Low-frequency vibration auxiliary drill bit based on critical load and drilling machining technology of low-frequency vibration auxiliary drill bit

Abstract

The invention relates to the technical field of mechanical tool machining, in particular to a low-frequency vibration auxiliary drill bit based on critical load and a drilling technology thereof.The low-frequency vibration auxiliary drill bit comprises a base, a supporting plate, a fixing cylinder and a drill bit body, the supporting plate is fixedly connected to one side of the upper surface of the base, the fixing cylinder is slidably connected to one end of the supporting plate, and the drill bit body is installed on the lower surface of the fixing cylinder; a filtering assembly is arranged above the base, through the arrangement of a filtering box, a first water pipe, a second water pipe, a water storage tank and a high-pressure spray head, cutting fluid generated during workpiece machining can be directly recycled, and chippings and other impurities generated due to cutting can be filtered out through layer-by-layer filtering; and the filtered cutting fluid can be directly recycled, so that the waste of the cutting fluid in the processing process is extremely small, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical tool processing, in particular to a low-frequency vibration auxiliary drill bit based on critical load and a drilling process thereof. Background Art

[0002] Hole machining is one of the most important processes in metal cutting. In the traditional drilling process, there are usually problems such as high drilling force, high drilling temperature and difficult chip removal, especially in difficult-to-process materials. These problems are more prominent, especially for small deep holes with large aspect ratios, where hole accuracy is difficult to guarantee and tool life is low, which often leads to low drilling efficiency and increased processing costs. With the continuous new requirements for hole machining quality and efficiency, traditional drilling technology has shown great limitations. In recent years, with the development of society, vibration drilling technology has become more and more mature. It is a controllable vibration of a certain direction, frequency and amplitude applied to the tool or workpiece by a vibration device, which causes regular contact and separation between the drill bit and the workpiece, thereby turning ordinary drilling into intermittent drilling. This intermittent cutting method allows the drill bit to cut in a very short time, and the drill bit and the workpiece are separated for the rest of the time.

[0003] For example, the Chinese patent authorization announcement number CN217252965U discloses a mechanical low-frequency axial vibration drilling device. When the first motor is used for a long time, the second motor is started to rotate the fan blades, and the air inside the fixed cylinder can be extracted through the connecting pipe to form a negative pressure. Then the outside air will continuously enter the fixed cylinder, which can continuously take away the heat, thereby dissipating the heat of the first motor and preventing the first motor from overheating.

[0004] However, the above-mentioned prior art is not convenient for recycling the used cutting fluid during use, which greatly increases the production cost. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the present invention provides a low-frequency vibration-assisted drill bit based on critical load and a drilling process thereof, thereby solving the problem in the prior art that it is inconvenient to recycle the used cutting fluid during use, which greatly increases the production cost.

[0006] The technical solution adopted by the present invention to solve its technical problem is a low-frequency vibration auxiliary drill based on critical load, comprising a base, a support plate, a fixed cylinder and a drill bit, wherein one side of the upper surface of the base is fixedly connected to the support plate, one end of the support plate is slidably connected to the fixed cylinder, and the drill bit is installed on the lower surface of the fixed cylinder, characterized in that: a filter assembly is arranged above the base, and the filter assembly comprises a filter box, a first water pipe, a second water pipe, a water storage tank, a high-pressure nozzle and a water pump installed inside the water storage tank, the filter box is fixedly mounted on the upper surface of the base, the high-pressure nozzle is fixedly mounted on one side of the support plate, and the water storage tank is fixedly mounted on the side of the upper surface of the base away from the filter box, one end of the first water pipe is fixedly connected to an end of the filter box close to the base, and the other end is fixedly connected to a water inlet end of the water pump inside the water storage tank, one end of the second water pipe is fixedly connected to a water outlet end of the water pump inside the water storage tank, and the other end passes through the support plate and is fixedly connected to the high-pressure nozzle; The filter box is a cavity with an opening on the side facing the drill bit, a first filter plate is fixedly connected to the upper inner end of the filter box, a first fixed plate is fixedly installed on the middle of the upper surface of the first filter plate, a clamping mechanism is provided on the upper surface of the first fixed plate, a second filter plate is fixedly connected below the first filter plate, a second fixed plate is fixedly connected to the upper surface of the second filter plate, a first magnetic filter screen, a second magnetic filter screen, a first particle filter screen and a second particle filter screen are fixedly connected in sequence below the second filter plate, and a collecting mechanism is also provided on the inner side of the filter box.

