CN111282702A

CN111282702A - Broken dust collector of abandonment brick and tile

Info

Publication number: CN111282702A
Application number: CN202010225841.8A
Authority: CN
Inventors: 张洁
Original assignee: Shengzhou Yunduan Environmental Protection Technology Co ltd
Current assignee: Shengzhou Yunduan Environmental Protection Technology Co ltd
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-06-16

Abstract

The invention discloses a waste brick and tile crushing and dust removing device, wherein a pressure mechanism is arranged in a machine body, a crushing mechanism is arranged at the lower end of the pressure mechanism, the pressure mechanism comprises a meshing cavity which is positioned at the upper end inside the machine body, a fixed block is fixed on the end wall in the meshing cavity, a spring groove with a leftward opening is arranged in the fixed block, a connecting block is arranged in the spring groove in a sliding manner, first springs are symmetrically fixed on the upper part and the lower part of the connecting block, the outer side of each first spring is fixed on the upper end wall and the lower end wall of the spring groove, a downwardly extending rack is fixed at the left end of the connecting block, a second spring is fixed at the upper end of the rack, the device is also provided with a replaceable box body, so that the space is saved, a large amount of dust can be generated during crushing, the dust can be.

Description

Broken dust collector of abandonment brick and tile

Technical Field

The invention relates to the technical field related to building construction, in particular to a waste brick and tile crushing and dust removing device.

Background

The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object in a specified place, and comprises foundation engineering construction, main structure construction, roofing engineering construction, decoration engineering construction and the like. The place of construction operation is called "construction job site" or "job site", also called the building site, can produce more abandonment brick often when carrying out the construction, generally pile up together abandonment brick at present, so occupation of land space is great, thereby can reduce constructor's home range, be unfavorable for the construction, traditional machine is broken to abandonment brick, can reduce the area of abandonment brick, can increase constructor's home range but use convenient inadequately, and can produce a lot of dust, influence the workman healthy.

Disclosure of Invention

Aiming at the technical defects, the invention provides a waste brick and tile crushing and dust removing device which can overcome the defects.

The invention relates to a waste brick and tile crushing and dust removing device, which comprises a machine body, wherein a pressure mechanism is arranged in the machine body, a crushing mechanism is arranged at the lower end of the pressure mechanism, the pressure mechanism comprises a meshing cavity positioned at the upper end inside the machine body, a fixed block is fixed at the end wall inside the meshing cavity, a spring groove with a leftward opening is arranged in the fixed block, a connecting block is arranged in the spring groove in a sliding manner, first springs are symmetrically fixed at the upper part and the lower part of the connecting block, the outer side of each first spring is fixed on the upper end wall and the lower end wall of the spring groove, a downwardly extending rack is fixed at the left end of the connecting block, a second spring is fixed at the upper end of the rack, the upper end of the second spring is fixed on the upper end wall of the meshing cavity, the left end of the rack can be meshed with a part of a gear, the driving shaft extends forwards into the meshing cavity and is fixedly connected with the partial gear, the driving shaft extends backwards into the driving cavity and is fixedly provided with a first belt pulley, the right end of the crushing mechanism is provided with an absorption mechanism, and the lower end of the absorption mechanism is provided with a travelling mechanism.

Preferably, the crushing mechanism comprises a crushing cavity located at the lower end of the meshing cavity, the left end of the crushing cavity is communicated with an inlet opening with an opening communicated with the outside of the machine body leftwards, the inlet opening is communicated with the outside of the machine body and is fixedly provided with an inlet cover, the left end wall of the crushing cavity where the crushing cavity is communicated with the inlet opening is obliquely and fixedly provided with a guide plate, a rack extends downwards into the crushing cavity and is fixedly provided with a pressure block, the lower end of the pressure block is fixedly provided with pressure teeth, the lower end of the pressure teeth is bilaterally and symmetrically provided with rollers, the rollers are all annularly and fixedly provided with mutually meshed crushing teeth, the rear end of the crushing cavity is provided with a rotating cavity, the rotating cavity and the crushing cavity are symmetrically and rotatably provided with a front-rear extending driven shaft, the driven shaft extends forwards into the crushing cavity and is fixedly connected with the circular cavity, and the driven shaft extends backwards into, the gear rear end is equipped with to be fixed second belt pulley on the driven shaft, the left side the second belt pulley with first belt pulley connects through first belt power, the drive chamber with it supplies to rotate to be equipped with between the chamber first recess that first belt passed, broken chamber lower extreme intercommunication has the opening UNICOM forward the outside chamber that drops of organism, it has the box to drop intracavity sliding fit, be equipped with the opening in the box and upwards communicate the collecting vat in chamber that drops, the meshing chamber right-hand member is equipped with the opening and upwards communicates the outside open slot of organism, be equipped with the box that is used for changing in the open slot.

