Backward pushing type goods shelf

Abstract

The utility model belongs to the technical field of goods storage, and discloses a push-back type goods shelf. The push-back type goods shelf comprises a supporting frame, a guide rail, a connecting beam and a plurality of trolleys. Goods storing and taking grids are arranged in the supporting frame. The guide rail is arranged on the supporting frame. The connecting beams are arranged in the goods storing and taking grids; the multiple trolleys are sequentially distributed in the extending direction of the guide rail and slidably connected with the guide rail, the trolleys are used for storing goods and can slide into the goods storing and taking grids, one trolley can be connected with the connecting beam in a clamped mode, and the multiple trolleys can be connected with one another in a clamped mode. When the push-back type goods shelf is used, in the process that goods are carried away from the trolleys, the trolleys and the connecting beams as well as the trolleys are clamped, so that the multiple trolleys can be limited in the supporting frames, the stability of the trolleys in the goods storing and taking lattices is ensured, the possibility that the trolleys are broken away from the supporting frames and consequently the trolleys are damaged is reduced, and the service life of the trolleys is prolonged. And meanwhile, a subsequent trolley can smoothly slide into the goods storing and taking grid, and it is ensured that goods can be rapidly and efficiently carried and taken.

Description

Technical Field

[0001] The utility model relates to the technical field of cargo storage, in particular to a push-back type shelf. Background Art

[0002] As a commonly used frame structure for storing goods in warehouses, the design, size, and material of the push-back rack itself will affect the storage and handling of goods.

[0003] In the prior art, push-back racks are long and have slide rails along their length. Multiple trolleys are slidably connected to the slide rails to carry goods. When removing goods, the trolleys can slide on the slide rails to move goods from the rear of the push-back rack to the front, allowing for forklifts and other equipment to transport the goods.

[0004] However, during the handling process, due to sudden changes in the force on the trolley, the trolley can easily detach from the slide rail or even fall off the slide rail as a whole, which not only easily causes damage to the trolley, but also affects the efficiency of subsequent cargo handling. Utility Model Content

[0005] The purpose of the utility model is to provide a push-back rack, which solves the problem in the prior art that the trolley of the push-back rack is easily detached from the slide rail or even falls off when the goods are moved, causing the trolley to be easily damaged and affecting the efficiency of subsequent moving of goods.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a push-back rack, comprising:

[0008] A support frame having a storage compartment for storing and removing goods;

[0009] A guide rail is provided on the support frame;

[0010] A connecting beam is provided in the storage and retrieval compartment;

[0011] Multiple trolleys are distributed in sequence along the extension direction of the guide rail and are all slidably connected to the guide rail. The trolleys are used to store goods. Multiple trolleys can slide into the storage and retrieval grid. One of the trolleys can be connected to the connecting beam and multiple trolleys can be connected to each other.

[0012] Optionally, the multiple trolleys include a first trolley, a second trolley and a third trolley distributed in sequence along the sliding direction of the trolley. The first trolley has a hook that is plugged into the connecting beam. When the second trolley and the third trolley slide into the storage and retrieval grid, the second trolley and the third trolley are both hooked with the first trolley.

[0013] Optionally, the trolley is provided with a plurality of casters at intervals along the sliding direction, and the guide rails are provided with a plurality of slides at intervals along their width direction. The casters of different trolleys are slidably connected to different slides, so that the casters of the second trolley and the casters of the third trolley can be engaged with the first trolley.

[0014] Optionally, the first trolley has a limiting plate, and when the second trolley and the third trolley slide into the storage and retrieval grid, the casters of the second trolley and the casters of the third trolley are at least partially inserted into the lower side of the limiting plate.

[0015] Optionally, the multiple slides include inner slides and outer slides, the casters of the first trolley are all slidably connected to the inner slides, the casters of the second trolley close to the first trolley are slidably connected to the outer slides, the casters close to the third trolley are slidably connected to the inner slides, and the casters of the third trolley are all slidably connected to the outer slides.

[0016] Optionally, the caster has a limiting groove, and the slide portion is inserted into the limiting groove.

[0017] Optionally, the height of the guide rail gradually increases along its extension direction.