[0007] Preferably, the filtration apertures of the first filter plate, the second filter plate, the first magnetic filter screen, the second magnetic filter screen, the first particle filter screen and the second particle filter screen decrease in sequence.

[0008] Preferably, the clamping mechanism includes vertical plates symmetrically fixedly mounted on both sides of the upper surface of the first fixed plate, the two vertical plates are threadedly connected to threaded rods, the ends of the two threaded rods close to each other are fixedly connected to the clamping plates, and the ends away from each other are fixedly connected to the turning handles.

[0009] Preferably, the collecting mechanism includes a first rack, a second rack, a first push plate, a second push plate, a motor, a gear and a collecting box, the first fixed plate and the second push plate are symmetrically arranged on both sides of the second fixed plate, the first push plate side wall is symmetrically fixedly connected with two first racks that respectively pass through the first fixed plate, the second fixed plate and the second push plate, the second push plate side wall is symmetrically fixedly connected with two second racks that respectively pass through the first fixed plate, the second fixed plate and the first push plate, the bottom of the inner cavity of the first fixed plate and the second fixed plate are respectively fixedly installed with motors between the first rack and the second rack, the output end of the motor is fixedly installed with a gear, and the gear is meshed with the first rack and the second rack.

[0010] Preferably, both sides of the inner cavity of the filter box are slidably connected with collection boxes, the interior of the collection box is a cavity, and a handle is fixedly installed in the middle of the upper surface of the collection box. The two collection boxes are respectively provided with collection ports facing the first push plate and the second push plate. A rotating shaft is rotatably connected between the two sides of the collection port, and a rotating plate is fixedly connected to the circumferential outer wall of the rotating shaft.

[0011] Preferably, the side walls of the first push plate and the second push plate are respectively fixedly connected with a push rod on one side facing the collection box.

[0012] Preferably, the push rod corresponds to the position of the rotating plate.

[0013] A drilling process for a low-frequency vibration-assisted drill bit based on a critical load, the drilling process comprising the following steps: Step 1: Place the workpiece to be processed on the upper surface of the first fixed plate, rotate the threaded rod by turning the handle, and the two threaded rods drive the clamping plates to approach each other to clamp the workpiece on the upper surface of the first fixed plate, and then drill the workpiece through the drill bit; Step 2: When processing the workpiece, the water pump inside the water tank sprays the cutting fluid through the second water pipe and the high-pressure nozzle to cool the workpiece, and the cutting fluid and the debris are filtered through the first filter plate, the second filter plate, the first magnetic filter screen, the second magnetic filter screen, the first particle filter screen and the second particle filter screen in turn. Larger debris will adhere to the upper surfaces of the first filter plate and the second filter plate. After being filtered, the cutting fluid flows into the water tank through the first water pipe; Step three: When it is necessary to clean the debris on the upper surfaces of the first filter plate and the second filter plate, start the motor, the motor drives the gear to rotate, the gear drives the first rack and the second rack engaged therewith to rotate, the first rack and the second rack respectively drive the first push plate and the second push plate to move toward each other, when the push rods of the side walls of the first push plate and the second push plate contact the rotating plates on both sides, they will be pushed and flipped, at this time, the first push plate and the second push plate push the debris on the upper surfaces of the first filter plate and the second filter plate to fall into the collection box through the collection port.

[0014] Beneficial effects of the present invention: (1) In the present invention, the cutting fluid generated by workpiece processing can be directly recovered through the arrangement of the filter box, the first water pipe, the second water pipe, the water storage tank and the high-pressure nozzle. Moreover, the debris and other impurities generated by the cutting can be filtered out through the layers of filtration. The filtered cutting fluid can be directly reused, so that the cutting fluid is wasted very little during the processing, thereby reducing the production cost.

