Circulating conveying device

Abstract

The utility model provides a circulating conveying device which comprises a conveying mechanism and lifting mechanisms, and the lifting mechanisms are arranged at the two ends of the conveying mechanism respectively. The conveying mechanism comprises an upper-layer conveying track and a lower-layer conveying track, and the upper-layer conveying track and the lower-layer conveying track are linked through a lifting mechanism; the lifting mechanism comprises a shell, a first driver and a lifting table, and the first driver and the lifting table are arranged in the shell; an output shaft of the first driver is connected with the lifting platform; the lifting table is used for bearing conveyed objects; the first driver is used for driving the lifting platform to lift; the lifting table comprises a table frame and rollers, the rollers are arranged on the table frame, and the upper surfaces of the rollers are used for making contact with conveyed objects. In the horizontal direction, when the lifting table is flush with the upper-layer conveying rail, the upper surfaces of the rollers are smoothly connected with the upper surface of the upper-layer conveying rail. When the lifting table is flush with the lower-layer conveying track, the upper surfaces of the rollers are smoothly connected with the upper surface of the lower-layer conveying track. And the conveying flexibility is enhanced.

Description

Technical Field

[0001] This utility model relates to a conveying device, specifically a circulating conveying device. Background Technology

[0002] Traditional conveying systems primarily focus on horizontal material transport. They fall short when it comes to transporting materials across floors or between different heights, making it difficult to move materials directly from lower to higher levels or vice versa. To address vertical transport issues, additional manual handling or the use of other lifting equipment (such as forklifts and cranes) may be required, which not only increases labor costs but also affects production efficiency and safety. For processes requiring continuous production, vertical material flow may be interrupted, thus impacting the continuity and stability of the entire production line. Utility Model Content

[0003] The purpose of this invention is to provide a circulating conveying device, and the technical problem to be solved is to enhance the flexibility of conveying.

[0004] This utility model is achieved through the following technical solution:

[0005] A circulating conveying device includes a conveying mechanism and a lifting mechanism, wherein the conveying mechanism is provided with lifting mechanisms at both ends;

[0006] The aforementioned conveying mechanism includes an upper conveying track and a lower conveying track, which are linked by a lifting mechanism.

[0007] This conveyor system employs a double-layer structure design with upper and lower conveyor tracks, improving space utilization and allowing more materials or products to be carried within the same floor area. This enhances conveying capacity and flexibility without increasing the footprint. The double-layer structure also allows for independent or collaborative conveying operations between different levels, providing more possibilities for complex logistics needs. Lifting mechanisms are installed at both ends of the conveyor, enabling linkage between the upper and lower conveyor tracks. This allows materials or products to be transferred between the two levels as needed, without manual intervention or complex conversion equipment. This automated lifting and conversion greatly improves the flexibility of the conveying process, enabling rapid response to changing needs in production or logistics. Due to the double-layer conveyor tracks and lifting mechanisms, this system can provide multiple material conveying paths.

[0008] Furthermore, the aforementioned lifting mechanism includes a housing, a first driver, and a lifting platform, wherein the first driver and the lifting platform are disposed within the housing;

[0009] The output shaft of the first driver is connected to the lifting platform; the lifting platform is used to carry the conveyed object; the first driver is used to drive the lifting platform to move up and down.

[0010] The aforementioned lifting mechanism is integrated into the housing, which provides protection for the internal mechanical components, preventing interference and damage from the external environment, and improving the reliability and durability of the equipment.

[0011] Furthermore, the aforementioned lifting platform includes a frame and rollers, with the rollers mounted on the frame and their upper surfaces used to contact the conveyed object.

[0012] The rollers described above are mounted on a frame, with their upper surfaces used to contact and support the conveyed material. Compared to traditional flat-plate lifting platforms, the rollers are designed with lower frictional resistance and higher rolling efficiency, meaning that less driving force is required when the conveyed material moves on the lifting platform, and the movement is smoother and more stable. The rolling characteristics of the rollers also make it easier to position and adjust the conveyed material on the lifting platform, allowing for easy pushing or adjusting of the material's position to adapt to different conveying needs or processing procedures.

[0013] Furthermore, in the horizontal direction, when the aforementioned lifting platform is flush with the upper conveyor track, the upper surface of the aforementioned roller is smoothly connected to the upper surface of the upper conveyor track.

