF switch detection circuit 32 converts the ON / OFF state of the operation instruction switch of the interlock / single action switch 27 and the dust removal motor ON switch 28 into a signal that can be read by the digital input ports P02 and P03 of the microcomputer 39. When this is ON, a low level signal is output to the digital input ports P02 and P03 of the microcomputer 39, respectively.

  The interlock / single-action changeover switch 27 is connected to the outlet 24 and has means for detecting the operating state of the electric tool 47, and operates the intake device 7 when the electric tool 47 connected to the outlet 24 is in an operating state. In this state, when the power tool 47 changes from the operating state to the stopped state, the intake device 7 is continuously operated for a few seconds, and then the intake operation is performed in the interlocked operation mode, which is a means for stopping the intake device 7, and in the state of the operation switch. It is a switch for selecting two operation modes, a single-action operation mode, which is means for operating / stopping the device 7. Usually, when the common electrode and the normally open electrode are in the OFF state, the operation mode is linked, and when the common electrode and the normally open electrode are in the ON state, the operation mode is the single action mode.

  When the power tool 47 is not connected to the outlet 24 and the dust collection work is performed at the floor suction port 45 or the like, the interlock / single action switch 27 is turned on to operate the dust collector 1 in the single action mode.

  When the power tool 47 is changed from the operating state to the stopped state in the interlocked operation mode, the intake device 7 is stopped after the intake device 7 is continuously operated for a few seconds. This is because the long hose 42 is often used as described above during the combined operation, and dust is prevented from clogging the hose 42.

  The dust removal motor ON switch 28 is an operation switch for operating the dust removal device 14. When the user depresses the dust removal motor ON switch 28, the dust remover 14 is in an operating state for a predetermined number of seconds, and removes the filter 13. However, the dust removal motor ON switch 28 is effective only when the processing function of the microcomputer 39 detects that the operation state of the intake device 7 is stopped, and the operation state of the intake device 7 is stopped. When the user does not detect this, even if the user depresses the dust removal motor ON switch 28, it is ignored and the dust removal device 14 does not operate. This is because even if the dust removing device 14 is operated while the intake device 7 is operating and rotating with inertia, dust attached to the filter 13 cannot be removed under negative pressure. This is to avoid wasteful power consumption and damage to the filter 13 due to the ineffective operation of the dust removing device 14 by not operating 14.

  The warning lamp 29 is an indicator lamp that is turned on when the processing function of the microcomputer 39 detects a clogged state of the filter 13. When the clogging state of the filter 13 is detected, the processing function of the microcomputer 39 turns on the warning lamp 29 from the digital output port D2 via the warning lamp driving circuit 36, and does not detect the clogging state of the filter 13. Then, the warning lamp 29 is turned off from the digital output port D2 via the warning lamp driving circuit 36.

The negative pressure detection circuit 35 receives a signal from the gauge pressure sensor 30 that detects the internal pressure state of the filter device 10 as a difference from the atmospheric pressure, and can be recognized by the microcomputer 39 as a voltage signal in which the differential pressure is proportional to the voltage. This voltage is converted into a voltage, and this voltage is input to the analog signal input port Ain2 of the microcomputer 39. By the calculation of the microcomputer 39, the filter 13 can be compared and calculated with a clogging pressure threshold set by the user to be described later. The pressure state is converted into an electrical signal.
[Description of Means for Setting Clogging Threshold]
FIG. 3 shows an example of the clogging threshold pressure setting volume 34.

  In FIG. 3, 48 is a setting knob, 49 is a filter internal pressure scale, 50 is a clogging pressure setting scale (1), 51 is a clogging pressure setting scale (2), and a warning lamp 29 is provided at the top. .

  The setting knob 48 is interlocked with the clogging threshold setting volume 34 so that it is substantially zero when the voltage input to the analog input port Ain0 of the microcomputer 39 is turned to the full left, and increases when turned to the right. ing. When this setting knob 48 is turned to the full right, the pressure inside the filter is at or above the maximum vacuum level of the dust collector 1.

