Support for steel structure welding
By designing a steel structure welding bracket with an adjustment plate and a lifting mechanism, the problem of difficulty in fixing the small bottom or a special-shaped steel structure in the prior art is solved, and the convenience and efficiency of welding operation are improved.
Patent Information
- Application Number
- CN202421150141.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-24
AI Technical Summary
When using steel structure welding brackets with small bottom or special-shaped steel structures, it is difficult to effectively fix, resulting in inconvenient welding operation.
A steel structure welding bracket including an operating table, column, adjustment plate, lifting mechanism, frame, slide chute, screw and clamp are designed. Through the arrangement of the second screw, the height of the clamp can be adjusted; through the cooperation of the fourth screw and the adjustment mechanism, flexible movement and adjustment of the welded parts can be achieved.
It realizes stable fixation of the small bottom or special-shaped steel structure and flexible adjustment of welded parts, improving the convenience and efficiency of welding operations.
Smart Images
Figure CN222429709U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of brackets, in particular to a bracket for welding steel structures. Background Art
[0002] Steel structure welding brackets are used to support and fix the workpiece during steel structure welding. They can provide stable support to make welding operations safer and more convenient. Steel structure welding brackets are usually made of steel and have high strength and stability. They can adopt different designs and structures according to different welding processes, such as fixed supports, adjustable supports, etc. Using steel structure welding brackets can improve welding quality, ensure the accurate position and size of the weld, and also improve work efficiency and convenience of operation.
[0003] When some existing steel structure welding brackets are used, the steel structure is usually placed on the table first, and then fixed by the clamps on both sides. Because the clamps are close to the table, when encountering some steel structures with small bottoms or special shapes, they may not be fixed. Therefore, this problem needs to be solved. Utility Model Content
[0004] The utility model aims to solve the shortcomings in the prior art and provides a support for welding a steel structure.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A support for welding a steel structure comprises an operating table, the top of the operating table is fixedly connected to a column, one side of the column is slidably connected to an adjustment plate, the top of the column is provided with a lifting mechanism for lifting the adjustment plate, the top of the operating table is fixedly connected to a frame, the top of the frame close to the adjustment plate is symmetrically provided with two second slide grooves, the two second slide grooves are respectively provided with a fourth screw rod and a fourth limit rod, the fourth screw rod is rotatably connected to one side of the second slide groove, the fourth limit rod is fixedly connected to the inside of the second slide groove, the surfaces of the fourth screw rod and the fourth limit rod are sleeved with the same slide plate, the top of the slide plate is slidably connected to a welding piece, the top of the welding piece is provided with an adjustment mechanism for adjusting the welding piece, the fourth A second gear is sleeved on the end of the screw rod near one side of the column, and a rotating mechanism for rotating the fourth screw rod is provided on the surface of the second gear. Two second screw rods are symmetrically and slidably connected to the top of the operating table, and the tops of the two second screw rods are fixedly connected to a support frame, and the surfaces of the two second screw rods are provided with an upward mechanism for moving the support frame upward, one side of the support frame is fixedly connected to a second clamping plate, and one side of the other support frame is provided with a limiting column, and one side of the limiting column is sleeved with a third screw rod, and the surface of the third screw rod near the second clamping plate is fixedly connected to the first clamping plate, and the surface of the third screw rod is provided with an adjustment mechanism for adjusting the first clamping plate, and the height of the clamping plate can be adjusted by setting the second screw rod.
[0007] As a further solution of the utility model, the lifting mechanism includes a first screw rod, which is rotatably connected to the inside of the column, and a motor is fixedly connected to the top of the first screw rod, and the motor is fixedly connected to the top of the column. The adjustment plate is sleeved on the surface of the first screw rod, and the adjustment plate can be lifted and lowered by setting the first screw rod.
[0008] As a further solution of the present utility model, the adjusting mechanism includes a first slide groove, the first slide groove is opened on one side of the adjusting plate, the inner surface of the first slide groove is symmetrically fixedly connected with two first limit rods, the surfaces of the two first limit rods are slidably connected with the same pressure plate, the bottom of the pressure plate is rotatably connected with multiple pulleys, the top of the welding part is fixedly connected with a top plate, and the multiple pulleys cooperate with the top plate, the surface of the welding part close to the top plate is sleeved with a second spring, the top end of the second spring is fixedly connected to the bottom of the top plate, and the bottom end of the second spring is fixedly connected to the top of the slide plate, and the surfaces of the two first limit rods are provided with a resetting mechanism for resetting the pressure plate, and the welding part can be adjusted by setting the pressure plate.
