CN219151639U

CN219151639U - Welding spot dismantling device

Info

Publication number: CN219151639U
Application number: CN202320043599.1U
Authority: CN
Inventors: 刘辉; 刘杰; 尹子平
Original assignee: GAC Honda Automobile Co Ltd; Guangqi Honda Automobile Research and Development Co Ltd
Current assignee: GAC Honda Automobile Co Ltd; Guangqi Honda Automobile Research and Development Co Ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-06-09
Anticipated expiration: 2033-01-03

Abstract

The utility model discloses a welding spot dismantling device, which comprises: the feeding mechanism comprises an angle adjusting assembly and a linear feeding assembly, the angle adjusting assembly comprises a first connecting seat and a second connecting seat, the first connecting seat is connected with the second connecting seat through a rotating shaft component, the rotating shaft component is used for limiting the rotating axis of the second connecting seat on the first connecting seat, the linear feeding assembly comprises a first gear, a handle and an electric drill connecting rod, the second connecting seat is provided with a first guide hole, the electric drill connecting rod is arranged in the first guide hole in a floating mode, the first gear is arranged on the second connecting seat and connected with the handle, and a first transmission tooth matched with the first gear is arranged along the length direction of the electric drill connecting rod; and the electric drill is arranged on the electric drill connecting rod. The welding spot removing device is labor-saving and efficiency-improving through mechanical device operation, can prevent safety accidents from being directly relieved by operators, and can be used for removing welding spots in different areas corresponding to the bottom of a vehicle body.

Description

Welding spot dismantling device

Technical Field

The utility model is used in the field of automobile manufacturing, and particularly relates to a welding spot dismantling device.

Background

The existing automobile body is mainly formed by welding metal plates, in order to improve the rust resistance of the automobile body, the automobile body is required to be subjected to coating process treatment, the automobile body passes through a specific coating electrophoresis tank, and a layer of electrophoresis paint film is attached to the inner surface and the outer surface of the automobile body, so that the rust resistance is achieved.

Because each pillar on the frame is the cavity structure that forms by the panel beating, in the frame electrophoresis in-process, the surface panel beating obtains good lacquer film thickness more easily, and the inner structure of cavity is then next. The smaller the cavity gap is, the more difficult the electrophoresis is, and the more difficult the quality of a paint film is ensured.

Because of the lack of a special device for measuring the coating film thickness, when the thickness of the electrophoretic paint film in the inner cavity of the vehicle body is monitored, the vehicle in each batch needs to be subjected to spot check, the bottom, side wall and other parts of the spot check vehicle are subjected to destructive disassembly, and then the film thickness of the paint film on the metal plate in the cavity is measured.

The prior art is that pure manual operation electric drill or some simple and easy instrument centre gripping electric drill carry out the solder joint and demolish, and prior art has following not enough:

1. the welding spots are manually dismantled by hands, so that the labor is wasted, the efficiency is low, and safety accidents are easy to occur when the personnel are tired;

2. the existing tool has limited use positions and cannot be dismantled corresponding to welding spots at the bottom of the automobile body.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art, and provides a welding spot dismantling device which is operated by a mechanical device, saves labor, improves efficiency, avoids safety accidents caused by direct relief of operators, and can be used for dismantling welding spots in different areas corresponding to the bottom of a vehicle body.

The technical scheme adopted for solving the technical problems is as follows:

a solder joint removal apparatus comprising:

the feeding mechanism comprises an angle adjusting assembly and a linear feeding assembly, the angle adjusting assembly comprises a first connecting seat and a second connecting seat, the first connecting seat is connected with the second connecting seat through a rotating shaft component, the rotating shaft component is used for limiting the rotating axis of the second connecting seat on the first connecting seat, the linear feeding assembly comprises a first gear, a handle and an electric drill connecting rod, the second connecting seat is provided with a first guide hole, the electric drill connecting rod is arranged in the first guide hole in a floating mode, the first gear is arranged on the second connecting seat and connected with the handle, and a first transmission tooth matched with the first gear is arranged along the length direction of the electric drill connecting rod;

and the electric drill is arranged on the electric drill connecting rod.