Preferably, the absorption mechanism comprises an elliptical cavity at the right end of the crushing cavity, a disc is arranged in the elliptical cavity, six limit blocks are annularly fixed on the disc, a sliding groove with an outward opening is arranged in each limit block, a third spring is fixed on the inner end wall of the sliding groove, a sliding plate extending out of the sliding groove and abutting against the elliptical end wall of the elliptical cavity is fixed at the outer end of the third spring, a cover body extending into the crushing cavity is fixed and communicated at the left end of the elliptical cavity, a power cavity is arranged at the rear end of the elliptical cavity, a main shaft extending back and forth is rotatably arranged between the power cavity and the elliptical cavity, the main shaft extends forwards into the elliptical cavity and is fixedly connected with the disc, a third belt pulley is fixedly arranged in the power cavity, and a first bevel gear fixed on the main shaft is arranged at the rear end of the third belt pulley, a second bevel gear is meshed at the lower end of the first bevel gear, the upper end of the elliptical cavity is communicated with a circular cavity, a rotating shaft which extends forwards and backwards is rotatably arranged between the circular cavity and the power cavity, the rotating shaft extends backwards into the power cavity and is fixedly provided with a fourth belt pulley, the rear end of the fourth belt pulley is provided with a fifth belt pulley fixed on the rotating shaft, the fifth belt pulley is in power connection with the second belt pulley on the right side through a second belt, a second groove for the second belt to pass through is arranged between the power cavity and the rotating cavity, the fifth belt pulley is in power connection with the third belt pulley through a third belt, the rear end of the fourth belt pulley is provided with a motor which is fixed on the rear end wall of the power cavity and is in power connection with the rotating shaft, the rotating shaft extends forwards into the circular cavity and is annularly and is fixedly provided with six fan blades, the lower end of the elliptical cavity is communicated with a storage tank.

Preferably, the traveling mechanism comprises a driven cavity located at the lower end of the power cavity, a vertically extending rotating shaft is rotatably installed between the driven cavity and the power cavity, the rotating shaft extends upwards into the rotating shaft and is fixedly connected with the second bevel gear, the rotating shaft extends downwards into the driven cavity and is fixedly provided with a first electromagnet in an annular manner, the lower end of the first electromagnet is fixedly provided with four fourth springs in an annular manner, the lower ends of the fourth springs are fixed on a second electromagnet, the second electromagnet is fixed on a third bevel gear in an annular manner, the third bevel gear is in spline fit with the rotating shaft, the rotating shaft is provided with a spline groove for the spline fit of the third bevel gear, a traveling shaft extending forwards and backwards into the machine body is rotatably installed in the driven cavity, and traveling wheels are symmetrically fixed at the front end and the rear end of the traveling shaft, the walking shaft is located in the driven cavity and is fixedly provided with a fourth bevel gear capable of being meshed with the third bevel gear, the front portion and the rear portion of the left portion of the lower end of the machine body are symmetrically and rotatably provided with rotary tables, limiting plates extending out of the lower end of the machine body are symmetrically and fixedly arranged on the front portion and the rear portion of the lower end of each rotary table, driven rods are rotatably arranged between the limiting plates, and wheels are fixed on the driven rods.

