CN114918034A

CN114918034A - Aluminum scrap and sand scrap wet-type sorting and collecting device

Info

Publication number: CN114918034A
Application number: CN202210618976.XA
Authority: CN
Inventors: 陈胜迁; 王波; 孙甲尧; 陈立; 宋斌
Original assignee: Zhangjiajie Institute of Aeronautical Engineering
Current assignee: Zhangjiajie Institute of Aeronautical Engineering
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-08-19
Anticipated expiration: 2042-06-02
Also published as: CN114918034B

Abstract

The invention relates to the technical field of aluminum sand sorting, in particular to a wet sorting and collecting device for waste aluminum and waste sand, which comprises a chassis and a casing, wherein the chassis is fixedly penetrated through the upper surface of the casing, a motor and a cylinder are respectively and fixedly connected with the surface of the chassis and one side of the casing, a screen is arranged on the side wall of a rib frame, the bottom end of the frame is fixedly connected with an enclosing plate, a gap is reserved between the bottom end of the screen and the bottom end of the enclosing plate and is a notch, a blanking disc is movably arranged in the notch, the screen assembly drives the blanking disc to move up and down along the notch, and a chute is arranged at the bottom end in the casing and below the blanking disc. The method avoids the waste sand from being stuck on the surface of the aluminum block to influence the screening, and reduces the investment of manpower and material resources.

Description

Aluminum scrap and sand scrap wet-type sorting and collecting device

Technical Field

The invention relates to the technical field of aluminum sand sorting, in particular to a wet sorting and collecting device for waste aluminum and waste sand.

Background

Aluminium is a silver white light metal, and is malleable, because its active chemistry all has extensive application in each field, in the workshop, aluminium processing man-hour, can produce unnecessary leftover bits and pieces and mix together along with other processing waste sand and concentrate the clearance together, for the production profit maximize, workshop personnel can mix these production waste materials together and screen out waste aluminium leftover bits and pieces again, carry out recycle

Present workshop is screened aluminium scrap and useless sand has two kinds of modes, dry separation and wet selection, dry separation is though efficiency is higher, but the selection by winnowing effect of useless sand is unsatisfactory, the mode that adopts wet selection for this reason workshop mostly is to its selection by winnowing, but present wet separation device is collected the mode that useless sand passes through rivers, nevertheless useless sand contact water can become the adhesion piece and attach on the aluminium pig, cause the difficulty of selecting separately, thereby lead to the effect that equipment was selected separately unsatisfactory, equipment screening efficiency is low.

Disclosure of Invention

The invention provides a waste aluminum and waste sand wet type sorting and collecting device, which aims at the defects that the existing workshop is high in waste aluminum and waste sand screening, dry sorting and wet sorting are adopted, the dry sorting efficiency is high, but the winnowing effect of the waste sand is unsatisfactory, the workshop is mostly winnowed by adopting a wet sorting mode, but the existing wet sorting device collects the waste sand in a water flow mode, but the waste sand is contacted with water and can be formed into sticky blocks to be attached to an aluminum block, so that the sorting difficulty is caused, the sorting effect of equipment is unsatisfactory, and the screening efficiency of the equipment is low.

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

a wet type sorting and collecting device for aluminum scrap and sand scrap comprises a chassis and a casing, wherein the chassis is fixedly penetrated on the upper surface of the casing, a motor and a cylinder are respectively and fixedly connected on the surface of the chassis and positioned on one side of the casing, a driving shaft is rotatably connected at the center of the lower end of the chassis, the bottom end of the driving shaft extends to the lower part of the casing, the end part of an output shaft of the motor is fixedly connected with a rotating wheel, a belt is connected between the two rotating wheels, the driving shaft extends into the end part of the casing and is connected with a sliding rod in a sliding way, the end part of the sliding rod is fixedly connected with a frame, an eccentric shaft assembly is arranged in the frame, a rib frame is fixedly connected on the upper surface of the frame, a screen is arranged on the side wall of the rib frame, a coaming is fixedly connected with the bottom end of the frame, gaps are left between the bottom end of the screen and the bottom end of the coaming are gaps, a blanking disc is movably arranged in the gaps, and the end part of a piston rod of the cylinder is connected with a screen assembly, the screen assembly drives the blanking disc to move up and down along the notch, and the chute is formed in the bottom end inside the casing and located below the blanking disc.