In combination with the above implementation manner, in some implementation manners, a cavity is provided on the back side of the second connecting seat, the first gear is disposed in the cavity, the electric drill connecting rod passes through the cavity through the first guiding hole and is matched with the first gear through the first transmission gear, and an elastic reset component for driving the electric drill connecting rod to reset automatically after the handle is loosened is disposed in the cavity.

In combination with the above implementation, in some implementations, the elastic restoring member includes a spring piece, one end of the spring piece is connected to the cavity, and the other end is connected to the first gear.

In combination with the above implementation manner, in some implementation manners, the first connecting seat is provided with an arc groove taking the rotation axis as a center of a circle, the second connecting seat is provided with a first threaded hole at a position corresponding to the arc groove, and the second connecting seat further comprises a first locking bolt used for locking the first connecting seat and the second connecting seat, and the first locking bolt penetrates through the arc groove to be locked into the first threaded hole.

In combination with the above implementation manner, in some implementation manners, a first shaft hole is formed in the center of the first connecting seat, the rotating shaft component is rotatably installed in the first shaft hole, the second connecting seat is fixedly connected with the end portion of the rotating shaft component, a first boss is arranged on the first connecting seat, a second threaded hole is formed in the first boss, and a second locking bolt used for propping against the rotating shaft component to enable the rotating shaft component to be unable to rotate is arranged in the second threaded hole.

In combination with the above implementation manner, in some implementation manners, the second connecting seat is provided with a groove sinking along the axial direction on one side of the first connecting seat, the first connecting seat is provided with a second boss extending into the groove along the axial direction on one side of the second connecting seat, a radial groove is formed in the second boss, a spring is arranged in the radial groove, a ball is arranged at the top of the spring, an outer opening of the radial groove is formed in the top of the spring, so that a part of spherical surface of the ball can exceed the outer peripheral surface of the second boss under the extrusion of the spring, and a plurality of ball limiting grooves arranged along the circumferential direction are formed in the positions of the inner wall surface of the groove, which are matched with the ball.

In combination with the above implementation manner, in some implementation manners, the device further comprises a supporting rod, the first connecting seat is provided with a second shaft hole, the second shaft hole and the first shaft hole form a certain included angle, the second shaft hole of the first connecting seat penetrates through the top end of the supporting rod and is placed on the supporting end face of the supporting rod, and the first connecting seat can rotate by taking the supporting rod as an axis.

In combination with the above implementation manner, in some implementation manners, a third boss is provided on the first connection seat, a third threaded hole is provided on the third boss, and an adjusting rod for propping against the supporting rod so that the first connection seat cannot rotate around the supporting rod is provided in the third threaded hole.

In combination with the above implementation manner, in some implementation manners, the device further comprises a support frame, a second guide hole is formed in the support frame, the support rod is arranged in the second guide hole, and a driving assembly for driving the support rod to lift along the second guide hole is arranged on the support frame.

In combination with the above implementation manner, in some implementation manners, the middle part of the supporting frame is provided with the middle supporting plate, the top surfaces of the middle supporting plate and the supporting frame are provided with coaxial second guide holes, the supporting rod is assembled in the second guide holes, the middle supporting plate is provided with a locking mechanism for locking the supporting rod, the driving assembly comprises a hand wheel, the hand wheel is connected with a second gear through a connecting rod, and second transmission teeth matched with the second gear are arranged along the length direction of the supporting rod.

