CN114354335A

CN114354335A - Material mechanical property universal tester with safety protection function

Info

Publication number: CN114354335A
Application number: CN202210006538.8A
Authority: CN
Inventors: 薛清华; 王为; 杨平国; 李健
Original assignee: Chongqing Luodi New Material Technology Co ltd
Current assignee: Chongqing Luodi New Material Technology Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-04-15
Anticipated expiration: 2042-01-05
Also published as: CN114354335B

Abstract

The invention discloses a material mechanical property universal testing machine with a safety protection function, which comprises a bottom box, a top plate and an auxiliary plate, wherein a plurality of screw rods are arranged on the top of the bottom box in a penetrating manner, the top plate is arranged on the top of each screw rod, the auxiliary plate is arranged on the outer wall of each screw rod, a lubricating box is arranged on the top of each auxiliary plate, a lubricating pipe is arranged on the bottom of each lubricating box in a penetrating manner, and an air suction pump is arranged on the inner wall of the bottom box. The protective box can protect workers by being provided with the protective box, when the device starts to work, the first motor is started, the first motor rotates to drive the first shaft to rotate, meanwhile, the protective net moves downwards under the driving of the connecting line and the balancing weight, and the protective net is conveyed to the outside of the protective box through the second shaft on the auxiliary frame, so that the protective net can protect the outside of the device and prevent the workers from being injured.

Description

Material mechanical property universal tester with safety protection function

Technical Field

The invention relates to the technical field of testing machines, in particular to a material mechanical property universal testing machine with a safety protection function.

Background

A universal tester for testing the mechanical properties of metallic or non-metallic materials is an ideal tester for the departments of industrial and mining enterprises, scientific research units, colleges and universities, and engineering quality supervision station, and features wide measuring range, high precision and response speed. The working is reliable, the efficiency is high, and the test data can be displayed, recorded and printed in real time.

The existing universal testing machine has the following defects:

1. patent document CN111829882A discloses a universal testing machine, "a moving mechanism is fixedly installed on a fixed frame, and the moving mechanism is connected with a detection platform in a driving manner; the lifting mechanism is fixedly arranged in the fixed frame and is connected with the cross beam in a driving way; the first testing assembly is arranged on the cross beam; the first testing component comprises a tension sensor and a drawing head; the tension sensor is connected with the cross beam in a sliding manner, one end of the drawing head is movably connected with the tension sensor, and the other end of the drawing head is detachably connected with the drawing block; the base material test block comprises a plurality of tested units; the units to be tested are distributed on the same surface of the base material test block. By adopting the universal testing machine, a plurality of groups of tested units can be manufactured on the surface of one substrate test block, the uniformity of the surface flatness and the strength of the substrate test block is good, the accuracy and the effectiveness of detection data are improved, the test is carried out until a plurality of tested units are mounted at one time, and the detection efficiency of the tested units is improved, but the device is lack of a protection structure for workers and is not safe enough when in use;

2. patent document CN111766143A discloses a universal testing machine, "relates to the technical field of material mechanical property detection equipment, and aims to solve the problem that the fixture of the universal testing machine before improvement is inconvenient to replace and the detection efficiency is affected. The clamping device comprises a clamping mechanism, the clamping mechanism comprises a sheave assembly, the sheave assembly comprises a sheave and a drive plate for stirring the sheave to rotate intermittently, a plurality of clamps with different specifications are detachably arranged on the sheave, and each clamp is arranged corresponding to one guide groove of the sheave; the clamping device further comprises a fixing mechanism, the fixing mechanism can fix the grooved wheel, and when the fixing mechanism fixes the grooved wheel, the clamp close to the fixing mechanism is located at the center of the movable plate. The device has the effects of facilitating clamp replacement and improving detection efficiency, but the device is lack of an automatic lubricating structure, so that manual lubrication of workers is required for each time of lubrication, and the labor burden of the workers is increased;

