Plastic frame pressing mechanism

Abstract

The utility model relates to the technical field of backboard processing, and particularly discloses a rubber frame pressing mechanism which comprises a frame body assembly. The device further comprises a supporting assembly. The first positioning assembly and the second positioning assembly are arranged at the top of the supporting assembly; the supporting assembly comprises a workbench A and a workbench B, a mounting frame A is arranged on one side of the workbench A, a top rod is mounted at the top of the mounting frame A, and a moving part A is mounted on the workbench A and used for adjusting the horizontal position of the mounting frame A; according to the utility model, the vertical pressing block is in contact with the side edge of the screen backboard, and the vertical pressing block downwards presses the rubber frame; the right-angle pressing block makes contact with the inner side of the rubber frame to play a role in pressure maintaining, tight attachment between the rubber frame and the back plate is further ensured through downward pressing and side pressing operation, the accurate position of the back plate in the horizontal direction can be ensured through side edge positioning, and a reference is provided for follow-up pressing of the rubber frame.

Description

Technical Field

[0001] The utility model relates to the technical field of backplane processing, in particular to a glue frame pressing mechanism. Background Art

[0002] In the processing of the screen backplane, after manually placing the glue frame and pasting it on the inner side edge of the screen backplane, it is moved to the pressing platform for pressing and positioning.

[0003] During pressing, it is necessary to position the screen backplane at the work station, and then adjust the pressing force on the glue frame. For example, in a pressing fixture for inner clamping in a module frame disclosed in the patent publication number CN217475854U, it includes a machine base and a semi-enclosed housing arranged on the upper part of the machine base. The surface of the machine base is provided with a backplane adsorption platform, and a pressing mechanism is arranged at the rear part inside the semi-enclosed housing; the pressing mechanism includes a pressing plate, a pressing plate downward cylinder, a glue frame downward cylinder, and a glue frame side pressing cylinder; the glue frame downward cylinder is longitudinally arranged at the side part of the pressing plate, and the glue frame side pressing cylinder is horizontally arranged at the bottom of the pressing plate; the output end of the glue frame downward cylinder is fixedly connected with a downward pressing strip; the output end of the glue frame side pressing cylinder is fixedly connected with a side pressing strip; by pushing the downward pressing strip to move downward by the glue frame downward cylinder and pushing the downward pressing strip to move outward by the glue frame side pressing cylinder, the pressing of the backplane and the glue frame is realized.

[0004] The above-mentioned pressing fixture can perform downward pressing and side pressing. However, during the pressing process, each side performs a single pressing, and its pressing stability still needs to be improved. Moreover, during the use of the fixture, it is not convenient to adjust and change the shape according to different sizes of backplanes. In view of the above problems, a glue frame pressing mechanism is proposed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a glue frame pressing mechanism to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A glue frame pressing mechanism includes a frame assembly;

[0008] It further includes:

[0009] A support assembly;

[0010] A first positioning assembly and a second positioning assembly arranged on the top of the support assembly;

[0011] The support assembly includes a workbench A and a workbench B. An installation frame A is arranged on one side of the workbench A, a top rod is installed on the top of the installation frame A, and a moving member A is installed on the workbench A for adjusting the horizontal position of the installation frame A;

[0012] On one side of the workbench B, there is an installation frame B. On one side of the installation frame B, a positioning block is installed. On one side of the top of the positioning block, there is a pressing block. The pressing block is connected to the installation frame B through a height adjusting member 1. A moving member B is installed on the workbench B for adjusting the horizontal position of the installation frame B;

[0013] The first positioning assembly includes a first lifting frame and two groups of symmetrically arranged first guiding seats. The first guiding seats are connected to a first sliding frame through a first lead screw member. On one side of the first sliding frame, a vertical positioning frame is arranged. The bottom of the vertical positioning frame is connected to a right-angle pressing block. An air cylinder C for adjusting the horizontal position of the vertical positioning frame is installed on the first sliding frame;

[0014] The second positioning assembly includes a second lifting frame and two groups of horizontal positioning frames. The second lifting frame is connected to the horizontal positioning frames through a second lead screw member. On one side of the horizontal positioning frames, a vertical pressing block is connected through a height adjusting member 2. A shaping block is arranged at the bottom of the horizontal positioning frames;

[0015] On the frame assembly, there is a first lifting member for adjusting the height of the first lifting frame; and there is also a second lifting member for adjusting the height of the second lifting frame.

