CN117401404A

CN117401404A - Automatic positioning device for material tray

Info

Publication number: CN117401404A
Application number: CN202210847180.1A
Authority: CN
Inventors: 岑紫来; 翟亚斌; 赵成刚
Original assignee: Shenzhen Futaihong Precision Industry Co Ltd
Current assignee: Shenzhen Futaihong Precision Industry Co Ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2024-01-16

Abstract

The application discloses charging tray automatic positioning device, including a positioner, a positioner includes: the bearing assembly is used for bearing a material tray, the material tray is used for bearing materials, and the material tray is provided with a positioning identification area; the detection piece is fixed on the bearing assembly and is used for detecting the positioning identification area when the tray is borne at the preset position of the bearing assembly, and the positioning identification area is positioned at different positions on the bearing assembly when the tray is inverted or not; and the rotating assembly is fixedly connected with the bearing assembly and is used for driving the bearing assembly to rotate by a preset angle when the detection piece does not detect the positioning mark region. According to the automatic positioning device for the material tray, whether the bearing assembly is rotated is determined according to whether the positioning identification area is detected or not, so that the material tray on the bearing assembly is arranged according to the preset direction, the inversion of the material tray is prevented, the arrangement direction of the preset position on the material in the material tray when the preset position is mechanically sucked is matched with the required direction during processing, and the material transfer and processing efficiency is improved.

Description

Automatic positioning device for material tray

Technical Field

The application relates to the technical field of positioning materials, in particular to an automatic positioning device for a material tray.

Background

In the manufacturing process of the product, the material is often required to be transferred and processed, when the material is transferred, the material tray is manually placed at a preset position, the material in the material tray is taken away by the manipulator for other mechanisms to process, in the process, one material tray is manually placed each time, and the material tray can be inverted in the placing process, so that the material placement direction in the material tray is inconsistent with the direction required by the manipulator for processing after being sucked, and the material placement direction is consistent with the placement direction of the material during processing after the manipulator rotates, so that the manipulator needs to repeatedly rotate, and the material transfer and processing efficiency is definitely influenced.

Disclosure of Invention

The application provides a charging tray automatic positioning device to avoid the material that the charging tray was invertd and is led to shifts and the low problem of machining efficiency.

An automatic positioning device for a tray comprises a first positioning device and a second positioning device;

the first positioning device includes:

the bearing assembly is used for bearing a material tray, the material tray is used for bearing materials, and the material tray is provided with a positioning identification area; the bearing assembly comprises an inlet, and the second positioning device is arranged on one side of the inlet of the bearing assembly;

the detection piece is fixed on the bearing component and is used for detecting the positioning identification area when the tray is borne at a preset position of the bearing component, and the positioning identification area is positioned at different positions on the bearing component when the tray is inverted or not;

the rotating assembly is fixedly connected with the bearing assembly and is used for driving the bearing assembly to rotate by a preset angle when the detecting piece does not detect the positioning mark region;

the second positioning device includes:

the conveying assembly is used for bearing the tray and conveying the tray from the inlet to the bearing assembly.

Further, the first positioning device further comprises a positioning sensing piece, the bearing assembly comprises a substrate, the substrate comprises a first end and a second end which are opposite, the first end is provided with the inlet, the positioning sensing piece is fixed at the second end of the substrate, and the positioning sensing piece is used for detecting whether the tray is placed at the preset position or not.

Further, a baffle plate facing the inlet is fixed at the second end of the base plate, and the preset position is that the tray abuts against the baffle plate.

Further, the bearing assembly further comprises a clamping assembly, the clamping assembly is located at a first end on the base plate, the clamping assembly comprises a first driving piece fixed on the base plate and a moving piece connected with the first driving piece, the first driving piece is used for driving the moving piece to move away from a second end so as to conveniently place the tray at a preset position, and driving the moving piece to move towards the second end so as to clamp the tray when the tray is placed at the preset position.

Further, the rotating assembly comprises a fixed plate, a second driving piece, a rotating piece and a connecting piece, wherein the second driving piece is fixed on the fixed plate, the rotating piece is connected with the second driving piece and rotationally connected to the fixed plate, and the connecting piece is fixedly connected with the bearing assembly.