[0018] Optionally, the support frame includes:

[0019] Two supporting assemblies are arranged opposite to each other, and a plurality of cross beams are fixedly connected between the two supporting assemblies. The plurality of cross beams are distributed at intervals along the length of the guide rail.

[0020] Optionally, the support assembly includes a plurality of support units spaced apart along the sliding direction of the trolley, and the plurality of support units are all fixedly connected to the guide rail.

[0021] Optionally, the support unit includes:

[0022] Two columns are arranged opposite to each other, and a plurality of diagonal bracing beams are arranged in sequence between the two columns along the height direction of the columns.

[0023] Beneficial effects of the utility model:

[0024] When placing goods, multiple trolleys slide into the storage and retrieval grid to receive the goods. After receiving the goods, the trolleys slide into the depth of the support frame in turn. When taking out goods, multiple trolleys will drive the goods into the storage and retrieval grid in turn. By setting a connecting beam in the storage and retrieval grid, when the trolley slides into the storage and retrieval grid, it forms a card limit with the connecting beam, and cooperates with the mutual card fixation between multiple trolleys. In the process of taking out goods from the trolley, each trolley can be restricted in the storage and retrieval grid, ensuring that the overall force of the trolley remains balanced and reducing the possibility of displacement. In this way, when the push-back rack is in use, when the goods are moved from the trolley, the trolley and the connecting beam and the trolleys form a card connection, so that multiple trolleys can be restricted in the support frame, ensuring the stability of the trolley in the storage and retrieval grid, reducing the possibility of the trolley being damaged by detaching from the support frame, and also allowing subsequent trolleys to slide smoothly into the storage and retrieval grid, ensuring that the goods can be taken out quickly and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of a push-back shelf in an embodiment of the present utility model;

[0026] Figure 2 This is a side view of a push-back shelf in an embodiment of the present utility model;

[0027] Figure 3 This is a structural cross-sectional view of the casters of the push-back rack in the embodiment of the utility model;

[0028] Figure 4 This is a front view of the first trolley of the push-back rack in the embodiment of the utility model;

[0029] Figure 5 yes Figure 1 An enlarged view of section A in the implementation shown.

[0030] In the picture:

[0031] 1. Support frame; 11. Storage and retrieval grid; 12. Crossbeam; 13. Support unit; 131. Column; 132. Diagonal bracing beam;

[0032] 2. Guide rail; 21. Inner slideway; 22. Outer slideway;

[0033] 3. Connecting beam;

[0034] 4. First car; 41. Hook; 42. Limit plate;

[0035] 5. The second car;

[0036] 6. The third car;

[0037] 7. Caster; 71. Connecting frame; 72. Connecting rod; 73. Bushing; 74. Bearing; 75. Limiting groove. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0039] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] The utility model provides a push-back type shelf.

[0043] Reference Figures 1 to 3The push-back rack includes a support frame 1, guide rails 2, connecting beams 3, and multiple trolleys. The support frame 1 has a storage and retrieval compartment 11 for storing and retrieving goods. The guide rails 2 are mounted on the support frame 1. The connecting beams 3 are mounted within the storage and retrieval compartment 11. Multiple trolleys are arranged in sequence along the extension of the guide rails 2 and are all slidably connected to the guide rails 2. The trolleys are used to store goods and can slide into the storage and retrieval compartment 11. One of the trolleys can be engaged with the connecting beams 3, and multiple trolleys can be engaged with each other.

[0044] Specifically, the support frame 1 is in the shape of an elongated strip, and the space at the front end thereof serves as a storage and retrieval compartment 11. A forklift can carry goods into the storage and retrieval compartment 11, and can also take goods out of the storage and retrieval compartment 11. In the space other than the storage and retrieval compartment 11 in the support frame 1, a plurality of trolleys are sequentially distributed. The trolleys slide in conjunction with the guide rails 2, and the plurality of trolleys can slide into the storage and retrieval compartment 11. Two or one guide rails 2 can be provided. Along the length direction of the guide rails 2 and away from the storage and retrieval compartment 11, the heights of the plurality of trolleys increase sequentially. Among the two adjacent trolleys, the top wall of the trolley close to the storage and retrieval compartment 11 is slightly lower than the bottom wall of the other trolley, so that the plurality of trolleys can overlap in the storage and retrieval compartment 11.

