Battery tray

Abstract

The utility model discloses a battery tray which comprises a tray body. The at least two first limiting devices are arranged on the surface of the tray body, each first limiting device comprises a first adjusting assembly, and the at least two first adjusting assemblies are arranged at the two ends of each first limiting device in a sliding mode correspondingly, so that the two first adjusting assemblies can get close to or get away from each other in the first direction; the second limiting devices are arranged on the surface of the tray body and located on the two sides of the first limiting device respectively, each second limiting device comprises two limiting pieces, and the limiting pieces extend in the first direction and can be close to or away from the first limiting device in the second direction. The battery tray provided by the embodiment of the utility model can be used for clamping batteries with different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery tray. Background Art

[0002] During the manufacturing process of the battery, the battery module needs to be clamped and fixed on a work station so as to process the battery module.

[0003] During the production process, battery modules of different sizes need to be processed, but the clamping device in the prior art does not have the function of adjusting according to the battery size, or the adjustment range of the clamping device is limited and can only be adjusted in one direction, making it difficult to be compatible with battery modules of different sizes. In order to meet production needs, it is often necessary to prepare multiple clamping devices to be compatible with battery modules of different sizes, resulting in excessively high production costs. Utility Model Content

[0004] The embodiment of the utility model provides a battery tray capable of clamping batteries of different sizes.

[0005] In a first aspect, an embodiment of the utility model provides a battery tray, which comprises: a tray body; at least two first limiting devices, which are arranged on the surface of the tray body, and the first limiting device comprises a first adjusting component, and at least two first adjusting components are respectively slidably arranged at two ends of the first limiting device, so that the two first adjusting components can approach or move away from each other along a first direction; at least two second limiting devices, which are arranged on the surface of the tray body and are respectively located on both sides of the first limiting device, and the second limiting device comprises two limiting members, which extend along the first direction and can approach or move away from the first limiting device along the second direction.

[0006] The tray body of the battery tray of the utility model embodiment is used for placing batteries. When the batteries are placed on the tray body, the first adjustment components of the two first limiting devices are located on both sides of the batteries along the first direction. By controlling the two first adjustment components to approach or move away from each other, the two ends of the battery along the first direction can be clamped. The second limiting members of the two second limiting devices are located on both sides of the battery along the second direction. By moving the two second limiting members closer to or away from each other, the two ends of the battery along the second direction can be limited to the tray body. By adjusting the first limiting device and the second limiting device, the battery tray of the utility model embodiment can be compatible with battery modules of different sizes.

[0007] Optionally, the first limiting device further includes a first guide rail and a first slider, the first adjustment assembly is connected to the first slider, the first slider is slidably disposed on the first guide rail, and the first guide rail extends along the first direction.

[0008] Optionally, the first adjustment component includes a supporting portion and a clamping portion, the supporting portion is parallel to the surface of the tray body, the clamping portion is perpendicular to the supporting portion, and the clamping portion is located on the side of the supporting portion away from the tray body, and the surface of the supporting portion close to the tray body is connected to the first slider; the clamping portions of the first adjustment component located at both ends of the first limiting device can respectively abut against the two ends of the battery when they are close to each other.

[0009] Optionally, the first adjustment component also includes a limiter, which is arranged on the support part and faces the first guide rail, and the limiter is movably connected to the first guide rail; when the limiter is separated from the first guide rail, the first adjustment component can reciprocate along the first guide rail, and when the limiter is connected to the first guide rail, the first adjustment component is limited to the first guide rail.

[0010] Optionally, the second limiting device further includes two second adjusting components, which are respectively arranged at two ends of the limiting member and connected to the limiting member, and the second adjusting components can drive the limiting member to move closer to or away from the tray body.

[0011] Optionally, the second adjustment component includes a support seat, a second guide rail and a second slider, the support seat is connected to the second slider, the second slider is slidably set on the second guide rail, the second guide rail is set on the surface of the tray body and extends along the second direction, so that the support seat can reciprocate along the second direction; the two ends of the limit member are respectively connected to the support seat of the corresponding second adjustment component.