Preferably, the inner wall of the chassis is fixedly connected with a collecting box below the casing, the casing is far away from the side wall of the motor and is fixedly connected with a conveying pipe, and a feed opening of the conveying pipe is arranged above the collecting box.

Preferably, the eccentric shaft assembly comprises a stirring shaft and a rotating shaft, the bottom end of the rotating shaft is rotatably connected to the center of the lower end in the frame, the top end of the rotating shaft is fixedly connected with a sleeve, and the stirring shaft is arranged above the sleeve.

Preferably, the sleeve upper surface is provided with a sliding chute, the inner wall of the sleeve is connected with a sliding plate in a sliding mode, the inner end of the sliding plate and the inner wall of the sleeve are connected with a second spring, one end of the upper surface of the sliding plate is fixedly connected with a fixed shaft, and the sliding chute is connected with the fixed shaft in a sliding mode.

Preferably, the fixed shaft top end is fixedly connected with the stirring shaft, the stirring shaft is hollow, the inner wall of one side of the stirring shaft is fixedly connected with the weighting rod, and the left side and the right side of the weighting rod are respectively fixedly connected with the stirring rods and the sweeping plate.

As preferred, screen cloth subassembly includes connecting rod, lower charging tray, the connecting rod end extends to the solid fixed ring of fixedly connected with in the casing, gu fixed ring upper surface fixedly connected with down the charging tray, the draw-in groove has been seted up in the bounding wall lower surface outside, the charging tray mutually supports with the draw-in groove down.

Preferably, the bottom end in the casing is fixedly connected with an annular guide rail, a plurality of bottom rods are slidably connected in the annular guide rail, and the top end of each bottom rod is fixedly connected to the lower end of the frame.

Preferably, the bottom rod comprises a first connecting rod, a first spring and a second connecting rod, the first connecting rod is fixedly connected to the lower surface of the frame, the second connecting rod is connected to the inner wall of the annular guide rail in a sliding mode, and the first spring is connected between each first connecting rod and each second connecting rod which are opposite to each other.

Preferably, movable sleeve plates are arranged on the side edge of the shell and above and below the joint of the side edge of the shell and the connecting rod, and each movable sleeve plate is connected with a baffle in a sliding manner.

Preferably, in: each baffle passes through buckle and connecting rod fixed connection, connecting rod upper surface fixed connection has branch, branch sliding connection is on the chassis.

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

1. the water flow carries the waste sand to flow out of the frame under the action of centrifugal force, then the waste sand contacts the screen, the waste sand and the waste aluminum float in the shell due to the water flow, the stirring shaft has a difference in rotating speed from the frame under the resistance of water, the waste sand and the waste aluminum under the action of a force to drive the stirring shaft to extend forwards along the direction of the chute during the rotation of the frame, the stirring shaft has a difference in rotating speed from the frame due to the water flow, so that the waste sand and the waste aluminum in the frame are beaten, the aluminum blocks stuck together by the waste sand can be separated through the design that the stirring shaft is similar to an eagle claw, then the sweeping plate continues to beat the aluminum blocks to impact the edges of the frame, sand particles stuck on the waste sand are knocked off, the screening effect is improved, the problem that the waste sand is stuck on the surfaces of the aluminum blocks to influence the screening is avoided, the investment of manpower and material resources is reduced.

2. After having screened a batch waste sand and aluminium scrap, drive the unloading dish downstream through the cylinder, flow into the bottom to the casing from the breach through rivers with waste sand, flow into the collecting box with the equipment through the conveying pipeline in, then with unloading dish rebound, behind the chucking draw-in groove, with frame and screen cloth rebound, then with unloading dish rebound rapidly, frame and screen cloth are under the effect of first spring, vibrate from top to bottom, thereby will be stained with glutinous piece of waste sand on filter screen and frame and shake down, thereby make things convenient for subsequent sorting, the maintenance of later stage equipment has been reduced.

