CN113879801A

CN113879801A - Cleaning system is scraped with compound shovel to band conveyer clear away belt sizing

Info

Publication number: CN113879801A
Application number: CN202111264467.3A
Authority: CN
Inventors: 郑木生; 魏志军
Original assignee: Maanshan Fangzheng Machinery Manufacturing Co ltd
Current assignee: Maanshan Fangzheng Machinery Manufacturing Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-01-04
Anticipated expiration: 2041-10-28
Also published as: CN113879801B

Abstract

The invention relates to the technical field of belt conveying, and discloses a composite scraping and cleaning system for a belt conveyor to remove belt sticky materials. According to the belt surface material cleaning device, due to the fact that the hob and the asymmetric baffle are arranged, when the hob contacts a belt, the hob can be blocked by the belt and further shrinks inwards, the hob is formed by combining the hob in a segmented mode, each segment of the hob is always in contact with the surface of the belt, the phenomenon that the hob is missed to scrape the belt is avoided, the cleaning effect of the surface material of the belt is affected, meanwhile, when the hob shrinks inwards, gas in the outer sliding cavity can be squeezed into the inner sliding cavity through the communicating holes, in the process, the gas is blocked by the asymmetric baffle and further receives uneven pressure, the hob vibrates in the process of contacting the surface of the belt, the vibration shearing force is applied to the surface material of the belt, the material is easier to be shoveled by the hob, and the cleaning effect of the surface material of the belt is further improved.

Description

Cleaning system is scraped with compound shovel to band conveyer clear away belt sizing

Technical Field

The invention relates to the technical field of belt conveying, in particular to a composite scraping and cleaning system for a belt conveyor to remove belt sticky materials.

Background

Utilize band conveyer to transport the material in trades such as material processing usually, but because some materials have viscidity for band conveyer is when unloading, and partly material can the adhesion on the belt, and then causes to produce the strip material friction between cylinder and the belt, the life of very big reduction belt, so, just at this moment need use the sweeper to clear up the adhesion material.

The existing belt sweeper is in the working process, the belt sweeper is in contact with a belt through a scraping plate arranged at the discharging part of a belt conveyor, the belt is made to continue to be in contact with the scraping plate after discharging is completed, the sticky materials on the surface of the belt are scraped by the scraping plate, and then the function of cleaning the sticky materials is achieved.

Disclosure of Invention

Aiming at the defects of the prior belt cleaner in the prior art in the using process, the invention provides a composite scraping and cleaning system for removing belt sticky materials of a belt conveyor, which has the advantages of improving the cleaning effect of the sticky materials on the surface of the belt and prolonging the service life of the belt, and solves the technical problems in the prior art.

The invention provides the following technical scheme: the utility model provides a belt conveyor clears away belt sizing and scrapes cleaning system with compound shovel, includes the belt feeder, the left side of belt feeder is provided with the one-level sweeper, the one-level sweeper sets up for sectional type scraper structure, the left position in belt feeder below is provided with the second grade sweeper, the second grade sweeper sets up for the spiral hobbing cutter structure of symmetry, the position at belt feeder below middle part is provided with tertiary sweeper, tertiary sweeper sets up for thick round brush structure, the position on belt feeder below right side is provided with the level four sweeper, the level four sweeper sets up for thin round brush structure.

Preferably, the secondary sweeper comprises a main body, a through hole, a shunting seat, a small air cavity, an atmospheric air cavity, an air suction port, a dust suction seat, a filter screen, a dust suction port and a hob assembly, the main body is arranged at the left position below the belt conveyor, the through hole is formed in the main body and penetrates through the main body, hobs are arranged on the side face of the main body at equal intervals, the hobs are arranged in a symmetrical spiral sectional structure, telescopic films are fixedly arranged on the two sides of the bottom face of each hob, the other end of each telescopic film is fixedly connected with the side face of the main body, a slide bar is fixedly arranged in the middle of the bottom face of each hob, an outer sliding cavity is formed in the outer side position of the main body and is in sliding connection with the outer sliding cavity, gas is filled in the inner side position of the slide bar in the outer sliding cavity, and a communication hole is formed in the position of the inner side of the outer sliding cavity in the main body, an inner sliding cavity is formed in the position, located on the inner side of the communicating hole, in the main body and communicated with the outer sliding cavity through the communicating hole, a piston is slidably mounted in the inner sliding cavity, the inner side face of the piston is fixedly connected with one end of an elastic piece, and the other end of the elastic piece is fixedly connected with the bottom face of the inner sliding cavity.

