Traction type correction equipment

Abstract

The invention discloses traction type correction equipment, belongs to the field of civil engineering and mechanical engineering, and particularly relates to the field of steel pipe correction of civil engineering. Comprising a correcting device, a traction device, a clamping device and a lathe bed, the lathe bed provides mounting positions for the traction device and the clamping device and is used for accommodating a tubular body to be corrected; the clamping device is fixedly connected with the first end of the tubular body; the correcting device is strip-shaped, and the head of the correcting device is connected with the traction device; the traction device pulls the correction device in from the first end of the tubular body and pulls the correction device out from the second end of the tubular body; the clamping device comprises a support assembly, a loading assembly, a uniform loading assembly and a certain number of clamping assemblies. The loading assembly can generate displacement, the displacement acts on the uniform load assembly, and the uniform load assembly acts the displacement on each clamping assembly; and the clamping assembly can clamp the wall of the tubular body under the action of the uniform load assembly. According to the device, the sunken steel pipe can be corrected, and sinking and bending correction can be conducted on the steel pipe at the same time.

Description

Technical Field

[0001] The invention belongs to the fields of civil engineering and mechanical engineering, and particularly relates to the field of steel pipe correction in civil engineering. Background Art

[0002] In civil engineering projects, scaffolding is the construction work platform for personnel and the foundation of engineering operations. It is related to the safety of construction personnel and the cost of the project. The goal pursued in the industry is that the scaffolding should be sturdy, reliable and low-cost.

[0003] At present, the material used to build scaffolding in the industry is round steel pipes. The steel pipes will be recycled according to the needs of the project. The recycled steel pipes usually have defects such as dents and bends. Before using these steel pipes, they will be inspected and treated accordingly. The existing technology can only straighten the bent steel pipes, and for steel pipes with dent defects, the dented area can only be cut off to shorten the length of the steel pipe, and the dented area can only be scrapped. Due to the large number of steel pipes, if steel pipes with dent defects are mixed in, the overall strength of the scaffolding will be reduced, which will pose a safety hazard.

[0004] The industry needs a device that can repair dent defects and even correct dents and bends on steel pipes at the same time.

[0005] In summary, the prior art cannot correct the dented steel pipe, let alone correct the dent and bend of the steel pipe at the same time. Summary of the invention

[0006] The present invention aims to solve the problem that the prior art cannot correct a concave steel pipe (ie a tubular body), and cannot correct the concave and bend of the steel pipe at the same time.

[0007] In order to achieve the above purpose, the scheme is as follows:

[0008] A pulling correction device is designed, comprising a correction device, a traction device, a clamping device and a bed; the bed provides an installation position for the traction device and the clamping device, and the area between the clamping device and the traction device is used to accommodate the tubular body to be corrected; the clamping device is fixedly connected to the first end of the tubular body, and is provided with a hole for accommodating the correction device to pass through; the correction device is in the shape of an elongated strip, and its head is connected to the traction device; the traction device pulls the correction device into the first end of the tubular body and pulls it out from the second end of the tubular body; the correction device is in the shape of an elongated strip, and its head is a correction component with the function of correcting the cross-sectional shape of the tubular body, and the tail has a straightening component with the function of straightening the tubular body; the clamping device comprises a bracket assembly, a loading assembly, a load-balancing assembly and a certain number of clamping assemblies; the bracket assembly is fixedly connected to the bed; the loading assembly can generate displacement, and this displacement acts on the load-balancing assembly, and the load-balancing assembly applies the displacement to each clamping assembly; the clamping assembly can clamp the wall of the tubular body under the action of the load-balancing assembly; the clamping device is provided with a space allowing the correction device to pass through.

[0009] Furthermore, the bracket assembly includes a first support plate, a support column and a second support plate; the first support plate is roughly rectangular with a through hole in the middle, and the inner diameter of the through hole is larger than the outer diameter of the tubular body; three load-balancing assemblies and three support columns are evenly distributed and fixedly connected around the through hole on the first surface of the first support plate; the directions of all support columns are parallel to the normal of the first surface; the second surface of the first support plate is in contact with the bed and is fixedly connected to it; the second support plate is roughly triangular with a through hole in the middle, and the center line of this through hole coincides with the center line of the through hole of the first support plate; the second support plate and the first support plate are arranged parallel to each other, the first surface of the second support plate faces the first surface of the first support plate, and the second support plate is fixedly connected to the three support columns; there is space from the second support plate to the first support plate, and the loading assembly, the load-balancing assembly and the clamping assembly are installed in sequence.