[0012] Optionally, the second adjustment component also includes an elastic member, a lifting member and a support block, the lifting member is slidably arranged on the support seat, the support block is detachably arranged on the surface of the tray body, one end of the elastic member is connected to the lifting member, the other end is connected to the support block, and the limit member is connected to the lifting member; the lifting member can approach or move away from the tray body along a third direction, so that the limit member approaches or moves away from the battery, and the elastic member is configured to apply an elastic force toward the tray body to the lifting member, so that the limit member abuts against the surface of the battery, and the third direction is perpendicular to the surface of the tray body.

[0013] Optionally, the lifting assembly includes a first fixed plate, a second fixed plate and a driving member, the second fixed plate is slidably connected to the support seat; the surfaces of the first fixed plate and the second fixed plate are arranged opposite to each other, the driving member is arranged on the surface of the second fixed plate facing the first fixed plate and the telescopic end of the driving member is telescopically connected to the first fixed plate along a third direction.

[0014] Optionally, the first fixed plate is located at an end of the driving member away from the tray body, the second fixed plate is located at an end of the driving member close to the tray body, one end of the elastic member abuts against the second fixed plate, and the other end abuts against the support block, and the limit member is connected to the first fixed plate; the driving member can drive the first fixed plate to reciprocate relative to the support seat along a third direction, so that the limit member abuts against or is spaced from the battery.

[0015] Optionally, the surface of the limiting member facing the tray body has an uneven tooth-like structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the battery tray of the utility model;

[0018] Figure 2 A schematic top view of an embodiment of a battery tray of the utility model;

[0019] Figure 3 It is a partial enlarged view of an embodiment of the battery tray of the utility model;

[0020] Figure 4 This is a schematic structural diagram of a second adjustment component of an embodiment of a battery tray of the utility model.

[0021] Description of Figure Numbers:

[0022] 100-tray body;

[0023] 200-first limiting device; 210-first adjusting assembly; 211-supporting portion; 212-clamping portion; 213-limiter; 220-first guide rail; 230-first slider;

[0024] 300-second limit device;

[0025] 310 - second adjustment assembly; 311 - support seat; 312 - second guide rail; 313 - second slider; 314 - elastic member;

[0026] 315-lifting assembly; 3151-first fixing plate; 3152-second fixing plate; 3153-driving member; 3154-first fixing member; 3155-second fixing member; 3156-connecting member;

[0027] 316-support block;

[0028] 320-limiting piece;

[0029] X-first direction; Y-second direction; Z-third direction.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] 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. 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.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] Figure 1 It is a structural schematic diagram of an embodiment of the battery tray of the utility model; Figure 2 A schematic top view of an embodiment of a battery tray of the utility model; Figure 3 It is a partial enlarged view of an embodiment of a battery tray of the utility model. In the embodiment of the utility model, the battery tray includes a tray body 100, at least two first limiting devices 200 and at least two second limiting devices 300.

[0035] The first limiting device 200 is disposed on the surface of the tray body 100, and the first limiting device 200 includes a first adjustment component 210. At least two first adjustment components 210 are slidably disposed at both ends of the first limiting device 200, so that the two first adjustment components 210 can approach or move away from each other along the first direction X. The second limiting device 300 is disposed on the surface of the tray body 100 and is located at both sides of the first limiting device 200. The second limiting device 300 includes two limiting members 320. The limiting members 320 extend along the first direction X and can approach or move away from the first limiting device 200 along the second direction Y.

