Tray locking device and tray assembly

Abstract

The utility model provides a tray locking device and tray subassembly, tray locking device includes: first fixed part, second fixed part and locking mechanism, locking mechanism includes first connecting piece, second connecting piece, locking subassembly and limit subassembly, first connecting piece is provided on the first fixed part, second connecting piece is provided on the second fixed part, locking subassembly is provided on the second fixed part, and limit subassembly is provided on the second fixed part. The locking assembly and the limiting assembly are both arranged on the first connecting piece, the second connecting piece is arranged on the first connecting piece in a push-pull mode, and the second connecting piece is provided with a locking position and an unlocking position; in the locking device, the second connecting piece locks the locking assembly on the second fixing part, the push-pull direction of the second connecting piece is perpendicular to the locking direction of the locking assembly, the limiting assembly is matched with the second connecting piece in a limiting mode, and in the unlocking position, the second connecting piece avoids the locking assembly so as to unlock the locking assembly. According to the technical scheme provided by the utility model, the problem that the tray is easy to separate after being assembled in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a tray locking device and a tray assembly. Background Art

[0002] At present, heavy goods are mostly packed in multiple boxes on pallets. After the entire pallet is delivered to the user, the pallet needs to be disassembled for delivery, which has a high logistics cost. At present, the common practice is to design an assembleable pallet, and realize the assembly and bulk delivery of goods by assembling and separating the pallets. In the prior art, a groove and flange spring structure is used, which makes the pallet easy to separate and combine. However, when a certain force value is reached, the above structure has the problem of easy detachment. Utility Model Content

[0003] The utility model provides a pallet locking device and a pallet assembly, so as to solve the problem in the prior art that the pallets are easily separated after being assembled.

[0004] In order to solve the above problems, the utility model provides a pallet locking device, including: a first fixing part, a second fixing part and a locking mechanism, the locking mechanism including a first connecting piece, a second connecting piece, a locking assembly and a limiting assembly, the first connecting piece is arranged on the first fixing part, the locking assembly and the limiting assembly are both arranged on the first connecting piece, the second connecting piece can be pushed and pulled on the first connecting piece, and the second connecting piece has a locking position and an unlocking position; wherein, in the locking device, the second connecting piece locks the locking assembly on the second fixing part, the pushing and pulling direction of the second connecting piece is perpendicular to the locking direction of the locking assembly, the limiting assembly and the second connecting piece are limitedly matched, and in the unlocking position, the second connecting piece avoids the locking assembly to unlock the locking assembly.

[0005] Furthermore, the locking assembly includes a first locking member, which is arranged on the first connecting member. In the locking device, the first locking member and the first connecting member abut against each other, and the second connecting member pushes the first locking member into the second fixed part. The first locking member and the second fixed part are limited in position, and the pushing and pulling direction of the second connecting member is perpendicular to the limiting direction of the first locking member and the second fixed part.

[0006] Furthermore, the locking assembly also includes a second locking member arranged on the first connecting member, and the second locking member and the first locking member are arranged at intervals. In the locking device, the second connecting member locks the first locking member and the second locking member on the second fixed part. In the unlocking position, the second connecting member avoids the first locking member and the second locking member to unlock the first locking member and the second locking member.

[0007] Furthermore, the first locking member is a first elastic latch, the second locking member is a second elastic latch, the second fixing portion has a first limiting groove and a second limiting groove, and in the locking device, the second connecting member pushes the first elastic latch into the first limiting groove, the first elastic latch and the inner wall of the first limiting groove are limitedly matched, and the second connecting member pushes the second elastic latch into the second limiting groove, the second elastic latch and the inner wall of the second limiting groove are limitedly matched.

[0008] Furthermore, the end of the second connecting member has a first inclined surface, the first locking member has a second inclined surface, and in the locking device, the first inclined surface and the second inclined surface abut against each other.

[0009] Furthermore, the limiting assembly includes a third elastic locking member, and the side wall of the second connecting member is provided with a first limiting hole and a second limiting hole. In the locking device, the third locking member is inserted into the first limiting hole and is limitedly matched with the inner wall of the first limiting hole. In the unlocking position, the third locking member is inserted into the second limiting hole and is limitedly matched with the inner wall of the second limiting hole.