[0010] Furthermore, the loading assembly includes a second actuating block, a first actuating block, a positioning sleeve and a first spherical surface; the second actuating block is annular, the second end face is perpendicular to the center line of the annulus, the center line coincides with the center line of the through hole of the second support plate, the second end face is attached to and fixedly connected with the first face of the second support plate, and the first end face is provided with three end face cams evenly distributed along the circumferential direction of the center line; the first actuating block is annular, the center line of the annulus coincides with the center line of the through hole of the second support plate; the first end face of the first actuating block faces the first end face of the second actuating block; the first end face of the first actuating block One end face is provided with three end face sliders which are evenly distributed along the circumferential direction of the center line; the second end face of the first actuating block is a part of a sphere whose center is on the center line, and the center of the sphere points to one side of the second end face on the center line, that is, the spherical surface is on the outer side of the circular ring instead of the inner side of the circular ring; the positioning sleeve is a stretching body of the circular ring cross section, and the second end is fitted and fixedly connected to the first surface of the second supporting plate, and the center line of the positioning sleeve coincides with the center line of the through hole of the second supporting plate, which plays a role in positioning and supporting the first actuating block, and the first actuating block can rotate a certain angle and move axially relative to the second actuating block.

[0011] Furthermore, the end face slider is a combination of an inclined surface and a plane, and the top is a plane; the end face cam is a protrusion, and the end face slider contacts the surface of the end face cam; the end face slider is located on the plane at the top of the end face cam, and the distance between the first actuating block and the second actuating block is the largest and is in a clamping force retention state.

[0012] Furthermore, the inclination angle of the inclined surface of the end face cam is large at first and then small.

[0013] Furthermore, the outer peripheral surface of the first actuating block is fixedly connected to a long strip-shaped operating handle.

[0014] Furthermore, the load-balancing assembly includes an actuating plate, a guide hole and a second spherical surface; the middle part of the actuating plate is a stretching body with a circular cross-section, the center line of the circular ring coincides with the center line of the through hole of the first support plate, and the first end of the stretching body with a circular cross-section is provided with a second spherical surface, and the second spherical surface and the first spherical surface form a spherical surface pair; three pressure plates extend radially from the actuating plate, and these three pressure plates are evenly distributed circumferentially around the center line, and their actuating surfaces face the first support plate; a long hole, i.e., a guide hole, is provided on the side of each pressure plate along the radial direction of the actuating plate; a guide column fixedly connected to the first support plate, and three guide columns are evenly distributed circumferentially along the center line and inserted into the corresponding guide holes.

[0015] Furthermore, the clamping assembly includes a first clamping body, a second clamping body and a clamping base; the clamping base is fixedly connected to the first surface of the first support plate; the first clamping body is slidably connected to the clamping base, and the sliding direction is along the radial direction of the central through hole of the first support plate; the first clamping body is provided with a first clamping jaw on one side close to the through hole of the first support surface, the first clamping jaw extends in the direction of the second surface of the first support plate, and the side of the first clamping jaw facing the clamping base is the clamping surface. The second clamping body is swingably connected to the first clamping body, the first end of the second clamping body contacts the actuating surface of the actuating plate, and can slide along the actuating surface in the radial direction of the central through hole of the first support plate, the second end of the second clamping body is the second clamping jaw, and the side of the second clamping jaw and the first clamping jaw can contact the inner and outer surfaces of the tubular body respectively.

[0016] Furthermore, the main body of the second clamping body is in the shape of an elongated strip, and the first end is rotatably connected to the actuating roller, the axis of the actuating roller is perpendicular to the sliding direction of the first clamping body and is parallel to the swinging axis of the second clamping body and the first clamping body; a support shaft 4422 is provided at the first end of the main body of the second clamping body, and its axis is the swinging axis of the second clamping body and the first clamping body; and the second clamping jaw is provided at an obtuse angle to the main body of the second clamping body.