[0015] (2) In the present invention, the arrangement of the first rack, the second rack, the first push plate, the second push plate, the motor, the gear, the collection box and the push rod facilitates the collection of debris, thereby greatly improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a partial structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the filter box of the present invention; Figure 5 It is a schematic diagram of the internal structure of the first fixing plate of the present invention; Figure 6 It is a schematic diagram of the structure of the collecting box of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the collection box of the present invention.

[0018] In the figure: 1. Base; 2. Support plate; 3. Fixed cylinder; 4. Drill bit; 5. Filter assembly; 51. Filter box; 511. First filter plate; 512. First fixed plate; 513. Clamping mechanism; 5131. Vertical plate; 5132. Threaded rod; 5133. Clamping plate; 5134. Turning handle; 514. Second filter plate; 515. Second fixed plate; 516. First magnetic filter screen; 517. Second magnetic filter screen; 518. First particle filter screen; 519. Second particle filter screen; 52. First water pipe; 53. Second water pipe; 54. Water storage tank; 55. High-pressure nozzle; 61. First rack; 62. Second rack; 63. First push plate; 64. Second push plate; 65. Motor; 66. Gear; 67. Collection box; 671. Handle; 672. Collection port; 673. Rotating shaft; 674. Turning plate; 68. Push rod. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the following is a summary of the present invention. The present invention is further described with reference to specific implementation modes.

[0020] like Figures 1 to 7As shown, a preferred embodiment of the present invention proposes a low-frequency vibration auxiliary drill based on critical load, including a base 1, a support plate 2, a fixed cylinder 3 and a drill bit 4, one side of the upper surface of the base 1 is fixedly connected to the support plate 2, one end of the support plate 2 is slidably connected to the fixed cylinder 3, and the drill bit 4 is installed on the lower surface of the fixed cylinder 3. A filter assembly 5 is arranged above the base 1, and the filter assembly 5 includes a filter box 51, a first water pipe 52, a second water pipe 53, a water storage tank 54, a high-pressure nozzle 55 and a water pump installed inside the water storage tank 54. The filter box 51 is fixedly installed on the upper surface of the base 1, the high-pressure nozzle 55 is fixedly installed on one side of the support plate 2, and the water storage tank 54 is fixedly installed on the upper surface of the base 1 away from the filter box 51. One end of the first water pipe 52 is fixedly connected to the end of the filter box 51 close to the base 1, and the other end is fixedly connected to the water inlet end of the water pump inside the water storage tank 54. One end of the second water pipe 53 is fixedly connected to the water outlet end of the water pump inside the water storage tank 54, and the other end passes through the support plate 2 and is fixedly connected to the high-pressure nozzle 55. The filter box 51 is a cavity and has an opening on the side facing the drill bit 4. A first filter plate 511 is fixedly connected to the upper end of the inner side of the filter box 51. A first fixed plate 512 is fixedly installed in the middle of the upper surface of the first filter plate 511. A clamping mechanism 513 is provided on the upper surface of the first fixed plate 512. A second filter plate 514 is fixedly connected to the lower part of the first filter plate 511. A second fixed plate 515 is fixedly connected to the upper surface of the second filter plate 514. A first magnetic filter screen 516, a second magnetic filter screen 517, a first particle filter screen 518 and a second particle filter screen 519 are fixedly connected to the lower part of the second filter plate 514 in sequence. A collecting mechanism is also provided on the inner side of the filter box 51.

[0021] The filtration apertures of the first filter plate 511, the second filter plate 514, the first magnetic filter 516, the second magnetic filter 517, the first particle filter 518 and the second particle filter 519 decrease in sequence. The first filter plate 511 and the second filter plate 514 can filter out larger waste chips to ensure the cleanliness of the cutting fluid. The first magnetic filter 516 and the second magnetic filter 517 can absorb metal impurities in the cutting fluid. The first particle filter 518 and the second particle filter 519 can absorb tiny impurities in the cutting fluid.

[0022] The clamping mechanism 513 includes vertical plates 5131 symmetrically fixedly installed on both sides of the upper surface of the first fixed plate 512. The two vertical plates 5131 are both threadedly connected with threaded rods 5132. The ends of the two threaded rods 5132 that are close to each other are fixedly connected to the clamping plates 5133, and the ends that are away from each other are fixedly connected to the turning handles 5134.

