Miniature mold polishing machine capable of automatically collecting dust

Abstract

The utility model relates to the field of polishing machines, in particular to a miniature mold polishing machine capable of automatically collecting dust, which comprises a working platform, supporting legs, a mounting component, a polishing component, a moving component, a clamping component, a rotating component and a dust collecting component, the multiple sets of supporting legs are arranged on the bottom face of the working platform, the mounting assembly is arranged on the top face of the working platform, the grinding assembly is arranged in the mounting assembly, the moving assembly is arranged in the mounting assembly, the moving assembly is arranged below the grinding assembly, and the clamping assembly is arranged above the moving assembly. The rotating assembly is arranged in the clamping assembly, and the dust collection assembly is arranged on one side of the grinding assembly. According to the polishing machine, by arranging the position-adjustable dust removal structure and the dust removal opening structure surrounding the structure, dust generated by the polishing machine can be accurately removed, the dust removal efficiency is improved, the structure is simple, and the use cost is low.

Description

Technical Field

[0001] The utility model relates to the field of polishing machines, in particular to a micro-mould polishing machine capable of automatically suctioning dust. Background Art

[0002] The micro mold polishing machine is a device used to polish micro molds; it is manufactured with advanced technology and high-quality materials, and can provide effective and high-quality polishing effects; this machine has a compact design and efficient performance, and can complete the polishing task in a short time; it is simple and convenient to operate, and is suitable for various types and sizes of micro molds; in addition, it also has the function of adjustable speed and pressure to meet various polishing needs; the micro mold polishing machine is manufactured with advanced technology, and can provide high-quality polishing effects; it has a compact design and efficient performance, and can complete the polishing task in a short time; in addition, it also has the function of adjustable speed and pressure to meet various polishing needs; it is suitable for various types and sizes of micro molds, and is simple and convenient to operate; when increasing the dust removal efficiency of the dust removal structure on the polishing machine, a higher-power dust suction structure is used to increase the dust removal efficiency. On the one hand, the higher-power dust suction structure is more expensive, and on the other hand, it consumes more energy and has a high cost of use. Utility Model Content

[0003] In order to overcome the problem of increasing the dust removal efficiency of the dust removal structure on the polishing machine, a higher power dust suction structure is used to increase the dust removal efficiency. On the one hand, the higher power dust suction structure is more expensive, and on the other hand, it consumes more energy and has a high cost.

[0004] The technical solution of the utility model is: a micro-mold polishing machine with automatic dust collection, comprising a working platform, supporting legs, a mounting assembly, a grinding assembly, a moving assembly, a clamping assembly, a rotating assembly and a dust collection assembly; the supporting legs are arranged in multiple groups, the supporting legs are arranged on the bottom surface of the working platform, the mounting assembly is arranged on the top surface of the working platform, the grinding assembly is arranged inside the mounting assembly, the moving assembly is arranged inside the mounting assembly, the moving assembly is arranged below the grinding assembly, the clamping assembly is arranged above the moving assembly, the rotating assembly is arranged inside the clamping assembly, and the dust collection assembly is arranged on one side of the grinding assembly.

[0005] Preferably, the working platform can be supported by setting supporting legs, the grinding component, moving component and dust collection component can be installed and fixed by setting an installation component, the micro mold can be polished by setting the grinding component, the clamping component and the rotating component can be driven to move by setting the moving component, the micro mold can be clamped by setting the clamping component, the micro mold can be driven to rotate by setting the rotating component, and automatic dust collection can be achieved by setting the dust collection component.

[0006] Preferably, the mounting assembly includes a mounting frame and a lifting and telescopic rod. The mounting frame is arranged on the top surface of the working platform, the mounting frame is fixedly connected to the working platform, the lifting and telescopic rod is arranged inside the mounting frame, and one end of the lifting and telescopic rod is fixedly connected to the inner top surface of the mounting frame. When in use, the grinding assembly, the moving assembly and the dust collection assembly can be installed and fixed by setting the mounting frame, and the grinding assembly can be driven to rise and fall by setting the lifting and telescopic rod.