[0045] A connecting beam 3 is provided in the storage and retrieval compartment 11. The connecting beam 3 can extend along the length direction of the support frame 1. On the one hand, it can enhance the strength of the storage and retrieval compartment 11, thereby improving the carrying capacity of the goods in the storage and retrieval compartment 11. On the other hand, it can be connected with one of the trolleys to confine the trolley in the support frame 1. Multiple trolleys can also be connected with each other, so that all trolleys are confined inside the support frame 1. The connection between the trolley and the connecting beam 3 can be achieved by a hook or a plug-in rod, that is, when the trolley slides into the storage and retrieval compartment 11, the hook and the plug-in rod form a plug-in fit with the connecting beam 3, so that the two are connected. The connection between multiple trolleys can be achieved by the plug-in fit of the local structure between two adjacent trolleys, or the trolleys that are connected with the connecting beam 3 among the multiple trolleys can be connected with the remaining trolleys. The specific design can be based on the actual installation scenario.

[0046] When placing goods, multiple trolleys slide into the storage and retrieval compartment 11 to receive the goods. After receiving the goods, the trolleys slide into the deep of the support frame 1 in turn. When taking goods out, multiple trolleys will drive the goods into the storage and retrieval compartment 11 in turn. By setting a connecting beam 3 in the storage and retrieval compartment 11, when the trolley slides into the storage and retrieval compartment 11, it forms a card limit with the connecting beam 3, and cooperates with the mutual card fixation between multiple trolleys. In the process of removing goods from the trolley, each trolley can be restricted in the storage and retrieval compartment 11, ensuring that the overall force of the trolley remains balanced and reducing the possibility of displacement. In this way, when the push-back rack is in use, during the process of moving goods from the trolley, a card connection is formed between the trolley and the connecting beam 3 and between the trolleys, so that multiple trolleys can be confined in the support frame 1, ensuring the stability of the trolleys in the storage and retrieval compartment 11, reducing the damage to the trolley caused by the trolley detaching from the support frame 1, and also ensuring that subsequent trolleys can slide smoothly into the storage and retrieval compartment 11, ensuring that the goods can be moved quickly and efficiently.

[0047] Optionally, the multiple trolleys include a first trolley 4, a second trolley 5 and a third trolley 6 distributed in sequence along the sliding direction of the trolley. The first trolley 4 has a hook 41 that is plugged into and cooperates with the connecting beam 3. When the second trolley 5 and the third trolley 6 slide into the storage and retrieval grid 11, the second trolley 5 and the third trolley 6 are both engaged with the first trolley 4.

[0048] Specifically, the connecting beam 3 can be a P-shaped beam, and the hook 41 is L-shaped, with its top wall fixed to the bottom wall of the first trolley 4, and the fixing method can be welding or bolt connection, etc., and the cross arm of the hook can be hooked with the P-shaped beam. Part of the structure of the first trolley 4 is convex. When the second trolley 5 slides into the storage and retrieval grid 11, the second trolley 5 is at least partially inserted into the lower side of the protruding part of the first trolley 4, so that the second trolley 5 and the first trolley 4 can form a snap-fit ​​fit. For example, the second trolley 5 is slidably connected to the support frame 1 through rollers, and part of the roller can be inserted into the lower side of the protruding part of the first trolley 4 to form a snap-fit. A separate snap-fit ​​structure can also be set on the second trolley 5 to form a snap-fit ​​fit with the first trolley 4. Similarly, the way the third trolley 6 cooperates with the first trolley 4 is similar to the above-mentioned method, and the present utility model will not be described here.

[0049] When the first trolley 4 slides into the storage and retrieval compartment 11, the hook can be connected with the connecting beam 3, thereby restricting the first trolley 4 in the support frame 1. When the second trolley 5 and the third trolley 6 slide into the storage and retrieval compartment 11 in turn, the second trolley 5 and the third trolley 6 are connected with the first trolley 4, thereby simultaneously restricting the second trolley 5 and the third trolley 6 in the support frame 1.

