JP2007190526A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector capable of accurately detecting clogging of a filter regardless of an operation mode of the dust collector in the dust collector for detecting clogging of the filter of the dust collector to automatically perform dust removal. <P>SOLUTION: In the dust collector, a threshold value of a clogging pressure determined from an operation mode of the dust collector, an internal pressure of a filter device, an action of a suction device, a power source frequency of the suction device and a power source voltage of the suction device; and an internal pressure of the filter device immediately before the suction device is stopped. Clogging of the filter is detected and when the filter is in the clogging state, the dust-removal means is operated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power tool for cutting wood such as a circular saw or a jigsaw, or a power tool used for drilling, cutting, or polishing a concrete or stone material such as a hammer drill or stone cutter. The present invention relates to a dust collector that collects dust from a hose connected to a dust collection mechanism attached to the machine and cleans cutting dust and grinding powder in a work place.

A conventional dust collector will be described with reference to FIGS.
FIG. 8 shows a conventional workplace where electric tools for cutting wood such as circular saws and jigsaws, and electric tools used for drilling, cutting, and polishing in concrete and stone such as hammer drills and stone cutters are used. A dust collector for cleaning floors is shown. In FIG. 8, a hose 42, a hose connection handle 43, two extension pipes 44, a floor suction port 45, and the like are connected to the suction port 3 of the dust collector 1. Usually, an operator holds the hose connection handle 43. Perform cleaning work.

  Dust on the floor is sucked together with ambient 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. .

  The dust collector 1 of FIG. 7 is operated by operating a switch on the operation panel 21 and has a hose connection handle 43 to suck in dust on the floor of the work place and collect the dust. The operator often operates near the dust collector 1 and the hose 42 is often thick and short with a diameter of about 38 mm and a length of about 2.5 m.

  Fig. 9 shows that cutting dust from power tools for cutting wood such as circular saws and jigsaws, and power tools used for drilling, cutting and polishing in concrete and stone such as hammer drills and stone cutters are directly sucked with a dust collector. A conventional dust collector that collects dust is shown.

  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 the dust collecting mechanism of the electric tool 47 via the electric tool suction port 46, and the cutting dust of the electric tool 47 is transferred to the electric tool suction port 46. From the suction port 3 to the dust collector 1 via the hose 42.

  When the dust collector 1 of FIG. 9 is used, the operator often operates the electric tool 47 away from the dust collector 1, and the hose 42 is thin and long with a diameter of about 2.5 mm and a length of 3 m or more. I often use a hose. This is because the operation of the electric tool 46 may be hindered if the hose 42 is thick and short. Further, when the outlet 24 is provided in the dust collector operation panel 21 or the like and the power tool 47 is operated by receiving power supply from the outlet 24, the dust collector automatically enters the operating state. When the power tool 46 is stopped, the dust collector There is also a case where a function of a linked operation mode in which the operation is automatically stopped after the operation state is set. And the dust collector 1 provided with the interlocking operation mode often has the function of performing the same operation as the dust collector 1 shown in FIG. 7 by switching the dust collector 1 between the operation state and the stop 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 interlocked operation mode.

  Cutting dust such as wood, stone, concrete, gypsum board, etc., mainly collected by the dust collector 1 shown in FIGS. 8 and 9 described above, has a lot of fine dust, and the dust-containing air is converted into dust and clean air. The filter that is separated into two is likely to be clogged. For this reason, conventionally, a dust collector equipped with a dust removal mechanism that removes dust adhering to a filter has been used in the field of cutting work such as wood, stone, concrete, and gypsum board.

