A car repair tilting device for car repair

Abstract

The present invention relates to the field of automobile maintenance technology, and discloses an automobile maintenance tilting device for automobile maintenance, including a mounting assembly, wherein the mounting assembly includes a bottom support plate, and the outer surface of the bottom support plate is provided with a slope. The present invention drives the second drive rod to rotate the first connecting block through the drive of the second motor, and pulls the telescopic rod, because the second connecting block is installed on the outer surface of the first adjustment block, the first adjustment block is pulled to slide on the outer surface of the limit rod, and because the first support rod and the second support rod are connected through the second support roller, when the first support rod is adjusted, the second adjustment block is synchronously driven to slide on the outer surface of the limit rod, ensuring that the first adjustment block and the second adjustment block are moved and adjusted to approach each other, and the top plate is raised to ensure that after the anti-slip support rod is raised, it is against the chassis of the car to lift the car, which has an effect similar to that of a jack, and reduces the dependence of the device on external devices.

Description

Technical Field

[0001] The invention relates to the technical field of automobile maintenance, and in particular to an automobile maintenance tilting device for automobile maintenance. Background Art

[0002] With the development of the automobile industry, the structure of automobiles is becoming more and more complex, especially the chassis part which integrates numerous electronic devices, complex suspension systems and various pipelines. When repairing or maintaining the automobile chassis, more convenient and accurate equipment is needed to operate; However, there are still many defects in the actual use of maintenance equipment. For example, the existing maintenance equipment may not be stable enough when supporting the car, resulting in safety hazards during the maintenance process. At the same time, the existing maintenance equipment may need to rely on more external equipment, such as additional jacks, etc. to assist in supporting the car. Therefore, it is necessary to design a car maintenance tilting device for car maintenance. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a car repair tilting device for car repair.

[0004] The present invention is implemented by the following technical scheme: an automobile maintenance tilting device for automobile maintenance, comprising a mounting assembly, the mounting assembly comprising a bottom support plate, the outer surface of the bottom support plate is provided with a slope, a first mounting seat and a second mounting seat are fixedly mounted on the top of the bottom support plate, a support block is fixedly mounted on the outer surface of the bottom support plate, a slide rail is fixedly mounted on the top of the support block, and further comprising: A first lifting assembly, the first lifting assembly comprising a first motor, a first driving rod being fixedly mounted on an output end of the first motor, a first moving seat being threadedly connected to an outer surface of the first driving rod, and a moving plate being fixedly mounted on a top of the first moving seat; The second lifting assembly comprises a third mounting seat, a second motor is fixed on the outer surface of the third mounting seat, a second driving rod is fixedly mounted on the output end of the second motor, and a first connecting block is fixedly mounted on the outer surface of the second driving rod.

[0005] As a further improvement of the above scheme, a first motor is fixedly installed inside the first mounting seat, a first driving rod is rotatably installed inside the second mounting seat, a first movable seat is fixedly installed on the outer surface of the movable plate, and a first movable rod is fixedly installed inside the first movable seat.

[0006] Through the above technical solution, the first motor is the power core of the entire equipment, which can drive the movement of a series of subsequent components and enable the equipment to realize the tilting function of automobile maintenance.

[0007] As a further improvement of the above scheme, a first connecting rod is sleeved on the outer surface of the first movable rod, and one end of the first connecting rod away from the first movable rod is rotatably installed inside the second movable seat. A first mounting plate is fixedly installed on the top of the second movable seat, and a top support plate is fixedly installed on the top of the first mounting plate.

[0008] Through the above technical solution, such a structure connects the movement of each component with the top support plate, and finally realizes the control of the lifting and lowering of the top support plate through the coordinated movement of a series of components, thereby providing a suitable support platform for automobile maintenance.

[0009] As a further improvement of the above scheme, a first support roller is fixedly installed at the central position of the first connecting rod, and a first auxiliary support assembly is rotatably installed on the outer surface of the first support roller. The first auxiliary support assembly includes a second connecting rod, and the second connecting rod, and the bottom of the second connecting rod is rotatably installed on the outer surface of the second movable rod.