[0050] Reference Figure 3 and Figure 4Optionally, the trolley is provided with multiple casters 7 at intervals along the sliding direction, and the guide rails 2 are provided with multiple slides at intervals along their width direction. The casters 7 of different trolleys are slidably connected to different slides, so that the casters 7 of the second trolley 5 and the casters 7 of the third trolley 6 can be engaged with the first trolley 4.

[0051] Specifically, the trolley is cube-shaped. In this embodiment, its horizontal projection is a rectangular parallelepiped. Four connecting brackets 71 are fixed to the bottom wall of the trolley, and the fixing methods can be welding, bonding, or bolting. The four connecting brackets 71 are spaced apart in two groups along the length of the trolley. The connecting brackets 71 are fixedly connected to a connecting rod 72 via bolts. The end of the connecting rod 72 is mounted with a shaft sleeve 73. The outer side of the shaft sleeve 73 is mounted with a bearing 74. The outer side of the bearing 74 is mounted with the caster 7.

[0052] Two guide rails 2 are arranged opposite to each other inside the support frame 1, and multiple slides are distributed at intervals on the top wall of each guide rail 2. The casters 7 of different trolleys are connected to different slides. For example, the casters 7 of the first trolley 4 are slidably connected to the slide located on the innermost side of the guide rail 2, the casters 7 of the second trolley 5 are located on the slide in the middle of the guide rail 2, and the casters 7 of the third trolley 6 are located on the outermost slide of the guide rail 2. In this way, when the first trolley 4, the second trolley 5 and the third trolley 6 are all located in the storage and retrieval grid 11, the casters 7 of the three trolleys can be arranged in parallel. At this time, an L-shaped protruding structure is provided on the front side of the first trolley 4, one side of which is fixedly connected to the first trolley 4, and the other side extends out of the first trolley 4 and is located above the remaining two slides, so that the casters 7 of the second trolley 5 and the third trolley 6 can slide into the protruding structure to form a snap connection. It should be understood that the coordination between the casters 7 of the multiple trolleys and the multiple slides can be designed according to the actual installation scenario, and the position limiting members can be adjusted accordingly to ensure that the multiple trolleys can be connected.

[0053] By arranging multiple casters 7 at intervals along the sliding direction of the trolley, the trolley as a whole can ensure uniform force when sliding within the support frame 1, thereby ensuring that the trolley can remain stable both when carrying goods and sliding. By slidingly connecting the casters 7 of different trolleys to different slideways, the casters 7 of multiple trolleys can be close to each other when sliding into the storage and retrieval compartment 11, thereby ensuring that the casters 7 of the second trolley 5 and the third trolley 6 can form a snap connection with the first trolley 4.

[0054] Optionally, the first trolley 4 has a limiting plate 42 , and when the second trolley 5 and the third trolley 6 slide into the storage and retrieval grid 11 , the casters 7 of the second trolley 5 and the casters 7 of the third trolley 6 are at least partially inserted into the lower side of the limiting plate 42 .

[0055] Specifically, the first trolley 4 has a frame structure, and steel plates are arranged inside to carry goods. An L-shaped limiting plate 42 is arranged on the side wall of the first trolley 4 in a direction parallel to the guide rail 2. The limiting plate 42 covers the guide rail 2 so that the casters 7 of the second trolley 5 and the casters 7 of the third trolley 6 can be inserted into the lower side of the limiting plate 42.

[0056] By using the structure of the first trolley 4 itself as the limiting plate 42, when the casters 7 of the second trolley 5 and the casters 7 of the third trolley 6 are inserted under the limiting plate 42, the bottom wall of the limiting plate 42 can abut against the casters 7, thereby limiting the upward movement of the second trolley 5 and the third trolley 6, and smoothly confining the second trolley 5 and the third trolley 6 within the support frame 1. In this way, a simple structure can be used to achieve the clamping and fixing of multiple trolleys, effectively simplifying the overall structure while ensuring a good clamping effect between the multiple trolleys.

[0057] Reference Figure 5 Optionally, the multiple slides include an inner slide 21 and an outer slide 22, the casters 7 of the first trolley 4 are all slidably connected to the inner slide 21, the casters 7 of the second trolley 5 close to the first trolley 4 are slidably connected to the outer slide 22, the casters 7 close to the third trolley 6 are slidably connected to the inner slide 21, and the casters 7 of the third trolley 6 are all slidably connected to the outer slide 22.

