Water-soluble granular fertilizer vibration screening device

Abstract

The utility model relates to the technical field of fertilizer production, in particular to a water-soluble granular fertilizer vibration screening device which is simple in vibration structure, reduces collision, noise and abrasion between structures, and prolongs the service life of the device. Comprising a machine frame, a plurality of screen frames and a material receiving groove, the machine frame is composed of a plurality of stand columns and cross beams, the screen frames are installed on the stand columns of the machine frame, the screen frames are vertically arranged, screen holes of the screen frames are sequentially reduced from top to bottom, and the material receiving groove is installed on the lower portion of the machine frame and located below the screen frames. The vibrating screen further comprises a plurality of telescopic rods, a plurality of springs, a vibrating beam and a vibrating motor, the telescopic rods are installed on the multiple stand columns of the rack, the telescopic rods are sleeved with the springs respectively, the two ends of the springs are connected with the upper ends and the lower ends of the two telescopic rods respectively, and the telescopic rods and the springs are located among the screen frames respectively. The two ends of the vibrating beam are connected with the two stand columns of the machine frame, and the vibrating motor is installed on the vibrating beam.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fertilizer production particularly relates to a water -soluble granular fertilizer vibrating screening device. BACKGROUND

[0002] Water -soluble granular fertilizer needs to carry out vibration screening to granule in the production process, and a variety of granular fertilizer vibrating screening devices are disclosed in the prior art, for example, the vibrating screen of the organic-inorganic compound fertilizer production of the Chinese utility model patent with the publication number CN222241226U proposes, the vibrating screen according to the demand installs the screening net frame of different screen void size from the top of the device to the inside of the installation slot in turn from big to small, then the fertilizer needing to be screened is poured on the screening net frame in the uppermost to carry out layer-by-layer screening, by assembling the support frame part according to the need, cooperate with the screening net frame of different size, reach the beneficial effect that the device can simultaneously screen the fertilizer of different size when using, according to the need along the fixed block installed on the top of support frame and the recess groove opened below support frame cooperate, the support frame part is added, according to the number of screening classification needed to determine the number of addition, through the mutual cooperation design of support frame, vibrating stand, screening net frame and rotating motor, transmission belt etc., reach the beneficial effect that the device can quickly split the device when overhauling later.

[0003] But the vibration structure of the screening device above is relatively complex, it makes multiple screening net frames vibrate by rotating and colliding with the bottom of vibrating stand through pushing ring, due to the mutual collision between structures, leading to larger noise, and the wear between structures is also larger, causing the service life of the device to decline. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a water -soluble granular fertilizer vibrating screening device, which is relatively simple in vibration structure, reduces the collision, noise and wear between structures, and improves the service life of the device.

[0005] The utility model discloses a water -soluble granular fertilizer vibrating screening device, including frame, a plurality of screen frame and receiving trough, and the frame is formed by a plurality of stand and crossbeam, a plurality of screen frame are installed on the stand of frame, a plurality of screen frame are arranged up and down, the screen hole of a plurality of screen frame is reduced in turn from top to bottom, and the receiving trough is installed in the lower part of frame, and the receiving trough is located below a plurality of screen frame, still including a plurality of telescopic link, a plurality of spring, vibrating beam and vibrating motor, a plurality of telescopic link are installed on the stand of frame, a plurality of spring are respectively sheathed in a plurality of telescopic link outside, and the both ends of a plurality of spring are connected the upper end and lower end of two telescopic links respectively, a plurality of telescopic link and a plurality of spring are located between a plurality of screen frame respectively, and the both ends of vibrating beam are connected with the stand of frame, and vibrating motor is installed on vibrating beam, the stand of frame is installed a plurality of telescopic link and a plurality of spring, so that a plurality of telescopic link and a plurality of spring elastically support a plurality of screen frame, water -soluble granular fertilizer is sent to the uppermost screen frame, and vibrating motor runs and generates vibration force, and the vibration force is transmitted to the frame through vibrating beam and then is transmitted to a plurality of screen frame, so that a plurality of screen frame vibrate, a plurality of screen frame vibrate and carry out vibrating screening to water -soluble granular fertilizer, so that water -soluble granular fertilizer passes through the screen hole of a plurality of screen frame in turn and is conveyed downward, and a plurality of screen frame respectively intercepts and gathers the water -soluble granular fertilizer that is greater than the screen hole diameter of it, since the screen hole of a plurality of screen frame is reduced in turn from top to bottom, the water -soluble granular fertilizer that passes through the screen hole of the lowermost screen frame falls on the receiving trough, so that a plurality of screen frame classifies and screens water -soluble granular fertilizer from big to small, compared with prior art vibrating structure, the collision between structures is smaller, reduces noise and abrasion between structures, and improves the service life of the device.