The beneficial effects are that: the waste brick and tile crushing device is simple in structure, waste bricks and tiles are placed into the waste brick and tile crushing device to be crushed during work, waste gas brick and tile accumulation is reduced, the effect of recycling is achieved, the waste brick and tile crushing device achieves two purposes, the crushing speed is accelerated through the upper end pressure and the left and right pressures during crushing, the walking mechanism is arranged, the energy loss of workers is reduced, the device is further provided with the box body capable of being replaced, space is saved, a large amount of dust is generated during crushing, the dust is sucked away through the rotation and pressurization of the fan, the dust cannot be discharged out of the device, and therefore the heat supply health is protected.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a waste tile crushing and dust removing device of the present invention;

FIG. 2 is a schematic structural view taken at A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram at B-B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram at C-C in FIG. 1 according to an embodiment of the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-4, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to a waste brick and tile crushing and dust removing device, which comprises a machine body 10, wherein a pressure mechanism is arranged in the machine body 10, a crushing mechanism is arranged at the lower end of the pressure mechanism, the pressure mechanism comprises a meshing cavity 11 positioned at the upper end inside the machine body 10, a fixed block 15 is fixed on the end wall inside the meshing cavity 11, a spring groove 17 with a leftward opening is arranged in the fixed block 15, a connecting block 19 is arranged in the spring groove 17 in a sliding manner, first springs 16 are symmetrically fixed on the upper end and the lower end of the connecting block 19, the outer sides of the first springs 16 are fixed on the upper end wall and the lower end wall of the spring groove 17, a rack 14 extending downwards is fixed at the left end of the connecting block 19, a second spring 13 is fixed at the upper end of the rack 14, the upper end of the second spring 13 is fixed on the upper end wall of the meshing cavity 11, a part of a gear 12, the driving shaft 40 which extends forwards and backwards is rotatably arranged between the driving cavity 41 and the meshing cavity 11, the driving shaft 40 extends forwards into the meshing cavity 11 and is fixedly connected with the partial gear 12, the driving shaft 40 extends backwards into the driving cavity 41 and is fixedly provided with a first belt pulley 42, the right end of the crushing mechanism is provided with an absorption mechanism, and the lower end of the absorption mechanism is provided with a travelling mechanism.

Advantageously, the crushing mechanism comprises a crushing cavity 31 at the lower end of the meshing cavity 11, the left end of the crushing cavity 31 is communicated with an inlet 38 which is opened and communicated with the outside of the machine body 10 to the left, the inlet 38 is communicated with the outside of the machine body 10 and is fixedly provided with an inlet cover 39, the left end wall of the crushing cavity 31 where the crushing cavity 31 is communicated with the inlet 38 is obliquely and fixedly provided with a guide plate 37, the rack 14 extends downwards into the crushing cavity 31 and is fixedly provided with a pressure block 36, the lower end of the pressure block 36 is fixedly provided with a pressure tooth 35, the lower end of the pressure tooth 35 is symmetrically and leftwards provided with a roller 30, the roller 30 is annularly and fixedly provided with mutually meshed crushing teeth 52, the rear end of the crushing cavity 31 is provided with a rotating cavity 45, a front-back extending driven shaft 51 is symmetrically and leftwards and rotatablely arranged between the rotating cavity 45 and the crushing cavity 31, the driven shaft 51 extends forwards into the crushing, driven shaft 51 ranging back to rotate in the chamber 45 and fixed mounting have intermeshing's gear 50, gear 50 rear end is equipped with to be fixed second belt pulley 44 on driven shaft 51, the left side second belt pulley 44 with first belt pulley 42 is through first belt 43 power connection, drive chamber 41 with it supplies to rotate to be equipped with between the chamber 45 the first recess that first belt 43 passed, broken chamber 31 lower extreme intercommunication has the opening UNICOM that gos forward the outside chamber 34 that drops of organism 10, it has box 33 to drop intracavity 34 sliding fit, it upwards communicates to be equipped with the opening in the box 33 the collecting vat 32 in chamber 34 drops, meshing chamber 11 right-hand member is equipped with the opening and upwards communicates the outside open slot 18 of organism 10, be equipped with the box 33 that is used for the change in the open slot 18.