One of the above technical solutions has at least one of the following advantages or beneficial effects: according to the welding spot dismantling device in the technical scheme, the electric drill performs angle adjustment and linear feeding through the feeding mechanism, wherein the linear feeding is realized by the linear feeding assembly, namely, when the handle is pushed along the feeding direction, the first gear is driven to rotate, and meanwhile, the first gear is in transmission fit with the first transmission gear to drive the electric drill connecting rod to move upwards, so that the electric drill drills through the welding spot. When the handle is pushed in the opposite direction, the gear is driven to rotate reversely, the electric drill connecting rod is driven to move downwards, the electric drill is separated from the vehicle body, and the original position is restored. The angle adjustment is realized by angle adjustment subassembly, and first connecting seat and second connecting seat are connected through pivot part, and pivot part defines the axis of rotation of second connecting seat on first connecting seat, and during the use, accessible operation second connecting seat revolute pivot part and rotate, alright realize electric drill angle adjustment. According to the technical scheme, the mechanical device is used for operation, labor is saved, efficiency is improved, safety accidents are avoided when operators are directly relieved, and welding spots in different areas corresponding to the bottom of the automobile body can be removed by arranging the feeding mechanism.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of one embodiment of the present utility model;

figure 2 is a schematic view of the feed mechanism and drill configuration of one embodiment shown in figure 1;

FIG. 3 is a schematic view of an exploded view of the feed mechanism of one embodiment shown in FIG. 1 from a first perspective;

FIG. 4 is a schematic view of an exploded view of the feed mechanism of one embodiment shown in FIG. 1 from a second perspective;

FIG. 5 is a schematic view of the spring plate structure of one embodiment shown in FIG. 1;

FIG. 6 is a schematic diagram of the drive assembly of one embodiment shown in FIG. 1.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the present utility model, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present utility model, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present utility model, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the present utility model, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.

In which fig. 1 shows reference directions of an embodiment of the present utility model, the embodiment of the present utility model will be described below with reference to the directions shown in fig. 1.

The embodiment of the utility model provides a welding spot removing device which can be used for removing welding spots at the bottom of a white car body.

Referring to fig. 1, 2, 3 and 4, the welding spot removing device includes a feeding mechanism 100 and an electric drill 200, wherein the electric drill 200 is mounted on the feeding mechanism 100, and the angle and position of the electric drill 200 are adjusted by the feeding mechanism 100, so as to expand the operation range of the electric drill 200 at the bottom of a vehicle body.

The feeding mechanism 100 comprises an angle adjusting assembly and a linear feeding assembly, the angle adjusting assembly comprises a first connecting seat 101 and a second connecting seat 102, the first connecting seat 101 and the second connecting seat 102 are connected through a rotating shaft part 103, and the rotating shaft part 103 defines a rotating axis of the second connecting seat 102 on the first connecting seat 101. The linear feeding assembly comprises a first gear 104, a handle 105 and an electric drill connecting rod 106, wherein the second connecting seat 102 is provided with a first guide hole, the electric drill connecting rod 106 is floatingly arranged in the first guide hole, the first gear 104 is arranged on the second connecting seat 102 and connected with the handle 105, and first transmission teeth 107 matched with the first gear 104 are arranged along the length direction of the electric drill connecting rod 106. The drill 200 is mounted to the drill link 106.

The feeding mechanism 100 is provided with a handle 105, the handle 105 is pushed, the up and down of the electric drill 200 can be adjusted, the feeding mechanism 100 can also adjust the angle in a certain range, the drill bit of the electric drill 200 is moved to a proper position through the integral device and the position and the angle change of the electric drill 200, and then the handle 105 is pushed, the electric drill 200 is moved upwards, so that welding spots at the bottom of a vehicle body are removed.

