CN220787218U - Pallet carrier - Google Patents

Abstract

The utility model provides a tray carrier, which comprises a tray and a pressing mechanism, wherein the pressing mechanism comprises a base, a first screw rod and a pressing block assembly, the base is fixedly connected with the tray, the first screw rod is rotationally connected to the base, the pressing mechanism is connected with the first screw rod, and the pressing block assembly can be driven to move by rotating the first screw rod, so that the pressing block assembly presses a workpiece, and when the pressing block assembly moves between different stations of the tray carrier, the pressing block assembly keeps pressing the workpiece under the action of the resistance of the first screw rod, so that the workpiece is prevented from moving, and the precision is improved; the tray carrier is simple in structure and low in cost.

Description

Pallet carrier

Technical Field

The utility model relates to the field of production auxiliary equipment, in particular to a tray carrier.

Background

The battery of an automobile requires machining at a plurality of stations during assembly and turning of the work piece during machining, so that the battery is assembled by placing the battery case on a tray carrier and then moving or turning the tray carrier in a line. In the existing tray carrier, workpieces are fixed through a compressing mechanism driven by an air cylinder or a motor, when the workpieces are conveyed among different stations, a power source of the air cylinder or the motor is required to be disconnected, and the workpieces cannot be continuously compressed after the power source is disconnected by the air cylinder or the motor, so that the workpieces are in a loose state when conveyed among the different stations, and the workpieces are easy to displace.

Disclosure of utility model

In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide a pallet carrier, which can still compress workpieces when the pallet carrier is transported between different stations.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The utility model provides a tray carrier, includes tray and at least one hold-down mechanism, hold-down mechanism includes base, first screw rod and briquetting subassembly, the base is fixed on the tray, first screw rod rotates to be connected on the base, briquetting subassembly with first screw rod links to each other, just first screw rod is relative can drive when the base rotates briquetting subassembly motion is in order to compress tightly the work piece.

In some aspects of the application, the press block assembly comprises a press plate, a connecting rod and a moving block, wherein the moving block is in threaded connection with the first screw, the press plate is rotatably connected to the base, one end of the connecting rod is rotatably connected with the moving block, the other end of the connecting rod is rotatably connected with the press plate, and a distance exists between the connection position between the press plate and the base and the connection position between the press plate and the connecting rod.

In some aspects of the application, the briquette assembly further includes a first connecting shaft connecting the pressing plate and the base, a second connecting shaft connecting the connecting rod and the pressing plate, and a third connecting shaft connecting the connecting rod and the moving block; when the pressing mechanism is in a workpiece pressing state, the planes of the first connecting shaft and the second connecting shaft are parallel to the axis of the first screw, and the planes of the second connecting shaft and the third connecting shaft are perpendicular to the axis of the first screw.

In some aspects of the present disclosure, the pressing plate includes a connection portion and a pressing portion, the first connection shaft and the second connection shaft are both connected to the connection portion, the pressing portion is connected to one end of the connection portion, the pressing portion and the connection portion form a right angle, and the pressing portion is used for pressing the workpiece.

In some aspects of the present disclosure, the base includes a support and a cushion block, the support and the cushion block are both fixedly connected to the tray, and the support and the cushion block are disposed at intervals, the first screw is connected to the support, a pressing portion of the pressing plate faces the cushion block, and when the pressing mechanism is in a locked state, the workpiece is located between the pressing portion and the cushion block.

In some aspects of the present application, the bracket includes a first beam, a second beam, and two upright posts, where the first beam and the second beam are disposed at intervals, the first beam is connected to the tray, one end of each upright post is connected to the first beam, and the other end of each upright post is connected to the second beam, so that a cavity is formed between the first beam and the second beam; the first end of first screw rod with first crossbeam rotates to be connected, the second end of first screw rod runs through the second crossbeam just with the second crossbeam rotates to be connected, first screw rod is in the second crossbeam deviates from one side of first crossbeam is equipped with the linkage segment, the linkage segment is used for with the drive first screw rod rotatory actuating mechanism is connected.

In some aspects of the present disclosure, the tray carrier further includes a support member connected to the tray for supporting the workpiece, the support member includes a second screw, a bearing, and a support pad, the second screw is in threaded connection with the tray, the bearing is fixed at one end of the second screw, the support pad is fixed on the bearing, and the support pad is rotatable relative to the second screw.