Drawings

FIG. 1 is a schematic structural diagram of an entire wet sorting and collecting apparatus for aluminum scrap and sand scrap according to the present invention;

FIG. 2 is a schematic structural diagram of a frame of a wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 3 is a schematic structural diagram of a screen of a wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 4 is a schematic structural diagram of a cylinder of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 5 is a schematic structural view of a bottom rod of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 6 is an enlarged schematic structural view of the part A in FIG. 4 of the wet sorting and collecting device for aluminum scrap and sand of the present invention;

FIG. 7 is a schematic structural view of a bottom rod of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 8 is a schematic structural view of an eccentric shaft assembly of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 9 is an enlarged schematic structural view of the part B in FIG. 8 of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

FIG. 10 is a schematic structural view of a housing of the wet sorting and collecting device for aluminum scrap and sand scrap according to the present invention;

fig. 11 is an enlarged schematic structural view of a part C in fig. 10 of the wet sorting and collecting device for aluminum scrap and waste sand according to the present invention.

In the figure: 1. a housing; 2. a chassis; 3. a screen assembly; 301. a connecting rod; 302. a strut; 303. discharging a material tray; 304. a baffle plate; 305. enclosing plates; 306. a card slot; 307. a bottom bar; 3071. a first link; 3072. a first spring; 3073. a second link; 308. an annular guide rail; 309. a notch; 310. a fixing ring; 311. a movable sleeve plate; 312. buckling; 4. a cylinder; 5. a drive shaft; 6. a delivery pipe; 7. a motor; 8. a belt; 9. an eccentric shaft assembly; 901. a stirring shaft; 902. a sleeve; 903. a fixed shaft; 904. a slide plate; 905. a chute; 906. a second spring; 907. a rotating shaft; 908. sweeping the board; 909. a stirring rod; 910. a weight bar; 10. a collection box; 11. a frame; 12. a rotating wheel; 13. screening a screen; 14. a rib frame; 15. a chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Examples

As shown in fig. 1 to 11, a wet sorting and collecting device for aluminum scrap and sand scrap comprises a chassis 2 and a casing 1, wherein the chassis 2 is fixedly penetrated through the upper surface of the casing 1, a motor 7 and a cylinder 4 are respectively and fixedly connected to the surface of the chassis 2 and positioned on one side of the casing 1, a driving shaft 5 is rotatably connected to the center of the lower end of the chassis 2, a rotating wheel 12 is fixedly connected to the bottom end of the driving shaft 5 extending to the lower side of the casing 1, a rotating wheel 12 is fixedly connected to the end of an output shaft of the motor 7, a belt 8 is connected between the two rotating wheels 12, a sliding rod is slidably connected to the end of the driving shaft 5 extending into the casing 1, a frame 11 is fixedly connected to the end of the sliding rod, an eccentric shaft assembly 9 is arranged in the frame 11, a rib frame 14 is fixedly connected to the upper surface of the frame 11, a screen 13 is arranged on the side wall of the rib frame 14, a surrounding plate 305 is fixedly connected to the bottom end of the frame 11, a gap is left between the bottom end of the screen 13 and the surrounding plate 305 as a gap 309, a blanking disc 303 is movably arranged in the gap 309, the end of the piston rod of the cylinder 4 is connected with a screen assembly 3, the screen assembly 3 drives the lower tray 303 to move up and down along the notch 309, and the bottom inside the casing 1 is located below the lower tray 303 and is provided with a chute 15.

