Tray recovery device and prepared material transfer system

Abstract

The utility model relates to the technical field of automatic production lines, and discloses a tray recovery device and a prepared material transfer system, the device comprises a rack, a bearing trolley and a lifting assembly; the machine frame is divided into an upper area and a lower area, the area below the machine frame is a recycling area, the area above the machine frame is a storage area, the recycling area is communicated with the storage area, the storage area is used for storing the stacked trays, the recycling area is used for containing the bearing trolley, and the lifting assembly is arranged on the machine frame and located below the recycling area. The scheme is used for recycling trays for bearing prepared materials in the prepared material transfer system, the bearing trolley is used for bearing the trays and moving the trays to the recycling area below the rack, the lifting assembly lifts the trays borne by the bearing trolley, separates the trays from the bearing trolley and moves the trays to the storage area above the rack, and a plurality of trays can be stacked in the storage area; the trays can be transferred through an outlet of the storage area, so that the automatic tray recycling process is achieved, and the automation degree of the production line is further improved.

Description

Technical Field

[0001] This utility model relates to the field of automated production line technology, specifically to a pallet recycling device and a material transfer system. Background Technology

[0002] Automated production processes typically include loading, sorting, processing, and unloading. In conventional loading processes, materials are usually transported via conveyor belts to a sorting station and then to the processing station for production, or directly to the processing station. However, for heavy materials like steel plates, direct delivery to the processing station, lacking a buffer station, makes continuous loading difficult. Therefore, it is necessary to establish a material preparation station to pre-stock materials and to determine how to move these prepared materials to the loading station.

[0003] Chinese patent CN202020617972.6 discloses a transfer device for steel plate logistics supply chain, including an electric forklift. A controller is connected to an electrical box on the side wall of the electric forklift, and electrically telescopic forks are installed on the forks. An adjustable stacking structure is connected to the side wall of the electric forklift. This solution solves the problem of non-stacking transfer, but it does not disclose a method for recycling pallets carrying the materials after transfer.

[0004] This invention overcomes the shortcomings of the prior art by providing a pallet recycling device and a material transfer system. The recycling device is used to recycle the pallets carrying the materials after the materials have been transferred. Utility Model Content

[0005] The main purpose of this utility model is to provide a pallet recycling device, including a frame, a carrying trolley, and a lifting assembly; the frame is divided into upper and lower areas, the lower area of ​​the frame is a recycling area, and the upper area is a storage area, the recycling area is connected to the storage area, the storage area is used to store multiple stacked pallets, and the stacked pallets are removed through the outlet of the storage area;

[0006] The recycling area is used to accommodate the carrying trolley, which carries the pallet and moves the pallet through the inlet of the recycling area into the recycling area.

[0007] The lifting assembly is located on the frame below the recycling area and is used to lift and separate the pallet from the carrying trolley, moving it from below the storage area to the interior of the storage area.

[0008] Optionally, vertical limiting rods are provided on both sides of the outlet direction of the storage area. The limiting rods are fixedly connected to the frame and are used to limit the sides of the pallet. A receiving shaft is provided at the bottom of the limiting rod. The receiving shaft supports the bottom of the pallet and is distributed at the four corners of the bottom of the storage area.

[0009] Optionally, during the process of the lifting component moving the pallet from the recycling area to the storage area, the top of the pallet contacts the receiving shaft, causing the receiving shaft to flip upwards and the pallet to enter the storage area;

[0010] When the pallet is lifted by the lifting component to a height higher than the receiving shaft, the lifting component returns to its original position, the bottom of the pallet contacts the receiving shaft, causing the receiving shaft to flip downwards to a horizontal position, and the receiving shaft supports the bottom of the pallet, so that the pallet is located in the storage area.