[0016] In an alternative solution: The moving member A includes a motor A and a lead screw A connected to the motor shaft of the motor A. The motor A is installed on the workbench A. The installation frame A is connected to a moving frame A. The moving frame A is provided with a threaded hole A that cooperates with the lead screw A. At the bottom of the top plate of the workbench A, there is a guide rail A for the sliding of the moving frame A. The end of the ejector rod away from the installation frame A is connected to a roller.

[0017] In an alternative solution: The moving member B includes a motor B and a lead screw B connected to the motor shaft of the motor B. The installation frame B is connected to a moving frame B. The moving frame B is provided with a threaded hole B that is threadedly engaged with the lead screw B. At the bottom of the top plate of the workbench B, there is a guide rail B for the sliding of the moving frame B.

[0018] In an alternative solution: The height adjusting member 1 includes an air cylinder B installed on the installation frame B. The telescopic end of the air cylinder B is connected to a fixed block. The pressing block is connected to the fixed block.

[0019] In an alternative solution: The height adjusting member 2 includes an air cylinder D installed on the horizontal positioning frame. The telescopic end of the air cylinder D is connected to an adapter block. The vertical pressing block is installed on the adapter block.

[0020] In an alternative solution: The shaping block is slidably connected to the bottom of the horizontal positioning frame. An adjusting screw is threadedly connected to the horizontal positioning frame. The end of the adjusting screw is rotatably connected to the shaping block.

[0021] In an alternative solution: the frame assembly includes a support rod and a top frame connected to the top of the support rod. An elevating guide plate is installed at the bottom of the top frame, and elevating slide rails are installed on both sides of the elevating guide plate.

[0022] In an alternative solution: the first elevating member includes a first electric push rod, which is installed on the top frame. The telescopic end of the first electric push rod passes through the top frame and is connected to the first elevating frame;

[0023] The second elevating member includes a second electric push rod, which is installed on the top frame. The telescopic end of the second electric push rod passes through the top frame and is connected to the second elevating frame;

[0024] On the sides of the second elevating frame and the first elevating frame close to the elevating guide plate, there are elevating chutes that are slidably matched with the elevating slide rails.

[0025] In an alternative solution: at the bottom of the first guiding seat, there is a first slide rail for the first sliding frame to slide, and on one side of the second elevating frame, there is a second slide rail for the lateral positioning frame to slide.

[0026] In an alternative solution: the included angle between the first guiding seat and the first elevating frame is 30 degrees, and the included angle between the pneumatic telescopic rod C and the first elevating frame is 45 degrees.

[0027] Compared with the prior art, the beneficial effects of the present utility model are:

[0028] In the present utility model, the second elevating member adjusts the second elevating frame to descend, the second lead screw member adjusts the vertical pressing block to contact the side of the screen backplane, and the height adjusting member two can adjust the downward pressure of the vertical pressing block on the rubber frame; the first elevating member adjusts the first elevating frame to lower, the first lead screw member adjusts the horizontal position of the first sliding frame, so that the right-angle pressing block contacts the inner side of the rubber frame, and the pneumatic telescopic rod C can further adjust the position of the right-angle pressing block to shape and position the rubber frame, so that the right-angle pressing block stably contacts the rubber frame, playing a pressure-holding function. The downward pressing and side pressing operations further ensure the tight fit between the rubber frame and the backplane. Through side positioning, the accurate position of the backplane in the horizontal direction can be ensured, providing a reference for the subsequent pressing of the rubber frame;

[0029] In the present utility model, the screen backplane is placed on the workbench A and the workbench B, and the positions of the ejector rod and the positioning block can be adjusted, which can cooperate to fix the screen backplane, facilitating adjustment according to different sizes of the backplane;

[0030] In the present utility model, the structural design in the downward pressing and side pressing allows adjustment according to different backplanes, adapting to diverse production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the present utility model.