Further, the rotating assembly further comprises a plurality of positioning sensing pieces fixed on the fixed plate, the bearing assembly comprises a positioning piece, a plurality of positioning sensing pieces are circumferentially distributed around the rotating piece, two of the positioning sensing pieces are located on a circumferential diameter line, and the positioning sensing pieces are used for sensing the positioning pieces.

Further, the automatic positioning device of the material tray comprises two first positioning devices which are arranged side by side, the first positioning devices further comprise a moving assembly, the moving assembly is connected with the rotating assembly and used for driving the rotating assembly to move back and forth, and the moving direction of the moving assembly is parallel to the plane where the rotating direction of the bearing assembly is located.

Further, the second positioning device further comprises a positioning frame, a clamping disc piece and a lifting assembly, the clamping disc piece is slidingly connected to the positioning frame and located above the transmission assembly, the clamping disc piece is used for bearing the charging disc, the lifting assembly is connected with the positioning frame and used for moving upwards to support the charging disc to enable the clamping disc piece to slide away from the charging disc along the positioning frame, and moving downwards to enable the charging disc to descend by a distance equal to the height of the charging disc to enable the clamping disc piece to reversely slide and clamp between two adjacent charging discs to bear the charging disc again, and the lifting assembly is further used for continuing moving downwards when the clamping disc piece is clamped between the two adjacent charging discs to bear the charging disc on the transmission assembly.

Further, the chuck member includes a sliding plate and a hook portion connected to the sliding plate and extending toward the receiving area of the positioning frame, the sliding plate is slidingly connected to the positioning frame, and the hook portion is used for carrying the tray.

Further, the automatic tray positioning device further comprises a lifting mechanism and a plurality of second positioning devices arranged on the layers, the lifting mechanism is connected with the first positioning devices and used for lifting the first positioning devices to align with one of the second positioning devices, the bearing assembly further comprises a conveying assembly, the conveying assembly is used for conveying the tray on the second positioning devices to the first positioning devices when the first positioning devices align with one of the second positioning devices, the lifting assembly is further used for driving the tray from the first positioning devices to move towards the chuck piece, and when the tray on the conveying assembly moves upwards to the position of the chuck piece, the chuck piece moves towards the tray to bear the tray.

According to the automatic positioning device for the material tray, whether the bearing assembly is rotated is determined according to whether the positioning identification area is detected or not, so that the material tray on the bearing assembly is arranged according to the preset direction, the inversion of the material tray is prevented, the arrangement direction of the preset position on the material in the material tray when the preset position is mechanically sucked is matched with the required direction during processing, and the material transfer and processing efficiency is improved.

Drawings

Fig. 1 is a perspective view of an automatic tray positioning device provided by the application.

Fig. 2 is a perspective view of the tray automatic positioning device in fig. 1 with the fixing frame removed.

Is a schematic diagram of the decomposition of (a).

Fig. 3 is a perspective view of a first positioning device and a lifting mechanism in fig. 2.

Fig. 4 is a perspective view of the first positioning device of fig. 3.

Fig. 5 is a plan view of the first positioning device of fig. 4.

Fig. 6 is an exploded view of the first positioning device of fig. 4.

Fig. 7 is a perspective view of the carrier assembly of fig. 6 in another orientation.

Fig. 8 is a perspective view of the second positioning device of fig. 2.

Fig. 9 is a perspective view of the second positioning device of fig. 8 in another direction.

Fig. 10 is a partially exploded view of the second positioning device of fig. 8.

