CN110935700A - Fixed distance dust absorption pole subassembly - Google Patents

Abstract

The invention relates to the technical field of robots, pipeline dust treatment or coal mines, in particular to a fixed-distance dust collection rod assembly which comprises a dust collection pipe and a movable pipe, wherein one end of the dust collection pipe is sleeved with the movable pipe, an elastic part is arranged between the movable pipe and the dust collection pipe, and a roller is arranged at the free end of the movable pipe, so that the distance between the movable pipe and the inner wall of a pipeline cannot be changed, and the distance between the movable pipe and the inner wall of the pipeline cannot be changed no matter whether sundries exist in the pipeline or the cylindricity of the pipeline is changed, so that the suction effect of the dust collection pipe can be ensured to be in a stable range, the height of the dust collection cleaning work of the pipeline is kept unchanged.

Description

Fixed distance dust absorption pole subassembly

Technical Field

The invention relates to the technical field of robots, pipeline dust treatment or coal mines, in particular to a fixed-distance dust collection rod.

Background

In the polishing and grinding operation place, the dust treatment process generated in the production process is mostly treated by intensively pumping into an explosion-proof dust remover. The aluminum powder, magnesium powder, aluminum-magnesium dust, wood dust, etc. produced therein have explosive hazards. When such deposits in the dust removal process exceed 1mm in thickness of the dust extraction duct, explosion of the duct may occur. The 8.2-major explosion accident survey report of Jiangsu Kunshan which occurs recently shows that the direct reason of the accident is that the dust removing system of the accident workshop is not cleaned according to the regulations for a long time and aluminum dust is accumulated. After a fan of the dust removal system is started, high-temperature particles generated in the polishing process form dust cloud above the dust collection barrel, and serial explosion of the dust removal system and a workshop is caused, so that operators at all stations in the whole workshop directly suffer explosion impact, and the group death and group injury are caused.

At present, the pipeline ash removal modes include the following modes:

(1) compressed air stretches into a dust removal pipeline through a rubber pipe to clean dust in the pipeline, the method has limited cleaning space and cannot clean a long-distance dust extraction pipeline, dust is raised by using a compressed air positive pressure blowing method in an explosive dust extraction pipeline, dust cloud is formed, explosion hidden danger exists, and the general requirements of the explosive environment such as GB3836 and electrical equipment for the combustible dust environment such as GB12476 are definitely forbidden;

(2) the ash removal mode that compressed air is concentrated in the blowing pipe and the blowing pipe is embedded in the dust extraction pipeline is adopted, so that the ash removal distance can be prolonged, the ash removal efficiency is low, and the ash removal method is not suitable for explosive dust environment;

(3) stretching around two scalable supporting disks around adopting realizes the ash removal device motion to use the axial brush to scrape the ash, take out the deashing mode of dirt at the device center simultaneously, because the brush rubs with the pipeline inner wall, can arouse the spark, can cause the raise dust simultaneously, have the potential safety hazard, be applicable to explosive dust environment equally.

To above-mentioned problem, can adopt a dust absorption pipe and the one end of dust absorption pipe swings around the circumferencial direction of dust removal pipeline, and the dust absorption is gone on one side in the swing, and the optimal scheme is exactly the swing axis of dust absorption pipe and the coincidence of the axis of pipeline to the distance of dust absorption pipe and pipeline inner wall just can reach the dust absorption effect in presetting the within range, thereby it is poor to cause the dust absorption effect that the suction falls by a wide margin if the distance is too far away. Because sundries may exist in the pipeline, and the roundness is influenced by the change of the inner diameter caused by the manufacture or the use of the pipeline, the distance between the dust suction pipe and the inner wall of the pipeline is changed in the swinging process of the dust suction pipe, so that the dust suction effect is poor due to the exceeding of a preset range, and the cleanness in the pipeline is incomplete.

Disclosure of Invention

The invention aims to: aiming at the problem that the distance between a dust suction pipe and the pipe wall exceeds a preset range and the cleaning is incomplete due to the existence of sundries in the existing pipe or the deformation of the pipe, a fixed-distance dust suction rod is provided.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a fixed distance dust absorption pole subassembly, includes dust absorption pipe and expansion pipe, an pot head of dust absorption pipe is equipped with the expansion pipe, the expansion pipe with be provided with the elastic component between the dust absorption pipe, the free end of expansion pipe is provided with the gyro wheel.

