Multi-layer platform transferring and conveying device
By designing a multi-layer platform transfer and transportation device, the combination of rotating components, lifting components and telescopic components is used to solve the stability and reliability problems of robots in large-scale and heavy-duty handling, and achieve efficient, stable and flexible logistics processing.
Patent Information
- Application Number
- CN202421997146.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The robot has stability and reliability problems when handling large-scale and heavy objects. The complex structure leads to high manufacturing and maintenance costs, and its flexibility is difficult to adjust to suit different storage environments.
A multi-layer platform transfer and transportation device is designed, using a combination of rotating components, lifting components and telescopic components. Through multi-stage telescopic plates and synchronous movement technology, efficient automatic telescopic operations are achieved, multiple grasping and release actions are reduced, and the operation process is simplified.
The device is able to handle heavy objects and large-scale pallets stably, improve operational efficiency and stability, reduce manufacturing and maintenance costs, reduce error rates, and adapt to warehousing needs of different heights and angles.
Smart Images

Figure CN222906563U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of transfer devices, and in particular to a multi-layer platform transfer and conveying device. Background Art
[0002] In modern warehousing and logistics management, the application of automated equipment is becoming increasingly popular, especially in the process of handling and storing heavy and large-scale objects. As a common automated equipment, robotic arms have been widely used in various warehousing operations. Robotic arms usually achieve the grasping, handling, and placement of objects through joints and end effectors with multiple degrees of freedom, and have a certain degree of flexibility and precision.
[0003] However, robotic arms show certain limitations when handling large-scale and heavy object handling. Due to the limited load-bearing capacity of robotic arms, when handling trays or objects with a relatively large weight, the stability and reliability of robotic arms may be affected, and they cannot meet the high-intensity operation requirements. At the same time, robotic arms need to perform multiple grasping and releasing actions during the handling process, which not only increases the operation time but also increases the possibility of errors.
[0004] Moreover, the structure of robotic arms is complex, including multiple moving parts and precision sensors, and the manufacturing and maintenance costs are relatively high. The complex structure also means a higher failure rate and longer repair time, which affect the continuity and efficiency of warehousing operations.
[0005] In addition, although the flexibility of robotic arms is relatively high, it is difficult to adjust and optimize them in the face of specific warehousing environments and requirements. For example, in a warehousing room with limited height or narrow space, the operation range and efficiency of robotic arms may be restricted, and their advantages cannot be fully utilized. Summary of the Utility Model
[0006] In order to efficiently handle large-scale and heavy object handling in a warehousing room with limited space, reduce processes, and improve efficiency, this application provides a multi-layer platform transfer and conveying device.
[0007] The multi-layer platform transfer and conveying device provided by this application adopts the following technical solutions:
[0008] A multi-layer platform transfer and conveying device, comprising a turntable and a rotating assembly, the turntable is arranged on the rotating assembly, the rotating assembly drives the turntable to rotate, a lifting assembly is installed on the turntable, the lifting assembly is connected with a support plate, the support plate is slidably connected with a first telescopic plate, the first telescopic plate is slidably connected with a second telescopic plate, and so on, the (N - 1)th telescopic plate is slidably connected with the Nth telescopic plate, the Nth telescopic plate is slidably connected with a supporting seat, the support plate, the first telescopic plate to the Nth telescopic plate are jointly connected with a telescopic assembly, and the telescopic assembly is used to drive the first telescopic plate to extend out of the support plate, the Nth telescopic plate to extend out of the (N - 1)th telescopic plate, and the supporting seat to extend out of the Nth telescopic plate.
[0009] By adopting the above technical solution, the rotating assembly drives the turntable to rotate, so that the lifting assembly drives the support plate to rotate, thereby driving the supporting seat to rotate towards the goods. Then the lifting assembly drives the supporting seat to descend to a position lower than the goods. Next, the telescopic assembly controls the first telescopic plate to the Nth telescopic plate and the supporting seat to move towards the goods, so that the supporting seat is located below the goods. Then the lifting assembly controls the supporting seat to move upward to lift the goods. Finally, through the cooperation of the lifting assembly, the rotating assembly and the telescopic assembly, the goods are transported to the designated position.
