CN218987689U

CN218987689U - Panel three-dimensional type buffering bin

Info

Publication number: CN218987689U
Application number: CN202223000488.7U
Authority: CN
Inventors: 冯庆雄; 王晓涛
Original assignee: Xiamen Pecton Technology Co ltd
Current assignee: Xiamen Pecton Technology Co ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-05-09
Anticipated expiration: 2032-11-08

Abstract

The utility model discloses a panel three-dimensional type buffer bin which comprises a frame, wherein the upper surface of the frame is provided with a buffer bin, the buffer bin comprises a bin frame, a buffer frame capable of moving up and down is arranged in the bin frame, one side of the buffer frame is provided with a lifting component for the buffer frame to move up and down, and the upper surface of the frame is also provided with a carrying device for transferring panels and an access mechanism for transferring trays with the panels. The beneficial effects of the utility model are as follows: the panel to be cached and solidified is placed on the tray positioned on the access mechanism through the handling device, the tray filled with the panel is transferred into the caching frame through the access mechanism, and when the caching frame of one layer is fully filled with the tray filled with the panel, the caching frame is only required to move up and down through the lifting assembly, so that one layer of the tray without the panel is connected with the access mechanism.

Description

Panel three-dimensional type buffering bin

Technical Field

The utility model relates to the field of panel buffering, in particular to a panel three-dimensional buffering bin.

Background

After the electronic product panel is glued, the panel needs to be cured naturally for a long time, the existing panel is often placed into a curing frame through a manual or mechanical arm, the panel is inconvenient to access, the automation degree is low, the access efficiency is low, and therefore the panel three-dimensional type buffering bin is provided for solving the problems.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a panel three-dimensional cache bin.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides a three-dimensional storehouse of buffering of panel, includes the frame, the upper surface of frame is provided with the storehouse of buffering, the storehouse of buffering includes the storehouse frame, be provided with the buffering frame that can reciprocate in the storehouse frame, buffering frame one side is provided with the elevating system that supplies the buffering frame to reciprocate, the frame upper surface still is provided with the handling device who transports the panel and still is provided with the access mechanism who is used for transporting the tray of placing the panel, access mechanism is including the bearing assembly who bears the tray and be used for transferring the tray to the access drive assembly in the buffering frame.

Preferably, the buffer storage bin comprises a bin frame fixedly arranged on the upper surface of the frame, an upper plate and a lower plate of the bin frame are connected through connecting columns, the buffer storage frame comprises a uniformly arranged sliding shaft connected between the upper plate and the lower plate, a placing frame is arranged on the sliding shaft in a sliding manner, and a plurality of rows of supporting rollers uniformly arranged from top to bottom are arranged on inner walls of two side plates in the placing frame.

Preferably, at least one front limiting rod is further installed between the upper plate and the lower plate of the bin frame, the front limiting rod is located at the inlet of the placement frame, and the front limiting rod is provided with an access opening.

Preferably, the back of the placing frame is provided with a rear limit rod and an adsorption piece, the rear limit rod is positioned at two sides of the adsorption piece, and one side of the tray is provided with an adsorption magnet matched with the adsorption piece; the back of the rack is also provided with a fan group.

Preferably, the lifting assembly comprises a mounting frame positioned at one side of the buffer storage frame, a motor is fixedly mounted on the mounting frame, a screw rod is mounted on the motor power transmission, and the screw rod is in transmission connection with the buffer storage frame.

Preferably, the handling device comprises a fixing frame arranged on the frame and positioned at the inlet of the cache bin, at least one first linear driving module is arranged on the fixing frame, a sliding plate is arranged on the fixing frame in a sliding mode, the sliding plate is connected with the power output end of the first linear driving module, a lifting cylinder is fixedly arranged on the side face of the sliding plate, a mounting seat is arranged at the power output end of the lifting cylinder, and a plurality of suckers are arranged on the mounting seat.

Preferably, the access driving assembly comprises a second linear driving module, a supporting frame is arranged at the power output end of the second linear driving module, a clamping cylinder is arranged on the supporting frame, a clamping mechanism is fixedly arranged at the power output end of the clamping cylinder, and the access driving assembly transfers the tray through the clamping mechanism.

