JP6161284B2 - Dust collector - Google Patents

Description

  In this invention, a main body provided with an electric blower is provided on the upper part of a tank provided with a suction port, the outside air is sucked from the suction port by driving the electric blower, and dust in the outside air is removed by a filter provided in the tank. It relates to a dust collector to be captured.

  For example, in Patent Document 1, a filter group that separates a gas inlet and a gas outlet of a dust container is built in a dust container of a sealed structure, and the dust container that has become negative pressure due to exhaust from the gas outlet. A dust collector that sucks dust together with air from a gas inlet and captures the dust with a filter group is disclosed. Further, the dust collector is provided with a plurality of outside air intake pipes having one end projecting from a dust container and opening, and the other end having an outside air discharge port, and the outside air inlet is opened by an electromagnetic valve. As a result, the outside air sucked from the outside air inlet is blown from the outside air outlet to the filter group to remove dust adhering to the filter group.

  In this dust collector, for example, when two outside air suction pipes are provided, the electromagnetic valve of one outside air suction pipe is opened during the operation of the dust collector, and the electromagnetic valve of the other outside air suction pipe is closed. While removing the dust adhering to a part of the filter group using the outside air suction pipe and cleaning the filter group, the dust can be captured by another part of the filter group (automatic dust removal).

Japanese Patent No. 3457929

However, since the above dust collector uses a plurality of electromagnetic valves for opening and closing the outside air intake pipe, a device for electrically controlling the electromagnet for driving the electromagnetic valve is required, and the structure of the dust collector becomes complicated. Is concerned.
In addition, since the above dust collector uses a plurality of electromagnetic valves, there are cases where the operations of the plurality of electromagnetic valves are different from each other, and there is a possibility that the closed state of the outside air inlet for dust removal is different from each other. A situation in which the state of dust removal is different between a part of the filter group and the other part may occur.

The present invention has been proposed in view of such a situation, and an object thereof is to provide a dust collector that has a simple structure and can clean a filter during operation.
In addition, the present invention accurately controls the position of the valve (blocking member) for removing dust, thereby ensuring proper operation of the valve and the motor that drives the valve, such as ensuring an appropriate closed state by the valve. An object is to provide a dust collector to obtain.

The invention of claim 1 is a dust collector comprising a filter, a tank covering the filter, and a fan for introducing outside air into the tank, and collecting dust by ventilating the filter in a forward flow direction. to vent the backflow direction to the filter, together with the valve closing the vent for venting to the forward flow direction is provided, the valve, DC motor of order is moved to a position closing the vent by a rotary shaft is provided is, after the valve is in the open state does not block the vent, a current value of the DC motor, also the rotary shaft receives resistance force regardless of the DC motor is supplied with electric time a value above which exhibits in a state that can not rotate Te is, when continued for more than a predetermined time, the valve, that the control to control means are provided such that the closed state of closing the vent And butterflies.

A first related invention includes a filter, a tank covering the filter, a main body held by the tank, a wheel that allows the tank to travel, and a fan for introducing outside air into the tank. In the dust collector that collects dust by ventilating the filter in the forward flow direction, the main body is provided with two valves for venting the filter in the reverse flow direction, and the valves are individually driven. A motor is provided.

The second related invention includes a filter, a tank covering the filter, a main body held by the tank, a wheel that allows the tank to travel, and a fan for introducing outside air into the tank. In the dust collector that collects dust by ventilating the filter in the forward flow direction, the main body is provided with two valves for venting the filter in the reverse flow direction, and for opening and closing the valves individually. A motor is provided, and the motor is controlled by detecting a current of the motor.

A third related invention includes a filter, a tank that covers the filter, a main body that is held by the tank, a wheel that allows the tank to travel, and a fan that introduces outside air into the tank. In the dust collector that collects dust by ventilating the filter in the forward flow direction, the main body is provided with two valves for venting the filter in the reverse flow direction, and for opening and closing the valves individually. A motor is provided, and the closing operation of the valve by the motor is stopped at a predetermined time after starting the closing operation of any one of the valves by the motor.
According to a fourth related invention, in the first to third related inventions, the fan is provided in the main body.
According to a fifth related invention, in the first to fourth related inventions, the filter is attached to the main body.

According to a second aspect of the invention, in the above invention, the valve is provided with a plurality, the rotary shaft of the DC motor is coupled to a contactable cam member in a plurality of said valve, said DC motor Is characterized by individually opening and closing the plurality of valves via the cam member.

According to the present invention, the fact that the motor is locked due to the inability to move the valve can be reliably distinguished from other factors, and the operation in the closed state of the valve (maintenance of the closed state for a predetermined time, etc.) ) Can be executed reliably.
According to the first related invention, the valve can be reliably closed and opened with a simple configuration, and the dust collecting operation by the ventilation in the forward flow direction and the dust dropping operation of the filter by the ventilation in the reverse flow direction are surely performed. Can be executed.
According to the second related invention, the dust removing operation and the dust collecting operation of the filter can be reliably performed with a simple configuration.
According to the third related invention, the valve can be surely closed during the predetermined time, and the situation where the cleaning state of the filter varies can be prevented, and the filter can always be sufficiently cleaned. .

1 is an overall perspective view of a dust collector according to an embodiment of the present invention. It is a whole perspective view of the main body with which the dust collector is equipped. It is a disassembled perspective view of the filter fixing member, main body case, and main body case cover which comprise the main body. It is a whole perspective view of the main body case. It is a whole perspective view of the main body case cover. It is a top view of the main body case. It is a reverse view of the main body case. It is a perspective view of the 2nd opening-and-closing member which can open and close the communicating path formed in the main body case. It is a figure explaining the operation | movement which a pair of filter provided in the tank capture | acquires dust. It is a figure explaining the operation | movement which cleans the filter of the right side and captures dust with the filter of the left side. It is principal part side sectional drawing of the main body. It is a typical end view of the virtual horizontal surface containing the front-end | tip part of a cam member based on the 1st control example (and 2nd control example) of this invention. It is a flowchart of the dust removal operation | movement which concerns on the 2nd control example of this invention. It is a typical time chart showing the application condition of the voltage with respect to the DC motor which concerns on the 2nd control example of this invention. It is a partial sectional side view of the main body with which the dust collector of other embodiment is provided.

<Configuration of the present embodiment>
An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the dust collector 1 includes a traveling platform 2, a tank 3, and a main body 4. The traveling table 2 is formed of a synthetic resin, and a circular concave groove 5 (see FIG. 1) is provided on the upper surface of the traveling table 2. One front wheel 6 is rotatably provided on the bottom surface in the center of the front of the carriage 2 (front side in FIG. 1), and a pair of rear wheels 7 and 7 are provided on the left and right sides of the carriage 2 (back side in FIG. 1). Is rotatably provided. The dust collector 1 can be driven by front wheels 6 and rear wheels 7 and 7.

