Sliding door for loft goods shelf
By designing left and right sliding doors that move left and right in combination with guides, the problems of low space utilization and safety hazards in mezzanine shelving were solved, achieving flexible cargo passage management and enhanced security.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN LUCKYROC STORAGE EQUIP MFG CO LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-05-12
AI Technical Summary
Existing mezzanine shelving designs with sliding doors have low space utilization and safety hazards, making them particularly unsuitable for use in confined external spaces.
The system employs left and right sliding doors that can move left and right, combined with guide components and latching assemblies, to flexibly block or open the cargo passage, and enhances stability and security through a latch structure. The guide components and latching assemblies ensure smooth door movement and locking when the doors collide.
It improves the space utilization of mezzanine shelves, enhances safety and applicability, avoids the space encroachment of inward-swinging doors and the collision risk of outward-swinging doors, and is suitable for narrow spaces.
Smart Images
Figure CN224228526U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of warehouse racking technology, and more specifically, to a sliding door for mezzanine racking. Background Technology
[0002] Mezzanine racking is a simple racking system that creates an intermediate mezzanine within an existing workspace or shelving unit to fully utilize the upper space of a warehouse. It transforms a single storage level into multi-level storage, significantly improving space utilization. Mezzanine racking includes aisles for goods to enter and exit. To prevent goods from accidentally falling through these aisles while stored, existing technology discloses a sliding door connected by hinges on the mezzanine racking. Specifically, the sliding door can be opened or closed by pushing or pulling, simultaneously meeting the needs of convenient loading and safe storage.
[0003] However, when sliding doors adopt an inward-swivel design, they will occupy the cargo passage or the storage space in the mezzanine rack, resulting in a decrease in the space utilization rate of the mezzanine rack. When sliding doors adopt an outward-swivel design, they may collide with other equipment or operators, posing a safety hazard, and are difficult to apply in scenarios with narrow external spaces. Utility Model Content
[0004] The purpose of this utility model is to provide a sliding door for mezzanine shelves, which solves the technical problems of how to improve the space utilization rate of mezzanine shelves and how to enhance the safety and applicability of the sliding door.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.
[0006] This utility model provides a sliding door for a mezzanine shelf, used to cover or open the goods passage of the mezzanine shelf. The mezzanine shelf includes a floor slab suspended above the ground and columns erected on the front side of the floor slab. Several columns are spaced apart along the left-right direction, with the two central columns being a first column and a second column, forming the goods passage between them. The door assembly includes a left sliding door and a right sliding door movably mounted on the floor slab. The left sliding door is used to partially cover or partially open the goods passage from the left side. The right sliding door is used to partially block or partially open the cargo passage from the right side, and the left sliding door can completely block the cargo passage when it abuts against the right sliding door; the positioning component includes a first guide and a second guide, the first guide being connected to the first column and used to guide and cooperate with the left sliding door and prevent the left sliding door from disengaging from the first guide from the left and right sides, and the second guide being connected to the second column and used to guide and cooperate with the right sliding door and prevent the left sliding door from disengaging from the second guide from the left and right sides.
[0007] In some embodiments of this application, both the left and right sliding doors include a left vertical tube, a right vertical tube, and a horizontal tube connected to the left and right vertical tubes respectively; both the first guide member and the second guide member have guide grooves that extend through the left and right sides, and a first stop plate and a second stop plate are respectively provided on them. The guide groove of the first guide member is slidably connected to the horizontal tube of the left sliding door, and the guide groove of the second guide member is slidably connected to the horizontal tube of the right sliding door. The first stop plate is located between the left and right vertical tubes of the left sliding door in the left-right direction, and the second stop plate is located between the left and right vertical tubes of the right sliding door in the left-right direction.
[0008] In some embodiments of this application, there are several horizontal tubes arranged at intervals in sequence, and the lowest horizontal tube is provided with a roller structure for support on the floor slab; there are at least two first guide members and two second guide members, each of the first guide members corresponding to and matching different horizontal tubes in the left sliding door, and each of the second guide members corresponding to and matching different horizontal tubes in the right sliding door.
