A tray

Abstract

The present application relates to a kind of tray, including bottom plate, be provided with the positioning unit for supporting chip on bottom plate, positioning unit includes multiple positioning components, multiple positioning components are distributed on the upper surface of bottom plate, and multiple positioning components are enclosed into placement area;The upper surface of bottom plate is provided with first recess, and the through hole is opened in first recess, and the through hole penetrates bottom plate;Positioning component includes positioning body, cover body, positioning body is shaped in first recess, cover body covers the surface including first recess, positioning body, and cover body passes through through hole and covers the lower surface of part bottom plate.The bottom plate of the present application has good tenacity and strength and stable structure, and the cover body can provide sufficient cushioning force for the chip, so that the tray has high strength and good buffering performance, improves the protection performance of the tray to chip;The connecting force between cover body and bottom plate is strong, not easy to fall off, and the structural stability is good;Cover body structure is simple, and material consumption is less, reduces production and processing cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic manufacturing, and particularly relates to a tray. BACKGROUND

[0002] As a kind of electronic components, especially high-end chips, the value of the chip is high but it is easy to be damaged or fail, and the packaging protection of the chip has a very high requirement. The tray is an indispensable carrier in the process of chip packaging, testing and patching, and accompanies the whole manufacturing process of the chip.

[0003] At present, the common tray is made by single-color injection molding process or injection molding plus rubber coating process. The single-color injection molding process is to use only one kind of hard glue material for injection molding. The strength of the injection molded tray is good, but the material is hard. However, for large-size and heavy chips, the injection molded tray is easy to damage the chip, and the injection molded material is easy to fall off and pollute the chip, thereby causing quality problems. The tray made by the injection molding plus rubber coating process is made by single-color injection molding of the hard glue material on the bottom plate, and positioning protrusions for positioning the chip are formed on the upper surface and the lower surface of the bottom plate. Then, the soft rubber is coated on the positioning protrusions on the upper surface and the lower surface of the bottom plate by double-sided rubber coating process. The strength of the hard glue is good, which can ensure the strength of the tray. The hardness of the soft rubber is small, which can provide a certain buffer force for the chip to reduce the stress and avoid damage to the chip. However, when the soft rubber is coated, the positioning protrusions on the upper surface and the lower surface of the bottom plate need to be coated completely, which causes waste of materials and increases production cost. Moreover, the injection molding plus rubber coating process needs to use two sets of molds for processing, and the forming time is long, and the size is not easy to control during forming. SUMMARY

[0004] The purpose of the present application is to provide a tray with high strength, stable structure and effective protection for products, which can be applied to chips and other parts for packaging and transportation to reduce the damage.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A tray comprises a bottom plate, wherein the bottom plate is provided with a positioning unit for supporting a chip, the positioning unit comprises a plurality of positioning components, the plurality of positioning components are distributed on the upper surface of the bottom plate, and the plurality of positioning components are surrounded to form a placing area; the upper surface of the bottom plate is provided with a first groove, a through hole is formed in the first groove, and the through hole penetrates the bottom plate; the positioning component comprises a positioning body and a covering body, the positioning body is formed in the first groove, the covering body is made of elastic material, the surface of the first groove and the positioning body is covered by the covering body, and the covering body penetrates the through hole and covers part of the lower surface of the bottom plate.

[0007] Preferably, the base plate and the positioning body are made of the same material and are integrally formed; the base plate and the cover body are integrally formed by two-color injection molding, the size is easy to control, the molding time is short, the process is simple, and the connection strength between the base plate and the cover body is high.

[0008] Preferably, the material of the base plate is hard glue, and the hard glue includes MPPO, PAS, PPE, and ABS; and / or the material of the cover body is soft glue, and the soft glue includes TPU, TPE, and silicone. When injection molding is performed, the hard glue and the soft glue can be mutually adsorbed and fused to a certain extent, a bonding force is generated, and the connection strength between the base plate and the cover body is further improved.

[0009] Preferably, the cover body covers part of the surface of the positioning body and has a supporting surface and a limiting surface, the supporting surface extends in the horizontal direction, the limiting surface extends in the vertical direction, and the height of the supporting surface is higher than the upper surface of the base plate. The supporting surface can stably support the chip in the vertical direction, and the limiting surface can limit the displacement of the chip in the horizontal direction.