[0058] Specifically, the width of the first trolley 4 is equal to the distance between the inner slides 21 of the two guide rails 2. A caster 7 is set on the bottom wall of the first trolley 4 through a connecting frame 71, and the caster 7 is slidably connected to the inner slide 21. The width of the second trolley 5 and the third trolley 6 is equal to the distance between the outer slides 22 of the two guide rails 2. The side of the trolley close to the storage and retrieval grid 11 is set as the front side, and the other side is set as the rear side. The caster 7 on the front side of the second trolley 5 is set on the side wall of the second trolley 5 through the connecting frame 71, and the caster 7 on the rear side of the second trolley 5 is set on the bottom wall of the second trolley 5 through the connecting frame 71, so that the front caster 7 of the second trolley 5 is slidably connected to the outer slide 22, and the rear caster 7 is slidably connected to the inner slide 21. The casters 7 of the third trolley 6 are all set on the side walls of the third trolley 6 through the connecting frame 71, so that the casters 7 of the third trolley 6 are all slidably connected to the outer slide 22.

[0059] By staggering the casters 7 of the three trolleys on two slides, when all three trolleys slide into the storage and retrieval compartment 11, the front casters 7 of the second trolley 5 and the front casters 7 of the first trolley 4 can be arranged side by side on the outer slide 22 and the inner slide 21 respectively, and the rear casters 7 of the second trolley 5 and the rear casters 7 of the first trolley 4 can be distributed front and back along the length direction of the slide, and the front casters 7 of the third trolley 6 and the front casters 7 of the second trolley 5 are distributed front and back and are at the lower side of the limit plate 42 at the same time, and the rear casters 7 of the third trolley 6 can at least partially correspond to the rear casters 7 of the first trolley 4 and are also located at the lower side of the limit plate 42. In this way, only two slides need to be provided on the guide rail 2 to achieve the overlapping of the three trolleys in the storage and retrieval compartment 11, which effectively reduces the width of the track and reduces the difficulty of track processing.

[0060] Optionally, the caster 7 has a limiting groove 75 (see Figure 3 ), the slide portion is inserted into the limiting groove 75.

[0061] Specifically, the outer surface of the caster 7 is provided with a limiting groove 75, and the middle part of the track along the width direction is concave so that two slides are formed on both sides of the track. The upper side of the slide can be inserted into the limiting groove 75. On the one hand, the caster 7 can form a sliding fit with the slide, and on the other hand, the side wall of the limiting groove 75 can be fitted with the side wall of the slide to form a limit, so as to ensure that the caster 7 will not produce directional deviation during movement.

[0062] Optionally, the height of the guide rail 2 gradually increases along its extension direction.

[0063] Specifically, the height of the guide rail 2 gradually increases, so that multiple guide rails 2 are arranged in an inclined manner from close to the storage and retrieval compartment 11 to away from the storage and retrieval compartment 11. Then, the trolley that is far away from the storage and retrieval compartment 11 can slide toward the storage and retrieval compartment 11 by relying on its own weight. Therefore, when moving goods, there is no need to set up a separate driving structure for the trolley to drive multiple trolleys to slide into the storage and retrieval compartment 11 in sequence.

[0064] Optionally, the support frame 1 includes two support assemblies disposed opposite to each other. A plurality of cross beams 12 are fixedly connected between the two support assemblies, and the plurality of cross beams 12 are distributed at intervals along the length of the guide rail 2 .

[0065] Specifically, the support assemblies are arranged according to the actual length of the storage space, with a guide rail 2 provided on opposing sides of each support assembly. Multiple crossbeams 12 are positioned between the two support assemblies, with their ends fixedly connected to the support assemblies via hooks, thereby securing the two support assemblies together. A connecting beam 3 is fixed to the crossbeams 12 within the storage and retrieval compartment 11, located in the middle of the crossbeams 12. The connecting beam 3 can be secured by welding, bonding, or bolting.

[0066] Optionally, the support assembly includes a plurality of support units 13 spaced apart along the sliding direction of the trolley, and the plurality of support units 13 are all fixedly connected to the guide rail 2 .