[0023] In the specific implementation process, the workpiece to be processed is placed on the upper surface of the first fixed plate 512, and the threaded rod 5132 is rotated by the turning handle 5134. The two threaded rods 5132 drive the clamping plates 5133 to approach each other so as to clamp the workpiece on the upper surface of the first fixed plate 512. Then, the workpiece can be drilled by the drill bit 4. When the workpiece is processed, the water pump inside the water tank 54 sprays the cutting fluid through the second water pipe 53 and the high-pressure nozzle 55 to cool the workpiece. The cutting fluid and the debris pass through the first filter plate 511, the second filter plate 514, the first magnetic filter screen 516, the second magnetic filter screen 517, The first particle filter 518 and the second particle filter 519 are used for filtering, and larger debris will adhere to the upper surfaces of the first filter plate 511 and the second filter plate 514. After being filtered, the cutting fluid flows into the water tank through the first water pipe 52. Through the arrangement of the filter box 51, the first water pipe 52, the second water pipe 53, the water tank 54 and the high-pressure nozzle 55, the cutting fluid generated by the workpiece processing can be directly recovered, and the debris and other impurities generated by the cutting can be filtered out through layer by layer filtering. The filtered cutting fluid can be directly reused, so that the cutting fluid is wasted very little during the processing process, thereby reducing the production cost.

[0024] The collecting mechanism includes a first rack 61, a second rack 62, a first push plate 63, a second push plate 64, a motor 65, a gear 66 and a collecting box 67. The first push plate 63 and the second push plate 64 are symmetrically arranged on both sides of the first fixed plate 512 and the second fixed plate 515. The side wall of the first push plate 63 is symmetrically fixedly connected with two first racks 61 that respectively penetrate the first fixed plate 512, the second fixed plate 515 and the second push plate 64. The side wall of the second push plate 64 is symmetrically fixedly connected with two second racks 62 that respectively penetrate the first fixed plate 512, the second fixed plate 515 and the first push plate 63. The bottom of the inner cavity of the first fixed plate 512 and the second fixed plate 515 are respectively fixedly installed with motors 65 between the first rack 61 and the second rack 62. The output end of the motor 65 is fixedly installed with a gear 66, which meshes with the first rack 61 and the second rack 62.

[0025] Collection boxes 67 are slidably connected to both sides of the inner cavity of the filter box 51. The interior of the collection box 67 is a cavity. A handle 671 is fixedly installed in the middle of the upper surface of the collection box 67. The two collection boxes 67 are respectively provided with collection ports 672 facing the first push plate 63 and the second push plate 64. A rotating shaft 673 is rotatably connected between the two sides of the collection port 672, and a rotating plate 674 is fixedly connected to the circumferential outer wall of the rotating shaft 673.

[0026] A push rod 68 is fixedly connected to the side walls of the first push plate 63 and the second push plate 64 facing the collecting box 67 .

[0027] The positions of the push rod 68 and the rotating plate 674 correspond.

[0028] During the specific implementation process, when it is necessary to clean the debris on the upper surfaces of the first filter plate 511 and the second filter plate 514, the motor 65 is started, and the motor 65 drives the gear 66 to rotate, and the gear 66 drives the first rack 61 and the second rack 62 engaged therewith to rotate, and the first rack 61 and the second rack 62 respectively drive the first push plate 63 and the second push plate 64 to move toward each other, and when the push rods 68 of the side walls of the first push plate 63 and the second push plate 64 contact the rotating plates 674 on both sides, they will be pushed and flipped, and at this time, the first push plate 63 and the second push plate 64 push the debris on the upper surfaces of the first filter plate 511 and the second filter plate 514 to fall into the collection box 67 through the collecting port 672, which facilitates the collection of debris and greatly improves work efficiency.

[0029] Embodiment 2: This embodiment provides a drilling process of a low-frequency vibration-assisted drill bit based on a critical load. The low-frequency vibration-assisted drill bit based on a critical load mentioned in this embodiment is the drill bit in Embodiment 1.

