Wafer buffer structure and cover body provided with same

Abstract

The utility model relates to the technical field of semiconductor wafer storage, in particular to a wafer buffer structure and a cover body provided with the same. The wafer buffer structure comprises a first fixing plate, a second fixing plate and a buffer strip, first limiting parts and second limiting parts are arranged at intervals in the transverse direction of the buffer strip, and the first limiting part is further arranged between the two symmetrical second limiting parts, that is, the first limiting part is arranged between the buffer strip. The extrusion force between the first limiting part and the top end of the wafer is the maximum, so that a better limiting and fixing effect is achieved, the wafer is not prone to shaking, under the guiding effect of the limiting inclined face of the first limiting part, better positioning can be achieved, the wafer is not prone to deflection, the wafer can be conveniently guided into the second limiting parts on the two sides, and then the wafer can be conveniently clamped. And the wafer is stably kept in the first limiting part and the second limiting part, so that shaking or displacement caused by sudden vibration in the transportation process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor wafer storage, in particular to a wafer buffer structure and a cover body for installing the same. Background Art

[0002] A wafer box is a container used in the semiconductor manufacturing process to protect, transport, and store wafers. A buffer structure is provided on the front-opening box cover to limit and cushion the wafers. When the box cover is buckled, the buffer structure is squeezed by the wafers and produces a certain degree of elastic deformation. The elastic force fixes the wafers, preventing them from moving up and down or shaking and causing damage, allowing the wafers to be placed more stably in the wafer box.

[0003] At present, the buffer structure usually uses a symmetrical limiting method to limit the wafer, for example, two or four, etc. This setting method will cause insufficient extrusion force and poor limiting and fixing effect. Moreover, since the limiting parts are symmetrical on both sides, during the closing process of the box cover, the wafer is first inserted into the grooves of the two closest limiting parts. This two-point limiting will inevitably cause the wafer to skew, and the horizontality and stability of the wafer cannot be well guaranteed. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, thereby providing a wafer buffer structure and a cover body for installing the same.

[0005] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0006] The utility model provides a wafer buffer structure, comprising:

[0007] A first fixing plate and a second fixing plate, wherein the first fixing plate and the second fixing plate are arranged in parallel and spaced apart;

[0008] A buffer bar, wherein the buffer bars are multiple and are evenly spaced along the longitudinal direction of the first fixing plate and the second fixing plate, and the two ends of the buffer bar are respectively connected to the first fixing plate and the second fixing plate; a first limiting portion and a second limiting portion are spaced apart along the lateral direction of the buffer bar; wherein:

[0009] The first limiting portion is located at the transverse midline of the buffer strip, the first limiting portion comprises a limiting member 1 and a limiting member 2, the limiting member 1 comprises a first limiting inclined surface, the limiting member 2 comprises a second limiting inclined surface, the first limiting inclined surface and the second limiting inclined surface are arranged opposite to each other, and a first angle is formed between the first limiting inclined surface and the second limiting inclined surface;

[0010] There are two second limiting parts, and the two second limiting parts are symmetrically arranged on both sides of the first limiting part. The second limiting part has a limiting component three and a limiting component four. The limiting component three has a third limiting slope, and the limiting component four has a fourth limiting slope. The third limiting slope and the fourth limiting slope are arranged opposite to each other, and a second angle is formed between the third limiting slope and the fourth limiting slope.

[0011] Optionally, in the above wafer buffer structure, both ends of the buffer bar have vertical extension parts extending toward the first fixing plate and the second fixing plate, respectively, and the ends of the two vertical extension parts are connected to the first fixing plate and the second fixing plate, respectively.

[0012] Optionally, in the above-mentioned wafer buffer structure, the buffer strip is further provided with a third limiting portion in its lateral direction, and there are two third limiting portions, which are respectively located on the side of the second limiting portion away from the first limiting portion and are symmetrically arranged relative to the first limiting portion, and the third limiting portion has a limiting member five and a limiting member six, the limiting member five has a fifth limiting slope, and the limiting member six has a sixth limiting slope, the fifth limiting slope and the sixth limiting slope are arranged opposite to each other, and a third angle is formed between the fifth limiting slope and the sixth limiting slope.