[0032] Figure 2 This is a schematic structural view of the side where the second positioning component is arranged in the present utility model.

[0033] Figure 3 This is a schematic structural view of the support component in the present utility model.

[0034] Figure 4 This is a schematic structural view of workbench A in the present utility model.

[0035] Figure 5 This is a schematic structural view of the bottom of workbench A in the present utility model.

[0036] Figure 6 This is a schematic structural view of workbench B in the present utility model.

[0037] Figure 7 This is a schematic structural view of the bottom of workbench B in the present utility model.

[0038] Figure 8 This is a schematic structural view of the first positioning component in the present utility model.

[0039] Figure 9 This is a schematic structural view of the second positioning component in the present utility model.

[0040] Figure 10 This is a schematic structural view of the frame assembly in the present utility model.

[0041] In the figure: 100, frame assembly; 101, support rod; 102, top frame; 103, lifting guide plate; 104, lifting slide rail; 200, support component; 201, workbench A; 202, mounting frame A; 203, top rod; 204, moving frame A; 205, roller; 206, motor A; 207, lead screw A; 208, guide rail A; 209, workbench B; 210, positioning block; 211, mounting frame B; 212, pneumatic telescopic rod B; 213, fixing block; 214, pressing block; 215, lead screw B; 216, moving frame B; 217, guide rail B; 218, motor B;

[0042] 300, first positioning component; 301, first lifting frame; 302, first electric push rod; 303, first guide seat; 304, first slide rail; 305, first sliding frame; 306, pneumatic telescopic rod C; 307, vertical positioning frame; 308, right-angle pressing block;

[0043] 400, second positioning component; 401, second lifting frame; 402, second electric push rod; 403, horizontal positioning frame; 404, second slide rail; 405, pneumatic telescopic rod D; 406, connecting block; 407, vertical pressing block; 408, shaping block; 409, adjusting screw. Detailed implementation manners

[0044] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0045] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0046] Please refer to Figures 1 - 10 , in this embodiment, a rubber frame pressing mechanism includes a frame assembly 100;

[0047] It further includes:

[0048] A support assembly 200;

[0049] A first positioning assembly 300 and a second positioning assembly 400 provided on the top of the support assembly 200;

[0050] The support assembly 200 includes a workbench A201 and a workbench B209. An installation frame A202 is provided on one side of the workbench A201. A top rod 203 is installed on the top of the installation frame A202. A moving member A is installed on the workbench A201 for adjusting the horizontal position of the installation frame A202;

[0051] An installation frame B211 is provided on one side of the workbench B209. A positioning block 210 is installed on one side of the installation frame B211. A pressing block 214 is provided on one side of the top of the positioning block 210. The pressing block 214 is connected to the installation frame B211 through a height adjusting member I. A moving member B is installed on the workbench B209 for adjusting the horizontal position of the installation frame B211;

[0052] The first positioning component 300 includes a first lifting frame 301 and two groups of symmetrically arranged first guide seats 303. The first guide seats 303 are connected to a first sliding frame 305 through a first lead screw member. A vertical positioning frame 307 is arranged on one side of the first sliding frame 305. The bottom of the vertical positioning frame 307 is connected to a right-angle pressing block 308. An air cylinder C306 for adjusting the horizontal position of the vertical positioning frame 307 is installed on the first sliding frame 305.

[0053] The second positioning component 400 includes a second lifting frame 401 and two groups of horizontal positioning frames 403. The second lifting frame 401 is connected to the horizontal positioning frames 403 through a second lead screw member. One side of the horizontal positioning frame 403 is connected to a vertical pressing block 407 through a height adjusting member II. A shaping block 408 is arranged at the bottom of the horizontal positioning frame 403; the first lead screw member and the second lead screw member are the cooperation of an existing driving motor, transmission components and a lead screw for driving linear movement, which will not be elaborated in this application.

[0054] A first lifting member is arranged on the frame assembly 100 for adjusting the height of the first lifting frame 301; a second lifting member is also arranged for adjusting the height of the second lifting frame 401.