[0030] A drilling process of a low-frequency vibration-assisted drill bit based on critical load, comprising the following steps: Step 1: Place the workpiece to be processed on the upper surface of the first fixed plate 512, and rotate the threaded rod 5132 by turning the handle 5134. The two threaded rods 5132 drive the clamping plates 5133 to approach each other, thereby clamping the workpiece on the upper surface of the first fixed plate 512, and then the workpiece can be drilled by the drill bit 4; Step 2: When processing the workpiece, the water pump inside the water tank 54 sprays the cutting fluid through the second water pipe 53 and the high-pressure nozzle 55 to cool the workpiece, and the cutting fluid and the debris are filtered through the first filter plate 511, the second filter plate 514, the first magnetic filter screen 516, the second magnetic filter screen 517, the first particle filter screen 518 and the second particle filter screen 519 in sequence. Larger debris will adhere to the upper surfaces of the first filter plate 511 and the second filter plate 514. After being filtered, the cutting fluid flows into the water tank 54 through the first water pipe 52; Step three: When it is necessary to clean the debris on the upper surfaces of the first filter plate 511 and the second filter plate 514, start the motor 65, the motor 65 drives the gear 66 to rotate, the gear 66 drives the first rack 61 and the second rack 62 meshing therewith to rotate, the first rack 61 and the second rack 62 respectively drive the first push plate 63 and the second push plate 64 to move toward each other, when the push rods 68 on the side walls of the first push plate 63 and the second push plate 64 contact the rotating plates 674 on both sides, they will be pushed and flipped, at this time, the first push plate 63 and the second push plate 64 push the debris on the upper surfaces of the first filter plate 511 and the second filter plate 514 to fall into the collection box 67 through the collecting port 672.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-frequency vibration-assisted drill bit (4) based on a critical load, comprising a base (1), a support plate (2), a fixing cylinder (3) and a drill bit (4), wherein one side of the upper surface of the base (1) is fixedly connected to the support plate (2), one end of the support plate (2) is slidably connected to the fixing cylinder (3), and the drill bit (4) is mounted on the lower surface of the fixing cylinder (3); the characteristics are: A filter assembly (5) is arranged above the base (1), and the filter assembly (5) comprises a filter box (51), a first water pipe (52), a second water pipe (53), a water storage tank (54), a high-pressure nozzle (55), and a water pump installed inside the water storage tank (54); the filter box (51) is fixedly mounted on the upper surface of the base (1); the high-pressure nozzle (55) is fixedly mounted on one side of the support plate (2); the water storage tank is fixedly mounted on the upper surface of the base (1) on a side away from the filter box (51); one end of the first water pipe (52) is fixedly connected to an end of the filter box (51) close to the base (1), and the other end is fixedly connected to a water inlet end of a water pump inside the water storage tank (54); one end of the second water pipe (53) is fixedly connected to a water outlet end of a water pump inside the water storage tank (54), and the other end passes through the support plate (2) and is fixedly connected to the high-pressure nozzle (55); The filter box (51) is a hollow cavity and has an opening on the side facing the drill bit (4). A first filter plate (511) is fixedly connected to the upper end of the inner side of the filter box (51). A first fixing plate (512) is fixedly mounted in the middle of the upper surface of the first filter plate (511). A clamping mechanism (513) is provided on the upper surface of the first fixing plate (512). A second filter plate (514) is fixedly connected below the first filter plate (511). A second fixing plate (515) is fixedly connected to the upper surface of the second filter plate (514). A first magnetic filter screen (516), a second magnetic filter screen (517), a first particle filter screen (518) and a second particle filter screen (519) are fixedly connected below the second filter plate (514) in sequence. A collecting mechanism is also provided on the inner side of the filter box (51).

2. A low-frequency vibration-assisted drill bit (4) based on critical load according to claim 1, characterized in that: The filter apertures of the first filter plate (511), the second filter plate (514), the first magnetic filter screen (516), the second magnetic filter screen (517), the first particle filter screen (518), and the second particle filter screen (519) decrease in sequence.