[0014] When the aforementioned lifting platform is flush with the lower conveyor track, the upper surface of the aforementioned rollers smoothly connects with the upper surface of the lower conveyor track.

[0015] When the aforementioned lifting platform is aligned with the upper or lower conveyor track, the upper surface of the rollers smoothly connects with the upper surface of the conveyor track. This means that materials or products can smoothly transition from the lifting platform to the conveyor track or vice versa, avoiding problems such as jamming, bumping, or falling caused by height differences or unevenness. Smooth connection also reduces the impact and vibration experienced by materials or products during transfer, helping to protect their surface integrity and internal quality, which is especially important for fragile or sensitive products. Smooth connection ensures the continuous flow of materials or products during the conveying process, reducing the time wasted due to waiting, adjustment, or repositioning. This continuity improves conveying efficiency, enabling the entire production line or logistics system to process more materials or products faster.

[0016] Furthermore, a first sensor and a second sensor are provided on the side plate of the aforementioned housing. The first sensor is located above the upper conveying track, and the second sensor is located above the lower conveying track.

[0017] The aforementioned first sensor is used to collect the information on the conveyed object on the lifting platform when the lifting platform is at the height of the upper conveyor rail, and then send a first control signal.

[0018] The first sensor mentioned above is used to collect the information of the conveyed object on the lifting platform when the lifting platform is at the height of the lower conveyor rail, and then send a second control signal.

[0019] The first driver is connected to the first sensor and the second sensor, and the first driver is used to receive and execute the first control signal or the second control signal.

[0020] The first sensor is positioned above the upper conveyor track. Its main function is to detect whether there is a conveyed object on the lifting platform when the platform is at the height of the upper conveyor track. Once a conveyed object is detected, the first sensor sends a first control signal to the first driver to execute the corresponding operation (such as stopping the lifting or starting the conveying). The second sensor is positioned above the lower conveyor track. Its function is to detect whether there is a conveyed object on the lifting platform when the platform is at the height of the lower conveyor track. When a conveyed object is detected, the second sensor sends a second control signal to the first driver to trigger different operations (such as adjusting the lifting speed or changing the conveying path). By monitoring the status of the conveyed object on the lifting platform in real time, the sensors can quickly send control signals to the first driver, enabling the conveying device to respond immediately and adjust its working state. This real-time monitoring and response mechanism greatly enhances the flexibility and reaction speed of the conveying device. The first driver, as an actuator, connects to and receives control signals from the first and second sensors. By executing the operations indicated by the control signals, the first driver ensures that the conveying device can work according to a predetermined program or real-time requirements. This integrated function enables the various parts of the conveying device to work together to achieve efficient and flexible conveying tasks.

[0021] Furthermore, the aforementioned lifting platform also includes a second driver, the output shaft of which is connected to a roller; the second driver is used to drive the roller to rotate.

[0022] When the second drive rotates the rollers, the movement of the conveyed material on the lifting platform no longer depends entirely on external thrust or gravity. The active rotation of the rollers provides more stable and continuous conveying power, enabling the conveyed material to pass through the lifting platform more quickly, thereby improving the overall conveying efficiency. The rotation of the rollers reduces friction and impact between the conveyed material and the lifting platform. When the conveyed material is smoothly rolled and conveyed, the risk of damage to its surface and internal structure is greatly reduced, which is especially important for materials that require protection of surface quality or internal structure. When the lifting platform is flush with the conveying track, the second drive rotates the rollers, which can effectively achieve smooth movement of the conveyed material, reducing problems such as jamming and bumping caused by height differences or unevenness, and improving the stability and reliability of the entire conveying system.

[0023] Furthermore, a third sensor is installed in the middle of the aforementioned lifting platform. The third sensor is used to collect the conveyed object located in the middle of the lifting platform and then send a third control signal.

[0024] The second driver is connected to the third sensor and is used to receive and execute the third control signal.

[0025] Furthermore, the second driver is connected to the first sensor and the second sensor, and the second driver is used to receive and execute the first control signal or the second control signal.

[0026] The addition of the third sensor enables the conveying device to monitor the status of the conveyed items in the middle of the lifting platform in real time. Once an item enters the area, the sensor can immediately detect it and send a control signal to the second drive. This real-time monitoring and response mechanism helps to quickly adjust the conveying process to adapt to different production needs and logistics environments.