[0009] In some embodiments of this application, the second guide member includes a first part and a second part arranged vertically. The first part has an L-shaped structure and includes a first connecting piece and a second connecting piece connected to each other. The second part has a U-shaped structure and includes a third connecting piece, a fourth connecting piece, and a fifth connecting piece connected to one end of the third connecting piece and one end of the fourth connecting piece, respectively. A guide groove of the second guide member is formed between the third connecting piece, the fourth connecting piece, and the fifth connecting piece. The length of the third connecting piece is greater than the length of the fourth connecting piece. A second stop piece is provided on the other end of the third connecting piece. The first connecting piece and the third connecting piece are respectively connected to the second column, and the second connecting piece is connected to the fifth connecting piece.
[0010] In some embodiments of this application, the sliding door for the mezzanine shelf further includes a latching assembly, which includes a latching seat and a latching tongue. The latching seat is disposed on the left sliding door and has a latching opening. The latching tongue is rotatably disposed on the right sliding door. When the left sliding door and the right sliding door abut against each other, the latching tongue can rotate relative to the right sliding door to enter the latching seat through the latching opening and form a limiting engagement with the latching seat to restrict the latching seat from disengaging from the left side.
[0011] In some embodiments of this application, the card holder includes a body, a gasket, and a fastener. The body includes a first plate and a second plate connected in an L-shape, with the second plate located to the left of the first plate. The fastener passes through the first plate and the gasket in sequence and is locked onto the left sliding door. A card holder groove is formed between the first plate, the gasket, and the left sliding door, and the card holder groove has an upward-facing latch. The latch tongue includes a first tongue and a second tongue connected in an L-shape. The first tongue is hinged to the right sliding door and rotates to enter the card holder groove through the latch. The second tongue is located to the left of the second plate.
[0012] In some embodiments of this application, the sliding door for the mezzanine shelf further includes a latch structure, the latch structure including a latch seat and a latch, the latch seat being connected to the left sliding door and / or the right sliding door, the latch being movable up and down through the latch seat, the floor slab having a plurality of holes spaced apart in the left and right direction, the latch being movable relative to the latch seat to extend into or retract into one of the holes.
[0013] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects:
[0014] In this embodiment of the mezzanine shelving, the operator can push and pull the left and right sliding doors according to the size of the goods, so that the gap between the left and right sliding doors is large enough for the goods to enter and be placed on the floor. Then, the left and right sliding doors are pushed and pulled to bring them closer together until they touch, so as to completely close the goods passage. This can effectively reduce the possibility of goods accidentally falling through the goods passage while stored, and ensure the safety of the mezzanine shelving.
[0015] Specifically, the sliding doors of this mezzanine racking system allow for the horizontal movement of the left and right sliding doors on the floor, enabling them to either obstruct or open the cargo passage. This avoids the encroachment on the cargo passage or internal space that occurs with inward-swinging doors, and the collisions that occur with outward-swinging doors. It is also suitable for use in confined external spaces. Therefore, this sliding door system for mezzanine racking improves space utilization and offers advantages such as good safety and wide applicability. Furthermore, the first and second guide members provide guidance to ensure smooth and accurate movement of the left and right sliding doors. They also limit the left and right movement range of the left and right sliding doors, preventing inconvenience caused by excessive movement and thus improving the overall structural stability and safety. Attached Figure Description
[0016] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:
[0017] Figure 1 This is a schematic diagram of a sliding door for a mezzanine shelf, shown according to an exemplary embodiment.
[0018] Figure 2 yes Figure 1 A structural diagram in another state.
[0019] Figure 3 yes Figure 2 A sectional view.
[0020] Figure 4 yes Figure 3 An enlarged structural diagram of region A in the diagram.
[0021] Figure 5 yes Figure 1 A schematic diagram of the mating structure of the middle snap-fit component.
[0022] Figure 6 yes Figure 5 A schematic diagram of its decomposed structure.