[0013] Optionally, in the above wafer buffer structure, the first angle, the second angle, and the third angle have the following relationship: first angle ≥ second angle > third angle.

[0014] Optionally, in the above wafer buffer structure, the first fixing plate, the second fixing plate and the buffer bar are integrally formed.

[0015] The utility model also provides a cover body for installing a wafer buffer structure, and the wafer buffer structure is installed on the inner wall of the cover body.

[0016] Optionally, the first fixing plate and the second fixing plate have a side facing away from the buffer strip that has an outwardly protruding clip extension portion, and the clip extension portions are multiple and are spaced apart longitudinally along the first fixing plate and the second fixing plate.

[0017] Optionally, the cover body has an installation cavity, the installation cavity is suitable for accommodating the buffer strip, and the side wall of the installation cavity has a plurality of snap-fitting protrusions, and the snap-fitting protrusions cooperate with the snap-fitting extension portion.

[0018] Optionally, the back side of the first fixing plate is provided with a plurality of transversely extending first ribs, and the back side of the second fixing plate is provided with a plurality of transversely extending second ribs; wherein a first slot is formed between at least two adjacent first ribs, and a second slot is formed between at least two adjacent second ribs.

[0019] Optionally, in the above-mentioned cover body, the installation cavity has a plurality of longitudinal support ribs and a plurality of transverse support ribs; the transverse support ribs have a middle rib corresponding to the buffer strip, and two side ribs corresponding to the first fixing plate and the second fixing plate respectively; the longitudinal support ribs and the middle ribs are staggered with each other; the side ribs are staggered in position with the first convex rib and the second convex rib and have the same height, wherein at least two of the side ribs cooperate with the first card slot and the second card slot respectively.

[0020] The technical solution of the utility model has the following advantages:

[0021] Compared with the symmetrical limiting structure in the prior art, the wafer buffer structure provided by the utility model further has a first limiting portion in the middle of the two symmetrical second limiting portions, that is, the first limiting portion is set in the middle of the buffer strip, and the contact point between the first limiting portion and the wafer is the top of the wafer. Therefore, the extrusion force at the top position is the largest, and a more stable extrusion can be formed than limiting at the non-top position, which has a better limiting and fixing effect, and the wafer is less likely to shake. Under the guiding effect of the limiting inclined surface of the first limiting portion, better positioning can be achieved, and the wafer is not easy to deflect, which facilitates the wafer to be introduced into the second limiting portions on both sides. Furthermore, the wafer is stably maintained in the first limiting portion and the second limiting portion, avoiding shaking or displacement due to sudden vibration during transportation.

[0022] The wafer buffer structure and cover body provided by the utility model are provided with a clamping protrusion on the cover body, and a clamping extension portion is provided on the first fixing plate and the second fixing plate, the clamping protrusion cooperates with the clamping extension portion to clamp and fix the buffer strip; a plurality of longitudinal support ribs and a plurality of transverse support ribs are provided in the installation cavity of the cover body, which support the buffer strip and avoid excessive deformation of the buffer strip due to external force; wherein the side ribs at both ends of the transverse support ribs also cooperate with the convex ribs on the back of the first fixing plate and the second fixing plate to achieve clamping, effectively avoiding the shaking of the buffer strip and ensuring the stable placement of the wafer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is an overall schematic diagram of the wafer buffer structure provided in an embodiment of the utility model being installed on a cover body;

[0025] Figure 2 It is a front schematic diagram of a wafer buffer structure provided in an embodiment of the utility model;

[0026] Figure 3 A partial schematic diagram of the wafer buffer structure provided in the embodiment of the utility model Figure 1 ;

[0027] Figure 4 Partial schematic diagram of the wafer buffer structure provided in this embodiment Figure 2 ;

[0028] Figure 5 A schematic diagram of a cover provided in an embodiment of the utility model;

[0029] Figure 6 It is a schematic back view of the wafer buffer structure provided in an embodiment of the present utility model.