In this embodiment, 2 inner walls on chassis just are located 1 below fixedly connected with collecting box 10 of casing, 7 lateral wall fixedly connected with conveying pipeline 6 of motor are kept away from to

casing

1, 6 feed openings of conveying pipeline set up in collecting box 10 top, pour waste sand and waste aluminium into to frame 11 in, and hang the water pipe in the equipment top, carry out the water source that provides that lasts, frame 11 is equipped with the hole all around, be less than the size of aluminium pig, thereby select separately, starter motor 7 drives frame 11 at 1 inside rotation of casing, rivers are taken waste sand outside frame 11 of outflow under the effect of centrifugal force, then contact screen cloth 13, collect through screen cloth 11, and at the rotatory in-process of frame 11.

In this embodiment, the eccentric shaft assembly 9 includes a stirring shaft 901, a rotating shaft 907, a bottom end of the rotating shaft 907 is rotatably connected to a center of an inner lower end of the frame 11, a sleeve 902 is fixedly connected to a top end of the rotating shaft 907, a stirring shaft 901 is disposed above the sleeve 902, a weighting rod 910 is disposed to act on a force to drive the stirring shaft 901 to extend forward along a direction of the sliding chute 905, due to a factor of water flow, waste sand and waste aluminum float inside the housing 1, the stirring shaft 901 is under resistance of water and the waste sand and the waste aluminum, a rotating speed is different from that of the frame 11, and thus the waste sand and the waste aluminum inside the frame 11 are flapped.

In this embodiment, sleeve 902 upper surface is provided with spout 905, sleeve 902 inner wall sliding connection has slide 904, slide 904 inner and sleeve 902 inner wall connection have second spring 906, slide 904 upper surface one end fixedly connected with fixed axle 903, spout 905 sliding connection has fixed axle 903, design through the similar hawk claw of puddler 909, can part the aluminium pig through the adhesion of waste sand together, sweep board 908 afterwards and continue to pat the aluminium pig, strike the aluminium pig to frame 11 edge, thereby to be stained with the grains of sand of gluing on waste sand and collide with and drop, make the screening effect obtain improving, avoided waste sand to be stained with and glue on the aluminium pig surface, influence the screening, the input of manpower and material resources has been reduced.

In this embodiment, two fixed axles 903 top fixedly connected with (mixing) shaft 901, the inside cavity of (mixing) shaft 901 and one side inner wall fixedly connected with weight rod 910, weight rod 910 left and right sides respectively fixedly connected with a plurality of puddler 909 and sweep board 908, after having filtered a batch of useless sand and useless aluminium, drive down charging tray 303 through cylinder 4 and move down, flow into the bottom of casing 1 from breach 309 with useless sand through rivers, flow into the collecting box 10 with the equipment through conveying pipeline 6 in, then will descend charging tray 303 to move up, behind chucking draw-in groove 306.

In this embodiment, screen cloth subassembly 3 includes connecting rod 301, lower charging tray 303, and connecting rod 301 rod end extends to the interior solid fixed ring 310 of fixedly connected with of casing 1, and gu fixed surface is connected with lower charging tray 303 on the solid fixed ring 310, and draw-in groove 306 has been seted up to bounding wall 305 lower surface outside, and lower charging tray 303 and draw-in groove 306 mutually support.

In this embodiment, the inside bottom fixedly connected with annular guide rail 308 of casing 1, sliding connection has a plurality of sill bar 307 in the annular guide rail 308, every sill bar 307 top fixed connection is at the 11 lower extremes of frame, with frame 11 and screen cloth 13 rebound, then with down quick lapse of charging tray 303, frame 11 and screen cloth 13 are under first spring 3072's effect, vibrate from top to bottom, thereby will be stained with and glue under the shake of the useless sand glutinous piece on filter screen and frame 11, thereby make things convenient for subsequent sorting, the maintenance of later stage equipment has been reduced.

In this embodiment, the bottom rod 307 includes a first link 3071, a first spring 3072 and a second link 3073, the first link 3071 is fixedly connected to the lower surface of the frame 11, the second link 3073 is slidably connected to the inner wall of the ring-shaped guide rail 308, a first spring 3072 is connected between each opposite first link 3071 and each second link 3073, waste sand and waste aluminum are poured into the frame 11, and the water pipe is suspended above the device, a continuous water supply source is provided, holes are formed around the frame 11 and smaller than the size of an aluminum block, so as to perform sorting, the starting motor 7 drives the frame 11 to rotate inside the housing 1, and water flow carries the waste sand to flow out of the frame 11 under the action of centrifugal force.