[0023] The annotations in the attached figures are explained as follows:
[0024] 1. Mezzanine shelving; 11. Floor panel; 111. Insertion hole; 12. Upright; 121. First upright; 122. Second upright; 13. Goods aisle;
[0025] 2. Door assembly; 21. Left sliding door; 22. Right sliding door; 23. Left vertical tube; 24. Right vertical tube; 25. Horizontal tube; 26. Roller structure;
[0026] 3. Positioning assembly; 31. First guide member; 311. First stop piece; 32. Second guide member; 321. First part; 3211. First connecting piece; 3212. Second connecting piece; 322. Second part; 3221. Third connecting piece; 3222. Fourth connecting piece; 3223. Fifth connecting piece; 323. Second stop piece; 324. Guide groove; 33. Third guide member;
[0027] 4. Buckle assembly; 41. Buckle seat; 411. Main body; 4111. First plate; 4112. Second plate; 412. Gasket; 413. Buckle seat groove; 414. Buckle opening; 42. Buckle tongue; 421. First tongue; 422. Second tongue;
[0028] 5. Pin structure; 51. Pin holder; 52. Pin. Detailed Implementation
[0029] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.
[0030] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.
[0031] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.
[0032] The mezzanine shelving 1 in the following embodiments includes a floor slab 11 suspended above the ground and uprights 12 erected in front of the floor slab 11. Several uprights 12 are spaced apart in the left-right direction. The two uprights 12 in the middle are the first upright 121 and the second upright 122, and a cargo passage 13 is formed between the first upright 121 and the second upright 122.
[0033] Please see Figure 1 and Figure 2 This utility model provides a sliding door for a mezzanine shelf 1, used to cover or open the goods passage 13 of the mezzanine shelf 1. It mainly includes a door assembly 2 and a positioning assembly 3. The door assembly 2 includes a left sliding door 21 and a right sliding door 22, which are movably mounted on the floor 11. The left sliding door 21 partially covers or opens the goods passage 13 from the left side, and the right sliding door 22 partially covers or opens the goods passage 13 from the right side. When the left sliding door 21 and the right sliding door 22 are against each other, they can completely cover the goods passage 13. The positioning assembly 3 includes a first guide member 31 and a second guide member 32. The first guide member 31 is connected to a first upright 121 and is used to guide and cooperate with the left sliding door 21, preventing the left sliding door 21 from disengaging from the first guide member 31 on either side. The second guide member 32 is connected to a second upright 122 and is used to guide and cooperate with the right sliding door 22, preventing the left sliding door 21 from disengaging from the second guide member 32 on either side.
[0034] In the sliding doors of the mezzanine shelving in this embodiment of the utility model, the operator can push and pull the left sliding door 21 and the right sliding door 22 to the left and right respectively according to the size of the goods, so that the gap between the left sliding door 21 and the right sliding door 22 is large enough for the goods to enter and be placed on the floor 11. Then, the left sliding door 21 and the right sliding door 22 are pushed and pulled to the left and right until the left sliding door 21 and the right sliding door 22 are close together until they touch, so as to completely close the goods passage 13. This can effectively reduce the possibility of goods accidentally falling through the goods passage 13 while in storage, and ensure the safety of the mezzanine shelving 1.
[0035] Specifically, the sliding doors of this mezzanine racking system, through the horizontal movement of the left sliding door 21 and the right sliding door 22 on the floor 11, can obstruct or open the cargo passage 13. This avoids the encroachment on the cargo passage 13 or internal space caused by using an inward-swivel door, and the collisions caused by using an outward-swivel door. It is also suitable for use in narrow external spaces. Therefore, using these sliding doors for the mezzanine racking system can improve the space utilization of the mezzanine racking system 1, and has the advantages of good safety and strong applicability. Furthermore, the first guide member 31 and the second guide member 32, on the one hand, provide guidance to ensure that the left sliding door 21 and the right sliding door 22 move smoothly and accurately; on the other hand, they also limit the range of movement of the left and right sliding doors 21 and 22 in the left and right directions, avoiding inconvenience caused by excessive movement of the left and right sliding doors 21 and 22, thereby improving the stability and safety of the overall structure.