Among them, there is a dust collector that has an operation arm for operating a dust removal mechanism in a dust collector exterior part, and an operator operates the operation arm every time the filter is clogged to manually remove dust. (For example, see Patent Document 1)
Also, the means for changing the pressure inside the filter to an electrical signal is compared with a preset threshold signal, and the dust removal device is automatically activated only when the preset threshold signal is larger than the electrical signal that changed the pressure inside the filter. There is a dust collector to drive. (For example, see Patent Document 2)
JP-A-9-000843 JP 60-212140 A

  The above-described conventional dust collector that manually removes dust has a drawback that it is troublesome because an operator operates the operation arm to remove dust manually each time the filter is clogged. In addition, there are many cases where workers do not have a means of recognizing clogging, and depending on their experience, or noticing after the suction force is reduced, dust removal work may be performed after the clogged state of the filter deteriorates. There were also cases where the dust collector was used in a state where the dust collection capability was not fully demonstrated.

  Also, in the dust collector that automatically operates the dust remover, when operating multiple electrical products such as dust collectors and other electrical products from the same wiring path power supply, the voltage drop due to the dust collector intake device operation, Due to the voltage drop due to the operation of the electrical products used together, the capacity of the dust collector's intake device decreases, the dust attached to the filter increases, and even if it becomes clogged, the pressure inside the filter does not decrease, In some cases, clogging could not be detected and the clogged state was used.

  In addition, cutting dust such as wood, stone, concrete, gypsum board, etc. has a lot of fine dust, and fine dust that cannot be separated by the filter passes through the filter and is discharged to the outside mixed with exhaust gas There is also. In such a case, dust may adhere to the pressure detection end for detecting the pressure inside the filter, making it impossible to detect the pressure.

  In addition, an outlet is attached to the dust collector and the dust collector is operated in conjunction with the operation of the power tool that receives power from the outlet. In the dust collector equipped with the mode, the pressure change inside the filter is greatly different between the linked operation and the single-acting operation. The filter could not be automatically dedusted.

  In addition, when water was accidentally sucked in, the motor of the dust removing device inside the filter was flooded, and there was a possibility of electric shock through the motor power supply.

  Moreover, in order to drive the automatic dust remover after stopping the dust collector operation, the power supply to the dust collector main body is continued even after the main switch of the dust collector is turned off. It was.

  An object of the present invention is a dust collector that eliminates the above-mentioned conventional drawbacks, detects dust clogging, and automatically removes dust, and can accurately detect clogging of a filter regardless of the operation mode of the dust collector. An object of the present invention is to provide a dust collector capable of reducing electric power.

  To achieve the above object, the present invention provides a tank having a suction port for storing dust, an intake device for sucking dust, an exhaust port for discharging exhaust gas discharged from the intake device, and capturing dust. A dust collector having a filter device and dust removing means for removing dust adhering to the filter device, wherein the dust collector detects an operating state of the other device and an outlet for supplying electric power from the dust collector to the other device. Device operation detecting means, mode selecting means for selecting the operation mode of the dust collector, pressure detecting means for detecting the internal pressure of the filter device, intake device operation detecting means for detecting the operation of the intake device, and the intake air Frequency detection means for detecting the power supply frequency of the apparatus, power supply voltage detection means for detecting the power supply voltage of the intake apparatus, a signal of the pressure detection means immediately before the intake apparatus stops, and the intake air Means for comparing with a preset clogging pressure threshold value determined from the intake device operation detection means, the frequency detection means and the power supply voltage detection means immediately before the stoppage, and the clogging pressure threshold value is When the intake device operation detection means detects the stop of the intake device, the comparison means detects the clogging of the filter by comparing the signal of the pressure detection means immediately before the intake device stops and the clogging pressure threshold. In addition, a dust collector is provided in which the dust removing means is operated when the filter is clogged.

  According to the dust collector of the first aspect, it is possible to detect clogging of the filter with high accuracy regardless of the operation mode of the dust collector.

  According to the dust collector of Claim 2, it becomes possible to aim at reduction of power consumption.