In this embodiment, movable sleeve plates 311 are disposed at the side of the housing 1 and above and below the joints with the connecting rods 301, and a baffle 304 is slidably connected to each movable sleeve plate 311.

In this embodiment, every baffle 304 passes through buckle 312 and connecting rod 301 fixed connection, fixed surface is connected with branch 302 on connecting rod 301, branch 302 sliding connection is on chassis 2, waste sand and aluminium scrap float inside casing 1, the (mixing) shaft 901 is under the resistance of water and waste sand and aluminium scrap, pivoted speed and frame 11 have the difference, thereby pat waste sand and aluminium scrap inside frame 11, design through puddler 909 similar hawk claw, can be with the aluminium pig through the waste sand adhesion together separate, sweep board 908 afterwards and continue patting the aluminium pig, strike the aluminium pig to frame 11 edge, thereby collide with the sand grain that will be stained with on waste sand and drop off, make the screening effect obtain improving, avoided waste sand to be stained with and to stick on the aluminium pig surface, influence the screening, the input of manpower and material resources has been reduced.

This collection device is selected separately to useless aluminium waste sand wet-type's theory of operation: pouring waste sand and waste aluminum into the frame 11, suspending a water pipe above the equipment, continuously providing a water source, arranging holes on the periphery of the frame 11, wherein the holes are smaller than the size of aluminum blocks, so as to perform sorting, starting the motor 7 to drive the frame 11 to rotate in the casing 1, allowing water flow to carry the waste sand out of the frame 11 under the action of centrifugal force, contacting the screen 13, collecting through the screen 11, and in the rotation process of the frame 11, when the weighting rod 910 is arranged, acting a force to drive the stirring shaft 901 to extend forwards along the direction of the chute 905, due to the factor of water flow, the waste sand and the waste aluminum float in the casing 1, the stirring shaft 901 rotates at a speed different from that of the frame 11 under the resistance of water, the waste sand and the waste aluminum, beating the waste sand and the waste aluminum in the casing 11, and separating the aluminum blocks adhered together through the adhesion of the waste sand through the design of the stirring rod 909 similar to hawk claw, sweep board 908 afterwards and continue to pat the aluminium pig, strike the aluminium pig to frame 11 edge to the grit that will be stained with and glue on the waste sand collides with and drops, makes the screening effect obtain improving, has avoided the waste sand to be stained with and glues on the aluminium pig surface, influences the screening, has reduced the input of manpower and material resources.

After having screened a batch waste sand and aluminium scrap, charging tray 303 downstream under the drive of cylinder 4, flow into the bottom of casing 1 from breach 309 with waste sand through rivers, flow into the collecting box 10 with equipment through conveying pipeline 6 in, then with charging tray 303 upstream down, behind chucking draw-in groove 306, with frame 11 and screen cloth 13 upstream down, then with charging tray 303 downstream down, frame 11 and screen cloth 13 are under first spring 3072's effect, vibrate from top to bottom, thereby will be stained with glutinous waste sand glutinous piece on filter screen and frame 11 and shake down, thereby make things convenient for subsequent sorting, the maintenance of later stage equipment has been reduced.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and obvious variations and modifications may be made within the scope of the present invention.