[0017] Furthermore, the clamping assembly comprises a first clamping body, a second clamping body and a clamping base; the clamping base is fixedly connected to the first surface of the first support plate; the first clamping body body is slidably connected to the clamping base, and the sliding direction is along the radial direction of the central through hole of the first support plate; a first clamping jaw is provided on a side of the first clamping body close to the through hole of the first support surface, the first clamping jaw extends in the direction of the second surface of the first support plate, and the side of the first clamping jaw facing the clamping base is the clamping surface; the second clamping body of the clamping device is in the shape of a long strip, and a protrusion is provided in the middle part, which contacts the actuating surface of the actuating plate; the second end of the second clamping body of the clamping device is the second clamping jaw, and its end face cooperates with the first clamping jaw to achieve clamping, and the first end of the second clamping body is swingably connected to the end of the first clamping body away from the first clamping jaw.

[0018] The invention can correct the concave steel pipe, and can correct the concave and bend of the steel pipe at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 Schematic diagram of the tubular body to be corrected;

[0021] Figure 2 Exploded view of the calibration equipment (in order to make the tubular objects in this figure and some subsequent figures clearer, they are split along the center line and half hidden);

[0022] Figure 3 Schematic diagram of the calibration equipment operation;

[0023] Figure 4a , 4b , 4c, step-by-step schematic diagram of the correction device for correcting the tubular body;

[0024] Figure 5 Embodiment 1, an exploded view of a calibration device;

[0025] Figure 6 Embodiment 1, a side view of the coaxial state of each unit of the correction device;

[0026] Figure 7 yes Figure 6 Side view of

[0027] Figure 8 yes Figure 5 Stereoscopic view of the calibration unit in;

[0028] Fig. 9 yes Figure 5 A cross-sectional view of the shape correction unit along the axis;

[0029] Fig.10 Embodiment 2, a three-dimensional view of the correction unit of the correction device;

[0030] Fig.11 Embodiment 2, a side view of the coaxial state of each unit of the correction device;

[0031] Fig.12 Embodiment 2, a three-dimensional view of the straightening assembly of the correction device;

[0032] Fig.13 yes Fig.11 Side view of

[0033] Fig.14 Embodiment 3, a side view of the coaxial state of each unit of the correction device;

[0034] Fig.15 yes Fig.14 Side view of

[0035] Fig.16 Embodiment 4, a three-dimensional view of the correction unit of the correction device;

[0036] Fig.17 Embodiment 4, side view of the calibration device;

[0037] Fig.18 Embodiment 1, an exploded view of the clamping device;

[0038] Fig.19 Embodiment 1, an exploded view of the clamping device;

[0039] Fig. 20 Embodiment 1, an exploded view of a clamping assembly;

[0040] Fig.21 yes Fig. 20 Side view after assembly;

[0041] Fig. 22 Embodiment 1, schematic diagram of an unclamped tubular body (parts in this figure and some subsequent figures are cut away for a clearer expression);

[0042] Fig.23 Embodiment 1, schematic diagram of clamping a tubular body;

[0043] Fig.24 Figure 3 Side view of the bed with the traction device and bed hidden;

[0044] Fig.25 Embodiment 2, an exploded view of the clamping assembly;

[0045] Fig.26 yes Fig.25 Side view after assembly;

[0046] Fig. 27 Embodiment 2, schematic diagram of an unclamped tubular body;

[0047] Fig.28 Embodiment 2, schematic diagram of clamping a tubular body;

[0048] Fig.29 Fig.28 Stereoscopic view of

[0049] Fig.30 Fig.28 Stereoscopic view of.

[0050] The markings in the figure are:

[0051] 1. Tubular body;

[0052] 2. Calibration device;

[0053] 21. Main pulling joint; 22. Shape adjustment component; 221. Shape adjustment unit; 2211. First joint of shape adjustment unit; 2212. Second joint of shape adjustment unit; 2213. Radial shape adjustment support; 23. Straightening component; 231. Straightening unit; 2311. Mounting hole; 2312. Radial straightening support; 232. Straightening mandrel; 2321. Straightening mandrel pulling joint; 233. Bushing; 2401. Roller;

[0054] 3. Traction device;

[0055] 31. traction rope; 32. rope release assembly; 33. traction assembly;

[0056] 4. Clamping device;