An embodiment of the dust collector of the present invention will be described with reference to FIGS. 1 to 7, 10, and 11. 1 is a side sectional view showing the structure of the dust collector of the present invention, FIG. 2 is an external view of an operation panel, FIG. 3 is a block diagram showing the function of the control device, and FIGS. 4 and 5 are dust collectors of the present invention. 6 and 7 show examples of measuring the clogging pressure of the dust collector of the present invention, and FIGS. 10 and 11 show examples of setting the clogging threshold value of the dust collector of the present invention.
Hereinafter, the upper direction shown in FIG. 1 will be described as the upper side, and the lower direction will be described as the lower side.

  As shown in FIG. 1, the dust collector 1 includes a main motor base 4 in which a main motor cover 5 is attached to an upper opening of a cylindrical tank 2 that stores dust having a suction port 3, and a head cover 6. It is clamped by a clamping member (not shown). An intake device 7 is provided between the main motor base 4 and the motor cover 5. The intake device 7 includes a suction fan 8 and a main motor 9 that rotates the suction fan 8. The intake device 7 sucks outside air (air) from a suction port 3 (to be described later) via a filter 13 and a suction port 4a provided on the lower side of the main motor base 4, and the main motor base 4, the main motor cover 5, and the head cover. 6 is exhausted from the exhaust port 4b to the outside of the dust collector 1 via an exhaust path constituted by 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 includes a filter 13 for capturing dust, and the filter 13 is operated by the operation of the intake device 7. A filter cover 12 that prevents the filter 13 from being crushed by the negative pressure inside the filter 13 is attached to constitute the filter device 10.

  The dust removing device 14 of the present invention is provided in a portion surrounded by the filter housing 11 and the filter 13. The dust removal device 14 attached to the dust remover base 15 includes a dust removal motor 16 that drives the dust removal device 14, a dustproof cover 19 that prevents dust from entering the dust removal motor 16, and an output shaft (not shown) of the dust removal motor 16. And a dust remover 18 that is provided on the output shaft of the reduction gear device and removes dust adhering to the filter 13 by striking (vibrating) by driving a dust removal motor.

  The horizontal center M1 of the air intake device 7, the filter 13, the filter cover 12, and the dust removing device 11 is substantially on the same line, and is deflected from the center line M2 of the tank 2 in the direction opposite to the mounting position of the suction port 3. Yes.

  An operation panel 21, a control circuit 20, an insulating transformer 40, and the like are installed in a portion of the main motor cover 5 located above the suction port 3. As shown in FIG. 2, the operation panel 21 includes an outlet 24 that supplies power to the electric tool 47 that operates in conjunction, a strong / weak / stop switch 26 that switches dust collection operation of the dust collector 1, an interlock / single action switch 27, A dust removal motor switch 28, a warning lamp 29, and the like are provided.

  In the vicinity of the position where the control device 20 is installed and above the suction port 3 of the main motor cover 5, at a position away from the main air flow path provided by the intake device 7. The pressure measuring end 22 is attached. The pressure measuring end 22 is connected to a gauge pressure sensor 30 installed in the control circuit 20 by a hose or a pipe. 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. Since the control circuit 20 and the pressure measuring end 22 are installed close to each other, they can be connected with a short hose or piping, and a gauge pressure sensor 30 and a negative pressure detection circuit 35 described later are mounted together with the control circuit 20. it can.

  The suction port 3 is connected to a hose 42 or an extension pipe 44 as in the conventional dust collector shown in FIGS. 8 and 9, and a power tool 47 with a dust collection mechanism and a floor suction port 45 are attached to the tip of the suction port 3. It has a structure in which cutting dust and dust such as wood, stone, concrete, and gypsum board are sucked together with air.