[0027] Furthermore, the side wall of the aforementioned lifting platform is provided with a guide block, and a guide rod is vertically arranged inside the aforementioned housing. The guide block is adapted to the guide rod, and when the first driver drives the lifting platform to rise and fall, the guide block moves along the guide rod.

[0028] The cooperation between the guide block and the guide rod restricts the horizontal displacement and swaying of the lifting platform during the lifting process. When the first driver drives the lifting platform to lift, the guide block moves along the guide rod to ensure that the lifting platform lifts and lowers according to the predetermined trajectory, thereby avoiding unstable conveying or safety hazards caused by deviation or swaying.

[0029] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0030] This conveyor system employs a double-layer structure design with upper and lower conveyor tracks, improving space utilization and allowing more materials or products to be carried within the same floor area. This enhances conveying capacity and flexibility without increasing the footprint. The double-layer structure also allows for independent or collaborative conveying operations between different levels, providing more possibilities for complex logistics needs. Lifting mechanisms are installed at both ends of the conveyor, enabling linkage between the upper and lower conveyor tracks. This allows materials or products to be transferred between the two levels as needed, without manual intervention or complex conversion equipment. This automated lifting and conversion greatly improves the flexibility of the conveying process, enabling rapid response to changing needs in production or logistics. Due to the double-layer conveyor tracks and lifting mechanisms, this system can provide multiple material conveying paths. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0032] Figure 1 This is a schematic diagram of the overall structure;

[0033] Figure 2 This is a schematic diagram of the external structure of the lifting mechanism;

[0034] Figure 3 This is a schematic diagram of the internal structure of the lifting mechanism.

[0035] The attached diagram shows the markings and corresponding component names:

[0036] 10. Conveying mechanism; 11. Upper conveying track; 12. Lower conveying track; 20. Lifting mechanism; 21. Housing; 22. Lifting platform; 23. First driver; 24. Roller; 25. Platform; 26. Second driver; 27. Guide block; 28. Guide rod; 31. First sensor; 32. Second sensor; 33. Third sensor. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0038] Example 1

[0039] This embodiment 1 provides a circulating conveying device, including a conveying mechanism 10 and a lifting mechanism 20, wherein the conveying mechanism 10 is provided with a lifting mechanism 20 at both ends;

[0040] The aforementioned conveying mechanism 10 includes an upper conveying track 11 and a lower conveying track 12, which are linked together by a lifting mechanism 20. The conveying tracks can be existing belt conveyors, conveyor chains, etc.

[0041] The conveying device adopts a double-layer structure design with an upper conveying track 11 and a lower conveying track 12, which improves space utilization and allows more materials or products to be carried in the same area, thereby enhancing the conveying capacity and flexibility without increasing the floor space. The double-layer structure also allows for independent or collaborative conveying operations between different levels, providing more possibilities for complex logistics needs. Lifting mechanisms 20 are set at both ends of the conveying mechanism 10, and the linkage between the upper conveying track 11 and the lower conveying track 12 is realized through the lifting mechanisms 20, allowing materials or products to be transferred between the upper and lower layers as needed without manual intervention or complex conversion equipment.

[0042] One application scenario for reference is that when processing materials, some processes need to be repeated. Since the processes repeated in the initial and cyclic processes are different, some of the repetitive processes are set on the upper conveyor track 11, and others are set on the lower conveyor track 12. If the initial process starts from the upper conveyor track 11, after the process is completed on the upper conveyor track 11, it enters the lower conveyor track 12 through the lifting mechanism 20 to complete other processes, and then returns to the upper conveyor track 11 through the lifting mechanism 20 to complete the repetitive processes. This process is repeated until all repetitive processes are completed. This flexible path selection capability allows the conveying device to adapt to more diverse production processes and logistics needs, improving the flexibility and adaptability of the overall system.

[0043] Example 2

[0044] Based on Embodiment 1, the lifting mechanism 20 includes a housing 21, a first driver 23, and a lifting platform 22, which are disposed within the housing 21. The first driver 23 can be a hydraulic cylinder or a lead screw motor. When the first driver 23 is a hydraulic cylinder, it extends out of the housing 21, allowing the output shaft to have a stroke extending from the lower conveying track 12 to the upper conveying track 11, thus playing a telescopic role. When the first driver 23 is a lead screw motor, a limiting rod is provided next to the lead screw of the lead screw motor. The limiting rod is connected to the housing 21, and the lifting platform 22 is provided with not only a threaded hole adapted to the lead screw but also a through hole adapted to the limiting rod, thereby driving the lifting platform 22 to rise and fall.