[0055] In this embodiment, the screen backplane is placed on the workbench A 201 and the workbench B 209. The moving member A adjusts the horizontal position of the mounting frame A 202, and the moving member B adjusts the horizontal position of the mounting frame B 211. The ejector rod 203 and the positioning block 210 cooperate to fix the screen backplane; the second lifting member adjusts the second lifting frame 401 to descend, and the second lead screw member adjusts the vertical pressing block 407 to contact the side of the screen backplane. The height adjusting member II can adjust the downward pressure of the vertical pressing block 407 on the rubber frame; the first lifting member adjusts the first lifting frame 301 to lower, and the first lead screw member adjusts the horizontal position of the first sliding frame 305 to make the right-angle pressing block 308 contact the inner side of the rubber frame. The air cylinder C306 can further adjust the position of the right-angle pressing block 308 to shape and position the rubber frame, so that the right-angle pressing block 308 stably contacts the rubber frame.

[0056] As Figure 4 and Figure 5 shown, in another embodiment, the moving member A includes a motor A 206 and a lead screw A 207 connected to the motor shaft of the motor A 206. The motor A 206 is installed on the workbench A 201. The mounting frame A 202 is connected to a moving frame A 204. A threaded hole A cooperating with the lead screw A 207 is arranged on the moving frame A 204. A guide rail A 208 for the sliding of the moving frame A 204 is arranged at the bottom of the top plate of the workbench A 201. One end of the ejector rod 203 away from the mounting frame A 202 is connected to a roller 205.

[0057] When the motor A206 operates, it can drive the lead screw A207 to rotate, thereby driving the movement of the moving frame A204. The lifting rod 203 can be driven by the mounting bracket A202 to adjust the horizontal position. The roller 205 can contact the screen backplane. The lifting rod 203 cooperates with the positioning block 210 to fix the screen backplane, and corresponding adjustments can be made according to the size of the screen backplane.

[0058] As Figure 5 and Figure 6 shown, in another embodiment, the moving member B includes a motor B218 and a lead screw B215 connected to the motor shaft of the motor B218. The moving frame B216 is connected to the mounting bracket B211. A threaded hole B that is threadedly engaged with the lead screw B215 is provided on the moving frame B216. A guide rail B217 for the sliding of the moving frame B216 is provided at the bottom of the top plate of the workbench B209.

[0059] When the motor B218 is operating, it can drive the lead screw B215 to rotate, thereby driving the movement of the moving frame B216. The positions of the positioning block 210 and the pressing block 214 are adjusted through the mounting bracket B211, and the positioning block 210 can contact the side of the screen backplane.

[0060] As Figure 6 shown, in another embodiment, the height adjusting member 1 includes a pneumatic telescopic rod B212 mounted on the mounting bracket B211. The fixed block 213 is connected to the telescopic end of the pneumatic telescopic rod B212, and the pressing block 214 is connected to the fixed block 213.

[0061] When the pneumatic telescopic rod B212 operates, it can adjust the height of the fixed block 213, thereby adjusting the height of the pressing block 214. The pressing block 214 can press down on the rubber frame.

[0062] As Figure 9 shown, in another embodiment, the height adjusting member 2 includes a pneumatic telescopic rod D405 mounted on the horizontal positioning frame 403. The connecting block 406 is connected to the telescopic end of the pneumatic telescopic rod D405, and the vertical pressing block 407 is mounted on the connecting block 406. The pneumatic telescopic rod D405 can adjust the height of the connecting block 406, thereby adjusting the vertical pressing block 407 to press down on the rubber frame.

[0063] In another embodiment, the shaping block 408 is slidably connected to the bottom of the horizontal positioning frame 403. The adjusting screw 409 is threadedly connected to the horizontal positioning frame 403, and the end of the adjusting screw 409 is rotatably connected to the shaping block 408.

[0064] Before pressing, the horizontal position of the shaping block 408 can be finely adjusted using the adjusting screw 409 according to the size of the screen backplane.