[0009] As a further solution of the utility model, the reset mechanism includes a limit plate, which is fixedly connected to the top of the first limit rod. A first spring is sleeved on the surface of the first limit rod. The top end of the first spring is fixedly connected to the bottom of the limit plate. The bottom end of the first spring is fixedly connected to the top of the pressure plate. The pressure plate can be reset by setting the first spring.
[0010] As a further solution of the utility model, the rotating mechanism includes a first rack, which is fixedly connected to one side of the adjustment plate. The adjustment plate and the second gear are arranged to cooperate with each other. Through the arrangement of the first rack, the fourth screw rod can be rotated.
[0011] As a further scheme of the utility model, the upward movement mechanism includes a U-shaped plate, the U-shaped plate is fixedly connected to the bottom of the adjusting plate, one side of the U-shaped plate is fixedly connected to a second rack, the surface of the second rack is matched with a first gear, the first gear is rotatably connected to one side of the operating table, one side of the first gear is sleeved with a first worm, the surface of the first worm is matched with a first worm wheel, the top of the first worm wheel is sleeved with a rotating shaft, the rotating shaft is rotatably connected to the bottom of the operating table, the surface of the rotating shaft is sleeved with a second synchronous wheel, the surface of the second screw rod close to the second synchronous wheel is sleeved with the first synchronous wheel, the surfaces of the second synchronous wheel and the first synchronous wheel are sleeved with the same synchronous belt, the bottom of the support frame close to the second screw rod is fixedly connected to two second limit rods, the two second limit rods are both slidably connected to the top of the operating table, and the second screw rod can be moved upward by setting the first synchronous wheel.
[0012] As a further solution of the utility model, the adjustment mechanism includes two third limit rods, the two third limit rods are fixedly connected to one side of the first clamping plate, and the two third limit rods are slidably connected to one side of the limit column, and the limit column is rotatably connected to the surface of the side away from the first clamping plate with a second worm gear, the second worm gear is sleeved on the surface of the third screw rod, the second worm gear surface is matched with a second worm, and the second worm gear is rotatably connected to one side of the support frame, and the first clamping plate can be adjusted by setting the third screw rod.
[0013] The beneficial effects of the utility model are:
[0014] 1. The height of the splint can be adjusted by setting the second screw rod. The second screw rod is installed on the top of the first synchronous wheel. Since the height of the first synchronous wheel is constant, when the first synchronous wheel rotates, the second screw rod can be moved upward. A support frame is installed on the top of the second screw rod, and a splint is installed on one side of the support frame. When the support frame drives the splint to move upward, the splint can fix the steel structure from the middle.
[0015] 2. Through the setting of the fourth screw rod, the welding parts can be welded more comprehensively. The welding parts are set on the surface of the fourth screw rod through the slide plate. A second gear is installed on one side of the fourth screw rod, and the second gear cooperates with the rack on one side of the adjustment plate. As the adjustment plate continues to move downward, the fourth screw rod can be rotated, and through the rotation of the fourth screw rod, the welding parts can be moved, so that it can perform more comprehensive welding on the steel structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the overall structure of a steel structure welding bracket proposed by the utility model;
[0017] Figure 2 This is a schematic diagram of an adjustment mechanism of a steel structure welding bracket proposed by the utility model;
[0018] Figure 3 This is a schematic diagram of an upward movement mechanism of a steel structure welding bracket proposed by the utility model;
[0019] Figure 4 This is a schematic diagram of an adjustment mechanism of a steel structure welding bracket proposed by the utility model;
[0020] Figure 5 The utility model is a partial structural schematic diagram of a steel structure welding bracket.