[0010] Through the above technical solution, this structure enables the movement of the first connecting rod to be transmitted to the first auxiliary support assembly through the first support roller, and the second movable rod provides stable rotational support for the second connecting rod, thereby enhancing the stability and reliability of the entire device in the process of supporting the car.

[0011] As a further improvement of the above solution, a third movable seat is fixedly installed on the outer surface of the second movable rod, a second movable seat is fixedly installed on the bottom of the third movable seat, and the second movable seat is slidably installed inside the slide rail.

[0012] Through the above technical solution, the sliding of the second movable seat in the slide rail is realized, the movement of the components is limited, the directional accuracy of the movement of the components is ensured, and the cooperation between the components of the entire equipment during operation is also made more coordinated and orderly.

[0013] As a further improvement of the above scheme, one end of the second connecting rod away from the second movable rod is rotatably installed inside the fourth movable seat, a second mounting plate is fixedly installed on the top of the fourth movable seat, a top support plate is slidably installed on the top of the second mounting plate, and an auxiliary groove is opened inside the top support plate.

[0014] Through the above technical solution, this structure further improves the support system of the top support plate, and multiple components work together to ensure the stability of the top support plate during the lifting process.

[0015] As a further improvement of the above scheme, a third mounting seat is fixedly installed at the central position of the top of the bottom support plate, a telescopic rod is fixedly installed on the outer surface of the first connecting block, a second connecting block is fixedly installed on the top of the telescopic rod, the second connecting block is rotatably installed on the outer surface of the first adjusting block at one end away from the telescopic rod, a limiting rod is arranged inside the first adjusting block, and the first adjusting block is slidably installed on the outer surface of the limiting rod.

[0016] Through the above technical solution, this structure constructs an adjustable support structure. Through the extension and retraction of the telescopic rod and the sliding of the first adjustment block on the limit rod, the support height of the equipment can be adjusted to meet different automobile maintenance needs.

[0017] As a further improvement of the above scheme, a first support rod is rotatably installed on a side of the outer surface of the first adjustment block away from the second connecting block, and one end of the first support rod away from the first adjustment block is rotatably installed inside the first support seat, a top plate is fixedly installed on the top of the first support seat, and an anti-slip support rod is fixedly installed on the top of the top plate.

[0018] Through the above technical solution, this structure constructs a stable support system, and the anti-skid support rod can effectively support the chassis of the car to prevent the car from sliding during the maintenance process, thereby ensuring the safety of the maintenance operation.

[0019] As a further improvement of the above scheme, a second auxiliary support assembly is fixedly installed at the central position of the first support rod, and the second auxiliary support assembly includes a second support roller, and a second support rod is rotatably installed on the side of the second support roller away from the first support rod, and the bottom of the second support rod is rotatably installed on the outer surface of the second adjustment block.

[0020] Through the above technical solution, this structure further enhances the supporting capacity of the automobile. The second auxiliary supporting assembly makes the supporting structure more stable through the connection and rotation relationship of each component, and can better cope with the weight of the automobile and various forces during the maintenance process.

[0021] As a further improvement of the above solution, the second adjustment block is slidably installed on the outer surface of the limiting rod, and the end of the second support rod away from the second adjustment block is rotatably installed inside the second support seat, and a top plate is provided on the top of the second support seat.

[0022] Through the above technical solution, this structure works together with other components to jointly build a complete support system for the automobile repair tilting equipment, ensuring that the equipment can stably support the car when repairing it, and the movement and cooperation between the various components are more coordinated.

[0023] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the first moving seat to slide and adjust in the first driving rod through the electric drive of the first motor, and ensures that the moving plate slides in the slide rail. At this time, the first connecting rod is used to simultaneously pull the first auxiliary support assembly in the slide rail to move and adjust the moving plate closer to each other, ensuring that the height of the top support plate is adjusted. When the vehicle is parked at the top support plate, the drive of the first motor ensures that the vehicle is lifted, which is convenient for maintenance personnel to repair or maintain the vehicle.