Beneficially, the absorption mechanism includes an oval cavity 24 at the right end of the crushing cavity 31, a disc 69 is arranged in the oval cavity 24, six limit blocks 70 are annularly fixed on the disc 69, a sliding groove 25 with an outward opening is arranged in each limit block 70, a third spring 68 is fixed on an inner end wall of the sliding groove 25, a sliding plate 23 extending out of the sliding groove 25 and abutting against an oval end wall of the oval cavity 24 is fixed on an outer end of the third spring 68, a cover 29 extending into the crushing cavity 31 is fixed and communicated with a left end of the oval cavity 24, a power cavity 53 is arranged at a rear end of the oval cavity 24, a main shaft 71 extending back and forth is rotatably mounted between the power cavity 53 and the oval cavity 24, the main shaft 71 extends forward into the oval cavity 24 and is fixedly connected with the disc 69, the disc 69 extends backward into the power cavity 53 and is fixedly mounted with a third belt pulley 67, the rear end of the third belt pulley 67 is provided with a first bevel gear 57 fixed on the main shaft 71, the lower end of the first bevel gear 57 is engaged with a second bevel gear 58, the upper end of the elliptical cavity 24 is communicated with the circular cavity 20, a rotating shaft 22 extending forwards and backwards is rotatably arranged between the circular cavity 20 and the power cavity 53, the rotating shaft 22 extends backwards into the power cavity 53 and is fixedly provided with a fourth belt pulley 55, the rear end of the fourth belt pulley 55 is provided with a fifth belt pulley 73 fixed on the rotating shaft 22, the fifth belt pulley 73 is in power connection with the right side second belt pulley 44 through a second belt 72, a second groove for the second belt 72 to pass through is arranged between the power cavity 53 and the rotating cavity 45, the fifth belt pulley 73 is in power connection with the third belt pulley 67 through a third belt 56, the rear end of the fourth belt pulley 55 is provided with an electric device fixed on the rear end wall of the power cavity 53 and in power connection with the rotating shaft 22 And the rotating shaft 22 extends forwards into the circular cavity 20 and is fixed with six fan blades 21 in an annular mode, and the lower end of the elliptical cavity 24 is communicated with a storage groove 26.

Advantageously, the traveling mechanism comprises a driven cavity 64 located at the lower end of the power cavity 53, a rotating shaft 59 extending up and down is rotatably installed between the driven cavity 64 and the power cavity 53, the rotating shaft 59 extends up into the rotating shaft 59 and is fixedly connected with the second bevel gear 58, the rotating shaft 59 extends down into the driven cavity 64 and is fixedly installed with a first electromagnet 60 in an annular manner, four fourth springs 61 are fixed to the lower end of the first electromagnet 60 in an annular manner, the lower ends of the fourth springs 61 are all fixed to a second electromagnet 62, the second electromagnet 62 is fixed to a third bevel gear 65 in an annular manner, the third bevel gear 65 is in spline fit with the rotating shaft 59, a spline groove 63 for spline fit of the third bevel gear 65 is arranged on the rotating shaft 59, and a traveling shaft 27 extending out of the machine body 10 from front to back is rotatably installed in the driven cavity 64, the front end and the rear end of the walking shaft 27 are symmetrically fixed with walking wheels 28, the walking shaft 27 is located in the driven cavity 64 and is fixed with a fourth bevel gear 66 which can be meshed with the third bevel gear 65, the front part and the rear part of the left part of the lower end of the machine body 10 are symmetrically and rotatably provided with rotary discs 49, the lower ends of the rotary discs 49 are symmetrically and longitudinally fixed with limiting plates 48 extending out of the lower end of the machine body 10, driven rods 47 are rotatably arranged between the limiting plates 48, and wheels 46 are fixed on the driven rods 47.