Preferably, the bearing assembly comprises bearing plates respectively positioned at two sides of the access driving assembly, a plurality of limiting wheels horizontally arranged and bearing wheels vertically arranged are respectively arranged at the upper end parts of the bearing plates, and a detection sensor and a limiting block for limiting the position of the tray are further arranged on the inner side surface of the bearing plates.

Preferably, the clamping mechanism comprises a first clamping block fixedly connected to the side face of the tray, a clamping groove is formed in the first clamping block, the clamping mechanism further comprises a mounting plate fixedly mounted at the power output end of the clamping cylinder, and the end part of the outer side face of the mounting plate is fixedly connected with a second clamping block matched with the clamping groove.

Preferably, the buffer rack is also connected with a buffer piece, and the buffer piece is an air cylinder or a balancing weight; when the buffer piece is an air cylinder, the air cylinder is positioned at two sides of the lifting assembly, and the power output end of the air cylinder is connected with the buffer frame; when the cushioning piece is the balancing weight, storehouse frame top and one side are provided with the assembly pulley, set up the stay cord on the assembly pulley, and the balancing weight is connected to stay cord one end, and lifting unit is connected to the other end.

The utility model has the following advantages:

1. according to the utility model, the panel to be cached and solidified is placed on the tray positioned on the access mechanism through the carrying device, the tray provided with the panel is transferred into the cache frame through the access mechanism, when the tray provided with the panel is fully stored in the cache frame of one layer, the cache frame is only required to be moved up and down through the lifting assembly, so that one layer of the tray not provided with the panel is connected with the access mechanism, the tray provided with the panel can smoothly enter the cache frame to be cached and solidified, and the whole process from the carrying of the panel by the carrying device to the cache solidification in the cache frame is automatically completed, so that the automation degree and the cache solidification efficiency are greatly improved.

2. According to the utility model, the fan group is arranged on the back of the placing frame, so that the air flow speed in the placing frame can be increased, the curing speed of the panel is increased, and the tray is limited by arranging the rear limiting rod and the front limiting rod, so that the tray is prevented from being separated from the placing frame.

3. According to the utility model, the buffer piece is arranged to offset the weight of the buffer frame, so that the load of the lifting assembly is reduced, and the service life of the lifting assembly is prolonged.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

FIG. 2 is a schematic view of a non-pallet structure of a buffer bin according to the present utility model.

FIG. 3 is a schematic view of a buffer bin with trays according to the present utility model.

Fig. 4 is a schematic diagram of the structure of the back of the cache compartment according to the present utility model.

Fig. 5 is a schematic structural view of a handling device according to the present utility model.

FIG. 6 is a schematic diagram of an access mechanism according to the present utility model.

Fig. 7 is a schematic structural view of a bearing assembly according to the present utility model.

Fig. 8 is a schematic structural view of a tray and a clamping mechanism according to the present utility model.

Fig. 9 is a schematic structural diagram of a clamping mechanism in use state according to the present utility model.

Fig. 10 is a schematic view of the inner side wall structure of the rack according to the present utility model.

FIG. 11 is a schematic view of a damper according to the present utility model.

Fig. 12 is a schematic view of the structure of the front stop lever of the present utility model.

In the figure, 1, a rack; 2. a carrying device; 21. a fixing frame; 22. a first linear driving module; 23. a sliding plate; 24. a lifting cylinder; 25. a mounting base; 26. a suction cup; 3. an access mechanism; 31. accessing the drive assembly; 311. a second linear driving module; 312. a support frame; 313. a clamping cylinder; 32. a carrier assembly; 321. a carrying plate; 322. a limiting wheel; 323. a carrying wheel; 324. a detection sensor; 325. a limiting block; 4. a buffering bin; 41. a bin rack; 42. a cache rack; 421. a sliding shaft; 422. a placing rack; 423. supporting rollers; 424. a front limit rod; 425. an access port; 426. a fan set; 427. a rear limit rod; 428. an absorbing member; 43. a lifting assembly; 431. a mounting frame; 432. a motor; 433. a screw rod; 5. a tray; 6. a clamping mechanism; 61. a first clamping block; 62. a clamping groove; 63. a second clamping block; 64. a mounting plate; 7. a magnet is adsorbed; 8. and a buffer member.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