[0024] The present invention drives the second driving rod to rotate the first connecting block through the driving of the second motor, and utilizes the pulling of the telescopic rod, and the second connecting block is installed on the outer surface of the first adjusting block, so as to pull the first adjusting block to slide on the outer surface of the limiting rod. Since the first support rod and the second support rod are connected through the second supporting roller, when the first support rod is adjusted, the second adjusting block is simultaneously driven to slide on the outer surface of the limiting rod, ensuring that the first adjusting block and the second adjusting block are moved and adjusted close to each other, and the top plate is raised to ensure that the anti-slip support rod, after being raised, resists against the chassis of the car, and lifts up the car, thereby achieving an effect similar to that of a jack, thereby reducing the dependence of the device on external devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first lifting assembly of the present invention; Figure 3 This is a schematic structural diagram of the first auxiliary support assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the installation assembly of the present invention; Figure 5 This is a schematic diagram of the structure of the second lifting assembly of the present invention; Figure 6 It is a schematic diagram of the overall structural effect of the present invention.

[0026] Description of main symbols: 1. Mounting assembly; 101. Bottom support plate; 102. Slope; 103. First mounting seat; 104. Second mounting seat; 105. Support block; 106. Slide rail; 2. First lifting assembly; 201. First motor; 202. First driving rod; 203. First moving seat; 204. Moving plate; 205. First moving seat; 206. First moving rod; 207. First connecting rod; 208. Second moving seat; 209. First mounting plate; 210. First supporting roller; 3. First auxiliary supporting assembly; 301. Second connecting rod; 302. Second moving rod; 303. Third moving seat; 304. Second moving plate; 205. First moving seat; 206. First moving rod; 207. First connecting rod; 208. Second moving seat; 209. First mounting plate; 210. First supporting roller; 3. First auxiliary supporting assembly; 301. Second connecting rod; 302. Second moving rod; 303. Third moving seat; 304. Movable seat; 305, fourth movable seat; 306, second mounting plate; 307, top support plate; 308, auxiliary slot; 4, second lifting assembly; 401, third mounting seat; 402, second motor; 403, second driving rod; 404, first connecting block; 405, telescopic rod; 406, second connecting block; 407, first adjusting block; 408, limiting rod; 409, first supporting rod; 410, first supporting seat; 411, top plate; 412, anti-slip supporting rod; 5, second auxiliary supporting assembly; 501, second supporting roller; 502, second supporting rod; 503, second adjusting block; 504, second supporting seat. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. Example

[0028] Please combine Figure 1-6 The present embodiment is a vehicle maintenance tilting device for vehicle maintenance, comprising a mounting assembly 1, the mounting assembly 1 comprising a bottom support plate 101, the outer surface of the bottom support plate 101 is provided with a slope 102, the top of the bottom support plate 101 is fixedly mounted with a first mounting seat 103 and a second mounting seat 104, the outer surface of the bottom support plate 101 is fixedly mounted with a support block 105, the top of the support block 105 is fixedly mounted with a slide rail 106, and further comprising: A first lifting assembly 2, the first lifting assembly 2 comprises a first motor 201, a first driving rod 202 is fixedly mounted on the output end of the first motor 201, a first moving seat 203 is threadedly connected to the outer surface of the first driving rod 202, and a moving plate 204 is fixedly mounted on the top of the first moving seat 203; The second lifting assembly 4 includes a third mounting seat 401 , the outer surface of the third mounting seat 401 is fixed with a second motor 402 , the output end of the second motor 402 is fixedly mounted with a second driving rod 403 , and the outer surface of the second driving rod 403 is fixedly mounted with a first connecting block 404 .

[0029] A first motor 201 is fixedly installed inside the first mounting seat 103 , a first driving rod 202 is rotatably installed inside the second mounting seat 104 , a first movable seat 205 is fixedly installed on the outer surface of the movable plate 204 , and a first movable rod 206 is fixedly installed inside the first movable seat 205 .