Description of the main reference signs

Automatic positioning device 100 for material tray

Fixing frame 1

First positioning device 2

Bearing assembly 21

Substrate 211

Limiting plate 212

Inlet 213

Baffle 214

Clamping assembly 215

First driving member 216

Moving member 217

Positioning piece 218

Laser emitter 2181

Laser receiver 2182

Transfer assembly 219

Detecting piece 22

Rotating assembly 23

Fixing plate 231

Second driving member 232

Rotating member 233

Connector 234

Positioning sensing member 235

Positioning sensing piece 24

Moving assembly 25

Connecting plate 251

Connecting block 252

Third driver 253

Tray 3

Accommodation groove 31

Location identifier area 32

Second positioning device 4

Positioning frame 41

Bottom plate 411

Longitudinal plate 412

Transverse plate 413

Retaining member 414

Through hole 415

Accommodation area 410

Clamping plate member 42

Sliding plate 421

Hook 422

Lifting assembly 43

Bearing plate 45

Transport assembly 44

Motor 441

Conveyor belt 442

Conveying member 443

Lifting mechanism 5

Screw 51

Motor 52

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

The terms "first" and "second" and the like in the description of the present application and in the above-described figures are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the term "include" and any variations thereof is intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1 to 7, the present application provides an automatic tray positioning device 100, where the automatic tray positioning device 100 includes a fixing frame 1 and a first positioning device 2 connected to the fixing frame 1. The first positioning device 2 comprises a bearing assembly 21, a detecting piece 22 and a rotating assembly 23. The bearing component 21 is used for bearing the tray 3, the tray 3 is provided with a plurality of accommodating grooves 31, the accommodating grooves 31 are used for bearing materials, the tray 3 is provided with positioning identification areas 32, and the positioning identification areas 32 are positioned on the bearing component 21 at different positions when the tray 3 is inverted or not. The detecting member 22 is fixed on the carrying assembly 21, and is used for detecting the positioning identification area when the tray 3 is carried on a predetermined area of the carrying assembly 21. The rotating assembly 23 is fixedly connected with the bearing assembly 21, and is used for driving the bearing assembly 21 to rotate by a preset angle when the detecting piece 22 does not detect the positioning mark, and the preset angle is 180 degrees.

The automatic tray positioning device 100 determines whether to rotate the bearing component 21 according to whether the positioning identification area 32 is detected, so that the tray 3 on the bearing component 21 is arranged according to a preset direction, the tray 3 is prevented from being inverted, the arrangement direction of preset parts (such as charging connecting holes) on materials (such as mobile phone shells) in the tray 3 when being mechanically sucked is matched with the required direction during processing, and the material transfer and processing efficiency is improved.

Specifically, the positioning mark area 32 may be a corner defect of one corner of the tray 3, and the detecting element 22 is a photodetector. The tray 3 is placed under the tray 3 when placed on the carrying component 21, when the tray 3 is placed correctly, the photoelectric detector is opposite to the unfilled corner, and when the tray 3 is inverted, the corner at the other end of the tray 3 is opposite to the tray 3 due to the fact that the corner is not missing, so that when the tray 3 is placed correctly and not placed correctly, the photoelectric detector can feed back different signals, and accordingly whether the tray 3 is placed correctly is determined.

The carrying assembly 21 includes a base plate 211 and limiting plates 212 fixed on opposite sides of the base plate 211, and the tray 3 is disposed between the two limiting plates 212. The substrate 211 includes a first end and a second end opposite to each other, the first end has an inlet 213 for material to enter, and the carrier assembly 21 further includes a baffle 214 fixed to the second end of the substrate 211 and facing the inlet 213. The first positioning device 2 further includes a positioning sensing member 24, where the positioning sensing member 24 is fixed at the second end of the substrate 211, and the positioning sensing member 24 is configured to detect whether the tray 3 is placed at the predetermined position, and when the tray 3 is placed at the predetermined position, the tray 3 abuts against the baffle 214. The positioning sensing member 24 may be a photoelectric sensor that determines whether the tray 3 is moved to a predetermined position by sensing whether it is covered by the tray 3.

The carrying assembly 21 further includes a clamping assembly 215, where the clamping assembly 215 is located at a first end of the substrate 211, and includes a first driving member 216 fixed on the substrate 211 and a moving member 217 connected to the first driving member 216, where the first driving member 216 is used to drive the moving member 217 to move away from the second end so as to facilitate placement of the tray 3 at a preset position, and drive the moving member 217 to move toward the second end so as to clamp the tray 3 when the tray 3 is placed at the preset position. The first driving member 216 may be a linear cylinder, and the moving member 217 is coupled to one end of the linear cylinder.