[0030] Description of reference numerals:

[0031] 1-wafer buffer structure, 11-first fixing plate, 111-first convex rib, 112-first card slot, 12-second fixing plate, 121-second convex rib, 122-second card slot, 13-buffer strip, 131-vertical extension portion, 14-first limiting portion, 141-limiting member 1, 142-limiting member 2, 15-second limiting portion, 151-limiting member 3, 152-limiting member 4, 16-third limiting portion, 161-limiting member 5, 162-limiting member 6;

[0032] 2-cover body, 21-installation cavity, 22-clamping protrusion, 23-longitudinal support rib, 24-transverse support rib, 241-middle rib, 242-side rib. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Example 1

[0037] This embodiment provides a wafer buffer structure, such as Figure 1 As shown, the wafer buffer structure 1 is located on the front-opening cover body 2 of the wafer box. When the cover body 2 is buckled on the wafer box from the front, the wafers placed in the wafer box at intervals are abutted against the limiting structure of the wafer buffer structure. Since the wafer buffer structure itself has a certain elasticity, the wafer buffer structure can undergo a certain elastic deformation when the wafers are abutted. The elastic deformation force can buffer and limit the wafers, keep the wafers stable, and avoid damage caused by up and down movement or shaking of the wafers.

[0038] The wafer buffer structure 1 provided in this embodiment is as follows: Figure 2-3As shown, it includes a first fixing plate 11 and a second fixing plate 12, the first fixing plate 11 and the second fixing plate 12 are arranged in parallel and spaced apart; a plurality of buffer strips 13 are arranged between the first fixing plate 11 and the second fixing plate 12, the plurality of buffer strips 13 are evenly spaced apart along the longitudinal direction of the first fixing plate 11 and the second fixing plate 12, and the two ends of the buffer strips 13 are respectively connected to the first fixing plate 11 and the second fixing plate 12; optionally, each buffer strip can correspond to a wafer, and the material of the buffer strip can be selected from high temperature resistant and wear resistant plastics, such as PEEK or PEI; optional Preferably, the first fixing plate 11, the second fixing plate 12 and the buffer bar 13 are integrally formed, specifically, they can be integrally injection molded, the integral injection molded parts are simple to manufacture, and convenient to install and replace; both ends of the buffer bar 13 respectively have vertical extensions 131 extending toward the first fixing plate 11 and the second fixing plate 12, and the ends of the two vertical extensions 131 are respectively connected to the first fixing plate 11 and the second fixing plate 12, by providing the vertical extensions 131, the buffer bar 13 can produce a certain elastic deformation in the abutting direction of the wafer to ensure the buffering effect; optionally, as Figure 2-3 As shown, the vertical extension portion 131 transitions to the transverse portion of the buffer strip 13 through an arc segment.

[0039] The wafer buffer structure provided in this embodiment is as follows: Figure 2-4As shown, along the lateral direction of the buffer strip 13, that is, on the lateral part of the buffer strip 13, a first limiting portion 14 and a second limiting portion 15 are arranged at intervals; wherein, the first limiting portion 14 is located at the lateral midline of the buffer strip 13, the first limiting portion 14 has a limiting member 141 and a limiting member 2 142, the limiting member 141 has a first limiting inclined surface, the limiting member 2 142 has a second limiting inclined surface, the first limiting inclined surface and the second limiting inclined surface are arranged opposite to each other The first limiting slope is arranged so that a first angle is formed between the first limiting slope and the second limiting slope; two second limiting portions 15 are symmetrically arranged on both sides of the first limiting portion 14, the second limiting portion 15 has a limiting member 3 151 and a limiting member 4 152, the limiting member 3 151 has a third limiting slope, the limiting member 4 152 has a fourth limiting slope, the third limiting slope and the fourth limiting slope are arranged opposite to each other, and a second angle is formed between the third limiting slope and the fourth limiting slope. Compared with the prior art which only adopts a symmetrical limiting structure of, for example, two second limiting parts 15, this embodiment further provides a first limiting part 14 in the middle of the two symmetrical second limiting parts 15, that is, the first limiting part 14 is provided in the middle of the buffer strip 13, and the contact point between the first limiting part 14 and the wafer is the top of the wafer. Therefore, the extrusion force at the top position is the largest, which can form a more stable extrusion than limiting at the non-top position, and has a better limiting and fixing effect. The wafer is less likely to shake, and under the guiding effect of the limiting inclined surface of the first limiting part, better positioning can be achieved, the wafer is not easy to deflect, and it is convenient for the wafer to be introduced into the second limiting parts on both sides. Furthermore, the wafer is stably maintained in the first limiting part and the second limiting part, avoiding shaking or displacement due to sudden vibration during transportation.