Preferably, the movable pipe sleeve is arranged outside the dust collection pipe, a step part is arranged in the movable pipe, a convex part is arranged outside the dust collection pipe, the elastic part is a spring, one end of the spring is connected with the step part, and the other end of the spring is connected with the convex part.

Preferably, one end of the movable pipe is provided with a dust suction part, and an opening of the dust suction part is in a strip shape.

Preferably, the dust suction portion includes a straight section and a contracted section, the straight section has the same cross-sectional dimension in the axial direction of the movable pipe, the contracted section connects the straight section and the movable pipe, and the contracted section has a cross-sectional dimension in the axial direction of the movable pipe that gradually decreases;

preferably, the roller is arranged on the straight section, and the rolling axis of the roller is parallel to the length direction of the opening.

Preferably, the size of the roller exposed out of the opening is L, and L is more than or equal to 30mm and less than or equal to 50 mm.

The fixed distance dust absorption pole subassembly still includes fixed pipe, the dust absorption pipe includes first pipeline section and the second pipeline section of mutual fixed connection, first pipeline section with the second pipeline section is joined in marriage to the shape of falling L and is arranged, the interval is provided with two baffles in the fixed pipe, thereby first pipeline section passes two thereby the baffle cover is established in the fixed pipe, two cavity between the baffle forms the intercommunication chamber, fixed pipe on with be provided with the second pore on the lateral wall that the intercommunication chamber corresponds, first pipeline section on with be provided with first pore on the lateral wall that the intercommunication chamber corresponds.

Preferably, a sealing member is provided between the first pipe section and the partition plate.

Preferably, the dust absorption pole subassembly still includes quick-witted case and swing cylinder, and the swing cylinder package is swing cylinder or swing hydraulic cylinder, the swing cylinder sets up in the machine case, the transmission shaft of swing cylinder stretches out the machine case just stretches into in the fixed pipe, keeping away from of first pipe section the one end shutoff of second pipe section just extends along the axis with the transmission shaft is connected, fixed pipe with machine case fixed connection adopts the swing cylinder, can go in the dust pipeline, avoids dust explosion.

The application also discloses the subassembly is cleaned to pipeline, including running part and above-mentioned fixed distance dust absorption pole subassembly, fixed distance dust absorption pole subassembly sets up with the mode that can make a round trip to swing on the running part, the running part is used for traveling in the pipeline, fixed distance dust absorption pole subassembly the swing axis with the direction of travel of running part is parallel, fixed distance dust absorption pole subassembly the swing axis with the relative position of pipeline axis is suitable, and this suitable relative position makes fixed distance dust absorption pole subassembly is at the swing in-process fixed distance dust absorption pole subassembly be close to the one end of pipeline inner wall with the distance of pipeline inner wall is not less than 1.5mm and is not more than 3.5 mm.

Preferably, the walking member includes a body frame and at least three rolling members, three of the at least three rolling members are arranged in a triangular state, and the three rolling members are telescopically arranged on the body frame.

Preferably, the rolling element is a roller, a track, a wheel train rolling element composed of rollers or a track rolling element composed of tracks.

Preferably, the angle amplitude value of the back and forth swing of the fixed distance dust collection rod assembly is not less than 60 degrees and not more than 270 degrees, and the angle amplitude value of the back and forth swing is the angle value between two end points of the fixed distance dust collection rod assembly capable of swinging.

Preferably, two of the three rolling members are track rolling elements, and the other rolling member is a train rolling element composed of four rollers.

Preferably, the train rolling element passes through the setting of the flexible part of cross on the body frame, the flexible part of cross includes first pole and second pole, the middle part of first pole with the middle part of second pole is articulated, the one end of first pole with the train rolling element handing-over, the other end of first pole sets up with the mode that can slide on the body frame, the one end of second pole articulates on the body frame, the other end of second pole articulates on the train rolling element.

Preferably, the track rolling body is disposed on the body frame through a y-shaped telescopic member, the y-shaped telescopic member includes a third rod and a fourth rod, a middle portion of the third rod is hinged to one end of the fourth rod, the other end of the fourth rod is hinged to the body frame, one end of the third rod is slidably disposed on the body frame, and the other end of the third rod is hinged to the track rolling body.

Preferably, one end of the telescopic third rod is hinged with the square frame, and the square frame of one crawler rolling body is fixedly connected with the square frame of the other crawler rolling body.