[0007] Preferably, the grinding assembly includes a grinding motor, a motor box, a connecting shaft and a grinding head. The other end of the lifting and telescopic rod is fixedly connected to the motor box, the grinding motor is arranged inside the motor box, and the grinding head is arranged below the motor box. One end of the connecting shaft is fixedly connected to the output end of the grinding motor, and the other end of the connecting shaft is fixedly connected to the grinding head. When in use, the grinding motor can be installed by setting the motor box. By setting the grinding motor, the grinding head can be driven to rotate through the connecting shaft, so that the micro mold can be polished.

[0008] Preferably, the moving assembly includes a moving motor, a moving screw, a limiting rod and a moving seat. The moving motor is arranged on one side of the mounting frame, the moving screw is arranged inside the mounting frame, one end of the moving screw is fixedly connected to the output end of the moving motor, and the other end of the moving screw is rotatably connected to the inner side wall of the mounting frame, the limiting rod is arranged on one side of the moving screw, the moving seat is threadedly connected to the moving screw, and the moving seat is slidably connected to the limiting rod. When in use, the moving motor can be used to drive the moving screw to rotate, the moving seat is threadedly connected to the moving screw, and under the limiting action of the limiting rod, when the moving screw rotates, the moving seat moves.

[0009] Preferably, the clamping assembly includes a clamping motor, a clamping screw and a clamping plate. The clamping motor is arranged on one side of the moving seat. A mounting groove is provided on the top surface of the moving seat. The clamping screw is arranged inside the mounting groove. Two groups of threads in opposite directions are provided on the clamping screw. The clamping plates are arranged in two groups. The clamping plates are arranged above the moving seat. The clamping plates are threadedly connected to the clamping screw. When in use, the clamping motor can be used to drive the clamping screw to rotate. The clamping screw is threadedly connected to the two groups of clamping plates through two groups of threads in opposite directions, and the mounting groove limits the clamping plate, so that the rotation of the clamping screw drives the two groups of clamping plates to move in the opposite direction.

[0010] Preferably, the rotating assembly includes a rotating motor, a rotating shaft and a rotating plate. The rotating motor is arranged on one side of the clamping plate. The rotating plate is arranged in two groups. The rotating plate is arranged between the two groups of clamping plates. The rotating shaft is arranged in two groups. One end of the rotating shaft is fixedly connected to the clamping plate, and the other end of the rotating shaft is rotatably connected to the rotating plate. When in use, the rotating motor can be used to drive the rotating shaft to rotate, and the rotating shaft drives the rotating plate to rotate. At the same time, the two groups of rotating plates can be used to clamp the micro mold, thereby driving the micro mold to rotate, thereby driving the micro mold to move and rotate, and in conjunction with the lifting and telescopic rod, the grinding head can be used to fully grind the side wall of the micro mold, which saves time and effort and is simple to operate.

[0011] Preferably, the dust suction assembly includes a water tank, a dust suction pump, a connecting pipe and a dust removal hood. The water tank is arranged on the top surface of the mounting frame, the dust suction pump is arranged on the top surface of the water tank, the dust suction pump is connected to the water tank, one end of the connecting pipe passes through the top surface of the water tank to the inside of the water tank, and the other end of the connecting pipe is connected to the dust removal hood. A connecting rod is arranged on the side wall of the connecting pipe. The connecting rod is arranged in multiple groups, and the multiple groups of connecting rods are connected by damping hinges. An arc-shaped opening is opened on the side wall of the dust removal hood. When in use, negative pressure can be generated inside the water tank by arranging the dust suction pump, thereby A negative pressure is generated in the dust hood through the connecting pipe, so that the dust can be absorbed and removed by the dust hood, and the water in the water tank can absorb the dust to prevent the dust from entering the dust pump and affecting the normal operation of the dust pump, and the connecting pipe can be bent arbitrarily by setting the cooperation of the connecting rod and the damping hinge, and the grinding head and the micro mold can be surrounded by the arc opening on the dust hood, so that the dust hood can be aligned with the grinding head for precise dust removal, and the dust removal effect is better, and when the micro mold is taken and placed, the dust hood can be lifted without affecting the operation.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the prior art, when increasing the dust removal efficiency of the dust removal structure on the polishing machine, a dust suction structure with a higher power is used to increase the dust removal efficiency. The dust suction structure with a higher power is more expensive on the one hand, and consumes more energy on the other hand, and the use cost is high; the polishing machine is provided with a dust removal structure with adjustable position and a dust removal port structure of the surrounding structure, so that the dust generated by the polishing machine can be accurately removed, the dust removal efficiency is increased, and the structure is simple and the use cost is low;

