An integrated device for storing and transporting valve rubber parts

Abstract

The present invention discloses an integrated storage and transportation device for valve rubber parts, which relates to the technical field of valve rubber part storage. The device includes a transport vehicle. Universal wheels are fixedly installed at the four corner positions at the bottom end of the transport vehicle. A fixed frame is fixedly installed on the top surface of the transport vehicle. A column is fixedly connected to the fixed frame. A grip is fixedly connected to the top end of the column. A rubber sleeve is fixedly installed on the grip. A clamp is sleeved on the column. A fixed block is fixedly connected to the clamp. The fixed block is fixedly installed on a placement table through bolts. A limiting groove is formed at the top end of the placement table. Railings are fixedly connected to the top end of the placement table. The structure of the present invention is reasonable, realizing the storage, transportation and use of rubber parts, effectively avoiding the misloading and missing loading of rubber parts, reducing the loss of rubber parts, and improving the production operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of valve rubber part storage, and particularly relates to an integrated device for storing and transporting valve rubber parts. Background Art

[0002] The 120-type freight car air control valve is a core component in the railway freight car braking system. The overhaul of the 120 valve directly affects the reliability of the vehicle braking performance, and further affects the safe operation of railway freight cars. During the overhaul of the 120 valve, it is necessary to replace new rubber parts inside the valve body to ensure the operating performance of the 120 valve.

[0003] The existing storage and use method of 120 valve rubber parts is centralized storage in a rack. According to different specifications and models of rubber parts, they are placed separately in a centralized manner. This form affects the management of 120 valve rubber parts to a certain extent. It is not easy to ensure the "first in, first out, and push out the old and store the new" of rubber parts, resulting in waste of rubber parts. At the same time, it is easy to have the phenomena of missing installation and misinstallation of rubber parts. Another storage and use method of 120 valve rubber parts is to take them in sets according to the number of parts per vehicle, and store them separately at each work station in plastic bags. This form can solve the problem of distributing and using 120 valve rubber parts according to the number of parts per vehicle, and avoid missing installation of parts to a certain extent. However, during the use process, there are problems such as inconvenient access to rubber parts and difficult distinction of specifications and models, which affect the assembly efficiency of the 120 valve and are prone to misinstallation. Therefore, the present application provides an integrated device for storing and transporting valve rubber parts to meet the requirements. Summary of the Invention

[0004] The purpose of the present application is to provide an integrated device for storing and transporting valve rubber parts, which realizes the storage, transfer, and use of rubber parts, effectively avoids misinstallation and missing installation of rubber parts, reduces rubber part loss, and improves production operation efficiency.

[0005] To achieve the above purpose, the present application provides the following technical solution: An integrated device for storing and transporting valve rubber parts, including a transport vehicle. Universal wheels are fixedly installed at the four corner positions at the bottom of the transport vehicle. A fixed frame is fixedly installed on the top surface of the transport vehicle. A column is fixedly connected to the fixed frame. A grip is fixedly connected to the top of the column. A rubber sleeve is fixedly installed on the grip. A clamp is sleeved on the column. A fixed block is fixedly connected to the clamp. The fixed block is fixedly installed on a placement table through bolts. A limit groove is opened at the top of the placement table. A railing is fixedly connected to the top of the placement table. A limit block is opened on one side of the placement table. The limit block fits on the clamp. It further includes a storage component, a limit component, and a support component. The storage component is used to cooperate with valve rubber parts for use. The limit component is used to cooperate with the placement table for use. The support component is used to cooperate with the overall transport vehicle for use.

[0006] Preferably, the storage component includes a first tray placed inside the limit slot. First support legs are fixedly connected to the four corners of the first tray. Corresponding first storage slots are formed on the surface of the first tray. A first label is provided on the transport vehicle.

[0007] Preferably, a second tray is also placed inside the limit slot. Corresponding second storage slots are formed on the surface of the second tray. A second label is provided on the surface of the second tray. Second support legs are fixedly connected to the four corners of the second tray.

[0008] Preferably, the limit component includes main shafts fixedly connected to both sides of the placement table. Pulleys are rotatably connected to the main shafts. A toothed disc is fixedly connected to one side of the pulley.