In conclusion, due to the adoption of the technical scheme, the beneficial effects of the application are as follows: the roller is always pressed and held through the elastic piece so that the roller always contacts the inner wall of the pipeline, and the distance of the roller extending out of the movable pipe cannot be changed, so that the distance between the movable pipe and the inner wall of the pipeline cannot be changed, no matter whether sundries or the cylindricity of the pipeline changes, the distance between the movable pipe and the inner wall of the pipeline cannot be changed, the suction effect of the dust suction pipe can be ensured within a stable range, the dust suction cleaning work of the pipeline is kept highly unchanged, and the incomplete cleaning condition is difficult to occur.

Drawings

FIG. 1 is a schematic view of the present invention showing a spacing suction wand assembly;

FIG. 2 is a schematic cross-sectional view of the distance-finding wand assembly of the present application;

FIG. 3 is a schematic view of the first tube section and the movable tube of the distancing suction wand assembly of the present application in combination;

FIG. 4 is a partial enlarged view of A in FIG. 2;

FIG. 5 is a schematic axial view of the dust suction part of the present application;

FIG. 6 is a schematic plan view of the dust suction portion of the present application;

FIG. 7 is a schematic view of the construction of the pipe cleaning element of the present application;

FIG. 8 is a schematic view of FIG. 7 taken along line A;

FIG. 9 is a view taken along line B of FIG. 7;

FIG. 10 is a schematic view of the cross member of the present application;

FIG. 11 is a schematic view of the structure of the pipe cleaning member of the present application, as viewed from below in FIG. 1, in comparison with FIG. 1;

FIG. 12 is an enlarged view of a portion C of FIG. 11;

FIG. 13 is a sectioned axial view of the pipe cleaning member of the present application;

FIG. 14 is an enlarged view of a portion D of FIG. 13;

the labels in the figure are: 100-walking part, 110-body frame, 120-rolling part, 121-gear train rolling body, 122-crawler rolling body, 123-fixing plate, 124-strip hole, 125-first shaft, 126-n-shaped frame, 127-first slide rail, 200-distance dust suction rod assembly, 210-dust suction pipe, 211-first pipe section, 2111-first duct, 212-second pipe section, 2121-convex part, 220-fixing pipe, 221-communicating cavity, 222-partition plate, 223-second duct, 230-movable pipe, 231-dust suction part, 2311-straight section, 2312-contracted section, 2313-straight pipe section, 232-roller, 233-step part, 234-limiting part, 240-elastic part, 251-machine box, 252-oscillating cylinder, 2521-a transmission shaft, a 300-y-shaped telescopic component, a 400-cross-shaped telescopic component, 510-a hand wheel, 410-a first rod, 420-a second rod, 310-a third rod, 320-a fourth rod, 330-a square frame, 340-a second sliding rail, 350-a connecting plate and 360-a driving shaft.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 6, a fixed distance dust suction rod assembly 200 includes a housing 251, a swing cylinder 252, a fixed pipe 220, a dust suction pipe 210, a movable pipe 230, and a roller 232 provided at a free end of the movable pipe 230.

Referring to fig. 2 and 3, the free end of the dust collection pipe 210 is sleeved with the movable pipe 230, an elastic member 240 is arranged between the movable pipe 230 and the dust collection pipe 210, and a roller 232 is fixedly arranged at the free end of the movable pipe 230, so that the roller 232 is always pressed and held under the action of the elastic member 240 to enable the roller 232 to always contact the inner wall of the pipeline, and the distance between the roller 232 and the movable pipe 230 does not change because the distance between the roller 230 and the inner wall of the pipeline does not change, and therefore, the suction effect of the dust collection pipe 210 can be ensured to be within a stable range no matter whether sundries or the cylindricity of the pipeline changes, and the incomplete cleaning of the pipeline is difficult to occur.

Referring to fig. 3, the movable tube 230 is sleeved outside the dust suction tube 210 to avoid affecting the inner diameter of the dust suction tube, so that the suction is smooth, a step portion 233 is disposed in the movable tube 230, a protrusion 2121 is disposed outside the dust suction tube 210, the elastic member 240 is a spring, one end of the spring is connected to the step portion 233, and the other end of the spring is connected to the protrusion 2121, so that the first tube segment 211 presses and holds the spring, so that the roller 232 is tightly attached to the inner wall of the pipe, in addition, in order to further form a pressing and holding effect of the spring, a limiting member 234 is disposed on the movable tube 230 to limit the movement of the protrusion 2121, one side of the protrusion 2121 is connected to the spring, the other side of the protrusion 2121 is adjacent to the limiting member 234, the limiting member 234 may be a pin or a screw, and the.