[0010] Furthermore, the second connecting member includes a first plate body and a second plate body connected to each other, the first connecting member has a receiving groove, the first plate body and the second plate body are perpendicular to each other, the first plate body is located in the receiving groove, and the second plate body can be pushed and pulled to drive the first plate body to move in the receiving groove. In the locking device, the first plate body locks the locking assembly on the second fixed part. In the unlocking position, the first plate body avoids the locking assembly to unlock the locking assembly.

[0011] Further, the first connecting member and the first fixing portion are slidably matched. In the locked position, a portion of the first connecting member extends out of the first fixing portion and is slidably matched with the second fixing portion. In the unlocked position, the first connecting member is located in the first fixing portion.

[0012] Further, the first connecting member includes a third plate body and a fourth plate body that are connected to each other, the first fixing portion has a first slide groove and a second slide groove, the two ends of the third plate body are respectively located in the first slide groove and the second slide groove, the two ends of the third plate body are respectively slidably matched with the inner wall of the first slide groove and the inner wall of the second slide groove, and the second connecting member is arranged on the fourth plate body.

[0013] Furthermore, the first fixing portion includes a first connecting block and a second connecting block which are spaced apart from each other, the first connecting block has a first sliding groove, the second connecting block has a second sliding groove, and the fourth plate is arranged between the first connecting block and the second connecting block.

[0014] Furthermore, the second fixing portion has a third slide groove and a fourth slide groove, the two ends of the first connecting member are slidably matched with the third slide groove and the fourth slide groove respectively, the first limiting groove is arranged on the inner wall of the third slide groove, and the second limiting groove is arranged on the inner wall of the fourth slide groove.

[0015] Furthermore, the second fixing portion includes a third connecting block and a fourth connecting block which are arranged at intervals, the third connecting block has a third sliding groove, and the fourth connecting block has a fourth sliding groove.

[0016] Another embodiment of the utility model provides a tray assembly, which includes a first tray, a second tray and the above-mentioned tray locking device, wherein the first fixing portion of the tray locking device is arranged on the first tray, and the second fixing portion of the tray locking device is arranged on the second tray.

[0017] Applying the technical solution of the utility model, a pallet locking device is provided, comprising: a first fixing part, a second fixing part and a locking mechanism, the locking mechanism comprising a first connecting piece, a second connecting piece, a locking assembly and a limiting assembly, the first connecting piece is arranged on the first fixing part, the locking assembly and the limiting assembly are both arranged on the first connecting piece, the second connecting piece can be pushed and pulled on the first connecting piece, and the second connecting piece has a locking position and an unlocking position; wherein, in the locking device, the second connecting piece locks the locking assembly on the second fixing part, the pushing and pulling direction of the second connecting piece is perpendicular to the locking direction of the locking assembly, the limiting assembly and the second connecting piece are limitedly matched, and in the unlocking position, the second connecting piece avoids the locking assembly to unlock the locking assembly. By adopting this solution, when the locking device is used, the second connecting member locks the locking assembly on the second fixed part, and the push-pull direction of the second connecting member is perpendicular to the locking direction of the locking assembly. At the same time, the limiting assembly and the second connecting member are used to limit the position, so that when a force is applied in the push-pull direction of the second connecting member, the locking assembly cannot be separated from the second fixed part, and the second connecting member can be limited by the limiting assembly, thereby limiting the position of the second connecting member, thereby ensuring the reliability and stability of the connection between the first fixed part and the second fixed part; similarly, when in the unlocked position, the second connecting member can avoid the locking assembly to ensure that the first fixed part and the second fixed part will not interfere when they are separated. The pallet locking device of this solution can effectively solve the problem of the pallet being easy to separate after assembly in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of a tray locking device provided in an embodiment of the utility model is shown;

[0020] Figure 2 Shows Figure 1 A cross-sectional view of the locking device of the middle tray;

[0021] Figure 3 Shows Figure 1 A partial enlarged view of the locking device of the middle tray;

[0022] Figure 4 Shows Figure 1 Cross-sectional view of the middle tray locking device after connecting the first tray and the second tray.

