Building steel structure cutting and welding integrated device

Abstract

The invention discloses a building steel structure cutting and welding integrated device, and relates to the technical field of steel structure cutting and welding integrated machining. Comprising a cutting mechanism used for cutting steel pipes so that the end faces of the two steel pipes can be flush; the grinding mechanism is used for grinding the end face of the cut steel pipe and the annular outer side wall of the end face; the butt joint mechanism is used for carrying out butt joint on the end parts of the two polished steel pipes; and the welding mechanism is used for welding and connecting the end parts of the two butted steel pipes. By arranging the cutting mechanism, the grinding mechanism, the butt joint mechanism and the welding mechanism, the end faces of the two steel pipes can be matched, the final welding quality is guaranteed, the whole process is automatically operated, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure cutting and welding integrated processing, and particularly relates to a building steel structure cutting and welding integrated device. BACKGROUND

[0002] Steel structure, as one of the main building structure types, is composed of beams, columns, trusses and other components made of profile steel and steel plates, and has the advantages of light weight, simple construction, high industrialization degree, etc., and is widely used in large workshops, venues and super high-rise building fields. The components are usually connected by welding, bolts or rivets, and the welding quality is directly related to the safety of the structure.

[0003] At present, steel structure processing is facing many challenges. There is a shortage of welders in the industry, and the labor cost is high. In addition, the automation degree of steel structure manufacturing is low, which makes it difficult to guarantee the welding quality and efficiency, and the material waste is large. In the field of building steel structure, the characteristics of non-standard design, variety of components, small batch production of single components and complex process are prominent. In addition, the cutting and welding of steel structure in the prior art are usually carried out by separate equipment. For example, when a tie rod production enterprise needs to produce components of different lengths according to demand, manual tape measuring, line drawing, plasma cutting and manual butt welding are usually adopted. This mode is not only complicated to operate, occupies a large area, has high equipment investment, and has slow cutting speed and uneven cutting, which increases the difficulty of subsequent welding.

[0004] Specifically, for steel pipe connection, the traditional method has obvious limitations. The end face of the cut steel pipe is often not flat, resulting in a gap when butt jointed, making it difficult for the welding material to adhere, and affecting the connection strength. The polishing process is usually operated independently, and needs to be repeatedly clamped, and the positioning error will reduce the butt joint accuracy. The whole process involves multiple processes such as cutting, polishing, butt jointing and welding. If there is no integrated device, the production efficiency will be low, and it is difficult to ensure the consistency of the quality of the finished product.

[0005] Specifically, for steel pipe connection, the traditional method has obvious limitations. The end face of the cut steel pipe is often not flat, resulting in a gap when butt jointed, making it difficult for the welding material to adhere, and affecting the connection strength. The polishing process is usually operated independently, and needs to be repeatedly clamped, and the positioning error will reduce the butt joint accuracy. The whole process involves multiple processes such as cutting, polishing, butt jointing and welding. If there is no integrated device, the production efficiency will be low, and it is difficult to ensure the consistency of the quality of the finished product. SUMMARY

[0006] The purpose of the present application is to solve the problems existing in the prior art, and to provide a building steel structure cutting and welding integrated device.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A building steel structure cutting and welding integrated device, comprising: a cutting mechanism for cutting steel pipes so that the end faces of two steel pipes are flush; a polishing mechanism for polishing the end faces of the cut steel pipes and the annular outer side wall of the end faces; A docking mechanism for docking two ends of two polished steel pipes; A welding mechanism for welding the two ends of the two steel pipes.

[0008] As a preferred embodiment of the present application, the welding mechanism comprises a mounting frame, an electric telescopic base mounted on the mounting frame, a welding assembly mounted at the bottom end of the electric telescopic base, and the electric telescopic base is used to control the height of the welding assembly, and the docking position of the two steel pipes is located directly below the welding assembly.

[0009] As a preferred embodiment of the present application, the cutting mechanism comprises a cutting support base, a cutting saw blade rotatably mounted on the cutting support base through a shaft, and a cutting control motor mounted on one side of the cutting support base for controlling the rotation of the cutting saw blade.