[0036] In an embodiment of the utility model, the first adjustment component 210 is slidably disposed on the surface of the tray body 100 and can reciprocate along the first direction X, and the limiting member 320 of the second limiting device 300 can reciprocate along the second direction Y relative to the tray body 100. The battery tray of this embodiment can control the spacing between the two first adjustment components 210 so that the two first adjustment components 210 can clamp batteries of different lengths. The battery tray of this embodiment can also control the spacing between the limiting members 320 of the two second limiting devices 300 so that the two limiting members 320 can limit batteries of different widths. Through the two first limiting devices 200 and the two second limiting devices 300 of this embodiment, batteries of different lengths and widths can be clamped on the surface of the tray body 100, thereby achieving compatibility with batteries of different sizes.

[0037] The tray body 100 of the battery tray of the utility model embodiment is used to place batteries. When the batteries are placed on the tray body 100, the first adjustment components 210 of the two first limiting devices 200 are located on both sides of the battery along the first direction X. By controlling the two first adjustment components 210 to approach or move away from each other, the two ends of the battery along the first direction X can be clamped. The second limiting members 320 of the two second limiting devices 300 are located on both sides of the battery along the second direction Y. By moving the two second limiting members 320 closer to or away from each other, the two ends of the battery along the second direction Y can be limited to the tray body 100. By adjusting the first limiting devices 200 and the second limiting devices 300, the battery tray of the utility model embodiment can be compatible with battery modules of different sizes.

[0038] In some embodiments, the first limiting device 200 further includes a first guide rail 220 and a first slider 230 . The first adjustment assembly 210 is connected to the first slider 230 . The first slider 230 is slidably disposed on the first guide rail 220 . The first guide rail 220 extends along the first direction X.

[0039] In an embodiment of the utility model, two first guide rails 220 are arranged on the surface of the tray body 100 along the first direction X, and multiple first sliders 230 are respectively arranged on the corresponding first guide rails 220. Two first adjustment components 210 are slidably set on the first guide rails 220 through the first sliders 230, and the two first adjustment components 210 are arranged relative to each other, so that the battery tray of this embodiment can clamp the two ends of the battery along the first direction X by controlling the spacing between the two first adjustment components 210, thereby realizing the compatibility of the battery tray with batteries of different lengths.

[0040] In some embodiments, the first adjustment assembly 210 includes a support portion 211 and a clamping portion 212. The support portion 211 is parallel to the surface of the tray body 100, the clamping portion 212 is perpendicular to the support portion 211, and the clamping portion 212 is located on a side of the support portion 211 away from the tray body 100, and the support portion 211 is connected to the first slider 230 on the surface close to the tray body 100.

[0041] The clamping parts 212 of the first adjustment assembly 210 located at two ends of the first limiting device 200 can respectively abut against two ends of the battery when they are close to each other.

[0042] In this embodiment, two second limiting devices 300 are disposed on both sides of the first guide rail 220, so that a limiting member 320 is provided on each side of the first limiting device 200, and the limiting member 320 can reciprocate relative to the surface of the tray body 100 along the second direction Y. The second direction Y is perpendicular to the first direction X.

[0043] The battery tray of this embodiment can control the two limiting members 320 to move closer or farther away, so that the limiting members 320 can limit the two ends of the battery along the second direction Y, thereby achieving compatibility of the battery tray with batteries of different widths.

[0044] In some embodiments, the first adjustment assembly 210 further includes a stopper 213 . The stopper 213 is disposed on the support portion 211 and faces the first guide rail 220 , and the stopper 213 is movably connected to the first guide rail 220 .

[0045] When the stopper 213 is separated from the first guide rail 220 , the first adjustment assembly 210 can reciprocate along the first guide rail 220 . When the stopper 213 is connected to the first guide rail 220 , the first adjustment assembly 210 is confined to the first guide rail 220 .

[0046] In this embodiment, the limiter 213 may be a rail lock. The limiter 213 is electrically connected to an external control device, and the external control device can control the limiter 213 to lock on the first rail 220 or control the limiter 213 to separate from the first rail 220. In the process of the two first adjustment components 210 approaching or moving away from each other, if the distance between the two first adjustment components 210 reaches a level that allows the battery to be clamped to be placed, the battery is placed on the two first adjustment components 210, and then the two first adjustment components 210 are controlled to approach each other. After the two first adjustment components 210 abut against the two ends of the battery, the limiter 213 is controlled to lock with the first rail 220 to prevent the first adjustment components 210 from shaking or sliding, causing the battery to be detached.