[0067] Specifically, the length of the support assembly can be adjusted by adjusting the number of support units 13 and the spacing between two adjacent support units 13, so that the length of the support assembly can be flexibly adjusted according to the size of the actual application scenario, thereby effectively improving the adaptability of the support assembly. The multiple support units 13 are fixedly connected to the guide rail 2 to ensure better overall stability of the guide rail 2.

[0068] Optionally, the support unit 13 includes two oppositely arranged columns 131 , and a plurality of diagonal bracing beams 132 are sequentially arranged between the two columns 131 along the height direction of the columns 131 .

[0069] Specifically, the columns 131 are fixed on the bottom surface, and multiple diagonal bracing beams 132 extending along a 45° angle are arranged between the two columns 131. The multiple diagonal bracing beams 132 are connected end to end to fix the two columns 131 together. The height of the columns 131 can be designed according to the actual height of the goods to be stored and the height of the space, and the present invention does not limit this.

[0070] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Push-back rack, characterized by: include: A support frame (1), wherein the support frame (1) has a storage and retrieval compartment (11) for storing and removing goods; A guide rail (2) is arranged on the support frame (1); A connecting beam (3) is arranged in the storage and retrieval compartment (11); A plurality of trolleys are sequentially distributed along the extension direction of the guide rail (2) and are all slidably connected to the guide rail (2). The trolleys are used to store goods. The plurality of trolleys can slide into the storage and retrieval compartment (11). One of the trolleys can be engaged with the connecting beam (3), and the plurality of trolleys can be engaged with each other.

2. The push-back rack according to claim 1, characterized in that: The plurality of trolleys include a first trolley (4), a second trolley (5) and a third trolley (6) sequentially distributed along the sliding direction of the trolleys. The first trolley (4) has a hook (41) that is plugged into the connecting beam (3). When the second trolley (5) and the third trolley (6) slide into the storage and retrieval compartment (11), the second trolley (5) and the third trolley (6) are both plugged into the first trolley (4).

3. The push-back rack according to claim 2, characterized in that: The trolley is provided with a plurality of casters (7) at intervals along the sliding direction, and the guide rails (2) are provided with a plurality of slideways at intervals along the width direction thereof. The casters (7) of different trolleys are slidably connected to different slideways, so that the casters (7) of the second trolley (5) and the casters (7) of the third trolley (6) can be engaged with the first trolley (4).

4. The push-back rack according to claim 3, characterized in that: The first trolley (4) has a limiting plate (42). When the second trolley (5) and the third trolley (6) slide into the storage and retrieval compartment (11), the casters (7) of the second trolley (5) and the casters (7) of the third trolley (6) are at least partially inserted into the lower side of the limiting plate (42).

5. The push-back rack according to claim 3, characterized in that: The plurality of slides include an inner slide (21) and an outer slide (22), the casters (7) of the first trolley (4) are all slidably connected to the inner slide (21), the casters (7) of the second trolley (5) close to the first trolley (4) are slidably connected to the outer slide (22), the casters (7) close to the third trolley (6) are slidably connected to the inner slide (21), and the casters (7) of the third trolley (6) are all slidably connected to the outer slide (22).

6. The push-back rack according to claim 3, characterized in that: The caster (7) has a limiting groove (75), and the slide portion is inserted into the limiting groove (75).

7. The push-back rack according to any one of claims 1 to 6, characterized in that: The height of the guide rail (2) gradually increases along its extension direction.

8. The push-back rack according to any one of claims 1 to 6, characterized in that: The support frame (1) comprises: Two supporting assemblies are arranged opposite to each other, and a plurality of cross beams (12) are fixedly connected between the two supporting assemblies. The plurality of cross beams (12) are distributed at intervals along the length direction of the guide rail (2).

9. The push-back rack according to claim 8, characterized in that: The support assembly comprises a plurality of support units (13) spaced apart and distributed along the sliding direction of the trolley, and the plurality of support units (13) are all fixedly connected to the guide rail (2).

10. The push-back rack according to claim 9, characterized in that: The support unit (13) comprises: Two columns (131) are arranged opposite to each other, and a plurality of diagonal bracing beams (132) are sequentially arranged between the two columns (131) along the height direction of the columns (131).

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