3. patent document CN111537335A discloses a single-space universal tester, "its technical essential is: including testing machine body, fixed jaw and removal keep silent, fixed jaw and remove and install the survey device between keeping silent, the survey device includes positioner and range finding sensor, install the encoder between crossbeam and the back timber, positioner sets up on fixed jaw, the solid setting of laser centering sensor is on removing jaw, positioner includes fixing base, weighing sensor, dish and support frame of weighing, the fixing base is installed on fixed jaw, weighing sensor installs on the fixing base, the dish of weighing sets up at the weighing sensor upside, the support frame is fixed on the dish of weighing, fixed jaw inner wall and removal keep the parallel and level with positioner and range finding sensor's last edge and lower edge respectively. According to the invention, the accurate jaw distance is directly positioned through the weighing sensor and the laser centering sensor, and the theoretical deviation of the tested bar is measured, but the device is lack of a dust removal structure and a cleaning structure, so that more impurities such as scraps and the like often exist after the experiment is finished, and the device is required to be manually cleaned by workers and is inconvenient.

Disclosure of Invention

The invention aims to provide a material mechanical property universal testing machine with a safety protection function, and aims to solve the problems of lack of a protection structure, a self-lubricating structure and a cleaning structure in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a material mechanical property universal testing machine with a safety protection function comprises a bottom box, a top plate and an auxiliary plate, wherein a plurality of lead screws penetrate through the top of the bottom box, and the top plate is arranged on the top of each lead screw;

the protection box is mounted at the top of the top plate, a plurality of groups of fixing frames are mounted on the inner wall of the protection box, a first shaft is mounted on the inner wall of each fixing frame, a first motor is mounted on the outer wall of each fixing frame, the output end of the first motor is connected with one end of the first shaft, a protective net is mounted on the outer wall of each first shaft in a surrounding mode, an auxiliary frame is mounted on the outer wall of the protection box, a second shaft is mounted on the inner wall of the auxiliary frame, a mounting bar is mounted at one end of the protective net, a connecting line is mounted on the inner wall of the mounting bar, and a balancing weight is mounted at one end of the connecting line;

an auxiliary plate is installed on the outer wall of the screw rod, a lubricating box is installed on the top of the auxiliary plate, a lubricating pipe is installed on the bottom of the lubricating box in a penetrating mode, and an air suction pump is installed on the inner wall of the bottom box.

Preferably, the inner wall of the bottom box is provided with a supporting plate, the top of the supporting plate is provided with a second motor, and the output end of the second motor is connected with the bottom of the screw rod.

Preferably, the clamp holder is installed at the top of the auxiliary plate, the clamping groove is formed in the top of the clamp holder, the fixed shaft is installed on the inner wall of the clamping groove, the clamping plate is installed on the outer wall of the fixed shaft, the electric telescopic rod is installed on the inner wall of the clamp holder, and one end of the electric telescopic rod is connected with the outer wall of the clamping plate.

Preferably, the division board is installed to the inner wall of lubrication box, and the detector is installed at the top of division board, and the detection film is installed to the outer wall of detector, and the carriage release lever is installed to the outer wall of detection film, and the conducting block is installed to the one end of carriage release lever, and the roof of the inside of detector is installed and is triggered the board, triggers the outer wall of board and installs two sets of electrically conductive holes.

Preferably, the outer wall of the lubricating pipe is provided with a control valve, the inner wall of the control valve is provided with a fixing plate, the top of the fixing plate is provided with a through hole, and the outer wall of the control valve is provided with a mounting plate.

Preferably, the bottom of mounting panel is installed the third motor, and the cam is installed to the output of third motor, and the inner wall of control valve runs through the closing plate of installing the T type, and the outer wall of closing plate is encircleed and is installed the spring, and the bottom of closing plate is installed sealed the piece.

