Overturning type photovoltaic car shed convenient to overhaul

Abstract

The invention relates to the technical field of photovoltaic car sheds, in particular to a turnover type photovoltaic car shed convenient to overhaul, which comprises a base, brackets, a cross beam, a first rotating plate, a second rotating plate, a placing frame, a photovoltaic panel and the like, the brackets are uniformly connected to the top of the base at intervals, and the cross beam is connected to the tops of the brackets; a first rotating plate is rotationally connected to every two adjacent supports, a second rotating plate is rotationally connected to the top of each first rotating plate, a placement frame is connected to the top of each second rotating plate, and a photovoltaic panel is placed in each placement frame. The first rotating plate can be pushed through the pushing block, the photovoltaic panel can be assisted to rotate rightwards, the photovoltaic panel can be driven to rotate downwards through extension of the telescopic rod of the hydraulic cylinder, the photovoltaic panel is turned over, the photovoltaic panel is made to be close to the ground, the risk of high-altitude operation is avoided, the photovoltaic panel is conveniently overhauled, the personal safety of maintainers is ensured, and the maintenance efficiency is improved. And the operation difficulty can be reduced, the maintenance time is shortened, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic carports, and in particular to a flip-type photovoltaic carport that is easy to maintain. Background Art

[0002] As the global demand for renewable energy continues to increase, solar energy has been widely used as a sustainable form of energy. Photovoltaic carports, as an innovative form of solar energy utilization, not only provide shade and protection for vehicles, but also convert solar energy into electrical energy through photovoltaic panels installed on the top of the carport, thereby achieving energy conservation and emission reduction.

[0003] Photovoltaic carports are usually composed of steel structure supports, photovoltaic panels, inverters and other components. Photovoltaic panels are installed on the top of the carport and generate direct current by absorbing sunlight, which is then converted into alternating current by the inverter for use or connected to the power grid. They utilize the space resources of the parking lot to provide green electricity for vehicles, which has significant economic and social benefits.

[0004] The photovoltaic panels are fixed at a higher position, and maintenance personnel need to climb to the top of the carport or use a ladder to operate during maintenance. High-altitude operations themselves are dangerous, especially in strong winds or bad weather, accidents are prone to occur, and the safety is not high. Due to the limited working space, maintenance personnel's operation is difficult and time-consuming, affecting the maintenance efficiency. Summary of the invention

[0005] In view of this, the present invention provides a flip-type photovoltaic carport that is easy to maintain, which can overcome the disadvantages that maintenance personnel need to climb to the top of the carport or use a ladder to operate during maintenance. High-altitude operations themselves have certain risks and are not safe. Due to the limited working space, maintenance personnel have difficulty in operation and it takes a long time, which affects the maintenance efficiency.

[0006] The technical solution is: a flip-type photovoltaic carport that is easy to repair, including a base, a bracket, a crossbeam, a first rotating plate, a second rotating plate, a placement frame, a photovoltaic panel, an electric rotating shaft, a winding wheel, an installation shaft, a fixed pulley, a wire rope, a connecting frame, a pushing mechanism, a rotating mechanism and a limiting mechanism. The top of the base is evenly connected with brackets, the top of the bracket is connected with a crossbeam, the two adjacent brackets are connected to the first rotating plate, the top of the first rotating plate is connected to the second rotating plate, the top of the second rotating plate is connected to the placement frame, and the placement Photovoltaic panels are placed in the frames, and an electric rotating shaft is installed on two adjacent brackets, and a winding wheel is connected to the electric rotating shaft. Two adjacent brackets are connected to a mounting shaft, and the mounting shaft is connected to a fixed pulley. A wire rope is wound around the winding wheel, and the wire rope passes around the fixed pulley. A connecting frame is connected to the first rotating plate, and the wire rope is connected to the connecting frame. The pushing mechanism is used to push the first rotating plate to assist the photovoltaic panel to rotate to the right, the rotating mechanism is used to control the photovoltaic panel to rotate downward, and the limiting mechanism is used to limit the photovoltaic panel in the placement frame.