Claims

1. The utility model provides a collection device is selected separately to useless aluminium and useless sand wet-type, includes chassis (2) and casing (1), its characterized in that: the chassis (2) is fixedly penetrated on the upper surface of the casing (1), the surface of the chassis (2) and positioned on one side of the casing (1) are respectively and fixedly connected with a motor (7) and a cylinder (4), the center of the lower end of the chassis (2) is rotatably connected with a driving shaft (5), the bottom end of the driving shaft (5) extends to the lower part of the casing (1) and is fixedly connected with a rotating wheel (12), the end part of an output shaft of the motor (7) is fixedly connected with the rotating wheel (12), a belt (8) is connected between the two rotating wheels (12), the end part of the driving shaft (5) extending into the casing (1) is slidably connected with a sliding rod, the end part of the sliding rod is fixedly connected with a frame (11), an eccentric shaft assembly (9) is arranged in the frame (11), the upper surface of the frame (11) is fixedly connected with a rib frame (14), the side wall of the rib frame (14) is provided with a screen (13), and the bottom end of the frame (11) is fixedly connected with a coaming (305), screen cloth (13) bottom and bounding wall (305) bottom are left the space and are breach (309), breach (309) internalization is provided with down charging tray (303), cylinder (4) piston rod end connection has screen assembly (3), screen assembly (3) drive down charging tray (303) and reciprocate along breach (309), chute (15) have been seted up to casing (1) inside bottom and below being located charging tray (303).

2. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 1, wherein: chassis (2) inner wall just is located casing (1) below fixedly connected with collecting box (10), motor (7) lateral wall fixedly connected with conveying pipeline (6) are kept away from in casing (1), conveying pipeline (6) feed opening sets up in collecting box (10) top.

3. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 1, wherein: the eccentric shaft assembly (9) comprises a stirring shaft (901) and a rotating shaft (907), the bottom end of the rotating shaft (907) is rotatably connected to the center of the inner lower end of the frame (11), the top end of the rotating shaft (907) is fixedly connected with a sleeve (902), and the stirring shaft (901) is arranged above the sleeve (902).

4. The wet sorting and collecting device for the waste aluminum and sand according to claim 3, wherein: sleeve (902) upper surface is provided with spout (905), sleeve (902) inner wall sliding connection has slide (904), slide (904) the inner is connected with second spring (906) with sleeve (902) inner wall, slide (904) upper surface one end fixedly connected with fixed axle (903), spout (905) sliding connection has fixed axle (903).

5. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 4, wherein: the top ends of the two fixed shafts (903) are fixedly connected with a stirring shaft (901), the stirring shaft (901) is hollow, the inner wall of one side of the stirring shaft (901) is fixedly connected with a weighting rod (910), and the left side and the right side of the weighting rod (910) are respectively fixedly connected with a plurality of stirring rods (909) and a sweeping plate (908).

6. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 1, wherein: screen assembly (3) include connecting rod (301), unloading dish (303), connecting rod (301) rod end extends to the solid fixed ring of fixedly connected with (310) in casing (1), gu fixed ring (310) upper surface fixedly connected with down charging tray (303), draw-in groove (306) have been seted up in bounding wall (305) lower surface outside, lower charging tray (303) and draw-in groove (306) mutually support.

7. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 6, wherein: the bottom end in the machine shell (1) is fixedly connected with an annular guide rail (308), a plurality of bottom rods (307) are connected in the annular guide rail (308) in a sliding mode, and the top end of each bottom rod (307) is fixedly connected to the lower end of the frame (11).

8. The wet sorting and collecting device for aluminum scrap and sand scrap according to claim 7, wherein: the bottom rod (307) comprises a first connecting rod (3071), a first spring (3072) and a second connecting rod (3073), the first connecting rod (3071) is fixedly connected to the lower surface of the frame (11), the second connecting rod (3073) is connected to the inner wall of the annular guide rail (308) in a sliding mode, and the first spring (3072) is connected between each first connecting rod (3071) and each second connecting rod (3073) oppositely.

9. The wet sorting and collecting device for the waste aluminum and sand as claimed in claim 8, wherein: the movable sleeve plates (311) are arranged on the side edges of the machine shell (1) and above and below the joint of the side edges and the connecting rod (301), and each movable sleeve plate (311) is connected with a baffle (304) in a sliding mode.

10. The wet sorting and collecting device for aluminum scrap and sand scrap according to claim 9, wherein: each baffle (304) is fixedly connected with a connecting rod (301) through a buckle (312), a supporting rod (302) is fixedly connected to the upper surface of the connecting rod (301), and the supporting rod (302) is connected to the chassis (2) in a sliding mode.