[0023] The above drawings include the following reference numerals:

[0024] 10. First fixing portion; 11. First sliding groove; 12. Second sliding groove; 13. First connecting block; 14. Second connecting block;

[0025] 20. second fixing portion; 21. first limiting groove; 22. second limiting groove; 23. third sliding groove; 24. fourth sliding groove; 25. third connecting block; 26. fourth connecting block;

[0026] 30. Locking mechanism; 31. First connecting member; 311. Third plate; 312. Fourth plate; 32. Second connecting member; 321. First plate; 322. Second plate; 323. First inclined surface; 324. First limiting hole; 325. Second limiting hole; 33. Locking assembly; 331. First locking member; 3311. First elastic latch; 3312. Second inclined surface; 332. Second locking member; 3322. Second elastic latch; 333. Third locking member; 34. Limiting assembly;

[0027] 41. First tray; 42. Second tray. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] like Figures 1 to 4As shown, an embodiment of the utility model provides a pallet locking device, comprising: a first fixing portion 10, a second fixing portion 20 and a locking mechanism 30, the locking mechanism 30 comprising a first connecting member 31, a second connecting member 32, a locking assembly 33 and a limiting assembly 34, the first connecting member 31 is arranged on the first fixing portion 10, the locking assembly 33 and the limiting assembly 34 are both arranged on the first connecting member 31, the second connecting member 32 can be pushed and pulled on the first connecting member 31, and the second connecting member 32 has a locking position and an unlocking position; wherein, in the locking device, the second connecting member 32 locks the locking assembly 33 on the second fixing portion 20, the pushing and pulling direction of the second connecting member 32 is perpendicular to the locking direction of the locking assembly 33, the limiting assembly 34 and the second connecting member 32 are limitedly matched, and in the unlocking position, the second connecting member 32 avoids the locking assembly 33 to unlock the locking assembly 33.

[0030] By adopting this scheme, when the locking device is used, the second connecting member 32 locks the locking assembly 33 on the second fixing part 20, and the push-pull direction of the second connecting member 32 is perpendicular to the locking direction of the locking assembly 33. At the same time, the limiting assembly 34 and the second connecting member 32 are used to limit the position, so that the locking assembly 33 cannot be separated from the second fixing part 20 when a force is applied in the push-pull direction of the second connecting member 32, and the second connecting member 32 can be limited by the limiting assembly 34, thereby limiting the position of the second connecting member 32, thereby ensuring the reliability and stability of the connection between the first fixing part 10 and the second fixing part 20; similarly, when in the unlocking position, the second connecting member 32 can avoid the locking assembly 33, and the locking assembly 33 is restored to the initial position by elastic force, ensuring that the first fixing part 10 and the second fixing part 20 will not interfere when they are separated. By using the tray locking device of this scheme, the problem that the tray in the prior art is easy to be separated after assembly can be effectively solved.

[0031] Among them, the locking assembly 33 includes a first locking member 331, and the first locking member 331 is arranged on the first connecting member 31. In the locking device, the first locking member 331 and the first connecting member 31 are abutted, and the second connecting member 32 pushes the first locking member 331 into the second fixed part 20. The first locking member 331 and the second fixed part 20 are limited in position, and the pushing and pulling direction of the second connecting member 32 is perpendicular to the limiting direction of the first locking member 331 and the second fixed part 20.

[0032] In this way, the second connecting member 32 can push the first locking member 331 into the second fixing portion 20, and the first locking member 331 and the second fixing portion 20 are limited and matched, so that the second fixing portion 20 and the first connecting member 31 are connected; at the same time, the pushing and pulling direction of the second connecting member 32 is perpendicular to the limiting direction of the first locking member 331 and the second fixing portion 20, so as to ensure that it will not loosen easily.

[0033] Furthermore, the locking assembly 33 also includes a second locking member 332 arranged on the first connecting member 31, and the second locking member 332 and the first locking member 331 are arranged at intervals. In the locking device, the second connecting member 32 locks the first locking member 331 and the second locking member 332 on the second fixed portion 20. In the unlocking position, the second connecting member 32 avoids the first locking member 331 and the second locking member 332 to unlock the first locking member 331 and the second locking member 332.

[0034] With this arrangement, in the locking device, the second connecting member 32 simultaneously locks the first locking member 331 and the second locking member 332 on the second fixing portion 20 , further ensuring the reliability of the connection between the second fixing portion 20 and the first connecting member 31 .