  The tank 3 is made of stainless steel and is formed in a bottomed cylindrical shape having an upper opening. The tank 3 is placed on the upper surface of the traveling platform 2 in a state of being fitted in the groove 5. A suction port 8 is formed on the front surface of the tank 3 (front side in FIG. 1). A dust collecting hose is connected to the suction port 8. Furthermore, hooks 9 and 9 are attached to the outer surface of the tank 3. As shown in FIG. 1, the main body 4 can be fixed to the upper portion of the tank 3 by engaging the end portions of the hooks 9 and 9 with hook engaging portions 19 and 19 (see FIG. 2) of the main body case 11 described later. It is said that.

  As shown in FIG. 3, the main body 4 includes a filter fixing member 10, a main body case 11, and a main body case cover 12. The filter fixing member 10 is fixed to the lower surface of the main body case 11 by tightening a screw. As shown in FIGS. 3 and 9, the filter fixing member 10 includes a hollow portion 14 that protrudes downward from the center toward the rear, closes the lower surface, and opens the upper surface. Further, the filter fixing member 10 is provided with elongated holes 15, 15 extending in the front-rear direction on the left and right outer sides of the hollow portion 14. In addition, as shown in FIGS. 2 and 3, latch members 16, 16 that can swing via a support shaft are attached to the left and right side surfaces of the filter fixing member 10. In addition, an electrode holding plate 17 protruding downward is fixed to the front lower surface of the filter fixing member 10 with a screw.

  As shown in FIGS. 2, 3, and 9, pre-filters 20 and 20 that are primary filters are attached to the lower surface of the filter fixing member 10 in communication with the long holes 15 and 15. By fixing the main body 4 to the upper part of the tank 3, the pre-filters 20 and 20 and the electrode holding plate 17 protrude from the lower surface of the filter fixing member 10 into the tank 3. On the back surface of the electrode holding plate 17, a pair of water level detection electrodes (not shown) are held at the same position in the vertical direction with a predetermined interval in the horizontal direction. In the present embodiment, a voltage is applied to the pair of water level detection electrodes, and when the water level detection electrodes are connected through water, it is detected that the amount of water that has entered the tank 3 has become a certain amount. . When it is detected that water has entered the tank 3, the operation of the dust collector 1 is stopped. The pre-filter 20 is a cylindrical body made of woven cloth having an oval shape in plan view and an upper portion opened and a lower portion closed, and the suction port 8 and the main body 4 can be partitioned in the tank 3. A ring-shaped locking member 21 (see FIGS. 2 and 3) is attached to the peripheral edge of the upper portion of the prefilter 20. In the present embodiment, the left and right latch members 16, 16 are engaged with the locking members 21 of the respective prefilters 20, so that each prefilter 20 is fixed in close contact with the lower surface of the filter fixing member 10. In addition, each prefilter 20 is subjected to a known antistatic process for adding an antistatic agent.

  As shown in FIGS. 3 and 9, a paper filter 22 serving as a tertiary filter is mounted inside each pre-filter 20 in a state communicating with the long hole 15. The filter 22 is a cylindrical body having an oval shape in plan view, an upper portion opened and a lower portion closed, and the filter surface is projected into the prefilter 20. Further, a filter 23 made of polyurethane sponge serving as a secondary filter is mounted on the filter surface of the filter 22 in each pre-filter 20. By fixing the main body 4 to the upper part of the tank 3, the filters 22 and 23 can partition the suction port 8 and the main body 4 in each pre-filter 20. The prefilter 20 and the filters 22 and 23 are examples of the filter of the present invention.

  As shown in FIGS. 3 and 4, the main body case 11 is made of synthetic resin and protrudes downward from the front (front side in FIGS. 3 and 4) from the center, and has a bottomed cylindrical portion 25 whose upper surface is open. It has. An air inlet 26 (see FIG. 4) is formed at the center of the lower surface of the cylindrical portion 25. In a state where the filter fixing member 10 is fixed to the lower surface of the main body case 11, the tubular portion 25 can be fitted into the hollow portion 14 of the filter fixing member 10. An electric blower 31 (see FIGS. 3 and 11) is fitted into the tubular portion 25 in a posture in which a fan cover 30 (see FIG. 3) covering the fan F (see FIG. 11) is directed downward. The fan F is connected to the tip of a rotating shaft 35 (see FIG. 11) of the motor, and a plurality of air discharge portions 32 (see FIGS. 3 and 11) are provided on the upper outer peripheral surface of the fan cover 30. Is provided. Since the fan cover 30 is fitted into the tubular portion 25 with the upper side remaining, the air discharge portions 32 can be arranged so as to be located outside the tubular portion 25. When the fan cover 30 is fitted into the tubular portion 25, the vent H (see FIG. 11) provided in the center of the lower surface of the fan cover 30 is disposed so as to face the intake port 26 of the tubular portion 25. The 3 and 11, reference numeral 27 is a ring-shaped seal member that seals between the lower edge of the fan cover 30 and the air inlet 26, and reference numeral 28 is a sound absorbing material.

  Further, as shown in FIG. 9, the filter fixing member 10 extends from the front to the rear on the left and right outer sides of the tubular portion 25 fitted in the hollow portion 14 and wraps around to the rear of the tubular portion 25. Intake passages 33 and 34 are formed so as to communicate with each other. Both intake passages 33, 34 communicate with the long holes 15.

  As shown in FIGS. 4, 6, and 9, a motor housing portion 37 is disposed on the upper surface of the main body case 11. The motor housing portion 37 is erected so as to surround a reduction gear cover 40 (see FIGS. 3 and 11) attached to the DC motor 36 behind the cylindrical portion 25. As shown in FIGS. 6 and 7, a communication hole 38 is formed on the upper surface of the main body case 11 corresponding to the bottom surface of the motor housing portion 37 to allow the motor housing portion 37 to communicate with the inside of the main body case 11. The DC motor 36 is placed in the motor housing portion 37 by tightening screws into the screw holes of the speed reducer cover 40 attached to the DC motor 36 and the screw holes 39, 39 (see FIGS. 4 and 6) of the motor housing portion 37. Fixed. An output shaft 42 (see FIG. 11) of the DC motor 36 is substantially L-shaped in a side view through a communication hole 38 via a speed reducer 41 (see FIGS. 3 and 11) housed in a speed reducer cover 40. A cam member 43 (see FIGS. 9 and 11) is connected. In this embodiment, the DC motor 36 is reciprocated in the left-right direction, so that the cam member 43 can also be reciprocated in the left-right direction.

  As shown in FIGS. 4 and 6, an exhaust passage 44 is provided on the upper surface of the main body case 11. The exhaust passage 44 includes a space 47 surrounded by a wall surface 45 (see FIG. 4) connected to the upper surface opening of the cylindrical portion 25 and a rib 46 (see FIG. 4). As will be described later, the air discharged from each air discharge portion 32 (see FIG. 3) located on the downstream side of the electric blower 31 passes through the exhaust passage 44 and the exhaust port 48 and the exhaust window 49 (see FIG. 5). ) To the outside of the main body 4.