As in the embodiment shown in figures 1-12,

the utility model provides a three-dimensional storehouse of buffering of panel, includes frame 1, frame 1's upper surface is provided with buffering storehouse 4, buffering storehouse 4 includes storehouse frame 41, be provided with the buffering frame 42 that can reciprocate in the storehouse frame 41, buffering frame 42 one side is provided with the lifting unit 43 that supplies buffering frame 42 to reciprocate, frame 1 upper surface still is provided with the handling device 2 of transporting the panel and still is provided with the access mechanism 3 that is used for transporting the tray 5 of placing the panel, access mechanism 3 is including bearing the bearing unit 32 that bears tray 5 and be used for transferring the access drive assembly 31 in the buffering frame 42 with tray 5.

Referring to fig. 1, a panel to be subjected to cache curing is placed on a tray 5 located on an access mechanism 3 by a carrying device 2, the tray 5 with the panel is transferred to a cache frame 42 by the access mechanism 3, when the cache frame 42 of one layer is fully stored with the tray 5 with the panel, the cache frame 42 is only required to be moved up and down by a lifting component 43, so that one layer of the tray 5 without the panel is connected with the access mechanism 3, the tray 5 with the panel can smoothly enter the cache frame 42 for cache curing, and the whole process of cache curing from the carried device 2 to the cache frame 42 is completed automatically without manual participation, thereby greatly improving the automation degree and the cache curing efficiency.

The buffer storage storehouse 4 is including fixed the storehouse frame 41 that sets up at frame 1 upper surface, the upper plate and the hypoplastron of storehouse frame 41 pass through the spliced pole and connect, buffer storage frame 42 includes the even sliding shaft 421 that sets up of connection between upper plate and the hypoplastron, sliding shaft 421 is last to slide and is provided with rack 422, both sides inboard wall is provided with the supporting roller 423 that the multirow from last even setting down in the rack 422.

Referring to fig. 2 and 3, the tray 5 with the panel is placed on the supporting roller 423, and can slide on the supporting roller 423 when the tray 5 is stored or taken out, so that the tray 5 can conveniently get in and out, and the supporting roller can be made of metal or nonmetal, and in this embodiment, the supporting roller is a roller mounted on the inner wall of the side plate of the rack 422 by adopting a bearing.

At least one front limiting rod 424 is further installed between the upper plate and the lower plate of the bin frame 41, the front limiting rod 424 is located at the entrance of the placement frame 422, and an access opening 425 is formed in the front limiting rod 424.

When the tray 5 is accessed to the rack 422, the tray 5 passes through the access opening 425 on the front limit rod 424 and then reaches the supporting roller 423 in the rack 422, and the front limit rod 424 can prevent the tray 5 from sliding out to cause the chuck under vibration or other abnormal conditions.

The back of the placement frame 422 is provided with a back limiting rod 427 and an adsorption piece 428, the back limiting rod 427 is positioned at two sides of the adsorption piece 428, and one side of the tray 5 is provided with an adsorption magnet 7 which is matched with the adsorption piece 428; the back of the rack 422 is also provided with a fan set 426.

The tray 5 in the rack 422 can be retreated in a consistent position through the rear limiting rod 427, but the tray 5 enters the rack 422 and then is adsorbed by the adsorption magnet 7 on one side of the tray 5 and the adsorption magnet 7 adsorbed by the adsorption piece 428, so that the tray 5 is ensured not to slide out of the rack 422, the air flow speed in the rack 422 can be accelerated after the fan group 426 is started, and the panel curing speed is further accelerated.

The lifting assembly 43 comprises a mounting frame 431 positioned on one side of the buffer frame 42, a motor 432 is fixedly mounted on the mounting frame 431, a screw 433 is mounted on the power transmission of the motor 432, and the screw 433 is in transmission connection with the buffer frame 42.