[0010] Preferably, the height of the cover body covered in the first groove is lower than the upper surface of the base plate.

[0011] Preferably, the positioning assembly further includes a connecting body, the connecting body is arranged on the upper surface of the base plate on one side of the positioning body, the connecting body and the placement area are located on both sides of the positioning body, and the cover body covers between the connecting body and the positioning body. The connecting body is arranged to further improve the connection strength of the cover body.

[0012] Preferably, a second groove is further arranged in the first groove, and the through hole extends to the second groove. The second groove is arranged to increase the contact area of the cover body and further improve the connection strength thereof.

[0013] Further preferably, at least part of the bottom surface of the first groove protrudes from the lower surface of the base plate, the depth of the first groove and the second groove is ensured, the thickness of the base plate is prevented from being too large, and the purpose of weight reduction is achieved.

[0014] Preferably, a plurality of positioning assemblies surround the placement area in four directions.

[0015] Preferably, a plurality of positioning bodies are arranged, the plurality of positioning bodies are distributed along the length direction of the first groove; and the width of the top of the positioning body is smaller than the width of the bottom of the positioning body.

[0016] Preferably, a plurality of through holes are arranged, and the plurality of through holes are distributed along the length direction of the first groove; the number of the through holes is 1-4.

[0017] Preferably, the upper surface of the bottom plate is provided with an upper support body, when the trays are stacked, the upper support body of the tray in the lower layer is supported on the lower surface of the tray in the upper layer.

[0018] Further preferably, the lower surface of the bottom plate is provided with a lower support body, when the trays are stacked, the upper support body of the tray in the lower layer is supported on the lower support body of the tray in the upper layer. The upper support body and the lower support body not only serve as support when stacked, but also improve the overall strength of the tray.

[0019] Preferably, a plurality of weight-reducing holes are arranged on the bottom plate, and the weight-reducing holes penetrate the bottom plate.

[0020] Preferably, the tray further comprises a frame, the frame is enclosed around the periphery of the bottom plate, and the tray further comprises a reinforcing assembly, the reinforcing assembly comprises reinforcing ribs, and the reinforcing ribs are arranged between the bottom plate and the frame. Arranging the reinforcing ribs can improve the overall strength of the tray and prevent the tray from being deformed when clamped, thereby preventing damage to the chips.

[0021] Preferably, a plurality of positioning units are arranged, and the plurality of positioning units are distributed along the length direction of the bottom plate; the number of the positioning units is 1-8.

[0022] Thanks to the above technical scheme, the present application has the following advantages compared with the prior art:

[0023] The present application arranges a cover on the bottom plate, the bottom plate has good toughness and strength and stable structure, the cover can provide sufficient buffering force for the chips, so that the tray has high strength and good buffering performance, and the protection performance of the tray for the chips is effectively improved; the connection between the cover and the bottom plate is strong and not easy to fall off, and has good structural stability; the structure of the cover is simple, the material consumption is small, the production and processing cost is reduced, the weight of the tray is light, packaging and transportation are convenient, and the practicality is good. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a top view of the tray of the present application; Figure 1 FIG. 2 is a sectional view of the tray of the present application;

[0025] FIG. 3 is a sectional view of the tray of the present application; Figure 2 FIG. 4 is an enlarged view of part A in FIG. 3; Figure 1 FIG. 5 is an enlarged view of part B in FIG. 3;

[0026] FIG. 6 is an enlarged view of part C in FIG. 3; Figure 3 FIG. 7 is an enlarged view of part D in FIG. 3; Figure 1Cross-sectional view of the middle B-B;

[0027] Figure 1 is a schematic view of the tray of the present embodiment; Figure 4 Figure 2 is a schematic view of the tray of the present embodiment with the cover body set; Figure 3 Figure 3 is a partial enlarged view at the middle C of the tray of the present embodiment;

[0028] Figure 4 is a schematic view of the tray of the present embodiment from below; Figure 5 Figure 5 is a schematic view of the tray of the present embodiment from above;