Preferably, a first filter screen is installed to the inside diapire of under casing, and the fixed strip is installed to the inner wall of under casing, and the axis of rotation is installed to the inner wall of fixed strip, and the gyro wheel is installed to the outer wall of axis of rotation, and the collecting box is installed at the top of gyro wheel.

Preferably, the second filter screen is installed on the outer wall of the collection box, the dust removal pipe is installed on the outer wall of the collection box, one end of the dust removal pipe extends out of the outer wall of the bottom box, and the telescopic pipe is installed at one end of the dust removal pipe.

Compared with the prior art, the invention has the beneficial effects that:

1. the protection box can protect workers by being provided with the protection box, when the device starts to work, the first motor is started, the first motor rotates to drive the first shaft to rotate, meanwhile, the protection net moves downwards under the driving of the connecting line and the balancing weight, and the protection net is conveyed to the outside of the protection box through the second shaft on the auxiliary frame, so that the protection net can protect the outside of the device and prevent the workers from being injured;

2. the device can be lubricated by installing the lubricating box, when the device is lubricated, the third motor is started, the third motor rotates to drive the cam to rotate, the cam rotates to drive the sealing plate to move repeatedly, the spring contracts and extends, the sealing plate drives the sealing block to shield the through hole on the fixing plate, lubricating oil cannot flow out of the lubricating tube, when the sealing block is not shielded, the lubricating oil can flow out and flow to the outer wall of the lead screw through the lubricating oil buried in the auxiliary plate, so that the lubricating function is realized, when the content of the lubricating oil is reduced, the detection film expands, the detection film drives the movable rod to move, the movable rod drives the conductive block to move out of the conductive hole, the trigger plate is powered off, a corresponding electric signal is displayed on a related control device, and the lubricating oil is convenient to be added in time;

3. according to the invention, the air pump and the collection box are arranged to clean impurities, when cleaning and dedusting are carried out, a worker can hold the telescopic pipe, the telescopic pipe can be stretched and retracted, the telescopic pipe is aligned to a part to be cleaned, then the air pump is started, the air pump enables the interior of the collection box to be in negative pressure, impurities are sucked into the collection box, the first filter screen and the second filter screen can block the impurities, and the collection box can be conveniently taken out by the roller, so that the cleaning is convenient.

Drawings

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

FIG. 2 is a schematic view of a bottom case portion of the present invention;

FIG. 3 is a schematic top view of the protective case of the present invention;

FIG. 4 is a schematic view of a partial structure of the holder of the present invention;

FIG. 5 is a schematic view of a portion of the lubrication box of the present invention;

FIG. 6 is a schematic view of a portion of the control valve of the present invention;

FIG. 7 is a schematic view of the structure of part A in FIG. 5 according to the present invention.

In the figure: 1. a bottom box; 101. a support plate; 102. a second motor; 103. a lead screw; 2. a top plate; 201. a protective box; 202. a fixed mount; 203. a first shaft; 204. a first motor; 205. a protective net; 206. an auxiliary frame; 207. a second shaft; 208. mounting a bar; 209. a connecting wire; 210. a balancing weight; 3. an auxiliary plate; 301. a holder; 302. a clamping groove; 303. a fixed shaft; 304. a clamping plate; 305. an electric telescopic rod; 4. a lubrication box; 401. a partition plate; 402. a detector; 403. a detection membrane; 404. a trigger plate; 405. a conductive via; 406. a travel bar; 407. a conductive block; 5. a lubrication tube; 501. a control valve; 502. a fixing plate; 503. a through hole; 6. mounting a plate; 601. a third motor; 602. a sealing plate; 603. a spring; 604. a sealing block; 7. an air pump; 701. a first filter screen; 702. a fixing strip; 703. a roller; 8. a collection box; 801. a second filter screen; 802. a telescopic tube.