[0011] Optionally, the receiving shaft includes a connecting seat, a connecting shaft, and a rotating surface; one end of the connecting shaft is hinged to the connecting seat, and the other end is connected to the rotating surface; the rotating surface covers the circumferential surface of the connecting shaft and rotates about the connecting shaft as an axis, and the rotating surface contacts the tray; the connecting seat is fixedly connected to the frame; the hinge point between the connecting shaft and the connecting seat is provided with an arc surface and a flat surface, and the connecting shaft rotates within the range of the arc surface;

[0012] During the process of the lifting component moving the tray from the recycling area to the storage area, the top of the tray contacts the rotating surface, causing the connecting axis to rotate upward, and the plane separates from the surface of the connecting seat.

[0013] When the pallet is lifted by the lifting component to a height higher than the receiving shaft, the lifting component returns to its original position, the bottom of the pallet contacts the rotating surface, causing the connecting shaft to rotate downwards, the receiving shaft supports the bottom of the pallet, the plane is in contact with the surface of the connecting seat, and the connecting shaft is in a horizontal position.

[0014] Optionally, the carrying trolley includes a carrying frame, a roller row, and a roller assembly; the carrying frame is hollow inside for the lifting assembly to pass through; the roller row is located on the upper side of the carrying frame, and when the carrying trolley carries a pallet, the pallet rolls in contact with the roller row, and the roller row is arranged in a direction parallel to the pallet's movement direction; the roller assembly is located on the lower side of the carrying frame, and the roller assembly drives the carrying frame to move.

[0015] Optionally, the roller assembly includes a drive motor, a motor drive belt, two drive pulleys, and two driven pulleys.

[0016] The drive motor is mounted on the support frame and is powered by the motor drive belt. The motor drive belt is powered by the drive wheel. The two drive wheels are linked by a linkage shaft. The two drive wheels and the two driven wheels are distributed at the four corners of the lower side of the support frame.

[0017] Optionally, the carrying trolley includes baffles, which are disposed on both sides of the carrying frame and are parallel to the direction in which the roller row is arranged.

[0018] Optionally, the lifting assembly includes a first push plate and a lifting cylinder. The telescopic end of the lifting cylinder is connected to the first push plate, and the lifting cylinder drives the first push plate to move from the lower part of the recycling area to the upper part of the storage area.

[0019] Optionally, an adjusting cylinder is included, with one adjusting cylinder provided in each of the recovery area and the storage area, and the telescopic end of the adjusting cylinder is connected to a second push plate.

[0020] This utility model also provides a material preparation and transfer system, including the pallet recycling device described above, and further including a material preparation and transfer device, a pallet, and a first guide rail; the pallet is used to place materials; the material preparation and transfer device is located on the side of the first guide rail and is used to transfer the pallet to a carrying trolley; the pallet recycling device is located at the end of the first guide rail, and the beginning of the first guide rail is connected to a feeding assembly; the carrying trolley is located on the first guide rail and moves along the first guide rail, and the carrying trolley is used to carry the pallet.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The pallet recycling device provided by this utility model is used for recycling pallets carrying materials in a material preparation and transfer system. A carrying trolley is used to carry the pallets and move them to the recycling area below the frame. A lifting component lifts the pallets carried by the carrying trolley, separates the pallets from the carrying trolley, and moves them to the storage area above the frame. The storage area can hold multiple pallets, and the pallets can be transferred through the exit of the storage area, thereby realizing the automated pallet recycling process and further improving the automation level of the production line. Attached Figure Description

[0023] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0024] Figure 1 This is a schematic diagram of an embodiment of the pallet recycling device of this utility model. Figure 1 ;

[0025] Figure 2 This is a top view of an embodiment of the pallet recycling device of this utility model;

[0026] Figure 3 Side view of an embodiment of the pallet recycling device of this utility model Figure 1 ;

[0027] Figure 4 Side view of an embodiment of the pallet recycling device of this utility model Figure 2 ;

[0028] Figure 5 This is a schematic diagram of an embodiment of the pallet recycling device of this utility model. Figure 2 ;

[0029] Figure 6 This is a partial enlarged view of embodiment A of the pallet recycling device of this utility model;

[0030] Figure 7 This is a schematic diagram of the material receiving shaft rotation in an embodiment of the pallet recycling device of this utility model;

[0031] Figure 8 This is a cross-sectional view of the receiving shaft in an embodiment of the pallet recycling device of this utility model;

[0032] Figure 9 This is a schematic diagram of an embodiment of the material preparation and transfer system of this utility model.