[0035] In this embodiment, the first locking member 331 is a first elastic pin 3311, the second locking member 332 is a second elastic pin 3322, the second fixing portion 20 has a first limiting groove 21 and a second limiting groove 22, in the locking device, the second connecting member 32 pushes the first elastic pin 3311 into the first limiting groove 21, the first elastic pin 3311 and the inner wall of the first limiting groove 21 are limitedly matched, the second connecting member 32 pushes the second elastic pin 3322 into the second limiting groove 22, the second elastic pin 3322 and the inner wall of the second limiting groove 22 are limitedly matched.

[0036] In the present embodiment, the first elastic pin 3311 and the second elastic pin 3322 can be adopted so that in the locked position, the second connecting member 32 can push the first elastic pin 3311 into the first limiting groove 21, the first elastic pin 3311 and the inner wall of the first limiting groove 21 are limited and matched, the second connecting member 32 can push the second elastic pin 3322 into the second limiting groove 22, the second elastic pin 3322 and the inner wall of the second limiting groove 22 are limited and matched, and at the same time, when the position is resolved, the first elastic pin 3311 and the second elastic pin 3322 can be restored to the initial position by the action of elastic force.

[0037] Specifically, the end of the second connecting member 32 has a first inclined surface 323 , and the first locking member 331 has a second inclined surface 3312 . In the locking device, the first inclined surface 323 and the second inclined surface 3312 are in contact with each other.

[0038] With this arrangement, in the locking device, the first inclined surface 323 and the second inclined surface 3312 are abutted against each other, so that the second connecting member 32 can be easily pushed into the first locking member 331, and can also play a guiding role.

[0039] In this embodiment, the limiting component 34 includes a third elastic locking member 333, and the side wall of the second connecting member 32 is provided with a first limiting hole 324 and a second limiting hole 325. In the locking device, the third locking member 333 is inserted into the first limiting hole 324 and is limitedly matched with the inner wall of the first limiting hole 324. In the unlocking position, the third locking member 333 is inserted into the second limiting hole 325 and is limitedly matched with the inner wall of the second limiting hole 325.

[0040] With the above arrangement, the third locking member 333 is elastic, so that it is easy to switch from the locking position to the unlocking position, that is, to switch from the first limiting hole 324 to the second limiting hole 325 .

[0041] In the solution, the third locking member 333 is a spherical plunger.

[0042] Specifically, the second connecting member 32 includes a first plate body 321 and a second plate body 322 that are connected to each other. The first connecting member 31 has a receiving groove. The first plate body 321 and the second plate body 322 are perpendicular to each other. The first plate body 321 is located in the receiving groove. The second plate body 322 can be pushed and pulled to drive the first plate body 321 to move in the receiving groove. In the locking device, the first plate body 321 locks the locking assembly 33 on the second fixing portion 20. In the unlocking position, the first plate body 321 avoids the locking assembly 33 to unlock the locking assembly 33.

[0043] In this way, the first plate 321 and the second plate 322 are arranged perpendicular to each other, so that it is convenient for a forklift to abut against the second plate 322, thereby pushing and pulling the second plate 322; the first plate 321 is arranged in the receiving groove, and the receiving groove can limit the first plate 321.

[0044] In this embodiment, the first connecting member 31 and the first fixing portion 10 are slidably matched. In the locked position, a portion of the first connecting member 31 extends out of the first fixing portion 10 and slidably matches with the second fixing portion 20. In the unlocked position, the first connecting member 31 is located in the first fixing portion 10.

[0045] In this solution, the first connecting member 31 and the first fixing portion 10 are slidably matched, so that the second connecting member 32 can drive the first connecting member 31 to slide in the first fixing portion 10, so that a part of the first connecting member 31 extends out of the first fixing portion 10 and can slide in the second fixing portion 20; at the same time, when in the unlocked position, the first connecting member 31 is in the first fixing portion 10, thereby playing a avoidance role for the second tray to prevent interference.

[0046] Among them, the first connecting member 31 includes a third plate body 311 and a fourth plate body 312 that are connected to each other, the first fixing portion 10 has a first slide groove 11 and a second slide groove 12, the two ends of the third plate body 311 are respectively located in the first slide groove 11 and the second slide groove 12, the two ends of the third plate body 311 are respectively slidably matched with the inner wall of the first slide groove 11 and the inner wall of the second slide groove 12, and the second connecting member 32 is arranged on the fourth plate body 312.

[0047] This arrangement enables both ends of the third plate body 311 to slide in the first slide groove 11 and the second slide groove 12 respectively, and at the same time, the inner wall of the first slide groove 11 and the inner wall of the second slide groove 12 can limit the third plate body 311 .