[0006] Preferably, it further includes a plurality of arc grooves, a plurality of front shafts and a plurality of rear shafts, a plurality of arc grooves are arranged on the rear stand of the frame, a front shaft is arranged on the front end of each of the plurality of screen frames, and a rear shaft is arranged on the rear end of each of the plurality of screen frames, the plurality of front shafts are rotatably connected to the front stand of the frame, and the plurality of rear shafts are slidably arranged in the plurality of arc grooves; the plurality of screen frames are movably arranged on the frame via the plurality of front shafts and the plurality of rear shafts, when the water-soluble granular fertilizer is being screened, the plurality of rear shafts are located at the bottom of the plurality of arc grooves, and the plurality of screen frames are horizontally arranged, after the screening of the batch of water-soluble granular fertilizer is completed, the plurality of rear shafts are moved to the top of the plurality of arc grooves, so that the plurality of screen frames are inclined, and the water-soluble granular fertilizer is discharged through the front ends of the plurality of screen frames, thereby improving the discharging efficiency.

[0007] Preferably, the device further comprises a push cylinder, a vertical rod, a plurality of horizontal rods and a plurality of pull rods, the fixed end of the push cylinder is installed outside the rear of the frame, the vertical rod is vertically installed on the upper end of the piston rod of the push cylinder, the plurality of horizontal rods are installed on the vertical rod, the rear ends of the plurality of pull rods are respectively rotatably connected with the plurality of horizontal rods, and the front ends of the plurality of pull rods are respectively rotatably connected with the plurality of rear shafts; the piston rod of the push cylinder is elongated to lift the vertical rod, the vertical rod drives the plurality of horizontal rods to be lifted, the plurality of horizontal rods drive the plurality of rear shafts to be lifted along the plurality of arc-shaped grooves through the plurality of pull rods, so that the rear ends of the plurality of screen frames are automatically lifted, the water-soluble granular fertilizer in the screen frame is discharged, and the discharging efficiency is improved.

[0008] Preferably, the device further comprises a vertical shaft and a sliding block, the vertical shaft is vertically installed on the rear side of the push cylinder, and the sliding block is slidably installed on the vertical shaft and connected with the vertical rod; the sliding block is slidably lifted along the vertical shaft to limit the lifting of the vertical rod, so that the stability of the vertical rod is improved.

[0009] Preferably, the device further comprises a plurality of fans, the plurality of fans are respectively installed on the vertical rod through the support, and the plurality of fans respectively blow air between the plurality of screen frames; when the plurality of screen frames vibrate to screen the water-soluble granular fertilizer, the plurality of fans blow air between the plurality of screen frames to blow out the light impurities in the water-soluble granular fertilizer, so that the quality of the water-soluble granular fertilizer is improved.

[0010] Preferably, the device further comprises a plurality of gate plates and a plurality of drive rods, the plurality of gate plates are respectively located in the front ends of the plurality of screen frames, the upper ends of the plurality of gate plates are respectively installed with the plurality of drive rods, and the plurality of drive rods are rotatably connected with the front vertical column of the frame; the plurality of gate plates are rotatably installed on the front vertical column of the frame through the plurality of drive rods, so that the plurality of gate plates respectively close the front ends of the plurality of screen frames, and the water-soluble granular fertilizer is prevented from leaking and falling off when the water-soluble granular fertilizer is screened by vibration; when the water-soluble granular fertilizer needs to be discharged, the plurality of drive rods are rotated to overturn and open the plurality of gate plates, so that the discharging is facilitated.