[0036] It is conceivable that operators can independently control the left sliding door 21 and the right sliding door 22 from the left and right sides, which is faster, more convenient and less labor-intensive than relying on a single door to open and close the cargo passage 13.
[0037] Please see Figures 1 to 4 In one embodiment where the first guide member 31 is used to guide and cooperate with the left sliding door 21 and prevent the left sliding door 21 from coming off from its left and right sides, and the second guide member 32 is used to guide and cooperate with the right sliding door 22 and prevent the left sliding door 21 from coming off from its left and right sides, both the left sliding door 21 and the right sliding door 22 include a left vertical tube 23, a right vertical tube 24, and a horizontal tube 25 connected to the left vertical tube 23 and the right vertical tube 24 respectively. Both the first guide member 31 and the second guide member 32 are provided with guide grooves 324 that extend from left to right. A first stop plate 311 and a second stop plate 323 are respectively provided on the guide grooves 324 of the first guide member 31. The guide groove 324 of the first guide member 31 is slidably connected to the horizontal tube 25 of the left sliding door 21. The guide groove 324 of the second guide member 32 is slidably connected to the horizontal tube 25 of the right sliding door 22. The first stop plate 311 is located between the left vertical tube 23 and the right vertical tube 24 of the left sliding door 21 in the left-right direction. The second stop plate 323 is located between the left vertical tube 23 and the right vertical tube 24 of the right sliding door 22 in the left-right direction.
[0038] The left vertical tube 23, right vertical tube 24, and horizontal tube 25 are connected to form a frame-like door structure, providing structural support and protection. The guide groove 324 is horizontally continuous, and the horizontal tube 25 of the left sliding door 21 and the right sliding door 22 slide in the guide groove 324 of the first guide member 31 and the guide groove 324 of the second guide member 32, respectively, thereby ensuring that the left sliding door 21 and the right sliding door 22 can move smoothly in the left and right directions. On the other hand, by establishing the positional relationship between the left vertical tube 23 of the left sliding door 21, the right vertical tube 24 of the left sliding door 21, and the first stop plate 311, the first guide member 31 can limit the movement range of the left sliding door 21. By coordinating the positions of the left vertical tube 23 of the right sliding door 22, the right vertical tube 24 of the right sliding door 22, and the second stop plate 323, the movement range of the second guide member 32 of the right sliding door 22 can be restricted, thereby providing a practical implementation method for the coordination between the left sliding door 21 and the first guide member 31, as well as the coordination between the right sliding door 22 and the second guide member 32.
[0039] It can be inferred that when the left sliding door 21 moves to the right until the left vertical tube 23 abuts against the first stop plate 311, the maximum range of movement of the left sliding door 21 to the right is limited. When the left sliding door 21 moves to the left until the right vertical tube 24 abuts against the first stop plate 311, the maximum range of movement of the left sliding door 21 to the left is limited. When the right sliding door 22 moves to the right until the left vertical tube 23 abuts against the second stop plate 323, the maximum range of movement of the right sliding door 22 to the right is limited. When the right sliding door 22 moves to the left until the right vertical tube 24 abuts against the second stop plate 323, the maximum range of movement of the right sliding door 22 to the left is limited.
[0040] Please see Figure 1 and Figure 2 In this embodiment, the positioning component 3 also includes a third guide 33. The number of columns 12 is at least four. The third guide 33 is provided on the other columns 12 except for the first column 121 and the second column 122. The third guide 33 is similar in structure to the first guide 31 and the second guide 32. During the process of the left sliding door 21 gradually opening the cargo passage 13 from the left and the right sliding door 22 gradually opening the cargo passage 13 from the right, the guide 33 establishes a guiding cooperation with the horizontal tube 25 of the left sliding door 21 and the horizontal tube 25 of the right sliding door 22. This allows a stable connection relationship to be established between the column 12 on the left side of the first column 121, the left sliding door 21 and the first column 121, and between the column 12 on the right side of the second column 122, the right sliding door 22 and the second column 122, so as to improve the stability of the overall structure.