[0009] Preferably, accommodation grooves are formed on both sides of the placement table. Covers are installed on the accommodation grooves. A shaft pin is fixedly connected to the cover. A limit plate is rotatably connected to the shaft pin. A card slot is formed on the limit plate. A guide groove is formed on the surface of the cover.

[0010] Preferably, a fixed seat is fixedly installed inside the accommodation groove. A sliding rod is slidably inserted into the fixed seat. A disc is fixedly connected to the sliding rod. A first spring is sleeved on one end of the sliding rod. Both ends of the first spring are fixedly connected to one side of the disc and the inner wall of the accommodation groove respectively.

[0011] Preferably, a pull rod is fixedly connected to the sliding rod. One end of the pull rod extends outside the accommodation groove through the guide groove.

[0012] Preferably, a fixed rod is fixedly connected to the other end of the sliding rod. A fixed sleeve is fixedly connected to the fixed rod. A clamping plate is fixedly installed on the fixed sleeve. A clamping block is fixedly connected to the clamping plate. The clamping block is clamped on the toothed disc.

[0013] Preferably, the support component includes steel bars fixedly installed on the transport vehicle. Fixed slots are formed on the steel bars. A support rod is inserted into the steel bar. A handle is fixedly connected to the top end of the support rod. The bottom end of the support rod is movably inserted into the transport vehicle. A clamping rod is fixedly connected to the surface of the support rod.

[0014] Preferably, the bottom end of the support rod is rotatably connected to a bottom plate. Sleeves are fixedly connected to both ends of the bottom plate. A plug rod is movably inserted into the sleeve. The top end of the plug rod is fixedly connected to the bottom end of the transport vehicle. A second spring is sleeved on the sleeve and the plug rod. Both ends of the second spring are fixedly connected to the bottom end of the transport vehicle and the top end of the bottom plate respectively.

[0015] In summary, the technical effects and advantages of the present invention:

[0016] 1. The present invention has a reasonable structure. When the rubber parts need to be placed, a limiting groove is provided on the storage table, and a first tray and a second tray are placed inside the limiting groove respectively. The first legs are fixedly connected to the four corners of the first tray, so that multiple groups of first trays can be stacked to avoid mutual squeezing of the rubber parts between the first trays, which causes the first trays to be uneven as a whole. The first tray and the second tray are provided with a first storage groove and a second storage groove respectively, and rubber parts of different specifications can be stored through the first storage groove and the second storage groove, so that the wrong or missed rubber parts can be prevented when taking them.

[0017] 2. In the present invention, when it is necessary to adjust the spacing between the storage tables to facilitate the placement of multiple groups of rubber parts, the pull rod is pulled. Since the pull rod is fixedly connected to the sliding rod, the sliding rod is moved by pulling the pull rod, and then the limit plate is rotated so that the card slot is clamped on the pull rod to fix the position of the pull rod. A first spring is sleeved on the sliding rod. The first spring is squeezed by the movement of the sliding rod. A fixed rod is fixedly connected to the other end of the sliding rod, and a fixed sleeve is fixedly connected to the fixed rod. A card plate is fixedly connected to the fixed sleeve. The card plate is moved by the movement of the sliding rod. A card block is fixedly connected to the card plate, and the card block is clamped on the toothed disk by the elastic force of the first spring. The card block is separated from the toothed disk by the movement of the card plate, so that the pulley can rotate and slide on the column to adjust the spacing between the storage tables.