Preferably, an asymmetric baffle is fixedly installed on the inner wall of the communication hole.

Preferably, a shunt seat is movably mounted inside the through hole, the shunt seat moves relative to the main body, the middle part of the shunt seat is in a semi-cylindrical structure, a small air cavity is formed in the middle of the shunt seat, and the small air cavity penetrates through the shunt seat.

Preferably, the two end parts of the flow dividing seat are circular baffle plate structures, the position, located on the circular baffle plate, of one side of the flow dividing seat is a closed cylindrical structure, an air hole is formed in the position, located on the bottom surface of the inner sliding cavity, in the main body, and the air hole is communicated with the inner sliding cavity and the through hole.

Preferably, the shunting seat and the main body enclose an atmosphere cavity, an air suction port is formed in a rotating shaft of the main body and communicated with the through hole and the atmosphere cavity, a dust collection seat is movably sleeved on the rotating shaft of the main body and moves relative to the main body, an inner cavity of the dust collection seat is communicated with the air suction port, a filter screen is fixedly installed in the inner cavity of the dust collection seat, a dust collection port is fixedly installed on the upper surface of the dust collection seat, and the dust collection port is communicated with the inner cavity of the dust collection seat.

The invention has the following beneficial effects:

1. according to the belt surface material cleaning device, due to the fact that the hob and the asymmetric baffle are arranged, when the hob contacts a belt, the hob can be blocked by the belt and further shrinks inwards, the hob is formed by combining the hob in a segmented mode, each segment of the hob is always in contact with the surface of the belt, the phenomenon that the hob is missed to scrape the belt is avoided, the cleaning effect of the surface material of the belt is affected, meanwhile, when the hob shrinks inwards, gas in the outer sliding cavity can be squeezed into the inner sliding cavity through the communicating holes, in the process, the gas is blocked by the asymmetric baffle and further receives uneven pressure, the hob vibrates in the process of contacting the surface of the belt, the vibration shearing force is applied to the surface material of the belt, the material is easier to be shoveled by the hob, and the cleaning effect of the surface material of the belt is further improved.

2. The invention keeps the shrinkage state and continues rotating after the current hob finishes the shoveling operation through the arrangement of the hob, the asymmetric baffle and the shunting seat, when the hob rotates to the position that the air hole matched with the hob is communicated with the atmospheric cavity, the piston is driven by the elastic piece to move outwards, so that the position inside the piston in the inner sliding cavity generates negative pressure, the negative pressure generates suction force on the dust suction port through the atmospheric cavity, and further dust generated when the hob shovels the materials is sucked into the dust suction port and falls on the filter screen, thereby avoiding the dust from floating around and polluting the working environment, meanwhile, the gas entering the dust suction port together with the dust passes through the filter screen and finally enters the inner sliding cavity, the gas entering the inner sliding cavity pushes the piston to move outwards together with the elastic piece, and further the gas originally conveyed from the outer sliding cavity is pushed back to the outer sliding cavity, and in the process, the gas passes through the asymmetric baffle again, and then make the hobbing cutter move the in-process outward and produce the vibration for in the collecting device of below is fallen to the sizing between the adjacent hobbing cutter, avoid the sizing to block up in the gap between the adjacent hobbing cutter, influence follow-up sizing clearance operation, reduce the clearance effect.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of a two-stage sweeper of the present invention;

FIG. 3 is a schematic view of a dust-collecting base according to the present invention;

FIG. 4 is a schematic side view of a structural diverter base according to the present invention;

FIG. 5 is a schematic view of the internal structure of the hob assembly of the present invention;

FIG. 6 is an enlarged view of a portion of the structure shown in FIG. 5;

FIG. 7 is a schematic cross-sectional view of a three-stage sweeper of the present invention.