[0007] As an improvement of the above solution, the pushing mechanism includes a nitrogen spring and a push block. The bracket is equipped with a nitrogen spring, and the nitrogen spring is connected to a push block through a universal ball. The right side of the push block contacts the left side of the first rotating plate.

[0008] As an improvement of the above solution, the rotating mechanism includes a hydraulic cylinder and a connecting block. The first rotating plate is hinged with a hydraulic cylinder, the bottom of the second rotating plate is connected to a connecting block, and the telescopic rod of the hydraulic cylinder is hingedly connected to the connecting block.

[0009] As an improvement of the above-mentioned scheme, the limiting mechanism includes a first limiting plate, a bidirectional screw and a knob. The left and right sides of the top of the placement frame are slidably connected with the first limiting plates for limiting the photovoltaic panel. The top of the placement frame is rotatably connected with the bidirectional screw. The two first limiting plates are threadedly connected to the bidirectional screw, and the bidirectional screw is connected with a knob.

[0010] As an improvement of the above scheme, it also includes a second limit plate, a mounting plate, a cylinder and a limit sleeve. The second limit plate is connected to the bottom of the second rotating plate, a mounting plate is connected between two adjacent brackets, a cylinder is installed on the top of the mounting plate, the telescopic rod of the cylinder is connected to the limit sleeve, and the second limit plate is located in the limit sleeve.

[0011] As an improvement of the above scheme, it also includes a guide plate, the bracket is connected to the guide plate, the guide plate is connected to the mounting plate, the top of the guide plate is opened with a guide groove, the limit sleeve is located in the guide groove, and the limit sleeve and the guide groove are slidably matched.

[0012] As an improvement of the above scheme, it also includes a first telescopic tube and a second telescopic tube. The first limit plate is rotatably connected to the first telescopic tube for protecting the bidirectional screw rod. The two first telescopic tubes are respectively connected to the left and right ends of the bidirectional screw rod, and the bidirectional screw rod is located in the first telescopic tube. The knob is rotatably connected to the second telescopic tube for protecting the bidirectional screw rod. The second telescopic tube is connected to the first limit plate, and the bidirectional screw rod is located in the second telescopic tube.

[0013] As an improvement of the above solution, a support frame is also included, and the right side of the first rotating plate is connected to the support frame.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention can push the first rotating plate through the push block to assist the photovoltaic panel to rotate to the right. The photovoltaic panel can be driven to rotate downward by extending the telescopic rod of the hydraulic cylinder, and the photovoltaic panel can be flipped over to make the photovoltaic panel close to the ground, thereby avoiding the risk of high-altitude operations, facilitating the maintenance of the photovoltaic panel, ensuring the personal safety of maintenance personnel, reducing the difficulty of operation, shortening the maintenance time, and improving the maintenance efficiency.

[0016] 2. The second rotating plate can be further limited by the limiting sleeve and the second limiting plate to share the locking force exerted by the electric shaft. The limiting sleeve can be guided by the guide plate to improve the stability of the limiting sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the crossbeam, the first rotating plate and the second rotating plate of the present invention is shown.

[0019] Figure 3 A schematic diagram of the three-dimensional structure of the second rotating plate, the placement frame and the photovoltaic panel of the present invention is shown.

[0020] Figure 4 The three-dimensional structural schematic diagram of the electric rotating shaft, winding wheel, mounting shaft, fixed pulley, wire rope and connecting frame of the present invention is shown.

[0021] Figure 5 A schematic diagram of the three-dimensional structure of the nitrogen spring of the present invention is shown.

[0022] Figure 6 The three-dimensional structural schematic diagram of the nitrogen spring and the push block of the present invention is shown.

[0023] Figure 7 A three-dimensional structural schematic diagram of the hydraulic cylinder and the connecting block of the present invention is shown.

[0024] Figure 8The figure shows the state after the second rotating plate of the present invention rotates to the right.

[0025] Fig. 9 The figure shows the state after the second rotating plate of the present invention rotates downward.

[0026] Fig.10 A schematic diagram of the three-dimensional structure of the first limit plate, the bidirectional screw rod and the knob of the present invention is shown.