[0029] Figure 6 is a schematic view of the tray of the present embodiment with the cover body set from below; Figure 6 Figure 7 is a schematic view of the tray of the present embodiment with the cover body set from above; Figure 5 Figure 8 is a partial enlarged view at the middle D of the tray of the present embodiment;

[0030] Figure 9 is a schematic view of the tray of the present embodiment without the cover body from above; Figure 7 Figure 10 is a schematic view of the tray of the present embodiment without the cover body from below;

[0031] Figure 11 is a schematic view of the tray of the present embodiment without the cover body from above; Figure 8 Figure 12 is a schematic view of the tray of the present embodiment without the cover body from below; Figure 7 Figure 13 is a partial enlarged view at the middle E of the tray of the present embodiment;

[0032] Figure 14 is a schematic view of the tray of the present embodiment from below; Figure 9 Figure 15 is a schematic view of the tray of the present embodiment from above; Figure 7 Figure 16 is a cross-sectional view of the middle F-F of the tray of the present embodiment;

[0033] Figure 17 is a schematic view of the tray of the present embodiment from below; Figure 10 Figure 18 is a schematic view of the tray of the present embodiment from above; Figure 9 Figure 19 is a partial enlarged view at the middle G of the tray of the present embodiment;

[0034] Figure 20 is a schematic view of the tray of the present embodiment without the cover body from below; Figure 11 Figure 21 is a schematic view of the tray of the present embodiment without the cover body from above;

[0035] Figure 22 is a schematic view of the tray of the present embodiment without the cover body from below; Figure 12 Figure 23 is a partial enlarged view at the middle H of the tray of the present embodiment. Figure 11 In the above figures:

[0036] 1, bottom plate; 10, weight-reducing hole; 11, upper support body; 12, lower support body; 13, first groove; 130, through hole; 14, second groove;

[0037] 2, frame;

[0038] 3, positioning unit; 30, positioning assembly; 300, placement area; 301, positioning body; 302, cover body; 3021, support surface; 3022, limiting surface; 3023, guide surface; 303, connecting body;

[0039] 4, reinforcing assembly; 40, reinforcing rib.

[0040] DETAILED DESCRIPTION

[0041] ​The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] A tray, which can be used to load electronic components, such as chips, for example. As shown in Figure 1 and Figure 5 , the tray comprises a bottom plate 1, a frame 2 surrounding the four sides of the bottom plate 1, and a positioning unit 3 for supporting the chips, the positioning unit 3 being arranged on the bottom plate 1, the positioning unit 3 comprising a plurality of positioning assemblies 30, the plurality of positioning assemblies 30 being surrounded to form a placement area 300 for placing the chips.

[0044] The various components and their connection relationships will be described in detail below:

[0045] As shown in Figure 1 and Figure 5 , the bottom plate 1 is square, such as square, rectangular, etc., and in this embodiment, the bottom plate 1 is rectangular. The bottom plate 1 is provided with a weight-reducing hole 10, which penetrates the upper surface and the lower surface of the bottom plate 1. The weight-reducing hole 10 can be provided with multiple, and multiple weight-reducing holes 10 can be provided on the bottom plate 1 in the placement area 300, and multiple weight-reducing holes 10 can also be provided on the bottom plate 1 between the positioning assemblies 30 and the frame 2.

[0046] As shown in Figure 1 and Figure 3 , the frame 2 surrounds the four sides of the bottom plate 1, and the frame 2 protrudes from the upper surface and the lower surface of the bottom plate 1 to form a barrier. In addition, the four corners of the frame 2 also have rounded corners. When multiple trays are stacked, the frames 2 of adjacent two trays abut against each other.

[0047] As shown in Figure 2 and Figure 6As shown, the upper surface of the bottom plate 1 is provided with an upper support body 11, and / or the lower surface of the bottom plate 1 is provided with a lower support body 12. In this embodiment, the upper surface and the lower surface of the bottom plate 1 are respectively provided with the upper support body 11 and the lower support body 12. When multiple trays are stacked, the upper support body 11 of the tray in the lower layer is supported on the lower support body 12 of the tray in the upper layer. The upper support body 11 and the lower support body 12 not only serve as support when stacked, but also improve the overall strength of the tray, preventing the upper tray from deforming and pressing onto the chips placed on the lower tray.