Referring to fig. 3, the motor 432 is used to start the rotation of the surrogate screw 433, and since the screw 433 is in transmission connection with the buffer frame 42, the specific screw 433 is in transmission connection with the placement frame 422, that is, the screw 433 rotates to drive the placement frame 422 to move up and down, so that the placement layer of the placement frame 422, where the tray 5 is not placed, is connected with the access mechanism 3, and the tray 5 where the panel is conveniently placed is stored, and in this embodiment, the motor 432 is a servo motor.

The carrying device 2 comprises a fixing frame 21 arranged on the frame 1 and positioned at the inlet of the buffer bin 4, at least one first linear driving module 22 is arranged on the fixing frame 21, a sliding plate 23 is arranged on the fixing frame 21 in a sliding mode, the sliding plate 23 is connected with the power output end of the first linear driving module 22, a lifting cylinder 24 is fixedly arranged on the side face of the sliding plate 23, an installation seat 25 is arranged at the power output end of the lifting cylinder 24, and a plurality of suckers 26 are arranged on the installation seat 25.

Referring to fig. 5, in this embodiment, two first linear driving modules 22 are disposed on the fixing frame 21, when a panel needs to be subjected to a board, the first linear driving modules 22 drive the sliding plate 23 to move and suck the panel in the previous process through the suction cup 26, then the panel sucked by the suction cup 26 is transferred to the access mechanism 3 under the linkage of the first linear driving modules 22 and the lifting cylinder 24, then the sucked panel is placed into the tray 5 on the access mechanism 3 through the suction cup 26, and then the panel waits to be transferred to the buffer frame 42, and the lifting cylinder 24 can be replaced by an adaptive linear driving module as long as the component can realize linear motion.

The access driving assembly 31 comprises a second linear driving module 311, a supporting frame 312 is installed at the power output end of the second linear driving module 311, a clamping cylinder 313 is installed on the supporting frame 312, a clamping mechanism 6 is fixedly installed at the power output end of the clamping cylinder 313, and the access driving assembly 31 transfers the tray 5 through the clamping mechanism 6.

The bearing assembly 32 comprises bearing plates 321 respectively positioned at two sides of the access driving assembly 31, a plurality of limiting wheels 322 horizontally arranged and a plurality of bearing wheels 323 vertically arranged are respectively arranged at the upper end parts of the bearing plates 321, and a detection sensor 324 and a limiting block 325 for limiting the position of the tray 5 are also arranged on the inner side surface of the bearing plates 321.

The upper portion of the outer surface of the carrier wheel 323 is flush with the access opening 425 to facilitate removal and transfer of the trays 5 from the racks 422 to the carrier wheel 323

Referring to fig. 6, 7 and 8, the detection sensor 324 detects whether the tray 5 reaches a predetermined position, the stopper 325 limits the tray, the position preventing the tray from moving is not at the predetermined position, and referring to fig. 8, it can be seen that one step surface is provided on both sides of the tray 5, the upper surface of the step surface is closely attached to the bearing wheel 323, the side surface of the step surface is closely attached to the limiting wheel 322, the bearing wheel 323 supports the tray, the limiting wheel 322 limits the tray left and right to move along the predetermined track, and the upper part of the end of the bearing plate 321 close to the buffer frame 42 is also provided with a limiting wheel (not labeled in the figure) for limiting the tray up and down.

The clamping mechanism 6 comprises a first clamping block 61 fixedly connected to the side face of the tray 5, a clamping groove 62 is formed in the first clamping block 61, the clamping mechanism further comprises a mounting plate 64 fixedly mounted at the power output end of a clamping cylinder 313, and a second clamping block 63 matched with the clamping groove 62 is fixedly connected to the end part of the outer side face of the mounting plate 64.

When the tray 5 with the panel needs to be transferred into the buffer storage rack 42, firstly, the clamping cylinder 313 is started to enable the two second clamping blocks 63 to be close to each other, then the second linear driving module 311 is started to drive the clamping cylinder 313 positioned on the support frame 312 to move, the second clamping block 63 at the output end of the clamping cylinder 313 is positioned in the clamping groove 62, when the second clamping block 63 is positioned in the clamping groove 62, the clamping cylinder 313 is started to enable the two second clamping blocks 63 to be far away from each other, the second clamping block 63 is tightly attached to the inner wall of the clamping groove 62, and then the second linear driving module 311 is started to drive the tray 5 to pass through the access opening 425 to the placement rack 422; when the tray 5 is taken out from the rack 422, the second linear driving module 311 and the clamping cylinder 313 place the second clamping block 63 into the clamping groove 62, and then the tray 5 is taken out from the rack 422 by the second linear driving module 311.