[0027] Fig.11 A schematic diagram of the three-dimensional structure of the second limiting plate of the present invention is shown.

[0028] Fig.12 A three-dimensional structural schematic diagram of the mounting plate, cylinder and limiting sleeve of the present invention is shown.

[0029] Fig.13 A schematic diagram of the three-dimensional structure of the guide plate of the present invention is shown.

[0030] Fig.14 A three-dimensional structural schematic diagram of the guide plate and the guide groove of the present invention is shown.

[0031] Fig.15 A schematic diagram of the three-dimensional structure of the first telescopic tube and the second telescopic tube of the present invention is shown.

[0032] Names of the numbers in the figure: 1. base, 2. bracket, 3. beam, 4. first rotating plate, 5. second rotating plate, 6. placement frame, 7. photovoltaic panel, 8. electric shaft, 9. winding wheel, 10. mounting shaft, 11. fixed pulley, 12. wire rope, 13. connecting frame, 141. nitrogen spring, 142. push block, 151. hydraulic cylinder, 152. connecting block, 161. first limit plate, 162. two-way screw rod, 163. knob, 171. second limit plate, 172. mounting plate, 173. cylinder, 174. limit sleeve, 181. guide plate, 182. guide groove, 191. first telescopic tube, 192. second telescopic tube, 20. support frame. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0034] Reference Figure 1-Figure 10A flip-type photovoltaic carport that is easy to maintain includes a base 1, a bracket 2, a beam 3, a first rotating plate 4, a second rotating plate 5, a placement frame 6, a photovoltaic panel 7, an electric rotating shaft 8, a winding wheel 9, an installation shaft 10, a fixed pulley 11, a wire rope 12, a connecting frame 13, a pushing mechanism, a rotating mechanism and a limiting mechanism. Four brackets 2 are evenly spaced and connected to the top of the base 1 by bolts, and three beams 3 are evenly spaced and connected to the top of the four brackets 2. The right sides of two adjacent brackets 2 are jointly connected to the first rotating plate 4, and the top of the first rotating plate 4 is rotatably connected to the second rotating plate 5. The bottom of the second rotating plate 5 contacts the top of the beam 3, and the beam 3 can support the second rotating plate 5. Nine placement frames 6 are evenly spaced and connected to the top of the second rotating plate 5. Photovoltaic panels 7 are placed in the placement frames 6. Electric rotating shafts 8 are installed on the upper parts of two adjacent brackets 2. The electric rotating shaft 8 Two winding wheels 9 are connected to the top, and the upper parts of the two adjacent brackets 2 are commonly connected to the mounting shaft 10, and the mounting shaft 10 is connected to two fixed pulleys 11, and the winding wheels 9 are wound with wire ropes 12, and the wire ropes 12 pass around the fixed pulleys 11, and the fixed pulleys 11 can guide the wire ropes 12 to prevent the wire ropes 12 from loosening, and the fixed pulleys 11 can disperse the force applied to one point to multiple supporting points, reduce the pressure on a single supporting point, and reduce the load on the electric rotating shaft 8. The upper left part of the first rotating plate 4 is connected to a connecting frame 13 by bolts, and the right end of the wire rope 12 is connected to the left side of the connecting frame 13. The connecting frame 13 is pulled by two wire ropes 12, which is safer and more stable. The pushing mechanism is used to push the first rotating plate 4 to assist the photovoltaic panel 7 to rotate to the right, the rotating mechanism is used to control the photovoltaic panel 7 to rotate downward, and the limiting mechanism is used to limit the photovoltaic panel 7 in the placement frame 6.

[0035] Reference Figure 5 and Figure 6 The pushing mechanism includes a nitrogen spring 141 and a push block 142. The nitrogen spring 141 is installed on the side where two adjacent brackets 2 are close to each other. The right end of the nitrogen spring 141 is connected to the push block 142 through a universal ball. The right side of the push block 142 contacts the left side of the first rotating plate 4. The nitrogen spring 141 and the push block 142 are connected through a universal ball, so that the push block 142 can adapt to the angle change of the first rotating plate 4.