  On the other hand, as shown in FIGS. 4, 6, and 9, communication passages 50 and 51 that are continuous with the downstream side of the exhaust passage 44 are formed on the upper surface of the main body case 11 on the left and right outside of the motor housing portion 37. As shown in FIGS. 4 and 6, the intake air that connects the communication passages 50, 51 and the intake passages 33, 34 (see FIG. 9) to the upper surface of the main body case 11 corresponding to the downstream side of the communication passages 50, 51. Mouth 52 and 53 are formed, respectively. Therefore, the exhaust passage 44 and the intake passage 33 can be communicated with each other via the communication passage 50 and the intake port 52, and the exhaust passage 44 and the intake passage 34 can be communicated with each other via the communication passage 51 and the intake port 53. . In addition, hook engaging portions 19, 19 are provided on the upper surface of the main body case 11. Further, as shown in FIGS. 3 and 9, a ring-shaped seal member 13 is attached to the lower surface of the main body case 11. Thereby, the main body case 11 can be fixed to the tank 3 in a close contact state.

  As shown in FIGS. 6, 7, and 9, the communicating portion and the hollow portion 14 are separated from the communicating portion with the hollow portion 14 on the downstream side of the intake port 52 in the intake passage 33. An inclined wall 57 is provided. The inclined wall 57 is formed integrally with an inclined wall forming member 56 (see FIGS. 3 and 7) attached to the communication portion. A plate-like first opening / closing member 55 (the valve in the present invention, which can open and close the vent hole 58 via a support shaft 60 (see FIG. 9) is provided near the inclined wall 57 on the lower surface of the main body case 11. 9) is supported rotatably. The code | symbol 54 in FIG. 7 is a fitting hole by which the spindle 60 is rotatably fitted. In a normal state, as shown in FIG. 9, the first opening / closing member 55 is biased to a posture extending in the vertical direction at a position where the vent 58 is opened. As shown in FIGS. 6, 7, and 9, the inclined wall 57 has an upper side inclined to the normal first opening / closing member 55 side with respect to the lower side, and a ventilation space 59 that maintains a ventilation interval (see FIG. 9). .) Is opposed to the normal first opening / closing member 55. The inclined wall 57 is an example of the inclined portion of the present invention.

  On the other hand, as shown in FIGS. 8 and 9, a plate-like second opening / closing member 61 capable of opening / closing the intake port 52 is provided at the intake port 52 of the communication passage 50. The second opening / closing member 61 includes a bar-shaped arm portion 62 that extends in the vertical direction and has a tip facing the first opening / closing member 55. Further, the second opening / closing member 61 is rotatably supported in the communication path 50 around a support shaft 63 (see FIG. 9) supported on the bottom surface of the communication path 50. In a normal state, the second opening / closing member 61 is urged in a lateral posture at a position where the intake port 52 is closed by its own weight.

  Similarly to the communication portion with the hollow portion 14 in the intake passage 33 described above, the communication portion with the hollow portion 14 on the downstream side of the intake port 53 in the intake passage 34 shown in FIG. An inclined wall 57 is provided. In addition, a first opening / closing member 55 that can open and close the vent hole 58 is also provided in the vicinity of the inclined wall 57. Similarly to the intake port 52 of the communication passage 50, a second opening / closing member 61 capable of opening and closing the intake port 53 is also provided in the intake port 53 of the communication passage 51 shown in FIGS. 6 and 9.

  In order to suppress an increase in the vertical dimension of the dust collector 1, the pair of pre-filters 20 and 20 are opposed to each other in the tank 3 at a lateral interval outside the DC motor 36 as shown in FIG. 9. Arranged. Further, each first opening / closing member 55 is disposed so as to be positioned between the pre-filter 20 and the DC motor 36 in the lateral direction of the dust collector 1.

The main body case cover 12 shown in FIGS. 1 to 3 and FIG. 5 is made of synthetic resin and closes the upper surface opening of the main body case 11. The main body case cover 12 protrudes upward from the front from the center and opens the upper surface. A cover accommodating portion 67 is provided. In a state where the main body case cover 12 is fixed to the upper portion of the main body case 11 by tightening screws to the main body case cover 12 and the main body case 11, the torso cover housing portion 67 has a torso cover 72 that houses the motor of the electric blower 31 ( (See FIG. 3). Further, as shown in FIG. 5, an exhaust port 48 is formed on the upper surface of the main body case cover 12 to communicate the upper surface with the upper surface opening of the main body case 11. In addition, a plurality of exhaust windows 49 are formed on the wall surface 75 located rearward on the main body case cover 12. Further, on the front surface of the main body case cover 12, an operation unit 76 is provided in which various switches such as an operation switch S and an outlet for supplying power to external devices are arranged. Note that reference numerals 77 and 78 in FIG. 3 are housed in the main body case cover 12, reference numeral 77 is a controller as control means, and reference numeral 78 is a sound absorbing material.
The controller 77 is electrically connected to various electric actuating members (or any part thereof) including the DC motor 36, and the various electric actuating members or these (or any other part thereof). ) To control various members (such as the cam member 43).
Further, the controller 77 has storage means (not shown) inside, and also has a counting means that can grasp the passage of an arbitrary time, and a left / right movement time counter that can measure the left / right movement time described later. .
Further, the controller 77 has a lock determining means for determining whether or not the DC motor 36 is in a locked state (locked). The locked state of the DC motor 36 is a state in which the rotating shaft 42 cannot rotate due to a resistance force or the like despite being supplied with electricity. Here, the controller 77 determines that the DC motor 36 is in the locked state when the current value of the DC motor 36 has exceeded a predetermined value for a predetermined time (for example, 200 ms (milliseconds)) or longer.
In addition, the controller 77 has initial position return required time calculation means for calculating the initial position return required time using the left and right moving time grasped by the left and right moving time counter. Here, the initial position return required time calculating means calculates the initial position return required time by dividing the left-right movement time by 2.

<Overall operation of this embodiment>
Next, the operation of the dust collector 1 will be described. When the operation switch S (see FIG. 1) provided in the main body 4 (see FIG. 1) of the dust collector 1 is turned on, the motor F of the electric blower 31 shown in FIG. (See FIG. 11). Then, outside air containing dust is sucked into the tank 3 from the suction port 8 (see FIG. 1) through the dust collecting hose, and the outside air is mixed with the pre-filters 20 and 20 and the both filters 23 shown in FIG. , 23 and the filters 22 and 22 and enter the intake passages 33 and 34 from the long holes 15 respectively. At this time, both the pre-filters 20 and 20 capture dust, and the two filters 23 and 23 and both the filters 22 and 22 sequentially capture dust that has passed through both the pre-filters 20 and 20.
The direction of ventilation from the tank 3 through the prefilter 20 and the filters 23 and 22 to the intake passage 33 (34) from the long hole 15 is the forward flow direction in the present invention.