Next, the control apparatus of the dust collector of this invention is demonstrated using FIG.
The power plug 23 is connected to a commercial power source (for example, AC 100V), and controls the operation of the main motor 9 and the main motor 9 through one contact of a strong / weak / stop switch 26 serving as a main switch of the dust collector 1. Electric power is supplied to the outlet 24 that supplies power to the motor drive circuit 37, the primary side of the insulation transformer 40, and other external devices such as other electric tools 47. A diode bridge 48 that performs full-wave rectification is connected to the secondary side of the isolation transformer 40, and the output of the diode bridge 48 is connected to the power supply voltage detection circuit 34 via the other contact of the strong / weak / stop switch 26. , And a contact of a relay 49 serving as a means for holding the power source.

  The relay 49 is ON / OFF controlled by an output signal of the output port D3 of the microcomputer 39 via the relay drive circuit 50. For this reason, when the outlet 23 is connected to the power source and the strong / weak / stop switch 26 is turned “strong” or “weak”, the insulation transformer 40, the diode bridge 48, and the strong / weak / stop switch 26 are switched. Power is supplied through the other contact. Then, by the processing of the microcomputer 39, an output signal is output from the output port D3 so that the contact of the relay 49 is turned on to the relay drive circuit 50, and also through the contact of the isolation transformer 40, the diode bridge 48, and the relay 49. , Power is supplied.

  Next, when the strong / weak / stop switch 26 is turned to “stop”, power is supplied through the other contact of the isolation transformer 40, the diode bridge 48, and the strong / weak / stop switch 26. The path is cut off, but power is still supplied through the contacts of the isolation transformer 40, the diode bridge 48, and the relay 49. By this operation, the relay 49 has a self-holding function.

  The dust removal motor 16 that receives power supply from the DC power supply 41, the dust removal motor drive circuit 38 that drives the dust removal motor 16, and the control circuit 20 are insulated from an external power supply supplied from the outlet 23 by the insulation transformer 40. Although not shown, the power control element of the main motor drive circuit 37 is electrically insulated by an optical insulation coupler called a phototriac or photocoupler. Thereby, even when the dust removal motor 16 is submerged, the user's electric shock can be prevented.

  The device operation detecting means for detecting the operation of the external device such as the electric tool 47 connected to the outlet 24 detects the current of the outlet 24 by the current detector 25, and the detected current is detected by the outlet current detection circuit 33 and the microcomputer. The voltage is converted into a voltage that can be recognized by the computer 39, and is input to the analog signal input port Ain1 of the microcomputer 39. The power tool 47 connected to the outlet 24 has recently been improved in functionality and has many devices 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 peak value or average value of the current waveform detected by the current detector 25, but the current of the DC power supply device and the driving source of the electric tool 47. It is desirable to have a function of distinguishing and recognizing the current of the series commutator motor.

  The intake device operation detection means for detecting the operating state of the intake device 7 converts the contact information of the strong / weak / stop switch 26 into a digital voltage that can be recognized by the microcomputer 39 by the main switch strong / weak / stop detection circuit 26. Then, the signals are input to the digital signal input ports P00 and P01 of the microcomputer 39, and the operation is detected by the calculation of the microcomputer 39.

  The power supply frequency detection means for detecting the power supply frequency converts the signal applied to the common contact (not shown) into a signal obtained by clamping the voltage before smoothing after full-wave rectification of the power supply circuit to 5 V by the clamp circuit. A square wave that changes from 5 V to zero volts at zero-crossing intervals of the voltage waveform, and the power supply frequency is detected by calculation of the microcomputer 39 at intervals of zero volts.

  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 operation time of 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. Processing is performed assuming that the operation state has been stopped. This process is the same when an OFF signal is output to the digital output port D1 of the microcomputer 39 and the main motor 9 is stopped. The operation time with inertia is approximately 10 seconds.