[0036] Reference Figure 7 The rotating mechanism includes a hydraulic cylinder 151 and a connecting block 152. The upper left part of the first rotating plate 4 is hinged with the hydraulic cylinder 151, and the right bottom part of the second rotating plate 5 is connected to the connecting block 152 by bolts. The telescopic rod of the hydraulic cylinder 151 is hingedly connected to the connecting block 152.

[0037] Reference Fig.10The limiting mechanism includes a first limiting plate 161, a bidirectional screw rod 162 and a knob 163. The left and right sides of the top of the placing frame 6 are slidably connected with the first limiting plates 161, and the rear side of the top of the placing frame 6 is rotatably connected with the bidirectional screw rod 162. The two first limiting plates 161 are connected to the bidirectional screw rod 162 by threads. The threads on the two first limiting plates 161 are in opposite directions, so the bidirectional screw rod 162 can drive the two first limiting plates 161 to move in opposite directions. The left and right parts of the bidirectional screw rod 162 are connected with knobs 163.

[0038] Initially, the steel wire rope 12 pulls the connecting frame 13, the push block 142 contacts the first rotating plate 4, and the nitrogen spring 141 is in a compressed state; the vehicle can be parked under the second rotating plate 5, and the photovoltaic panel 7 can provide shade and protection for the vehicle, and can also provide power for the vehicle. When the photovoltaic panel 7 needs to be inspected and repaired, the maintenance personnel control the electric shaft 8 to drive the winding wheel 9 to rotate, release the steel wire rope 12, and the steel wire rope 12 no longer pulls the connecting frame 13. Under the action of the nitrogen spring 141, the push block 142 will move to the right, and the push block 142 will push the first rotating plate 4 to make the photovoltaic panel 7 rotate to the right, and the second rotating plate 5 and the cross beam 3 are out of contact, and the first limit plate 16 1 can limit the photovoltaic panel 7 to prevent the photovoltaic panel 7 from falling from the placement frame 6. When the push block 142 and the first rotating plate 4 are out of contact, as the wire rope 12 continues to be released, the first rotating plate 4 continues to rotate to the right under the action of its own gravity to ensure that the photovoltaic panel 7 can be rotated to the predetermined position. Then the maintenance personnel control the telescopic rod of the hydraulic cylinder 151 to extend, drive the connecting block 152 to rotate backward, the connecting block 152 drives the second rotating plate 5 to rotate downward, and the second rotating plate 5 drives the photovoltaic panel 7 to rotate downward, flipping the photovoltaic panel 7 to make the photovoltaic panel 7 close to the ground, avoiding the risk of high-altitude operations, facilitating the maintenance of the photovoltaic panel 7, and ensuring the safety of the maintenance personnel. The maintenance personnel then turns the knob 163, which drives the bidirectional screw rod 162 to rotate, and the bidirectional screw rod 162 drives the two first limit plates 161 to move away from each other, so that the first limit plates 161 no longer limit the photovoltaic panel 7. The maintenance personnel can take the photovoltaic panel 7 out of the placement frame 6 for maintenance. After the maintenance is completed, the photovoltaic panel 7 is put back into the placement frame 6, and then the knob 163 is turned in the opposite direction, and the knob 163 drives the bidirectional screw rod 162 to rotate in the opposite direction, and the bidirectional screw rod 162 drives the two first limit plates 161 to move towards each other, so that the first limit plates 161 no longer limit the photovoltaic panel 7. The maintenance personnel can take the photovoltaic panel 7 out of the placement frame 6 for maintenance. After the maintenance is completed, the photovoltaic panel 7 is put back into the placement frame 6, and then the knob 163 is turned in the opposite direction, and the knob 163 drives the bidirectional screw rod 162 to rotate in the opposite direction, and the bidirectional screw rod 162 drives the two first limit plates 161 to move towards each other, so that the first limit plates 161 The limit plate 161 limits the photovoltaic panel 7 again to facilitate the fixation of the photovoltaic panel 7, and then controls the telescopic rod of the hydraulic cylinder 151 to shorten, driving the photovoltaic panel 7 to rotate upward and reset, and then controls the electric shaft 8 to drive the winding wheel 9 to rotate in the opposite direction, so that the winding wheel 9 reels the wire rope 12, and the wire rope 12 pulls the connecting frame 13 to rotate left, and the connecting frame 13 drives the first rotating plate 4 and the second rotating plate 5 to rotate left, and the second rotating plate 5 drives the photovoltaic panel 7 to rotate left and reset, so that the second rotating plate 5 and the crossbeam 3 contact each other again, and the first rotating plate 4 will contact the push block 142 during the left rotation, and push the push block 142 to move left, and the nitrogen spring 141 is compressed.

