A turnover box stacking device

By designing a turnover box stacking device, using a clamping unit and a flat panel antenna to identify materials, and a lifting unit and a fork arm unit to achieve destacking or stacking, the problem of the handling robot being unable to efficiently identify and process materials is solved, thus improving production efficiency.

CN224429424UActive Publication Date: 2026-06-30FUJIAN TONGLIDA IND

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
FUJIAN TONGLIDA IND
Filing Date
2025-07-01
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing handling robots are unable to identify, verify, and bind material information, and cannot efficiently complete palletizing and depalletizing work, resulting in low production efficiency.

Method used

Design a turnover box depalletizing device, comprising a frame, a shell, a clamping unit, a flat panel antenna, a lifting unit, and a fork arm unit. The clamping unit clamps the unpowered turnover cart, the flat panel antenna scans and identifies materials from all directions, and the lifting unit and fork arm unit realize depalletizing or stacking operations.

Benefits of technology

It enables efficient identification, depalletizing, and palletizing of materials, improving production efficiency, preventing mechanical squeezing and falling caused by material positional deviation, and enhancing overall production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a turnover box stacking device, including a frame and a shell. The shell is connected to the frame as a whole by fasteners. This invention uses a clamping unit to clamp and position the unpowered turnover cart, stabilizing the turnover box and the materials inside. A flat panel antenna is used to scan and identify the materials inside the turnover box from all directions, ensuring that the materials inside the turnover box can be identified. Then, according to the production line and requirements, the lifting unit and the fork arm unit are controlled to destacking or stacking the turnover box. Compared with the traditional production line where the positions of the two processes need to be changed, this invention directly completes multiple processes in one device. It can accurately center the materials and prevent mechanical compression damage to the turnover box caused by the fork arm structure during the lifting process due to the displacement of the material turnover box position, and prevent the turnover box and materials from falling during lifting. It can also directly and efficiently identify, destacking, and stacking the materials in the turnover box, thereby improving production efficiency.
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Description

Technical Field

[0001] This utility model relates to a turnover box stacking device, belonging to the field of automated devices for stacking or destacking turnover boxes. Background Technology

[0002] A turnover box is a logistics packaging container mainly used for the storage, transportation and circulation of goods. It features lightweight materials, waterproof and corrosion-resistant properties, and the ability to be replaced, recycled and reused.

[0003] As the technology of intelligent handling robots such as AGVs and RGVs matures, related equipment has been widely used in warehouse management across various industries. However, in practical applications, handling robots, as handling tools, have a single purpose and cannot identify, verify, or bind the materials being handled. They also cannot perform tasks such as palletizing, depalletizing, or reassembling the material turnover boxes being handled. Customizing handling robots with corresponding functions would face problems such as inaccurate information identification, complex equipment structure, and excessively high research and development and production costs.

[0004] The existing production process is as follows: materials are first transported by a handling robot into the identification equipment for information identification and verification, and then, according to system requirements, they come out of the identification equipment and enter the depalletizing or palletizing equipment for depalletizing or palletizing. The overall efficiency is low.

[0005] In response, this utility model provides a turnover box stacking device, which uses a handling robot to enter the device, directly identify and verify the information of the equipment in the turnover box, and then continue to unstack or stack according to system requirements, thereby improving overall efficiency. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a turnover box depalletizing device for efficient identification, depalletizing and stacking of materials.

[0007] This utility model is implemented as follows:

[0008] A turnover box stacking device includes a frame and a shell, wherein the shell is connected to the frame as a whole by fasteners, and the front end face of the shell has a port in the middle for a non-powered turnover vehicle to enter or move out of the frame.

[0009] This utility model also includes a clamping unit and a non-powered turnover cart. The non-powered turnover cart can be used to place several turnover boxes. There are two clamping units, which are symmetrically installed inside the bottom of the frame. The clamping units are used to clamp and position the non-powered turnover cart.

[0010] This utility model also includes a flat panel antenna, in several quantities, installed around the inside of the frame, for scanning and identifying materials inside the turnover box from all directions.