[0018] 3. In the present invention, when it is necessary to pick up and carry the rubber parts on the first pallet and the second pallet, the handle is pushed, and the handle is fixedly connected to the support rod. The support rod is moved downward by pushing the handle, and a bottom plate is rotatably connected to the bottom end of the support rod. The bottom plate supports the entire transport vehicle by moving the support rod downward, so that the universal wheel is off the ground. The support rod is then rotated so that the clamping rod is clamped in the fixing groove, thereby facilitating the fixing of the bottom plate. When the transport vehicle needs to be moved, the fixing groove is rotated to disengage the clamping rod from the fixing groove, and the elastic force of the second spring is used to reset the position of the bottom plate, so that the universal wheel is attached to the ground and the transport vehicle is moved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the transport vehicle;

[0021] Figure 2 It is a schematic perspective view of the side view of the transport vehicle;

[0022] Figure 3 It is a schematic perspective view of the bottom view of the transport vehicle;

[0023] Figure 4 It is a schematic perspective view of the first tray and the second tray;

[0024] Figure 5 It is a schematic perspective view of the storage table;

[0025] Figure 6 It is a schematic perspective view of the railing;

[0026] Figure 7 It is a schematic perspective view of the steel bar;

[0027] Figure 8 It is Figure 5 the enlarged structural schematic diagram of the position A in

[0028] Figure 9 It is Figure 6 the enlarged structural schematic diagram of the position B in

[0029] In the figure: 1. Transport vehicle; 101. Universal wheel; 102. Fixed frame; 103. Column; 104. Handle; 105. Rubber sleeve; 106. Clamp; 107. Fixed block; 108. Storage table; 109. Limit groove; 110. Railing; 112. Limit block; 2. First tray; 201. First foot; 202. First storage groove; 203. First label; 204. Second tray; 205. Second storage groove; 206. Second label; 207. Second foot; 3. Main shaft; 301. Pulley; 302. Tooth disc; 303. Accommodation groove; 304. Cover plate; 305. Axle pin; 306. Limit plate; 307. Card slot; 308. Guide groove; 4. Fixed seat; 401. Slide bar; 402. Disc; 403. First spring; 404. Pull rod; 405. Fixed rod; 406. Fixed sleeve; 407. Card plate; 408. Card block; 5. Steel bar; 501. Fixed groove; 502. Support rod; 503. Handle; 504. Card rod; 505. Bottom plate; 506. Sleeve; 507. Insert rod; 508. Second spring. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Example: Refer to Figures 1-3 An integrated device for storing and transporting valve rubber parts as shown, which includes a transport vehicle 1. Universal wheels 101 are fixedly installed at the four corner positions of the bottom end of the transport vehicle 1. A fixing frame 102 is fixedly installed on the top surface of the transport vehicle 1. A column 103 is fixedly connected to the fixing frame 102. A grip 104 is fixedly connected to the top end of the column 103. A rubber sleeve 105 is fixedly installed on the grip 104. A clamp 106 is sleeved on the column 103. A fixing block 107 is fixedly connected to the clamp 106. The fixing block 107 is fixedly installed on a placement table 108 by bolts. A limiting groove 109 is opened at the top end of the placement table 108. A railing 110 is fixedly connected to the top end of the placement table 108. A limiting block 112 is opened on one side of the placement table 108. The limiting block 112 is attached to the clamp 106; it further includes a storage component, a limiting component, and a support component. The storage component is used to cooperate with the valve rubber parts for use. The limiting component is used to cooperate with the placement table 108 for use. The support component is used to cooperate with the entire transport vehicle 1 for use.

[0032] Specifically, when placing the rubber parts, a first tray 2 and a second tray 204 are respectively arranged inside the limiting groove 109. A first placement groove 202 and a second placement groove 205 are respectively opened on the first tray 2 and the second tray 204, so that rubber parts of different specifications can be stored correspondingly, avoiding the situation of mis-taking and missing-taking. Then, the first tray 2 and the second tray 204 are transported as a whole by the transport vehicle 1. The support component can stably support the entire transport vehicle 1.

[0033] As an implementation method in this embodiment, according to the attached Figure 4 、 5 As shown in FIGS. 5 and 6, the storage component includes a first tray 2 placed inside the limiting groove 109. First support feet 201 are fixedly connected to the four corner positions of the first tray 2. A corresponding first placement groove 202 is opened on the surface of the first tray 2. A first label 203 is arranged on the transport vehicle 1. A second tray 204 is also placed inside the limiting groove 109. A corresponding second placement groove 205 is opened on the surface of the second tray 204. A second label 206 is arranged on the surface of the second tray 204. Second support feet 207 are fixedly connected to the four corner positions of the second tray 204.