[0039] Reference Fig.11 and Fig.12, also includes a second limiting plate 171, a mounting plate 172, a cylinder 173 and a limiting sleeve 174, the second limiting plate 171 is connected to the front and rear sides of the left side of the bottom of the second rotating plate 5, the mounting plate 172 is connected between two adjacent brackets 2 by bolts, the cylinder 173 is installed on the front and rear sides of the top of the mounting plate 172 by bolts, the left end of the telescopic rod of the cylinder 173 is connected to the limiting sleeve 174, and the second limiting plate 171 is located in the limiting sleeve 174.

[0040] Initially, the telescopic rod of the cylinder 173 is in an extended state, and the second limit plate 171 is located in the limit sleeve 174. The limit sleeve 174 and the second limit plate 171 can further limit the second rotating plate 5, sharing the locking force exerted by the electric shaft 8. When the photovoltaic panel 7 needs to be inspected, the telescopic rod of the cylinder 173 is controlled to shorten, driving the limit sleeve 174 to move to the right, so that the limit sleeve 174 and the second limit plate 171 are disengaged, so that the second rotating plate 5 can rotate.

[0041] Reference Fig.13 and Fig.14 , and also includes a guide plate 181. The sides of two adjacent brackets 2 that are close to each other are connected with the guide plate 181. The right side of the guide plate 181 is connected to the left side of the mounting plate 172. The top of the guide plate 181 is provided with a guide groove 182. The limiting sleeve 174 is located in the guide groove 182, and the limiting sleeve 174 and the guide groove 182 are slidably matched. The guide plate 181 can guide the limiting sleeve 174 to improve the stability of the limiting sleeve 174.

[0042] Reference Fig.15 , also includes a first telescopic tube 191 and a second telescopic tube 192. The two first limit plates 161 on the same placement frame 6 are rotatably connected to the first telescopic tube 191 on one side away from each other. The two first telescopic tubes 191 are respectively connected to the left and right ends of the bidirectional screw rod 162, and the bidirectional screw rod 162 is located in the first telescopic tube 191. The two knobs 163 on the same bidirectional screw rod 162 are rotatably connected to the second telescopic tube 192 on one side away from each other. The second telescopic tube 192 is connected to the first limit plate 161, and the bidirectional screw rod 162 is located in the second telescopic tube 192.

[0043] The first telescopic tube 191 and the second telescopic tube 192 can protect the bidirectional screw rod 162 to prevent the bidirectional screw rod 162 from being oxidized and rusted due to long-term wind and sun exposure. When the first limit plate 161 moves, the first telescopic tube 191 and the second telescopic tube 192 adaptively extend and shorten to ensure that the first limit plate 161 can move normally.

[0044] Reference Figure 2 and Figure 8, also includes a support frame 20, the front and rear sides of the right side of the first rotating plate 4 are connected to the support frame 20, when the first rotating plate 4 moves to the right, the support frame 20 will contact the base 1, the support frame 20 can support the first rotating plate 4, and improve the stability of the first rotating plate 4.