In the initial state, the first electromagnet 60 and the second electromagnet 62 repel each other, the fourth spring 61 is uncompressed, the third bevel gear 65 engages the fourth bevel gear 66, the first spring 16 is uncompressed or stretched, the partial gear 12 is not engaged with the rack 14, and the second spring 13 is not stretched;

when the operation is started, waste bricks and tiles are put into the inlet cover 39, the motor 54 is started, the rotating shaft 22 drives the fourth belt pulley 55 to rotate, the fourth belt pulley 55 drives the third belt pulley 67 to rotate through the third belt 56, the main shaft 71 drives the first bevel gear 57 to rotate, the second bevel gear 58 drives the rotating shaft 59 to rotate, the third bevel gear 65 drives the fourth bevel gear 66 to rotate, the walking shaft 27 drives the walking wheels 28 to rotate, the device walks, when the operation needs to be stopped, the first electromagnet 60 attracts the second electromagnet 62 and the fourth spring 61 to compress, the third bevel gear 65 is separated from the fourth bevel gear 66, because the rotating shaft 22 rotates, the fifth belt pulley 73 drives the second belt pulley 44 on the right side to rotate through the second belt 72, the driven shaft 51 on the right side drives the gear 50 to be in meshed transmission, the roller 30 drives the crushing teeth 52 to mutually rotate and because the second belt pulley 44 on the left side rotates, the left second belt pulley 44 drives the first belt pulley 42 to rotate through the first belt 43, the driving shaft 40 drives part of the gear 12 to engage with the rack 14, thereby the rack 14 moves downwards, the connecting block 19 moves downwards to stretch the upper first spring 16, the lower first spring 16 is compressed, the second spring 13 stretches, so that the pressure block 36 drives the pressure teeth 35 to crush the waste tiles in a matching way, when part of the gear 12 is separated from the rack 14, the first spring 16 resets to drive the rack 14 to move upwards, the second spring 13 resets, the crushed waste tiles enter the collecting groove 32, the box body 33 needs to be replaced to pull the box body 33, so that the open groove 18 is taken out and a new one is put in, because the rotating shaft 22 rotates, the fan blades 21 rotate to form wind power, the disc 69 is driven by the main shaft 71 to rotate, pressure is generated through the matching of the sliding plate 23 and the end wall of the oval cavity 24, the wind power is increased, and dust enters the storage tank 26 to be collected.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a broken dust collector of abandonment brick and tile, includes the organism, its characterized in that: a pressure mechanism is arranged in the machine body, a crushing mechanism is arranged at the lower end of the pressure mechanism, the pressure mechanism comprises a meshing cavity which is positioned at the upper end inside the machine body, a fixed block is fixed on the end wall inside the meshing cavity, a spring groove with a leftward opening is arranged in the fixed block, a connecting block is slidably mounted in the spring groove, first springs are symmetrically fixed on the connecting block from top to bottom, the outer side of each first spring is fixed on the upper end wall and the lower end wall of the spring groove, a downwardly extending rack is fixed at the left end of the connecting block, a second spring is fixed at the upper end of the rack, the upper end of the second spring is fixed on the upper end wall of the meshing cavity, a partial gear can be meshed at the left end of the rack, a driving cavity is arranged at the rear end of the meshing cavity, a driving shaft which extends forwards and backwards is rotatably arranged between the driving cavity, the driving shaft extends to the rear of the driving shaft, a first belt pulley is fixedly arranged in the driving cavity, an absorption mechanism is arranged at the right end of the crushing mechanism, and a walking mechanism is arranged at the lower end of the absorption mechanism.

2. The broken dust collector of abandonment brick and tile of claim 1, characterized by: the crushing mechanism comprises a crushing cavity positioned at the lower end of the meshing cavity, the left end of the crushing cavity is communicated with an inlet opening with an opening communicated with the outside of the machine body leftwards, the inlet opening is communicated with the outside of the machine body and is fixedly provided with an inlet cover, the left end wall of the crushing cavity where the crushing cavity is communicated with the inlet opening is obliquely and fixedly provided with a guide plate, a rack extends downwards into the crushing cavity and is fixedly provided with a pressure block, the lower end of the pressure block is fixedly provided with pressure teeth, the lower end of the pressure teeth is bilaterally and symmetrically provided with rollers, mutually meshed crushing teeth are fixed on the rollers in an annular manner, the rear end of the crushing cavity is provided with a rotating cavity, a driven shaft extending forwards and backwards is arranged between the rotating cavity and the crushing cavity in a bilaterally and symmetrically rotating mode, the driven shaft extends forwards into the crushing cavity and is fixedly connected with the circular cavity, the gear rear end is equipped with to be fixed second belt pulley on the driven shaft, the left side the second belt pulley with first belt pulley connects through first belt power, the drive chamber with it supplies to rotate to be equipped with between the chamber first recess that first belt passed, broken chamber lower extreme intercommunication has the opening UNICOM forward the outside chamber that drops of organism, it has the box to drop intracavity sliding fit, be equipped with the opening in the box and upwards communicate the collecting vat in chamber that drops, the meshing chamber right-hand member is equipped with the opening and upwards communicates the outside open slot of organism, be equipped with the box that is used for changing in the open slot.