[0010] As a preferred embodiment of the present application, the cutting mechanism further comprises a cutting base, the cutting support base slides in the inner wall of the cutting base, and a cutting movement control assembly is mounted on the cutting base for controlling the translational sliding of the cutting support base in the cutting base.

[0011] As a preferred embodiment of the present application, the polishing mechanism comprises: A stand, a rotating drum rotatably mounted on the stand, and a rotation control portion mounted on the stand for controlling the rotation of the rotating drum; A slide column mounted on the rotating drum, one end of the slide column is provided with a mounting disc, the mounting disc is provided with a plurality of circumferentially distributed first polishing pieces and second polishing pieces, the first polishing pieces and the second polishing pieces are alternately arranged, the first polishing pieces are used for polishing the end face of the steel pipe, and the second polishing pieces are used for polishing the side face of the end of the steel pipe.

[0012] As a preferred embodiment of the present application, the first polishing piece is a first polishing plate, a plurality of circumferentially distributed strip-shaped mounting grooves are formed in the mounting disc, the first polishing plate is detachably mounted in the strip-shaped mounting groove, and when the first polishing plate is mounted in the strip-shaped mounting groove, the polishing surface of the first polishing plate protrudes out of the outer wall of the mounting disc.

[0013] As a preferred embodiment of the present application, the slide column is connected to the inner wall of the end of the rotating drum in a relative sliding but non-rotating manner, the mounting disc and the rotating drum are connected through a first spring, the second polishing piece comprises a movable frame, a plurality of circumferentially distributed strip-shaped cavities are formed in the mounting disc, one end of the movable frame slides in the strip-shaped cavity, the end of the movable frame and the inner wall of the strip-shaped cavity are connected through a second spring, the other end of the movable frame extends to the outside of the strip-shaped cavity and is fixed with a second polishing plate, each second polishing plate is circumferentially distributed about the center of rotation of the mounting disc, and a ball head rod is fixed on the movable frame; a guide cover is fixed on the stand, the inner diameter of the guide cover gradually increases away from the stand, and an annular inclined surface on the inner side of the guide cover is located on the movement path of the ball head rod.

[0014] As a preferred of the present application: the rotating control part comprises a second rotating control motor, the second rotating control motor is fixed on the stand, the output end of the second rotating control motor is connected with a second rotating control gear, the outer side of the rotating drum is provided with circumferentially distributed second protrusions, and the second protrusions are meshed with the second rotating control gear.

[0015] As a preferred of the present application: the docking mechanism comprises a position control assembly and a clamping assembly, the clamping assembly comprises an annular support seat, the annular support seat is installed on the position control assembly, the annular support seat is rotatably installed with an annular rotating seat, the outer side of the annular rotating seat is fixed with circumferentially distributed electric clamping cylinders, the output end of the electric clamping cylinder penetrates through the annular rotating seat and is connected with a clamping plate, one side of the annular support seat is fixed with a support plate, the support plate is installed with a first rotating control motor, the output end of the first rotating control motor is installed with a first rotating control gear, the outer side of the annular rotating seat is provided with circumferentially distributed first protrusions, and the first rotating control gear is meshed with the first protrusions.

[0016] As a preferred of the present application: the position control assembly comprises a transverse moving base frame, the transverse moving base frame is slidably connected with a transverse moving seat, the transverse moving base frame is installed with a transverse moving control assembly for controlling the sliding translation of the transverse moving seat, the bottom of the transverse moving seat is fixed with a docking slide rail, the docking slide rail is slidably connected with moving seats, the docking slide rail is installed with a docking moving control assembly for controlling the movement of the two moving seats, one side of the moving seat is installed with an electric telescopic cylinder, and the output end of the electric telescopic cylinder is fixed on the annular support seat.

[0017] The present application has the following advantages: 1. The present application sets cutting mechanism, polishing mechanism, docking mechanism and welding mechanism, which can ensure the end face adaptation of two steel pipes, guarantee the final welding quality, and the whole process is automatic operation, which improves the processing efficiency.

[0018] 2. The present application sets polishing mechanism, which can tightly attach one end of the steel pipe to the first polishing piece, tightly attach the outer wall of the steel pipe to the second polishing piece, drive the mounting disc to rotate based on the rotation of the rotating drum, and then polish the steel pipe by the first polishing piece and the second polishing piece, so that the two steel pipes are more closely when docking, the solder is more easily attached, and the welding quality is guaranteed.

