Chemical raw material fine crushing device

Abstract

The utility model relates to the technical field of smashing devices, in particular to a chemical raw material fine smashing device which comprises a smashing assembly, the smashing assembly comprises a smashing box, a feeding pipe with a turning cover is arranged at the top of the smashing box, two smashing rollers are arranged in the smashing box, a discharging hopper is arranged at the bottom of the smashing box, and the bottom end of the discharging hopper is connected with a screening assembly. The screening assembly comprises a screening box, a discharging port is formed in the left side of the screening box, a screening plate is arranged in the screening box, a supporting vertical plate is arranged on the left side of the bottom of the screening box, and a dust collection assembly is arranged at the bottom of the left side of the supporting vertical plate. According to the fine crushing device for the chemical raw materials, the exhaust fan exhausts air in the dust collection box, so that negative pressure is generated in the dust collection box, suction force is generated in the dust collection cover, and when dust is scattered out from the discharge port, the dust enters the dust collection cover and is sucked into the air guide pipe, so that the dust is prevented from being directly diffused into the air, and the service life of the dust collection cover is prolonged. Therefore, workers are prevented from inhaling chemical raw material dust.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverizing devices, in particular to a chemical raw material fine pulverizing device. Background Art

[0002] Chemical raw materials refer to substances used in chemical reactions or chemical synthesis, including inorganic chemical raw materials and organic chemical raw materials. The particle size, shape, purity and other properties of chemical raw materials will affect the rate, efficiency, selectivity and quality of chemical reactions. Therefore, pulverizing chemical raw materials can increase the surface area of ​​chemical raw materials, increase contact with reaction media, promote chemical reactions, and also improve the uniformity, fluidity, solubility and other properties of chemical raw materials, making it easier to store, transport and use chemical raw materials.

[0003] The patent with the publication number CN215029797U discloses a material crusher for chemical experiments, including a shell, a supporting leg is provided at the bottom of the shell, a drying chamber, a crushing channel, and a grinding chamber are provided in the shell from top to bottom, a feed port, a protective cover, and a hot air blower are connected to the top of the shell, a motor 1 is provided in the protective cover, the power output end of the motor 1 passes through the shell and is located in the drying chamber and is connected to a stirring shaft, an air pipe is connected to the output end of the hot air blower, a plurality of air outlets are provided near the stirring shaft at the top of the drying chamber, the air pipe is connected to the air outlet, a discharge valve 1 connected to the drying chamber is provided at the top of the crushing channel, a crushing wheel is rotatably connected in the crushing channel, two crushing wheels are symmetrically provided, and motor 2 is provided near the crushing wheel on both sides of the shell. Compared with the prior art, the advantages of the utility model are: providing a material crusher for chemical experiments that can crush finely, can screen and classify raw materials during crushing, and has the function of drying wet raw materials.

[0004] The above-mentioned prior art performs preliminary crushing of the raw materials through two crushing wheels, and then further grinds the crushed raw materials through a grinding wheel to obtain fine chemical raw materials. However, the two crushing wheels will generate a large amount of dust when crushing the raw materials. The dust is a chemical substance and can be discharged from the discharge port. If it is inhaled by the staff, it will affect the health of the staff. In view of this, we propose a chemical raw material fine crushing device. Utility Model Content

[0005] The purpose of the utility model is to provide a chemical raw material fine grinding device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A chemical raw material fine grinding device comprises a grinding component, the grinding component comprises a grinding box, the top of the grinding box is provided with a feeding pipe with a flip cover, which is used to put the chemical raw material to be ground into the grinding box, the grinding box is provided with two grinding rollers, the bottom of the grinding box is provided with a discharge hopper, the bottom end of the discharge hopper is connected with a screening component, the screening component comprises a screening box connected with the discharge hopper, the discharge hopper guides the chemical raw material after the grinding process from the grinding box into the screening box, the left side of the screening box is provided with a discharge port, the screening box is provided with a sieve plate, the output end of the sieve plate passes through the discharge port to the outside, and the chemical raw material with a larger volume after the grinding is guided out, so that the staff can put this part of the screened chemical raw material into the grinding box again, the bottom of the screening box and near the right side is provided with a first discharge pipe, the bottom end of the first discharge pipe is connected with a grinding component;