3. A critical load-based low-frequency vibration-assisted drill bit (4) according to claim 2, characterized in that: The clamping mechanism (513) comprises vertical plates (5131) symmetrically fixedly mounted on both sides of the upper surface of the first fixed plate (512); the two vertical plates (5131) are both threadedly connected to threaded rods (5132); the ends of the two threaded rods (5132) that are close to each other are both fixedly connected to the clamping plates (5133), and the ends that are away from each other are both fixedly connected to the turning handles (5134).

4. A low-frequency vibration-assisted drill bit (4) based on critical load according to claim 3, characterized in that: The collecting mechanism comprises a first rack (61), a second rack (62), a first push plate (63), a second push plate (64), a motor (65), a gear (66) and a collecting box (67); the first push plate (63) and the second push plate (64) are symmetrically arranged on both sides of the first fixed plate (512) and the second fixed plate (515); the side wall of the first push plate (63) is symmetrically fixedly connected with two first racks (61) respectively penetrating the first fixed plate (512), the second fixed plate (515) and the second push plate (64). The side wall of the second push plate (64) is symmetrically fixedly connected with two second racks (62) that respectively penetrate the first fixed plate (512), the second fixed plate (515) and the first push plate (63); the bottom of the inner cavity of the first fixed plate (512) and the second fixed plate (515) is respectively located between the first rack (61) and the second rack (62) and a motor (65) is fixedly installed; the output end of the motor (65) is fixedly installed with a gear (66), and the gear (66) is meshed with the first rack (61) and the second rack (62).

5. The low-frequency vibration-assisted drill bit (4) based on critical load according to claim 3, characterized in that: Collection boxes (67) are slidably connected to both sides of the inner cavity of the filter box (51); the interior of the collection box (67) is a hollow cavity; a handle (671) is fixedly mounted in the middle of the upper surface of the collection box (67); the two collection boxes (67) are respectively provided with collection ports (672) facing the first push plate (63) and the second push plate (64); a rotating shaft (673) is rotatably connected between the two sides of the collection port (672); and a rotating plate (674) is fixedly connected to the circumferential outer wall of the rotating shaft (673).

6. A low-frequency vibration-assisted drill bit (4) based on critical load according to claim 4, characterized in that: A push rod (68) is fixedly connected to the side walls of the first push plate (63) and the second push plate (64) facing the collecting box (67).

7. The low-frequency vibration-assisted drill bit (4) based on critical load according to claim 5, characterized in that: The push rod (68) and the rotating plate (674) are located in corresponding positions.

8. A drilling process using a low-frequency vibration-assisted drill bit (4) based on a critical load, characterized in that: The method comprises a low-frequency vibration-assisted drill bit (4) based on critical load according to any one of claims 1 to 7, and further comprises the following steps: Step 1: Place the workpiece to be processed on the upper surface of the first fixed plate (512), rotate the threaded rod (5132) by using the turning handle (5134), and the two threaded rods (5132) drive the clamping plates (5133) to move closer to each other, thereby clamping the workpiece on the upper surface of the first fixed plate (512), and then drill the workpiece using the drill bit (4); Step 2: When processing a workpiece, the water pump inside the water storage tank (54) sprays the cutting fluid through the second water pipe (53) and the high-pressure nozzle (55) to cool the workpiece, and the cutting fluid and the debris are filtered through the first filter plate (511), the second filter plate (514), the first magnetic filter screen (516), the second magnetic filter screen (517), the first particle filter screen (518) and the second particle filter screen (519) in sequence. Larger debris will adhere to the upper surfaces of the first filter plate (511) and the second filter plate (514). After being filtered, the cutting fluid flows into the water storage tank through the first water pipe (52); Step 3: When it is necessary to clean the debris on the upper surfaces of the first filter plate (511) and the second filter plate (514), the motor (65) is started, and the motor (65) drives the gear (66) to rotate. The gear (66) drives the first rack (61) and the second rack (62) meshed therewith to rotate. The first rack (61) and the second rack (62) respectively drive the first push plate (63) and the second push plate (64) to move towards each other. When the push rods (68) on the side walls of the first push plate (63) and the second push plate (64) contact the rotating plates (674) on both sides, they are pushed and turned over. At this time, the first push plate (63) and the second push plate (64) push the debris on the upper surfaces of the first filter plate (511) and the second filter plate (514) through the collecting port (672) and fall into the collecting box (67).

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