  Subsequently, the outside air that has entered both the intake passages 33 and 34 passes through the vent 58 and the vent space 59 of the inclined wall 57 and enters the hollow portion 14 of the filter fixing member 10, respectively. 26 (refer to FIG. 11) passes through the vent hole H (refer to FIG. 11) of the fan cover 30 and is guided into the fan cover 30. In the present dust collector 1, a pair of intake passages from the suction port 8 to the vent hole H of the fan cover 30 that contacts the upstream side of the electric blower 1 are formed with the pre-filters 20 and the filters 23 and 22 as described above. The pair of intake passages are joined near the vent H of the fan cover 30. Further, the air guided into the fan cover 30 is discharged from the air discharge portions 32 (see FIGS. 3 and 11) to the exhaust passage 44 shown in FIG. Through each exhaust window 49 (see FIG. 5).

  The dust trapped in the prefilter 20 and the filters 23 and 22 causes clogging of the filter. In order to prevent this, in the present embodiment, the prefilter 20 and the filters 23 and 22 can be cleaned by performing the operation (dust removal operation) described below during the operation of the dust collector 1. As the output shaft 42 of the DC motor 36 rotates during the dust collection operation in which dust is captured by the two pre-filters 20, 20, both the filters 23, 23 and the two filters 22, 22, as shown in FIG. As shown, the cam member 43 rotates to the right and contacts the first opening / closing member 55 of the intake passage 34. Then, as a result of the first opening / closing member 55 being pushed by the cam member 43 toward the inclined wall 57 side of the intake passage 34, the first opening / closing member 55 is in contact with the inclined wall 57 in a state of closing the vent hole 58 and eliminating the ventilation interval. The passage 34 is closed. As a result, the first opening / closing member 55 closes one of the intake passages from the suction port 8 to the fan cover 30 via the intake passage 34. At this time, the arm part 62 is pushed away from the inclined wall 57 by the first opening / closing member 55, so that the second opening / closing member 61 rotates in conjunction with the closing operation of the intake passage 34 by the first opening / closing member 55. . As a result, as shown in FIG. 10, the second opening / closing member 61 opens the intake port 53 of the communication path 51.

  As shown in FIG. 10, when the intake passage 34 is closed and the intake port 53 is opened, the tank 3 and the body case 11 are under negative pressure. 4 is guided into the intake passage 34 from the intake port 53 as indicated by a two-dot chain line arrow in FIG. Exhaust gas in the intake passage 34 flows back into the right filter 22 from the long hole 15 by flowing backward from the downstream side of the intake passage 34 to the upstream side, and then the filter 22, the right filter 23, and the right pre-pass. The filter 20 is sequentially passed back to the tank 3. At this time, the dust captured by the filters 20, 22, and 23 can be blown off by the exhaust gas flowing backward. Therefore, in the present dust collector 1, the right pre-filter 20 and the right filters 23 and 22 can be cleaned while dust is captured by the left pre-filter 20 and the left filters 23 and 22. In addition, since the left and right pre-filters 20 are each subjected to antistatic processing, dust is prevented from adsorbing to the pre-filter 20 due to static electricity. As a result, dust releasability is improved.

The exhaust gas that has passed through the right filters 22, 23, 20 and returned into the tank 3 enters the intake passage 33 through the long hole 15 after passing through the left pre-filter 20 and the left filters 23, 22. As a result, the other intake passage extending from the suction port 8 to the fan cover 30 via the intake passage 33 is joined.
From such an intake passage 34 (33), the air enters the right filter 22 through the long hole 15, and sequentially passes through the right filters 22, 23 and the right pre-filter 20 into the tank 3. The direction of ventilation is the reverse flow direction that is the reverse of the forward flow direction in the present invention.

On the other hand, when the cam member 43 rotates to the left side and contacts the first opening / closing member 55 of the intake passage 33 during the dust collection operation, the first opening / closing member is the same as when the cam member 43 rotates to the right side. By operating 55 and the second opening / closing member 61, the exhaust gas that has passed through the exhaust passage 44 is guided into the intake passage 33 from the intake port 52 (see FIG. 4). At this time, the first opening / closing member 55 that has been in contact with the inclined wall 57 of the intake passage 34 returns to a position where the vent 58 is opened as shown in FIG. Therefore, dust can be captured by the right pre-filter 20 and the right filters 23 and 22. The exhaust gas in the intake passage 33 flows backward from the downstream side of the intake passage 33 to the upstream side, and as a result, sequentially passes through the left filters 22 and 23 and the left prefilter 20 and is returned to the tank 3. At this time, the dust captured by the filters 20, 22, and 23 can be blown off by the exhaust gas flowing backward. Therefore, the left pre-filter 20 and the left filters 23 and 22 can be cleaned while dust is captured by the right pre-filter 20 and the right filters 23 and 22. In the dust collector 1, the cam member 43 reciprocates in the left-right direction to open and close the first opening / closing member 55 that can open and close the vent 58 of the intake passage 33 and the first opening / closing member 55 that can open and close the vent 58 of the intake passage 34. As a result of alternating contact with the opening / closing member 55, the closing operation of the intake passage 33 and the closing operation of the intake passage 34 can be performed alternately. The DC motor 36 and the cam member 43 are an example of the operating means of the present invention.
Regarding the air flow direction during cleaning in the left filter group, the forward flow direction and the reverse flow direction can be referred to as in the air flow direction related to the right filter group described above.

<First Example of Automatic Dust Removal Control of the Present Embodiment (First Control Example)>
The controller 77 controls the DC motor 36 (or the position / orientation of the cam member 43 through the same) and the like in the dust removal operation, and the first example (first control example, The same applies hereinafter).

The rotation shaft 42 of the DC motor 36 is set in advance so as to have a predetermined rotation speed in accordance with the application of voltage.
The controller 77 applies a predetermined voltage to the DC motor 36 based on an input of a predetermined switch, and rotates about a rotation shaft 42 of the DC motor 36 at a predetermined rotation speed corresponding to the application of the predetermined voltage. The cam member 43 rotates at a specific rotation speed that is different from the predetermined rotation speed (may be the same as the predetermined rotation speed by the reduction ratio of the speed reducer 41).