In some aspects of the application, the second screw is provided with a non-circular bore at an end remote from the support pad, the non-circular bore being for connection with a tool for rotating the second screw.

In some aspects of the application, the support further comprises a first limiting collar and a second limiting collar, both of which are fixed on the second screw, the first limiting collar being disposed between the tray and the bearing, the second limiting collar being disposed on a side of the tray facing away from the bearing; the first limiting convex ring and the second screw rod are of an integrated structure, and the second limiting convex ring is in threaded connection with the circumferential outer surface of the second screw rod.

In some aspects of the present application, the plurality of pressing mechanisms are disposed at intervals and distributed on the edge of the tray, and the plurality of supporting members are disposed at intervals and distributed on the middle of the tray.

The beneficial effects are that: the tray carrier comprises a tray and a pressing mechanism, wherein the pressing mechanism comprises a base, a first screw rod and a pressing block assembly, the base is fixedly connected with the tray, the first screw rod is rotationally connected to the base, the pressing mechanism is connected with the first screw rod, the pressing block assembly can be driven to move by rotating the first screw rod, so that the pressing block assembly presses a workpiece, and when the tray carrier moves between different stations, the pressing block assembly keeps pressing the workpiece under the action of the resistance of the first screw rod, so that the workpiece is prevented from moving, and the precision is improved; the tray carrier is simple in structure and low in cost.

Drawings

Fig. 1 is a schematic structural view of a tray carrier.

Fig. 2 is a schematic perspective view of the pressing mechanism.

Fig. 3 is a schematic perspective view of a pressing mechanism.

Fig. 4 is a schematic front view of the hold-down mechanism.

Fig. 5 is a schematic cross-sectional view of fig. 4.

Fig. 6 is a schematic perspective view of the support member.

Fig. 7 is a schematic perspective view of a second supporting member.

Fig. 8 is a schematic cross-sectional view of a support.

Description of main reference numerals: 1-a tray; 2-a support; 21-a second screw; 211-a non-circular inner bore; 22-bearings; 23-a support pad; 24-a first limiting convex ring; 25-a second limiting convex ring; 3-a compressing mechanism; 31-a base; 311-brackets; 3111-a first beam; 3112-a second beam; 3113-posts; 312-cushion blocks; 32-a first screw; 321-connecting segments; 33-briquetting assembly; 331-a platen; 3311—a connection; 3312—a pressing portion; 332-connecting rod; 333-moving block; 334-a first connecting shaft; 335-a second connecting shaft; 336-third connecting shaft.

Detailed Description

The present utility model provides a tray carrier, and for making the purpose, technical solution and effect of the present utility model clearer and more definite, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the automatic production of automobile batteries, the batteries need to be operated at different stations, and the postures of the batteries need to be changed, for example, in the production process of the batteries, the bottom plate of the battery shell needs to be fixed on a tray carrier, then the side plates of the plurality of battery shells and the bottom plate of the battery shell are welded, screw holes are drilled in the battery shells, then the electrode plates are installed inside the battery shells, and the like, and each process needs to be completed at different stations, so that after the bottom plate of the battery shell and the tray are positioned and fixed, the bottom plate of the battery shell and the tray are moved to the corresponding stations through the tray, and repeated positioning of workpieces is not needed. If the tray moves and cannot compress the workpiece, the workpiece and the tray can relatively move in the moving process, and the position of the workpiece is inaccurate. The application provides a tray carrier, which can keep the compression of workpieces in the moving process and avoid the relative movement between the workpieces and a tray.

In the present application, the automobile battery is described as an example, and the tray carrier of the present application is not limited to be applied only to the production of the automobile battery.

Referring to fig. 1-5, a tray carrier includes a tray 1, a support 2, and a hold-down mechanism 3. The pallet 1 is intended to be connected to a production line, for example: when it is necessary to transfer a workpiece (e.g., an automobile battery), the workpiece is fixed to the pallet 1, and then the transfer device pulls the pallet 1 to move so that the workpiece moves on the production line. Also for example: when it is necessary to process a workpiece, the pallet 1 is fixed to a processing apparatus, and the workpiece is fixed to the pallet 1, and then the workpiece is processed. The support 2 and the pressing mechanism 3 are both connected to the tray 1, the support 2 is used for supporting a workpiece, and the pressing mechanism 3 is used for fixing the workpiece to the tray 1.