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.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1: referring to fig. 1 and fig. 2, an embodiment of the present invention: the utility model provides a mechanical properties of material universal tester with safety protection function, includes under casing 1, roof 2, accessory plate 3, a plurality of lead screws 103 are installed to the top of under casing 1 run through, roof 2 is installed at the top of lead screw 103, accessory plate 3 is installed to the outer wall of lead screw 103, lubricated case 4 is installed at the top of accessory plate 3, lubricated pipe 5 is installed to the bottom of lubricated case 4 is run through to be used to install, aspiration pump 7 is installed to the inner wall of under casing 1, backup pad 101 is installed to the inner wall of under casing 1, and second motor 102 is installed at the top of backup pad 101, and the output of second motor 102 is connected with the bottom of lead screw 103, and second motor 102 rotates and drives lead screw 103 and rotate, and lead screw 103 rotates and can drive accessory plate 3 and reciprocate, conveniently adjusts.

Example 2: referring to fig. 1 and 3, an embodiment of the present invention: a material mechanical property universal tester with a safety protection function is characterized in that a protection box 201 is installed at the top of a top plate 2, a plurality of groups of fixing frames 202 are installed on the inner wall of the protection box 201, a first shaft 203 is installed on the inner wall of each fixing frame 202, a first motor 204 is installed on the outer wall of each fixing frame 202, the output end of each first motor 204 is connected with one end of the corresponding first shaft 203, a protective net 205 is installed on the outer wall of each first shaft 203 in a surrounding mode, an auxiliary frame 206 is installed on the outer wall of each protection box 201, a second shaft 207 is installed on the inner wall of each auxiliary frame 206, an installation strip 208 is installed at one end of each protective net 205, a connecting line 209 is installed on the inner wall of each installation strip 208, a balancing weight 210 is installed at one end of each connecting line 209, when the device starts to work, the first motor 204 is started, the first motor 204 rotates to drive the first shafts 203 to rotate, and meanwhile, the protective nets 205 move downwards under the drive of the connecting lines 209 and the balancing weights 210, the protection net 205 is conveyed to the outside of the protection box 201 through a second shaft 207 on the auxiliary frame 206, so that the protection net 205 can protect the outside of the device and prevent people from being injured.

Example 3: referring to fig. 4, an embodiment of the present invention: the utility model provides a mechanical properties of material universal tester with safety protection function, holder 301 is installed at the top of accessory plate 3, holder 301's top is equipped with centre gripping groove 302, fixed axle 303 is installed to the inner wall of centre gripping groove 302, grip block 304 is installed to the outer wall of fixed axle 303, electric telescopic handle 305 is installed to holder 301's inner wall, and electric telescopic handle 305's one end and grip block 304's outer wall connection, when carrying out the centre gripping to the article, place the inside at centre gripping groove 302 with the article, start electric telescopic handle 305, electric telescopic handle 305 contracts and drives the bottom of grip block 304 and rotate, grip block 304's bottom is rotated because the effect of fixed axle 303 can make grip block 304's top be close to each other, thereby realize clamping function.

Example 4: referring to fig. 5, fig. 6 and fig. 7, an embodiment of the present invention: a material mechanical property universal tester with a safety protection function is characterized in that a partition plate 401 is installed on the inner wall of a lubricating box 4, a detector 402 is installed on the top of the partition plate 401, a detection film 403 is installed on the outer wall of the detector 402, a moving rod 406 is installed on the outer wall of the detection film 403, a conductive block 407 is installed at one end of the moving rod 406, a trigger plate 404 is installed on the top wall of the interior of the detector 402, two groups of conductive holes 405 are installed on the outer wall of the trigger plate 404, a control valve 501 is installed on the outer wall of a lubricating pipe 5, a fixing plate 502 is installed on the inner wall of the control valve 501, a through hole 503 is formed in the top of the fixing plate 502, a mounting plate 6 is installed on the outer wall of the control valve 501, a third motor 601 is installed at the bottom of the mounting plate 6, a cam is installed at the output end of the third motor 601, a T-shaped sealing plate 602 is installed on the inner wall of the control valve 501 in a penetrating manner, and a spring 603 is installed around the outer wall of the sealing plate 602, sealing block 604 is installed to the bottom of sealing plate 602, when lubricating, start third motor 601, third motor 601 rotates and drives the cam rotation, the cam rotates and drives sealing plate 602 and remove repeatedly, the extension of spring 603 shrink, when sealing plate 602 drives sealing block 604 and shelters from through hole 503 on the fixed plate 502, lubricating oil can not flow out to the inside of lubricated pipe 5, when sealing block 604 does not shelter from, lubricating oil can flow out and flow to the outer wall of lead screw 103 through the lubricating oil that buries in the inside of accessory plate 3, realize lubricating function, when lubricating oil content reduces, detection membrane 403 relaxes, detection membrane 403 drives movable rod 406 and removes, movable rod 406 drives conducting block 407 and shifts out from conducting hole 405, trigger board 404 cuts off the power supply, make corresponding signal of telecommunication show on relevant controlling means, conveniently in time add lubricating oil.