[0030] The outer surface of the first movable rod 206 is sleeved with the first connecting rod 207, and the end of the first connecting rod 207 away from the first movable rod 206 is rotatably installed inside the second movable seat 208. The top of the second movable seat 208 is fixedly installed with a first mounting plate 209, and the top of the first mounting plate 209 is fixedly installed with a top support plate 307.

[0031] A first supporting roller 210 is fixedly installed at the central position of the first connecting rod 207, and a first auxiliary supporting assembly 3 is rotatably installed on the outer surface of the first supporting roller 210. The first auxiliary supporting assembly 3 includes a second connecting rod 301, and the bottom of the second connecting rod 301 is rotatably installed on the outer surface of the second movable rod 302.

[0032] Through the rotation of the first driving rod 202, the first movable seat 203 will be driven to slide on its surface, and the first movable rod 206 is arranged in the first movable seat 205 on the top of the movable plate 204, which will pull the first connecting rod 207 for adjustment. Since one end of the first connecting rod 207 is movably installed in the second movable seat 208, and the first mounting plate 209 is threadedly installed in the top support plate 307, when the first motor 201 drives the movable plate 204 to slide to the left, it will drive the first connecting rod 207 to descend and at the same time drive the top support plate 307 to descend.

[0033] A third movable seat 303 is fixedly mounted on the outer surface of the second movable rod 302 , a second movable seat 304 is fixedly mounted on the bottom of the third movable seat 303 , and the second movable seat 304 is slidably mounted inside the slide rail 106 .

[0034] One end of the second connecting rod 301 away from the second movable rod 302 is rotatably installed inside the fourth movable seat 305, the top of the fourth movable seat 305 is fixedly installed with a second mounting plate 306, the top of the second mounting plate 306 is slidably installed with a top support plate 307, and the top support plate 307 has an auxiliary groove 308 inside.

[0035] Since the first auxiliary support assembly 3 is rotatably installed on the other side of the first support roller 210, the second connecting rod 301 will be driven to rotate in the second movable rod 302, and the third movable seat 303 will be pulled to slide to the right side in the slide rail 106 using the second movable seat 304. Since the second mounting plate 306 is slidably installed in the top support plate 307, it is ensured that when the first connecting rod 207 is driven, the second connecting rod 301 will cooperate with it to lift and lower the top support plate 307, ensuring that the car is lifted, which is convenient for maintenance personnel to repair or maintain the car. At the same time, the fourth movable seat 305 can ensure the smooth rotation of the second connecting rod 301.

[0036] A third mounting seat 401 is fixedly installed at the central position of the top of the bottom support plate 101, a telescopic rod 405 is fixedly installed on the outer surface of the first connecting block 404, a second connecting block 406 is fixedly installed on the top of the telescopic rod 405, and one end of the second connecting block 406 away from the telescopic rod 405 is rotatably installed on the outer surface of the first adjusting block 407, a limiting rod 408 is arranged inside the first adjusting block 407, and the first adjusting block 407 is slidably installed on the outer surface of the limiting rod 408.

[0037] A first support rod 409 is rotatably installed on one side of the outer surface of the first adjustment block 407 away from the second connecting block 406, and one end of the first support rod 409 away from the first adjustment block 407 is rotatably installed inside the first support seat 410. A top plate 411 is fixedly installed on the top of the first support seat 410, and an anti-slip support rod 412 is fixedly installed on the top of the top plate 411.

[0038] A second auxiliary support assembly 5 is fixedly installed at the central position of the first support rod 409, and the second auxiliary support assembly 5 includes a second support roller 501. A second support rod 502 is rotatably installed on the side of the second support roller 501 away from the first support rod 409, and the bottom of the second support rod 502 is rotatably installed on the outer surface of the second adjustment block 503.

[0039] The second adjustment block 503 is slidably mounted on the outer surface of the limiting rod 408 , and one end of the second support rod 502 away from the second adjustment block 503 is rotatably mounted inside the second support seat 504 . A top plate 411 is provided on the top of the second support seat 504 .