In the figure: 1. a belt conveyor; 2. a primary sweeper; 3. a secondary sweeper; 30. a main body; 31. a through hole; 32. a shunt seat; 33. a small air cavity; 34. an atmospheric cavity; 35. an air suction port; 36. a dust collection base; 37. filtering with a screen; 38. a dust suction port; 39. a hob assembly; 390. hobbing cutters; 391. a stretch film; 392. a slide bar; 393. an outer slide cavity; 394. a communicating hole; 395. an asymmetric baffle; 396. an inner slide cavity; 397. a piston; 398. an elastic member; 399. air holes; 4. a three-stage sweeper; 5. a four-stage sweeper.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a composite scraping and cleaning system for a belt conveyor to remove belt sticky materials comprises a belt conveyor 1, a first-stage cleaner 2 is arranged on the left side of the belt conveyor 1, the first-stage cleaner 2 is of a sectional scraper structure, a second-stage cleaner 3 is arranged on the left side below the belt conveyor 1, the second-stage cleaner 3 is of a symmetrical spiral hob structure, a third-stage cleaner 4 is arranged on the middle below the belt conveyor 1, the third-stage cleaner 4 is of a thick rolling brush structure, a fourth-stage cleaner 5 is arranged on the right side below the belt conveyor 1, the fourth-stage cleaner 5 is of a thin rolling brush structure, when the belt conveyor 1 carries sticky materials to run to the position of the first-stage cleaner 2, most of the sticky materials are scraped by the sectional scraper, and then the belt conveyor 1 continues to move, so that the sticky materials on the belt are scraped by the hob structure of the second-stage cleaner 3, and swept by the fourth-stage cleaner 4 and the fourth-stage cleaner 5, thereby finishing the cleaning operation of the adhesive material on the belt.

Referring to fig. 2, 3 and 5, the secondary sweeper 3 comprises a main body 30, a through hole 31, a flow dividing seat 32, a small air cavity 33, an atmospheric air cavity 34, an air suction port 35, a dust suction seat 36, a filter screen 37, a dust suction port 38 and a hob assembly 39, wherein the main body 30 is arranged at the left side below the belt conveyor 1, the through hole 31 is arranged in the main body 30, the through hole 31 penetrates through the main body 30, the hob assembly 39 is arranged on the side surface of the main body 30 at equal intervals, the hob assembly 39 is arranged in a symmetrical spiral sectional structure, the hob assembly 39 comprises a hob 390, a telescopic film 391, a slide rod 392, an outer slide cavity 393, a communication hole 394, an asymmetric baffle 395, an inner slide cavity 396, a piston 397, an elastic member and an air hole 399, the hob 390 is arranged on the side surface of the main body 30 at equal intervals, the telescopic film 391 is fixedly arranged on both sides of the bottom surface of the hob 390, the other end of the telescopic film 391 is fixedly connected with the side surface of the main body 30, the slide rod 392 is fixedly arranged at the middle position of the bottom surface of the hob 390, an outer sliding cavity 393 is arranged at the outer side position inside the main body 30, the sliding rod 392 is connected with the outer sliding cavity 393 in a sliding manner, gas is filled in the outer sliding cavity 393 at the inner side position of the sliding rod 392, a communication hole 394 is arranged at the inner side position of the outer sliding cavity 393 in the main body 30, an inner sliding cavity 396 is arranged at the inner side position of the communication hole 394 in the main body 30, the inner sliding cavity 396 is communicated with the outer sliding cavity 393 through the communication hole 394, a piston 397 is installed in the inner sliding cavity 396 in a sliding manner, the inner side surface of the piston 397 is fixedly connected with one end of an elastic member 398, the other end of the elastic member 398 is fixedly connected with the bottom surface of the inner sliding cavity 396, when the main body 30 drives the hob 390 to contact the belt, the hob 390 is blocked by the belt, the sliding rod 392 is driven to contract inwards, and because the hob assembly 39 is of a sectional type structure, and when the sliding rod 392 contracts inwards, the gas in the outer sliding cavity 393 is pushed into the inner sliding cavity 396 through the communication hole 394, in the process, the gas is applied to the piston 397 by the elastic piece 398, so that the hob 390 is always in contact with the surface of the belt, and the phenomenon that the hob 390 is missed to scrape to influence the cleaning effect of the sticky materials on the surface of the belt is avoided.