FIG. 12 shows a schematic end view (viewed from above) of a virtual horizontal plane K including the tip of the cam member 43 (the part where the cam member 43 abuts against the first opening / closing member 55). A point M in FIG. 12 is a portion where an extension line of the rotating shaft 42 of the DC motor 36 intersects the horizontal plane K, and an arc R indicates a rotationally movable range of the cam member 43.
The controller 77 positions the cam member 43 at a predetermined cam initial position PC0 via the rotary shaft 42 of the DC motor 36 in the normal state (a state where only the dust collecting operation is performed without the dust dropping operation). Here, as described above, the cam initial position PC0 is a position where each first opening / closing member 55 takes a posture of opening the corresponding vent 58 and extending in the vertical direction. From the cam member 43 at the initial cam position PC0 (the right side of the tip portion, that is, the portion capable of contacting the right first opening / closing member 55), the right vent 58 (the inclined wall 57 of the right intake passage 34 is contacted). The distance to the right first opening / closing member 55) in the posture is the first cam rotational movement distance LC1. Similarly, the distance from the cam member 43 at the initial cam position PC0 to the left first opening / closing member 55 in the opened state (the contact portion with the inner wall) is the second cam rotational movement distance LC2. Yes. Here, the first cam rotational movement distance LC1 and the second cam rotational movement distance LC2 are set equal. That is, the cam member 43 at the initial cam position PC0 is at a distance from the right first opening / closing member 55 assumed to be opened to the maximum to the left first opening / closing member 55 assumed to be opened to the maximum. Located at point. In other words, the cam initial position PC0 is located at the midpoint of the arc R.
It should be noted that the cam member 43 is rotated to the rightmost position when the cam member 43 takes a posture in which the right first opening / closing member 55 is just brought into contact with the inclined wall 57 (a posture in which the right vent hole 58 starts to be closed so as not to be ventilated). The position is PC1. Similarly, in relation to the left first opening / closing member 55, the cam leftmost rotation position PC2 is considered.
Further, regarding the rotational position of the rotating shaft 42 of the DC motor 36, the rotational position when the cam member 43 is at the cam initial position PC0 is the initial position P0, and the rotational position when the cam member 43 is at the cam right most rotational position PC1. Is the right most rotation position P1, and the rotation position when the cam member 43 is the cam left most rotation position PC2 is the left most rotation position P2. In FIG. 12, for easy understanding, the initial position P0, the rightmost rotation position P1, and the leftmost rotation position P2 are shown to correspond to the rotation positions of the respective cams. However, since the speed reducer 41 actually exists. Depending on the reduction ratio, the rightmost rotation position P1 and the leftmost rotation position P2 are different from those in FIG.

Therefore, if the controller 77 drives the rotating shaft 42 of the DC motor 36 for the first specific time obtained by dividing the first cam rotation distance LC1 by the specific rotation speed for the cam member 43 at the cam initial position PC0. The right first opening / closing member 55 can be disposed at a position (blocking position) where the ventilation hole 58 has a closed posture without a ventilation interval.
If the controller 77 drives the rotating shaft 42 of the DC motor 36 for the second specific time obtained by dividing the second cam rotation distance LC2 by the specific rotation speed for the cam member 43 at the cam initial position PC0. The first opening / closing member 55 on the left can be disposed at the closed position.
Here, since the first cam rotation distance LC1 and the second cam rotation distance LC2 are the same distance, the first specific time and the second specific time are the same time.
When the controller 77 wants to move the cam member 34 from the rightmost rotational position P1 to the leftmost rotational position P2, the controller 77 rotates the rotating shaft 42 for the time obtained by adding the first specific time and the second specific time, The same applies to the movement from the rotational position P2 to the rightmost rotational position P1.
For the rotation shaft 42 at the initial position P0 of the DC motor 36, the first rotation distance from the rotation position corresponding to the initial position P0 to the rotation position corresponding to the rightmost rotation position P1 is set at the predetermined rotation speed. The divided value (first predetermined time) is the same as the first specific time. The value obtained by dividing the second rotational distance from the rotational position of the initial position P0 to the rotational position corresponding to the leftmost rotational position P2 by the predetermined rotational speed (second predetermined time) is the second specific time. It will be the same.

For example, the controller 77 drives the DC motor 36 in the following order as the dust removal operation.
First, the controller 77 rotates the rotating shaft 42 forward from the initial position P0 for a first predetermined time to the rightmost rotation position P1, and the cam member 43 as the cam rightmost rotation position PC1, and the right filters 20, 23, For the dust removal operation 22, the right first opening / closing member 55 is just brought into contact with the inclined wall 57 to block the right ventilation port 58 so as not to allow ventilation. Then, the controller 77 continues this blockage for a predetermined dust removal time.
Next, the controller 77 reverses the rotation shaft 42 from the right most rotation position P1 to the left most rotation position P2 by the sum of the first predetermined time and the second predetermined time, and moves the cam member 43 to the cam left most rotation position. As the PC 2, the left first opening / closing member 55 is just brought into contact with the inclined wall 57 to block the left vent hole 58 so that ventilation cannot be performed for the dust removing operation of the left filters 20, 23, 22. Then, the controller 77 continues this blockage for a specific dust removal time (may be the same as the predetermined dust removal time).
Subsequently, the controller 77 rotates the rotating shaft 42 forward for the second predetermined time from the left most rotation position P2 to the initial position P0, and returns the cam member 43 to the cam initial position PC0.

In the first control example, the controller 77 drives the rotary shaft 42 of the DC motor 36 for a predetermined first predetermined time or second predetermined time, so that any one of the vent holes 58 is formed on the cam member 43. It can be controlled to a position where it can be closed via the first opening / closing member 55, and a dust drop operation can be realized with simple control.
However, if the predetermined rotational speed of the rotating shaft 42 fluctuates and becomes slower than this, if the first predetermined time or the second predetermined time based on the predetermined rotational speed is used for control, the cam member 43 moves to the rightmost position. The rotation of the rotary shaft 42 is stopped without reaching the rotation position PC1 or the leftmost rotation position PC2, and the ventilation hole 58 cannot be closed so as not to be ventilated, and there is a possibility that the dust removing operation is insufficient. Arise.
In addition, when the predetermined rotational speed of the rotating shaft 42 fluctuates fast or slowly, it also affects the operation when returning to the initial position P0, and without returning to the appropriate initial position P0, the next dust removal operation is performed. The possibility of reducing accuracy arises.
Examples of the fluctuation factors of the predetermined rotation speed related to the rotation shaft 42 include the power supply situation and the progress of wear of various parts of the DC motor 36 and the speed reducer 41 (based on the change in sliding friction).
Further, immediately after the rotation of the rotary shaft 42, the speed reducer 41, and the like, the inertia of the motion due to the rotational force until immediately before works, so it is necessary to determine the first predetermined time and the second predetermined time in consideration of this.

<Second control example, etc.>
Next, a second control example will be described. FIG. 13 is a flowchart of the dust removal operation according to the second control example of the present invention, and FIG. 14 is a schematic time chart showing a voltage application state to the DC motor 36 in the dust removal operation.
In the second control example, when the start of the dust removal operation is instructed by operating the corresponding switch or the like, the end of the dust removal operation is instructed by another operation (such as the next depression of the dust removal operation start switch). The dust removal operation continues until
The dust removal operation of the second control example generally returns from the initial position P0 of FIG. 12 to the initial position P0 via the rightmost rotation position P1 and the leftmost rotation position P2, and then from the initial position P0 to the leftmost rotation position P2 and the right. The operation returns to the initial position P0 after passing through the most rotational position P1, and further repeats the above.