[0045] The output shaft of the first driver 23 is connected to the lifting platform 22; the lifting platform 22 is used to carry the conveyed object; the first driver 23 is used to drive the lifting platform 22 to move up and down.

[0046] The aforementioned lifting platform 22 includes a frame 25 and a plurality of rollers 24. The rollers 24 are evenly arranged on the frame 25, which supports the rollers 24. The upper surface of the rollers 24 is used to contact the conveyed object.

[0047] The aforementioned lifting mechanism 20 is integrated within the housing 21, which provides protection for the internal mechanical components, preventing interference and damage from the external environment and improving the reliability and durability of the equipment.

[0048] The rollers 24 are mounted on the frame 25, with their upper surfaces used to contact and support the conveyed material. Compared to the traditional flat lifting platform 22, the rollers 24 have lower frictional resistance and higher rolling efficiency, meaning that less driving force is required when the conveyed material moves on the lifting platform 22, and the movement is smoother and more stable. The rolling characteristics of the rollers 24 also make it easier to position and adjust the conveyed material on the lifting platform 22, allowing for easy pushing or adjusting of the conveyed material's position to adapt to different conveying needs or processing flows. The rolling characteristics of the rollers 24 reduce the moving resistance of the conveyed material on the lifting platform 22, thereby improving conveying efficiency and enabling the conveying device to process more materials or products faster, meeting the fast-paced needs of production lines or logistics systems.

[0049] Example 3

[0050] Based on Embodiment 2, when the lifting platform 22 is flush with the upper conveying track 11 in the horizontal direction, the upper surface of the roller 24 is smoothly connected to the upper surface of the upper conveying track 11.

[0051] When the aforementioned lifting platform 22 is flush with the lower conveying track 12, the upper surface of the aforementioned roller 24 is smoothly connected to the upper surface of the lower conveying track 12.

[0052] When the aforementioned lifting platform 22 is flush with the upper or lower conveying track 12, the upper surface of the roller 24 smoothly connects with the upper surface of the conveying track. This means that materials or products can smoothly transition from the lifting platform 22 to the conveying track or vice versa, avoiding problems such as jamming, bumping, or falling caused by height differences or unevenness. The smooth connection also reduces the impact and vibration on materials or products during the transfer process, helping to protect their surface integrity and internal quality, which is especially important for fragile or sensitive products. The smooth connection ensures the continuous flow of materials or products during the conveying process, reducing the time wasted due to waiting, adjustment, or repositioning. This continuity improves conveying efficiency, enabling the entire production line or logistics system to process more materials or products faster.

[0053] Example 4

[0054] Based on embodiment 3, a first sensor 31 and a second sensor 32 (the first sensor 31 and the second sensor 32 can be photoelectric sensors) are provided on the side plate of the housing 21. The first sensor 31 is located above the upper conveying track 11, and the second sensor 32 is located above the lower conveying track 12.

[0055] The first sensor 31 is used to collect the conveyed object on the lifting platform 22 when the lifting platform 22 is at the height of the upper conveying track 11, and then send a first control signal.

[0056] The first sensor 31 is used to collect the conveyed object on the lifting platform 22 when the lifting platform 22 is at the height of the lower conveying rail 12, and then send a second control signal.

[0057] The first driver 23 is connected to the first sensor 31 and the second sensor 32. The first driver 23 is used to receive and execute the first control signal or the second control signal.