[0048] Furthermore, the first fixing portion 10 includes a first connecting block 13 and a second connecting block 14 which are spaced apart from each other, the first connecting block 13 has a first sliding groove 11 , the second connecting block 14 has a second sliding groove 12 , and the fourth plate 312 is disposed between the first connecting block 13 and the second connecting block 14 .

[0049] With the above arrangement, the first connecting block 13 and the second connecting block 14 can limit the two ends of the fourth plate body 312 , thereby ensuring the normal movement of the fourth plate body 312 .

[0050] Specifically, the second fixing portion 20 has a third slide groove 23 and a fourth slide groove 24, and the two ends of the first connecting member 31 are slidably matched with the third slide groove 23 and the fourth slide groove 24 respectively. The first limiting groove 21 is arranged on the inner wall of the third slide groove 23, and the second limiting groove 22 is arranged on the inner wall of the fourth slide groove 24.

[0051] Such a configuration facilitates the setting of the first limiting groove 21 and the second limiting groove 22, wherein the shapes of the first limiting groove 21 and the second limiting groove 22 match the shapes of the first locking member 331 and the second locking member 332. In this embodiment, the shapes of the first limiting groove 21 and the second limiting groove 22 are U-shaped.

[0052] The second fixing portion 20 includes a third connecting block 25 and a fourth connecting block 26 which are arranged at intervals. The third connecting block 25 has a third sliding groove 23 , and the fourth connecting block 26 has a fourth sliding groove 24 .

[0053] In this way, when in the locked position, the third connecting block 25 and the fourth connecting block 26 can guide the first connecting member 31. At the same time, the third sliding groove 23 and the fourth sliding groove 24 are conveniently arranged.

[0054] According to another embodiment of the utility model, a pallet assembly is provided, which includes a first pallet 41, a second pallet 42 and the above-mentioned pallet locking device, wherein the first fixing portion 10 in the pallet locking device is arranged on the first pallet 41, and the second fixing portion 20 in the pallet locking device is arranged on the second pallet 42.

[0055] It should be noted that the pallet locking device of the present solution can also achieve rapid disassembly and assembly. When in use, the second connecting member 32 can be pushed and pulled by a forklift to achieve disassembly and assembly of the first pallet 41 and the second pallet 42, thereby improving the disassembly and assembly efficiency; and the disassembly and assembly of multiple pallets can also be achieved, that is, the first pallet 41 in the solution can be simultaneously provided with the first fixing portion 10 and the second fixing portion 20, thereby achieving disassembly and assembly between multiple pallets.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tray locking device, characterized in that: The invention comprises a first fixing part (10), a second fixing part (20) and a locking mechanism (30), wherein the locking mechanism (30) comprises a first connecting member (31), a second connecting member (32), a locking assembly (33) and a limiting assembly (34), wherein the first connecting member (31) is arranged on the first fixing part (10), the locking assembly (33) and the limiting assembly (34) are both arranged on the first connecting member (31), the second connecting member (32) can be arranged on the first connecting member (31) in a push-pull manner, and the second connecting member (32) has a locking position and an unlocking position; wherein, in the locking device, the second connecting member (32) locks the locking assembly (33) on the second fixing part (20), the pushing and pulling direction of the second connecting member (32) is perpendicular to the locking direction of the locking assembly (33), the limiting assembly (34) and the second connecting member (32) are limitedly matched, and in the unlocking position, the second connecting member (32) avoids the locking assembly (33) to unlock the locking assembly (33).

2. The tray locking device according to claim 1, characterized in that: The locking assembly (33) comprises a first locking member (331), wherein the first locking member (331) is arranged on the first connecting member (31); in the locking device, the first locking member (331) and the first connecting member (31) are in abutment with each other, and the second connecting member (32) pushes the first locking member (331) into the second fixing portion (20); the first locking member (331) and the second fixing portion (20) are limited in position, and the pushing and pulling direction of the second connecting member (32) is perpendicular to the limiting direction of the first locking member (331) and the second fixing portion (20).

3. The tray locking device according to claim 2, characterized in that: The locking assembly (33) further comprises a second locking member (332) arranged on the first connecting member (31), wherein the second locking member (332) and the first locking member (331) are arranged at an interval, and in the locking device, the second connecting member (32) locks the first locking member (331) and the second locking member (332) on the second fixing portion (20), and in the unlocking position, the second connecting member (32) avoids the first locking member (331) and the second locking member (332) to unlock the first locking member (331) and the second locking member (332).