[0010] By adopting the technical solution of multi-stage telescopic plates and synchronous movement, not only the efficient automatic telescopic operation is realized, making the entire telescopic system occupy less space when not extended, but it can extend a longer operating distance when needed, thus improving the space utilization rate. And it reduces the actions of grasping and releasing multiple times, simplifies the operation process, and reduces the error rate.
[0011] Through the cooperation of the rotating assembly, the lifting assembly and the telescopic assembly, the conveying device can stably handle heavy objects and large-scale pallets, improve the operation efficiency and stability, while reducing complex moving parts and sensors, lowering the manufacturing and maintenance costs, and improving the reliability of the equipment.
[0012] Optionally, the telescopic assembly includes a first rotating shaft to an (N + 1)th rotating shaft, a first driving rack to an (N + 1)th driving rack, and a first auxiliary rack to an Nth auxiliary rack;
[0013] The first rotating shaft is rotatably connected with the support plate, the second rotating shaft is rotatably connected with the first telescopic plate, and the (N + 1)th rotating shaft is rotatably connected with the Nth telescopic plate;
[0014] The first driving rack is installed at the bottom of the first telescopic plate, the second driving rack is installed at the bottom of the second telescopic plate, and the (N + 1)th driving rack is installed at the bottom of the supporting seat;
[0015] The first auxiliary rack is installed on the top of the support plate, the second auxiliary rack is installed on the top of the first telescopic plate, and the Nth auxiliary rack is installed on the top of the (N - 1)th telescopic plate;
[0016] The support plate is connected with a first motor, the first motor is connected with the first rotating shaft, the first rotating shaft is connected with a first driving gear, the first driving gear meshes with the first driving rack, the second rotating shaft is connected with a second driving gear, the second driving gear meshes with the second driving rack, the (N + 1)th rotating shaft is connected with the (N + 1)th driving gear, and the (N + 1)th driving gear meshes with the (N + 1)th driving rack;
[0017] The second rotating shaft is connected with a first auxiliary gear, the first auxiliary gear meshes with the first auxiliary rack, the third rotating shaft is connected with a second auxiliary gear, the second auxiliary gear meshes with the second auxiliary rack, the (N + 1)th rotating shaft is connected with the Nth auxiliary gear, and the Nth auxiliary gear meshes with the Nth auxiliary rack.
[0018] By adopting the above technical solution, the first motor drives the first rotating shaft to rotate, the first rotating shaft drives the first driving gear to rotate, the first driving gear drives the first driving rack to move so that the first telescopic plate moves, the first telescopic plate drives the second rotating shaft to move, and the first auxiliary rack drives the first auxiliary gear to rotate, so that the second rotating shaft rotates while moving, and further the second driving gear rotates, and the second driving gear drives the second driving rack to move, so that the second telescopic plate moves;
[0019] And so on, the Nth telescopic plate drives the (N + 1)th rotating shaft to move, and the Nth auxiliary rack drives the Nth auxiliary gear to rotate, so that the (N + 1)th rotating shaft rotates while moving, and further the (N + 1)th driving gear rotates, and the (N + 1)th driving gear drives the (N + 1)th driving rack to move, so that the supporting seat moves. Thus, only one first motor needs to be designed to drive the multi-stage telescopic plates and the supporting seat to perform telescopic movement, and different numbers of stages of telescopic plates can be designed according to actual application situations.
[0020] Optionally, the rotating assembly includes a support platform, the support platform is rotatably connected with the turntable, the lifting assembly is arranged on the turntable, a second motor is arranged on the turntable, a driving shaft of the second motor is connected with a first gear, and a second gear is fixedly arranged in the support platform, and the first gear meshes with the second gear.
[0021] By adopting the above technical solution, the second motor drives the first gear to rotate, and the meshing action between the first gear and the second gear enables the turntable to rotate on the support platform.
[0022] Optionally, two second motors are provided, and the two second motors are symmetrically arranged about the axis of the turntable. Both of the first gears are meshed with the second gear.
[0023] By adopting the above technical solution, the coordinated control of the dual motors can effectively eliminate the clearance in gear meshing, improve the positioning accuracy of the turntable, and enable the system to operate in occasions with high-precision requirements. Through the combined action of the two motors, an even driving force is provided to ensure the smoothness of the turntable during rotation and reduce the vibration and instability caused by unilateral force.