  The clogging pressure setting scale (1) 50 is an arrow shown as a guide for the filter clogging threshold pressure when the dust collector 1 is used with the strong / weak / stop switching switch 26 set to “weak”, and the left arrow When the setting knob 48 is marked at the position, the internal pressure of the filter at the minimum reached pressure under the approximate use conditions, and when the setting knob 48 is marked at the right arrow position, the maximum is reached under the approximate use conditions. It is the internal pressure value of the filter at the ultimate pressure.

  The clogging pressure setting scale (2) 51 is an arrow shown as a guideline for the filter clogging threshold pressure when the dust collector 1 is used with the strong / weak / stop switch 26 set to “strong”. When the setting knob 48 is marked at the position, the internal pressure of the filter at the minimum reached pressure under the approximate use conditions, and when the setting knob 48 is marked at the right arrow position, the maximum is reached under the approximate use conditions. It is the internal pressure value of the filter at the ultimate pressure.

  In the microcomputer 39, when the intake device 7 is in an operating state, the pressure value set by the setting knob 48 is compared with the pressure detected by the filter internal pressure detecting means, and the pressure detected by the filter internal pressure detecting means is set. If the pressure value is larger than the pressure value set at 48, processing is performed assuming that filter clogging is detected. When the intake device 7 is in an operating state, the process for detecting the filter clogging is performed by turning on the warning lamp 29, and the process for not detecting the filter clogging is performed by turning off the warning lamp 29. That is.

  From the above, when the intake device 7 is in an operating state, the setting knob 48 is slowly turned from full right to the left, and the position of the setting knob 48 immediately before the warning lamp 29 changes from the off state to the on state is the inside of the filter at that time. Pressure is on.

  The main motor 9 has two sets of field windings and is switched to a strong operation / weak operation / stop state by operating the strong / weak / stop switch 26. The operation and stop states can also be switched by the digital output signal D1 of the microcomputer 39 via the main motor drive circuit 37. Furthermore, if the main motor 9 is phase-controlled using, for example, a bidirectional phase control element (triac) as the power control element of the main motor drive circuit 37, the intake capacity of the intake device 7 can be changed. In the present embodiment, a case where the apparatus is used in three operating states of strong / weak / stop will be described.

  The state of operation / stop of the dust removal motor 16 is switched by the digital output signal D0 of the microcomputer 39 via the dust removal motor drive circuit 38. Further, a soft start operation can be performed by chopping the power control element, and a method of preventing a voltage drop of the DC power supply 41 due to a start-up current of the dust removal motor 16 by the soft start operation can also be employed.

  As described above, the dust collector 1 having the structure and function as described above can take two operation modes, that is, a single-action operation and an interlock operation. In the single action operation, when the interlock / single action changeover switch 27 is turned on to the single action side, and the strong / weak / stop changeover switch 26 is turned on to “strong” or “weak”, the main of the intake device 7 This is an operation mode in which the motor 9 is in an operating state, in which the interlock / single action switch 27 is turned on to the interlock side or the strong / weak / stop switch 26 is turned on to the stop side. The main motor 9 is turned off.

  In the linked operation, the power tool 47 is connected to the outlet 24 in a state where the linked / single-acting switch 27 is turned on to the linked side and the strong / weak / stop switch 26 is turned “strong” or “weak”. When the electric tool 47 is connected and a current flows through the outlet 24, the current of the outlet 24 is detected by the current detector 25, and the detected current is detected by the outlet current detection circuit 33 by the microcomputer 39. Is converted into a recognizable voltage and input to the analog signal input port Ain1 of the microcomputer 39.

  When the microcomputer 39 detects that the electric tool 47 connected to the outlet 24 is in an operating state by the calculation of the microcomputer 39, the microcomputer 39 outputs an ON signal to the digital output signal D1, and the main motor drive circuit 37 When the power tool 47 connected to the outlet 24 is turned off and no current flows through the outlet 24 in an operation mode in which the main motor 9 is in an operating state, the input to the analog signal input port Ain1 of the microcomputer 39 is zero. Therefore, it is detected that the electric tool 47 is in a stopped state.