[0008] The grinding assembly includes a grinding box connected to a first discharge pipe, through which the screened chemical raw materials are introduced into the grinding box, a grinding disc is provided in the grinding box, and the chemical raw materials entering the grinding box are ground to obtain fine chemical raw materials, and a second discharge pipe is provided at the bottom end of the grinding box for leading out the ground chemical raw materials;

[0009] A supporting upright plate is provided on the left side of the bottom of the screening box to support the screening box, a dust suction assembly is provided on the bottom of the left side of the supporting upright plate, the dust suction assembly includes a dust suction box fixedly connected to the left side of the supporting upright plate, an air guide pipe is provided on the top of the dust suction box, a dust suction hood is provided at one end of the air guide pipe away from the dust suction box, the two ends of the air guide pipe are respectively connected with the dust suction box and the dust suction hood, the dust suction hood is fixedly connected to the left side of the screening box, and the dust suction hood is connected with the discharge port, the sieve plate passes through the dust suction hood, and when dust is scattered from the discharge port, suction is generated in the dust suction hood , the dust can be sucked into the air duct, thereby preventing the dust from directly diffusing into the air, and further preventing the staff from inhaling the dust of chemical raw materials. An exhaust pipe is provided at the bottom of the rear side of the dust collection box, and an exhaust fan is provided in the exhaust pipe. A filter box is provided in the dust collection box, and a filter net is provided at the bottom of the filter box. The exhaust fan discharges the air in the dust collection box, thereby generating a negative pressure in the dust collection box, and further generating suction in the dust collection hood. The dust enters the dust collection box from the air duct along with the airflow, and then the dust in the gas can be filtered by the filter box, thereby preventing the dust from being discharged from the exhaust pipe.

[0010] Preferably, the left ends of the two crushing roller shafts pass through the left side of the inner wall of the crushing box, and the left ends of the two crushing roller shafts are coaxially connected with gears. The two gears are meshed and driven to make the two crushing rollers rotate relative to each other, thereby crushing the chemical raw materials.

[0011] Preferably, a first motor is provided on the right side of the crushing box, and the output shaft of the first motor is coaxially connected to the right end of one of the crushing roller shafts. One of the crushing rollers is driven to rotate by the first motor, and under the action of two gears, the two crushing rollers can rotate.

[0012] Preferably, a first special-shaped material guide hopper is provided at the top of the inner wall of the screening box, and the output end of the first special-shaped material guide hopper is close to the right side of the top of the sieve plate, and the crushed chemical raw materials are output onto the sieve plate, and the sieve plate can fully screen the chemical raw materials to avoid the chemical raw materials falling on the sieve plate and being directly output to the left. A second special-shaped material guide hopper is provided at the bottom of the inner wall of the screening box, and the output end of the second special-shaped material guide hopper is connected to the first discharge pipe, and the chemical raw materials falling from the sieve holes of the sieve plate are introduced into the first discharge pipe.

[0013] Preferably, strip fixing plates are provided at the middle and lower parts of the front and rear sides of the inner wall of the screening box, first springs are provided at the tops of the two strip fixing plates and near the right end, second springs are provided at the tops of the two strip fixing plates and near the left end, the tops of the two first springs and the two second springs are fixedly connected to the bottom of the sieve plate, the length of the first spring is greater than the length of the second spring, so that the sieve plate is set at an angle, and when the chemical raw material falls onto the sieve plate, the sieve plate will vibrate, thereby causing the sieve plate to screen the chemical raw material.

[0014] Preferably, a plurality of connecting rods are provided on the top of the grinding box, and the top ends of the connecting rods are fixedly connected to the bottom of the screening box to fix the position of the grinding box. Support legs are provided at the front and rear ends of the right side of the bottom of the screening box, and the two supporting legs cooperate with the supporting vertical plate to support the screening box.