4. The tray locking device according to claim 3, characterized in that: The first locking member (331) is a first elastic latch (3311), the second locking member (332) is a second elastic latch (3322), the second fixing portion (20) has a first limiting groove (21) and a second limiting groove (22), in the locking device, the second connecting member (32) pushes the first elastic latch (3311) into the first limiting groove (21), the first elastic latch (3311) and the inner wall of the first limiting groove (21) are limitedly matched, the second connecting member (32) pushes the second elastic latch (3322) into the second limiting groove (22), the second elastic latch (3322) and the inner wall of the second limiting groove (22) are limitedly matched.

5. The tray locking device according to claim 2, characterized in that: The end of the second connecting member (32) has a first inclined surface (323), and the first locking member (331) has a second inclined surface (3312). In the locking device, the first inclined surface (323) and the second inclined surface (3312) are in abutment with each other.

6. The tray locking device according to claim 2, characterized in that: The limiting assembly (34) includes a third elastic locking member (333), and the side wall of the second connecting member (32) is provided with a first limiting hole (324) and a second limiting hole (325). In the locking device, the third locking member (333) is inserted into the first limiting hole (324) and is limitedly matched with the inner wall of the first limiting hole (324). In the unlocking position, the third locking member (333) is inserted into the second limiting hole (325) and is limitedly matched with the inner wall of the second limiting hole (325).

7. The tray locking device according to claim 1, characterized in that: The second connecting member (32) comprises a first plate body (321) and a second plate body (322) which are connected to each other. The first connecting member (31) has a receiving groove. The first plate body (321) and the second plate body (322) are perpendicular to each other. The first plate body (321) is located in the receiving groove. The second plate body (322) can be pushed and pulled to drive the first plate body (321) to move in the receiving groove. In the locking device, the first plate body (321) locks the locking assembly (33) on the second fixing portion (20). In the unlocking position, the first plate body (321) avoids the locking assembly (33) to unlock the locking assembly (33).

8. The tray locking device according to claim 1, characterized in that: The first connecting member (31) and the first fixing portion (10) are slidably matched. In the locked position, a portion of the first connecting member (31) extends out of the first fixing portion (10) and is slidably matched with the second fixing portion (20). In the unlocked position, the first connecting member (31) is located in the first fixing portion (10).

9. The tray locking device according to claim 8, characterized in that: The first connecting member (31) comprises a third plate body (311) and a fourth plate body (312) which are connected to each other, the first fixing portion (10) comprises a first slide groove (11) and a second slide groove (12), two ends of the third plate body (311) are respectively located in the first slide groove (11) and the second slide groove (12), the two ends of the third plate body (311) are respectively slidably matched with the inner wall of the first slide groove (11) and the inner wall of the second slide groove (12), and the second connecting member (32) is arranged on the fourth plate body (312).

10. The tray locking device according to claim 9, characterized in that: The first fixing portion (10) comprises a first connecting block (13) and a second connecting block (14) which are arranged at an interval, the first connecting block (13) having the first sliding groove (11), the second connecting block (14) having the second sliding groove (12), and the fourth plate body (312) being arranged between the first connecting block (13) and the second connecting block (14).

11. The tray locking device according to claim 4, characterized in that: The second fixing portion (20) has a third slide groove (23) and a fourth slide groove (24), the two ends of the first connecting member (31) are respectively slidably matched with the third slide groove (23) and the fourth slide groove (24), the first limiting groove (21) is arranged on the inner wall of the third slide groove (23), and the second limiting groove (22) is arranged on the inner wall of the fourth slide groove (24).

12. The tray locking device according to claim 11, characterized in that: The second fixing portion (20) comprises a third connecting block (25) and a fourth connecting block (26) which are arranged at an interval, the third connecting block (25) having the third sliding groove (23), and the fourth connecting block (26) having the fourth sliding groove (24).

13. A tray assembly, characterized in that: The tray assembly comprises a first tray (41), a second tray (42) and a tray locking device according to any one of claims 1 to 12, wherein the first fixing portion (10) of the tray locking device is arranged on the first tray (41), and the second fixing portion (20) of the tray locking device is arranged on the second tray (42).

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