[0011] Preferably, the device further comprises a plurality of lower pull rods, a plurality of middle pull rods and a plurality of push rods, the plurality of lower pull rods are respectively installed on the plurality of front shafts and all face the rear side of the frame, the lower ends of the plurality of middle pull rods are respectively rotatably connected with the rear ends of the plurality of lower pull rods, the upper ends of the plurality of middle pull rods are respectively rotatably connected with the lower ends of the plurality of push rods, and the upper ends of the plurality of push rods are respectively installed on the plurality of drive rods; when the rear ends of the screen frames are lifted to make the screen frames be inclined, the screen frames drive the front shafts to rotate, the front shafts drive the lower pull rods to rotate, the lower pull rods drive the lower ends of the push rods forward through the middle pull rods, the push rods drive the gate plates to be rotated and overturned forward through the drive rods, so that the screen frames are linked with the plurality of gate plates to be overturned and opened when the screen frames are rotated and inclined, and the practicability is good.

[0012] Compared with the prior art, the device has the beneficial effects that: the vibration structure is relatively simple, the collision between structures is small, the noise and the abrasion between structures are reduced, and the service life of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the utility model;

[0014] Figure 2 is a structural schematic view of the utility model in the axon;

[0015] Figure 3 is a structural schematic view of the utility model in the front section;

[0016] Figure 4 is a structural schematic view of the structure of rack, receiving trough, telescopic rod, spring, vibration beam and vibration motor etc.;

[0017] Figure 5 is a structural schematic view of the structure of screen frame, rear axle, push cylinder, vertical rod, cross rod, pull rod and vertical axle etc.;

[0018] Figure 6 is a structural schematic view of the structure of screen frame, front axle, rear axle, gate, drive rod, lower pull rod, middle pull rod and push rod etc.

[0019] Mark in the drawing: 1, rack;2, screen frame;3, receiving trough;4, telescopic rod;5, spring;6, vibration beam;7, vibration motor;8, arc slot;9, front axle;10, rear axle;11, push cylinder;12, vertical rod;13, cross rod;14, pull rod;15, vertical axle;16, sliding block;17, fan;18, gate;19, drive rod;20, lower pull rod;21, middle pull rod;22, push rod. Specific implementation

[0020] In order to facilitate understanding the utility model, the utility model will be described more fully below with reference to relevant drawings.The utility model can be realized in many different forms, and is not limited to the embodiments described herein.Contrarily, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] As Figures 1 to 4As shown, a water-soluble granular fertilizer vibrating screening device, comprising a rack 1, a plurality of screen frames 2 and a receiving trough 3, the rack 1 is composed of a plurality of columns and cross beams, a plurality of screen frames 2 are installed on the columns of the rack 1, a plurality of screen frames 2 are arranged up and down, the screen holes of a plurality of screen frames 2 decrease in turn from top to bottom, the receiving trough 3 is installed at the lower part of the rack 1, and the receiving trough 3 is located below a plurality of screen frames 2; further comprising a plurality of telescopic rods 4, a plurality of springs 5, a vibrating beam 6 and a vibrating motor 7, a plurality of telescopic rods 4 are installed on each of the columns of the rack 1, a plurality of springs 5 are respectively sleeved on the outer sides of a plurality of telescopic rods 4, the two ends of a plurality of springs 5 are respectively connected to the upper end and the lower end of two telescopic rods 4, a plurality of telescopic rods 4 and a plurality of springs 5 are respectively located between a plurality of screen frames 2, the two ends of the vibrating beam 6 are connected with two columns of the rack 1, and the vibrating motor 7 is installed on the vibrating beam 6.

[0023] The telescopic rods 4 and the springs 5 are installed on the columns of the rack 1, so that the telescopic rods 4 and the springs 5 elastically support the screen frames 2, the water-soluble granular fertilizer is delivered to the uppermost screen frame 2, the vibrating motor 7 operates to generate a vibrating force, the vibrating force is transmitted to the rack 1 through the vibrating beam 6 and then to the screen frames 2, so that the screen frames 2 vibrate, the screen frames 2 vibrate to vibrate and screen the water-soluble granular fertilizer, so that the water-soluble granular fertilizer passes through the screen holes of the screen frames 2 in turn and is delivered downward, at the same time, the screen frames 2 respectively intercept and gather the water-soluble granular fertilizer larger than the diameter of the screen holes, since the screen holes of the screen frames 2 decrease in turn from top to bottom, the water-soluble granular fertilizer passing through the screen holes of the lowermost screen frame 2 falls on the receiving trough 3, so that the screen frames 2 grade and screen the water-soluble granular fertilizer from large to small, compared with the prior art, the vibrating structure is relatively simple, the collision between the structures is small, the noise and the wear between the structures are reduced, and the service life of the device is improved.