[0033] Figure label:

[0034] 100-Pallet recycling device; 110-Frame; 111-Recycling area; 112-Storage area; 113-Limit rod; 114-Receiving shaft; 1141-Connecting seat; 1142-Connecting shaft; 1143-Rotating surface; 1144-Arc surface; 1145-Flat surface; 120-Carrying trolley; 121-Carrying frame; 122-Roller row; 123-Roller assembly; 1231-Drive motor; 1232-Motor transmission belt; 1233-Driving wheel; 1234-Driven wheel; 124-Baffle; 130-Lifting assembly; 131-First push plate; 132-Lifting cylinder; 140-Adjusting cylinder; 141-Second push plate; 200-First guide rail; 300-Pallet; 400-Material preparation and transfer device. Detailed Implementation

[0035] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only. In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Thus, unless otherwise stated, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0036] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium, or as a connection within two components. All technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] The pallet is loaded with materials and transported to the loading station or work station via a mobile device (carrying trolley). After unloading, the materials are transported to the pallet recycling device via the carrying trolley. This utility model is used to separate the unloaded pallet from the carrying trolley and collect and recycle it.

[0039] like Figure 1-8 The diagram shown is a schematic representation of an embodiment of the pallet recycling device provided by this utility model.

[0040] Please refer to Figure 1-8This embodiment includes a frame 110, a carrying trolley 120, and a lifting assembly 130. The frame 110 is divided into upper and lower areas. The lower area of ​​the frame 110 is a recycling area 111, and the upper area is a storage area 112. The recycling area 111 and the storage area 112 are connected. The storage area 112 is used to store multiple stacked pallets 300. The stacked pallets 300 are removed through the outlet of the storage area 112.

[0041] The recycling area 111 is used to accommodate the carrying trolley 120, which carries the pallet 300 and moves it through the inlet of the recycling area 111 into the recycling area 111. In this embodiment, the direction of the inlet of the recycling area 111 is perpendicular to the direction of the outlet of the storage area 112. The first guide rail 200 extends into the recycling area 111 from the inlet, and the carrying trolley 120 enters the recycling area 111 along the first guide rail 200.

[0042] The lifting assembly 130 is located on the frame 110, below the recycling area 111, and is used to lift and separate the pallet 300 from the carrying trolley 120, and move the pallet 300 from below the storage area 112 to the inside of the storage area 112, so as to realize the recycling and collection of the pallet 300.

[0043] In one embodiment, vertical limiting rods 113 are provided on both sides of the storage area 112 in the direction of exit. The limiting rods 113 are fixedly connected to the frame 110 and are used to limit the sides of the tray 300. A receiving shaft 114 is provided at the bottom of the limiting rods 113, supporting the bottom of the tray 300. The receiving shafts 114 are distributed at the four corners of the bottom of the storage area 112. There are four limiting rods 113, two on each side, used to limit the sides of the tray 300. The receiving shafts 114 support the bottom of the tray 300, confining the tray 300 within the storage area 112.

[0044] In one embodiment, during the process of the lifting assembly 130 moving the tray 300 from the recycling area 111 to the storage area 112, the top of the tray 300 contacts the receiving shaft 114, causing the receiving shaft 114 to flip upwards, and the tray 300 enters the storage area 112. When the tray 300 is lifted by the lifting assembly 130 to a height higher than the receiving shaft 114, the lifting assembly 130 returns to its original position, and the bottom of the tray 300 contacts the receiving shaft 114, causing the receiving shaft 114 to flip downwards to a horizontal position. The receiving shaft 114 supports the bottom of the tray 300, so that the tray 300 is located within the storage area 112.