  The interlock / single action switch 27 includes an interlock operation mode in which the intake device is operated according to the detection result of the means (apparatus operation detection means) for detecting the operation state of the electric tool 47 connected to the outlet 24, and the apparatus operation detection means. It is a switch for selecting two operation modes of the single action operation mode in which the intake device is operated according to the setting of the main switch (strong / weak / stop switching switch 2) of the dust collector 1 regardless of the detection result. Normally, the operation mode is the interlock operation mode when the common electrode and the normally open electrode of the interlock / single action selector switch 27 are in the OFF state, and the single action operation mode when it is in the ON state. 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. In the interlock operation mode, when the electric tool 47 changes from the operation state to the stop state, the intake device 7 is stopped after continuing to operate the intake device 7 for several seconds. This is because when the electric tool 47 with a dust collection mechanism is operated in combination, a long hose is often used as described above, and dust is prevented from clogging the hose.

  The dust removal motor ON switch 28 is an operation switch for operating the dust removal device 14. When the user presses this switch, the dust remover 14 is in an operating state for a few seconds and removes the dust from 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 it is not in a state where it has been detected, the dust removing device 14 does not operate even if the user presses this switch. This is because the dust attached to the filter 13 cannot be removed under negative pressure even if dust is removed while the intake device 7 is operating and rotating with inertia, so the dust removal device 14 is not operated while the intake device 7 is operating. This is to reduce power consumption due to the operation of the dust removal device having no effect and to avoid damage to the filter 13.

  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.

  The pressure detection means receives the signal of the gauge pressure sensor 30 that detects the pressure state inside the filter device 10 as a difference from the atmospheric pressure, and converts the pressure detection means 35 into a voltage that can be recognized by the microcomputer 39. A means for changing the pressure state inside the filter into an electric signal that can be input to the analog signal input port Ain2 of the microcomputer 39 and compared with a preset clogging pressure threshold value by the calculation of the microcomputer 39. is there.

  The main motor 9 has two sets of field windings, and is switched between a strong operation, a weak operation, and a stopped state by operating the strong / weak / stop switch 26. Further, the operation and stop states can be switched by the digital output signal D1 of the microcomputer 39 via the main motor drive circuit 37. Further, 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 description of the present embodiment, only the case of using in the three operating states of strong, weak and stopped will be described for the sake of simplicity.

  The dust removal motor 16 can be switched between an operation state and a stop state by a digital output signal D0 from the microcomputer 39 via the dust removal motor drive circuit 38. Further, it is possible to perform a soft start operation by chopping the power control element, and there is a method for preventing a voltage drop of the DC power source due to the start-up current of the dust removal motor in the soft start operation.

  The power supply voltage detection circuit 34 converts the secondary voltage of the isolation transformer 40 into a voltage that can be recognized by the microcomputer 39, and inputs the voltage to the analog signal input port Ain 0 of the microcomputer 39. The means for detecting is formed.

  The dust collector 1 having the structure and function as described above can be used in two operation modes, that is, a single-acting operation and an interlocking operation, like the conventional dust collector described above.

  When used in single-acting operation, when the interlock / single-acting changeover switch 27 is turned on to the single acting side and the strong / weak / stop changeover switch 26 is turned on strongly or weakly, the main of the intake device 7 The motor 9 enters the operating state. At the start of this operation, when the strong / weak / stop switch 26 is turned on to “strong” or “weak”, the contact of the relay 49 is controlled to be in the ON state by the processing of the microcomputer 39.

  Next, the main motor 9 is turned off when the interlock / single-acting switch 27 is turned on to the interlocking side or the strong / weak / stop selector switch 26 is turned on. At this time, since the contact of the relay 49 is in the ON state, power is continuously supplied to the dust removing device 14 and the control circuit 20.