[0011] This utility model also includes a lifting unit, a fork arm unit, and a guide rail fixed on the vertical part of the frame. There are several fork arm units, which are symmetrically arranged and located directly above the clamping unit for clamping turnover boxes. The lifting unit is located at the top center of the frame. The output end of the lifting unit drives the fork arm unit to slide up and down in the guide rail through a chain to realize the unstacking or stacking of turnover boxes.

[0012] As a further improvement, the clamping unit includes a base plate and two horizontal linear bearings, which are fixed in parallel at the front and rear ends of the base plate.

[0013] The clamping unit also includes a first clamping plate, a first optical axis and a first electric push rod. The first end of the first electric push rod is fixed to the base plate between two horizontal linear bearings by a bracket. One end of the first optical axis slides in the horizontal linear bearing, while the tail ends of the first electric push rod and the first optical axis are both fixed to the first clamping plate.

[0014] This ensures that the first electric push rod smoothly drives the first clamping plate to make horizontal linear motion.

[0015] As a further improvement, the clamping unit also includes a second clamping plate and a second electric push rod. There are two second clamping plates, which are located at the front and rear ends of the first clamping plate, respectively. The second clamping plates are installed at the ends of the second clamping plates by means of the second electric push rod. The second electric push rod extends and retracts to drive the second clamping plates to perform linear motion.

[0016] The first electric push rod extends and drives the first clamping plate to horizontally clamp the unpowered turnover cart, and the second electric push rod retracts and drives the second clamping plate to clamp the unpowered turnover cart at both ends, so that it is in a clamping state.

[0017] Conversely, after the first electric push rod retracts, it moves the first clamping plate horizontally away from the unpowered turnover cart, and the second electric push rod extends, moving the second clamping plate away from the unpowered turnover cart, thus releasing it.

[0018] As a further improvement, the clamping unit also includes a second linear bearing and a second optical axis. The second optical axis is arranged parallel to the second electric push rod. One end of the second optical axis is fixed to the second clamping plate, and the other end passes through the end of the first clamping plate and slides in the second linear bearing.

[0019] As a further improvement, the fork arm unit includes a clamping plate and sliders. Several sliders are fixed on the first end face of the clamping plate. The sliders are arranged in an array, and each slider slides in cooperation with the guide rail.

[0020] As a further improvement, the fork arm unit also includes a clamp, a rack, and a linear reciprocating motor. The linear reciprocating motor is mounted on the first end face of the clamp plate, and the output end of the linear reciprocating motor meshes with the first end of the rack. The tail end of the rack passes through the clamp plate and is fixed to the clamp, so that the clamp can perform horizontal linear motion.

[0021] As a further improvement, the fork arm unit also includes two third optical axes and a third linear bearing. The third linear bearing is installed between two sliders on the same horizontal line. One end of the third optical axis is fixed to the clamp, and the other end is slidably engaged with the third linear bearing.

[0022] As a further improvement, the lifting unit includes a motor, a reducer, a drive shaft, a mounted bearing, and a main sprocket;

[0023] The speed reducer is installed in the center of the frame. The input end of the speed reducer is locked to the output end of the motor. Bearings with mounting plates are installed on both sides of the frame on the horizontal sides of the speed reducer. The drive shaft passes through the speed reducer and the bearings with mounting plates, respectively. The main sprocket is connected to the drive shaft by a flat key.

[0024] As a further improvement, the fork arm unit also includes chain connectors, a number of which are installed at the upper and lower ends of the first end face of the clamping plate;

[0025] A sprocket is mounted on the base plate between the two first optical axes via a second bearing seat;

[0026] One end of the chain is fixed to the chain connector at the upper end of the clamping plate, and the other end passes around the main sprocket in sequence and is fixed to the chain connector at the lower end of the clamping plate from behind the sprocket.

[0027] This allows the output of the lifting unit to drive the fork arm unit to slide up and down in the guide rail via a chain.

[0028] As a further improvement, the housing is a sheet metal housing.