[0057] 41. Bracket assembly; 411. First support plate; 412. Support column; 413. Second support plate; 42. Loading assembly; 421. First spherical surface; 422. First actuating block; 4221. End surface slider; 4222. Operating handle; 423. Second actuating block; 4231. End surface cam; 424. Positioning sleeve; 43. Load-balancing assembly; 431. Second spherical surface; 432. Actuating plate; 433. Guide hole; 44. Clamping assembly; 441. First clamping body; 4411. First clamping jaw; 4412. Support shaft hole; 4413. Groove; 442. Second clamping body; 4421. Second clamping jaw; 4422. Support shaft; 4423. Actuating roller; 443. Clamping base;

[0058] 5. Bed. DETAILED DESCRIPTION

[0059] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0060] like Figure 1 As shown, the tubular body 1 corrected by the present invention is a stretched body along the normal direction of a hollow section. Specifically, the section can be a polygon, a curved polygon or a circle. More specifically, the tubular body 1 described in the present invention is a steel pipe with a circular section. The tubular body 1 shows two defects, namely, a dent and a bend. The technical effect to be achieved by the present invention is to restore the dent area of ​​the tubular body 1 and to straighten the bend, that is, to complete the correction of the tubular body 1.

[0061] like Figure 2 and Figure 3 As shown, the correction device of the present invention comprises a correction device 2, a traction device 3, a clamping device 4 and a bed 5; the bed 5 has sufficient rigidity and strength to provide an installation position for the traction device 3 and the clamping device 4, the two are arranged relative to each other, and ensure that the relative positions of the two remain unchanged during the pulling operation, and the area between the clamping device 4 and the traction device 3 is used to accommodate the tubular body 1 to be corrected;

[0062] The clamping device 4 is fixedly connected to the first end of the tubular body 1 and is provided with a hole for accommodating the correction device 2 to pass through; the correction device 2 is in the shape of an elongated strip, and its head is connected to the traction device 3 through a traction rope 31, and the traction device 3 pulls the correction device 2 in from the first end of the tubular body 1 and out from the second end of the tubular body 1; the correction device 2 is in the shape of an elongated strip, and its head is a correction component 22 with the function of correcting the cross-sectional shape of the tubular body 1, and the tail has a straightening component 23 with the function of straightening the tubular body 1.

[0063] The bed 5 is formed of structural parts connected to each other and is in a long strip shape. The first end is connected to the clamping device 4, and the second end is connected to the traction device 3. Specifically, the first end and the second end of the bed 5 are higher than the other parts of the bed 5, thereby raising the positions of the clamping device 4 and the traction device 3, so that a space for accommodating the tubular body 1 to be corrected is formed on the upper part of the bed 5. The material of the bed 5 can be selected from metal, or materials with equivalent structural strength such as plastic. Alternatively, the bed 5 is composed of a first component and a second component, which are respectively connected to the clamping device 4 and the traction device 3. The first component and the second component have no physical structural connection, and the first component and the second component are respectively inserted into the ground and connected to the ground.

[0064] The traction device 3 has the function of pulling the traction rope 31 and also has the function of pushing the traction rope 31 out. Specifically, it includes a traction rope 31, a rope release assembly 32 and a traction assembly 33; the first end of the traction rope 31 can be disconnected and connected with the correction device 2, and the second end passes through the rope release assembly 32 and is connected with the traction assembly 33. Each cross section of the traction rope 31 can withstand a certain bending moment (excluding the chain-mounted structure) and can transmit a certain thrust, so that under the push of the rope release assembly 32, the first end of the traction rope 31 can pass through the inside of the tubular body 1 to be corrected; more specifically, the traction rope 31 is preferably a steel wire rope or a nylon rope. The rope release assembly 32 includes two extrusion wheels rotating with parallel axes, which are driven by a motor to rotate synchronously and in opposite directions. The traction rope 31 passes through the middle of the above-mentioned two extrusion wheels and is clamped by the extrusion wheels. The rotation of the extrusion wheels plays the role of extending and collecting the traction rope 31. The traction assembly 33 is a winch. It is also possible to combine the functions of the rope release assembly 32 and the traction assembly 31, and the rope release assembly 32 plays the role of releasing the rope and pulling.