[0048] As shown in Figure 1 and Figure 5 The upper support body 11 can be provided in multiple, and multiple upper support bodies 11 are distributed on the upper surface of the bottom plate 1. Specifically, two upper support bodies 11 distributed along the length direction of the bottom plate 1 form a pair, multiple pairs of upper support bodies 11 are evenly distributed along the length direction of the bottom plate 1, and multiple pairs of upper support bodies 11 are symmetrically arranged along the width direction of the bottom plate 1. The lower support body 12 is also provided in multiple, and multiple lower support bodies 12 are distributed on the lower surface of the bottom plate 1. The specific position and number of the lower support body 12 match those of the upper support body 11, which will not be described here. The shape of the upper support body 11 and the lower support body 12 can be strip-shaped, columnar, etc.

[0049] As shown in Figure 1 and Figure 5 The bottom plate 1 and the frame 2 are further provided with a reinforcing assembly 4 for improving the packaging force of the tray. Specifically, the reinforcing assembly 4 is provided in multiple, and multiple reinforcing assemblies 4 are distributed around the frame 2, that is, multiple reinforcing assemblies 4 are arranged between the upper surface of the bottom plate 1 and the frame 2, and multiple reinforcing assemblies 4 are also arranged between the lower surface of the bottom plate 1 and the frame 2; the reinforcing assembly 4 specifically includes a reinforcing rib 40 arranged between the bottom plate 1 and the frame 2. The reinforcing rib 40 can be provided in multiple, and multiple reinforcing ribs 40 are distributed in the horizontal direction. By arranging the reinforcing assembly 4, the packaging force of the tray can be improved, preventing the tray from deforming, such as arching and sagging, when gripped by a mechanical hand, which can cause damage to the chips.

[0050] As shown in Figure 1 and Figure 5 The positioning unit 3 is provided in multiple, and multiple positioning units 3 are distributed along the length direction of the bottom plate 1. The specific number of the positioning unit 3 can be 1-8. In this embodiment, the positioning unit 3 is provided in three, and the three positioning units 3 are distributed along the length direction of the bottom plate 1. Adjacent two positioning units 3 are separated from each other by structures protruding from the bottom plate 1.

[0051] Multiple positioning assemblies 30 are distributed on the upper surface of the bottom plate 1, and multiple positioning assemblies 30 enclose a placement area 300. In this embodiment, as shown in Figure 1 and Figure 5As shown, four positioning components 30 are provided, and the four positioning components 30 enclose the placement area 300 in four directions, that is, a square placement area 300 is formed between the four positioning components 30.

[0052] like Figure 3 and Figure 4 As shown, the positioning component 30 includes a positioning body 301, a cover 302, and a connecting body 303. The positioning body 301 and the connecting body 303 are disposed on the upper surface of the base plate 1. The cover 302 covers the positioning body 301 and is connected to the connecting body 303.

[0053] Specifically: such as Figure 2 and Figure 8 As shown, a first groove 13 is provided on the upper surface of the base plate 1. The first groove 13 is square, such as a square or rectangle. In this embodiment, the first groove 13 is rectangular. A positioning body 301 is disposed in the first groove 13. The positioning body 301 extends along the thickness direction of the base plate 1. The top of the positioning body 301 protrudes from the first groove 13, and the width of the top of the positioning body 301 is smaller than the width of its bottom. Multiple positioning bodies 301 can be provided, and the multiple positioning bodies 301 are distributed along the length direction of the first groove 13. In this embodiment, four positioning bodies 301 are provided. Two positioning bodies 301 form a pair, and there is a gap between a pair of positioning bodies 301. The two pairs of positioning bodies 301 are respectively distributed at both ends of the length direction of the first groove 13.

[0054] like Figure 8 and Figure 12 As shown, a through hole 130 is provided in the first groove 13, and the through hole 130 penetrates the bottom plate 1. Specifically, multiple through holes 130 are provided, and the multiple through holes 130 are distributed along the length direction of the first groove 13. The specific number of through holes 130 can be 1 to 4. In this embodiment, the through holes 130 are provided in the first groove 13 between the two pairs of positioning bodies 301; four through holes 130 are provided in the first groove 13 of the positioning component 30 provided along the width direction of the bottom plate 1, and the four through holes 130 are symmetrically arranged in pairs along the length direction of the first groove 13; two through holes 130 are provided in the first groove 13 of the positioning component 30 provided along the length direction of the bottom plate 1, and the two through holes 130 are symmetrically arranged along the length direction of the first groove 13.