  In linked operation, the power tool 47 is connected to the outlet 24 with the interlock / single-acting switch 27 turned on to the interlocking side and the strong / weak / stop switch 26 is turned on or off. This is an operation mode in which the main motor 9 of the intake device 7 is in an operation state when it is detected that 47 is in an operation state. The operation state of the electric tool 47 is detected when the current flows through the outlet 24 of the dust collector 1 by detecting the current of the outlet 24 with the current detector 25, and detecting the detected current with the outlet current detection circuit 34. When the voltage is converted into a recognizable voltage and input to the analog signal input port Ain1 of the microcomputer 39 and the operation of the power tool 47 connected to the outlet 24 is detected by the calculation of the microcomputer 39, the microcomputer 39 outputs an ON signal to the digital output signal D1, and the main motor 9 is put into operation by the main motor drive circuit 37. At the start of this operation, when the strong / weak / stop switch 26 is turned on to “strong” or “weak”, the contact of the relay 49 is controlled to be in the ON state by the processing of the microcomputer 39. Next, when the electric tool connected to the outlet 24 is turned off and no current flows through the outlet 24, the input of the analog signal input port Ain1 of the microcomputer 39 becomes zero, so that the electric tool 47 is stopped. Detect something. At this time, after leaving the main motor 9 in an operating state for several seconds, the microcomputer 39 outputs an OFF signal to the digital output signal D 1, and the main motor drive circuit 37 turns off the main motor 9. At this time, since the strong / weak / stop changeover switch 26 is set to “strong” or “weak”, the dust removing device 14 and the control circuit 20 are continuously supplied with power. When operating in the interlocking operation mode, if 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 power tool. However, as described in the description of the single-action operation, power is continuously supplied to the dust removing device 14 and the control circuit 20.

  As described above, since the intake device 7 continues to rotate for a while due to inertia even when the main motor 9 is turned off, the pressure inside the filter does not become atmospheric pressure. About 10 seconds after turning off. The calculation of the microcomputer 39 performs processing that it is detected that the operation state of the intake device 7 has been stopped when 10 seconds have elapsed from the time when the power to the main motor 9 is turned off.

  The filter clogged state of the dust collector 1 having the above structure and function is the amount of air that is the amount of air passing through the filter 13 during operation of the intake device 7 is reduced from the state in which no dust adheres to the filter. However, since the pressure inside the filter has a strong correlation with the air volume, the dust collector of the present invention employs a method in which the pressure value inside the filter is used to determine filter clogging.

  Further, as described above, a series commutator motor is often used as the main motor 9 of the intake device 7 of the relatively small dust collector 1 such as the dust collector 1 of the present invention. The characteristics of the device 7 are greatly different depending on its operating state, power supply frequency, and power supply voltage. FIG. 4 shows an example of measuring the relationship between the air volume and the degree of vacuum when the intake device 7 is operated with strong operation and the power supply frequency and the power supply voltage are changed. FIG. 5 shows operation of the intake device with weak operation. Each example shows the measurement of the relationship between the air volume and the degree of vacuum when the power frequency and the power voltage are changed. The air volume and the degree of vacuum are measured outside the suction port. The input power when operating at 100 V / 50 Hz is roughly 1200 W during strong operation and about 600 W during weak operation. 4 and 5 that the curves indicating the relationship between the air volume and the degree of vacuum are different between the power supply frequencies of 50 Hz and 60 Hz.

  Moreover, it turns out that the curve which shows the relationship between the air volume measured by changing power supply voltage into 70V, 80V, 100V, 110V and the degree of vacuum differs with power supply voltage. Further, comparing the curves showing the relationship between the air volume and the degree of vacuum in FIGS. 4 and 5 having the same power supply frequency and voltage, it can be seen that there is a great difference between the strong operation and the weak operation.

  FIG. 5 shows that the power supply voltage is changed in four operating states when the power frequency is 50 Hz and 60 Hz, respectively, when the main motor 9 of the intake device 7 is operated strongly and when it is operated weakly. This is an example of measuring the internal pressure of the filter when the filter is clogged. Since the judgment of filter clogging is strongly influenced by the user's subjectivity, the measurement in FIG. 5 is performed when the air volume measured at the position of the suction port 3 is reduced by 30% from the state where dust does not adhere to the filter. It is the result measured as a clogged state. As shown in FIG. 5, the clogging pressure varies depending on the power supply frequency, the operating state of the main motor 9 of the intake device 7, and the power supply voltage. For this reason, it is desirable to set a clogging threshold value in each state. In particular, since the change in the clogging pressure with respect to the change in the power supply voltage is large, it is necessary to set a fine threshold value.