[0021] In the figure: 1, operating table; 2, support frame; 3, first clamping plate; 4, frame; 101, column; 102, motor; 103, first screw rod; 104, adjustment plate; 105, first slide; 106, first limit rod; 107, limit plate; 108, first spring; 109, first rack; 110, pressure plate; 111, pulley; 112, U-shaped plate; 113, second rack; 201, second screw rod; 202, second limit rod; 203, first synchronous wheel; 204, synchronous Step belt; 205, rotating shaft; 206, first worm wheel; 207, second synchronous wheel; 208, first worm; 209, first gear; 301, second clamping plate; 302, third screw; 303, limiting column; 304, second worm wheel; 305, second worm; 306, third limiting rod; 401, second slide groove; 402, fourth screw; 403, fourth limiting rod; 404, slide plate; 405, second gear; 406, welding part; 407, top plate; 408, second spring. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0024] Reference Figure 1-Figure 5 A support for welding a steel structure comprises an operating table 1, a column 101 is fixedly connected to the top of the operating table 1, an adjusting plate 104 is slidably connected to one side of the column 101, a lifting mechanism for lifting the adjusting plate 104 is provided on the top of the column 101, a frame 4 is fixedly connected to the top of the operating table 1, two second slide grooves 401 are symmetrically provided on the top of the frame 4 near the adjusting plate 104, a fourth screw rod 402 and a fourth limit rod 403 are respectively provided inside the two second slide grooves 401, the fourth screw rod 402 is rotatably connected to one side of the second slide groove 401, the fourth limit rod 403 is fixedly connected to the inside of the second slide groove 401, the fourth screw rod 402 and the fourth limit rod 403 are sleeved with the same slide plate 404 on the surface, a welding piece 406 is slidably connected to the top of the slide plate 404, and an adjusting mechanism for adjusting the welding piece 406 is provided on the top of the welding piece 406 Structure, the fourth screw rod 402 is sleeved with a second gear 405 at the end portion near the column 101, and the surface of the second gear 405 is provided with a rotating mechanism for rotating the fourth screw rod 402, and two second screw rods 201 are symmetrically and slidably connected to the top of the operating table 1, and the tops of the two second screw rods 201 are fixedly connected to the support frame 2, and the surfaces of the two second screw rods 201 are provided with an upward mechanism for moving the support frame 2 upward, one side of one of the support frames 2 is fixedly connected to the second clamping plate 301, and one side of the other support frame 2 is provided with a limiting column 303, and one side of the limiting column 303 is sleeved with a third screw rod 302, and the surface of the third screw rod 302 near the second clamping plate 301 is fixedly connected to the first clamping plate 3, and the surface of the third screw rod 302 is provided with an adjustment mechanism for adjusting the first clamping plate 3, and the height of the clamping plate can be adjusted by the setting of the second screw rod 201.
[0025] Reference Figure 1 and Figure 2 In a preferred embodiment, the lifting mechanism includes a first screw rod 103, which is rotatably connected to the inside of the column 101, and a motor 102 is fixedly connected to the top of the first screw rod 103, and the motor 102 is fixedly connected to the top of the column 101. The adjustment plate 104 is sleeved on the surface of the first screw rod 103. Through the setting of the first screw rod 103, the adjustment plate 104 can be lifted and lowered.
[0026] Reference Figure 2 and Figure 5In a preferred embodiment, the adjustment mechanism includes a first slide groove 105, the first slide groove 105 is opened on one side of the adjustment plate 104, and two first limit rods 106 are symmetrically fixedly connected to the inner surface of the first slide groove 105. The surfaces of the two first limit rods 106 are slidably connected to the same pressure plate 110, and the bottom of the pressure plate 110 is rotatably connected to multiple pulleys 111, and the top of the welding piece 406 is fixedly connected to a top plate 407, and the multiple pulleys 111 all cooperate with the top plate 407. A second spring 408 is sleeved on the surface of the welding piece 406 close to the top plate 407, and the top end of the second spring 408 is fixedly connected to the bottom of the top plate 407, and the bottom end of the second spring 408 is fixedly connected to the top of the slide plate 404. The surfaces of the two first limit rods 106 are provided with a reset mechanism for resetting the pressure plate 110. By setting the pressure plate 110, the welding piece 406 can be adjusted.
[0027] Reference Figure 1 and Figure 2 In a preferred embodiment, the reset mechanism includes a limit plate 107, which is fixedly connected to the top of the first limit rod 106. The first limit rod 106 is sleeved with a first spring 108. The top end of the first spring 108 is fixedly connected to the bottom of the limit plate 107, and the bottom end of the first spring 108 is fixedly connected to the top of the pressure plate 110. By setting the first spring 108, the pressure plate 110 can be reset.
[0028] Reference Figure 2 and Figure 5 In a preferred embodiment, the rotating mechanism includes a first rack 109, which is fixedly connected to one side of the adjusting plate 104. The adjusting plate 104 and the second gear 405 are arranged to cooperate with each other. Through the arrangement of the first rack 109, the fourth screw rod 402 can be rotated.