[0024] Example 2

[0025] As Figures 1 to 6As shown, on the basis of embodiment 1, further comprising a plurality of arc-shaped grooves 8, a plurality of front shafts 9 and a plurality of rear shafts 10, a plurality of arc-shaped grooves 8 are arranged on the rear side columns of the rack 1, the front ends of the plurality of screen frames 2 are each installed with a front shaft 9, the rear ends of the plurality of screen frames 2 are each installed with a rear shaft 10, the plurality of front shafts 9 are rotationally connected with the front side columns of the rack 1, and the plurality of rear shafts 10 are each slidingly installed in the plurality of arc-shaped grooves 8; further comprising a push cylinder 11, a vertical rod 12, a plurality of cross rods 13 and a plurality of pull rods 14, the fixed end of the push cylinder 11 is installed outside the rear of the rack 1, the vertical rod 12 is vertically installed on the upper end of the piston rod of the push cylinder 11, the plurality of cross rods 13 are installed on the vertical rod 12, the rear ends of the plurality of pull rods 14 are each rotationally connected with the plurality of cross rods 13, and the front ends of the plurality of pull rods 14 are each rotationally connected with the plurality of rear shafts 10; further comprising a vertical shaft 15 and a sliding block 16, the vertical shaft 15 is vertically installed on the rear side of the push cylinder 11, and the sliding block 16 is slidingly installed on the vertical shaft 15, and the sliding block 16 is connected with the vertical rod 12; further comprising a plurality of shutter plates 18 and a plurality of drive rods 19, the plurality of shutter plates 18 are each located in the front end port of the plurality of screen frames 2, the upper ends of the plurality of shutter plates 18 are each installed with a drive rod 19, and the plurality of drive rods 19 are rotationally connected with the front columns of the rack 1; further comprising a plurality of lower pull rods 20, a plurality of middle pull rods 21 and a plurality of push rods 22, the plurality of lower pull rods 20 are each installed on the plurality of front shafts 9, the plurality of lower pull rods 20 are each towards the rear side of the rack 1, the lower ends of the plurality of middle pull rods 21 are each rotationally connected with the rear ends of the plurality of lower pull rods 20, the upper ends of the plurality of middle pull rods 21 are each rotationally connected with the lower ends of the plurality of push rods 22, and the upper ends of the plurality of push rods 22 are each installed on the plurality of drive rods 19.

[0026] The plurality of screen frames 2 are movably mounted on the frame 1 through the plurality of front shafts 9 and the plurality of rear shafts 10, when the water-soluble granular fertilizer is vibrated and screened, the plurality of rear shafts 10 are respectively located at the bottom of the plurality of arc-shaped grooves 8, the plurality of screen frames 2 are horizontally placed, the plurality of gate plates 18 are rotatably mounted on the front vertical column of the frame 1 through the plurality of drive rods 19, so that the plurality of gate plates 18 respectively close the front ends of the plurality of screen frames 2, to avoid the water-soluble granular fertilizer from leaking and falling off when the water-soluble granular fertilizer is vibrated and screened, after the batch of water-soluble granular fertilizer is vibrated and screened, the piston rod of the push cylinder 11 is elongated to lift the vertical rod 12 to a height, the sliding block 16 slides up and down along the vertical shaft 15 to slide and limit the lifting of the vertical rod 12, to improve the stability of the vertical rod 12, the vertical rod 12 drives the plurality of horizontal rods 13 to be lifted, the plurality of horizontal rods 13 respectively drive the plurality of rear shafts 10 to be lifted to the top along the plurality of arc-shaped grooves 8 through the plurality of pull rods 14, so that the plurality of screen frames 2 are respectively tilted around the plurality of front shafts 9, when the screen frame 2 is tilted, the screen frame 2 drives the front shaft 9 to rotate, the front shaft 9 drives the lower pull rod 20 to rotate, the lower pull rod 20 drives the lower end of the push rod 22 to move forward through the middle pull rod 21, so that the push rod 22 drives the gate plate 18 to rotate and flip forward through the drive rod 19, so that the screen frame 2 is linked to the plurality of gate plates 18 to flip and open when rotating and tilting, so that the water-soluble granular fertilizer is discharged through the front end of the plurality of screen frames 2, to improve the discharging efficiency.