The dust removal operation of the second control example will be described in more detail.
At the start of the dust removal operation, the rotary shaft 42 is at the initial position P0, and the cam member 43 is at the cam initial position PC0.
When the dust removal operation is started, the controller 77 applies a positive predetermined voltage (+ V) to the DC motor 36 to perform normal rotation (forward rotation) of the rotating shaft 42 of the DC motor 36 (FIG. 13). Step S1 of FIG. 14, the front portion of the horizontal portion T1 in FIG. Then, the controller 77 determines whether or not the DC motor 36 is locked (step S2). If the DC motor 36 is not locked (No), the DC motor 36 continues normal rotation. The determination of the lock state in step S2 is a case where the time during which the current value of the DC motor 36 is equal to or greater than a predetermined value continues for a predetermined time or more as described above. Does not affect.
On the other hand, when the DC motor 36 is locked (Yes in step S2), the controller 77 continues the normal rotation of the DC motor 36 until the counter means grasps the elapse of a predetermined time (in this case, 200 ms) after starting the closing operation. (Step S3, rear part of the horizontal part T1). When the cam member 43 reaches the rightmost rotation position PC1 and hits the periphery of the right vent 58 via the right first opening / closing member 55, the right first opening / closing member 55 enters a closed state (closed state) in which ventilation is impossible. The DC motor 36 is locked because it cannot rotate the rotating shaft 42 even when voltage is applied. If the cam member 43 is in the rightmost rotation position PC1, the first opening / closing member 55 is closed, and the vent hole 58 is blocked by the first opening / closing member 55 so that the air cannot be vented. Therefore, the right filter group is cleaned. The operation for closing the first opening / closing member 55 is referred to as the closing operation for the first opening / closing member 55 (valve).

When the controller 77 grasps the elapse of 200 ms, it temporarily stops the DC motor 36 for a predetermined stop time (for example, 50 ms) (step S4, horizontal portion T2), and then applies a negative predetermined voltage (−V) to the DC motor 36. Then, the rotating shaft 42 of the DC motor 36 is reversed (rotated in the reverse direction) (step S5, front portion of the horizontal portion T3).
The controller 77 starts time measurement by the left / right movement time counter at the start of reverse rotation of the rotating shaft 42 (step S6), and continues to measure time by the left / right movement time counter during reverse rotation, and whether or not it is locked. Is monitored (step S7).
When the DC motor 36 is locked (Yes in Step S7), the controller 77 stops driving the left / right movement time counter (Step S8). Thereby, the controller 77 can grasp the time required for the cam member 43 to actually move from the cam right most rotation position PC1 to the cam left most rotation position PC2 in the left / right movement time counter. The time actually required for the rotation from the most rotational position P1 to the left most rotational position P2 can be grasped.
Further, the controller 77 continues the reverse rotation command of the DC motor 36 in the locked state until 200 ms elapses, and cleans the left filter group (step S9, rear portion of the horizontal portion T3). That is, the controller 77 assumes that the duration of the locked state (the state where the current value of the DC motor 36 is equal to or greater than the predetermined value) is within 200 ms, and the first opening / closing member 55 is closed during the predetermined condition. Continue state. In other words, when the duration of the locked state exceeds 200 ms, the first opening / closing member 55 changes from the closed state to the open state.

When 200 ms elapses, the controller 77 temporarily stops the DC motor 36 (step S10, horizontal portion T4), and then forwardly rotates the rotating shaft 42 (step S11, horizontal portion T5). By this normal rotation, the cam member 43 returns from the left most rotation position PC2 to the cam initial position PC0.
During the forward rotation of the rotating shaft 42, the controller 77 monitors the lapse of the initial position return time from the start of the forward rotation by the counter means (step S12). (For example, 5 ms), it stops once (step S13, horizontal portion T6). The controller 77 uses the initial position return required time calculating means to calculate the initial position return required time from the actual left / right moving time obtained immediately before at any timing of steps S8 to S10.
If the left / right movement time is X and the initial position return time is Y, they have the following relationship here.
Y = X / 2

Then, the controller 77 reversely rotates the rotating shaft 42 of the DC motor 36 for a short time (for example, 10 ms) (compared to the initial position return time) (step S14, horizontal portion T7).
By this reverse rotation (rotation in the direction opposite to the rotation direction of the rotating shaft 42 when the cam member 43 returns to the cam initial position PC0), the controller 77 further increases the inertia after the stop command of the DC motor 36 (step S13). The moving rotating shaft 42 is braked.
The duration of the reverse rotation commanded by the controller 77 can be determined by the degree of inertia of the DC motor 36 or the like, the temporary stop time immediately before, and the like.
It should be noted that the temporary stop of step S13 and step S14 can be combined to be regarded as a brake.

The controller 77 returns to the cam initial position PC0 accurately by the brake and returns to the initial position P0, and then waits for a relatively long time (for example, 10 s (seconds)). Step S15).
A series of processes in steps S1 to S15 is referred to as a dust removal operation A. In the dust removal operation A, the voltage represented by the horizontal portions T <b> 1 to T <b> 8 in the time chart of FIG. 14 is applied to the DC motor 36 by the controller 77.

The controller 77 performs a dust removal operation B (steps S21 to S35, horizontal portions T11 to T18) that is the same as the dust removal operation A after the end of standby.
In the dust removal operation B, the polarity of the voltage with respect to the DC motor 36 is reversed, and the rotation direction of the DC motor 36 and the movement direction of the cam member 43 are reversed with respect to the dust removal operation A.
In particular, in the dust removal operation B, the controller 77 grasps the time required for the cam member 43 to move from left to right (from the cam left most rotational position PC2 to the cam right most rotational position PC1) as the left / right movement time ( Steps S26 to S28).
Further, in the dust removal operation B, the controller 77 causes the forward rotation (step S34) to be in a reverse rotation relationship with the reverse rotation of the rotary shaft 42 that returns to the initial position P0 from the left by the reverse rotation of the DC motor 36 (step S31). ) To brake.

After completing the dust removal operation B, the controller 77 returns to the beginning of the dust removal operation A, and thereafter repeats the same processing.
In addition, the controller 77 returns the rotating shaft 42 to the initial position P0 when the operation of stopping the dust removal operation is performed at a position other than the initial position P0. At this time, if the DC motor 36 is rotating, the DC motor 36 can be rotated until it is locked and then returned to the initial position P0 by reversely rotating for the initial position return time obtained from the right and left movement time acquired immediately before. .

<Effects of this embodiment>
In the dust collector 1 of the present embodiment, the DC motor 36 and the cam member 43 are used, and a first opening / closing member 55 that can open and close the vent 58 of the intake passage 33 and a first opening and closing member that can open and close the vent 58 of the intake passage 34. The opening / closing member 55 alternately performs the closing operation of the intake passage 33 and the closing operation of the intake passage 34 to remove dust from the left filters 20, 23, 22 and the right filters 20, 23, 22 dust drops can be performed alternately. Therefore, it is possible to clean the left filters 20, 23, 22 and the right filters 20, 23, 22 even during operation of the dust collector 1. Further, since each first opening / closing member 55 and each second opening / closing member 61 are operated by using the DC motor 36 and the cam member 43, no electromagnetic valve is required for the operation of both opening / closing members 55, 61, and the structure of the dust collector 1. Becomes easier.