[0019] 3. The present application sets first polishing piece and second polishing piece, which can press the first polishing piece by the end of the steel pipe and push the slide column into the rotating drum during polishing, the guide cover limits and extrudes the ball head rod, so that each second polishing piece tightly attaches to the outer wall of the end of the steel pipe, the mounting disc rotates when the rotating drum rotates, and the synchronous polishing of the end face and the side wall of the end face of the steel pipe is realized; the structure can adapt to steel pipes of different sizes and does not need additional power source for adjustment.

[0020] 4. The present application can realize the fixation of the steel pipe and the pushing of the installation disc by the steel pipe by cooperating with other structures, so as to complete the polishing.

[0021] 5. The guide cover is in a horn structure, which can not only limit and extrude the ball head rod, but also make the polishing waste fall into the receiving box. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the building steel structure cutting and welding integrated device proposed in the present application; Figure 2 It is another angle structural schematic view of the building steel structure cutting and welding integrated device proposed in the present application; Figure 3 It is a structural schematic view of the steel pipe fixed in the annular rotating seat of the building steel structure cutting and welding integrated device proposed in the present application; Figure 4 It is a structural schematic view of the ball head rod cooperating with the guide cover of the building steel structure cutting and welding integrated device proposed in the present application; Figure 5 It is a structural schematic view of the polishing mechanism removing the guide cover of the building steel structure cutting and welding integrated device proposed in the present application; Figure 6 It is a structural schematic view of the installation disc of the building steel structure cutting and welding integrated device proposed in the present application.

[0023] In the figure: 1 - mounting frame; 2 - transverse moving base frame; 3 - butt joint sliding rail; 4 - electric telescopic cylinder; 5 - steel pipe; 6 - electric telescopic seat; 7 - welding assembly; 8 - moving seat; 9 - butt joint moving control assembly; 10 - transverse moving control assembly; 11 - transverse moving seat; 12 - cutting support seat; 13 - cutting moving control assembly; 14 - cutting base; 15 - stand; 16 - guide cover; 17 - receiving box; 18 - clamping plate; 19 - electric clamping cylinder; 20 - annular rotating seat; 21 - first protruding tooth; 22 - first rotating control motor; 23 - first rotating control gear; 24 - annular support seat; 25 - second polishing piece; 26 - rotating drum; 27 - second protruding tooth; 28 - ball head rod; 29 - cutting saw blade; 30 - cutting control motor; 31 - second rotating control gear; 32 - second rotating control motor; 33 - first spring; 34 - first polishing piece; 35 - installation disc; 36 - movable frame; 37 - sliding column; 38 - second spring. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be further described in detail in combination with specific embodiments.

[0025] Embodiments of the present application are described below by way of example with reference to the accompanying drawings, in which like or similar elements or components are designated by the same or similar reference signs, and the embodiments described below are examples only, which are for the purpose of explanation only and are not to be taken in a limiting sense.

[0026] Embodiment 1: A cutting and welding integrated device for building steel structure, as shown in the drawings, comprising: Figures 1-6 A cutting mechanism for cutting the steel pipe 5 to make the end faces of two steel pipes 5 flush; A polishing mechanism for polishing the end faces and annular outer side walls of the cut steel pipes 5; A butt joint mechanism for butt jointing the end portions of two polished steel pipes 5; A welding mechanism for welding the end portions of the butt jointed two steel pipes 5; By providing the cutting mechanism, polishing mechanism, butt joint mechanism and welding mechanism, the end faces of the two steel pipes 5 can be adapted to ensure the final welding quality, and the entire process is automated, improving the processing efficiency.

[0027] In order to facilitate the welding operation; as shown in the drawings, the welding mechanism comprises a mounting frame 1, an electric telescopic seat 6 is installed on the mounting frame 1, a welding assembly 7 is installed at the bottom end of the electric telescopic seat 6, the electric telescopic seat 6 is used to control the height of the welding assembly 7, and the butt joint position of the two steel pipes 5 is located directly below the welding assembly 7. Figure 1

[0028] In order to facilitate the cutting operation; as shown in the drawings, Figure 2 Figure 4 The cutting mechanism comprises a cutting support seat 12, a cutting saw blade 29 is rotatably installed on the cutting support seat 12 through a shaft, and a cutting control motor 30 is installed on one side of the cutting support seat 12 for controlling the rotation of the cutting saw blade 29.