The rotating assembly 23 includes a fixed plate 231, a second driving member 232, a rotating member 233, and a connecting member 234. The second driving member 232 is fixed to the bottom surface of the fixed plate 231, and the rotating member 233 is connected to the second driving member 232 and rotatably connected to the fixed plate 231, and the connecting member 234 is fixedly connected to the base plate 211 and fixedly connected to the rotating member 233 through the base plate 211. The second driving member 232 drives the rotating member 233 to rotate, so as to drive the connecting member 234 and the substrate 211 to rotate, and further drive the tray 3 disposed above the substrate 211 to rotate. The second driving member 232 may be a stepping motor. The rotating member 233 includes two rotating wheels and a belt sleeved on the two rotating wheels. The rotating assembly 23 further includes a plurality of positioning sensing members 235 fixed on the fixing plate 231, positioning members 218 extending from the bottom surface of the base plate 211, the plurality of positioning sensing members 235 being circumferentially distributed around the rotating member 233, two positioning sensing members 235 among the plurality of positioning sensing members 235 being located on a circumferential diameter line, the plurality of positioning sensing members 235 being configured to sense the positioning members 218, and the bearing assembly 21 being determined to be rotated 180 degrees when the positioning sensing members 235 at a predetermined position sense the positioning members 218. The positioning sensing member 235 includes a laser emitter 2181 and a laser receiver 2182 that are disposed at intervals, when the carrier 21 is placed at a predetermined position, the positioning member 218 is disposed between the laser emitter 2181 and the laser receiver 2182 of one positioning sensing member 235, and when another positioning sensor on the diameter line of the positioning sensing member 235, which initially senses the positioning member 218, senses that the positioning member 218 is disposed between the laser emitter 2181 and the laser receiver 2182 thereof, it is determined that the carrier 21 is rotated 180 degrees. At this time, the second driving member 232 stops driving the rotating member 233, thereby completing the rotation of the carrier assembly 21.

The automatic tray positioning device 100 comprises two first positioning devices 2 arranged side by side. Through the bearing component 21 on the other first positioning device 2 for bearing the material trays 3, when all materials on one material tray 3 are sucked by the manipulator to be removed for processing or testing and the material trays 3 are placed, the materials on the other material tray 3 can be sucked and removed for processing or testing immediately, and at the moment, the material trays 3 corresponding to the processed or tested materials can be replaced, so that the whole process of the manipulator has no waiting tray replacing time, and the efficiency is improved. The first positioning device 2 further comprises a moving component 25, wherein the moving component 25 is connected with the rotating component 23 and is used for driving the rotating component 23 to move back and forth in a direction perpendicular to the inlet 213, and the moving direction of the moving component 25 is parallel to a plane where the rotating direction of the bearing component 21 is located. In this way, a collision of one positioning device 2 with another positioning device during rotation can be avoided.

The moving assembly 25 includes a connection plate 251, a connection block 252, and a third driving member 253. The connecting block 252 is fixedly connected with the fixing plate 231 and slidingly connected to the connecting plate 251, and the third driving member 253 is connected with the connecting block 252 and is used for driving the connecting block 252 to slide on the connecting plate 251, so that the connecting block 252 drives the fixing plate 231 to move, and further the movement of the rotating assembly 23 and the bearing assembly 21 is realized. Specifically, the connecting plate 251 and the connecting block 252 are slidably connected in a sliding rail and sliding groove matching manner, and the third driving member 253 is a linear cylinder.

Referring to fig. 1-3 and 8-10, the positioning device for the tray 3 further includes a second positioning device 4, where the second positioning device 4 is disposed on a side of the inlet 213 of the carrier 21. The second positioning device 4 comprises a positioning frame 41, a chuck member 42, a lifting assembly 43 and a transmission assembly 44. The chuck member 42 is slidably connected to the positioning frame 41 and located above the transmission member 44, the chuck member 42 is used for carrying the tray 3, the lifting member 43 is connected to the positioning frame 41, and is used for moving upwards to support the tray 3, so that the chuck member 42 slides along the positioning frame 41 to separate from the tray 3, and moving downwards to enable the tray 3 to descend by a distance equal to the height of the tray 3, so that the chuck member 42 slides and is clamped between two adjacent trays 3 reversely to carry the tray 3 again, and the lifting member 43 is further used for continuing to move downwards when the chuck member 42 is clamped between two adjacent trays 3, so that the tray 3 is carried on the transmission member 44. The transfer assembly 44 is used to carry the tray 3 and transfer the tray 3 from the inlet 213 onto the carried assembly 21.