[0024] Optionally, a bearing is arranged in the support platform. Both the first gear and the second gear are located within the bearing ring. The inner ring of the bearing is connected to the turntable, and the outer ring of the bearing is fixed within the support platform.
[0025] Optionally, the lifting assembly includes two support columns. Both of the support columns are arranged on the turntable. A lifting plate is slidably connected to each of the two support columns. The two lifting plates are jointly connected to the support plate. A lead screw is rotatably connected to the support column. A third motor is installed on the support column. The third motor is connected to the lead screw. A nut seat is threadedly connected to the lead screw. The nut seat is connected to the lifting plate on its same side.
[0026] By adopting the above technical solution, the third motor drives the lead screw to rotate, and the nut seat moves up and down along the lead screw, thereby driving the lifting plate to slide up and down. The two third motors respectively drive the two lead screws, which can evenly share the load, increase the overall load-bearing capacity of the system, and are suitable for heavier workpieces or trays. The two lead screws operate simultaneously to ensure that the lifting platform remains horizontal during lifting and prevent tilting or instability caused by a single lead screw drive.
[0027] Optionally, the supporting seat includes a connecting plate and two supporting rods. The two supporting rods are fixed to the connecting plate.
[0028] In summary, the present application includes at least one of the following beneficial technical effects:
[0029] 1. The design of this conveying device is simple, reducing complex moving parts and sensors, lowering the manufacturing and maintenance costs, and improving the reliability of the equipment;
[0030] 2. Through the cooperation of the lifting assembly and the telescopic assembly, this conveying device can stably handle heavy objects and large-scale trays, improving the operation efficiency and stability;
[0031] 3. It can achieve continuous handling and storage of trays, reducing the actions of multiple grasping and releasing, simplifying the operation process, and lowering the error rate;
[0032] 4. It can store pallets on storage support frames at different heights and angles, making full use of the space in the storage room and meeting various storage requirements;
[0033] 5. By adopting the technical solutions of multi-stage telescopic plates and synchronous movement, not only can efficient automatic telescopic operation be achieved, making the entire telescopic system occupy less space when not extended, but it can extend a longer operating distance when needed, thus improving space utilization. Brief Description of the Drawings
[0034] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present application.
[0035] Figure 2 It is a schematic diagram of the structure for embodying the rotating assembly in Embodiment 1 of the present application.
[0036] Figure 3 It is a schematic diagram of the structure for embodying the telescopic assembly in Embodiment 1 of the present application.
[0037] Figure 4 It is a schematic diagram of the structure for embodying the telescopic assembly in Embodiment 2 of the present application.
[0038] Description of the Reference Numerals: 1, turntable; 2, rotating assembly; 21, support platform; 22, bearing; 23, first gear; 24, second gear; 25, second motor; 3, lifting assembly; 31, support column; 32, lifting plate; 33, lead screw; 34, nut seat; 35, third motor; 4, support plate; 41, first telescopic plate; 42, second telescopic plate; 5, supporting seat; 51, connecting plate; 52, supporting rod; 6, telescopic assembly; 61, first rotating shaft; 62, second rotating shaft; 63, first driving rack; 64, second driving rack; 65, first auxiliary rack; 66, first motor; 67, first driving gear; 68, second driving gear; 69, first auxiliary gear; 610, third rotating shaft; 611, third driving rack; 612, second auxiliary rack; 613, third driving gear; 614, second auxiliary gear. Detailed Description of the Embodiments
[0039] The following will further elaborate on the present application in conjunction with the attached Figures 1-4 drawings.
[0040] Embodiment 1
[0041] Embodiment 1 of the present application discloses a multi-layer platform transfer and conveying device.