The pressing mechanism 3 comprises a base 31, a first screw rod 32 and a pressing block assembly 33, wherein the base 31 is fixedly connected with the tray 1, and the first screw rod 32 is rotatably connected to the base 31 and used for driving the pressing block assembly 33 to move; the press block assembly 33 is connected to the first screw 32, and the first screw 32 can drive the press block assembly 33 to move when rotating relative to the base 31 so as to press the workpiece on the tray 1.

In one embodiment, the pressing block assembly 33 includes a pressing plate 331, a connecting rod 332 and a moving block 333, the moving block 333 is in threaded connection with the first screw 32, the pressing plate 331 is rotatably connected to the base 31, one end of the connecting rod 332 is rotatably connected to the moving block 333, the other end is rotatably connected to the pressing plate 331, and a connection position between the pressing plate 331 and the base 31 and a connection position between the pressing plate 331 and the connecting rod 332 have a distance. Wherein, when the first screw 32 rotates, the moving block 333 moves along the axial direction of the first screw 32, and the connecting rod 332 pulls the pressing plate 331 to swing around the connection point (i.e., the first connection shaft 334) with the base 31, so that the pressing plate 331 can press or release the workpiece.

The press block assembly 33 further includes a first connecting shaft 334, a second connecting shaft 335 and a third connecting shaft 336, where the first connecting shaft 334 connects the press plate 331 and the base 31, and at least one of the first connecting shaft 334 and the press plate 331 and the first connecting shaft 334 and the base 31 is rotationally connected, for example: the first connecting shaft 334 is in rotational connection with the pressing plate 331, the first connecting shaft 334 is in fixed connection with the base 31, or the first connecting shaft 334 is in fixed connection with the pressing plate 331, the first connecting shaft 334 is in rotational connection with the base 31, or the first connecting shaft 334 is in rotational connection with the pressing plate 331 and the first connecting shaft 334 is in rotational connection with the base 31, so that the pressing plate 331 can rotate relative to the base 31.

Similarly, the second connecting shaft 335 connects the connecting rod 332 and the pressing plate 331, and at least one of the second connecting shaft 335 and the pressing plate 331 and the second connecting shaft 335 and the connecting rod 332 is rotatably connected, so that the connecting rod 332 can rotate relative to the pressing plate 331. The third connecting shaft 336 connects the link 332 and the moving block 333; and at least one of the third connecting shaft 336 and the connecting rod 332 and the third connecting shaft 336 and the moving block 333 is rotatably connected, so that the connecting rod 332 can rotate relative to the moving block 333.

In the above, the axes of the first, second and third connection shafts 334, 335 and 336 are parallel and perpendicular to the axis of the first screw 32, so that the pressing plate 331, the link 332 and the moving block 333 can be moved by the first screw 32.

In the embodiment shown in fig. 5, the first connecting shaft 334 is rotatably connected with the pressing plate 331 and the first connecting shaft 334 is rotatably connected with the base 31, and the two ends of the first connecting shaft 334 are prevented from being separated from the pressing plate 331 and the base 31 by the aid of the C-shaped clamping rings, so that the first connecting shaft 334 is convenient to install. Similarly, the second connecting shaft 335 is rotatably connected with the pressing plate 331 and the second connecting shaft 335 is rotatably connected with the connecting rod 332, and the two ends of the second connecting shaft 335 are prevented from being separated from the pressing plate 331 and the connecting rod 332 by the aid of the C-shaped clamping rings, so that the second connecting shaft 335 is convenient to install. The third connecting shaft 336 is rotatably connected with the connecting rod 332 and the third connecting shaft 336 is rotatably connected with the moving block 333, and the two ends of the third connecting shaft 336 are prevented from being separated from the moving block 333 and the connecting rod 332 by the aid of the C-shaped clamping rings, so that the third connecting shaft 336 is convenient to install.