[0029] Reference Figure 2 and Figure 3In a preferred embodiment, the upward movement mechanism includes a U-shaped plate 112, the U-shaped plate 112 is fixedly connected to the bottom of the adjustment plate 104, a second rack 113 is fixedly connected to one side of the U-shaped plate 112, a first gear 209 is matched on the surface of the second rack 113, the first gear 209 is rotatably connected to one side of the operating table 1, a first worm 208 is sleeved on one side of the first gear 209, a first worm gear 206 is matched on the surface of the first worm 208, a rotating shaft 205 is sleeved on the top of the first worm gear 206, and the rotating shaft 205 is rotatably connected to At the bottom of the operating table 1, the surface of the rotating shaft 205 is sleeved with a second synchronous wheel 207, the surface of the second screw rod 201 close to the second synchronous wheel 207 is sleeved with a first synchronous wheel 203, the surfaces of the second synchronous wheel 207 and the first synchronous wheel 203 are sleeved with the same synchronous belt 204, and the bottom of the support frame 2 close to the second screw rod 201 is fixedly connected with two second limit rods 202, and the two second limit rods 202 are both slidably connected to the top of the operating table 1. Through the setting of the first synchronous wheel 203, the second screw rod 201 can be moved upward.
[0030] Reference Figure 2 and Figure 4 In a preferred embodiment, the adjustment mechanism includes two third limit rods 306, the two third limit rods 306 are fixedly connected to one side of the first clamping plate 3, and the two third limit rods 306 are slidably connected to one side of the limit column 303, and the limit column 303 is rotatably connected to the surface of the side away from the first clamping plate 3 with a second worm gear 304, the second worm gear 304 is sleeved on the surface of the third screw rod 302, and the surface of the second worm gear 304 is matched with a second worm 305, and the second worm 305 is rotatably connected to one side of the support frame 2. By setting the third screw rod 302, the first clamping plate 3 can be adjusted.
[0031] From the above description, it can be seen that the above-mentioned embodiment of the utility model achieves the following technical effects: when it is necessary to weld a steel structure whose bottom is inconvenient to fix, the motor 102 can be started, and a first screw rod 103 is installed on the output shaft of the motor 102, so that when the motor 102 rotates, the first screw rod 103 can rotate synchronously, and an adjustment plate 104 is installed on one side of the first screw rod 103. Because the adjustment plate 104 slides inside the column 101, when the first screw rod 103 rotates, the adjustment plate 104 can be moved downward, and a The U-shaped plate 112 is provided so that the U-shaped plate 112 will move downward along with the adjusting plate 104. A second rack 113 is installed on one side of the U-shaped plate 112, and the second rack 113 cooperates with the first gear 209 on one side of the first worm 208, so that when the U-shaped plate 112 moves downward, the first worm 208 can be rotated. A first worm wheel 206 is cooperated on the surface of the first worm 208, and a synchronous belt 204 is installed on the top of the first worm wheel 206, and the synchronous belt 204 cooperates with the first synchronous wheel 203, so that when the first worm 208 drives the first worm wheel 206 When the first synchronous wheel 203 is rotated, the first synchronous wheel 203 can be rotated. A second screw rod 201 is installed on the top of the first synchronous wheel 203. Because the height of the first synchronous wheel 203 is constant, when the first synchronous wheel 203 is rotated, the second screw rod 201 can be moved up. A support frame 2 is installed on the top of the second screw rod 201, and a clamping plate is installed on one side of the support frame 2. When the support frame 2 drives the clamping plate to move up, the clamping plate can fix the steel structure from the middle. A pressing plate 110 is also installed on one side of the adjusting plate 104. When the steel structure is fixed, the pressing plate 110 is pressed. The plate 110 will press the welding part 406 so that the welding part 406 can weld the steel structure. The welding part 406 is mounted on the surface of the fourth screw rod 402 through the slide plate 404. A second gear 405 is installed on one side of the fourth screw rod 402, and the second gear 405 cooperates with the first rack 109 on one side of the adjustment plate 104. As the adjustment plate 104 continues to move downward, the fourth screw rod 402 can be rotated, and the rotation of the fourth screw rod 402 can move the welding part 406 so that it can weld the steel structure more comprehensively.
[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A steel structure welding support, comprising an operating table (1), characterized in that: The top of the operating table (1) is fixedly connected to a column (101), one side of the column (101) is slidably connected to an adjustment plate (104), and a lifting mechanism for lifting the adjustment plate (104) is provided on the top of the column (101). The top of the operating table (1) is fixedly connected to a frame (4), and two second slide grooves (401) are symmetrically provided on the top of the frame (4) near the adjustment plate (104), and a fourth screw rod (402) and a fourth limit rod (403) are respectively provided inside the two second slide grooves (401), and the fourth screw rod (402) is rotatably connected to one side of the second slide groove (401), and the fourth limit rod (403) is fixedly connected to the inside of the second slide groove (401), and the surfaces of the fourth screw rod (402) and the fourth limit rod (403) are sleeved with the same slide plate (404), and the top of the slide plate (404) is slidably connected to a welding piece (406), and the top of the welding piece (406) is provided with a 06) adjustment mechanism, the fourth screw rod (402) is sleeved with a second gear (405) at the end near the column (101), and the surface of the second gear (405) is provided with a rotating mechanism for rotating the fourth screw rod (402), the top of the operating table (1) is symmetrically and slidably connected with two second screw rods (201), the tops of the two second screw rods (201) are fixedly connected with a support frame (2), and the surfaces of the two second screw rods (201) are provided with an upward movement mechanism for moving the support frame (2) upward, one side of the support frame (2) is fixedly connected with a second clamping plate (301), and the other side of the support frame (2) is provided with a limiting column (303), and one side of the limiting column (303) is sleeved with a third screw rod (302), the surface of the third screw rod (302) near the second clamping plate (301) is fixedly connected with the first clamping plate (3), and the surface of the third screw rod (302) is provided with an adjustment mechanism for adjusting the first clamping plate (3).