[0040] The wafer buffer structure provided in this embodiment is as follows: Figure 2-4As shown, a third limiting portion 16 is also provided on the transverse portion of the buffer strip 13. The third limiting portion 16 is two and is respectively located on the side of the second limiting portion 15 away from the first limiting portion 14 and is symmetrically arranged relative to the first limiting portion 14. The third limiting portion 16 has a limiting member 5 161 and a limiting member 6 162. The limiting member 5 161 has a fifth limiting slope, and the limiting member 6 162 has a sixth limiting slope. The fifth limiting slope and the sixth limiting slope are arranged opposite to each other, and a third angle is formed between the fifth limiting slope and the sixth limiting slope. In this embodiment, a symmetrical third limiting portion 16 is further provided on the basis of the first limiting portion 14 and the second limiting portion 15, which has a better limiting effect and further ensures the stability of wafer placement. Those skilled in the art should understand that, due to the circular shape of the wafer, the first limiting portion 14 and the second limiting portion 15 mentioned above mainly play a limiting role on the wafer, and only a small part of the wafer will be limited in the third limiting portion 16. The third limiting portion 16 plays an auxiliary limiting role on the wafer.

[0041] The wafer buffer structure provided in this embodiment is as follows: Figure 4 As shown, the first angle of the first limiting portion 14, the second angle of the second limiting portion 15, and the third angle of the third limiting portion 16 have the following relationship: first angle ≥ second angle > third angle. As mentioned above, the first limiting portion 14 and the second limiting portion 15 mentioned above mainly play a limiting role on the wafer. By designing the first angle and the second angle to be larger, the inclinations of the first limiting bevel, the second limiting bevel, the third limiting bevel and the fourth limiting bevel are larger, which makes it easier for the wafer to be supported against the buffer strip at the bottom of each limiting bevel under the guidance of the first limiting bevel, the second limiting bevel, the third limiting bevel and the fourth limiting bevel; optionally, due to the core limiting role of the first limiting portion 14, the first angle can be equal to the second angle, or can be greater than the second angle; and for the third limiting portion 16 that serves as an auxiliary limit for the wafer, since the wafer is better limited in the first limiting portion 14 and the second limiting portion 15 and is easy to be supported in the third limiting portion 16, the third angle can be relatively small, which can also avoid the shaking of the wafer to a certain extent.

[0042] Example 2

[0043] Based on the wafer buffer structure of Example 1, this embodiment provides a cover body, and the wafer buffer structure is installed on the inner wall of the cover body.

[0044] like Figure 2-3As shown, the first fixing plate 11 and the second fixing plate 12 have a snap-in extension protruding outward on one side away from the buffer strip 13 . There are a plurality of snap-in extensions, which are arranged at intervals along the longitudinal direction of the first fixing plate 11 and the second fixing plate 12 .

[0045] Combination Figure 1 and Figure 5 The buffer strip 13 is mounted on the cover body 2. The cover body 2 has a mounting cavity 21. The mounting cavity 21 is suitable for accommodating the buffer strip 13. The side wall of the mounting cavity 21 has a plurality of snap-fitting protrusions 22. The snap-fitting protrusions 22 cooperate with the snap-fitting extension. The snap-fitting protrusions cooperate with the snap-fitting extension to snap-fit ​​the buffer strip. The snap-fitting fixing method has a simple structure and is convenient for installation and replacement.