[0045] Specifically, such as Figure 6-8As shown, the receiving shaft 114 includes a connecting seat 1141, a connecting shaft 1142, and a rotating surface 1143. One end of the connecting shaft 1142 is hinged to the connecting seat 1141, and the other end is connected to the rotating surface 1143. The rotating surface 1143 covers the circumferential surface of the connecting shaft 1142 and rotates about the connecting shaft 1142 as its axis. The rotating surface 1143 contacts the tray 300. The connecting seat 1141 is fixedly connected to the frame 110. The hinge point between the connecting shaft 1142 and the connecting seat 1141 has an arc surface 1144 and a flat surface 1145, and the connecting shaft 1142 rotates within the range of the arc surface 1144. The receiving shaft 114 can rotate upward and return to a horizontal position. Figure 7 As shown, when the pallet 300 moves from bottom to top, it contacts the horizontal receiving shaft 114, causing the receiving shaft 114 to rotate upward. The pallet 300 then enters the storage area 112. Afterward, the receiving shaft 114 rotates downward under the gravity of the pallet 300 to return to its original horizontal position, thus supporting the pallet 300.

[0046] During the process of the lifting assembly 130 moving the pallet 300 from the recycling area 111 to the storage area 112, the top of the pallet 300 contacts the rotating surface 1143, causing the connecting shaft 1142 to rotate upwards, and the flat surface 1145 to separate from the surface of the connecting seat 1141. When the pallet 300 is lifted by the lifting assembly 130 to a height higher than the receiving shaft 114, the downward pressure of the pallet causes the lifting assembly 130 to return to its original position, and the bottom of the pallet 300 contacts the rotating surface 1143, causing the connecting shaft 1142 to rotate downwards. The receiving shaft 114 supports the bottom of the pallet 300, the flat surface 1145 is in contact with the surface of the connecting seat 1141, and the connecting shaft 1142 is in a horizontal position.

[0047] In addition, when the receiving shaft 114 is in a horizontal state, it is perpendicular to the outlet direction of the storage area 112. When the stacked pallets 300 move along the outlet direction, they come into contact with the rotating surface 1143 of the receiving shaft 114 in a rolling contact manner, which can reduce the friction of the pallet 300 movement.

[0048] In one embodiment, the carrying trolley 120 includes a carrying frame 121, a roller row 122, and a roller assembly 123. The carrying frame 121 is hollow inside to allow the lifting assembly 130 to pass through. The roller row 122 is located on the upper side of the carrying frame 121. When the carrying trolley 120 carries the pallet 300, the pallet 300 rolls in contact with the roller row 122, and the roller row 122 is parallel to the moving direction of the pallet 300. The roller assembly 123 is located on the lower side of the carrying frame 121 and drives the carrying frame 121 to move. The roller row 122 includes a plurality of rollers arranged in sequence to reduce the friction of the pallet 300 when it moves on the carrying trolley 120. There are multiple roller rows 122, and they are arranged in parallel. In the material preparation and transfer system, when the carrying trolley moves to the material preparation and transfer device to receive the prepared material, the roller row 122 is in the same straight line as the chain in the material preparation and transfer device.

[0049] Furthermore, the roller assembly 123 includes a drive motor 1231, a motor drive belt 1232, two drive wheels 1233, and multiple driven wheels 1234. The drive motor 1231 is mounted on the support frame 121 and is poweredly connected to the motor drive belt 1232, which is poweredly connected to the drive wheels 1233. The two drive wheels 1233 are linked together via a linkage shaft. The two drive wheels 1233 and the multiple driven wheels 1234 are distributed on both sides of the lower side of the support frame 121 and are in contact with the first guide rail 200. The roller assembly 123 drives the support trolley 120 to move along the first guide rail 200.