The positioning frame 41 includes a bottom plate 411, two opposite vertical plates 412 connected to the bottom plate 411, and two transverse plates 413 connected between the two vertical plates 412, the positioning frame 41 encloses a receiving area 410 for receiving the tray 3, and the two chuck members 42 are slidably connected to the two transverse plates 413. The corner of the vertical plate 412 connected with the transverse plate 413 extends upwards to form a retaining member 414, and the retaining member 414 is used for enclosing a plurality of stacked trays 3 so as to define the positions of the trays 3.

The chuck member 42 includes a sliding plate 421 and a hook portion 422 connected to the sliding plate 421 and extending toward the accommodating area 410 of the positioning frame 41, the sliding plate 421 is slidably connected to the transverse plate 413, and the hook portion 422 is used for carrying the tray 3. The two transverse plates 413 are connected with sliding rails, the sliding plates 421 are provided with sliding grooves, and the sliding rails are slidably embedded in the sliding grooves.

The lifting assembly 43 is a double-stroke cylinder. The bottom plate 411 has a through hole 415, and the cylinder body of the double-stroke cylinder is fixed on the bottom plate 411 and penetrates through the through hole 415 to support the tray 3 above the bottom plate 411. One end of the double stroke cylinder is provided with a bearing plate 45 for bearing the tray 3.

The conveying assembly 44 includes a motor 441 fixed on the bottom plate 411, two conveyor belts 442 located inside the two longitudinal plates 412, and a conveying member 443 connected between the motor 441 and the two conveyor belts 442, where the two conveyor belts 442 are used for carrying the tray 3 and conveying the tray 3 onto the carrying assembly 21. The carrying assembly 21 further includes a transfer assembly 219 coupled to the substrate 211, and the transfer assembly 219 is configured to transfer the tray 3 transferred by the transfer assembly 44 to a predetermined position. The structure of the transfer assembly 219 is substantially the same as that of the transfer assembly 44 and will not be described in detail herein.

The automatic tray positioning device 100 includes a plurality of second positioning devices 4 disposed on a plurality of layers, and in the embodiment of the present application, the automatic tray positioning device 100 includes two layers of second positioning devices 4, where each layer of second positioning device 4 includes two second positioning devices 4 corresponding to two first positioning devices 2. The tray 3 placed on the second positioning device 4 at the upper layer is used for accommodating materials to be processed or to be tested, and the second positioning device 4 at the lower layer is used for placing processed or tested materials transmitted from the first positioning device 2.

The positioning device of the tray 3 further comprises a lifting mechanism 5, wherein the lifting mechanism 5 is connected with the first positioning device 2 and is used for lifting the first positioning device 2 to be aligned with the second positioning device 4 on the upper layer or aligned with the second positioning device 4 on the lower layer. Specifically, the lifting mechanism 5 includes a screw 51 and a motor 52, the screw 51 is connected to the first positioning device 2, and the motor 52 is used to drive the screw 51 to rotate, so that the first positioning device 2 moves up and down along the screw 51. The transfer assembly 219 is also used to transfer the tray 3 on the second positioning device 4 to the first positioning device 2 when the first positioning device 2 is aligned with the underlying second positioning device 4.

Specifically, after all the materials on the trays 3 located on the first positioning device 2 are processed or tested, when the materials need to be transferred to the second positioning device 4, the chuck members 42 located on the second positioning device 4 at the lower layer are in a mutually separated state, so that the following trays 3 can be moved between the two chuck members 42 to bear the trays 3 through the hooks 422, and the process of transferring the materials to the second positioning device 4 is as follows: the lifting mechanism 5 drives the first positioning device 2 to be opposite to the second positioning device 4, the conveying assembly 219 is started to reversely convey the tray 3 on the first positioning device 2 to the second positioning device 4, the tray 3 is borne on the conveying assembly, then the lifting assembly 43 drives the tray 3 from the first positioning device 2 to move upwards towards the tray member 42, and when the tray 3 on the conveying assembly moves upwards to the position of the tray member 42, the tray member 42 moves towards the tray 3 to bear the tray 3. In this way, the tray 3 is positioned, completing the transfer of the processed or tested material.