[0046] like Figure 6 As shown, the back of the first fixing plate 11 is provided with a plurality of transversely extending first ribs 111, and the back of the second fixing plate 12 is provided with a plurality of transversely extending second ribs 121; wherein a first slot is formed between at least two adjacent first ribs, and a second slot is formed between at least two adjacent second ribs; specifically, see Figure 6 Among all the buffer strips 13, except for the first buffer strip 132 located in the middle, each of the remaining buffer strips 13 corresponds to a first convex rib 111 and a second convex rib 121, which helps to improve the strength of each buffer strip and prevent the first fixing plate 11 or the second fixing plate 12 from being squeezed and collapsed at the buffer strip; for the first buffer strip 132, two first convex ribs 111 and two second convex ribs 121 are correspondingly provided at its position, the two first convex ribs 111 and the two second convex ribs 121 are respectively adjacent to and symmetrical to the first buffer strip 132, a first card groove 112 is formed between the two first convex ribs, and a second card groove 122 is formed between the two second convex ribs; of course, according to the specific needs of the clamping, the number of the first card groove and the second card groove can be more than two, and can also be provided corresponding to the buffer strips at other positions.

[0047] The cover provided in this embodiment is as follows Figure 5 As shown, a plurality of longitudinal support ribs 23 and a plurality of transverse support ribs 24 are provided in the installation cavity 21 of the cover body 2; the transverse support ribs 24 have a middle section rib corresponding to the buffer strip 13, and two side ribs 242 corresponding to the first fixing plate 11 and the second fixing plate 12 respectively; the longitudinal support ribs 23 and the middle section ribs 241 are interlaced with each other. Specifically, as Figure 5As shown, two longitudinal support ribs 23 and eleven transverse support ribs 24 are provided in the installation cavity 21 of the cover body 2. The transverse support ribs 24 have a middle section rib 241 corresponding to the buffer strip 13. The middle section rib 241 and the longitudinal support ribs 23 are staggered with each other to provide back support for the buffer strip 13 to improve the strength. The transverse support rib 24 also has side ribs 242 located on both sides of the middle section rib 241. The side ribs 242 on both sides correspond to the first fixing plate 11 and the second fixing plate 12 respectively. The height of the middle section rib 241 is higher than the height of the side rib 242. The middle section rib 241 and the side rib 242 are smoothly connected by an arc. The side ribs 242 are staggered with the first convex rib 111 and the second convex rib 121 and have the same height, so that when the buffer strip 13 is snapped into the installation cavity 21, the side ribs 242 can abut against the first fixing plate 11 and the second fixing plate 12, and the first convex rib 111 and the second convex rib 121 can abut against the bottom wall of the installation cavity 21, thereby making the buffer strip 13 stable in the height direction without shaking; and at least two of the side ribs are respectively matched with the first card slot and the second card slot, that is, some of the side ribs can be snap-fitted with the first card slot and the second card slot. Specifically, in combination with Figure 5-6 It can be seen that the two side ribs 242 corresponding to the middle transverse support rib 24 are respectively engaged with the first card slot 112 and the second card slot 122, thereby limiting the longitudinal displacement of the buffer strip, and the buffer strip will not swing back and forth in the longitudinal direction, which further ensures the stable placement of the wafer and prevents the wafer from being damaged. Of course, as mentioned above, the number of the first card slot and the second card slot can be one, two or even more, and can be set according to the specific card connection needs. Accordingly, the number of side ribs can also be set adaptively.