[0015] Preferably, a second motor is provided in the middle of the top of the grinding box, the output shaft of the second motor passes through the top of the grinding box and is coaxially connected to the top end of the grinding disc shaft, and the grinding disc is driven to rotate by the second motor.

[0016] Preferably, U-shaped positioning plates are provided on the front and rear sides of the inner wall of the dust box, and the filter box is slidably connected between the two U-shaped positioning plates to position the filter box. The left side of the filter box passes through the inner wall of the dust box, and a frame-shaped sealing rubber pad is provided at the connection between the filter box and the dust box, so that the filter box can be taken out for cleaning, and outside air can be prevented from entering the dust box from the connection between the filter box and the dust box when in use.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. In the chemical raw material fine grinding device, the exhaust fan discharges the air in the dust box, thereby generating negative pressure in the dust box, and then generating suction in the dust hood. When dust is scattered from the discharge port, the dust enters the dust hood and is sucked into the air duct, thereby preventing the dust from directly diffusing into the air, thereby preventing the staff from inhaling the chemical raw material dust. The dust enters the dust box from the air duct along with the air flow, and then the dust in the gas can be filtered by the filter box, thereby preventing the dust from being discharged from the exhaust pipe.

[0019] 2. The chemical raw material fine grinding device drives one of the grinding rollers to rotate through the first motor. Under the action of two gears, the two grinding rollers can be rotated to grind the chemical raw materials. The discharge hopper guides the chemical raw materials after grinding from the grinding box into the screening box. The screen plate screens the crushed chemical raw materials and guides the chemical raw materials that are still large in volume after grinding. The chemical raw materials that meet the requirements are guided into the grinding box from the first discharge pipe. The grinding disc grinds the chemical raw materials entering the grinding box to obtain fine chemical raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall first-view structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the overall structure of the utility model from a second viewing angle;

[0022] Figure 3 This is a schematic diagram of the structure of the crushing component in the utility model;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of the screening component and the grinding component in the utility model;

[0024] Figure 5 It is a schematic diagram of the structure of the dust collection component in the utility model.

[0025] In the figure: 1. crushing assembly; 10. crushing box; 11. feeding pipe; 12. flip cover; 13. crushing roller; 14. gear; 15. first motor; 16. discharge hopper; 2. screening assembly; 20. screening box; 200. discharge port; 21. first special-shaped guide hopper; 22. sieve plate; 23. strip fixing plate; 24. first spring; 25. second spring; 26. second special-shaped guide hopper; 27. first discharge pipe; 3. grinding assembly; 30. grinding box; 31. second motor; 32. grinding disc; 33. second discharge pipe; 34. connecting rod; 4. dust collection assembly; 40. dust collection hood; 41. dust collection box; 42. air guide pipe; 43. exhaust pipe; 44. exhaust fan; 45. filter box; 46. U-shaped positioning plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0029] A chemical raw material fine grinding device comprises a grinding component 1, the grinding component 1 comprises a grinding box 10, the top of the grinding box 10 is provided with a feeding pipe 11 with a flip cover 12, which is used to put the chemical raw material to be ground into the grinding box 10, the grinding box 10 is provided with two grinding rollers 13, the bottom of the grinding box 10 is provided with a discharge hopper 16, the bottom end of the discharge hopper 16 is connected to a screening component 2, the screening component 2 comprises a screening box 20 connected to the discharge hopper 16, and the discharge hopper 16 feeds the chemical raw material after the grinding process into the grinding box 10. The chemical raw materials are introduced from the crushing box 10 into the screening box 20. A discharge port 200 is provided on the left side of the screening box 20. A sieve plate 22 is provided in the screening box 20. The output end of the sieve plate 22 passes through the discharge port 200 to the outside, and the chemical raw materials with a larger volume after crushing are discharged, so that the staff can put this part of the screened chemical raw materials into the crushing box 10 again. A first discharge pipe 27 is provided at the bottom of the screening box 20 and close to the right side. The bottom end of the first discharge pipe 27 is connected to the grinding assembly 3.