[0029] In order to facilitate the control of the movement of the structure for cutting; as shown in the drawings, Figure 2 Figure 4 The cutting mechanism further comprises a cutting base 14, the cutting support seat 12 slides in the inner wall of the cutting base 14, and a cutting movement control assembly 13 is installed on the cutting base 14, which is used to control the translational sliding of the cutting support seat 12 in the cutting base 14. The cutting movement control assembly 13 can adopt a motor and a lead screw structure, which is not described here.

[0030] In order to facilitate the polishing operation; as shown in the drawings, Figure 1 Figure 4 Figure 5 ,​​​​​​Figure 6 The grinding mechanism comprises: A stand 15, a rotating drum 26 is rotatably installed on the stand 15, and a rotation control part for controlling the rotation of the rotating drum 26 is installed on the stand 15; A slide column 37 is installed on the rotating drum 26, one end of the slide column 37 is provided with a mounting disc 35, the mounting disc 35 is provided with circumferentially distributed first grinding pieces and second grinding pieces, the first grinding pieces and the second grinding pieces are alternately arranged, the first grinding pieces are used for grinding the end face of the steel pipe 5, and the second grinding pieces are used for grinding the side face of the end of the steel pipe 5; By arranging the grinding mechanism, one end of the steel pipe 5 can be tightly attached to the first grinding piece, the outer wall of the steel pipe 5 is tightly attached to the second grinding piece, the rotating drum 26 is driven to rotate, and then the first grinding piece and the second grinding piece are used to synchronously grind the steel pipe 5, so that the two steel pipes 5 are more tightly connected, the welding material is more easily attached, and the welding quality is guaranteed.

[0031] In order to facilitate grinding of the side face of the end of the steel pipe 5, as shown in Figure 4 、 Figure 5 、 Figure 6 The first grinding piece is a first grinding piece 34, the mounting disc 35 is provided with circumferentially distributed strip-shaped mounting grooves, the first grinding piece 34 is detachably installed in the strip-shaped mounting grooves, and when the first grinding piece 34 is installed in the strip-shaped mounting grooves, the grinding surface of the first grinding piece 34 protrudes from the outer wall of the mounting disc 35.

[0032] In order to facilitate grinding of the side face of the end of the steel pipe 5, as shown in Figure 4 、 Figure 5 、 Figure 6 The slide column 37 is connected to the inner wall of the end of the rotating drum 26 in a relative sliding manner but not in a relative rotating manner, the mounting disc 35 and the rotating drum 26 are connected through a first spring 33, the second grinding piece comprises a movable frame 36, the mounting disc 35 is provided with circumferentially distributed strip-shaped cavities, one end of the movable frame 36 slides in the strip-shaped cavities, the end of the movable frame 36 and the inner wall of the strip-shaped cavities are connected through a second spring 38, the other end of the movable frame 36 extends to the outside of the strip-shaped cavities and is fixed with a second grinding piece 25, each second grinding piece 25 is circumferentially distributed about the center of rotation of the mounting disc 35, and a ball head rod 28 is fixed on the movable frame 36; a guide cover 16 is fixed on the stand 15, the inner diameter of the guide cover 16 gradually increases away from the stand 15, and an inner side annular inclined surface of the guide cover 16 is located on the movement path of the ball head rod 28; By setting the first polishing piece and the second polishing piece, when polishing, the end of the steel pipe 5 can press the first polishing piece 34, and at the same time, the slide column 37 is pushed into the rotating drum 26, in the process, the guide cover 16 limits and extrudes the ball head rod 28, so that each second polishing piece 25 is tightly attached to the outer wall of the end of the steel pipe 5, when the rotating drum 26 rotates, the mounting disc 35 rotates, and the synchronous polishing of the end face and the side wall of the end face of the steel pipe 5 is realized; the structure can adapt to steel pipes 5 of different sizes, and does not need an additional power source for adjustment.