[0047] In some embodiments, the second limiting device 300 further includes two second adjustment components 310 . The two second adjustment components 310 are respectively disposed at both ends of the limiting member 320 and connected to the limiting member 320 . The second adjustment components 310 can drive the limiting member 320 to move closer to or away from the tray body 100 .

[0048] In this embodiment, both ends of each stopper 320 are connected to a second adjustment assembly 310, and the second adjustment assembly 310 can control the stopper 320 to move closer to or farther from the tray body 100. After the battery is clamped by the first stopper assembly, the stopper 320 is controlled to move along the second direction Y so that the two stoppers 320 can move above the surface of the battery, and then the stopper 320 is controlled to move toward the tray body 100 so that the stopper 320 abuts against the surface of the battery, pressing the battery against the first adjustment assembly 210 to prevent the battery from shaking during processing.

[0049] Figure 4 It is a structural schematic diagram of a second adjustment component 310 of an embodiment of a battery tray of the utility model.

[0050] In some embodiments, the second adjustment assembly 310 includes a support seat 311, a second guide rail 312, and a second slider 313. The support seat 311 is connected to the second slider 313, and the second slider 313 is slidably disposed on the second guide rail 312. The second guide rail 312 is disposed on the surface of the tray body 100 and extends along the second direction Y, so that the support seat 311 can reciprocate along the second direction Y. The two ends of the stopper 320 are respectively connected to the corresponding support seat 311 of the second adjustment assembly 310.

[0051] In this embodiment, by controlling the support seats 311 at both ends of the limiting members 320 to slide along the second guide rail 312, the two limiting members 320 can approach or move away from each other to limit batteries of different widths, so that the battery tray of this embodiment can be compatible with batteries of different widths.

[0052] In some embodiments, the second adjustment component 310 further includes an elastic member 314, a lifting member 315, and a support block 316. The lifting member 315 is slidably disposed on the support seat 311, the support block 316 is detachably disposed on the surface of the tray body 100, one end of the elastic member 314 is connected to the lifting member 315, and the other end is connected to the support block 316, and the stopper 320 is connected to the lifting member 315. Among them, the elastic member 314 can be an elastic member such as a spring.

[0053] The lifting assembly 315 can move closer to or farther away from the tray body 100 along the third direction Z, so that the limit member 320 moves closer to or farther away from the battery. The elastic member 314 is configured to apply an elastic force toward the tray body 100 to the lifting assembly 315, so that the limit member 320 abuts against the surface of the battery. The third direction Z is perpendicular to the surface of the tray body 100.

[0054] In this embodiment, a third guide rail is provided on the surface of the support seat 311 facing the elastic member 314, and the lifting assembly 315 is slidably arranged on the third guide rail through a third slider, so that the lifting assembly 315 can approach or move away from the tray body 100 along the third direction Z to achieve lifting movement. The third guide rail and the third slider are not shown in the figure.

[0055] During the lifting and lowering movement of the lifting assembly 315, the limiting members 320 will move up and down together with the lifting assembly 315. Through the lifting and lowering movement of the lifting assembly 315, the two limiting members 320 can move to the top of the battery and abut against the surface of the battery, so that the battery is limited to the tray body 100.

[0056] When the limiter 320 abuts against the surface of the battery, since the elastic member 314 can apply an elastic force toward the tray body 100 to the lifting assembly 315, the lower surface of the limiter 320 can fit tightly against the surface of the battery to press the battery and prevent the battery from shaking up and down.

[0057] Specifically, the support block 316 is detachably connected to the surface of the tray body 100. When the support block 316 is separated from the surface of the tray body 100, the support seat 311 can slide along the second guide rail 312. After the support seat 311 slides to a suitable position, the support block 316 is connected to the surface of the tray body 100, so that the elastic member 314 can apply a stable elastic force to the lifting assembly 315.