[0030] The grinding assembly 3 includes a grinding box 30 connected to the first discharge pipe 27. The screened chemical raw materials are introduced into the grinding box 30 through the first discharge pipe 27. The grinding box 30 is provided with a grinding disc 32 to grind the chemical raw materials entering the grinding box 30 to obtain fine chemical raw materials. The bottom end of the grinding box 30 is provided with a second discharge pipe 33 for leading out the ground chemical raw materials.

[0031] A support vertical plate is provided on the left side of the bottom of the screening box 20 to support the screening box 20. A dust collection assembly 4 is provided on the bottom of the left side of the support vertical plate. The dust collection assembly 4 includes a dust collection box 41 fixedly connected to the left side of the support vertical plate. An air guide 42 is provided on the top of the dust collection box 41. A dust collection hood 40 is provided at one end of the air guide 42 away from the dust collection box 41. The two ends of the air guide 42 are respectively connected to the dust collection box 41 and the dust collection hood 40. The dust collection hood 40 is fixedly connected to the left side of the screening box 20, and the dust collection hood 40 is connected to the discharge port 200. The sieve plate 22 passes through the dust collection hood 40. When dust is dispersed from the discharge port 200, dust is generated in the dust collection hood 40. Suction can suck the dust into the air duct 42, thereby preventing the dust from directly diffusing into the air, and further preventing the staff from inhaling the dust of chemical raw materials. An exhaust pipe 43 is provided at the bottom of the rear side of the dust box 41, and an exhaust fan 44 is provided in the exhaust pipe 43. A filter box 45 is provided in the dust box 41, and a filter net is provided at the bottom of the filter box 45. The exhaust fan 44 discharges the air in the dust box 41, thereby generating a negative pressure in the dust box 41, and then generating suction in the dust hood 40. The dust enters the dust box 41 from the air duct 42 along with the airflow, and then the dust in the gas can be filtered by the filter box 45, thereby preventing the dust from being discharged from the exhaust pipe 43.

[0032] In this embodiment, the left ends of the rotating shafts of the two crushing rollers 13 pass through the left side of the inner wall of the crushing box 10, and the left ends of the rotating shafts of the two crushing rollers 13 are coaxially connected with gears 14. The two gears 14 are meshed and transmitted to make the two crushing rollers 13 rotate relative to each other, thereby crushing the chemical raw materials.

[0033] Specifically, a first motor 15 is provided on the right side of the crushing box 10, and the output shaft of the first motor 15 is coaxially connected to the right end of the rotating shaft of one of the crushing rollers 13. The first motor 15 drives one of the crushing rollers 13 to rotate, and under the action of the two gears 14, the two crushing rollers 13 can rotate.

[0034] Furthermore, a first special-shaped material guide hopper 21 is provided at the top of the inner wall of the screening box 20, and the output end of the first special-shaped material guide hopper 21 is close to the right side of the top of the sieve plate 22, so as to output the crushed chemical raw materials to the sieve plate 22, and enable the sieve plate 22 to fully screen the chemical raw materials, thereby preventing the chemical raw materials from falling on the sieve plate 22 and being directly output to the left. A second special-shaped material guide hopper 26 is provided at the bottom of the inner wall of the screening box 20, and the output end of the second special-shaped material guide hopper 26 is connected to the first discharge pipe 27, so as to introduce the chemical raw materials falling from the sieve holes of the sieve plate 22 into the first discharge pipe 27.

[0035] Furthermore, strip fixing plates 23 are provided at the middle and lower parts of the front and rear sides of the inner wall of the screening box 20, first springs 24 are provided at the tops of the two strip fixing plates 23 and near the right ends, second springs 25 are provided at the tops of the two strip fixing plates 23 and near the left ends, the tops of the two first springs 24 and the two second springs 25 are fixedly connected to the bottom of the sieve plate 22, the length of the first spring 24 is greater than the length of the second spring 25, so that the sieve plate 22 is inclined, and when the chemical raw materials fall onto the sieve plate 22, the sieve plate 22 will vibrate, so that the sieve plate 22 screens the chemical raw materials.