[0065] like Figure 4a , 4b As shown in Figures 4c, the first end of the tubular body 1 is fixedly connected to and secured by the clamping device 4 (not shown). Under the traction of the traction device 3, the correction device 2 enters the interior of the tubular body 1 from the first end of the tubular body 1 and leaves from the second end of the tubular body 1; the correction component 22 of the correction device 2 pushes out the depression of the tubular body 1 to restore it, and the subsequent straightening component 23 of the tubular body 1 straightens the bend of the tubular body 1. As the correction device 2 leaves the tubular body 1, the correction of the tubular body 1 is completed.

[0066] The specific embodiment of the calibration device 2 is as follows.

[0067] like Figure 5As shown, the correction device 2 includes a main pulling joint 21, a shaping component 22 and a straightening component 23, the connection between which can transmit pulling force, and the central axis of any one of the interconnected components can swing in a conical space relative to the central axis of another component; the connection structure between them can be a spherical hinge, a cross universal joint, a flexible shaft connection, a braided steel wire flexible shaft connection, or an elastic element flexible connection; they are connected in the order of entering the tubular body 1 to work, namely the main pulling joint 21, the shaping component 22 and the straightening component 23, that is, the main pulling joint 21 and the straightening component 23 are respectively located at the head and tail of the correction device 2; when the central axes of the main pulling joint 21, the shaping component 22 and the straightening component 23 of the correction device 2 are coaxial, the radial direction of the cross section forms m spaces, m is not less than 3, preferably 3, and this space is used to accommodate a device for fixing the tubular body 1.

[0068] More specific.

[0069] Correction device 2 embodiment 1, as Figures 5 to 9 shown.

[0070] like Figure 5 As shown, the main pulling joint 21 is provided with a first end and a second end at both ends along the center axis direction thereof.

[0071] The first end of the main pulling joint 21 is fixedly connected to the end of the traction rope 31. The fixing method can be that the main pulling joint 21 is made of metal material and the first end is provided with a hole coaxial with the central axis. The traction rope 31 is a steel wire rope inserted into the hole, and an extruder is used to extrude the first end of the main pulling joint 21, and the hole shrinks and holds the traction rope 31 to achieve the fixed connection between the two. Alternatively, the first end of the main pulling joint 21 is provided with a hole perpendicular to the central axis, and the traction rope 31 passes through the above-mentioned hole and folds back to form an overlapping area on the traction rope 31. The overlapping area is clamped by a U-shaped bolt clamp or the like to achieve the fixed connection between the traction rope 31 and the main pulling joint 21.

[0072] The second end of the main pulling joint 21 is provided with an interface with the shape-correcting component 22. Specifically, the second end of the main pulling joint 21 is provided with a stepped hole coaxial with the central axis, the outer hole diameter is smaller than the inner hole diameter, and the sides of the two holes are connected by a stepped surface, which is a part of the spherical surface, and forms a spherical pair with the corresponding joint of the shape-correcting component 22, that is, a spherical hinge; in order to allow the component to have space to swing, the side wall of the outer hole of the above-mentioned stepped hole is conical; in order to achieve assembly with the shape-correcting component 22, an open space is provided in a partial area of ​​the side wall of the stepped hole, and the corresponding joint of the shape-correcting component 22 is radially installed from this space. More specifically, an anti-escape structure is provided in the above-mentioned space to prevent the corresponding joint of the shape-correcting component 22 from unexpectedly escaping from the spherical surface. This device can be a block filled in this space, the internal compression joint of the block, the outer contour of the block is flush with the outside, and is fixed with a hoop.

[0073] like Figure 5 , Figure 8 and Fig. 9 As shown, the shaping component 22 includes a certain number of shaping units 221, the number is n, n is not less than 2, and preferably 4; the connection between adjacent shaping units 221 can transmit tension, and the central axis of any one of the interconnected shaping units 221 can swing relative to the central axis of another in the conical space.