[0040] By driving the second motor 402, the second driving rod 403 is driven to rotate in the third mounting seat 401, and the first connecting block 404 is driven to rotate. By pulling the telescopic rod 405, since the second connecting block 406 is installed on the outer surface of the first adjusting block 407, the first adjusting block 407 is pulled to slide on the outer surface of the limiting rod 408. Since the first support rod 409 and the second auxiliary supporting assembly 5 are connected through the second supporting roller 501, when the first support rod 409 is adjusted, the second adjusting block 503 is synchronously driven to slide on the outer surface of the limiting rod 408, ensuring that the first adjusting block 407 and the second adjusting block 503 are moved and adjusted close to each other, and the top plate 411 is raised. The auxiliary groove 308 can prevent the top plate 411 from hitting the top support plate 307 when it rises, ensuring that the anti-slip support rod 412 is raised and against the chassis of the car to lift the car, which has an effect similar to that of a jack and reduces the dependence of the device on external devices.

[0041] The implementation principle of the automobile maintenance tilting device for automobile maintenance in the embodiment of the present application is as follows: the vehicle can be conveniently driven to the top support plate 307 through the ramp 102, and the first motor 201 is started at this time, and the first driving rod 202 will rotate under the limit of the second mounting seat 104, and the first mounting seat 103 can support the first motor 201 to ensure the stability of the first lifting component 2 during operation. The rotation of the first driving rod 202 will drive the first moving seat 203 to slide on its surface, and the first movable seat 205 at the top of the moving plate 204 is provided with a first movable seat 205. A movable rod 206 will pull the first connecting rod 207 for adjustment. Since one end of the first connecting rod 207 is movably mounted in the second movable seat 208, and the first mounting plate 209 is threadedly mounted in the top support plate 307, when the first motor 201 drives the movable plate 204 to slide to the left, the first connecting rod 207 will be driven to descend, and the top support plate 307 will be driven to descend, while the bottom support plate 101 can ensure that the mounting assembly 1 supports the first lifting assembly 2 and the second lifting assembly 4, and the support block 105 can support the slide rail 106; Since the first auxiliary support assembly 3 is rotatably installed on the other side of the first support roller 210, the second connecting rod 301 will be driven to rotate in the second movable rod 302, and the third movable seat 303 will be pulled to slide to the right in the slide rail 106 using the second movable seat 304. Since the second mounting plate 306 is slidably installed in the top support plate 307, it is ensured that when the first connecting rod 207 is driven, the second connecting rod 301 will cooperate with it to lift the top support plate 307, so as to ensure that the car is lifted, which is convenient for maintenance personnel to repair or maintain the car. At the same time, the fourth movable seat 305 can ensure the smooth rotation of the second connecting rod 301; The second motor 402 drives the second driving rod 403 to rotate in the third mounting seat 401, and drives the first connecting block 404 to rotate. The telescopic rod 405 pulls the second connecting block 406 mounted on the outer surface of the first adjusting block 407, which pulls the first adjusting block 407 to slide on the outer surface of the limiting rod 408. Since the first support rod 409 is connected to the second auxiliary support assembly 5 through the second support roller 501, when the first support rod 409 is adjusted, the second adjusting block 503 is synchronously driven to slide on the limiting rod 408. 08 outer surface slides to ensure that the first adjustment block 407 and the second adjustment block 503 are moved and adjusted close to each other, and the top plate 411 is raised, and the auxiliary groove 308 can prevent the top plate 411 from hitting the top support plate 307 when it rises, and ensure that the anti-slip support rod 412 is raised to support the chassis of the car and lift the car, which has a similar effect to a jack and reduces the dependence of the device on external devices. When the first support rod 409 and the second support rod 502 are adjusted, the first support seat 410 and the second support seat 504 can ensure that they rotate.