[0045] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. A flip-type photovoltaic carport that is easy to maintain, comprising a base (1), a bracket (2) and a crossbeam (3), wherein the top of the base (1) is evenly spaced and connected to the brackets (2), and the top of the bracket (2) is connected to the crossbeam (3), wherein: The invention also comprises a first rotating plate (4), a second rotating plate (5), a placement frame (6), a photovoltaic panel (7), an electric rotating shaft (8), a winding wheel (9), a mounting shaft (10), a fixed pulley (11), a steel wire rope (12), a connecting frame (13), a pushing mechanism, a rotating mechanism and a limiting mechanism. The first rotating plate (4) is rotatably connected to two adjacent brackets (2). The top of the first rotating plate (4) is rotatably connected to the second rotating plate (5). The top of the second rotating plate (5) is connected to the placement frame (6). The photovoltaic panel (7) is placed in the placement frame (6). The electric rotating shaft (8) is installed on the two adjacent brackets (2). , the electric rotating shaft (8) is connected to a winding wheel (9), the two adjacent brackets (2) are commonly connected to a mounting shaft (10), the mounting shaft (10) is connected to a fixed pulley (11), a steel wire rope (12) is wound around the winding wheel (9), the steel wire rope (12) is wound around the fixed pulley (11), the first rotating plate (4) is connected to a connecting frame (13), the steel wire rope (12) and the connecting frame (13) are connected, the pushing mechanism is used to push the first rotating plate (4) to assist the photovoltaic panel (7) to rotate rightward, the rotating mechanism is used to control the photovoltaic panel (7) to rotate downward, and the limiting mechanism is used to limit the photovoltaic panel (7) in the placement frame (6).

2. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 1 is characterized in that: The pushing mechanism comprises a nitrogen spring (141) and a pushing block (142). The bracket (2) is provided with a nitrogen spring (141). The nitrogen spring (141) is connected with a pushing block (142) via a universal ball. The right side of the pushing block (142) contacts the left side of the first rotating plate (4).

3. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 2 is characterized in that: The rotating mechanism comprises a hydraulic cylinder (151) and a connecting block (152); the first rotating plate (4) is hingedly connected with the hydraulic cylinder (151); the bottom of the second rotating plate (5) is connected with the connecting block (152); and the telescopic rod of the hydraulic cylinder (151) and the connecting block (152) are hingedly connected.

4. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 3 is characterized in that: The limiting mechanism comprises a first limiting plate (161), a bidirectional screw rod (162) and a knob (163); the first limiting plates (161) for limiting the photovoltaic panel (7) are slidably connected to the left and right sides of the top of the placement frame (6); the bidirectional screw rod (162) is rotatably connected to the top of the placement frame (6); the two first limiting plates (161) are connected to the bidirectional screw rod (162) by threads; and the bidirectional screw rod (162) is connected to the knob (163).

5. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 4 is characterized in that: It also includes a second limiting plate (171), a mounting plate (172), a cylinder (173) and a limiting sleeve (174); the second limiting plate (171) is connected to the bottom of the second rotating plate (5); the mounting plate (172) is connected between two adjacent brackets (2); the cylinder (173) is installed on the top of the mounting plate (172); the limiting sleeve (174) is connected to the telescopic rod of the cylinder (173); and the second limiting plate (171) is located in the limiting sleeve (174).

6. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 5 is characterized in that: The guide plate (181) is also included. The bracket (2) is connected to the guide plate (181). The guide plate (181) is connected to the mounting plate (172). The top of the guide plate (181) is provided with a guide groove (182). The limiting sleeve (174) is located in the guide groove (182), and the limiting sleeve (174) and the guide groove (182) are slidably matched.

7. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 6 is characterized in that: The invention also comprises a first telescopic tube (191) and a second telescopic tube (192); the first limit plate (161) is rotatably connected to the first telescopic tube (191) for protecting the bidirectional screw rod (162); the two first telescopic tubes (191) are respectively connected to the left and right ends of the bidirectional screw rod (162); the bidirectional screw rod (162) is located in the first telescopic tube (191); the knob (163) is rotatably connected to the second telescopic tube (192) for protecting the bidirectional screw rod (162); the second telescopic tube (192) is connected to the first limit plate (161); and the bidirectional screw rod (162) is located in the second telescopic tube (192).

8. The flip-type photovoltaic carport that is easy to maintain as claimed in claim 7 is characterized in that: It also includes a support frame (20), and the right side of the first rotating plate (4) is connected to the support frame (20).

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