[0042] As Figure 1 , Figure 2 and Figure 3, the multi-layer platform transfer and conveying device includes a turntable 1 and a rotating assembly 2. The turntable 1 is arranged on the rotating assembly 2. The rotating assembly 2 includes a support platform 21. The support platform 21 is a cylindrical platform. The central axis of the support platform 21 coincides with the central symmetry line of the prism-shaped cavity. A bearing 22 is installed inside the support platform 21. The bearing 22 is concentric with the support platform 21, and the outer ring of the bearing 22 is fixed to the support platform 21. A second gear 24 is also fixed inside the support platform 21. The second gear 24 is located inside the inner ring of the bearing 22 and is concentric with it. The inner ring of the bearing 22 is bolted to the turntable 1. The turntable 1 is slidably arranged with the support platform 21. Two second motors 25 are installed on the turntable 1. The drive shafts of the two second motors 25 both pass through the turntable 1 and are fixed with first gears 23. The two first motors 66 are symmetrically arranged with respect to the central axis of the turntable 1. The two first gears 23 are both meshed with the second gear 24;
[0043] A lifting assembly 3 is installed on the turntable 1. The lifting assembly 3 includes two support columns 31. The two support columns 31 are installed on the turntable 1. The two support columns 31 are symmetrically arranged with respect to the central axis of the turntable 1. A lifting plate 32 is slidably connected to the support columns 31. A lead screw 33 is rotatably connected inside the support columns 31. The lead screw 33 is arranged along the height direction of the support columns 31. A nut seat 34 is bolted to the lifting plate 32. The nut seat 34 is threadedly connected to the lead screw 33. A third motor 35 is installed on the support columns 31. The third motor 35 is connected to the lead screw 33;
[0044] Two lifting plates 32 are jointly connected to a support plate 4. The support plate 4 is slidably connected to a first telescopic plate 41. The first telescopic plate 41 is slidably connected to a supporting seat 5. The support plate 4, the first telescopic plate 41 and the supporting seat 5 are jointly connected to a telescopic assembly 6;
[0045] The telescopic assembly 6 includes a first rotating shaft 61 to an N + 1 rotating shaft, a first driving rack 63 to an N + 1 driving rack, a first auxiliary rack 65 to an N auxiliary rack; in the embodiment of the present application, N is taken as 1, and the specific structure is as follows:
[0046] The first rotating shaft 61 is rotatably connected to the support plate 4, and the second rotating shaft 62 is rotatably connected to the first telescopic plate 41;
[0047] The first driving rack 63 is installed at the bottom of the first telescopic plate 41, and the second driving rack 64 is installed at the bottom of the supporting seat 5;
[0048] The first auxiliary rack 65 is installed at the top of the support plate 4;
[0049] The support plate 4 is connected with a first motor 66. The first motor 66 is connected to the first rotating shaft 61. The first rotating shaft 61 is connected with a first driving gear 67. The first driving gear 67 is meshed with the first driving rack 63. The second rotating shaft 62 is connected with a second driving gear 68. The second driving gear 68 is meshed with the second driving rack 64;
[0050] The second rotating shaft 62 is connected with a first auxiliary gear 69, and the first auxiliary gear 69 meshes with the first auxiliary rack 65.
[0051] The supporting seat 5 includes a connecting plate 51 and two supporting rods 52. The two supporting rods 52 are fixed to the connecting plate 51, and the second driving rack 64 is installed at the bottom of the connecting plate 51.
[0052] The implementation principle of the embodiment of the present application is as follows: The second motor 25 drives the first gear 23 to rotate. The meshing of the first gear 23 and the second gear 24 enables the turntable 1 to rotate on the support table 21, causing the support column 31 and the lifting plate 32 to rotate and then driving the support plate 4 to rotate, thereby driving the supporting rod 52 to rotate towards the goods. Then, the third motor 35 drives the lead screw 33 to rotate, and the nut seat 34 moves up and down along the lead screw 33, thereby driving the lifting plate 32 to slide up and down to lower the supporting rod 52 below the goods. Next, the first motor 66 drives the first rotating shaft 61 to rotate, the first rotating shaft 61 drives the first driving gear 67 to rotate, the first driving gear 67 drives the first driving rack 63 to move to make the first telescopic plate 41 move, the first telescopic plate 41 drives the second rotating shaft 62 to move, causing the first auxiliary rack 65 to drive the first auxiliary gear 69 to rotate, so that the second rotating shaft 62 rotates while moving, and further causing the second driving gear 68 to rotate. The second driving gear 68 drives the second driving rack 64 to move, making the supporting rod 52 move below the goods. Then, the third motor 35 starts to control the supporting rod 52 to move upward to lift the goods. Finally, with the cooperation of the lifting assembly 3, the rotating assembly 2, and the telescopic assembly 6, the goods are transported to the designated position.