[0027] Example 3

[0028] As Figure 1 , Figure 2 , Figure 3 and Figure 5 indicated, on the basis of example 1, further comprising a plurality of fans 17, the plurality of fans 17 are respectively mounted on the vertical rod 12 through the support, the plurality of fans 17 respectively blow air between the plurality of screen frames 2; when the plurality of screen frames 2 vibrate and screen the water-soluble granular fertilizer, the plurality of fans 17 operate to blow air between the plurality of screen frames 2, to blow out the light impurities in the water-soluble granular fertilizer, to improve the quality of the water-soluble granular fertilizer.

[0029] As Figures 1 to 6As shown, the water-soluble granular fertilizer vibrating screening device of the utility model, in working, first water-soluble granular fertilizer is sent to the uppermost sieve frame 2, the vibration motor 7 runs and generates vibration force, and the vibration force is transmitted to the rack 1 through the vibrating beam 6 and then to the multiple sieve frames 2, so that the multiple sieve frames 2 vibrate, the multiple sieve frames 2 vibrate to vibrate screen the water-soluble granular fertilizer, the water-soluble granular fertilizer passes through the sieve holes of the multiple sieve frames 2 in turn and is conveyed downward, meanwhile, the multiple sieve frames 2 respectively intercept and gather the water-soluble granular fertilizer larger than the sieve hole diameter, then, due to the sieve holes of the multiple sieve frames 2 gradually decrease from top to bottom, the water-soluble granular fertilizer passing through the sieve hole of the lowermost sieve frame 2 falls on the receiving groove 3, so that the multiple sieve frames 2 classify and screen the water-soluble granular fertilizer from large to small, then, when the multiple sieve frames 2 vibrate and screen the water-soluble granular fertilizer, the multiple blowers 17 run to blow air between the multiple sieve frames 2, so that the light impurities in the water-soluble granular fertilizer are blown out, finally, after the vibration screening is completed, the piston rod of the push cylinder 11 is elongated to lift the vertical rod 12, the vertical rod 12 drives the multiple horizontal rods 13 to be lifted, the multiple horizontal rods 13 respectively pull the multiple rear shafts 10 along the multiple arc-shaped grooves 8 through the multiple pull rods 14, so that the rear ends of the multiple sieve frames 2 are automatically lifted, when the sieve frame 2 is inclined, the sieve frame 2 drives the front shaft 9 to rotate, the front shaft 9 drives the lower pull rod 20 to rotate, the lower pull rod 20 drives the lower end of the push rod 22 forward through the middle pull rod 21, so that the push rod 22 drives the shutter 18 to rotate and flip forward through the driving rod 19, so that the sieve frame 2 rotates and inclines and drives the multiple shutters 18 to flip and open, and the water-soluble granular fertilizer in the sieve frame 2 is discharged.

[0030] The main functions realized by the utility model are as follows:

[0031] 1. The vibration structure is simple, the collision between structures is small, the noise and abrasion between structures are reduced, and the service life of the device is improved.

[0032] 2. The device can automatically discharge materials and is practical.

[0033] 3. The light impurities in the water-soluble granular fertilizer are blown out by blowing air between the multiple sieve frames 2, and the quality of the water-soluble granular fertilizer is improved.

[0034] The water-soluble granular fertilizer vibrating screening device of the utility model is installed, connected or arranged in a common mechanical manner, and can be implemented as long as the beneficial effects can be achieved; the rack 1, the sieve frame 2, the receiving groove 3, the telescopic rod 4, the spring 5, the vibration motor 7, the front shaft 9, the rear shaft 10, the push cylinder 11, the vertical shaft 15, the sliding block 16 and the blower 17 are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the need for the technical personnel in the field to make creative efforts.

[0035] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting. As used in this patent, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] The preferred embodiments of the present application have been described above with the aid of drawing only. It will be apparent, however, to those skilled in the art that modifications and improvements can be made without departing from the scope and spirit of the application.