3. The broken dust collector of abandonment brick and tile of claim 2, characterized in that: the absorption mechanism comprises an oval cavity positioned at the right end of the crushing cavity, a disc is arranged in the oval cavity, six limit blocks are annularly fixed on the disc, a sliding groove with an outward opening is formed in each limit block, a third spring is fixed on the inner end wall of the sliding groove, a sliding plate extending out of the sliding groove and abutting against the oval end wall of the oval cavity is fixed at the outer end of the third spring, the left end of the oval cavity is fixed and communicated with a cover body extending into the crushing cavity, a power cavity is arranged at the rear end of the oval cavity, a main shaft extending back and forth is rotatably arranged between the power cavity and the oval cavity, the main shaft extends forwards into the oval cavity and is fixedly connected with the disc, the disc extends backwards into the power cavity and is fixedly provided with a third belt pulley, and a first bevel gear fixed on the main shaft is arranged at the rear end of the third belt pulley, a second bevel gear is meshed at the lower end of the first bevel gear, the upper end of the elliptical cavity is communicated with a circular cavity, a rotating shaft which extends forwards and backwards is rotatably arranged between the circular cavity and the power cavity, the rotating shaft extends backwards into the power cavity and is fixedly provided with a fourth belt pulley, the rear end of the fourth belt pulley is provided with a fifth belt pulley fixed on the rotating shaft, the fifth belt pulley is in power connection with the second belt pulley on the right side through a second belt, a second groove for the second belt to pass through is arranged between the power cavity and the rotating cavity, the fifth belt pulley is in power connection with the third belt pulley through a third belt, the rear end of the fourth belt pulley is provided with a motor which is fixed on the rear end wall of the power cavity and is in power connection with the rotating shaft, the rotating shaft extends forwards into the circular cavity and is annularly and is fixedly provided with six fan blades, the lower end of the elliptical cavity is communicated with a storage tank.

4. The broken dust collector of abandonment brick and tile of claim 3, characterized by: the traveling mechanism comprises a driven cavity positioned at the lower end of the power cavity, a rotating shaft which extends up and down is rotatably arranged between the driven cavity and the power cavity, the rotating shaft extends upwards into the rotating shaft and is fixedly connected with the second bevel gear, the rotating shaft extends downwards into the driven cavity and is fixedly provided with a first electromagnet in an annular manner, the lower end of the first electromagnet is fixedly provided with four fourth springs in an annular manner, the lower ends of the fourth springs are fixed on the second electromagnet, the second electromagnet is fixedly arranged on a third bevel gear in an annular manner, the third bevel gear is in spline fit with the rotating shaft, the rotating shaft is provided with a spline groove for the spline fit of the third bevel gear, a traveling shaft which extends out of the machine body from front to back is rotatably arranged in the driven cavity, traveling wheels are symmetrically fixed at the front and back tail ends of the traveling shaft, and a fourth bevel gear which can be meshed with the third bevel gear is fixed in the driven cavity, the rotary table is symmetrically and rotatably mounted on the front and back of the left portion of the lower end of the machine body, limiting plates extending out of the lower end of the machine body are symmetrically and fixedly arranged on the front and back of the lower end of the rotary table, driven rods are rotatably mounted between the limiting plates, and wheels are fixedly arranged on the driven rods.