When the pressing mechanism 3 is in a workpiece pressing state, the planes of the first connecting shaft 334 and the second connecting shaft 335 are parallel to the axis of the first screw rod 32, the planes of the second connecting shaft 335 and the third connecting shaft 336 are perpendicular to the axis of the first screw rod 32, that is, the connecting rod 332 is in a horizontal state (perpendicular to the axis of the first screw rod 32), at this time, the reaction force applied to the pressing plate 331 by the workpiece only has one horizontal force at the connecting rod 332, so that the moving block 333 cannot move along the axis of the first screw rod 32, self-locking of the pressing mechanism 3 is realized, and a better pressing effect on the workpiece is realized. Wherein, the pressing mechanism 3 is in a state of pressing the workpiece and is also just in a position of a self-locking dead point of the pressing block assembly 33.

In other embodiments, when the pressing mechanism 3 is in a state of pressing the workpiece, after the reaction force of the workpiece is transmitted through the pressing block assembly 33, the force of the moving block 333 in the axial direction relative to the first screw 32 is smaller than the friction force between the moving block 333 and the first screw 32, so that the moving block 333 cannot move along the first screw 32, and the workpiece is pressed.

The pressing plate 331 includes a connection portion 3311 and a pressing portion 3312, and the first connection shaft 334 and the second connection shaft 335 are connected to the connection portion 3311, and since a plane in which the first connection shaft 334 and the second connection shaft 335 are located is parallel to an axis of the first screw 32, a length direction of the connection portion 3311 is parallel to the axis of the first screw 32. The pressing part 3312 is connected to one end of the connecting part 3311, and the pressing part 3312 and the connecting part 3311 form a right angle, the pressing part 3312 is a free end of the pressing plate 331, and the pressing part 3312 is used for pressing the workpiece. Because the pressing portion 3312 and the connecting portion 3311 form a right angle, the direction of the reaction force applied by the workpiece on the pressing plate 331 is the length direction of the connecting portion 3311, so that the force applied by the pressing plate 331 to the connecting rod 332 is only the horizontal force, and the self-locking capability of the pressing mechanism 3 is improved.

The base 31 includes support 311 and cushion 312, and support 311 and cushion 312 all are with tray 1 fixed connection, and support 311 and cushion 312 interval set up, and first screw rod 32 is connected on support 311, and the clamp splice 3312 of clamp plate 331 is towards cushion 312, and when hold-down mechanism 3 is in the hasp state, the work piece is located between clamp splice 3312 and the cushion 312. The cushion block 312 is arranged, so that the cushion block 312 can play a supporting role on a workpiece, and deformation of the workpiece in the pressing process is avoided.

The bracket 311 includes a first beam 3111, a second beam 3112 and two columns 3113, the first beam 3111 and the second beam 3112 are disposed at intervals, the first beam 3111 is connected to the tray 1, one end of the column 3113 is connected to the first beam 3111, and the other end is connected to the second beam 3112, so that the first beam 3111, the second beam 3112 and the two columns 3113 enclose a "mouth" shape, i.e. a cavity is formed between the first beam 3111 and the second beam 3112. The first end of the first screw 32 is rotatably connected with the first beam 3111, and the second end of the first screw 32 penetrates through the second beam 3112 and is rotatably connected with the second beam 3112, so that both ends of the first screw 32 are connected with the bracket 311, and stability of the first screw 32 is improved.

The first screw 32 is provided with a connecting section 321 on the side of the second cross beam 3112 facing away from the first cross beam 3111, the connecting section 321 being intended for connection with a drive mechanism for driving the first screw 32 in rotation, for example: the first screw 32 is manually rotated by a worker through a wrench, or the first screw 32 is automatically rotated by a robot through a wrench, or a driving mechanism such as a motor or a rotary cylinder is mounted on the bracket 311, and the driving mechanism is connected with the connecting section 321, so that the driving mechanism can drive the first screw 32 to rotate.

In the above description, the first beam 3111, the second beam 3112 and the two columns 3113 may be integrally cast, or may be fixed together by welding. Wherein, be equipped with the screw hole on the first crossbeam 3111, the screw passes the screw hole and is connected with tray 1, realizes fixing support 311 on tray 1.

In the embodiment shown in fig. 2, the first beam 3111 has a "u" shape in a top view, and screw holes for connecting with the tray 1 are provided at both ends of the first beam 3111, so that a contact area of the first beam 3111 with the tray is increased, and a stress strength of the first beam 3111 is improved. The spacer 312 is located at the opening position of the first cross beam 3111, so that the area occupied by the hold-down mechanism 3 is reduced.