  Further, the intake passage 33 and the intake passage 34 are closed by one DC motor 36 and one cam member 43 connected to the output shaft 42 of the DC motor 36 via a speed reducer 41. Can be performed alternately, so that the number of DC motors 36 and cam members 43 can be minimized. Accordingly, the manufacturing cost of the dust collector 1 can be suppressed.

  Further, the pair of filters 20, 20 can be arranged in a state in which the increase in the vertical dimension of the dust collector 1 is suppressed without causing interference with the DC motor 36 and each first opening / closing member 55.

  In addition, since the prefilter 20 is subjected to antistatic processing, static electricity can be suppressed from being charged in the prefilter 20. Thereby, since dust adsorb | sucks to the pre filter 20 with static electricity is suppressed, the dust separation of the pre filter 20 becomes favorable.

  In addition, each normal first opening / closing member 55 is connected to the hollow portion 14 on the downstream side of the intake port 52 in the intake passage 33 and on the downstream side of the intake port 53 in the intake passage 34. In the normal state, each of the intake passages 33 and 34 can be opened by providing a ventilation hole 58 between the communication portion 14 and the communication portion 14 and maintaining the ventilation interval. On the other hand, when each first opening / closing member 55 performs the closing operation of the intake passage 33 or the closing operation of the intake passage 34, the intake passages 33, 34 are closed by closing the vent hole 58 and eliminating the ventilation interval. Can be blocked.

  Further, according to the first control example described above, the control can be performed only with the predetermined rotation time of the DC motor 36, so that the dust removal operation can be realized with simple control.

And according to the 2nd control example mentioned above, it has a filter (pre filter 20 and filters 23 and 22), tank 3 which covers the filter, and fan F for introducing outside air into tank 3, In the dust collector 1 that collects dust by ventilating the filter in the forward flow direction, the DC motor 36 for driving the first opening / closing member 55 and the first open / close member 55 for venting the filter in the reverse flow direction is provided. The DC motor 36 is formed to be rotatable from the initial position P0, and uses a brake when returning the DC motor 36 to the initial position P0. Accordingly, the position control of the cam member 43 for operating the first opening / closing member 55 by the DC motor 36 can be made accurate, and the cam member 43 can be reliably returned to the initial position P0 by reliably returning the cam member 43 to the initial position P0. By returning to the cam initial position PC0, it is possible to prevent a situation in which the cam member 43 hits the first opening / closing member 55 and obstructs the ventilation in the forward flow direction, even during the normal dust collecting operation.
Further, by having a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, the air is passed through the filter in the forward flow direction. In the dust collector 1 that collects dust, the filter is provided with a first opening / closing member 55 for venting the filter in a reverse flow direction, and a DC motor 36 for driving the first opening / closing member 55 is provided. It is formed to be rotatable from P0, and the DC motor 36 is controlled to return the DC motor 36 to the initial position P0. Therefore, the position of the cam member 43 for operating the first opening / closing member 55 can always be controlled on the basis of the initial position P0, and appropriate closing by the first opening / closing member 55 via the cam member 43 can be realized. . The initial position P0 is a position where the cam member 43 becomes the cam initial position PC0 and does not come into contact with the first opening / closing member 55, and is controlled so as to return to such an initial position P0. Occasionally, the occurrence of a situation in which the first opening / closing member 55 exerts a blocking action and hinders dust collection can be prevented.
Furthermore, it has a filter (both pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, and vents the filter in the forward flow direction. In the dust collector 1 that collects the dust, a first opening / closing member 55 for venting the filter in the reverse flow direction is provided, and a DC motor 36 for driving the first opening / closing member 55 is provided. The DC motor 36 is formed so as to be rotatable from the initial position P0. The DC motor 36 is rotated in the reverse direction after the DC motor 36 is rotated from the most rotational position (the rightmost rotational position P1 or the leftmost rotational position P2). Therefore, by a simple control of reverse rotation, it is possible to realize a brake of the DC motor 36 or the like that has tried to move or moved due to inertia when the DC motor 36 or the cam member 43 is stopped. As the control is accurate, the dust dropping operation and the dust collecting operation can be appropriately performed.

Further, by having a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, the air is passed through the filter in the forward flow direction. In the dust collector 1 that collects dust, the filter is provided with a first opening / closing member 55 for venting in the reverse flow direction, and a DC motor 36 for driving the first opening / closing member 55. Therefore, an electromagnetic valve is not required for the operation of the first opening / closing member 55, and the first opening / closing member 55 can be reliably closed and opened with a simple configuration. The dust collection operation by the forward flow and the reverse flow direction can be performed. The dust removal operation of the filter by ventilation can be executed reliably.
Furthermore, it has a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, and ventilates the filter in the forward flow direction. In the dust collector 1 that collects dust, a first opening / closing member 55 for venting the filter in the reverse flow direction is provided, and a controller 77 that controls the first opening / closing member 55 to be closed during a predetermined condition is provided. Therefore, the first opening / closing member 55 can be reliably closed for a predetermined time corresponding to the predetermined condition, and may occur when a rotational speed fluctuation occurs in the first control example. It is possible to prevent the situation in which the cleaning state of the filter varies due to a difference in time when the first opening / closing member 55 is closed, and to always sufficiently clean the filter. That.
Furthermore, it has a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, and vents the filter in the forward flow direction. In the dust collector 1 that collects the dust, the first opening / closing member 55 for venting the filter in the reverse flow direction is provided, and the DC motor 36 for opening / closing the first opening / closing member 55 is provided. By detecting this, the DC motor 36 is controlled. Therefore, it is possible to determine the closed state where the first opening / closing member 55 cannot be vented by a simple method of current detection, and it is possible to reliably perform the dust dropping operation and the dust collecting operation of the filter with a simple configuration. .
In addition, it has a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, and vents the filter in the forward flow direction. In the dust collector 1 that collects the dust, the first opening and closing member 55 for venting the filter in the reverse flow direction is provided, and the DC motor 36 for opening and closing the first opening and closing member 55 is provided. A controller 77 is provided for controlling the first opening / closing member 55 to be in a closed state when the DC motor 36 is in an open state and the current value of the DC motor 36 continues for a predetermined time or longer. Therefore, the DC motor 36 is reliably determined to be in a locked state due to the inability to move the cam member 43 that opens and closes the first opening / closing member 55, distinguishing it from other factors such as instantaneous external current fluctuations. Thus, the operation of the first opening / closing member 55 in the closed state (maintenance of the closed state for a predetermined time) can be reliably executed.
Further, by having a filter (pre-filter 20 and filters 23 and 22), a tank 3 covering the filter, and a fan F for introducing outside air into the tank 3, the air is passed through the filter in the forward flow direction. In the dust collector 1 that collects dust, a first opening / closing member 55 for venting the filter in the reverse flow direction is provided, a DC motor 36 for opening / closing the first opening / closing member 55 is provided, and the first opening / closing by the DC motor 36 is provided. The closing operation of the first opening / closing member 55 by the DC motor 36 is stopped at a predetermined time (200 ms) after the closing operation of the member 55 is started. Therefore, the first opening / closing member 55 can be reliably closed during the predetermined time, and the time during which the first opening / closing member 55 is closed due to a factor such as when the rotational speed fluctuates in the first control example. By making a difference, it is possible to prevent a situation where the cleaning state of the filter varies, and to always sufficiently clean the filter.