[0041] In a further embodiment, the third guide 33 does not have a stop plate for limiting the left and right movement range of the left sliding door 21 and the right sliding door 22.
[0042] It is conceivable that the first column 121 and the other columns 12 located to its left, as well as the second column 122 and the other columns 12 located to its right, can be connected by crossbeams. The crossbeams are located on the outside of each column 12, which can reduce the possibility of goods accidentally falling from the gaps between the other columns 12 outside the cargo passage 13, and does not affect the normal movement of the left sliding door 21 and the right sliding door 22.
[0043] Please see Figures 1 to 3 In a specific embodiment, several horizontal tubes 25 are provided, arranged vertically at intervals. The lowest horizontal tube 25 is provided with a roller structure 26, which is used to support the floor slab 11. At least two first guide members 31 and two second guide members 32 are provided. Each first guide member 31 corresponds to a different horizontal tube 25 in the left sliding door 21, and each second guide member 32 corresponds to a different horizontal tube 25 in the right sliding door 22.
[0044] The arrangement of multiple horizontal tubes 25 at intervals can enhance the overall structural strength of the door assembly 2. Through the cooperation between different first guide members 31 and different horizontal tubes 25 in the left sliding door 21, and the cooperation between different second guide members 32 and different horizontal tubes 25 in the right sliding door 22, multi-point sliding support can be formed for the left sliding door 21 and the right sliding door 22, thereby improving the stability of the movement of each door. The left sliding door 21 and the right sliding door 22 are both supported on the floor slab 11 by the roller structure 26, making the movement of the left sliding door 21 and the right sliding door 22 smoother and less strenuous.
[0045] Please see Figure 3 and Figure 4 In a specific embodiment, the second guide member 32 includes a first part 321 and a second part 322 arranged vertically. The first part 321 has an L-shaped structure and includes a first connecting piece 3211 and a second connecting piece 3212 connected together. The second part 322 has a U-shaped structure and includes a third connecting piece 3221, a fourth connecting piece 3222, and a fifth connecting piece 3223 connected to one end of the third connecting piece 3221 and one end of the fourth connecting piece 3222, respectively. A guide groove 324 of the second guide member 32 is formed between the third connecting piece 3221, the fourth connecting piece 3222, and the fifth connecting piece 3223. The length of the third connecting piece 3221 is greater than the length of the fourth connecting piece 3222, and a second stop piece 323 is provided on the other end of the third connecting piece 3221. The first connecting piece 3211 and the third connecting piece 3221 are respectively connected to the second column 122, and the second connecting piece 3212 is connected to the fifth connecting piece 3223.
[0046] The first connecting piece 3211 and the third connecting piece 3221 are respectively fixed on the second column 122 to distribute the force and avoid stress concentration caused by single-point connection, thereby improving the connection stability between the first fixing member and the second column 122. The horizontal tube 25 of the right sliding door 22 is constrained between the third connecting piece 3221 and the fourth connecting piece 3222 to ensure that it will not come out of the guide groove 324 in the front-back direction. Therefore, the second guide member 32 can limit the right sliding door 22 in four directions, thereby improving the stability and safety of the overall structure.
[0047] It should be noted that the first guide member 31 is designed with reference to the second guide member 32 in the above embodiment, and will not be described in detail here.
[0048] Please see Figure 1 , Figure 2 , Figure 5 and Figure 6 In a specific embodiment, the sliding door for the mezzanine shelf also includes a latch assembly 4, which includes a latch seat 41 and a latch tongue 42. The latch seat 41 is disposed on the left sliding door 21 and has a latching opening 414. The latch tongue 42 is rotatably disposed on the right sliding door 22. When the left sliding door 21 and the right sliding door 22 abut against each other, the latch tongue 42 can rotate relative to the right sliding door 22 to enter the latch seat 41 through the latching opening 414 and form a limiting engagement with the latch seat 41 to prevent the latch seat 41 from disengaging from the left side.