[0034] Specifically, when it is necessary to place rubber parts, a limiting groove 109 is provided on the storage table 108. A first tray 2 and a second tray 204 are respectively placed inside the limiting groove 109. First support feet 201 are fixedly connected to the four corners of the first tray 2, which facilitates stacking of multiple groups of first trays 2 and prevents the rubber parts between the first trays 2 from being squeezed against each other, causing unevenness of the entire first tray 2. First storage grooves 202 and second storage grooves 205 are respectively provided on the first tray 2 and the second tray 204. Different specifications of rubber parts can be stored through the first storage grooves 202 and the second storage grooves 205, preventing misappropriation and omission during taking.

[0035] As an implementation manner in this embodiment, according to the attached Figure 7 and 8 As shown, the limiting component includes a main shaft 3 fixedly connected to both sides of the storage table 108. A pulley 301 is rotatably connected to the main shaft 3. A toothed disc 302 is fixedly connected to one side of the pulley 301. Accommodation grooves 303 are provided on both sides of the storage table 108. A cover plate 304 is installed on the accommodation grooves 303. A shaft pin 305 is fixedly connected to the cover plate 304. A limiting plate 306 is rotatably connected to the shaft pin 305. A clamping groove 307 is provided on the limiting plate 306. A guiding groove 308 is provided on the surface of the cover plate 304. A fixing seat 4 is fixedly installed inside the accommodation groove 303. A sliding rod 401 is slidably inserted into the fixing seat 4. A disc 402 is fixedly connected to the sliding rod 401. A first spring 403 is sleeved on one end of the sliding rod 401. The two ends of the first spring 403 are respectively fixedly connected to one side of the disc 402 and the inner wall of the accommodation groove 303. A pull rod 404 is fixedly connected to the sliding rod 401. One end of the pull rod 404 extends outside the accommodation groove 303 through the guiding groove 308. A fixing rod 405 is fixedly connected to the other end of the sliding rod 401. A fixing sleeve 406 is fixedly connected to the fixing rod 405. A clamping plate 407 is fixedly installed on the fixing sleeve 406. A clamping block 408 is fixedly connected to the clamping plate 407. The clamping block 408 is clamped on the toothed disc 302.

[0036] Specifically, when it is necessary to adjust the distance between the storage platforms 108 to facilitate the placement of multiple rubber parts, the pull rod 404 is pulled. Since the pull rod 404 is fixedly connected to the slide rod 401, the slide rod 401 is driven to move by pulling the pull rod 404. Then, the limiting plate 306 is rotated so that the card slot 307 is clamped on the pull rod 404 to fix the position of the pull rod 404. A first spring 403 is sleeved on the slide rod 401. The slide rod 401 moves to make the disc 402 squeeze the first spring 403. A fixing rod 405 is fixedly connected to the other end of the slide rod 401, and a fixing sleeve 406 is fixedly connected to the fixing rod 405. A clamping plate 407 is fixedly connected to the fixing sleeve 406. The movement of the slide rod 401 drives the clamping plate 407 to move. A clamping block 408 is fixedly connected to the clamping plate 407, and the clamping block 408 is clamped on the gear disc 302 by the elastic force of the first spring 403. The movement of the clamping plate 407 makes the clamping block 408 disengage from the gear disc 302, so as to facilitate the pulley 301 to rotate and slide on the column 103 and adjust the distance between the storage platforms 108.

[0037] As an implementation manner in this embodiment, according to the attached Figure 9 As shown, the support assembly includes a steel bar 5 fixedly installed on the transport vehicle 1. A fixing groove 501 is formed in the steel bar 5. A support rod 502 is inserted into the inside of the steel bar 5. The top end of the support rod 502 is fixedly connected to a handle 503. The bottom end of the support rod 502 is movably inserted into the transport vehicle 1. A clamping rod 504 is fixedly connected to the surface of the support rod 502. The bottom end of the support rod 502 is rotatably connected to a bottom plate 505. Two ends of the bottom plate 505 are fixedly connected to a sleeve 506. A plug rod 507 is movably inserted into the inside of the sleeve 506. The top end of the plug rod 507 is fixedly connected to the bottom end of the transport vehicle 1. A second spring 508 is sleeved on the sleeve 506 and the plug rod 507. Two ends of the second spring 508 are respectively fixedly connected to the bottom end of the transport vehicle 1 and the top end of the bottom plate 505.