[0033] In order to control the polishing operation; as Figure 4 As shown, the rotating control part includes a second rotating control motor 32, the second rotating control motor 32 is fixed on the stand 15, the output end of the second rotating control motor 32 is connected with a second rotating control gear 31, the outer side of the rotating drum 26 is provided with a second convex tooth 27 distributed in a circle, and the second convex tooth 27 is engaged with the second rotating control gear 31.

[0034] In order to facilitate the fixing of the steel pipe 5; as Figure 3 As shown, the butt joint mechanism includes a position control assembly and a clamping assembly, the clamping assembly includes an annular support seat 24, the annular support seat 24 is installed on the position control assembly, the annular support seat 24 is rotatably installed with an annular rotating seat 20, the outer side of the annular rotating seat 20 is fixed with a circularly distributed electric clamping cylinder 19, the output end of the electric clamping cylinder 19 is connected with a clamping plate 18 after penetrating through the annular rotating seat 20, one side of the annular support seat 24 is fixed with a support plate, the support plate is installed with a first rotating control motor 22, the output end of the first rotating control motor 22 is installed with a first rotating control gear 23, the outer side of the annular rotating seat 20 is provided with a first convex tooth 21 distributed in a circle, and the first rotating control gear 23 is engaged with the first convex tooth 21. Preferably, the number of clamping plates 18 is three, which are evenly and circularly distributed around the center of the annular rotating seat 20.

[0035] In order to facilitate the control of the rotation of the steel pipe 5; as Figure 3 As shown, the position control assembly includes a transverse moving base frame 2, the transverse moving base frame 2 is slidably connected with a transverse moving seat 11, the transverse moving base frame 2 is installed with a transverse moving control assembly 10 for controlling the sliding translation of the transverse moving seat 11, the bottom of the transverse moving seat 11 is fixed with a butt joint sliding rail 3, the butt joint sliding rail 3 is slidably connected with a moving seat 8, the butt joint sliding rail 3 is installed with a butt joint moving control assembly 9 for controlling the movement of the two moving seats 8, one side of the moving seat 8 is installed with an electric telescopic cylinder 4, and the output end of the electric telescopic cylinder 4 is fixed on the annular support seat 24. Among them, the transverse moving control assembly 10, the butt joint moving control assembly 9 and the like can adopt a conventional lead screw and motor control, which will not be described here in detail. Through setting the position control assembly and the clamping assembly, cooperation with other structures can be realized to fix the steel pipe 5 and push the installation disc 35 by the steel pipe 5, so that the grinding is completed.

[0036] One side of the stand 15 is provided with a receiving box 17 for receiving cutting and grinding waste; Since the guide cover 16 is a horn-shaped structure, not only can the ball head rod 28 be limited and extruded, but also the grinding waste can slide into the receiving box 17.

[0037] For the parts not disclosed in the application, such as necessary control modules, specific control methods, signal transmission methods, power supply methods and the like, the skilled in the art can ensure the smooth implementation of the technical scheme of the application based on common sense, normal thinking logic and prior art.

[0038] The above is only the preferred specific implementation of the application, but the protection scope of the application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A device for integrated cutting and welding of building steel structures, characterized in that, include: A cutting mechanism is used to cut steel pipes (5) so that the end faces of the two steel pipes (5) are flush. A grinding mechanism is used to grind the end face of the cut steel pipe (5) and the annular outer wall of the end face. A docking mechanism is used to dock the ends of two polished steel pipes (5); A welding mechanism is used to weld the ends of two steel pipes (5) together.

2. The integrated cutting and welding device for building steel structures according to claim 1, characterized in that, The welding mechanism includes a mounting frame (1), an electric telescopic seat (6) is mounted on the mounting frame (1), a welding assembly (7) is mounted on the bottom of the electric telescopic seat (6), the electric telescopic seat (6) is used to control the height of the welding assembly (7), and the two steel pipes (5) are located directly below the welding assembly (7).

3. The integrated cutting and welding device for building steel structures according to claim 1, characterized in that, The cutting mechanism includes a cutting support (12), on which a cutting saw blade (29) is rotatably mounted via a shaft, and a cutting control motor (30) for controlling the rotation of the cutting saw blade (29) is mounted on one side of the cutting support (12).