[0058] In some embodiments, the lifting assembly 315 includes a first fixing plate 3151, a second fixing plate 3152, and a driving member 3153. The second fixing plate 3152 is slidably connected to the support seat 311, the first fixing plate 3151 and the second fixing plate 3152 are arranged on surfaces opposite to each other, the driving member 3153 is arranged on the surface of the second fixing plate 3152 facing the first fixing plate 3151, and the telescopic end of the driving member 3153 is telescopically connected to the first fixing plate 3151 along the third direction Z. The driving member 3153 can be a screw motor, a telescopic rod, or other devices capable of telescopic movement.

[0059] In this embodiment, the second fixing plate 3152 is slidably disposed on the third guide rail via the third slider, and the external driving device can control the second fixing plate 3152 to slide along the third guide rail, so that the second fixing plate 3152 can be close to or away from the tray body 100. When the second fixing plate 3152 is fixed to the third guide rail, the telescopic end of the driving member 3153 can drive the first fixing plate 3151 to be close to or away from the second fixing plate 3152 through telescopic movement, so that the limiting member 320 is close to or away from the surface of the tray body 100, and the lifting and lowering control of the limiting member 320 along the third direction Z is realized.

[0060] After the lower surface of the limiting member 320 abuts against the surface of the battery, the telescopic end of the driving member 3153 is fixed and the second fixing plate 3152 is in a state of being movably arranged on the third guide rail. At this time, the elastic member 314 is in an extended state and can exert an elastic force on the second fixing plate 3152, so that the first fixing plate 3151 drives the limiting member 320 to exert pressure on the surface of the battery, so that the lower surface of the limiting member 320 abuts against the surface of the battery.

[0061] In some embodiments, the first fixing plate 3151 is located at an end of the driving member 3153 away from the tray body 100, the second fixing plate 3152 is located at an end of the driving member 3153 close to the tray body 100, one end of the elastic member 314 abuts against the second fixing plate 3152, and the other end abuts against the support block 316, and the limit member 320 is connected to the first fixing plate 3151.

[0062] The driving member 3153 can drive the first fixing plate 3151 to reciprocate along the third direction Z relative to the supporting seat 311 , so that the limiting member 320 abuts against or is spaced apart from the battery.

[0063] In this embodiment, by setting the first fixing plate 3151 at one end of the driving member 3153 away from the tray body 100, the driving member 3153 can drive the first fixing plate 3151 to move up and down, and the elastic member 314 can apply elastic force to the limiting member 320 through the second fixing plate 3152.

[0064] In some embodiments, the lifting assembly 315 further includes a first fixing member 3154, a second fixing member 3155 and a connecting member 3156. The first fixing member 3154 and the second fixing member 3155 are connected to the first fixing plate 3151 and extend toward the limiting member 320, one end of the limiting member 320 is located between the first fixing member 3154 and the second fixing member 3155, and the connecting member 3156 is penetrated through the first fixing member 3154, the limiting member 320 and the second fixing member 3155, so that the limiting member 320 is connected to the first fixing plate 3151.

[0065] In this embodiment, one end of the limit member 320 is limited by the connecting member 3156 between the first fixing member 3154 and the second fixing member 3155, so that the limit member 320 is connected to the first fixing plate 3151, and the first fixing plate 3151 can drive the limit member 320 to move up and down, and the elastic member 314 can apply elastic force to the limit member 320.

[0066] In some embodiments, the surface of the limiting member 320 facing the tray body 100 has an uneven tooth-like structure.

[0067] In this embodiment, since the surface of the battery is not flat, when the limit member 320 abuts against the surface of the battery, the uneven toothed structure on the lower surface of the limit member 320 can increase the contact area between the limit member 320 and the battery, thereby avoiding the situation where the limit member 320 cannot press the battery due to the uneven surface of the battery.