[0074] The body of the shape correction unit 221 is provided with a first shape correction unit joint 2211 and a second shape correction unit joint 2212 at both ends along the central axis of the body. The first shape correction unit joint 2211 is a ball head with a handle, and the ball head is connected to the body through a columnar body smaller than the diameter of the ball head; the second shape correction unit joint 2212 is a spherical seat provided on the body. Specifically, a stepped hole coaxial with the central axis is provided on the end face of the body, and the outer hole diameter is smaller than the inner hole diameter. The sides of the two holes are connected by a stepped surface, which is a part of the spherical surface and forms a spherical pair, i.e., a spherical hinge, with the ball head of the first shape correction unit joint 2211. In order to allow the component to have swing space, the above-mentioned stepped hole is provided. The side wall of the outer hole of the hole is conical; in order to achieve assembly with other correction units 221, an open space is set in the side wall part of the stepped hole, and the first joint 2211 of the correction unit is radially inserted from this space. More specifically, an anti-escape structure is set in the above-mentioned space to prevent the corresponding joint of the correction component 22 from unexpectedly escaping from the spherical surface. This device can be a block filled in this space, the internal compression joint of the block is fixedly connected to the body, and the outer contour of the block can also be flush with the outside and fixed with a hoop.

[0075] The main body of the correction unit 221 radially extends a certain number of radial correction supports 2213, the number is m, m is not less than 3, preferably 3, and preferably symmetrically distributed around the central axis; the radial correction support 2213 includes two parts, namely a connector and a correction plate, the correction plate is long and parallel to the central axis, located away from the main body, and is fixed to the main body through the connector in the radial direction. The side of the correction plate is part of the rotation surface around the central axis. The radius of each point on the side of the correction plate around the central axis shows an increasing trend along the central axis from the head to the tail of the correction device 2, and forms the maximum radius in the middle and rear part.

[0076] A certain number of shape-correcting units 221 are connected head to tail to form a shape-correcting component 22, and the maximum radius of each shape-correcting unit 221 is different, and the radius increases from R1 to R from the head to the tail, R1 is smaller than the tubular body 1, preferably accounting for 70% of the radius of the tubular body 1, and R is equivalent to the radius of the tubular body 1, preferably slightly larger than the inner radius of the tubular body 1, preferably larger than 3% of the inner radius of the tubular body 1. In this way, the radius of the shape-correcting component 221 located between the head and the tail is preferably linearly differential.

[0077] like Figure 5 As shown, the straightening assembly 3 is long and has sufficient rigidity and strength to meet the function of straightening the tubular body 1. The body radially extends radial straightening supports 2312, the number of which is m, m is not less than 3, preferably 3, and preferably symmetrically distributed around the central axis. A straightening plate is set at a position away from the central axis of the radial straightening support 2312. The side of the straightening plate is part of the rotating surface around the central axis. The direction of the side extension is parallel to the central axis. The radius of each point on the side around the central axis is consistent along the central axis from the head to the tail of the correction device 2, which is roughly the same as the internal radius of the tubular body 1, preferably slightly larger than the internal radius of the tubular body 1, more specifically larger than 3% of the radius of the tubular body 1, and more specifically, the part at the head is a guide section, and the radius along the above direction shows an increasing trend. The head of the body of the straightening assembly 3 is provided with a straightening pulling joint 2321, which is a ball head with a handle. The ball head is connected to the body through a columnar body smaller than the diameter of the ball head; the ball head forms a spherical hinge with the spherical seat of the second joint 2212 of the correction unit.

[0078] The reason why the radius of the shaping unit 221 at the tail of the above-mentioned shaping component 22 and the straightening component 2 is slightly larger than the internal radius of the tubular body 1 is that the correction device 2 has only a few points of contact with the inside of the tubular body 1, that is, there is a certain stretching of the tube wall along the circumferential direction between each cross-section contact point, so as to reduce the pressure between the side and the inner wall, and compensate for it by increasing the side radius, that is, increasing the interference fit, thereby achieving better shaping and straightening effects.

[0079] When the central axes of all components of the correction assembly 2 are coaxial and all radial structures roughly coincide, the following will be presented: Figure 7 The projection effect shown in the figure should be emphasized that the present embodiment adopts a spherical pair, and the components can rotate relative to each other without causing Figure 7 effect, which is a feature that can be allowed; when the correction component 2 can be rotated to the same circumferential state at the entrance to the tubular body 1 to avoid the device that fixes the tubular body 1.

[0080] Correction device 2 embodiment 2, such as Figures 10 to 13 shown.