[0036] Furthermore, a plurality of connecting rods 34 are provided on the top of the grinding box 30, and the top ends of the connecting rods 34 are fixedly connected to the bottom of the screening box 20 to fix the position of the grinding box 30. Support legs are provided at the front and rear ends of the right side of the bottom of the screening box 20, and the two supporting legs cooperate with the supporting vertical plate to support the screening box 20.

[0037] Furthermore, a second motor 31 is provided in the middle of the top of the grinding box 30. The first motor 15, the second motor 31 and the exhaust fan 44 all work with an external power supply. The output shaft of the second motor 31 passes through the top of the grinding box 30 and is coaxially connected to the top of the rotating shaft of the grinding disc 32. The grinding disc 32 is driven to rotate by the second motor 31.

[0038] Furthermore, U-shaped positioning plates 46 are provided on the front and rear sides of the inner wall of the dust box 41, and the filter box 45 is slidably connected between the two U-shaped positioning plates 46 to position the filter box 45. The left side of the filter box 45 passes through the inner wall of the dust box 41, and a frame-shaped sealing rubber pad is provided at the connection between the filter box 45 and the dust box 41, so that the filter box 45 can be taken out and cleaned, and outside air can be prevented from entering the dust box 41 from the connection between the filter box 45 and the dust box 41 when in use.

[0039] When the chemical raw material fine grinding device of this embodiment is in use, the staff first starts the first motor 15, the second motor 31 and the exhaust fan 44 to work, the first motor 15 drives one of the grinding rollers 13 to rotate, under the action of the two gears 14, the two grinding rollers 13 can be rotated, the second motor 31 drives the grinding disc 32 to rotate, and the exhaust fan 44 discharges the air in the dust box 41, so that negative pressure is generated in the dust box 41, and then suction is generated in the dust cover 40, and then the staff puts the chemical raw material to be crushed into the crushing box 10 from the feeding pipe 11, and the two grinding rollers 13 grind the chemical raw material, and the chemical raw material after the grinding process enters the screening box 20 from the discharge hopper 16, and under the action of the first special-shaped guide hopper 21, the crushed chemical raw material is output to the sieve plate 22, and the sieve plate 22 will vibrate when the chemical raw material falls on the sieve plate 22. The sieve plate 22 is used to screen the chemical raw materials, and the sieve plate 22 guides out the chemical raw materials that are still large in volume after being crushed. When dust is emitted from the discharge port 200, the dust enters the dust hood 40, and the dust is sucked into the air duct 42, thereby preventing the dust from directly diffusing into the air. The dust enters the dust box 41 from the air duct 42 along with the air flow, and then the dust in the gas can be filtered by the filter box 45, thereby preventing the dust from being discharged from the exhaust pipe 43. The chemical raw materials falling downward from the sieve holes of the sieve plate 22 will enter the second special-shaped guide hopper 26, and the second special-shaped guide hopper 26 will guide the chemical raw materials that meet the requirements into the first discharge pipe 27, and the first discharge pipe 27 will guide the chemical raw materials into the grinding box 30. The grinding disc 32 grinds the chemical raw materials entering the grinding box 30 to obtain fine chemical raw materials, and the fine chemical raw materials produced after processing are guided out from the second discharge pipe 33.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A chemical raw material fine pulverizing device, comprising a pulverizing component (1), characterized in that: The pulverizing assembly (1) comprises a pulverizing box (10), the top of the pulverizing box (10) is provided with a feed pipe (11) with a flip cover (12), the pulverizing box (10) is provided with two pulverizing rollers (13), the bottom of the pulverizing box (10) is provided with a discharge hopper (16), the bottom end of the discharge hopper (16) is connected to a screening assembly (2), the screening assembly (2) comprises a screening box (20) connected to the discharge hopper (16), a discharge port (200) is provided on the left side of the screening box (20), a sieve plate (22) is provided in the screening box (20), the output end of the sieve plate (22) passes through the discharge port (200) to the outside, a first discharge pipe (27) is provided at the bottom of the screening box (20) and close to the right side, the bottom end of the first discharge pipe (27) is connected to a grinding assembly (3), the grinding assembly (3) comprises a discharge port (200) connected to the first discharge pipe (200), and a discharge port (200) is provided on the left side of the screening box (20). 7) a grinding box (30) connected to the screening box (20), wherein a grinding disc (32) is provided in the grinding box (30), a second discharge pipe (33) is provided at the bottom end of the grinding box (30), a support vertical plate is provided on the left side of the bottom of the screening box (20), a dust collection assembly (4) is provided at the bottom of the left side of the support vertical plate, the dust collection assembly (4) comprises a dust collection box (41) fixedly connected to the left side of the support vertical plate, an air guide pipe (42) is provided at the top of the dust collection box (41), a dust collection hood (40) is provided at one end of the air guide pipe (42) away from the dust collection box (41), the dust collection hood (40) is fixedly connected to the left side of the screening box (20), and the dust collection hood (40) is connected to the discharge port (200), an exhaust pipe (43) is provided at the bottom of the rear side of the dust collection box (41), an exhaust fan (44) is provided in the exhaust pipe (43), and a filter box (45) is provided in the dust collection box (41).