[0065] In another embodiment, the frame assembly 100 includes a support rod 101 and a top frame 102 connected to the top of the support rod 101. A lifting guide plate 103 is installed at the bottom of the top frame 102, and lifting slide rails 104 are installed on both sides of the lifting guide plate 103.

[0066] In another embodiment, the first lifting member includes a first electric push rod 302. The first electric push rod 302 is installed on the top frame 102, and the telescopic end of the first electric push rod 302 passes through the top frame 102 and is connected to the first lifting frame 301.

[0067] The first electric push rod 302 can adjust the height of the first lifting frame 301.

[0068] The second lifting member includes a second electric push rod 402. The second electric push rod 402 is installed on the top frame 102, and the telescopic end of the second electric push rod 402 passes through the top frame 102 and is connected to the second lifting frame 401.

[0069] The second electric push rod 402 can adjust the height of the second lifting frame 401.

[0070] In another embodiment, lifting chutes that are slidably engaged with the lifting slide rails 104 are provided on one side of the second lifting frame 401 and the first lifting frame 301 close to the lifting guide plate 103. The second lifting frame 401 and the first lifting frame 301 can slide stably under the guidance of the lifting slide rails 104.

[0071] In another embodiment, a first slide rail 304 for the sliding of the first sliding frame 305 is provided at the bottom of the first guide seat 303, and a second slide rail 404 for the sliding of the lateral positioning frame 403 is provided on one side of the second lifting frame 401.

[0072] In another embodiment, the included angle between the first guide seat 303 and the first lifting frame 301 is 30 degrees, and the included angle between the pneumatic telescopic rod C306 and the first lifting frame 301 is 45 degrees; the first guide seat 303

[0073] The working principle of the present utility model is as follows: The screen backplane is placed on the workbench A201 and the workbench B209. The moving part A adjusts the horizontal position of the mounting bracket A202, and the moving part B adjusts the horizontal position of the mounting bracket B211. The ejector rod 203 and the positioning block 210 cooperate to fix the screen backplane. The second lifting part adjusts the second lifting frame 401 to descend, and the second lead screw part adjusts the vertical pressing block 407 to contact the side of the screen backplane. The height adjuster II can adjust the downward pressure of the vertical pressing block 407 on the rubber frame. The first lifting part adjusts the first lifting frame 301 to lower, and the first lead screw part adjusts the horizontal position of the first sliding frame 305, so that the right-angle pressing block 308 contacts the inner side of the rubber frame. The pneumatic telescopic rod C306 can further adjust the position of the right-angle pressing block 308 to shape and position the rubber frame, so that the right-angle pressing block 308 stably contacts the rubber frame.

[0074] The above is only the preferred embodiment of the present utility model, and it is not a limitation to the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still belong to the protection scope of the technical solution of the present utility model.

Claims

1. A rubber frame pressing mechanism, comprising a frame assembly (100); It is characterized in that Also includes: A support assembly (200); A first positioning assembly (300) and a second positioning assembly (400) disposed on the top of the supporting assembly (200); The support assembly (200) comprises a workbench A (201) and a workbench B (209); a mounting frame A (202) is provided on one side of the workbench A (201); a top rod (203) is installed on the top of the mounting frame A (202); and a moving part A is installed on the workbench A (201) for adjusting the horizontal position of the mounting frame A (202); A mounting frame B (211) is provided on one side of the workbench B (209), a positioning block (210) is installed on one side of the mounting frame B (211), a pressing block (214) is provided on one side of the top of the positioning block (210), and the pressing block (214) is connected to the mounting frame B (211) through a height adjustment member 1, and a moving member B is installed on the workbench B (209) for adjusting the horizontal position of the mounting frame B (211); The first positioning assembly (300) comprises a first lifting frame (301) and two groups of first guide seats (303) symmetrically arranged, the first guide seats (303) being connected to a first sliding frame (305) via a first screw member, a vertical positioning frame (307) being arranged on one side of the first sliding frame (305), a right-angle pressing block (308) being connected to the bottom of the vertical positioning frame (307), and a pneumatic telescopic rod C (306) for adjusting the horizontal position of the vertical positioning frame (307) being installed on the first sliding frame (305); The second positioning assembly (400) comprises a second lifting frame (401) and two groups of transverse positioning frames (403); the second lifting frame (401) is connected to the transverse positioning frame (403) via a second screw member; one side of the transverse positioning frame (403) is connected to a vertical pressing block (407) via a second height adjustment member; and a shaping block (408) is provided at the bottom of the transverse positioning frame (403); The frame assembly (100) is provided with a first lifting member for adjusting the height of the first lifting frame (301); and is also provided with a second lifting member for adjusting the height of the second lifting frame (401).