[0038] Specifically, when it is necessary to take and transport the rubber parts on the first tray 2 and the second tray 204, the handle 503 is pushed. Since the handle 503 is fixedly connected to the support rod 502, the support rod 502 is driven to move downward by pushing the handle 503. The bottom end of the support rod 502 is rotatably connected to the bottom plate 505. The downward movement of the support rod 502 makes the bottom plate 505 support the whole transport vehicle 1, so that the universal wheels 101 are separated from the ground. Then, the support rod 502 is rotated to make the clamping rod 504 clamped in the fixing groove 501, so as to facilitate the fixation of the position of the bottom plate 505. When it is necessary to move the transport vehicle 1, the fixing groove 501 is rotated to make the clamping rod 504 disengage from the fixing groove 501. The elastic force of the second spring 508 facilitates the reset of the position of the bottom plate 505, so that the universal wheels 101 are attached to the ground and the transport vehicle 1 is moved.

[0039] Working principle of the present invention: When it is necessary to place rubber parts, a limiting groove 109 is provided on the placing table 108. A first tray 2 and a second tray 204 are respectively placed inside the limiting groove 109. First support feet 201 are fixedly connected to the four corners of the first tray 2, which is convenient for stacking multiple groups of first trays 2 to prevent the rubber parts between the first trays 2 from being squeezed against each other, causing the overall unevenness of the first tray 2. First placing grooves 202 and second placing grooves 205 are respectively provided on the first tray 2 and the second tray 204. Different specifications of rubber parts can be stored through the first placing grooves 202 and the second placing grooves 205, preventing mis-taking or missing-taking when taking and placing.

[0040] When it is necessary to adjust the distance between the placing tables 108 to facilitate the placement of multiple groups of rubber parts, the pull rod 404 is pulled. Since the pull rod 404 is fixedly connected to the sliding rod 401, the sliding rod 401 is driven to move by pulling the pull rod 404. Then, the limiting plate 306 is rotated so that the clamping groove 307 is clamped on the pull rod 404 to fix the position of the pull rod 404. A first spring 403 is sleeved on the sliding rod 401. The disc 402 squeezes the first spring 403 by the movement of the sliding rod 401. A fixing rod 405 is fixedly connected to the other end of the sliding rod 401, and a fixing sleeve 406 is fixedly connected to the fixing rod 405. A clamping plate 407 is fixedly connected to the fixing sleeve 406. The clamping plate 407 is driven to move by the movement of the sliding rod 401. A clamping block 408 is fixedly connected to the clamping plate 407, and the clamping block 408 is clamped on the toothed disc 302 by the elastic force of the first spring 403. The clamping block 408 is disengaged from the toothed disc 302 by the movement of the clamping plate 407, so that the pulley 301 can rotate and slide on the column 103 to adjust the distance between the placing tables 108.

[0041] When it is necessary to take and transport the rubber parts on the first tray 2 and the second tray 204, the handle 503 is pushed. The handle 503 is fixedly connected to the support rod 502. The support rod 502 is driven to move downward by pushing the handle 503. A bottom plate 505 is rotatably connected to the bottom end of the support rod 502. The bottom plate 505 supports the entire transport vehicle 1 by moving downward the support rod 502, so that the universal wheels 101 are separated from the ground. Then, the support rod 502 is rotated so that the clamping rod 504 is clamped in the fixing groove 501, thereby facilitating the fixing of the position of the bottom plate 505. When it is necessary to move the transport vehicle 1, the fixing groove 501 is rotated to disengage the clamping rod 504 from the fixing groove 501. The elastic force of the second spring 508 facilitates the resetting of the position of the bottom plate 505, facilitating the universal wheels 101 to fit on the ground to move the transport vehicle 1.