[0068] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery tray, characterized in that: The battery tray comprises: Tray body; At least two first limiting devices, the first limiting devices are arranged on the surface of the tray body, the first limiting devices include a first adjusting component, and at least two of the first adjusting components are slidably arranged at two ends of the first limiting device, so that the two first adjusting components can approach or move away from each other along a first direction; At least two second limiting devices are arranged on the surface of the tray body and are respectively located on both sides of the first limiting device. The second limiting device includes two limiting members, which extend along the first direction and can approach or move away from the first limiting device along the second direction.

2. The battery tray according to claim 1, characterized in that: The first limiting device also includes a first guide rail and a first slider. The first adjusting assembly is connected to the first slider. The first slider is slidably disposed on the first guide rail. The first guide rail extends along the first direction.

3. The battery tray according to claim 2, characterized in that: The first adjustment assembly includes a supporting portion and a clamping portion, wherein the supporting portion is parallel to the surface of the tray body, the clamping portion is perpendicular to the supporting portion, and the clamping portion is located on a side of the supporting portion away from the tray body, and the surface of the supporting portion close to the tray body is connected to the first sliding block; The clamping parts of the first adjustment assembly located at two ends of the first limiting device can respectively abut against two ends of the battery when they are close to each other.

4. The battery tray according to claim 3, characterized in that: The first adjustment assembly further includes a limiter, the limiter is disposed on the support portion and faces the first guide rail, and the limiter is movably connected to the first guide rail; When the stopper is separated from the first guide rail, the first adjustment component can reciprocate along the first guide rail, and when the stopper is connected to the first guide rail, the first adjustment component is confined to the first guide rail.

5. The battery tray according to claim 1, characterized in that: The second limiting device further includes two second adjusting components, which are respectively arranged at two ends of the limiting member and connected to the limiting member, and the second adjusting components can drive the limiting member to approach or move away from the tray body.

6. The battery tray according to claim 5, characterized in that: The second adjustment assembly includes a support seat, a second guide rail and a second slider, the support seat is connected to the second slider, the second slider is slidably arranged on the second guide rail, the second guide rail is arranged on the surface of the tray body and extends along the second direction, so that the support seat can reciprocate along the second direction; Both ends of the limiting member are respectively connected to corresponding supporting seats of the second adjusting assembly.

7. The battery tray according to claim 6, characterized in that: The second adjustment assembly further includes an elastic member, a lifting assembly and a support block, wherein the lifting assembly is slidably disposed on the support seat, the support block is detachably disposed on the surface of the tray body, one end of the elastic member is connected to the lifting assembly, and the other end is connected to the support block, and the limit member is connected to the lifting assembly; The lifting assembly can approach or move away from the tray body along a third direction so that the limit member approaches or moves away from the battery. The elastic member is configured to apply an elastic force toward the tray body to the lifting assembly so that the limit member abuts against the surface of the battery. The third direction is perpendicular to the surface of the tray body.

8. The battery tray according to claim 7, characterized in that: The lifting assembly comprises a first fixing plate, a second fixing plate and a driving member, wherein the second fixing plate is slidably connected to the supporting seat; The first fixing plate is arranged opposite to the surfaces of the second fixing plate, the driving member is arranged on the surface of the second fixing plate facing the first fixing plate, and the telescopic end of the driving member is telescopically connected to the first fixing plate along the third direction.

9. The battery tray according to claim 8, characterized in that: The first fixing plate is located at an end of the driving member away from the tray body, the second fixing plate is located at an end of the driving member close to the tray body, one end of the elastic member abuts against the second fixing plate, and the other end abuts against the support block, and the limiting member is connected to the first fixing plate; The driving member can drive the first fixing plate to reciprocate relative to the supporting seat along the third direction, so that the limiting member abuts against or is spaced apart from the battery.

10. The battery tray according to claim 1, characterized in that: The surface of the limiting member facing the tray body has an uneven tooth-like structure.

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