It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application.

The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The automatic positioning device for the material tray is characterized by comprising a first positioning device and a second positioning device;

the first positioning device includes:

the second positioning device includes:

2. The tray automatic positioning device according to claim 1, wherein the first positioning device further comprises a positioning sensing member, the carrying assembly comprises a substrate, the substrate comprises a first end and a second end opposite to each other, the first end has the inlet, the positioning sensing member is fixed to the second end of the substrate, and the positioning sensing member is used for detecting whether the tray is placed at the predetermined position.

3. The tray automatic positioning device according to claim 2, wherein a baffle plate facing the inlet is fixed to the second end of the base plate, and the predetermined position is that the tray abuts against the baffle plate.

4. The tray automatic positioning device according to claim 2, wherein the carrying assembly further comprises a clamping assembly, the clamping assembly is located at a first end of the base plate, the clamping assembly comprises a first driving member fixed on the base plate and a moving member connected with the first driving member, the first driving member is used for driving the moving member to move away from the second end so as to conveniently place the tray at a preset position, and driving the moving member to move towards the second end so as to clamp the tray when the tray is placed at the preset position.

5. The automatic tray positioning device according to claim 1, wherein the rotating assembly comprises a fixed plate, a second driving member, a rotating member and a connecting member, the second driving member is fixed on the fixed plate, the rotating member is connected with the second driving member and is rotatably connected to the fixed plate, and the connecting member is fixedly connected with the bearing assembly.

6. The automatic tray positioning device according to claim 5, wherein the rotating assembly further comprises a plurality of positioning sensing members fixed on the fixed plate, the bearing assembly comprises a positioning member, the plurality of positioning sensing members are circumferentially distributed around the rotating member, two positioning sensing members among the plurality of positioning sensing members are located on a circumferential diameter line, and the plurality of positioning sensing members are used for sensing the positioning members.

7. The automatic tray positioning device according to claim 1, wherein the automatic tray positioning device comprises a plurality of first positioning devices arranged side by side, the first positioning device further comprises a moving assembly connected with the rotating assembly and used for driving the rotating assembly to move back and forth, and the moving direction of the moving assembly is parallel to the plane where the rotating direction of the bearing assembly is located.

8. The automatic tray positioning device according to claim 1, wherein the second positioning device further comprises a positioning frame, a tray clamping member and a lifting assembly, the tray clamping member is slidably connected to the positioning frame and is located above the conveying assembly, the tray clamping member is used for bearing the tray, the lifting assembly is connected with the positioning frame and used for moving upwards to support the tray to enable the tray clamping member to slide away from the tray along the positioning frame, and moving downwards to enable the tray to descend by a tray height distance to enable the tray clamping member to slide back between two adjacent trays to bear the tray again, and the lifting assembly is further used for continuing moving downwards to enable the tray to be borne on the conveying assembly when the tray clamping member is clamped between the two adjacent trays.

9. The automatic tray positioning device according to claim 8, wherein the chuck member comprises a sliding plate and a hook portion connected to the sliding plate and extending toward the receiving area of the positioning frame, the sliding plate being slidably connected to the positioning frame, the hook portion being for carrying the tray.

10. The tray automatic positioning device according to claim 8, further comprising a lifting mechanism and a plurality of the second positioning devices disposed on a plurality of layers, the lifting mechanism being connected to the first positioning device for lifting the first positioning device into alignment with one of the plurality of the second positioning devices, the carrying assembly further comprising a transfer assembly for transferring the tray on the second positioning device to the first positioning device when the first positioning device is aligned with one of the plurality of the second positioning devices, the lifting assembly further being for driving the tray from the first positioning device to move toward the chuck member, the chuck member moving toward the tray to carry the tray when the tray on the transfer assembly moves upward to a position with the chuck member.