[0014] 2. By setting up a dust suction pump, negative pressure can be generated inside the water tank, thereby generating negative pressure in the dust hood through the connecting pipe, so that the dust can be absorbed and removed by the dust hood, and the water in the water tank can absorb the dust to prevent dust from entering the dust suction pump and affecting the normal operation of the dust suction pump. By setting up the cooperation of the connecting rod and the damping hinge, the connecting pipe can be bent at will, and the arc opening on the dust hood can be used to surround the grinding head and the micro mold, so that the dust hood can be aligned with the grinding head for precise dust removal, and the dust removal effect is better. When taking and placing the micro mold, the dust hood can be lifted without affecting the operation;

[0015] 3. By setting a moving motor, the moving screw can be driven to rotate. The moving seat is threadedly connected to the moving screw, and under the limiting action of the limiting rod, when the moving screw rotates, the moving seat moves. By setting a clamping motor, the clamping screw can be driven to rotate. The clamping screw is threadedly connected to the two sets of clamping plates through two sets of threads in opposite directions, and the mounting groove limits the clamping plates, so that the rotation of the clamping screw drives the two sets of clamping plates to move in the opposite direction. By setting a rotating motor, the rotating shaft can be driven to rotate, and the rotating shaft drives the rotating plate to rotate. At the same time, the two sets of rotating plates can be used to clamp the micro mold, thereby driving the micro mold to rotate, thereby driving the micro mold to move and rotate, and in conjunction with the lifting and telescopic rod, the grinding head can be used to fully grind the side wall of the micro mold, which saves time and effort and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The three-dimensional structure diagram of the micro mold polishing machine capable of automatic dust collection of the utility model is shown;

[0017] Figure 2 The following is a schematic diagram of the three-dimensional structure of the micro-mold polishing machine capable of automatic dust collection according to the present invention;

[0018] Figure 3 The present invention is a schematic diagram of the cross-sectional three-dimensional structure of a micro-mold polishing machine capable of automatic dust collection;

[0019] Figure 4 Another cross-sectional three-dimensional structural schematic diagram of the micro-mold polishing machine capable of automatic dust collection of the present utility model is shown;

[0020] Explanation of the accompanying drawings: 1. working platform; 2. supporting legs; 3. mounting assembly; 4. grinding assembly; 5. moving assembly; 6. clamping assembly; 7. rotating assembly; 8. dust suction assembly; 301. mounting frame; 302. lifting and telescopic rod; 401. grinding motor; 402. motor box; 403. connecting shaft; 404. grinding head; 501. moving motor; 502. moving screw; 503. limiting rod; 504. moving seat; 601. clamping motor; 602. clamping screw; 603. clamping plate; 701. rotating motor; 702. rotating shaft; 703. rotating plate; 801. water tank; 802. dust suction pump; 803. connecting pipe; 804. dust hood; 805. connecting rod. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1-2 The utility model provides an embodiment: a micro mold polishing machine with automatic dust collection, comprising a working platform 1, supporting legs 2, a mounting assembly 3, a grinding assembly 4, a moving assembly 5, a clamping assembly 6, a rotating assembly 7 and a dust collection assembly 8; the supporting legs 2 are arranged in multiple groups, the supporting legs 2 are arranged on the bottom surface of the working platform 1, the mounting assembly 3 is arranged on the top surface of the working platform 1, the grinding assembly 4 is arranged inside the mounting assembly 3, the moving assembly 5 is arranged inside the mounting assembly 3, the moving assembly 5 is arranged below the grinding assembly 4, the clamping assembly 6 is arranged above the moving assembly 5, the rotating assembly 7 is arranged inside the clamping assembly 6, and the dust collection assembly 8 is arranged on one side of the grinding assembly 4.