Claims

1. A water-soluble granular fertilizer vibrating screening device, comprising a frame (1), a plurality of screen frames (2) and a receiving trough (3), the frame (1) is composed of a plurality of vertical columns and cross beams, the plurality of screen frames (2) are installed on the vertical columns of the frame (1), the plurality of screen frames (2) are arranged in an up-down manner, the screen holes of the plurality of screen frames (2) are sequentially reduced from top to bottom, and the receiving trough (3) is installed at the lower part of the frame (1) and is located below the plurality of screen frames (2); characterized in that, It also includes a plurality of telescopic rods (4), a plurality of springs (5), a vibrating beam (6) and a vibrating motor (7), a plurality of telescopic rods (4) are installed on the plurality of columns of the rack (1), a plurality of springs (5) are respectively sleeved outside a plurality of telescopic rods (4), the two ends of a plurality of springs (5) are respectively connected to the upper end and the lower end of two telescopic rods (4), a plurality of telescopic rods (4) and a plurality of springs (5) are respectively located between a plurality of screen frames (2), the two ends of the vibrating beam (6) are connected with the two columns of the rack (1), and the vibrating motor (7) is installed on the vibrating beam (6); It also includes a plurality of arc-shaped grooves (8), a plurality of front shafts (9) and a plurality of rear shafts (10), a plurality of arc-shaped grooves (8) are arranged on the rear column of the rack (1), the front ends of the plurality of screen frames (2) are each provided with a front shaft (9), and the rear ends of the plurality of screen frames (2) are each provided with a rear shaft (10). The plurality of front shafts (9) are rotatably connected with the front column of the rack (1), and the plurality of rear shafts (10) are respectively slidably installed in the plurality of arc-shaped grooves (8).

2. The water-soluble granular fertilizer vibrating screening apparatus according to claim 1, wherein It also includes a push cylinder (11), a vertical rod (12), a plurality of horizontal rods (13) and a plurality of pull rods (14), the fixed end of the push cylinder (11) is installed outside the rear of the rack (1), the vertical rod (12) is vertically installed on the upper end of the piston rod of the push cylinder (11), the plurality of horizontal rods (13) are installed on the vertical rod (12), the rear ends of the plurality of pull rods (14) are respectively rotatably connected with the plurality of horizontal rods (13), and the front ends of the plurality of pull rods (14) are respectively rotatably connected with the plurality of rear shafts (10).

3. The water soluble granular fertilizer vibrating screening apparatus as claimed in claim 2, wherein, It also includes a vertical shaft (15) and a sliding block (16), the vertical shaft (15) is vertically installed on the rear side of the push cylinder (11), and the sliding block (16) is slidably installed on the vertical shaft (15). The sliding block (16) is connected with the vertical rod (12).

4. The water soluble granular fertilizer vibrating screening apparatus as claimed in claim 1, wherein, It also includes a plurality of fans (17), and the plurality of fans (17) are respectively installed on the vertical rod (12) through supports. The plurality of fans (17) respectively blow air between the plurality of screen frames (2).

5. The water soluble granular fertilizer vibrating screening apparatus as claimed in claim 1, wherein, It also includes a plurality of gate plates (18) and a plurality of drive rods (19), the plurality of gate plates (18) are respectively located in the front ends of the plurality of screen frames (2), the upper ends of the plurality of gate plates (18) are each provided with a drive rod (19), and the plurality of drive rods (19) are rotatably connected with the front column of the rack (1).

6. The water soluble granular fertilizer vibrating screening apparatus as claimed in claim 5, wherein, It also includes a plurality of lower pull rods (20), a plurality of middle pull rods (21) and a plurality of push rods (22), the plurality of lower pull rods (20) are respectively installed on the plurality of front shafts (9), the plurality of lower pull rods (20) are all towards the rear side of the rack (1), the lower ends of the plurality of middle pull rods (21) are respectively rotatably connected with the rear ends of the plurality of lower pull rods (20), the upper ends of the plurality of middle pull rods (21) are respectively rotatably connected with the lower ends of the plurality of push rods (22), and the upper ends of the plurality of push rods (22) are respectively installed on the plurality of drive rods (19).

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