[0050] In addition, the carrying trolley 120 includes baffles 124, which are located on both sides of the carrying frame 121 and are parallel to the direction of the roller row 122. The baffles 124 are used to limit the movement of the pallet 300 on both sides.

[0051] In one embodiment, the lifting assembly 130 includes a first push plate 131 and a lifting cylinder 132. The telescopic end of the lifting cylinder 132 is connected to the first push plate 131. The lifting cylinder 132 drives the first push plate 131 to move from the lower part of the recycling area 111 towards the upper part of the storage area 112. During the movement, it passes through the hollow area of ​​the support frame 121, lifts the pallet 300 carried by the support trolley 120, separates the pallet 300 from the support trolley 120, and lifts the pallet 300 into the storage area 112. In this embodiment, there are two lifting cylinders 132 and two first push plates 131.

[0052] In one embodiment, an adjusting cylinder 140 is also included. An adjusting cylinder 140 is provided in both the recycling area 111 and the storage area 112. The telescopic end of the adjusting cylinder 140 is connected to a second push plate 141. The adjusting cylinder 140 drives the second push plate 141 to push the tray 300, adjusting the position of the tray 300 in the recycling area 111 and the storage area 112, or compensating for the horizontal movement of the tray 300.

[0053] like Figure 9 As shown, this utility model also provides an embodiment of a material preparation and transfer system. This material preparation and transfer system is used to transfer prepared materials and to recycle pallets loaded with prepared materials. The prepared materials can be stacked metal sheets, such as aluminum sheets, steel sheets, etc., and can be moved to the material preparation and transfer device by a forklift or robotic arm. After the materials are transferred, subsequent operations can include stamping, laser cutting, etc.

[0054] This embodiment includes the pallet recycling device 100 described above, and also includes a material transfer device 400, a pallet 300, and a first guide rail 200. The pallet 300 is used to hold materials. The material transfer device 400 is located on the side of the first guide rail 200 and is used to transfer the pallet 300 to a carrying trolley 120. The pallet recycling device 400 is located at the end of the first guide rail 200, and the beginning of the first guide rail 200 is connected to a feeding assembly. The carrying trolley 120 is located on the first guide rail 200 and moves along the first guide rail 200; the carrying trolley 120 is used to carry the pallet 300.

[0055] The material preparation and transfer device 400 receives the pallet 300 and the materials it carries, and transfers the pallet 300 and materials to the carrying trolley 120 on the first track 200. The carrying trolley 120 loads the pallet 300 and materials to the feeding component for unloading. After unloading, the carrying trolley 120 carries the pallet 300 to the pallet recycling device 100, which recycles the pallet. The carrying trolley 120 then moves to the material preparation and transfer device to receive materials. This process is repeated to achieve automated material preparation and automated pallet recycling, ensuring stable feeding of the automated production line and maintaining stable production efficiency. The material preparation and transfer process also provides a buffer period before feeding.

[0056] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tray recycling device, characterized by, The rack, the carrying trolley and the lifting assembly are included; the rack is divided into upper and lower areas, the lower area of the rack is the recycling area, and the upper area is the storage area; the recycling area is communicated with the storage area; the storage area is used for storing a plurality of stacked trays; the stacked trays are removed through the outlet of the storage area; The recycling area is used for accommodating the carrying trolley; the carrying trolley is used for carrying the tray and moving the tray to the inside of the recycling area through the inlet of the recycling area; The lifting assembly is arranged on the rack and located below the recycling area; the lifting assembly is used for lifting and separating the tray from the carrying trolley and moving from below the storage area to the inside of the storage area.

2. The tray recycling device of claim 1, wherein, Two vertical limiting rods are arranged on both sides of the outlet direction of the storage area; the limiting rods are fixedly connected with the rack and used for limiting the two sides of the tray; the bottom of the limiting rod is provided with a receiving shaft; the receiving shaft supports the bottom of the tray; the receiving shaft is distributed in four corners at the bottom of the storage area.