[0023] See also Figure 3In this embodiment, the mounting assembly 3 includes a mounting frame 301 and a lifting telescopic rod 302. The mounting frame 301 is arranged on the top surface of the working platform 1, and the mounting frame 301 is fixedly connected to the working platform 1. The lifting telescopic rod 302 is arranged inside the mounting frame 301, and one end of the lifting telescopic rod 302 is fixedly connected to the inner top surface of the mounting frame 301. When in use, the grinding assembly 4, the moving assembly 5 and the dust collection assembly 8 can be installed and fixed by setting the mounting frame 301, and the lifting telescopic rod 302 is arranged. The grinding assembly 4 can be driven to lift, and the grinding assembly 4 includes a grinding motor 401, a motor box 402, a connecting shaft 403 and a grinding head 404. The other end of the lifting telescopic rod 302 is fixedly connected to the motor box 402, the grinding motor 401 is arranged inside the motor box 402, and the grinding head 404 is arranged below the motor box 402. One end of the connecting shaft 403 is fixedly connected to the output end of the grinding motor 401, and the other end of the connecting shaft 403 is fixedly connected to the grinding head 404. When in use, by setting the motor The box 402 can be used to install the grinding motor 401. The grinding motor 401 can be used to drive the grinding head 404 to rotate through the connecting shaft 403, so that the micro mold can be polished. The moving component 5 includes a moving motor 501, a moving screw 502, a limiting rod 503 and a moving seat 504. The moving motor 501 is arranged on one side of the mounting frame 301, and the moving screw 502 is arranged inside the mounting frame 301. One end of the moving screw 502 is fixedly connected to the output end of the moving motor 501. The other end of the movable screw 502 is rotatably connected to the inner side wall of the mounting frame 301, the limiting rod 503 is arranged on one side of the movable screw 502, the movable seat 504 is threadedly connected to the movable screw 502, and the movable seat 504 is slidably connected to the limiting rod 503. When in use, the movable screw 502 can be driven to rotate by setting a movable motor 501, the movable seat 504 is threadedly connected to the movable screw 502, and under the limiting action of the limiting rod 503, when the movable screw 502 rotates, the movable seat 504 moves.

[0024] See also Figure 4In this embodiment, the clamping assembly 6 includes a clamping motor 601, a clamping screw 602 and a clamping plate 603. The clamping motor 601 is arranged on one side of the moving seat 504. A mounting groove is provided on the top surface of the moving seat 504. The clamping screw 602 is arranged inside the mounting groove. Two groups of threads in opposite directions are provided on the clamping screw 602. The clamping plate 603 is arranged in two groups. The clamping plate 603 is arranged above the moving seat 504. The clamping plate 603 is threadedly connected with the clamping screw 602. When in use, the clamping motor 601 can be provided to drive the clamping screw 602 to rotate. The clamping screw 602 is threadedly connected with the two groups of clamping plates 603 through two groups of threads in opposite directions, and the mounting groove limits the clamping plate 603, so that The clamping screw 602 rotates to drive the two groups of clamping plates 603 to move in the opposite direction. The rotating component 7 includes a rotating motor 701, a rotating shaft 702 and a rotating plate 703. The rotating motor 701 is arranged on one side of the clamping plate 603, and the rotating plate 703 is arranged in two groups. The rotating plate 703 is arranged between the two groups of clamping plates 603. The rotating shaft 702 is arranged in two groups. One end of the rotating shaft 702 is fixedly connected to the clamping plate 603, and the other end of the rotating shaft 702 is rotatably connected to the rotating plate 703. When in use, the rotating motor 701 can be arranged to drive the rotating shaft 702 to rotate, and the rotating shaft 702 drives the rotating plate 703 to rotate. At the same time, the two groups of rotating plates 703 can be used to clamp the micro mold, thereby driving the micro mold. The micro mold can be rotated to drive it to move and rotate, and the grinding head 404 can be used to fully grind the side wall of the micro mold in conjunction with the lifting and telescopic rod 302, which saves time and effort and is easy to operate. The dust suction component 8 includes a water tank 801, a dust suction pump 802, a connecting pipe 803 and a dust cover 804. The water tank 801 is arranged on the top surface of the mounting frame 301, and the dust suction pump 802 is arranged on the top surface of the water tank 801. The dust suction pump 802 is connected to the water tank 801 through-connection, one end of the connecting pipe 803 passes through the top surface of the water tank 801 to the inside of the water tank 801, and the other end of the connecting pipe 803 is connected to the dust cover 804 through-connection, and a connecting rod 805 is arranged on the side wall of the connecting pipe 803. 5 is arranged into multiple groups, and the multiple groups of connecting rods 805 are connected by damping hinges. An arc-shaped opening is opened on the side wall of the dust cover 804. When in use, a vacuum pump 802 can be arranged to generate negative pressure inside the water tank 801, thereby generating negative pressure in the dust cover 804 through the connecting pipe 803, so that the dust can be absorbed and removed by the dust cover 804, and the dust can be absorbed by the water in the water tank 801 to prevent the dust from entering the dust pump 802 and affecting the normal operation of the dust pump 802. The connection pipe 803 can be bent arbitrarily by arranging the connection rod 805 and the damping hinge, and the grinding head 404 and the micro mold can be surrounded by the arc-shaped opening on the dust cover 804.The dust hood is aligned with the grinding head 404 for accurate dust removal, and the dust removal effect is better. When the micro mold is taken and placed, the dust hood can be lifted without affecting the operation.