[0055] Furthermore, in some embodiments, a second groove 14 is also formed within the first groove 13, and the through hole 130 extends into the second groove 14. In this embodiment: as shown... Figure 7 and Figure 8As shown, the second groove 14 extends along the length of the first groove 13 and is located within the first groove 13 between the two pairs of positioning bodies 301; at least part of the bottom surface of the first groove 13 protrudes from the lower surface of the base plate 1, that is, the bottom surface of the first groove 13 at the position corresponding to the second groove 14 protrudes from the lower surface of the base plate 1, which can ensure the depth of the first groove 13 and the second groove 14 and prevent the thickness of the base plate 1 from being too large, thus achieving the purpose of weight reduction.

[0056] like Figure 8 to Figure 10 As shown, the connector 303 is disposed on the upper surface of the base plate 1, and extends along the thickness direction of the base plate 1. The connector 303 is located on one side of the positioning body 301, and there is a gap between the connector 303 and the positioning body 301. The connector 301 and the placement area 200 are located on both sides of the positioning body 301. In this embodiment, two connectors 303 are provided, and the two connectors 303 are respectively disposed on the sides of two pairs of positioning bodies 301.

[0057] like Figure 2 and Figure 6 As shown, the cover 302 covers the surface of the positioning body 301 and the first groove 13, and the cover 302 passes through the through hole 130 and covers part of the lower surface of the base plate 1. Specifically, the portion of the cover 302 covering the surface of the positioning body 301 has a support surface 3021 and a limiting surface 3022. The support surface 3021 extends in the horizontal direction, and its height is higher than the upper surface of the base plate 1. The support surface 3021 can stably support the chip in the vertical direction. The limiting surface 3022 extends in the vertical direction and can limit the chip's displacement in the horizontal direction. The height of the cover 302 within the first groove 13 is slightly lower than the upper surface of the base plate 1. Since the first groove 13 also has a second groove 14, the cover 302 also covers the second groove 14. The second groove 14 increases the contact area of ​​the cover 302, further improving its connection strength. Figure 11 and Figure 12As shown, the cover body 302 covers the first groove 13, the second groove 14, passes through the through hole 130 and covers the lower surface of the bottom plate 1 at the edge of the through hole 130, that is, the size of the part of the cover body 302 extending out of the through hole 130 is slightly larger than the size of the through hole 130, forming an inverted structure, further improving the connection stability and preventing the cover body 302 from falling off; and the part of the cover body 302 extending out of the through hole 130 has a guide surface 3023, which extends obliquely in the up-down direction, that is, the guide surface 3023 is in the shape of an inverted cone, which can play a certain guiding role; the cover body 302 also covers the gap between the connecting body 303 and the positioning body 301, and the connection strength of the cover body 302 can be further improved by covering the gap. In addition, the inner wall of the first groove 13, the inner wall of the second groove 14, the inner wall of the through hole 130, the surface of the positioning body 301 and the surface of the connecting body 303 can all be set as rough wall surfaces with a grainy feel, which can enhance the friction between them and the cover body 302 and further improve the connection strength of the cover body 302.

[0058] The cover body 302 of the positioning unit 3 is integrally formed with the bottom plate 1 by two-color injection molding, which is easy to control the size, shortens the molding time, simplifies the process, and has high connection strength between the bottom plate 1 and the cover body 302 after molding.

[0059] The bottom plate 1, the frame 2, the positioning body 301 and the connecting body 303 of the positioning unit 3, and the reinforcing assembly 4 are made of the same material, which can all be hard glue, including MPPO, PAS, PPE, ABS, etc.; the bottom plate 1, the frame 2, the positioning body 301 and the connecting body 303 of the positioning unit 3, and the reinforcing assembly 4 are first formed by injection molding to ensure the overall strength of the tray.