Referring to fig. 2 and 5, one end of the movable tube 230 is provided with a dust suction portion 231, the opening of the dust suction portion 231 is in a strip shape, the length direction of the opening is parallel to the axis of the pipeline, thereby, dust in the pipeline can be cleaned more quickly, specifically, the cleaning assembly depends on a certain walking component 100 to walk in the pipeline, the walking component 100 moves in the pipeline along the axis while the dust suction tube 210 swings, the dust suction tube 210 moves in a zigzag shape relative to the pipeline, if the opening length is too short and the walking component 100 walks faster, a blank and uncleaned area can appear during the movement of the dust suction tube 210, thereby causing incomplete cleaning, the opening adopts a strip-shaped opening, under the condition that the cross-sectional area is the same, the strip-shaped opening enables the walking speed of the walking component 100 to be faster.

As shown in fig. 4 and 5, the dust suction portion 231 includes a straight section 2311, a contracted section 2312 and a straight section 2313, the cross-sectional dimension of the straight section 2311 in the axial direction of the movable tube 230 is the same everywhere, the contracted section 2312 connects the straight section 2311 and the straight section 2313, the straight section 2313 is in sleeved sealing fit with the movable tube 230, the cross-sectional dimension of the contracted section 2312 in the axial direction of the movable tube 230 is gradually reduced, the roller 232 is arranged on the straight section 2311, the rolling axis of the roller 232 is parallel to the length direction of the opening, as shown in fig. 6, the exposed opening of the roller 232 has a dimension L, L is greater than or equal to 30mm and less than or equal to 50mm, and the air volume is greater than or equal to.

As shown in fig. 2, the dust suction pipe 210 includes a first pipe section and a second pipe section fixedly connected with each other, the first pipe section and the second pipe section are combined into an inverted L-shaped arrangement, two partition plates 222 are arranged at intervals in the fixed pipe 220, the first pipe section passes through the two partition plates 222 and is sleeved in the fixed pipe 220, a communicating cavity 221 is formed in a cavity between the two partition plates 222, a second hole passage 223 is arranged on a side wall of the fixed pipe 220 corresponding to the communicating cavity 221, the second hole passage 223 is used for connecting with a dust suction hose, and a first hole passage 2111 is arranged on a side wall of the first pipe section corresponding to the communicating cavity 221; the swing cylinder 252 is disposed in the chassis 251, a transmission shaft 2521 of the swing cylinder 252 extends out of the chassis 251 and into the fixed pipe 220, an end of the first pipe segment 211, which is away from the second pipe segment 212, is sealed and extends along the axis and is connected to the transmission shaft 2521, the fixed pipe 220 is fixedly connected to the chassis 251, and thus, the swing cylinder 252 is activated to drive the transmission shaft 2521 to rotate, so that the first pipe segment 211 rotates relative to the fixed pipe 220, that is, the dust suction pipe 210 rotates relative to the fixed pipe 220, and the swing cylinder 252 drives the transmission shaft 2521 to swing back and forth, so that the dust suction pipe 210 performs a swinging motion relative to the fixed pipe 220.

Referring to an arrow in fig. 2, the arrow indicates an airflow direction during dust collection, after the second duct 223 is connected to the dust collection hose, the dust collection hose generates negative pressure, so that the free end of the dust collection pipe 210 sucks the airflow into the second pipe section 212, then enters the first pipe section 211, enters the communication cavity 221 through the first duct 2111 arranged on the first pipe section 211, and then enters the dust collection hose through the second duct 223, because the fixing pipe 220 is fixed on the case 251, the dust collection pipe 210 hose cannot swing along with the dust collection pipe 210 when the dust collection pipe 210 swings, compared with a scheme that the dust collection hose swings along with the dust collection hose, the swing cylinder 252 has smaller driving resistance and saves more energy, and the dust collection hose cannot swing along with the dust collection hose and can be fixed so as not to interfere with other components.