[0081] The radial shaping support 2213 and the radial straightening support 2312 in Example 1 have their side extension directions parallel to the central axis of their own components, and the trajectory passing through the inside of the tubular body 1 is a straight line. The area swept by the trajectory is limited, which limits the correction effect. The side sweeping trajectory can be changed to a spiral shape to increase the sweeping area and improve the correction effect. Based on Example 1, the following changes are made.

[0082] like Fig.10As shown, the correction plate of the radial correction support 2213 of the correction unit 221 is in the shape of an elongated strip, and its extension direction forms an angle with the central axis of the correction unit 221, and the angle is A, which is preferably less than 20° (according to the definition of this angle, the angle in Example 1 is 0°).

[0083] like Fig.12 As shown, the straightening assembly 23 includes a straightening unit 231, a straightening mandrel 232 and a sleeve 233. The body of the straightening unit 231 is annular, and a bearing is arranged in the hole in the center thereof. The inner hole of the bearing is a mounting hole 2311, and the center line of the straightening unit 231 is the center axis of the straightening unit 231; a certain number of radial straightening supports 2312 are extended radially from the outer side of the body, and the number is m, m is not less than 3, preferably 3, and preferably symmetrically distributed around the center axis; the radial straightening supports 2312 include two parts, namely a connector and a straightening plate, which are located away from the body and are fixedly connected to the body through the connector in the radial direction. The straightening plate is in the shape of a long strip, and its extension direction has an angle with the center axis of the straightening unit 221, and the angle is A, and A is preferably less than 20°; the side of the straightening plate is a part of the rotation surface around the center axis, and the radius of each point on the side of the straightening plate around the center axis is roughly the same as the internal radius of the tubular body 1, preferably slightly larger than the internal radius of the tubular body 1, and more specifically larger than 3% of the radius of the tubular body 1.

[0084] The straightening mandrel 232 is cylindrical, and a straightening pulling joint 2321 is provided at the first end, which is a ball head with a handle. The ball head is connected to the first end of the straightening mandrel 232 through a column smaller than the diameter of the ball head, and the ball head and the spherical seat of the second joint 2212 of the straightening unit form a spherical hinge; the first end of the straightening mandrel 232 is also provided with a shoulder, and a certain number of straightening units 231 are serially sleeved on the straightening mandrel 232, and the number is p, p is not less than 2, and preferably 6. Bushings 233 are installed between adjacent straightening units 231 so that adjacent straightening units 231 are not affected by each other when rotating. The second end of the straightening mandrel 232 is provided with a fastening device to axially fix the straightening unit 231, the straightening mandrel 232 and the bushing 233 together.

[0085] The above-mentioned angle A makes all components rotate in the same direction. Fig.13 As described above, after the increased angle A feature, there is still space in the circumferential direction for accommodating a device for fixing the tubular body 1 .

[0086] Correction device 2 embodiment 3, such as Fig.14 and Fig.15 shown.

[0087] The components in the second embodiment will be forced to rotate by the friction of the pipe wall during the correction work, and the rotation direction is the same. There is a certain friction in the spherical pair, which will drive the traction rope 31 to rotate. This rotation will damage the traction rope. The solution needs to reduce the friction of the spherical pair and add a degree of freedom of rotation between the main pulling joint 21 and the wire rope. It is also possible to change the rotation direction of adjacent components so that they produce torques in opposite directions of rotation to offset each other; at the same time, doing so also changes the side sweep trajectory to a double helix, further increasing the sweep area and improving the correction effect. Based on the second embodiment, the following changes are made.

[0088] The correction device 2 changes the two rotation directions alternately from the first correction unit 221 to the last straightening unit 231 in the order from the head to the tail; the absolute value of the angle A of each correction unit 221 and each straightening unit 231 is the same.

[0089] Correction device 2 embodiment 4, such as Fig.16 and Fig.17 shown.

[0090] In the above embodiments 1 to 3, there is sliding friction between the side surface and the inner wall of the tubular body 1. In order to reduce the friction, based on the above embodiments 1 to 3, rollers 2401 are installed at the far ends of the radial shaping support 2213 and the radial straightening support 2312.

[0091] In the first embodiment of the correction device 2 mentioned above, a connection structure without rotational freedom is used between each component, which can also achieve the expected effect. The connection structure between them can be a spherical hinge, a cross universal joint, a flexible shaft connection, a braided steel wire flexible shaft connection, or an elastic element flexible connection.