[0049] Compared to simply relying on the door panels to block each other, the latch assembly 4 can establish a positive lock between the left sliding door 21 and the right sliding door 22, preventing the two doors from separating due to vibration or impact, thereby improving security. On the other hand, the lock between the left sliding door 21 and the right sliding door 22 can be established or released by rotating the latch 42 and rotating the latch 42 in the opposite direction, which is quick and convenient to operate.
[0050] Please see Figure 5 and Figure 6In a specific embodiment, the card holder 41 includes a main body 411, a gasket 412, and fasteners. The main body 411 includes a first plate 4111 and a second plate 4112 connected in an L-shape, with the second plate 4112 located to the left of the first plate 4111. The fasteners pass through the first plate 4111 and the gasket 412 in sequence and are locked onto the left sliding door 21. A card holder groove 413 is formed between the first plate 4111, the gasket 412, and the left sliding door 21, and the card holder groove 413 has an upward-facing latch 414. The latch 42 includes a first tongue 421 and a second tongue 422 connected in an L-shape. The first tongue 421 is hinged to the right sliding door 22. The first tongue 421 rotates to enter the slot 413 through the latch 414. The second tongue 422 is located on the left side of the second plate 4112. The second tongue 422 and the second plate 4112 are interlocked in the left and right directions, which has the effect of restricting separation. It has high connection stability, safety and reliability.
[0051] In this embodiment, the fastener is a bolt, and the first tongue 421 is hinged to the right sliding door 22 by the bolt, which makes disassembly and assembly relatively quick and convenient.
[0052] Please see Figure 1 and Figure 2 In a specific embodiment, the sliding door for the mezzanine shelf also includes a latch structure 5, which includes a latch seat 51 and a latch 52. The latch seat 51 is connected to the left guardrail and / or the right guardrail. The latch 52 is movably inserted into the latch seat 51. The floor slab 11 is provided with a plurality of holes 111 arranged at intervals in the left and right directions. The latch 52 moves relative to the latch seat 51 to extend into or retract into one of the holes 111.
[0053] When the door assembly 2 moves to the target position, the operator manually pushes the latch 52 downward to insert the latch 52 into the corresponding socket 111 on the floor slab 11, so as to restrict the left and right movement of the door assembly 2.
[0054] In practical applications, the buckle assembly 4 can connect the left sliding door 21 and the right sliding door 22 together when they collide, and use the pin structure 5 to fix the left guardrail and / or the right guardrail relative to the floor slab 11, so that the left sliding door 21 and the right sliding door 22 can remain in a fixed position when they completely block the cargo passage 13, thus avoiding structural damage caused by collision.
[0055] It should be noted that, since the first guide member 31 and the second guide member 32 can limit the left and right movement range of the left sliding door 21 and the right sliding door 22, when the latching assembly 4 connects the left sliding door 21 and the right sliding door 22, even if the left sliding door 21 and the right sliding door 22 move left and right as a whole, the combination of the left sliding door 21 and the right sliding door 22 can still completely block the cargo passage 13. However, there is a problem mentioned in the above embodiment that the structure may be damaged due to collision.
[0056] It should be noted that, in the preferred embodiment, both the latch structure 5 and the buckle assembly 4 are located on the outside of the first column 121 and the second column 122, so that the operator can lock and unlock the mezzanine shelf from the outside using the sliding door.
[0057] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.