  At this time, the microcomputer 39 outputs an OFF signal to the digital output signal D <b> 1 after the main motor 9 is kept in an operating state for several seconds set in advance, and the main motor drive circuit 37 turns off the main motor 9. This is because immediately after the power tool 47 is stopped, the dust is still passing through the hose 42, so that the air intake device 7 is operated while the dust in the hose 42 is collected.

When operating in the interlocking operation mode, when the interlocking / single-acting changeover switch 27 is turned on to the single-acting side, the interlocking operation mode is canceled and the state of operation in the above-described single-acting operation mode is entered. When the strong / weak / stop switch 26 is turned on, the main motor 9 is immediately turned off regardless of the operating state of the electric tool 47.
[Usage example of dust collector]
The operation when the dust collector 1 having the above structure and function is operated in, for example, the single-action operation mode and the floor suction port 45 is used in the weak operation will be described.

  As illustrated in FIG. 4 as a conventional dust collector, a hose 42 is connected to the suction port 3 of the dust collector 1, and a hose connection handle 43 that an operator holds to perform cleaning work is connected to the tip of the hose 42. Two extension pipes 44 are connected to the tip of the hose connection handle 43, and a floor suction port 45 is connected to the tip.

  Next, when the interlock / single action changeover switch 27 is turned on to “single action” and the strong / weak / stop changeover switch 26 is turned on to “weak”, the main motor 9 enters the operation state in the weak operation mode and is used for flooring. Dust collection is possible from the suction port 45. The setting knob 48 is set near the right arrow of the clogging pressure setting scale (1) 50. At this time, if the dust collector 1 is used in the same working environment as before, and the same dust is collected, the following operation can be performed by setting the clogging pressure setting scale (1) when used before. May be omitted.

  Next, when the dust collection is continued in that state, the suction becomes a little worse and the filter 13 is clogged, and it is better to remove the dust from the filter 13, the warning lamp 29 is not yet lit. Then, the setting knob 48 is turned to the left to turn it on, and the interlock / single action selector switch 27 is turned on to “interlock”, or the strong / weak / stop selector switch 26 is turned on to “stop” and the intake device 7 is turned on. Stop. Then, the dust removal motor 16 rotates after ten seconds, and dust removal is automatically performed.

  From now on, when the dust collection operation is resumed with the setting knob 48 left as it is, if the intake device 7 is stopped when it is felt that the filter 13 is clogged, dust removal is automatically performed in the same manner. At this time, the processing of the microcomputer 39 of the control circuit 20 detects that the vehicle is operating in the single-action operation mode from the state of the interlock / single-action switch 27, and when the intake device 7 is in the operating state, the intake device 7 Is detected by means for detecting the operating state of the intake device 7 based on the contact information of the strong / weak / stop switch 26 described above, and is indicated by the mark position of the setting knob 48 which is a clogging pressure setting means. The pressure detected by the filter internal pressure detection means is compared. When the pressure detected by the filter internal pressure detection means is greater than the pressure value set by the clogging pressure setting means, filter clogging is detected. The process is performed.

  The process that the filter clogging is detected when the intake device 7 is in an operating state is that the warning lamp 29 is turned on, and the process that is performed when the filter clogging is not detected is that the warning lamp 29 is turned off. It is to be. When the intake device 7 is stopped, the processing of the microcomputer 39 stores the filter clogging detection state when the intake device 7 is in the operation state immediately before the intake device 7 is stopped, and the operation state of the intake device 7 is in the stop state. If the filter clogging detection state is a state in which filter clogging is detected, the warning light 29 is turned off after the dust removal motor 16 has been operated for a preset number of seconds. Then, the drive of the dust removal motor 16 is stopped, the dust collector 14 is automatically stopped, and wasteful power consumption is suppressed.