4. The integrated cutting and welding device for building steel structures according to claim 3, characterized in that, The cutting mechanism also includes a cutting base (14), a cutting support (12) sliding on the inner wall of the cutting base (14), and a cutting movement control component (13) installed on the cutting base (14). The cutting movement control component (13) is used to control the cutting support (12) to slide within the cutting base (14).

5. The integrated cutting and welding device for building steel structures according to claim 1, characterized in that, The polishing mechanism includes: A stand (15) is provided, on which a rotating drum (26) is rotatably mounted, and on which a rotation control unit for controlling the rotation of the rotating drum (26) is mounted; The sliding column (37) is mounted on the rotating drum (26). One end of the sliding column (37) is equipped with a mounting plate (35). The mounting plate (35) is equipped with a first grinding component and a second grinding component distributed in a circle. The first grinding component and the second grinding component are alternately arranged. The first grinding component is used to grind the end face of the steel pipe (5), and the second grinding component is used to grind the side of the end of the steel pipe (5).

6. The integrated cutting and welding device for building steel structures according to claim 5, characterized in that, The first grinding component is a first grinding disc (34). A circumferentially distributed strip mounting groove is provided on the mounting plate (35). The first grinding disc (34) is detachably installed in the strip mounting groove. When the first grinding disc (34) is installed in the strip mounting groove, the grinding surface of the first grinding disc (34) protrudes from the outer wall of the mounting plate (35).

7. The integrated cutting and welding device for building steel structures according to claim 6, characterized in that, The sliding column (37) is connected to the inner wall of the end of the rotating cylinder (26) in a relatively sliding but not relatively rotating manner. The mounting plate (35) and the rotating cylinder (26) are connected by a first spring (33). The second grinding component includes a movable frame (36). The mounting plate (35) has a circumferentially distributed strip cavity. One end of the movable frame (36) slides in the strip cavity, and the end of the movable frame (36) and the inner wall of the strip cavity are connected by a second spring (38). The other end of the movable frame (36) extends to the outside of the strip cavity and is fixed with a second grinding disc (25). Each second grinding disc (25) is circumferentially distributed about the rotation center of the mounting plate (35). A ball head rod (28) is fixed on the movable frame (36). A guide cover (16) is fixed on the upright frame (15). The inner diameter of the guide cover (16) gradually increases in the direction away from the upright frame (15), and the inner annular inclined surface of the guide cover (16) is located on the movement path of the ball head rod (28).

8. The integrated cutting and welding device for building steel structures according to claim 5, characterized in that, The rotation control unit includes a second rotation control motor (32), which is fixed on the stand (15). The output end of the second rotation control motor (32) is connected to a second rotation control gear (31). The outer side of the rotating drum (26) is provided with a second convex tooth (27) distributed in a circle, which meshes with the second rotation control gear (31).

9. The integrated cutting and welding device for building steel structures according to claim 1, characterized in that, The docking mechanism includes a position control component and a clamping component. The clamping component includes an annular support base (24), which is mounted on the position control component. An annular rotating base (20) is rotatably mounted inside the annular support base (24). A circularly distributed electric clamping cylinder (19) is fixed on the outside of the annular rotating base (20). The output end of the electric clamping cylinder (19) passes through the annular rotating base (20) and is connected to a clamping plate (18). A support plate is fixed on one side of the annular support base (24). A first rotation control motor (22) is mounted on the support plate. A first rotation control gear (23) is mounted on the output end of the first rotation control motor (22). A circularly distributed first convex tooth (21) is provided on the outside of the annular rotating base (20). The first rotation control gear (23) meshes with the first convex tooth (21).

10. The integrated cutting and welding device for building steel structures according to claim 9, characterized in that, The position control component includes a transverse moving base frame (2), which is slidably connected to a transverse moving seat (11). A transverse moving control component (10) for controlling the sliding translation of the transverse moving seat (11) is installed on the transverse moving base frame (2). A docking slide rail (3) is fixed at the bottom of the transverse moving seat (11). A moving seat (8) is slidably connected inside the docking slide rail (3). A docking moving control component (9) for controlling the movement of the two moving seats (8) is installed on the docking slide rail (3). An electric telescopic cylinder (4) is installed on one side of the moving seat (8). The output end of the electric telescopic cylinder (4) is fixed on an annular support seat (24).

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