2. The rubber frame pressing mechanism according to claim 1, characterized in that: The moving part A comprises a motor A (206) and a screw rod A (207) connected to the motor shaft of the motor A (206); the motor A (206) is installed on a workbench A (201); the mounting frame A (202) is connected to a moving frame A (204); a screw hole A matching with the screw rod A (207) is provided on the moving frame A (204); a guide rail A (208) for sliding the moving frame A (204) is provided at the bottom of a top plate of the workbench A (201); and an end of the top rod (203) away from the mounting frame A (202) is connected to a roller (205).

3. The rubber frame pressing mechanism according to claim 1, characterized in that: The moving part B comprises a motor B (218) and a screw rod B (215) connected to the motor shaft of the motor B (218); the mounting frame B (211) is connected to a moving frame B (216); a screw hole B threadedly matched with the screw rod B (215) is provided on the moving frame B (216); and a guide rail B (217) for sliding the moving frame B (216) is provided at the bottom of the top plate of the workbench B (209).

4. The rubber frame pressing mechanism according to claim 1, characterized in that: The height adjustment member 1 comprises a pneumatic telescopic rod B (212) mounted on a mounting frame B (211), the telescopic end of the pneumatic telescopic rod B (212) being connected to a fixing block (213), and the pressing block (214) being connected to the fixing block (213).

5. The rubber frame pressing mechanism according to claim 1, characterized in that: The second height adjustment member comprises a pneumatic telescopic rod D (405) mounted on a transverse positioning frame (403), the telescopic end of the pneumatic telescopic rod D (405) is connected to a connecting block (406), and the vertical pressing block (407) is mounted on the connecting block (406).

6. The rubber frame pressing mechanism according to claim 1, characterized in that: The shaping block (408) is slidably connected to the bottom of the transverse positioning frame (403), and the transverse positioning frame (403) is threadedly connected to an adjusting screw (409), and the end of the adjusting screw (409) is rotatably connected to the shaping block (408).

7. The rubber frame pressing mechanism according to claim 1, characterized in that: The frame assembly (100) comprises a support rod (101) and a top frame (102) connected to the top of the support rod (101); a lifting guide plate (103) is installed at the bottom of the top frame (102); and lifting slide rails (104) are installed on both sides of the lifting guide plate (103).

8. The rubber frame pressing mechanism according to claim 7, characterized in that: The first lifting member comprises a first electric push rod (302), the first electric push rod (302) is installed on the top frame (102), and the telescopic end of the first electric push rod (302) passes through the top frame (102) and is connected to the first lifting frame (301); The second lifting member comprises a second electric push rod (402), the second electric push rod (402) is installed on the top frame (102), and the telescopic end of the second electric push rod (402) passes through the top frame (102) and is connected to the second lifting frame (401); The second lifting frame (401) and the first lifting frame (301) are both provided with a lifting slide groove slidably matched with the lifting slide rail (104) on one side close to the lifting guide plate (103).

9. The rubber frame pressing mechanism according to claim 1, characterized in that: A first slide rail (304) for the first sliding frame (305) to slide is provided at the bottom of the first guide seat (303), and a second slide rail (404) for the transverse positioning frame (403) to slide is provided on one side of the second lifting frame (401).

10. The rubber frame pressing mechanism according to claim 1, characterized in that: The included angle between the first guide seat (303) and the first lifting frame (301) is 30 degrees, and the included angle between the pneumatic telescopic rod C (306) and the first lifting frame (301) is 45 degrees.

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