Example 5: referring to fig. 2, an embodiment of the present invention: a material mechanical property universal testing machine with a safety protection function is characterized in that a first filter screen 701 is installed on the inner bottom wall of a bottom box 1, a fixing strip 702 is installed on the inner wall of the bottom box 1, a rotating shaft is installed on the inner wall of the fixing strip 702, a roller 703 is installed on the outer wall of the rotating shaft, a collecting box 8 is installed at the top of the roller 703, a second filter screen 801 is installed on the outer wall of the collecting box 8, a dust removal pipe is installed on the outer wall of the collecting box 8, one end of the dust removal pipe extends out of the outer wall of the bottom box 1, a telescopic pipe 802 is installed at one end of the dust removal pipe, when cleaning and dust removal are carried out, a worker can hold the telescopic pipe 802 in a hand and can stretch out and draw back to align the telescopic pipe 802 to a part needing to be cleaned, then a suction pump 7 is started, the suction pump 7 enables negative pressure in the collecting box 8 to suck sundries into the collecting box 8, and the first filter screen 701 and the second filter screen 801 can block the sundries, the roller 703 can conveniently take out the collecting box 8, and is convenient to clean.

The working principle is that when the device starts to work, the first motor 204 is started, the first motor 204 rotates to drive the first shaft 203 to rotate, meanwhile, the protective net 205 moves downwards under the drive of the connecting wire 209 and the balancing weight 210, the protective net 205 is conveyed to the outside of the protective box 201 through the second shaft 207 on the auxiliary frame 206, so that the protective net 205 can protect the outside of the device and prevent people from being injured, when lubrication is performed, the third motor 601 is started, the third motor 601 rotates to drive the cam to rotate, the cam rotates to drive the sealing plate 602 to move repeatedly, the spring 603 contracts and extends, when the sealing plate 602 drives the sealing block 604 to shield the through hole 503 on the fixing plate 502, the lubricating oil cannot flow into the lubricating pipe 5, when the sealing block 604 is not shielded, the lubricating oil can flow out and flow to the outer wall of the screw 103 through the lubricating oil buried in the auxiliary plate 3, so as to realize the lubricating function, when the content of the lubricating oil is reduced, detection membrane 403 diastole, detection membrane 403 drives movable rod 406 and removes, movable rod 406 drives conducting block 407 and shifts out from electrically conductive hole 405, trigger board 404 outage, make corresponding signal of telecommunication show on relevant controlling means, conveniently in time add lubricating oil, when cleaning the dust removal, the flexible pipe 802 that the staff can hand, flexible pipe 802 can stretch out and draw back, aim at the clear part of needs with flexible pipe 802, start aspiration pump 7 afterwards, aspiration pump 7 makes the inside negative pressure of collecting box 8, debris are inhaled to the inside of collecting box 8, first filter screen 701 and second filter screen 801 can block debris, gyro wheel 703 can conveniently take out collecting box 8, convenient clearance.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a mechanical properties of material universal tester with safety protection function, includes under casing (1), roof (2), accessory plate (3), its characterized in that: a plurality of lead screws (103) are installed at the top of the bottom box (1) in a penetrating mode, and top plates (2) are installed at the tops of the lead screws (103);