Referring to fig. 1, fig. 2, fig. 3, and fig. 4, in the welding spot removing device according to the present utility model, the electric drill 200 performs angle adjustment and linear feeding through the feeding mechanism 100, wherein the linear feeding is implemented by a linear feeding assembly, that is, when the handle 105 is pushed along the feeding direction, the first gear 104 is driven to rotate, and meanwhile, the first gear 104 is in transmission fit with the first transmission gear 107 to drive the electric drill connecting rod 106 to move upwards, so that the electric drill 200 drills through the welding spot. When the handle 105 is pushed in the opposite direction, the gear is driven to rotate reversely, the electric drill connecting rod 106 is driven to move downwards, and the electric drill 200 is separated from the vehicle body to restore the original position. The angle adjustment is realized by angle adjustment subassembly, and first connecting seat 101 and second connecting seat 102 are connected through pivot part 103, and pivot part 103 defines the axis of rotation of second connecting seat 102 on first connecting seat 101, and during the use, accessible operation second connecting seat 102 revolute pivot part 103 and rotate, alright realize electric drill 200 angle adjustment. According to the technical scheme, the mechanical device is used for operation, labor is saved, efficiency is improved, safety accidents are avoided when operators are directly relieved, and welding spots in different areas corresponding to the bottom of a vehicle body can be removed by arranging the feeding mechanism 100.

Referring to fig. 4, the electric drill 200 is mounted on a bracket 201, a fastening bolt is arranged on the bracket 201, and the electric drill 200 can be adjusted and replaced by tightening the fastening bolt.

In some embodiments, referring to fig. 3, 4 and 5, the back side of the second connecting seat 102 is provided with a cavity 108, the cavity 108 is integrally connected with the second connecting seat 102, the cavity 108 is provided with a cover plate 109, the first gear 104 is disposed in the cavity 108, and the center of the first gear 104 is provided with a kidney-shaped hole and is connected with the handle 105 through the kidney-shaped hole. The electric drill connecting rod 106 passes through the cavity 108 through the first guide hole and is matched with the first gear 104 through the first transmission tooth 107, and an elastic reset component for driving the electric drill connecting rod 106 to reset automatically after the handle 105 is loosened is arranged in the cavity 108. When the handle 105 is pushed upwards, the first gear 104 is driven to rotate upwards, meanwhile, the elastic reset part stores force, the first gear 104 drives the electric drill connecting rod 106 to move upwards, after a welding spot is drilled through, the handle 105 is loosened, the elastic reset part in shrinkage is restored to a natural state, so that the first gear 104 is driven to rotate reversely, the electric drill connecting rod 106 is driven to move downwards, the electric drill 200 is separated from a vehicle body, and the original position is restored.

The elastic restoring member may be a spring or a spring plate, for example, in some embodiments, referring to fig. 5, the elastic restoring member includes a spring plate 110, where one end of the spring plate 110 is connected to the cavity 108, and the other end is connected to the gear.

In some embodiments, referring to fig. 2 and 3, the first connecting seat 101 is provided with a circular arc groove 111 taking the rotation axis as the center, the second connecting seat 102 is provided with a first threaded hole 112 at a position corresponding to the circular arc groove 111, and the first locking bolt 113 for locking the first connecting seat 101 and the second connecting seat 102 is further included, and the first locking bolt 113 is locked into the first threaded hole 112 through the circular arc groove 111. When the first locking bolt 113 is tightened, the first and

second connection sockets

101 and 102 are locked, and the electric drill 200 is limited to a specific angle. When the first lock bolt 113 is unscrewed, the drill 200 can be turned.

Further, referring to fig. 3 and 4, a first shaft hole is formed in the center of the first connecting seat 101, the rotating shaft member 103 is rotatably mounted in the first shaft hole, and the second connecting seat 102 is fixedly connected with an end portion of the rotating shaft member 103. Wherein, pivot part 103 sets up to waist formula with second connecting seat 102 cooperation end, and second connecting seat 102 center department cooperation pivot part 103 is equipped with the hole, and pivot part 103 can insert in this hole, and the center of pivot part 103 is equipped with screw hole 114, and second connecting seat 102 is equipped with bolt 115 and can passes second connecting seat 102 and install in the screw hole for first connecting seat 101 leaves the surplus with second connecting seat 102 fitting surface for after the bolt is screwed up, second connecting seat 102 can rotate along the central axis with first connecting seat 101.