In other embodiments, the pressing block assembly 33 is a pressing plate 331, the pressing plate 331 is in threaded connection with the first screw rod 32, so that the pressing plate 331 can be driven by the first screw rod 32 to move, further, compaction and loosening of the comparison workpiece are achieved, and two sides of the pressing plate 331 are respectively in sliding connection with the two vertical columns 3113, so that the vertical columns 3113 can limit the swinging of the pressing plate 331.

Referring to fig. 6-8, in an embodiment, the support 2 includes a second screw 21, a bearing 22 and a support pad 23, a threaded hole for connecting with the second screw 21 is formed in the tray, the second screw 21 is in threaded connection with the tray 1, the bearing 22 is fixed at one end of the second screw 21, the support pad 23 is fixed on the bearing 22, and the support pad 23 can rotate relative to the second screw 21. The second screw 21 is in threaded connection with the tray 1, so that the height of the position of the supporting piece 2 for supporting the workpiece can be adjusted when the second screw 21 is rotated, and the workpiece can be adapted to workpieces of different types. And through bearing 22 between second screw rod 21 and the supporting pad 23 for when rotating second screw rod 21, supporting pad 23 can not rotate relative work piece surface, avoids the surface of work piece to be scratched, also makes the rotation of second screw rod 21 easier.

The second screw 21 is rotated to adjust the height of the workpiece, so that the pressing mechanism 3 is just positioned at the self-locking dead point of the pressing block assembly 33 when the pressing mechanism is in a state of pressing the workpiece, and the fixing reliability of the pressing mechanism 3 to the workpiece is improved.

The second screw 21 is provided with a non-circular inner bore 211 at the end remote from the support pad 23, the non-circular inner bore 211 being intended for connection with a tool for rotating the second screw 21. Wherein the tool is adapted to the non-circular bore 211 such that the second screw 21 can be turned by using the tool. For example: the tool for rotating the second screw 21 is a wrench, the cross section of one end of the wrench is polygonal, the non-circular inner hole 211 is a hole with the polygonal cross section, and when the second screw 21 needs to be rotated, the wrench (the end with the polygonal cross section) is inserted into the non-circular inner hole 211, and then the wrench is operated to adjust the height of the second screw 21.

The supporting piece 2 further comprises a first limiting convex ring 24 and a second limiting convex ring 25, the first limiting convex ring 24 and the second limiting convex ring 25 are fixed on the second screw rod 21 and located on two sides of the tray 1, and the first limiting convex ring 24 and the second limiting convex ring 25 are used for preventing the second screw rod 21 from falling off from the tray 1. In detail, the first limiting collar 24 is disposed between the tray 1 and the bearing 22, and the second screw 21 is at the lowest position when the second screw 21 rotates until the first limiting collar 24 contacts the tray 1. The second limiting convex ring 25 is arranged on one side of the tray 1, which is away from the bearing 22, and when the second screw 21 rotates until the second limiting convex ring 25 contacts with the tray 1, the second screw 21 is at the highest position.

The first limiting convex ring 24 and the second screw 21 are of an integral structure, so that the manufacturing is convenient. The second limiting convex ring 25 is in threaded connection with the circumferential outer surface of the second screw rod 21, and after the second screw rod 21 passes through a screw hole in the tray 1, the second limiting convex ring 25 is screwed on the second screw rod 21, so that the connection between the second limiting convex ring 25 and the second screw rod 21 is realized.

The plurality of pressing mechanisms 3 are arranged at intervals, and the plurality of pressing mechanisms 3 are distributed on the edge of the tray 1, so that workpieces can be fixed at a plurality of positions, and the safety is improved. In other embodiments, the pressing mechanism 3 may be configured as one, for example, the workpiece volume is small, it is possible to provide a sufficient pressing force by one pressing mechanism 3; also for example: the tray 1 is provided with a limiting block and a pressing mechanism 3, and after the workpiece is limited by the limiting block, the workpiece can be fixed by pressing through the pressing mechanism 3.

The supporting pieces 2 are configured with a plurality of supporting pieces, the supporting pieces 2 are arranged at intervals and distributed in the middle of the tray 1, so that a plurality of supporting points are arranged on the workpiece, the workpiece is prevented from being deformed, and the quality of the workpiece is improved.