Please refer to fig. 6, an asymmetric baffle 395 is fixedly installed on an inner wall of the communication hole 394, when the gas in the outer sliding chamber 393 and the inner sliding chamber 396 passes through the communication hole 394, the gas is blocked by the asymmetric baffle 395, and further, when the gas passes through the communication hole 394, the pressure applied to the gas is not uniform, and further, the hob 390 is driven to vibrate, when the hob 390 contacts the belt, the vibration causes the hob 390 to apply a vibrating shearing force to the sticky material, so that the sticky material is more easily shoveled by the hob 390, thereby further improving the cleaning effect of the sticky material on the surface of the belt, when the hob 390 carries the scraped sticky material to rotate, the carried sticky material falls off due to the vibration, and further, the sticky material is prevented from being blocked in a gap between adjacent hobs 390, the subsequent sticky material cleaning operation is influenced, and the cleaning effect is reduced.

Referring to fig. 3, a shunt seat 32 is movably installed inside the through hole 31, the shunt seat 32 and the main body 30 move relative to each other, a semi-cylindrical structure is disposed at a middle portion of the shunt seat 32, a small air chamber 33 is disposed at the middle position, the small air chamber 33 penetrates through the shunt seat 32, when the roller cutter 390 contracts inward, air in the outer sliding chamber 393 is pushed into the inner sliding chamber 396 through the sliding rod 392, the piston 397 compresses the elastic member 398, the inner sliding chamber 396 is located inside the piston 397 to discharge air, then the roller cutter 390 loses resistance applied by the belt along with rotation of the main body 30, at this time, the shunt seat 32 seals the air hole 399, negative pressure is generated at a position inside the piston 397 in the inner sliding chamber 396, the piston 397 is located at a current position, and further, when the piston 397 resets, the roller cutter 390 is pushed by air to reset, which affects subsequent discharging operation.

Referring to fig. 4, two ends of the flow dividing base 32 are arranged in a circular baffle structure, a position of one side of the flow dividing base 32 on the circular baffle is arranged in a closed cylindrical structure, an air hole 399 is arranged in the main body 30 at a position at the bottom of the inner slide cavity 396, the air hole 399 is communicated with the inner slide cavity 396 and the through hole 31, when air is discharged from a position at the inner side of the piston 397 in the inner slide cavity 396, the air enters the small air cavity 33 and is finally discharged into the external environment, through the closed cylindrical structure, the air in the small air cavity 33 is prevented from entering the dust suction base 36 and is discharged from the dust suction port 38, the generated dust is scattered by the discharged air to pollute the working environment, meanwhile, through the arrangement of the circular baffle structure, the atmospheric cavity 34 is in a closed state, so that when the subsequent atmospheric cavity 34 generates suction force, the suction force can be concentrated at the air suction port 35 to play a role in increasing the suction force, further improving the dust adsorption and collection capacity.

Referring to fig. 3, an atmosphere cavity 34 is enclosed by the diversion seat 32 and the main body 30, an air suction port 35 is opened on a rotating shaft of the main body 30, the air suction port 35 is communicated with the through hole 31 and the atmosphere cavity 34, a dust suction seat 36 is movably sleeved on the rotating shaft of the main body 30, the dust suction seat 36 moves relative to the main body 30, an inner cavity of the dust suction seat 36 is communicated with the air suction port 35, a filter screen 37 is fixedly installed in the inner cavity of the dust suction seat 36, a dust suction port 38 is fixedly installed on the upper surface of the dust suction seat 36, the dust suction port 38 is communicated with the inner cavity of the dust suction seat 36, when the hob 390 rotates to a position where an air hole 399 matched with the hob 390 is communicated with the atmosphere cavity 34, the position inside the piston 397 in the inner sliding cavity 396 passes through negative pressure to generate suction force to the atmosphere cavity 34, the suction force passes through the air suction port 35, the dust suction seat 36 and the dust suction port 38 to generate suction effect to a material shoveling area, so that dust generated when the hob 390 shovels materials is sucked into the dust suction port 38, and fall on the filter screen 37, thereby preventing dust from flying around and polluting the working environment.