As the locking of the single bolt should be against the impact when the welding spot is removed, loosening may occur, referring to fig. 2 and 3, the first connection seat 101 is provided with a first boss 116, the first boss 116 is provided with a second threaded hole, and the second threaded hole is provided with a second locking bolt 117 for abutting against the rotating shaft part 103 so that the rotating shaft part 103 cannot rotate. When the second locking bolt 117 is tightened, its end face close to the thread abuts against the cylindrical surface of the rotating shaft member 103, locking the rotating shaft member 103 against rotation. By controlling the angular adjustment of the feed mechanism 100 by tightening or loosening the first lock bolt 113 and the second lock bolt 117, the impact resistance is better and looseness is avoided.

The angle adjustment range can be set through the length of the arc groove 111, and when the first locking bolt 113 and the second locking bolt 117 are loosened, the whole mechanism is not well controlled in adjustment due to the gravity effect, and the operation is not friendly. Referring to fig. 3 and 4, the second connecting seat 102 is provided with a recess 118 sinking along the axial direction on one side facing the first connecting seat 101, the first connecting seat 101 is provided with a second boss 119 extending into the recess 118 along the axial direction on one side facing the second connecting seat 102, the second boss 119 is provided with a radial groove, a spring 120 is arranged in the radial groove, the top of the spring 120 is provided with a ball 121, the outer side of the radial groove is opened, a part of spherical surface of the ball 121 can exceed the outer peripheral surface of the second boss 119 under the extrusion of the spring 120, and a plurality of ball limiting grooves 122 arranged along the circumferential direction are arranged on the inner wall surface of the recess 118 at positions matched with the ball 121. When the angle is adjusted, the balls 121 jump among the ball limiting grooves 122, and the whole mechanism can be changed by taking 1 degree as a unit, so that the whole mechanism is better controlled during adjustment, and the operation is more friendly.

In some embodiments, referring to fig. 2 and 3, the electric drill further includes a support rod 300, the first connecting seat 101 is provided with a second shaft hole 123, the second shaft hole 123 and the first shaft hole form a certain included angle, the second shaft hole 123 of the first connecting seat 101 passes through the top end of the support rod 300 and is placed on the support end surface 301 of the support rod 300, and the first connecting seat 101 can rotate with the support rod 300 as an axis, so that the working range of the electric drill 200 is further increased, a larger area of the vehicle bottom is covered, and welding spots corresponding to different areas of the vehicle bottom are removed.

Further, referring to fig. 2 and 3, a third boss 124 is disposed on the first connecting seat 101, a third threaded hole 125 is disposed on the third boss 124, and an adjusting rod 126 for abutting against the supporting rod 300 so that the first connecting seat 101 cannot rotate around the supporting rod 300 is disposed in the third threaded hole 125. The adjusting lever 126 is used for controlling the first connecting seat 101 to rotate around the axis of the supporting rod 300 or to lock, when the adjusting lever 126 is unscrewed, the first connecting seat 101 can rotate, when the adjusting lever 126 is screwed down, the first connecting seat 101 is locked, and in the locked state, the electric drill 200 can dismantle welding spots in the underbody area.

In some embodiments, referring to fig. 1, the device further includes a support frame 302, the support frame 302 is provided with a base 303, the base 303 is welded with the support frame 302 into a whole, a second guide hole is formed in the support frame 302, the support rod 300 is disposed in the second guide hole, and a driving component for driving the support rod 300 to lift along the second guide hole is disposed on the support frame 302. The electric drill 200 is moved to a target position by controlling the up-and-down movement of the support bar 300 by the driving assembly.

The driving assembly may adopt an air cylinder, an electric push rod, etc., in some embodiments, referring to fig. 1 and 6, the middle part of the supporting frame 302 is provided with a middle supporting plate 304, the top surfaces of the middle supporting plate 304 and the supporting frame 302 are provided with coaxial second guiding holes, the supporting rod 300 is assembled in the second guiding holes, the middle supporting plate 304 is provided with a locking mechanism 305 for locking the supporting rod 300, the driving assembly comprises a hand wheel 306, the hand wheel 306 is connected with a second gear 307 through a connecting rod, and second transmission teeth 308 matched with the second gear 307 are arranged along the length direction of the supporting rod 300. When the locking mechanism 305 is released, the rotation of the hand wheel 306 drives the connecting rod and the second gear 307 to rotate, so that the supporting rod 300 is controlled to move up and down to the target position, and then the locking mechanism 305 is locked.