[0060] The cover body 302 of the positioning unit 3 is made of soft glue, including TPU, TPE, silicone, etc., preferably TPU, which has good wear resistance, can be repeatedly used, and has the advantages of no chipping, etc.

[0061] After the bottom plate 1 is formed, the cover body 302 is formed on the positioning body 301, the first groove 13 and part of the bottom plate 1 by injection molding. Since the positioning assembly 30 is matched with the cover body 302 in an inverted manner, and the hard glue and the soft glue can be adsorbed and fused to a certain extent during injection molding, a bonding force is generated, so that the connection strength of the cover body 302 formed on the positioning body 301 and the bottom plate 1 is better, and there is no need for gluing.

[0062] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A tray comprising a base plate, characterised in that: The bottom plate is provided with a positioning unit for supporting a chip, the positioning unit comprises a plurality of positioning assemblies, the plurality of positioning assemblies are distributed on the upper surface of the bottom plate, and the plurality of positioning assemblies are surrounded to form a placement area; the upper surface of the bottom plate is provided with a first groove, a through hole is formed in the first groove, and the through hole penetrates the bottom plate; the positioning assembly comprises a positioning body and a cover body, the positioning body is formed in the first groove, the cover body is made of elastic material, the cover body covers the surface of the first groove and the positioning body, and the cover body penetrates the through hole and covers part of the lower surface of the bottom plate, the size of the part of the cover body extending out of the through hole is slightly larger than the size of the through hole, thereby forming an inverted structure, and the part of the cover body covering the surface of the positioning body has a supporting surface and a limiting surface, the supporting surface extends in the horizontal direction, the limiting surface extends in the vertical direction, and the height of the supporting surface is higher than the upper surface of the bottom plate.

2. The tray of claim 1, wherein: The material of the bottom plate and the positioning body is the same and is integrally formed; the bottom plate and the cover body are integrally formed by double-color injection molding.

3. The tray of claim 1, wherein: The material of the bottom plate is selected from MPPO, PAS, PPE and ABS; The material of the cover body is selected from TPU, TPE and silica gel.

4. The tray of claim 1, wherein: The height of the cover body in the first groove is lower than the upper surface of the bottom plate.

5. The tray of claim 1, wherein: The positioning assembly further comprises a connecting body, the connecting body is arranged on the upper surface of the bottom plate on one side of the positioning body, the connecting body and the placement area are respectively located on the two sides of the positioning body, and the cover body covers between the connecting body and the positioning body.

6. The tray of claim 1, wherein: A second groove is further formed in the first groove, and the through hole extends to the second groove.

7. The tray of claim 6, wherein: At least part of the bottom surface of the first groove is protruded from the lower surface of the bottom plate.

8. The tray of claim 1, wherein: The plurality of positioning assemblies surround the placement area in four directions.

9. The tray of claim 1, wherein: The positioning body is provided in plurality, and the plurality of positioning bodies are distributed along the length direction of the first groove; the width of the top of the positioning body is smaller than the width of the bottom.

10. The tray of claim 1, wherein: The through hole is provided in plurality, and the plurality of through holes are distributed along the length direction of the first groove.

11. The tray of claim 10, wherein: The number of the through hole is 1-4.

12. The tray of claim 1, wherein: The upper surface of the bottom plate is provided with an upper supporting body, when the trays are stacked, the upper supporting body of the tray in the lower layer is supported on the lower surface of the tray in the upper layer.

13. The tray of claim 12, wherein: The lower surface of the bottom plate is provided with a lower supporting body, when the trays are stacked, the upper supporting body of the tray in the lower layer is supported on the lower supporting body of the tray in the upper layer.

14. The tray of claim 1, wherein: A plurality of weight-reducing holes are arranged on the bottom plate, and the weight-reducing holes penetrate the bottom plate.

15. The tray of claim 1, wherein: The tray further comprises a frame, the frame surrounds the periphery of the bottom plate, and the tray further comprises a reinforcing assembly, the reinforcing assembly comprises a reinforcing rib, and the reinforcing rib is arranged between the bottom plate and the frame.

16. The tray of claim 1, wherein: The positioning units are arranged in multiple numbers, and the multiple positioning units are distributed along the length direction of the bottom plate.

17. The tray of claim 16, wherein: The number of the positioning units is 1-8.

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