3. The tray recycling device of claim 2, wherein, During the movement of the tray from the recycling area to the storage area by the lifting assembly, the top of the tray is in contact with the receiving shaft, the receiving shaft is turned upward, and the tray enters the storage area; When the lifting height of the tray lifted by the lifting assembly is higher than the receiving shaft, the lifting assembly returns to the original position, the bottom of the tray is in contact with the receiving shaft, the receiving shaft is turned downward to the horizontal position, the receiving shaft supports the bottom of the tray, and the tray is located in the storage area.

4. A tray recycling device according to claim 2 or 3, characterised in that, The receiving shaft includes a connecting seat, a connecting shaft and a rotating surface; one end of the connecting shaft is hinged to the connecting seat, and the other end is connected to the rotating surface; the rotating surface covers the circumferential surface of the connecting shaft and rotates around the connecting shaft; the rotating surface is in contact with the tray; the connecting seat is fixedly connected with the rack; the connecting shaft is provided with a circular surface and a plane at the hinged position of the connecting seat; the connecting shaft rotates within the range of the circular surface. During the movement of the tray from the recycling area to the storage area by the lifting assembly, the top of the tray is in contact with the rotating surface, the connecting shaft is rotated upward, and the plane is separated from the surface of the connecting seat. When the lifting height of the tray lifted by the lifting assembly is higher than the receiving shaft, the lifting assembly returns to the original position, the bottom of the tray is in contact with the rotating surface, the connecting shaft is rotated downward, the receiving shaft supports the bottom of the tray, the plane is attached to the surface of the connecting seat, and the connecting shaft is in the horizontal position.

5. The tray recycling apparatus of claim 1, wherein, The carrying trolley includes a carrying frame, a roller row and a roller assembly; the carrying frame is hollow inside and used for the lifting assembly to pass through; the roller row is arranged on the upper side of the carrying frame; when the carrying trolley carries the tray, the tray is in rolling contact with the roller row; the setting direction of the roller row is parallel to the moving direction of the tray; the roller assembly is arranged on the lower side of the carrying frame and drives the carrying frame to move.

6. The tray recycling device of claim 5, wherein, The roller assembly includes a driving motor, a motor transmission belt, two driving wheels and two driven wheels, The driving motor is arranged on the bearing frame, the driving motor is in power connection with the motor transmission belt, the motor transmission belt is in power connection with the driving wheels, the two driving wheels are connected through the linkage shaft, and the two driving wheels and the two driven wheels are distributed at four corners of the lower side of the bearing frame.

7. The tray recycling apparatus of claim 5, wherein The bearing trolley comprises a baffle, and the baffle is arranged on both sides of the bearing frame and parallel to the arrangement direction of the roller row.

8. The tray recycling apparatus of claim 1, wherein, The lifting assembly comprises a first push plate and a lifting cylinder, the telescopic end of the lifting cylinder is connected with the first push plate, and the lifting cylinder drives the first push plate to move from the lower side of the recycling area to the upper storage area.

9. The tray recycling apparatus of claim 1, wherein, The recycling area and the storage area are each provided with an adjusting cylinder, and the telescopic end of the adjusting cylinder is connected with a second push plate.

10. A stock transfer system characterized by, The tray recycling device comprises the tray recycling device according to any one of claims 1-9, a material preparation transfer device, a tray and a first guide rail; the tray is used for placing material preparation; the material preparation transfer device is arranged on the side of the first guide rail and is used for transferring the tray to the bearing trolley; the tray recycling device is arranged at the end of the first guide rail, and the first end of the first guide rail is connected with the feeding assembly; the bearing trolley is arranged on the first guide rail and moves along the first guide rail, and the bearing trolley is used for bearing the tray.

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