The buffer rack 42 is also connected with a buffer piece 8, and the buffer piece 8 is an air cylinder or a balancing weight; when the buffer member 8 is a cylinder, the cylinder is positioned at two sides of the lifting assembly 43, and the power output end of the cylinder is connected with the buffer frame 42; when the buffer member 8 is a balancing weight, a pulley block is arranged above the bin frame 41 and on one side, a pull rope is arranged on the pulley block, one end of the pull rope is connected with the balancing weight, and the other end of the pull rope is connected with the lifting assembly 43.

The weight of the buffer frame 42 can be offset by arranging the buffer 8, so that the load of the lifting assembly 43 is reduced, and the service life of the lifting assembly 43 is prolonged.

When the cylinder is used as the buffer piece 8, the air inlet of the cylinder is connected with constant pressure high-pressure air, and the air pressure value is calculated according to the conversion of the actual weight of the buffer frame 42 into the air pressure value required by the output force of the cylinder so as to achieve the upward thrust of the end face of the extension rod of the cylinder to maintain constant so as to offset the whole weight of the buffer frame 42. When the buffer frame 42 is lifted upwards, the cylinder extension rod can rise along with the buffer frame 42, and the weight of the buffer frame 42 can be counteracted due to the fact that the lower air inlet is constant high-pressure air and the output force of the cylinder is unchanged. When the buffer frame 42 descends, the cylinder extension rod moves downwards along with the buffer frame 42, but high-pressure air in the cylinder cavity can be compressed at the moment, so that overflow is needed at the moment, namely, the air in the cylinder is discharged out of a part of the cylinder cavity to maintain the air pressure value in the cylinder cavity unchanged, the constant thrust output by the end face of the output rod of the cylinder is ensured, and the effect of stabilizing the counterweight is achieved.

When the balancing weight is used as a buffer, the balancing weight rises or falls along with the buffer frame 42 at the same time, the balancing weight can be made of iron blocks or other metal or nonmetal substances, the weight of the balancing weight can be the weight of the buffer frame 42, and the weight of the specific balancing weight is set according to requirements.

In this embodiment, the linear driving module may be a motor screw linear driving module, a motor synchronous belt linear driving module, or the like, and may be a component capable of realizing linear movement

The working process of the utility model is as follows: firstly, a panel in the previous procedure is carried to a tray 5 at the position of an access mechanism 3 through a carrying device 2, then the tray 5 with the panel is transported to a supporting roller 423 on the inner wall of a side plate of a placing frame 422 through an access opening 425 through the access mechanism 3, and when one layer of the placing frame 422 is full, the placing frame 422 is driven to move up and down only through a lifting assembly 43, so that one layer of the placing frame 422 without the tray 5 is level with the access opening 425, and the next tray 5 with the panel is convenient to place in; after one layer of the panels in the placing frame 422 is cured, one layer of the tray 5 with the cured panels is leveled with the access opening 425 through the lifting assembly 43, and then the tray 5 with the cured panels is taken out through the access mechanism 3; the whole storage process follows the principle of first storing and first taking out, and the specific storage curing time is designed according to the needs.

Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. A panel three-dimensional type buffering bin is characterized in that: including frame (1), the upper surface of frame (1) is provided with and caches storehouse (4), it includes storehouse frame (41) to cache storehouse (4), be provided with in storehouse frame (41) and reciprocate cache frame (42), cache frame (42) one side is provided with supplies cache frame (42) to carry out elevating system (43) that reciprocate, frame (1) upper surface still is provided with handling device (2) of transporting the panel and still is provided with access mechanism (3) that are used for transporting tray (5) of placing the panel, access mechanism (3) are including bearing subassembly (32) that bear tray (5) and be used for transferring tray (5) to access drive assembly (31) in cache frame (42).