The controller 77 obtains the time (left-right movement time) required for the rotation of the DC motor 36 from the rightmost rotation position P1 to the leftmost rotation position P2 (or from the leftmost rotation position P2 to the rightmost rotation position P1). Then, since the required time calculated from the time is used when returning to the initial position P0, the return to the initial position P0 can be controlled based on the actual left-right movement time, and the return to the initial position P0 is made current. This can be done reliably. In particular, the return to the initial position P0 can be performed more accurately with respect to the first control example in which the motor drive time is determined in advance.
Further, the controller 77 first closes the right valve and then closes the left valve, and then drops the dust and then closes the left valve and closes the right valve. Alternately. That is, the controller 77 closes the right and left valves that are different in order from the first dust removal operation (right and left) immediately after the first dust removal operation (dust removal operation A) in which the plurality of valves are sequentially closed (right and left). A second dust removing operation (dust removing operation B) for performing the operation is performed, and these are continued as appropriate. Accordingly, it is assumed that a situation where the dust removal operation starts while the DC motor 36 is deviated from the initial position P0 or a situation where the position control changes depending on the total number of the valves after the initial position P0 is closed. In addition, it is possible to suppress variations in the cleaning time in each filter, and it is possible to make the dust dropping state of each filter uniform in a sufficient state.

<Modification example of this embodiment>
The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. For example, a DC motor and a cam member for operating the first opening / closing member 55 of the intake passage 33 and a DC motor and a cam member for operating the first opening / closing member 55 of the intake passage 34 are separately disposed, When the intake passage 33 is closed by the DC motor and the cam member, the first opening / closing member 55 of the intake passage 34 is biased to the position where the vent 58 is opened by the other DC motor and the cam member. You may do it. In addition to the prefilter 20, the paper filter 22 may be subjected to antistatic processing. The filter may be a single layer without a layer structure, or a filter having an increased number of layers. Further, the DC motor 36 may be changed to another motor such as an AC motor. Further, unlike the above-described embodiment, the second opening / closing member and the first opening / closing member are connected in series, and the second opening / closing member opens the intake port of the communication passage in conjunction with the closing operation of the first opening / closing member. You may do it. In addition, unlike the embodiment described above, the cam member 43 may be directly connected to the output shaft 42 of the DC motor 36 having a high torque characteristic as shown in FIG. Thus, for example, by rotating the output shaft 42 of the DC motor 36, the cam member 43 is rotated to the left side, and the DC motor 36 is brought into contact with the inclined wall 57 of the intake passage 33. When the energization is stopped, the first opening / closing member 55 can push the cam member 43 back away from the inclined wall 57 by the pressure of the exhaust gas in the intake passage 33. Therefore, unlike the above-described embodiment, it is not necessary to control the DC member 36 to rotate the cam member 43 rotated to the left side to the right side in order to open the vent hole 58 of the intake passage 33.

Further, in the first control example and the second control example, the order and contents of the processing can be changed as appropriate.
In particular, in the first control example and the second control example, the left filter group may be cleaned first. Also, the initial position P0 may be a position biased to the left or right instead of the left and right midpoints. Furthermore, the dust drop time (the time for closing the vent hole 58 by the first opening / closing member 55 so as not to allow ventilation) and various processing times can be appropriately lengthened or shortened. In addition, the lock state of the DC motor 36 can be grasped by voltage fluctuation (the lock state is set when the voltage value is below a specific threshold value), the rotation speed (the lock state is set when 0, etc.), the cam member 43, and the like. May be performed by a sensor that detects the cam member 43 or the first opening / closing member 55 when the cam right most rotational position PC1 or the cam left most rotational position PC2 is reached.
Further, in the first control example, it is possible not to grasp the lock state of the DC motor 36.
On the other hand, in the second control example, the initial position return time may be calculated by another formula. It is possible to accumulate the past initial position return required time and left / right movement time in the storage means of the controller 77 and use the average or the like for the calculation of the initial position return required time. Also, at the end of the dust removal operation, it is determined whether the dust removal operation A or the dust removal operation B was in progress and stored in the storage means, and the memory is referred to when the next dust removal operation is started. The operation may be changed according to the storage, such as starting from the dust dropping operation B when the operation is finished during the dropping operation B. In addition, either a dust removal operation A or a dust removal operation B can be specified by a switch, and whether the right filter group or only the left filter group is cleaned can be specified by a switch. You may make it do.
Even if the first opening / closing member 55 and the vent 58 are only one type, it is possible to bring the first opening / closing member 55 and the like to an accurate operation by the brake.
As the brake, in addition to the reverse rotation of the rotating shaft 42 immediately after the stop, installation of a locking member that locks the rotating shaft 42 at the initial position P0, the cam member 43 at the cam initial position PC0, or a combination thereof is adopted. be able to.
As a predetermined condition for closing the valve (first opening / closing member 55), it is assumed that the total time during which the DC motor 36 is locked for a plurality of times is within a predetermined time.

  1 .... Dust collector, 3 .... Tank, 4 .... Main body, 8 .... Suction port, 20, 22, 23 ... Filter, 31 ... Electric blower, 33, 34 ... Intake passage, 36 ... DC motor 42 .... DC motor output shaft 43 ... Cam member 44 ... Exhaust passage 50, 51 ... Communication passage 55 ... First opening / closing member (valve) 57 ... Inclined wall 58 ... Inclined wall vents, 59 .... Venting space, 61..Second opening / closing member, 62..Arms, 77..Controller (control means), F..Fan, P0..Initial position, P1..Right The most rotated position (most rotated position), P2, .. the left most rotated position (most rotated position).

Claims (2)

Filters,
A tank covering the filter;
A fan for introducing outside air into the tank;
Have
Collecting dust by venting the filter in the forward flow direction;
In the dust collector,
In order to vent the filter in the reverse flow direction, a valve for closing the vent hole venting in the forward flow direction is provided,
Said valve, DC motor of order is moved to a position closing the vent is provided by a rotary shaft,
After the valve is in the open state does not block the vent, a current value of the DC motor, the DC motor is the rotary shaft despite supplied with electricity by receiving a resistance force rotation precipitator time a value above which exhibits in a state that can not be, if it continues longer than a predetermined time, the valve, characterized in that the control means for controlling so that the closed state of closing the vent is provided. A plurality of the valves are provided,
The rotating shaft of the DC motor is connected to a cam member that can contact a plurality of the valves,
The dust collector according to claim 1 , wherein the DC motor individually opens and closes the plurality of valves via the cam member.

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