[0053] By adopting the technical solution of multi-stage telescopic plates and synchronous movement, not only the efficient automatic telescopic operation is realized, making the entire telescopic system occupy less space when not extended, but it can extend a longer operating distance when needed, thereby improving the space utilization rate. And it reduces the actions of multiple grasping and releasing, simplifies the operation process, and reduces the error rate.
[0054] Through the cooperation of the rotating assembly 2, the lifting assembly 3, and the telescopic assembly 6, the conveying device can stably handle heavy objects and large-scale pallets, improving the operation efficiency and stability. At the same time, it reduces complex moving parts and sensors, lowers the manufacturing and maintenance costs, and improves the reliability of the equipment.
[0055] Embodiment 2
[0056] Referring to Figure 4 , the difference between this embodiment and Embodiment 1 is that in the embodiment of the present application, N is taken as 2, and the specific structure is as follows:
[0057] A second telescopic plate 42 is slidably connected to the first telescopic plate 41, and the connecting plate 51 is slidably connected to the second telescopic plate 42;
[0058] The first rotating shaft 61 is rotatably connected to the support plate 4, the second rotating shaft 62 is rotatably connected to the first telescopic plate 41, and the third rotating shaft 610 is rotatably connected to the second telescopic plate 42;
[0059] The first driving rack 63 is installed at the bottom of the first telescopic plate 41, the second driving rack 64 is installed at the bottom of the second telescopic plate 42, and the third driving rack 611 is installed at the bottom of the supporting seat 5;
[0060] The first auxiliary rack 65 is installed at the top of the support plate 4, and the second auxiliary rack 612 is installed at the top of the first telescopic plate 41;
[0061] The first motor 66 is connected to the first rotating shaft 61, the first rotating shaft 61 is connected to the first driving gear 67, the first driving gear 67 meshes with the first driving rack 63, the second rotating shaft 62 is connected to the second driving gear 68, the second driving gear 68 meshes with the second driving rack 64, the third rotating shaft 610 is connected to a third driving gear 613, and the third driving gear 613 meshes with the third driving rack 611;
[0062] The second rotating shaft 62 is connected to the first auxiliary gear 69, the first auxiliary gear 69 meshes with the first auxiliary rack 65, the third rotating shaft 610 is connected to a second auxiliary gear 614, and the second auxiliary gear 614 meshes with the second auxiliary rack 612.
[0063] The first motor 66 drives the first rotating shaft 61 to rotate, the first rotating shaft 61 drives the first driving gear 67 to rotate, the first driving gear 67 drives the first driving rack 63 to move so that the first telescopic plate 41 moves, the first telescopic plate 41 drives the second rotating shaft 62 to move so that the first auxiliary rack 65 drives the first auxiliary gear 69 to rotate, so that the second rotating shaft 62 rotates while moving, and further the second driving gear 68 rotates, the second driving gear 68 drives the second driving rack 64 to move, and the second telescopic plate 42 moves;
[0064] The second telescopic plate 42 drives the third rotating shaft 610 to move so that the second auxiliary rack 612 drives the second auxiliary gear 614 to rotate, so that the third rotating shaft 610 rotates while moving, and further the third driving gear 613 rotates, the third driving gear 613 drives the third driving rack 611 to move, and the connecting plate 51 moves.
[0065] In other embodiments, the telescopic assembly 6 can also be multiple cylinders, and the cylinders on the same-level telescopic plates push the next-level telescopic plates to move.
[0066] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. A multi-layer platform transfer and conveying device, characterized in that: The invention comprises a turntable (1) and a rotating assembly (2), wherein the turntable (1) is arranged on the rotating assembly (2), the rotating assembly (2) drives the turntable (1) to rotate, a lifting assembly (3) is installed on the turntable (1), the lifting assembly (3) is connected to a support plate (4), the support plate (4) is slidably connected to a first telescopic plate (41), the first telescopic plate (41) is slidably connected to a second telescopic plate (42), and so on, further comprising an N-1 telescopic plate, the N-1 telescopic plate is slidably connected to an N-th telescopic plate, the N-th telescopic plate is slidably connected to a supporting seat (5), the supporting plate (4), the first telescopic plate (41) to the N-th telescopic plate are commonly connected to a telescopic assembly (6), the telescopic assembly (6) is used to drive the first telescopic plate (41) to extend out of the support plate (4), the N-th telescopic plate to extend out of the N-1 telescopic plate, and the supporting seat (5) to extend out of the N-th telescopic plate.