[0042] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated storage and transportation device for valve rubber parts, including a transport vehicle (1), characterized in that, Four universal wheels (101) are fixedly installed at the four corner positions of the bottom end of the transport vehicle (1). A fixed frame (102) is fixedly installed on the top surface of the transport vehicle (1). A column body (103) is fixedly connected to the fixed frame (102). A grip (104) is fixedly connected to the top end of the column body (103). A rubber sleeve (105) is fixedly installed on the grip (104). A clamp (106) is sleeved on the column body (103). A fixed block (107) is fixedly connected to the clamp (106). The fixed block (107) is fixedly installed on the storage table (108) by bolts. A limiting groove (109) is opened at the top end of the storage table (108). A railing (110) is fixedly connected to the top end of the storage table (108). A limiting block (112) is opened on one side of the storage table (108). The limiting block (112) is attached to the clamp (106); It further includes a storage component, a limiting component and a support component. The storage component is used for cooperating with the valve rubber part. The limiting component is used for cooperating with the storage table (108). The support component is used for cooperating with the whole transport vehicle (1); The storage component includes a first tray (2) placed inside the limiting groove (109). First support feet (201) are fixedly connected to the four corner positions of the first tray (2). Corresponding first storage grooves (202) are opened on the surface of the first tray (2). A first label (203) is arranged on the transport vehicle (1); The limiting component includes a main shaft (3) fixedly connected to both sides of the placement table (108). A pulley (301) is rotatably connected to the main shaft (3), and a gear disc (302) is fixedly connected to one side of the pulley (301); accommodating grooves (303) are formed on both sides of the placement table (108), a cover plate (304) is installed on the accommodating grooves (303), a shaft pin (305) is fixedly connected to the cover plate (304), a limiting plate (306) is rotatably connected to the shaft pin (305), a clamping groove (307) is formed on the limiting plate (306), and a guiding groove (308) is formed on the surface of the cover plate (304); a fixed seat (4) is fixedly installed inside the accommodating groove (303), a sliding rod (401) is slidably inserted into the fixed seat (4), a disc (402) is fixedly connected to the sliding rod (401), one end of the sliding rod (401) is sleeved with a first spring (403), and both ends of the first spring (403) are fixedly connected to one side of the disc (402) and the inner wall of the accommodating groove (303) respectively; a pull rod (404) is fixedly connected to the sliding rod (401), and one end of the pull rod (404) extends outside the accommodating groove (303) through the guiding groove (308); a fixed rod (405) is fixedly connected to the other end of the sliding rod (401), a fixed sleeve (406) is fixedly connected to the fixed rod (405), a clamping plate (407) is fixedly installed on the fixed sleeve (406), a clamping block (408) is fixedly connected to the clamping plate (407), and the clamping block (408) is clamped on the gear disc (302).

2. The integrated storage and transportation device for valve rubber parts according to claim 1, wherein: A second tray (204) is also placed inside the limiting groove (109). Corresponding second placement grooves (205) are formed on the surface of the second tray (204), a second label (206) is arranged on the surface of the second tray (204), and second support feet (207) are fixedly connected to the four corners of the second tray (204).

3. The integrated storage and transportation device for valve rubber parts according to claim 1, characterized in that: The support component includes a steel bar (5) fixedly installed on the transport vehicle (1). A fixed groove (501) is formed on the steel bar (5), a support rod (502) is inserted into the steel bar (5), a handle (503) is fixedly connected to the top end of the support rod (502), the bottom end of the support rod (502) is movably inserted into the transport vehicle (1), and a clamping rod (504) is fixedly connected to the surface of the support rod (502).

4. The integrated device for storing and transporting valve rubber parts according to claim 3, wherein: The bottom end of the support rod (502) is rotatably connected to a bottom plate (505). Sleeves (506) are fixedly connected to both ends of the bottom plate (505). A plug rod (507) is movably inserted into the sleeves (506), the top end of the plug rod (507) is fixedly connected to the bottom end of the transport vehicle (1), and a second spring (508) is sleeved on the sleeves (506) and the plug rod (507). Both ends of the second spring (508) are fixedly connected to the bottom end of the transport vehicle (1) and the top end of the bottom plate (505) respectively.

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