[0048] The wafer buffer structure and cover body provided in the present embodiment have a first limiting portion arranged in the middle of two symmetrical second limiting portions, so that the maximum squeezing force is obtained at the top of the wafer, the limiting and fixing effect is better, and the wafer is less likely to shake, thereby making it easier to introduce the wafer into the second limiting portions on both sides, and then the wafer is stably held in the first limiting portion and the second limiting portion; and, the buffer bar and the cover body are provided with snap-fitting structures at multiple positions, so that the buffer bar will not shake in all dimensional directions, thereby ensuring the stable placement of the wafer.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A wafer buffer structure, characterized in that: include: A first fixing plate and a second fixing plate, wherein the first fixing plate and the second fixing plate are arranged in parallel and spaced apart; A buffer bar, wherein the buffer bars are multiple and are evenly spaced along the longitudinal direction of the first fixing plate and the second fixing plate, and the two ends of the buffer bar are respectively connected to the first fixing plate and the second fixing plate; a first limiting portion and a second limiting portion are spaced apart along the lateral direction of the buffer bar; wherein: The first limiting portion is located at the transverse midline of the buffer strip, the first limiting portion comprises a limiting member 1 and a limiting member 2, the limiting member 1 comprises a first limiting inclined surface, the limiting member 2 comprises a second limiting inclined surface, the first limiting inclined surface and the second limiting inclined surface are arranged opposite to each other, and a first angle is formed between the first limiting inclined surface and the second limiting inclined surface; There are two second limiting parts, and the two second limiting parts are symmetrically arranged on both sides of the first limiting part. The second limiting part has a limiting component three and a limiting component four. The limiting component three has a third limiting slope, and the limiting component four has a fourth limiting slope. The third limiting slope and the fourth limiting slope are arranged opposite to each other, and a second angle is formed between the third limiting slope and the fourth limiting slope.

2. The wafer buffer structure according to claim 1, characterized in that: Both ends of the buffer strip have vertical extension portions extending toward the first fixing plate and the second fixing plate, respectively. Ends of the two vertical extension portions are connected to the first fixing plate and the second fixing plate, respectively.

3. The wafer buffer structure according to claim 1, characterized in that: The buffer strip is also provided with a third limiting portion in its transverse direction. There are two third limiting portions, which are respectively located on the side of the second limiting portion away from the first limiting portion and are symmetrically arranged relative to the first limiting portion. The third limiting portion has a limiting member five and a limiting member six. The limiting member five has a fifth limiting slope, and the limiting member six has a sixth limiting slope. The fifth limiting slope and the sixth limiting slope are arranged opposite to each other, and a third angle is formed between the fifth limiting slope and the sixth limiting slope.

4. The wafer buffer structure according to claim 3, characterized in that: The first angle, the second angle, and the third angle have the following relationship: first angle ≥ second angle > third angle.

5. The wafer buffer structure according to claim 1, characterized in that: The first fixing plate, the second fixing plate and the buffer strip are integrally formed.

6. A cover body for mounting a wafer buffer structure, characterized in that: The wafer buffer structure according to any one of claims 1 to 5 is installed on the inner wall of the cover.

7. The cover according to claim 6, characterized in that: The first fixing plate and the second fixing plate have a clamping extension portion protruding outward on one side away from the buffer strip. There are a plurality of clamping extension portions, which are spaced apart in the longitudinal direction of the first fixing plate and the second fixing plate.

8. The cover according to claim 7, characterized in that: The cover body has an installation cavity, which is suitable for accommodating the buffer strip. The side wall of the installation cavity has a plurality of clamping protrusions, which are matched with the clamping extension part.

9. The cover according to claim 8, characterized in that: The back of the first fixing plate is provided with a plurality of transversely extending first ribs, and the back of the second fixing plate is provided with a plurality of transversely extending second ribs; wherein a first slot is formed between at least two adjacent first ribs, and a second slot is formed between at least two adjacent second ribs.

10. The cover according to claim 9, characterized in that: The installation cavity is provided with a plurality of longitudinal support ribs and a plurality of transverse support ribs; the transverse support ribs have a middle section rib corresponding to the buffer strip, and two side ribs corresponding to the first fixing plate and the second fixing plate respectively; the longitudinal support ribs and the middle section ribs are staggered with each other; the side ribs are staggered in position with the first convex rib and the second convex rib and have the same height, wherein at least two of the side ribs are respectively matched with the first card slot and the second card slot.

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