[0058] The first sensor 31 is positioned above the upper conveyor track 11. Its main function is to detect whether there is a conveyed object on the lifting platform 22 when the lifting platform 22 is at the height of the upper conveyor track 11. Once a conveyed object is detected, the first sensor 31 sends a first control signal to the first driver 23 to execute corresponding operations (such as stopping lifting or starting conveying). The second sensor 32 is positioned above the lower conveyor track 12. Its function is to detect whether there is a conveyed object on the lifting platform 22 when the lifting platform 22 is at the height of the lower conveyor track 12. When a conveyed object is detected, the second sensor 32 sends a second control signal to the first driver 23 to trigger different operations (such as adjusting the lifting height). (Speed, change of conveying path, etc.); By monitoring the status of the conveyed object on the lifting platform 22 in real time, the sensor can quickly send control signals to the first driver 23, so that the conveying device can respond immediately and adjust its working status. This real-time monitoring and response mechanism greatly enhances the flexibility and reaction speed of the conveying device. The first driver 23, as an actuator, is connected to and receives control signals from the first sensor 31 and the second sensor 32. By executing the operation indicated by the control signal, the first driver 23 ensures that the conveying device can work according to the predetermined program or real-time requirements. This integrated function enables the various parts of the conveying device to work together to achieve efficient and flexible conveying tasks.

[0059] In one possible application scenario, the conveyed object is transported from the upper conveyor track 11 to the lower conveyor track 12 via a lifting mechanism 20 (defined as lifting mechanism 20-1), and then from the lower conveyor track 12 to the upper conveyor track 11 via another lifting mechanism 20 (defined as lifting mechanism 20-2). The initial position of the lifting platform 22 of lifting mechanism 20-1 is flush with the upper conveyor track 11, and the initial position of the lifting platform 22 of lifting mechanism 20-2 is flush with the lower conveyor track 12.

[0060] The descent operation is carried out in the lifting mechanism 20. The specific steps are as follows: the conveyed object is gradually moved from the upper conveying track 11 to the lifting platform 22. When the first sensor 31 detects the conveyed object, it sends the first control signal to the first driver 23. The first driver 23 drives the lifting platform 22 to move downward. When the second sensor 32 detects the conveyed object, it sends the second control signal to the first driver 23. The first driver 23 stops, and the descent operation is completed.

[0061] The lifting mechanism 20 performs an upward operation. The specific steps are as follows: the conveyed object gradually moves from the lower conveying track 12 to the lifting platform 22. When the second sensor 32 detects the conveyed object, it sends a second control signal to the first driver 23. The first driver 23 drives the lifting platform 22 to move upward. When the first sensor 31 detects the conveyed object, it sends a first control signal to the first driver 23. The first driver 23 stops, completing the upward operation.

[0062] Example 5

[0063] Based on embodiment 4, the lifting platform 22 further includes a second driver 26 (which may be a stepper motor), the output shaft of which is connected to the roller 24; the second driver 26 is used to drive the roller 24 to rotate.

[0064] A third sensor 33 (which may be a photoelectric sensor) is provided in the middle of the aforementioned lifting platform 22. The third sensor 33 is used to collect the conveyed object located in the middle of the lifting platform 22 and then send a third control signal.

[0065] The second driver 26 is connected to the first sensor 31, the second sensor 32 and the third sensor 33. The second driver 26 is used to receive and execute the first control signal, the second control signal and the third control signal.

[0066] When the second drive 26 drives the roller 24 to rotate, the movement of the conveyed material on the lifting platform 22 will no longer rely entirely on external thrust or gravity. The active rotation of the roller 24 can provide more stable and continuous conveying power, enabling the conveyed material to pass through the lifting platform 22 more quickly, thereby improving the overall conveying efficiency. The rotation of the roller 24 reduces the friction and impact between the conveyed material and the lifting platform 22. When the conveyed material is smoothly rolled and conveyed, the risk of damage to its surface and internal structure is greatly reduced, which is especially important for materials that need to protect their surface quality or internal structure. When the lifting platform 22 is flush with the conveying track, the second drive 26 drives the roller 24 to rotate, which can effectively realize the smooth movement of the conveyed material, reduce problems such as jamming and bumping caused by height differences or unevenness, and improve the stability and reliability of the entire conveying system.

[0067] In one possible application scenario, during the descent operation of the lifting mechanism 20, the conveyed object gradually moves from the upper conveyor track 11 to the lifting platform 22. When the third sensor 33 detects the conveyed object in the middle of the lifting platform 22, it sends a third control signal to the second driver 26, stopping the second driver 26 and stopping the roller 24, thus stopping the conveyed object in the middle of the lifting platform 22. As the lifting platform 22 moves downward, when the second sensor 32 detects the conveyed object on the lifting platform 22, it sends a second control signal to the second driver 26, activating the second driver 26, causing the roller 24 to rotate again and convey the object to the lower conveyor track. The conveyor is moved from the lower conveyor track 12 to the lifting platform 22. When the third sensor 33 detects the conveyed object in the middle of the lifting platform 22, it sends a third control signal to the second driver 26, stops the second driver 26, and the roller 24 stops rotating, so that the conveyed object stops in the middle of the lifting platform 22. The lifting platform 22 moves upward. When the first sensor 31 detects the conveyed object in the lifting platform 22, it sends a first control signal to the second driver 26, starts the second driver 26, and the roller 24 rotates again, conveying the conveyed object to the upper conveyor track 11.