[0029] The beneficial effects of this utility model are as follows: This utility model first selectively places a certain number of turnover boxes on a non-powered turnover cart, or does not place turnover boxes at all. The non-powered turnover cart is moved from the outer shell into the frame. The non-powered turnover cart is clamped and positioned by a clamping unit, while stabilizing the turnover boxes and the materials inside them. A flat panel antenna is used to scan and identify the materials inside the turnover boxes from all directions, ensuring that the materials inside the turnover boxes can be identified. Then, according to the production line and requirements, the lifting unit and the fork arm unit are controlled to destacking or stacking the turnover boxes. Compared with the traditional production line where the positions of the two processes need to be changed, this utility model directly completes multiple processes in one device. It can accurately center the materials and prevent mechanical squeezing damage to the turnover boxes caused by the fork arm structure during forklifting due to the displacement of the material turnover boxes. It also prevents the turnover boxes and materials from falling down during lifting. It can also directly and efficiently identify, destacking, and stacking the turnover boxes, thereby improving production efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the unused state of a turnover box stacking device provided in an embodiment of this utility model.

[0032] Figure 2 This is a schematic diagram of the structure of a turnover box stacking device in use, provided by an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the internal structure of a turnover box stacking device provided in an embodiment of the present invention.

[0034] Figure 4 This is a front view of the internal structure of a turnover box stacking device provided in an embodiment of the present invention.

[0035] Figure 5 This is a top view of the internal structure of a turnover box stacking device provided in this embodiment of the utility model.

[0036] Figure 6 This is a side view of the internal structure of a turnover box stacking device provided in an embodiment of the present utility model.

[0037] Figure 7 This is a partial structural diagram of a turnover box stacking device provided in an embodiment of the present invention. Figure 1 .

[0038] Figure 8 This is a partial structural diagram of a turnover box stacking device provided in an embodiment of the present invention. Figure 2 .

[0039] Figure 9 This is a partial structural diagram of a turnover box stacking device provided in an embodiment of the present invention. Figure 3 .

[0040] Figure 10 This is a partial structural diagram of a turnover box stacking device provided in an embodiment of the present invention. Figure 4 .

[0041] Reference numerals: Frame 1, Outer shell 2, Lifting unit 3, Fork arm unit 4, Clamping unit 5, Flat panel antenna 6, Unpowered trolley 7, Chain 8, Clamping plate 41, Clamp 42, Slider 43, Chain connector 44, Third linear bearing 45, Third optical axis 46, Rack 47, Linear reciprocating motor 48, First end face 411, Motor 31, Reducer 32, Drive shaft 33, Bearing with seat 34, Main sprocket 35, Driven sprocket 36, Base plate 51, First clamping plate 52, Second clamping plate 53, Horizontal linear bearing 54, First optical axis 55, First electric push rod 56, Second linear bearing 57, Second optical axis 58, Second electric push rod 59, Port 201. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0043] 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 or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Reference Figures 1 to 10 As shown, this embodiment provides a specific implementation of a turnover box stacking device, including a frame 1 and a shell 2. The shell 2 is connected to the frame 1 as a whole by fasteners. The front end face of the shell 2 has a port 201 in the middle for a non-powered turnover trolley 7 to enter or move out of the frame 1.

[0045] This utility model also includes a clamping unit 5 and a non-powered turnover cart 7. The non-powered turnover cart 7 can be used to place several turnover boxes. There are two clamping units 5, which are symmetrically installed inside the bottom of the frame 1. The clamping units 5 are used to clamp and position the non-powered turnover cart 7.

[0046] This utility model also includes a flat panel antenna 6, in several quantities, mounted around the inside of the frame 1, for scanning and identifying materials in the turnover box from all directions. The flat panel antenna 6 refers to an antenna that propagates only in one specific direction.

[0047] This utility model also includes a lifting unit 3, a fork arm unit 4, and a guide rail 101 fixed on the vertical part of the frame 1. There are two fork arm units 4, which are symmetrically arranged and located directly above the clamping unit 5, and are used to clamp the turnover boxes. The lifting unit 3 is located at the top center of the frame 1. The output end of the lifting unit 3 drives the fork arm unit 4 to slide up and down in the guide rail 101 through the chain 8, so as to realize the unpacking or stacking of the turnover boxes.