2. The panel stereoscopic cache of claim 1, wherein: the utility model provides a buffer memory storehouse (4) is including fixed storehouse frame (41) that sets up at frame (1) upper surface, the upper plate and the hypoplastron of storehouse frame (41) are passed through the spliced pole and are connected, buffer memory frame (42) are including evenly set up sliding shaft (421) of being connected between upper plate and the hypoplastron, sliding shaft (421) are gone up to slide and are provided with rack (422), both sides inboard wall is provided with multi-row from last supporting roller (423) that evenly set up down in rack (422).

3. The panel stereoscopic cache of claim 2, wherein: at least one front limiting rod (424) is further arranged between the upper plate and the lower plate of the bin frame (41), the front limiting rod (424) is located at the inlet of the placing frame (422), and an access port (425) is formed in the front limiting rod (424).

4. The panel stereoscopic cache of claim 2, wherein: the back of the placement frame (422) is provided with a rear limit rod (427) and an adsorption piece (428), the rear limit rod (427) is positioned at two sides of the adsorption piece (428), and one side of the tray (5) is provided with an adsorption magnet (7) which is matched with the adsorption piece (428); the back of the placement frame (422) is also provided with a fan group (426).

5. The panel stereoscopic cache of claim 2, wherein: the lifting assembly (43) comprises a mounting frame (431) positioned on one side of the buffer storage frame (42), a motor (432) is fixedly mounted on the mounting frame (431), a screw rod (433) is mounted on a power transmission of the motor (432), and the screw rod (433) is in transmission connection with the buffer storage frame (42).

6. The panel stereoscopic cache of claim 1, wherein: the carrying device comprises a fixing frame (21) arranged on a rack (1) and positioned at an inlet of a storage bin (4), at least one first linear driving module (22) is arranged on the fixing frame (21), a sliding plate (23) is arranged on the fixing frame (21) in a sliding mode, the sliding plate (23) is connected with a power output end of the first linear driving module (22), a lifting cylinder (24) is fixedly arranged on the side face of the sliding plate (23), an installation seat (25) is arranged at the power output end of the lifting cylinder (24), and a plurality of suckers (26) are arranged on the installation seat (25).

7. The panel stereoscopic cache of claim 1, wherein: the access driving assembly (31) comprises a second linear driving module (311), a supporting frame (312) is arranged at the power output end of the second linear driving module (311), a clamping cylinder (313) is arranged on the supporting frame (312), a clamping mechanism (6) is fixedly arranged at the power output end of the clamping cylinder (313), and the access driving assembly (31) transfers the tray (5) through the clamping mechanism (6).

8. The panel stereoscopic cache of claim 1, wherein: the bearing assembly (32) comprises bearing plates (321) which are respectively positioned at two sides of the access driving assembly (31), a plurality of limiting wheels (322) which are horizontally arranged and bearing wheels (323) which are vertically arranged are respectively arranged at the upper end parts of the bearing plates (321), and a detection sensor (324) and a limiting block (325) of the position of the tray (5) are further arranged on the inner side surface of the bearing plates (321).

9. The panel stereoscopic cache of claim 7, wherein: the clamping mechanism (6) comprises a first clamping block (61) fixedly connected to the side face of the tray (5), a clamping groove (62) is formed in the first clamping block (61), the clamping mechanism further comprises a mounting plate (64) fixedly mounted at the power output end of the clamping cylinder (313), and a second clamping block (63) matched with the clamping groove (62) is fixedly connected to the end part of the outer side face of the mounting plate (64).

10. A panel stereoscopic buffer compartment according to any one of claims 1 to 9, wherein: the buffer rack (42) is also connected with a buffer piece (8), and the buffer piece (8) is an air cylinder or a balancing weight; when the buffer piece (8) is an air cylinder, the air cylinder is positioned at two sides of the lifting assembly (43), and the power output end of the air cylinder is connected with the buffer frame (42); when the buffer piece (8) is a balancing weight, a pulley block is arranged above the bin frame (41) and on one side of the bin frame, a pull rope is arranged on the pulley block, one end of the pull rope is connected with the balancing weight, and the other end of the pull rope is connected with the lifting assembly (43).