[0068] Example 6

[0069] Based on Embodiment 2, the side wall of the lifting platform 22 is provided with a guide block 27, and a guide rod 28 is vertically provided inside the housing 21. The guide block 27 is adapted to the guide rod 28. When the first driver 23 drives the lifting platform 22 to rise and fall, the guide block 27 moves along the guide rod 28.

[0070] The cooperation between the guide block 27 and the guide rod 28 restricts the horizontal displacement and swaying of the lifting platform 22 during the lifting process. When the first driver 23 drives the lifting platform 22 to lift, the guide block 27 moves along the guide rod 28 to ensure that the lifting platform 22 lifts and lowers according to the predetermined trajectory, thereby avoiding unstable conveying or safety hazards caused by deviation or swaying.

[0071] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A circulating conveying device, characterized in that, It includes a conveying mechanism (10), and lifting mechanisms (20) are respectively provided at both ends of the conveying mechanism (10); The conveying mechanism (10) includes an upper conveying track (11) and a lower conveying track (12), which are linked by a lifting mechanism (20); The lifting mechanism (20) includes a housing (21), a first driver (23), and a lifting platform (22), wherein the first driver (23) and the lifting platform (22) are disposed inside the housing (21); The output shaft of the first driver (23) is connected to the lifting platform (22); the lifting platform (22) is used to carry the conveyed object; the first driver (23) is used to drive the lifting platform (22) to rise and fall.

2. The circulating conveying device according to claim 1, characterized in that, The lifting platform (22) includes a frame (25) and rollers (24), the rollers (24) are mounted on the frame (25), and the upper surface of the rollers (24) is used to contact the conveyed object.

3. The circulating conveying device according to claim 2, characterized in that, In the horizontal direction, when the lifting platform (22) is flush with the upper conveying track (11), the upper surface of the roller (24) is smoothly connected to the upper surface of the upper conveying track (11); When the lifting platform (22) is flush with the lower conveying track (12), the upper surface of the roller (24) is smoothly connected to the upper surface of the lower conveying track (12).

4. A circulating conveying device according to claim 3, characterized in that, A first sensor (31) and a second sensor (32) are provided on the side plate of the housing (21). The first sensor (31) is located above the upper conveying track (11), and the second sensor (32) is located above the lower conveying track (12). The first sensor (31) is used to collect the conveyed object on the lifting platform (22) when the lifting platform (22) is flush with the upper conveying track (11) and then send a first control signal. The first sensor (31) is used to collect the conveyed object on the lifting platform (22) when the lifting platform (22) is flush with the lower conveying track (12) and then send a second control signal. The first driver (23) is connected to the first sensor (31) and the second sensor (32), and the first driver (23) is used to receive and execute the first control signal or the second control signal.

5. A circulating conveying device according to claim 2, characterized in that, The lifting platform (22) also includes a second driver (26), the output shaft of which is connected to the roller (24); the second driver (26) is used to drive the roller (24) to rotate.

6. A circulating conveying device according to claim 5, characterized in that, A third sensor (33) is provided in the middle of the lifting platform (22). The third sensor (33) is used to collect the conveyed object located in the middle of the lifting platform (22) and send a third control signal. The second driver (26) is connected to the third sensor (33), and the second driver (26) is used to receive and execute the third control signal.

7. A circulating conveying device according to claim 6, characterized in that, The second driver (26) is connected to the first sensor (31) and the second sensor (32), and the second driver (26) is used to receive and execute the first control signal or the second control signal.

8. A circulating conveying device according to claim 1, characterized in that, The side wall of the lifting platform (22) is provided with a guide block (27), and a guide rod (28) is vertically arranged inside the housing (21). The guide block (27) is adapted to the guide rod (28). When the first driver (23) drives the lifting platform (22) to rise and fall, the guide block (27) moves along the guide rod (28).

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