In the present application, "a plurality of" means two or more (including the present number).

It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.

Claims (10)

1. A tray carrier, comprising

A tray;

The pressing mechanism comprises a base, a first screw rod and a pressing block assembly, wherein the base is fixed on the tray, the first screw rod is rotationally connected to the base, the pressing block assembly is connected with the first screw rod, and the pressing block assembly can be driven to move to press a workpiece when the first screw rod rotates relative to the base.

2. The tray carrier of claim 1, wherein the press block assembly comprises a press plate, a connecting rod and a moving block, the moving block is in threaded connection with the first screw, the press plate is rotatably connected to the base, one end of the connecting rod is rotatably connected to the moving block, the other end of the connecting rod is rotatably connected to the press plate, and a connection position between the press plate and the base and a connection position between the press plate and the connecting rod have a distance.

3. The tray carrier of claim 2, wherein,

The pressing block assembly further comprises a first connecting shaft, a second connecting shaft and a third connecting shaft, the first connecting shaft is connected with the pressing plate and the base, the second connecting shaft is connected with the connecting rod and the pressing plate, and the third connecting shaft is connected with the connecting rod and the moving block;

when the pressing mechanism is in a workpiece pressing state, the planes of the first connecting shaft and the second connecting shaft are parallel to the axis of the first screw, and the planes of the second connecting shaft and the third connecting shaft are perpendicular to the axis of the first screw.

4. The tray carrier of claim 3, wherein the tray carrier comprises a plurality of tray holders,

The clamp plate includes connecting portion and compresses tightly the portion, first connecting axle with the second connecting axle all connects on the connecting portion, it connects to compress tightly the portion the one end of connecting portion, just compress tightly the portion with the connecting portion are right angle contained angle, compress tightly the portion and be used for compressing tightly the work piece.

5. The tray carrier of claim 4, wherein the tray carrier comprises a plurality of tray holders,

The base comprises a support and a cushion block, the support and the cushion block are fixedly connected with the tray, the support and the cushion block are arranged at intervals, the first screw rod is connected to the support, the pressing part of the pressing plate faces to the cushion block, and when the pressing mechanism is in a locking state, the workpiece is located between the pressing part and the cushion block.

6. The tray carrier of claim 5, wherein the tray carrier comprises a plurality of tray carriers,

The bracket comprises a first cross beam, a second cross beam and two upright posts, wherein the first cross beam and the second cross beam are arranged at intervals, the first cross beam is connected with the tray, one end of each upright post is connected with the first cross beam, and the other end of each upright post is connected with the second cross beam, so that a cavity is formed between the first cross beam and the second cross beam;

The first end of first screw rod with first crossbeam rotates to be connected, the second end of first screw rod runs through the second crossbeam just with the second crossbeam rotates to be connected, first screw rod is in the second crossbeam deviates from one side of first crossbeam is equipped with the linkage segment, the linkage segment is used for with the drive first screw rod rotatory actuating mechanism is connected.

7. The tray carrier of any one of claims 1-6, further comprising:

The support piece is connected to the tray and used for supporting a workpiece, the support piece comprises a second screw rod, a bearing and a support pad, the second screw rod is in threaded connection with the tray, the bearing is fixed at one end of the second screw rod, the support pad is fixed to the bearing, and the support pad can rotate relative to the second screw rod.

8. The tray carrier of claim 7, wherein the second screw is provided with a non-circular bore at an end remote from the support pad, the non-circular bore for connection with a tool for rotating the second screw.

9. The tray carrier of claim 7, wherein the support further comprises a first spacing collar and a second spacing collar, the first spacing collar and the second spacing collar are both fixed on the second screw, and the first spacing collar is disposed between the tray and the bearing, and the second spacing collar is disposed on a side of the tray facing away from the bearing;

The first limiting convex ring and the second screw rod are of an integrated structure, and the second limiting convex ring is in threaded connection with the circumferential outer surface of the second screw rod.

10. The tray carrier of claim 7, wherein the plurality of pressing mechanisms are arranged at intervals and distributed on the edge of the tray, and the plurality of supporting members are arranged at intervals and distributed on the middle of the tray.