[0048] In the above technical solution, this utility model first selectively places a certain number of turnover boxes or does not place turnover boxes on the non-powered turnover cart 7, moves the non-powered turnover cart 7 from the outer shell 2 into the frame 1, uses the clamping unit 5 to clamp and position the non-powered turnover cart 7, and stabilizes the turnover boxes and the materials inside the turnover boxes. The flat panel antenna 6 scans and identifies the materials inside the turnover boxes from all directions to ensure that the materials inside the turnover boxes can be identified. Then, according to the production line and requirements, the lifting unit 3 and the fork arm unit 4 are controlled to destacking or stacking the turnover boxes. Compared with the traditional production line where the positions of the two processes need to be changed, this utility model directly completes multiple processes in one device, which can accurately center the materials and prevent mechanical squeezing damage to the turnover boxes caused by the fork arm structure when picking up the materials due to the displacement of the turnover box position. It also prevents the turnover boxes and materials from falling down when lifting. It can also directly and efficiently identify, destacking, and stacking the turnover boxes, thereby improving production efficiency.

[0049] The specific structure and principle for achieving the above functions are as follows:

[0050] In this embodiment, the clamping unit 5 includes a base plate 51 and two horizontal linear bearings 54, which are fixed in parallel at the front and rear ends of the base plate 51.

[0051] The clamping unit 5 further includes a first clamping plate 52, a first optical axis 55, and a first electric push rod 56. The first end of the first electric push rod 56 is fixed to the base plate 51 between two horizontal linear bearings 54 by a bracket. One end of the first optical axis 55 slides in the horizontal linear bearing 54, while the tail ends of the first electric push rod 56 and the first optical axis 55 are both fixed to the first clamping plate 52, so that the first electric push rod 56 can smoothly drive the first clamping plate 52 to perform horizontal linear motion.

[0052] Secondly, the clamping unit 5 also includes a second clamping plate 53 and a second electric push rod 59. There are two second clamping plates 53, which are located at the front and rear ends of the first clamping plate 52 respectively. The second clamping plates 53 are installed at the ends of the second clamping plates 53 by the second electric push rod 59. The second electric push rod 59 extends and retracts to drive the second clamping plates 53 to perform linear motion.

[0053] The first electric push rod 56 extends and drives the first clamping plate 52 to horizontally clamp the unpowered turnover cart 7, while the second electric push rod 59 retracts and drives the second clamping plate 53 to clamp the unpowered turnover cart 7 at both ends, thus achieving a clamping state; conversely, when the first electric push rod 56 retracts, it drives the first clamping plate 52 to horizontally move away from the unpowered turnover cart 7, while the second electric push rod 59 extends and drives the second clamping plate 53 to move away from the unpowered turnover cart 7, thus achieving a released state.

[0054] The structure and principle of the clamping unit 5 are described in detail in the above scheme. The clamping unit 5 clamps the horizontal ends and the front and rear ends of the unpowered turnover cart 7. After positioning the unpowered turnover cart 7, it will not slide again due to the sliding ability of the unpowered turnover cart 7. The positioning effect is good and the stability is strong.

[0055] As one possible implementation of the clamping unit 5, the clamping unit 5 further includes a second linear bearing 57 and a second optical axis 58. The second optical axis 58 is arranged parallel to the second electric push rod 59. One end of the second optical axis 58 is fixed on the second clamping plate 53, and the other end passes through the end of the first clamping plate 52 and slides in the second linear bearing 57, thereby enhancing the stability of the second clamping plate 53 in linear motion.

[0056] In this embodiment, the fork arm unit 4 includes a clamping plate 41 and sliders 43. A plurality of sliders 43 are fixed on the first end face 411 of the clamping plate 41. The sliders 43 are arranged in an array, and each slider 43 slides in cooperation with the guide rail 101.

[0057] Furthermore, the fork arm unit 4 also includes a clamp 42, a rack 47, and a linear reciprocating motor 48. The linear reciprocating motor 48 is mounted on the first end face 411 of the clamp plate 41, and the output end of the linear reciprocating motor 48 meshes with the head end of the rack 47. The tail end of the rack 47 passes through the clamp plate 41 and is fixed to the clamp 42, so that the clamp 42 can perform horizontal linear movement.