the protection box (201) is installed at the top of the top plate (2), a plurality of groups of fixing frames (202) are installed on the inner wall of each protection box (201), a first shaft (203) is installed on the inner wall of each fixing frame (202), a first motor (204) is installed on the outer wall of each fixing frame (202), the output end of each first motor (204) is connected with one end of the corresponding first shaft (203), a protective net (205) is installed on the outer wall of each first shaft (203) in a surrounding mode, an auxiliary frame (206) is installed on the outer wall of each protection box (201), a second shaft (207) is installed on the inner wall of each auxiliary frame (206), an installation strip (208) is installed at one end of each protective net (205), a connecting wire (209) is installed on the inner wall of each installation strip (208), and a balancing weight (210) is installed at one end of each connecting wire (209);

an auxiliary plate (3) is installed on the outer wall of the lead screw (103), a lubricating box (4) is installed at the top of the auxiliary plate (3), a lubricating pipe (5) is installed at the bottom of the lubricating box (4) in a penetrating mode, and an air suction pump (7) is installed on the inner wall of the bottom box (1).

2. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 1, wherein: the inner wall of the bottom box (1) is provided with a supporting plate (101), the top of the supporting plate (101) is provided with a second motor (102), and the output end of the second motor (102) is connected with the bottom of the screw rod (103).

3. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 1, wherein: the clamping device (301) is installed at the top of the auxiliary plate (3), the clamping groove (302) is formed in the top of the clamping device (301), the fixing shaft (303) is installed on the inner wall of the clamping groove (302), the clamping plate (304) is installed on the outer wall of the fixing shaft (303), the electric telescopic rod (305) is installed on the inner wall of the clamping device (301), and one end of the electric telescopic rod (305) is connected with the outer wall of the clamping plate (304).

4. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 1, wherein: partition plate (401) is installed to the inner wall of lubrication box (4), detector (402) are installed at the top of partition plate (401), detecting film (403) is installed to the outer wall of detector (402), carriage release lever (406) is installed to the outer wall of detecting film (403), conducting block (407) are installed to the one end of carriage release lever (406), trigger plate (404) is installed to the roof of the inside of detector (402), two sets of electrically conductive hole (405) are installed to the outer wall of trigger plate (404).

5. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 1, wherein: the lubricating device is characterized in that a control valve (501) is installed on the outer wall of the lubricating pipe (5), a fixing plate (502) is installed on the inner wall of the control valve (501), a through hole (503) is formed in the top of the fixing plate (502), and a mounting plate (6) is installed on the outer wall of the control valve (501).

6. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 5, wherein: the bottom of mounting panel (6) is installed third motor (601), and the cam is installed to the output of third motor (601), and the inner wall of control valve (501) runs through and installs sealing plate (602) of T type, and spring (603) are installed in the outer wall encircleing of sealing plate (602), and sealing block (604) are installed to the bottom of sealing plate (602).

7. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 1, wherein: first filter screen (701) are installed to the inside diapire of under casing (1), and fixed strip (702) are installed to the inner wall of under casing (1), and the axis of rotation is installed to the inner wall of fixed strip (702), and gyro wheel (703) are installed to the outer wall of axis of rotation, and collecting box (8) are installed at the top of gyro wheel (703).

8. The universal testing machine for mechanical properties of materials with safety protection function as claimed in claim 7, wherein: the second filter screen (801) is installed on the outer wall of the collection box (8), the dust removal pipe is installed on the outer wall of the collection box (8), one end of the dust removal pipe extends out of the outer wall of the bottom box (1), and the telescopic pipe (802) is installed at one end of the dust removal pipe.