  If filter clogging is not detected, the process ends without operating the dust removal motor 16. It is determined that the dust removal device 14 is operated in the filter clogging detection state immediately before the stop of the intake device 7 because the dust inside the hose 42 is relatively small immediately before the stop and whether there is dust ahead from the suction port 3. This is because there are many reproducible pressure states and there is a strong correlation with the clogging of the filter 13, and the maximum pressure during operation is the pressure state when a large amount of dust is sucked into the hose 42. This is because there are many cases and the correlation with the clogging of the filter 13 is poor.

  In addition, the dust removal motor 16 is operated only for a predetermined number of seconds by rotating the dust remover 18 and knocking off the adhering dust, and fine dust such as the cutting dust of the electric tool is attached. In some cases, the adhering dust does not fall if it is not struck for a certain period of time regardless of the amount of adhesion, and the dust removal effect cannot be obtained even if the tapping time is made longer than a certain period.

  If the field winding of the main motor 9 is made into one set, and the main motor 9 is phase-controlled using, for example, a bidirectional phase control element (triac) as the power control element of the main motor drive circuit 37, the intake device 7 It is also possible to change the intake capacity. Even at this time, it is possible to set the clogging threshold.

  In addition, the dust source 14 is driven not by a motor but by a oscillating vibrator, or when the dust remover oscillates instead of a rotational motion, or a dust removing device that simply applies vibration to the filter. good.

It is side sectional drawing of the dust collector which concerns on this invention. It is a block diagram which shows the structure of the control apparatus of the dust collector which concerns on this invention. It is a figure which shows the example of the volume for setting the clogging threshold pressure of a filter. It is a perspective view of the conventional dust collector provided with the inlet for floors. It is a perspective view of the conventional dust collector used by attaching to the dust collection mechanism of an electric tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Tank 3 Suction port 4 Main motor base 5 Motor cover 6 Head cover 7 Intake device 8 Suction fan 9 Main motor 10 Filter device 11 Filter housing 12 Filter cover 13 Filter 14 Dust removal device 15 Dust removal device base 16 Dust removal motor 17 Reduction gear device 18 dust remover 19 dust cover 20 control device 21 operation panel 22 pressure measurement end 23 power plug 24 outlet 25 current detector 26 strong / weak / stop switch 27 interlock / single action switch 28 dust removal motor ON switch 29 warning light 30 gauge Pressure sensor 31 Main switch strength / weak / stop detection circuit 32 ON / OFF switch detection circuit 33 Outlet current detection circuit 34 Clogging threshold setting volume 35 Negative pressure detection circuit 36 Warning light drive circuit 37 Main Motor drive circuit 38 Dust removal motor drive circuit 39 Microcomputer 40 Insulation transformer 41 DC power supply 42 Hose 43 Hose connection handle 44 Extension pipe 45 Floor suction port 46 Power tool dedicated suction port 47 Electric tool 48 Setting knob 49 Filter internal pressure scale 50 Clogging Pressure setting scale (1)
51 Clogging pressure setting scale (2)

Claims (2)

An air intake device for sucking dust;
A tank having a suction port and storing dust sucked by the suction device;
A filter device provided between the main motor base on which the intake device is installed and the tank to separate dust and air;
A dust removing device provided inside the filter device for dropping dust adhering to the filter;
Operation control means for controlling the operation of the dust removing device;
An operation detecting means for detecting an operation state of the intake device;
Signal converting means for converting the pressure state inside the filter device into an electrical signal;
A control circuit having means for comparing / calculating input / output states and pre-stored values;
In a dust collector comprising:
Provided is a clogging pressure setting means for setting a clogging threshold pressure that can be changed even when the intake device is in an operating state, and immediately before the intake device stops when the operation detecting means detects the stop of the intake device. The filter from the signal converting means and the signal from the clogging pressure setting means detect the clogging state of the filter, and when the filter is clogged, the operation control means operates the dust removing device. A dust collector that performs dust removal of the filter device.   The dust collector according to claim 1, wherein the operation control unit stops the dust removing device after operating for a predetermined time.

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