  FIG. 7 shows that when the power source frequency is 50 Hz, the main motor 9 of the intake device 7 is operated strongly, the power tool suction port 46 and its hose are attached to the tip of the suction port 3, the floor suction port 45 and It is the example which changed the power supply voltage when a hose was attached, and measured the filter internal pressure at the time of filter clogging. The determination of filter clogging when the power tool suction port 46 and its hose are attached is based on the condition that the airflow measured at the position of the suction port 3 is from the state where dust is not attached to the filter and the hose is not attached to the suction port 3. It is the result of measuring the time when 70% is reduced as a filter clogged state. The judgment of filter clogging when the floor suction port and the dedicated hose are attached is 30% as in FIG. As shown in FIG. 7, the clogging pressure differs greatly when the power tool suction port 46 and its dedicated hose are attached and when the floor suction port 45 and its dedicated hose are installed. For this reason, it is desirable to set a clogging pressure threshold value when the floor suction port is attached and the above-described single-acting operation is performed, and when the power tool suction port 46 is attached and the above-described interlocked operation is performed.

  FIG. 10 and FIG. 11 show examples of clogging pressure threshold setting adopted in the dust collector of the present invention. FIG. 10 is an example of a preset clogging pressure threshold value in the above-described single-acting operation mode operated in the same configuration as the conventional dust collector for cleaning the floor or the like shown in FIG. FIG. 11 shows the preset eyes in the linked operation mode shown in FIG. 9 which is operated with the same configuration as the conventional dust collector that directly collects the cutting dust of the power tool by the dust collector and collects the dust. It is an example of threshold value setting of clogging pressure.

  For example, a description will be given of an operation in a state where the operation is performed in the single action mode, the operation is weak, the power supply frequency is 60 Hz, the dust collector of the present invention is used, and the power supply voltage is lowered to 96V. The processing of the microcomputer 39 that has detected that the vehicle is operating in the single-acting operation mode from the state of the interlock / single-acting changeover switch 26 indicates that when the intake device 7 is in the operating state, the intake device operating state and the power supply frequency are Based on the contact information of the strong / weak / stop changeover switch 26, the means for detecting the operating state of the intake device 7 and the power supply frequency detection means detect the power supply voltage, and the power supply voltage detection means detects the power supply voltage. Then, the selection of the clogging pressure threshold value from the threshold values shown in FIG. 10 is selected from the state of the interlock / single action changeover switch 26, and four columns from the column of FIG. (60 Hz, weak operation) is selected, and the voltage detected by the power supply voltage detection means is 98 V. Therefore, it is described in 4 columns (60 Hz, weak operation), 6 rows (92.5-97.5 V) in FIG. 9.13 kPa is selected as a preset clogging pressure threshold value, compared with the pressure detected by the filter internal pressure detection means, and the pressure detected by the filter internal pressure detection means is selected as the preset clogging pressure threshold value. When the value is greater than 9.13 kPa, processing is performed assuming that filter clogging is detected. The process that the filter clogging is detected when the intake device 7 is in operation is to turn on the warning lamp 29, and the process that does not detect the filter clogging is to turn off the warning lamp 29. It is.

  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 becomes the stop state. If the filter clogging detection state is a state where filter clogging is detected, the warning light 29 is turned off after the dust removal motor has been operated for several seconds. If filter clogging is not detected, the process ends without operating the dust removal motor.