[0058] As one possible specific implementation of the fork arm unit 4, the fork arm unit 4 also includes two third optical axes 46 and a third linear bearing 45. The third linear bearing 45 is installed between two sliders of the slider 43 on the same horizontal line. One end of the third optical axis 46 is fixed on the clamp 42, and the other end is slidably engaged with the third linear bearing 45.

[0059] The above technical solution describes in detail the structure and principle of the fork arm unit 4. It uses a rack 47 and a linear reciprocating motor 48 as the means of telescopic adjustment, which makes it easier to make fine adjustments and is suitable for different turnover boxes of different thicknesses.

[0060] In this embodiment, the lifting unit 3 includes a motor 31, a reducer 32, a drive shaft 33, a bearing 34 with a mounting plate, and a main sprocket 35. The reducer 32 is installed in the center of the frame 1, and the input end of the reducer 32 is locked to the output end of the motor 31. Bearings 34 with mounting plates are installed on both sides of the frame 1 on the horizontal sides of the reducer 32. The drive shaft 33 passes through the reducer 32 and the bearing 34 with mounting plates, respectively. The main sprocket 35 is connected to the drive shaft 33 by a flat key.

[0061] Furthermore, the fork arm unit 4 also includes chain connectors 44, of which there are two, installed at the upper and lower ends of the first end face 411 of the clamping plate 41; a driven sprocket 36 is installed on the base plate 51 between the two first optical shafts 55 via a second bearing seat; one end of the chain 8 is fixed to the chain connector 44 at the upper end of the clamping plate 41, and the other end passes through the main sprocket 35 and the driven sprocket 36 in sequence before being fixed to the chain connector 44 at the lower end of the clamping plate 41; so that the output end of the lifting unit 3 drives the fork arm unit 4 to slide up and down in the guide rail 101 via the chain 8.

[0062] The above technical solution describes in detail the structure and principle of the lifting unit 3, which can realize the power output of the lifting unit 3 to drive the fork arm unit 4 to make vertical linear motion.

[0063] In this embodiment, both the frame 1 and the outer shell 2 are made of metal materials, which have high hardness, strong load-bearing capacity, and are not easily deformed. For example, the frame 1 is made of aluminum profile, and the outer shell 2 is a sheet metal shell.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stacking device for turnover boxes, characterized in that, It includes a frame (1) and a shell (2), the shell (2) being connected to the frame (1) as a whole by fasteners, wherein the front end face of the shell (2) has a port (201) in the middle for a non-powered turnover vehicle (7) to enter or move out of the frame (1); It also includes a clamping unit (5) and a non-powered turnover cart (7). The non-powered turnover cart (7) can be used to place several turnover boxes. There are two clamping units (5), which are symmetrically installed at the bottom of the frame (1). The clamping unit (5) is used to clamp and position the non-powered turnover cart (7). It also includes a flat panel antenna (6), in several quantities, installed around the inside of the frame (1), for scanning and identifying the materials in the turnover box from all directions; It also includes a lifting unit (3), a fork arm unit (4), and a guide rail (101) fixed on the vertical part of the frame (1). There are two fork arm units (4), which are symmetrically arranged and located directly above the clamping unit (5) for clamping turnover boxes. The lifting unit (3) is located at the top center of the frame (1). The output end of the lifting unit (3) drives the fork arm unit (4) to slide up and down in the guide rail (101) through the chain (8) to realize the unpacking or stacking of turnover boxes.

2. The turnover box stacking device according to claim 1, characterized in that, The clamping unit (5) includes a base plate (51) and two horizontal linear bearings (54), which are fixed in parallel at the front and rear ends of the base plate (51). The clamping unit (5) further includes a first clamping plate (52), a first optical axis (55) and a first electric push rod (56). The first end of the first electric push rod (56) is fixed to the base plate (51) between two horizontal linear bearings (54) by a bracket. One end of the first optical axis (55) slides in the horizontal linear bearing (54), while the tail ends of the first electric push rod (56) and the first optical axis (55) are both fixed to the first clamping plate (52). This allows the first electric push rod (56) to smoothly drive the first clamping plate (52) to make horizontal linear motion.