In the description of the present specification, reference to the terms "example," "embodiment," or "some embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present utility model is, of course, not limited to the above-described embodiments, and one skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and these equivalent modifications or substitutions are intended to be included in the scope of the present utility model as defined in the claims.

Claims

1. A solder joint removing apparatus, comprising:

and the electric drill is arranged on the electric drill connecting rod.

2. The welding spot removing device according to claim 1, wherein a cavity is formed in the back side of the second connecting seat, the first gear is arranged in the cavity, the electric drill connecting rod passes through the cavity through the first guide hole and is matched with the first gear through the first transmission gear, and an elastic reset part for driving the electric drill connecting rod to reset automatically after the handle is loosened is arranged in the cavity.

3. The spot weld removing apparatus according to claim 2, wherein the elastic restoring member includes a spring piece having one end connected to the cavity and the other end connected to the first gear.

4. The welding spot removing device according to claim 1, wherein the first connecting seat is provided with an arc groove taking the rotation axis as a center, the second connecting seat is provided with a first threaded hole at a position corresponding to the arc groove, and the welding spot removing device further comprises a first locking bolt for locking the first connecting seat and the second connecting seat, and the first locking bolt penetrates through the arc groove and is locked into the first threaded hole.

5. The welding spot removing device according to claim 4, wherein a first shaft hole is formed in the center of the first connecting seat, the rotating shaft component is rotatably mounted in the first shaft hole, the second connecting seat is fixedly connected with the end portion of the rotating shaft component, a first boss is arranged on the first connecting seat, a second threaded hole is formed in the first boss, and a second locking bolt for supporting the rotating shaft component to enable the rotating shaft component to be unable to rotate is arranged in the second threaded hole.

6. The welding spot removing device according to claim 1, wherein the second connecting seat is provided with a groove sinking along the axial direction on one side facing the first connecting seat, the first connecting seat is provided with a second boss extending into the groove along the axial direction on one side facing the second connecting seat, the second boss is provided with a radial groove, a spring is arranged in the radial groove, the top of the spring is provided with a ball, the outer side of the radial groove is opened, the partial spherical surface of the ball can exceed the outer circumferential surface of the second boss under the extrusion of the spring, and the inner wall surface of the groove is provided with a plurality of ball limiting grooves which are arranged along the circumferential direction at the position matched with the ball.

7. The welding spot removing device according to claim 5, further comprising a support rod, wherein the first connecting seat is provided with a second shaft hole, the second shaft hole and the first shaft hole form a certain included angle, the second shaft hole of the first connecting seat penetrates through the top end of the support rod and is placed on the support end face of the support rod, and the first connecting seat can rotate with the support rod as an axis.

8. The welding spot removing device according to claim 7, wherein a third boss is provided on the first connecting seat, a third threaded hole is provided on the third boss, and an adjusting lever for abutting against the supporting rod so that the first connecting seat cannot rotate around the supporting rod is provided in the third threaded hole.

9. The welding spot removing device according to claim 7, further comprising a support frame, wherein a second guide hole is formed in the support frame, the support rod is arranged in the second guide hole, and a driving assembly for driving the support rod to lift along the second guide hole is arranged on the support frame.

10. The welding spot removing device according to claim 9, wherein an intermediate support plate is arranged in the middle of the support frame, coaxial second guide holes are formed in the intermediate support plate and the top surface of the support frame, the support rod is assembled in the second guide holes, a locking mechanism for locking the support rod is arranged on the intermediate support plate, the driving assembly comprises a hand wheel, the hand wheel is connected with a second gear through a connecting rod, and second transmission teeth matched with the second gear are arranged along the length direction of the support rod.