2. The multi-layer platform transfer and conveying device according to claim 1, characterized in that: The telescopic assembly (6) comprises a first rotating shaft (61), a second rotating shaft (62), a third rotating shaft (610) to an N+1th rotating shaft, a first driving rack (63), a second driving rack (64) to an N+1th driving rack, a first auxiliary rack (65), and a second auxiliary rack (612) to an Nth auxiliary rack; The first rotating shaft (61) is rotationally connected to the support plate (4), the second rotating shaft (62) is rotationally connected to the first telescopic plate (41), and the N+1 rotating shaft is rotationally connected to the Nth telescopic plate; The first driving rack (63) is installed at the bottom of the first telescopic plate (41), the second driving rack (64) is installed at the bottom of the second telescopic plate (42), and the N+1 driving rack is installed at the bottom of the supporting seat (5); The first auxiliary rack (65) is installed on the top of the support plate (4), the second auxiliary rack (612) is installed on the top of the first telescopic plate (41), and the Nth auxiliary rack is installed on the top of the N-1th telescopic plate; The support plate (4) is connected to a first motor (66), the first motor (66) is connected to the first rotating shaft (61), the first rotating shaft (61) is connected to a first driving gear (67), the first driving gear (67) is meshed with the first driving rack (63), the second rotating shaft (62) is connected to a second driving gear (68), the second driving gear (68) is meshed with the second driving rack (64), the N+1 rotating shaft is connected to an N+1 driving gear, the N+1 driving gear is meshed with the N+1 driving rack; The second rotating shaft (62) is connected to a first auxiliary gear (69), and the first auxiliary gear (69) is meshed with the first auxiliary rack (65); the third rotating shaft (610) is connected to a second auxiliary gear (614), and the second auxiliary gear (614) is meshed with the second auxiliary rack (612); the N+1 rotating shaft is connected to an Nth auxiliary gear, and the Nth auxiliary gear is meshed with the Nth auxiliary rack.
3. The multi-layer platform transfer and conveying device according to claim 1, characterized in that: The rotating assembly (2) comprises a support platform (21), the support platform (21) is rotatably connected to the turntable (1), the lifting assembly (3) is arranged on the turntable (1), a second motor (25) is arranged on the turntable (1), a driving shaft of the second motor (25) is connected to a first gear (23), a second gear (24) is fixedly arranged inside the support platform (21), and the first gear (23) is meshed with the second gear (24).
4. The multi-layer platform transfer and conveying device according to claim 3 is characterized in that: Two second motors (25) are provided, and the two second motors (25) are symmetrically arranged about the central axis of the rotating disk (1), and the two first gears (23) are both meshed with the second gear (24).
5. The multi-layer platform transfer and conveying device according to claim 3 is characterized in that: A bearing (22) is arranged inside the support platform (21); the first gear (23) and the second gear (24) are both located inside the bearing (22) ring; the inner ring of the bearing (22) is connected to the turntable (1); and the outer ring of the bearing (22) is fixed inside the support platform (21).
6. The multi-layer platform transfer and conveying device according to claim 3, characterized in that: The lifting assembly (3) comprises two support columns (31), both of which are arranged on the turntable (1), and both of which are slidably connected to a lifting plate (32), and the two lifting plates (32) are commonly connected to the support plate (4), and the support columns (31) are rotatably connected to a lead screw (33), and a third motor (35) is installed on the support column (31), and the third motor (35) is connected to the lead screw (33), and the lead screw (33) is threadedly connected to a nut seat (34), and the nut seat (34) is connected to the lifting plate (32) on the same side thereof.
7. The multi-layer platform transfer and conveying device according to claim 1, characterized in that: The supporting seat (5) comprises a connecting plate (51) and two supporting rods (52), and the two supporting rods (52) are fixed to the connecting plate (51).