2. The chemical raw material fine grinding device according to claim 1 is characterized in that: The left ends of the rotating shafts of the two crushing rollers (13) pass through the left side of the inner wall of the crushing box (10), and the left ends of the rotating shafts of the two crushing rollers (13) are coaxially connected to a gear (14), and the two gears (14) are meshed for transmission.

3. The chemical raw material fine pulverizing device according to claim 1, characterized in that: A first motor (15) is provided on the right side of the crushing box (10), and an output shaft of the first motor (15) is coaxially connected to the right end of a rotating shaft of one of the crushing rollers (13).

4. The chemical raw material fine pulverizing device according to claim 1, characterized in that: A first special-shaped material guide hopper (21) is provided at the top of the inner wall of the screening box (20), and an output end of the first special-shaped material guide hopper (21) is close to the right side of the top of the screen plate (22). A second special-shaped material guide hopper (26) is provided at the bottom of the inner wall of the screening box (20), and an output end of the second special-shaped material guide hopper (26) is connected to the first discharge pipe (27).

5. The chemical raw material fine pulverizing device according to claim 1, characterized in that: A strip fixing plate (23) is provided at the middle and lower parts of the front and rear sides of the inner wall of the screening box (20), a first spring (24) is provided at the top of the two strip fixing plates (23) and near the right end, a second spring (25) is provided at the top of the two strip fixing plates (23) and near the left end, and the top ends of the two first springs (24) and the two second springs (25) are fixedly connected to the bottom of the screening plate (22).

6. The chemical raw material fine pulverizing device according to claim 1, characterized in that: A plurality of connecting rods (34) are provided on the top of the grinding box (30), the top ends of the connecting rods (34) are fixedly connected to the bottom of the screening box (20), and the front and rear ends of the right side of the bottom of the screening box (20) are both provided with supporting legs.

7. The chemical raw material fine pulverizing device according to claim 1, characterized in that: A second motor (31) is provided in the middle of the top of the grinding box (30), and an output shaft of the second motor (31) passes through the top of the grinding box (30) and is coaxially connected to the top end of the rotating shaft of the grinding disc (32).

8. The chemical raw material fine pulverizing device according to claim 1, characterized in that: U-shaped positioning plates (46) are provided on both the front and rear sides of the inner wall of the dust collection box (41); the filter box (45) is slidably connected between the two U-shaped positioning plates (46); the left side of the filter box (45) passes through the inner wall of the dust collection box (41); and a frame-shaped sealing rubber pad is provided at the connection between the filter box (45) and the dust collection box (41).

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