3. The turnover box stacking device according to claim 2, characterized in that, The clamping unit (5) also includes a second clamping plate (53) and a second electric push rod (59). There are two second clamping plates (53), which are located at the front and rear ends of the first clamping plate (52) respectively. The second clamping plate (53) is installed at the end of the second clamping plate (53) through the second electric push rod (59). The second electric push rod (59) extends and retracts to drive the second clamping plate (53) to perform linear motion. So that after the first electric push rod (56) extends, it drives the first clamping plate (52) to horizontally clamp the unpowered turnover cart (7), and the second electric push rod (59) retracts to drive the second clamping plate (53) to clamp the unpowered turnover cart (7) at both ends, and is in a clamping state; Conversely, after the first electric push rod (56) retracts, it drives the first clamping plate (52) to move horizontally away from the unpowered turnover vehicle (7), and the second electric push rod (59) extends, driving the second clamping plate (53) to move away from the unpowered turnover vehicle (7), and is in a released state.

4. The turnover box stacking device according to claim 3, characterized in that, The clamping unit (5) also includes a second linear bearing (57) and a second optical axis (58). The second optical axis (58) is arranged parallel to the second electric push rod (59). One end of the second optical axis (58) is fixed on the second clamping plate (53), and the other end passes through the end of the first clamping plate (52) and slides in the second linear bearing (57).

5. The turnover box stacking device according to claim 1, characterized in that, The fork arm unit (4) includes a clamp plate (41) and sliders (43). Several sliders (43) are fixed on the first end face (411) of the clamp plate (41). The sliders (43) are arranged in an array, and each slider (43) slides in cooperation with the guide rail (101).

6. The turnover box stacking device according to claim 5, characterized in that, The fork arm unit (4) also includes a clamp (42), a rack (47) and a linear reciprocating motor (48). The linear reciprocating motor (48) is mounted on the first end face (411) of the clamp plate (41), and the output end of the linear reciprocating motor (48) meshes with the head end of the rack (47). The tail end of the rack (47) passes through the clamp plate (41) and is fixed to the clamp (42), so that the clamp (42) can make horizontal linear motion.

7. The turnover box stacking device according to claim 6, characterized in that, The fork arm unit (4) also includes two third optical axes (46) and a third linear bearing (45). The third linear bearing (45) is installed between two sliders of the slider (43) on the same horizontal line. One end of the third optical axis (46) is fixed on the clamp (42), and the other end is slidably engaged with the third linear bearing (45).

8. The turnover box stacking device according to claim 1, characterized in that, The lifting unit (3) includes a motor (31), a reducer (32), a drive shaft (33), a bearing with a mounting seat (34), and a main sprocket (35); The reducer (32) is installed in the middle of the frame (1). The input end of the reducer (32) is locked to the output end of the motor (31). Mounted bearings (34) are installed on the frame (1) on both sides of the reducer (32). The drive shaft (33) passes through the reducer (32) and the mounted bearings (34) respectively. The main sprocket (35) is connected to the drive shaft (33) by a flat key.

9. The turnover box stacking device according to claim 5, characterized in that, The fork arm unit (4) also includes chain connectors (44), and there are two chain connectors (44), which are installed at the upper and lower ends of the first end face (411) of the clamp plate (41); A sprocket (36) is mounted on the base plate (51) between the two first optical axes (55) via a second bearing seat; One end of the chain (8) is fixed to the chain connector (44) at the upper end of the clamp plate (41), and the other end passes around the main sprocket (35) and is fixed to the chain connector (44) at the lower end of the clamp plate (41) after the sprocket (36). The output end of the lifting unit (3) drives the fork arm unit (4) to slide up and down in the guide rail (101) via the chain (8).

10. The turnover box stacking device according to claim 1, characterized in that, The outer shell (2) is a sheet metal shell.