[0025] When working, the grinding assembly 4, the moving assembly 5 and the dust collecting assembly 8 are installed and fixed by the mounting frame 301, and the grinding assembly 4 is driven to move up and down by the lifting and telescopic rod 302;

[0026] The grinding motor 401 is installed by using the motor box 402, and the grinding motor 401 drives the grinding head 404 to rotate through the connecting shaft 403, so as to grind the micro mold;

[0027] The moving motor 501 is used to drive the moving screw 502 to rotate, and the moving seat 504 is threadedly connected with the moving screw 502. Under the limiting action of the limiting rod 503, when the moving screw 502 rotates, the moving seat 504 moves. The clamping motor 601 is used to drive the clamping screw 602 to rotate. The clamping screw 602 is threadedly connected with the two groups of clamping plates 603 through two groups of threads in opposite directions, and the mounting groove limits the clamping plates 603, so that the rotation of the clamping screw 602 drives the two groups of clamping plates 603 to move in the opposite direction. The rotating motor 701 is used to drive the rotating shaft 702 to rotate, and the rotating shaft 702 drives the rotating plate 703 to rotate. At the same time, the two groups of rotating plates 703 are used to clamp the micro mold, so as to realize driving the micro mold to rotate, thereby driving the micro mold to move and rotate, and the grinding head 404 is used in conjunction with the lifting telescopic rod 302 to fully grind the side wall of the micro mold, which saves time and effort and is simple to operate.

[0028] The dust pump 802 is used to generate negative pressure inside the water tank 801, thereby generating negative pressure in the dust hood 804 through the connecting pipe 803, so that the dust is absorbed and removed by the dust hood 804, and the dust is absorbed by the water in the water tank 801 to prevent the dust from entering the dust pump 802 and affecting the normal operation of the dust pump 802. The connecting rod 805 and the damping hinge are used to cooperate to realize the arbitrary bending of the connecting pipe 803, and the arc-shaped opening on the dust hood 804 is used to surround the grinding head 404 and the micro mold, so that the dust hood is aligned with the grinding head 404 for precise dust removal, and the dust removal effect is better. When the micro mold is taken and placed, the dust hood is lifted without affecting the operation.

[0029] Through the above steps, the working platform 1 is supported by the supporting legs 2, the grinding component 4, the moving component 5 and the dust collection component 8 are installed and fixed by the installation component 3, the micro mold is ground by the grinding component 4, the moving component 5 is used to drive the clamping component 6 and the rotating component 7 to move, the micro mold is clamped by the clamping component 6, the micro mold is rotated by the rotating component 7, and automatic dust collection is achieved by the dust collection component 8.

[0030] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A micro mold polishing machine capable of automatic dust collection, comprising a working platform (1); characterized in that: The invention also comprises a supporting leg (2), a mounting assembly (3), a grinding assembly (4), a moving assembly (5), a clamping assembly (6), a rotating assembly (7) and a dust collecting assembly (8); the supporting leg (2) is arranged in a plurality of groups, the supporting leg (2) is arranged on the bottom surface of the working platform (1), the mounting assembly (3) is arranged on the top surface of the working platform (1), the grinding assembly (4) is arranged inside the mounting assembly (3), the moving assembly (5) is arranged inside the mounting assembly (3), the moving assembly (5) is arranged below the grinding assembly (4), the clamping assembly (6) is arranged above the moving assembly (5), the rotating assembly (7) is arranged inside the clamping assembly (6), and the dust collecting assembly (8) is arranged on one side of the grinding assembly (4).