The use method (working principle) of the invention is as follows:

when the device works, firstly, the motor drives the second-stage sweeper 3, the third-stage sweeper 4 and the fourth-stage sweeper 5 to rotate in the direction shown in figure 1, then the motor drives the belt conveyor 1 to start conveying materials, the materials are driven by the belt conveyor 1 to move leftwards and are separated at the left end of the belt conveyor 1, and then unloading is completed, in the process, a part of the materials with higher viscosity are adhered to the belt and are contacted with the first-stage sweeper 2 along with the movement of the belt, wherein most of the sticky materials are scraped by the sectional scraper, then, the belt conveyor 1 continues to move, and then the sticky materials on the belt are contacted with the second-stage sweeper 3, in the process, the second-stage sweeper 3 rotates, so that the main body 30 drives the hob 390 to be contacted with the belt, the hob 390 is blocked by the belt, and further drives the slide rod 392 to contract inwards, and when the slide rod 392 contracts inwards, gas in the outer sliding cavity 393 is pushed into the inner sliding cavity 396 through the communication hole 394, the gas entering the inner slide cavity 396 pushes the piston 397 to move inwards and press the elastic member 398, meanwhile, when the gas in the outer slide cavity 393 enters the inner slide cavity 396 through the communication hole 394, the gas is blocked by the asymmetric baffle 395 in the communication hole 394, and uneven pressure is generated, so that the roller cutter 390 is driven to vibrate, the vibration enables the roller cutter 390 to apply vibration shearing force to the viscous material, the viscous material is shoveled by the roller cutter 390 and retained in a gap between the adjacent roller cutters 390, then, along with the continuous rotation of the main body 30, the roller cutter 390 loses the resistance force applied by a belt, at the moment, the diversion seat 32 seals the air hole 399, a negative pressure is generated at a position inside the piston 397 in the inner slide cavity 396, the piston 397 is continuously at the current position, the roller cutter 390 is in a contraction state, and then, when the roller cutter 390 rotates to a position where the air hole 399 matched with the roller cutter is communicated with the atmosphere cavity 34, a position inside the piston 397 in the inner slide cavity 396 passes through the negative pressure, further, a suction force is generated to the atmosphere cavity 34, the suction force passes through the suction port 35, the dust suction seat 36 and the dust suction port 38, and further a suction effect is generated to a material shoveling area, so that dust generated when the hob 390 shovels materials is sucked into the dust suction port 38 and falls on the filter screen 37, meanwhile, air entering the dust suction port 38 together with the dust passes through the filter screen 37, the suction port 35, the atmosphere cavity 34 and the air hole 399 and finally enters the inner sliding cavity 396, the air entering the inner sliding cavity 396 pushes the piston 397 to move outwards together with the elastic member 398, further the air originally conveyed from the outer sliding cavity 393 is pushed back to the outer sliding cavity 393, the air entering the outer sliding cavity 393 pushes the sliding rod 392 to move outwards, further the hob 390 moves outwards, in the process, the air passes through the asymmetric baffle 395 again, further the hob 390 vibrates in the moving outwards, and the sticky materials between adjacent hobs 390 are vibrated to be collected in the lower part by the hob, and then, the belt conveyor 1 continues to rotate, so that the sticky materials on the belt pass through the brushes of the three-stage sweeper 4 and the four-stage sweeper 5, and the cleaning operation of the sticky materials on the belt is completed, which is a working cycle.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a belt conveyor clears away belt sizing and scrapes cleaning system with compound shovel, includes belt feeder (1), its characterized in that: the left side of belt feeder (1) is provided with one-level sweeper (2), one-level sweeper (2) sets up for sectional type scraper structure, the left position in belt feeder (1) below is provided with second grade sweeper (3), second grade sweeper (3) set up for the spiral hobbing cutter structure of symmetry, the position at belt feeder (1) below middle part is provided with tertiary sweeper (4), tertiary sweeper (4) sets up for thick round brush structure, the position on belt feeder (1) below right side is provided with level four sweeper (5), level four sweeper (5) set up for thin round brush structure.