[0042] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An automobile maintenance tilting device for automobile maintenance, comprising a mounting assembly (1), the mounting assembly (1) comprising a bottom support plate (101), the outer surface of the bottom support plate (101) being provided with a slope (102), a first mounting seat (103) and a second mounting seat (104) being fixedly mounted on the top of the bottom support plate (101), a support block (105) being fixedly mounted on the outer surface of the bottom support plate (101), and a slide rail (106) being fixedly mounted on the top of the support block (105), characterized in that: Also includes: A first lifting assembly (2), the first lifting assembly (2) comprising a first motor (201), a first driving rod (202) being fixedly mounted on an output end of the first motor (201), a first moving seat (203) being threadedly connected to an outer surface of the first driving rod (202), and a moving plate (204) being fixedly mounted on a top of the first moving seat (203); A second lifting assembly (4), the second lifting assembly (4) comprising a third mounting seat (401), a second motor (402) being fixedly mounted on an outer surface of the third mounting seat (401), a second driving rod (403) being fixedly mounted on an output end of the second motor (402), and a first connecting block (404) being fixedly mounted on an outer surface of the second driving rod (403).

2. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 1, characterized in that: A first motor (201) is fixedly mounted inside the first mounting seat (103), a first driving rod (202) is rotatably mounted inside the second mounting seat (104), a first movable seat (205) is fixedly mounted on the outer surface of the movable plate (204), and a first movable rod (206) is fixedly mounted inside the first movable seat (205).

3. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 2, characterized in that: A first connecting rod (207) is sleeved on the outer surface of the first movable rod (206); one end of the first connecting rod (207) away from the first movable rod (206) is rotatably mounted inside the second movable seat (208); a first mounting plate (209) is fixedly mounted on the top of the second movable seat (208); and a top support plate (307) is fixedly mounted on the top of the first mounting plate (209).

4. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 3, characterized in that: A first supporting roller (210) is fixedly mounted at a central position of the first connecting rod (207), and a first auxiliary supporting assembly (3) is rotatably mounted on an outer surface of the first supporting roller (210). The first auxiliary supporting assembly (3) comprises a second connecting rod (301), and the bottom of the second connecting rod (301) is rotatably mounted on an outer surface of a second movable rod (302).

5. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 4, characterized in that: A third movable seat (303) is fixedly mounted on the outer surface of the second movable rod (302), a second movable seat (304) is fixedly mounted on the bottom of the third movable seat (303), and the second movable seat (304) is slidably mounted inside the slide rail (106).

6. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 4, characterized in that: One end of the second connecting rod (301) away from the second movable rod (302) is rotatably mounted inside the fourth movable seat (305), and a second mounting plate (306) is fixedly mounted on the top of the fourth movable seat (305), and a top supporting plate (307) is slidably mounted on the top of the second mounting plate (306), and an auxiliary groove (308) is opened inside the top supporting plate (307).

7. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 1, characterized in that: A third mounting seat (401) is fixedly mounted at a central position on the top of the bottom support plate (101); a telescopic rod (405) is fixedly mounted on the outer surface of the first connecting block (404); a second connecting block (406) is fixedly mounted on the top of the telescopic rod (405); an end of the second connecting block (406) away from the telescopic rod (405) is rotatably mounted on the outer surface of a first adjusting block (407); a limiting rod (408) is arranged inside the first adjusting block (407); and the first adjusting block (407) is slidably mounted on the outer surface of the limiting rod (408).

8. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 7, characterized in that: A first support rod (409) is rotatably mounted on a side of the outer surface of the first adjustment block (407) away from the second connection block (406); an end of the first support rod (409) away from the first adjustment block (407) is rotatably mounted inside a first support seat (410); a top plate (411) is fixedly mounted on the top of the first support seat (410); and an anti-slip support rod (412) is fixedly mounted on the top of the top plate (411).

9. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 8, characterized in that: A second auxiliary support assembly (5) is fixedly mounted at a central position of the first support rod (409), the second auxiliary support assembly (5) comprising a second support roller (501), a second support rod (502) being rotatably mounted on a side of the second support roller (501) away from the first support rod (409), the bottom of the second support rod (502) being rotatably mounted on an outer surface of a second adjustment block (503).

10. The vehicle maintenance tilting device for vehicle maintenance as claimed in claim 9, characterized in that: The second adjustment block (503) is slidably mounted on the outer surface of the limiting rod (408), and one end of the second support rod (502) away from the second adjustment block (503) is rotatably mounted inside the second support seat (504), and a top plate (411) is provided on the top of the second support seat (504).

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