  Further, for example, when the operation is performed in the interlock operation mode, the operation is strong operation, the power supply frequency is 50 Hz, the dust collector of the present invention is used, and the power supply voltage is 105 V, the processing of the microcomputer 39 is / From the state of the single-acting changeover switch 26, it is selected that the clogging pressure threshold value is selected from the threshold values shown in FIG. 1 column (50 Hz, strong operation) is selected, and the voltage detected by the power supply voltage detection means is 105 V. Therefore, 1 column (50 Hz, strong operation), 8 rows (102.5 to 107. 5V) is selected as a preset clogging pressure threshold value, and the same operation as in the case of operation in the single-action operation mode is performed.

  As described above, the dust remover of the type that knocks off dust adhering to the filter with a dust remover operates when the intake device 7 is stopped. As described in the description of the conventional dust collector, the strong / weak / stop switch 26 for operating / stopping the intake device also has a power ON / OFF function. For this reason, even if the strong / weak / stop switch 26 is turned to “stop”, the contact of the relay 49 is turned on so that power is continuously supplied to the dust removing device 14 and the control circuit 20. The dust remover can be operated. This self-holding time is set to approximately ten and several minutes in consideration of the case where the user operates the dust removal motor ON switch 28 to remove dust. When the self-holding time has elapsed, the relay contact is turned off, and the standby power of the dust collector is almost lost.

  If the main motor 9 is phase-controlled by using, for example, a bidirectional phase control element (triac) as a power control element of the main motor drive circuit 37 as a set of field windings of the main motor 9, It is also possible to change the intake capacity. Even at this time, it is possible to accurately detect the operating state of the intake device and set a clogging threshold value suitable for it.

  Also, the drive source of the dust remover 14 is not a motor but a swinging vibrator, or the dust remover moves not in a rotational motion but in a swing motion, or simply a dust remover that applies vibration to the filter. Also good.

The cross-sectional view which shows one Embodiment of this invention dust collector. The external view of the operation panel of this invention dust collector. The block diagram which shows the function of the control apparatus of this invention dust collector. The example which measured the air volume and vacuum degree of this invention dust collector. The example which measured the air volume and vacuum degree of this invention dust collector. The example which measured the clogging pressure of this invention dust collector. The example which measured the clogging pressure of this invention dust collector. A conventional dust collector with floor suction. A conventional dust collector that is attached to the dust collection mechanism of an electric tool. The setting example of the clogging threshold value of this invention. The setting example of the clogging threshold value of this invention.

Explanation of symbols

1 is a dust collector, 2 is a tank, 3 is a suction port, 4 is a main motor cover, 7 is an intake device, 9 is a main motor, 10 is a filter device, 11 is a filter housing, 14 is a dust removal device, 20 is a control circuit, 22 Is a pressure measuring end, 26 is a strong / weak stop changeover switch, 49 is a relay, and 50 is a relay drive circuit.

Claims (2)

A tank with a suction port for storing dust,
An air intake device for sucking dust;
An exhaust port for exhausting exhaust exhausted from the intake device;
A filter device for capturing dust;
A dust collector having dust removing means for removing dust attached to the filter device, the dust collector comprising:
An outlet for supplying power from the dust collector to other devices;
Device operation detecting means for detecting the operating state of the other device;
Mode selection means for selecting the operation mode of the dust collector;
Pressure detecting means for detecting the internal pressure of the filter device;
An intake device operation detecting means for detecting the operation of the intake device;
A frequency detection means for detecting a power supply frequency of the intake device;
Power supply voltage detection means for detecting the power supply voltage of the intake device;
The signal of the pressure detection means immediately before the intake device stops and the preset clogging pressure threshold value determined from the intake device operation detection means, the frequency detection means and the power supply voltage detection means immediately before the intake device stops are compared. Means,
The clogging pressure threshold value is compared with the clogging pressure threshold value by the comparing means when the intake device operation detection means detects the stoppage of the intake device. Thus, the dust collector detects the clogging of the filter and operates the dust removing means when the filter is clogged. 2. The dust collector according to claim 1, wherein the dust removing means is stopped after operation for a predetermined time.

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