2. The compound scraping and cleaning system for removing the belt sticky materials of the belt conveyor according to claim 1, is characterized in that: the secondary sweeper (3) consists of a main body (30), a through hole (31), a flow dividing seat (32), a small air cavity (33), an atmosphere cavity (34), an air suction port (35), a dust suction seat (36), a filter screen (37), a dust suction port (38) and a hob cutter (390) assembly (39), wherein the main body (30) is arranged at the left side below the belt conveyor (1), the through hole (31) is formed in the main body (30), the through hole (31) penetrates through the main body (30), hob cutters (390) are arranged on the side face of the main body (30) at equal intervals, the hob cutters (390) are arranged in a symmetrical spiral sectional structure, telescopic films (391) are fixedly arranged on two sides of the bottom face of the hob cutter (390), the other ends of the telescopic films (391) are fixedly connected with the side face of the main body (30), and a slide rod (392) is fixedly arranged in the middle position of the bottom face of the hob cutter (390), an outer sliding cavity (393) is formed in the outer side of the inner portion of the main body (30), the sliding rod (392) is connected with the outer sliding cavity (393) in a sliding mode, gas is filled into the inner side of the sliding rod (392) in the outer sliding cavity (393), a communication hole (394) is formed in the position, located on the inner side of the outer sliding cavity (393), in the main body (30), an inner sliding cavity (396) is formed in the position, located on the inner side of the communication hole (394), in the inner sliding cavity (396), the inner sliding cavity (396) is communicated with the outer sliding cavity (393) through the communication hole (394), a piston (397) is installed in the inner sliding cavity (396) in a sliding mode, the inner side face of the piston (397) is fixedly connected with one end of the elastic piece (398), and the other end of the elastic piece (398) is fixedly connected with the bottom face of the inner sliding cavity (396).

3. The compound scraping and cleaning system for removing the belt sticky materials of the belt conveyor according to claim 2, is characterized in that: an asymmetric baffle (395) is fixedly arranged on the inner wall of the communication hole (394).

4. The compound scraping and cleaning system for removing the belt sticky materials of the belt conveyor according to claim 2, is characterized in that: the inside movable mounting of through-hole (31) has reposition of redundant personnel seat (32), reposition of redundant personnel seat (32) and main part (30) relative motion, the half cylindricality structure setting of mid portion of reposition of redundant personnel seat (32), little air cavity (33) have been seted up to the intermediate position, little air cavity (33) link up reposition of redundant personnel seat (32).

5. The compound scraping and cleaning system for removing the belt sticky materials of the belt conveyor according to claim 4, is characterized in that: the both ends of reposition of redundant personnel seat (32) are circular baffle structure setting, the position that reposition of redundant personnel seat (32) one side is located circular baffle sets up for closed tubular structure, main part (30) inside is located the position of interior smooth chamber (396) bottom surface and has seted up air hole (399), air hole (399) and interior smooth chamber (396), through-hole (31) intercommunication.

6. The compound scraping and cleaning system for removing the belt sticky materials of the belt conveyor according to claim 4, is characterized in that: the utility model discloses a dust collection device, including main part (30), reposition of redundant personnel seat (32) and main part (30) enclose into atmospheric air chamber (34), suction port (35) have been seted up in the pivot of main part (30), suction port (35) and through-hole (31), atmospheric air chamber (34) intercommunication, dust absorption seat (36) have been cup jointed in the activity in the pivot of main part (30), dust absorption seat (36) and main part (30) relative motion, the inner chamber and suction port (35) intercommunication of dust absorption seat (36), the inner chamber fixed mounting of dust absorption seat (36) has filter screen (37), the last fixed surface of dust absorption seat (36) installs dust absorption mouth (38), dust absorption mouth (38) and the inner chamber intercommunication of dust absorption seat (36).