Of course, the first pipe segment 211 is fixedly connected with the transmission shaft 2521, but may be movably connected with a limited moving range, which is a moving range along the axial direction of the transmission shaft 2521, but the limited moving range does not cause air leakage of the communication cavity 221, and the fixed connection is preferably adopted. A sealing member is disposed between the first pipe segment 211 and the partition 222 to improve the sealing performance of the communicating cavity 221, and the sealing member may be a sealing ring or other dynamic sealing structure in the prior art.

Referring to fig. 7 to 9, a pipe cleaning assembly includes a walking part 100 and the fixed distance dust suction rod assembly 200, the fixed distance dust suction rod assembly 200 is arranged on the walking part 100 in a manner of swinging back and forth, the walking part 100 is used for running in a pipe, a swinging axis of the fixed distance dust suction rod assembly 200 is parallel to a running direction of the walking part 100, a relative position of the swinging axis of the fixed distance dust suction rod assembly 200 and a pipe axis is proper, and the proper relative position enables a distance between one end of the fixed distance dust suction rod assembly 200 close to the inner wall of the pipe and the inner wall of the pipe to be not less than 1.5mm and not more than 3.5mm in the swinging process of the fixed distance dust suction rod assembly 200. The distance-fixed dust collection rod assembly 200 is used for cleaning accumulated dust in the pipeline in a negative-pressure dust collection mode without contacting with the pipe wall, the distance-fixed dust collection rod assembly 200 cannot rub with the pipe wall, and therefore the danger of combustible dust explosion caused by friction in the cleaning process is smaller, and the negative-pressure adsorption mode is adopted, so that the dust in the pipeline cannot be raised, and dust explosion cannot be caused; in addition, because the dust absorption amount of wind is less, can provide bigger negative pressure, under the unchangeable condition of dust absorption power, can provide bigger dust absorption negative pressure, improved the deashing efficiency. .

The amplitude value of the angle at which the fixed distance suction bar assembly 200 swings back and forth is not less than 60 ° and not less than 270 °, and particularly, the amplitude value of the swing of the fixed distance suction bar assembly 200 is 90 °, 120 °, 180 °, or 240 °. .

The walking member 100 comprises a body frame 110 and at least three rolling members 120, wherein three rolling members 120 of the at least three rolling members 120 are arranged in a triangular state, and the three rolling members 120 are all arranged on the body frame 110 in a telescopic manner, so that the telescopic manner can adapt to pipelines with different pipe diameters, and meanwhile, the positions of the swinging members and the pipeline axes can be adjusted.

Specifically, the rolling member 120 is a roller 232, a track, a wheel train composed of the roller 232, or a wheel train composed of the track.

Referring to fig. 7 and 8, two of the three rolling members 120 are caterpillar tracks, which are wheel belt rolling bodies, and the other is a wheel train composed of four rollers 232, which is a wheel train rolling body 121, as shown in fig. 1, the four wheel train rolling bodies 121 are fixed at four corners of the fixing plate 123 and arranged in a quadrilateral shape, the fixing plate 123 is disposed on the body frame 110 through the cross-shaped telescopic member 400, two sides of the fixing plate 123 are respectively provided with one cross-shaped telescopic member 400, as shown in fig. 3, the cross-shaped telescopic member 400 includes a first rod 410 and a second rod 420, a middle portion of the first rod 410 is hinged to a middle portion of the second rod 420, one end of the first rod 410 is hinged to the wheel train rolling body 121, the other end of the first rod 410 is slidably disposed on the body frame 110, one end of the second rod 420 is hinged to the body frame 110, and the other end of the second rod 420 is.

The second rods 420 are connected to the fixing plate 123, referring to fig. 9 and 10, the fixing plate 123 is provided with strip holes 124 at both sides, a first shaft 125 is fixedly connected to one ends of the two second rods 420, the two second rods 420 are respectively disposed at both sides of the fixing plate 123 and adjacent to the inner side surfaces of both sides of the fixing plate 123, both ends of the first shaft 125 are exposed after being fixedly connected to the second rods 420, the exposed first shaft 125 is engaged with the strip holes 124 and can slide and roll in the strip holes 124, because there is a second rod 420 at both ends of the first shaft 125 and the two second rods 420 are respectively adjacent to the inner side surfaces of the fixing plate 123, the first shaft 125 cannot be deviated too much along the axis of the first shaft 125 to be separated from the strip holes 124, and of course, the first shaft 125 is detachably and fixedly connected to the second rods 420.