2. The steel structure welding bracket according to claim 1, characterized in that: The lifting mechanism comprises a first screw rod (103), the first screw rod (103) is rotatably connected to the inside of the column (101), the top of the first screw rod (103) is fixedly connected to a motor (102), the motor (102) is fixedly connected to the top of the column (101), and the adjustment plate (104) is sleeved on the surface of the first screw rod (103).
3. The steel structure welding bracket according to claim 2, characterized in that: The adjustment mechanism comprises a first slide groove (105), wherein the first slide groove (105) is opened on one side of the adjustment plate (104), and two first limit rods (106) are symmetrically fixedly connected to the inner surface of the first slide groove (105), and the surfaces of the two first limit rods (106) are slidably connected to the same pressure plate (110), and the bottom of the pressure plate (110) is rotatably connected to a plurality of pulleys (111), and the top of the welding part (406) is fixedly connected to a top plate (407), and the plurality of pulleys (111) are mutually matched with the top plate (407), and a second spring (408) is sleeved on the surface of one side of the welding part (406) close to the top plate (407), and the top end of the second spring (408) is fixedly connected to the bottom of the top plate (407), and the bottom end of the second spring (408) is fixedly connected to the top of the slide plate (404), and the surfaces of the two first limit rods (106) are provided with a reset mechanism for resetting the pressure plate (110).
4. The steel structure welding bracket according to claim 3, characterized in that: The reset mechanism comprises a limit plate (107), wherein the limit plate (107) is fixedly connected to the top of a first limit rod (106), a first spring (108) is sleeved on the surface of the first limit rod (106), the top end of the first spring (108) is fixedly connected to the bottom of the limit plate (107), and the bottom end of the first spring (108) is fixedly connected to the top of a pressure plate (110).
5. The steel structure welding bracket according to claim 4, characterized in that: The rotating mechanism comprises a first rack (109), the first rack (109) is fixedly connected to one side of the adjustment plate (104), and the adjustment plate (104) and the second gear (405) are arranged in cooperation with each other.
6. The steel structure welding bracket according to claim 5, characterized in that: The upward movement mechanism comprises a U-shaped plate (112), wherein the U-shaped plate (112) is fixedly connected to the bottom of the adjustment plate (104), a second rack (113) is fixedly connected to one side of the U-shaped plate (112), a first gear (209) is matched on the surface of the second rack (113), the first gear (209) is rotatably connected to one side of the operating table (1), a first worm (208) is sleeved on one side of the first gear (209), a first worm wheel (206) is matched on the surface of the first worm (208), and a rotating shaft (205) is sleeved on the top of the first worm wheel (206), The rotating shaft (205) is rotatably connected to the bottom of the operating table (1); a second synchronous wheel (207) is sleeved on the surface of the rotating shaft (205); a first synchronous wheel (203) is sleeved on the surface of the second screw rod (201) close to the second synchronous wheel (207); the surfaces of the second synchronous wheel (207) and the first synchronous wheel (203) are sleeved with the same synchronous belt (204); two second limiting rods (202) are fixedly connected to the bottom of the support frame (2) close to the second screw rod (201); and the two second limiting rods (202) are slidably connected to the top of the operating table (1).
7. The steel structure welding bracket according to claim 6, characterized in that: The adjustment mechanism comprises two third limit rods (306), the two third limit rods (306) are fixedly connected to one side of the first clamping plate (3), and the two third limit rods (306) are slidably connected to one side of the limit column (303), and the surface of the limit column (303) away from the first clamping plate (3) is rotatably connected to a second worm gear (304), the second worm gear (304) is sleeved on the surface of the third screw rod (302), the surface of the second worm gear (304) is matched with a second worm (305), and the second worm (305) is rotatably connected to one side of the support frame (2).