Claims
1. A sliding door for a mezzanine racking system, used to conceal or open the cargo passage of the mezzanine racking system, the mezzanine racking system comprising a floor slab suspended above the ground and uprights erected on the front side of the floor slab, wherein a plurality of uprights are spaced apart in a left-right direction, the two central uprights being designated as a first upright and a second upright, and the cargo passage is formed between the first upright and the second upright, characterized in that... include: The door assembly includes a left sliding door and a right sliding door that are movable left and right on the floor slab. The left sliding door is used to partially block or partially open the cargo passage from the left side, and the right sliding door is used to partially block or partially open the cargo passage from the right side. When the left sliding door and the right sliding door are against each other, the cargo passage can be completely blocked. The positioning component includes a first guide and a second guide. The first guide is connected to the first column and is used to guide and cooperate with the left sliding door and prevent the left sliding door from disengaging from the first guide on the left and right sides. The second guide is connected to the second column and is used to guide and cooperate with the right sliding door and prevent the left sliding door from disengaging from the second guide on the left and right sides.
2. The sliding door for mezzanine shelving according to claim 1, characterized in that, Both the left sliding door and the right sliding door include a left vertical tube, a right vertical tube, and a horizontal tube connected to the left vertical tube and the right vertical tube respectively; Both the first guide member and the second guide member have guide grooves that extend from left to right, and a first stop plate and a second stop plate are respectively provided on them. The guide groove of the first guide member is slidably connected to the horizontal tube of the left sliding door, and the guide groove of the second guide member is slidably connected to the horizontal tube of the right sliding door. The first stop plate is located between the left and right vertical tubes of the left sliding door in the left-right direction, and the second stop plate is located between the left and right vertical tubes of the right sliding door in the left-right direction.
3. The sliding door for mezzanine shelving according to claim 2, characterized in that, The horizontal tubes are provided in several places, and each horizontal tube is arranged vertically at intervals. The bottom horizontal tube is provided with a roller structure, which is used to support the floor slab. The first guide and the second guide are provided in at least two, each of the first guides is matched with a different horizontal tube in the left sliding door, and each of the second guides is matched with a different horizontal tube in the right sliding door.
4. The sliding door for mezzanine shelving according to claim 2, characterized in that, The second guide includes a first part and a second part arranged vertically. The first part has an L-shaped structure and includes a first connecting piece and a second connecting piece connected to each other. The second part has a U-shaped structure and includes a third connecting piece, a fourth connecting piece, and a fifth connecting piece that is connected to one end of the third connecting piece and one end of the fourth connecting piece, respectively. A guide groove of the second guide is formed between the third connecting piece, the fourth connecting piece, and the fifth connecting piece. The length of the third connecting piece is greater than the length of the fourth connecting piece. A second stop piece is provided on the other end of the third connecting piece. The first connecting piece and the third connecting piece are respectively connected to the second column, and the second connecting piece is connected to the fifth connecting piece.
5. The sliding door for mezzanine shelving according to claim 1, characterized in that, It also includes a latching assembly, which includes a latching seat and a latching tongue. The latching seat is disposed on the left sliding door and has a latching opening, and the latching tongue is rotatably disposed on the right sliding door. When the left sliding door and the right sliding door abut each other, the latch can rotate relative to the right sliding door to enter the card slot through the latch and form a limiting engagement with the card slot to restrict the card slot from disengaging from the left side of the latch.
6. The sliding door for mezzanine shelving according to claim 5, characterized in that, The card holder includes a main body, a gasket, and fasteners. The main body includes a first plate and a second plate connected in an L-shape, with the second plate located to the left of the first plate. The fasteners pass through the first plate and the gasket in sequence and are locked onto the left sliding door. A card holder groove is formed between the first plate, the gasket, and the left sliding door, and the card holder groove has an upward-facing latch. The latch includes a first tongue and a second tongue connected in an L-shape. The first tongue is hinged to the right sliding door. The first tongue rotates to enter the slot of the latch through the latch, and the second tongue is located on the left side of the second plate.
7. The sliding door for mezzanine shelving according to claim 5, characterized in that, It also includes a latch structure, which includes a latch seat and a latch. The latch seat is connected to the left sliding door and / or the right sliding door. The latch is movable up and down and passes through the latch seat. The floor slab is provided with a plurality of holes arranged at intervals in the left and right direction. The latch moves relative to the latch seat to extend into or retract into one of the holes.