The first rods 410 are connected with the body frame 110, referring to fig. 7 and 13, the body frame 110 is provided with first slide rails 127, one end of each of the two first rods 410 is hinged to two sides of one n-shaped frame 126, the n-shaped frames 126 are matched with the slide rails so that the n-shaped frames 126 can slide on the slide rails, the n-shaped frames 126 are provided with swing cylinders 252 to drive the n-shaped frames 126 to slide on the slide rails, and the driving in the slide rail mode is more in the prior art and is not repeated here.

Referring to fig. 7, 8 and 9, the track rolling body 122 is disposed on the body frame 110 through a y-shaped telescopic member 300, two y-shaped telescopic members 300 form a group, a group of y-shaped telescopic members 300 is disposed at both ends of the track rolling body 122, referring to fig. 5-7, the y-shaped telescopic member 300 includes a third rod 310 and a fourth rod 320, a middle portion of the third rod 310 is hinged to one end of the fourth rod 320, the other end of the fourth rod 320 is hinged to the body frame 110, one end of the third rod 310 is slidably disposed on the body frame 110, and the other end of the third rod 310 is hinged to the track rolling body 122.

The third rod 310 is slidably disposed on the body frame 110, referring to fig. 11-12, a second slide rail 340 is disposed on the body frame 110, one end of each of two third rods 310 in a group of y-shaped telescopic members 300 is hinged to two sides of the square frame, the square frame 330 is matched with the second slide rail 340, both the two square frames 330 are connected to a connecting plate 350, as shown in fig. 11 and 12, a group of y-shaped telescopic members 300 of one track rolling body 122 is fixedly connected to a group of y-shaped telescopic members 300 of another track rolling body 122, one track rolling body 122 is driven to extend and retract by using two groups of y-shaped telescopic members 300, and two groups of y-shaped telescopic members 300 of one track rolling body 122 are connected to two groups of y-shaped telescopic members 300 of another track rolling body 122 by the connecting plate 350, so as to achieve synchronous extension and retraction of the two track rolling bodies 122.

Specifically, the power device for driving synchronous stretching comprises a driving shaft 360 capable of pivoting around the axis of the power device, the driving shaft 360 is in threaded fit with a connecting plate 350, so that the driving shaft 360 is rotated, the connecting plate 350 can move along the axis of the driving shaft 360, the square-shaped frame 330 is driven to slide on the second sliding rail 340, and the synchronous stretching of the two crawler rolling bodies 122 is realized.

One end of the third rod 310 of one of the track rolling bodies 122 is fixedly connected to one end of the third rod 310 of the other track rolling body 122, and the one end of the third rod 310 is the end of the third rod 310 slidably connected to the telescopic body frame 110.

Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a certain distance dust absorption pole subassembly, characterized in that, includes dust absorption pipe (210) and movable tube (230), the pot head of dust absorption pipe (210) is equipped with movable tube (230), movable tube (230) with be provided with elastic component (240) between dust absorption pipe (210), the free end of movable tube (230) is provided with gyro wheel (232).

2. The fixed-distance dust suction rod assembly according to claim 1, wherein the movable tube (230) is sleeved outside the dust suction tube (210), a step part (233) is arranged in the movable tube (230), a convex part (2121) is arranged outside the dust suction tube (210), the elastic part (240) is a spring, one end of the spring is connected with the step part (233), and the other end of the spring is connected with the convex part (2121).

3. The assembly according to claim 1, wherein a dust suction portion (231) is disposed at one end of the movable tube (230), and the opening of the dust suction portion (231) is in the shape of a bar.

4. The distance suction wand assembly according to claim 3, wherein said suction portion (231) comprises a straight section (2311) and a reduced section (2312), a sectional dimension of said straight section (2311) in an axial direction of said movable tube (230) is the same throughout, said reduced section (2312) connects said straight section (2311) and said movable tube (230), and a sectional dimension of said reduced section (2312) in an axial direction of said movable tube (230) is gradually reduced.

5. The distancing suction wand assembly according to claim 4, wherein the roller (232) is arranged on the straight section (2311), the rolling axis of the roller (232) being parallel to the length direction of the opening.

6. The assembly according to claim 3, wherein the roller (232) has a dimension L of less than or equal to 30mm and less than or equal to 50mm when exposed from the opening.

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