2. The micro mold polishing machine capable of automatic dust collection according to claim 1, characterized in that: The mounting assembly (3) comprises a mounting frame (301) and a lifting and telescopic rod (302); the mounting frame (301) is arranged on the top surface of the working platform (1); the mounting frame (301) is fixedly connected to the working platform (1); the lifting and telescopic rod (302) is arranged inside the mounting frame (301); one end of the lifting and telescopic rod (302) is fixedly connected to the inner top surface of the mounting frame (301).

3. The micro mold polishing machine capable of automatic dust collection according to claim 2, characterized in that: The grinding assembly (4) comprises a grinding motor (401), a motor box (402), a connecting shaft (403) and a grinding head (404); the other end of the lifting and telescopic rod (302) is fixedly connected to the motor box (402); the grinding motor (401) is arranged inside the motor box (402); the grinding head (404) is arranged below the motor box (402); one end of the connecting shaft (403) is fixedly connected to the output end of the grinding motor (401); and the other end of the connecting shaft (403) is fixedly connected to the grinding head (404).

4. The micro mold polishing machine capable of automatic dust collection according to claim 3, characterized in that: The moving assembly (5) comprises a moving motor (501), a moving lead screw (502), a limiting rod (503) and a moving seat (504); the moving motor (501) is arranged on one side of the mounting frame (301); the moving lead screw (502) is arranged inside the mounting frame (301); one end of the moving lead screw (502) is fixedly connected to the output end of the moving motor (501); the other end of the moving lead screw (502) is rotatably connected to the inner side wall of the mounting frame (301); the limiting rod (503) is arranged on one side of the moving lead screw (502); the moving seat (504) is threadedly connected to the moving lead screw (502); and the moving seat (504) is slidably connected to the limiting rod (503).

5. The micro mold polishing machine capable of automatic dust collection according to claim 4, characterized in that: The clamping assembly (6) comprises a clamping motor (601), a clamping lead screw (602) and a clamping plate (603). The clamping motor (601) is arranged on one side of the movable seat (504). A mounting groove is provided on the top surface of the movable seat (504). The clamping lead screw (602) is arranged inside the mounting groove. Two groups of threads in opposite directions are provided on the clamping lead screw (602). The clamping plate (603) is arranged in two groups. The clamping plate (603) is arranged above the movable seat (504). The clamping plate (603) is threadedly connected to the clamping lead screw (602).

6. The micro mold polishing machine capable of automatic dust collection according to claim 5, characterized in that: The rotating assembly (7) comprises a rotating motor (701), a rotating shaft (702) and a rotating plate (703); the rotating motor (701) is arranged on one side of the clamping plate (603); the rotating plates (703) are arranged in two groups; the rotating plates (703) are arranged between the two groups of clamping plates (603); the rotating shaft (702) is arranged in two groups; one end of the rotating shaft (702) is fixedly connected to the clamping plate (603); and the other end of the rotating shaft (702) is rotatably connected to the rotating plate (703).

7. The micro mold polishing machine capable of automatic dust collection according to claim 6, characterized in that: The dust suction component (8) comprises a water tank (801), a dust suction pump (802), a connecting pipe (803) and a dust removal cover (804); the water tank (801) is arranged on the top surface of the mounting frame (301); the dust suction pump (802) is arranged on the top surface of the water tank (801); the dust suction pump (802) and the water tank (801) are connected in a through-connection manner; one end of the connecting pipe (803) passes through the top surface of the water tank (801) to the inside of the water tank (801); the other end of the connecting pipe (803) is connected in a through-connection manner to the dust removal cover (804); a connecting rod (805) is arranged on the side wall of the connecting pipe (803); the connecting rod (805) is arranged in a plurality of groups; the plurality of groups of connecting rods (805) are connected via a damping hinge; and an arc-shaped opening is provided on the side wall of the dust removal cover (804).

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