[0092] The specific embodiment of the clamping device 4 is as follows.

[0093] like Fig.18 and 19 As shown, the clamping device 4 includes a support assembly 41, a loading assembly 42, a load-balancing assembly 43 and a certain number of clamping assemblies 44, the number is m, m is not less than 3, preferably 3; the support assembly 41 is fixedly connected to the bed 5 and provides an installation position for other components; the loading assembly 42 can generate displacement, and this displacement acts on the load-balancing assembly 43, and the load-balancing assembly 43 applies the displacement to each clamping assembly 44, and makes the displacement of each clamping assembly 44 in its respective maximum displacement state; the clamping assembly 44 can clamp the wall of the tubular body 1 under the action of the load-balancing assembly 43; the clamping device 4 is provided with a space allowing the correction device 2 to pass through.

[0094] More specific.

[0095] The first embodiment of the clamping device 4 is as follows: Figures 18 to 24 shown.

[0096] The support assembly 41 includes a first support plate 411 , a support column 412 , and a second support plate 413 .

[0097] The first support plate 411 is a relatively thick plate in a roughly rectangular shape with a through hole in the middle. The inner diameter of the through hole is larger than the outer diameter of the tubular body 1 for the correction device 2 to pass through. Three load-balancing components 43 and three support columns 412 are evenly distributed and fixed around the through hole on the first surface of the first support plate 411. The load-balancing components 43 and the support columns 412 are arranged at intervals. The directions of all support columns 412 are parallel to the normal of the first surface. The second surface of the first support plate 411 is in contact with the bed 5 and is fixed thereto, and the fixing method may be bolt and nut connection.

[0098] The second support plate 412 is a thicker plate in a roughly triangular shape with a through hole in the middle. The inner diameter of the through hole is larger than the outer diameter of the correction device 2 and is used for the correction device 2 to pass through. The center line of this through hole coincides with the center line of the through hole of the first support plate 411; the second support plate 412 and the first support plate 411 are arranged parallel to each other, and the first surface of the second support plate 412 faces the first surface of the first support plate 411. The second support plate 412 is fixedly connected to three support columns 412; there is space from the second support plate 412 to the first support plate 411, and the loading assembly 42, the load balancing assembly 43 and the clamping assembly 44 are installed in sequence.

[0099] The loading assembly 42 includes a second actuating block 423 , a first actuating block 422 , a positioning sleeve 424 and a first spherical surface 421 .

[0100] The second actuating block 423 is annular, and is a stretching body with an annular cross section, and its inner diameter is larger than the outer diameter of the correction device 2, and its second end face is perpendicular to the center line of the annular ring, and this center line coincides with the center line of the through hole of the second support plate 413, and the second end face is attached to and fixedly connected with the first face of the second support plate 413, and the first end face is provided with three end face cams 4231 evenly distributed along the circumferential direction of the center line;

[0101] The first actuating block 422 is in the shape of a ring and is a stretched body of a ring cross-section, with an inner diameter larger than an outer diameter of the correction device 2, and the center line of the ring coincides with the center line of the through hole of the second support plate 412; the first end face of the first actuating block 422 faces the first end face of the second actuating block 423; the first end face of the first actuating block 422 is provided with three end face sliders 4221 evenly distributed along the circumferential direction of the center line; the second end face of the first actuating block 422 is a part of a sphere with the center on the center line, and the center of the sphere points to one side of the second end face on the center line, that is, the spherical surface is on the outer side of the ring instead of the inner side of the ring.

[0102] The positioning sleeve 424 is a thin-walled circular ring, which is a stretched body with a circular cross-section. A flange surface is provided at the second end, which is fitted and fixedly connected to the first surface of the second support plate 412. The center line of the positioning sleeve 424 coincides with the center line of the through hole of the second support plate 412; the second actuating block 423 and the first actuating block 422 are both located in the cylindrical space of the positioning sleeve 424, and there is an appropriate radial gap, which plays a role in positioning and supporting the first actuating block 422. The first actuating block 422 can rotate a certain angle and move axially relative to the second actuating block 423.

[0103] The end surface slider 4221 is a combination of an inclined surface and a flat surface, and the top is a flat surface; the end surface cam 4231 is a protrusion, and the end surface slider 4221 contacts the surface of the end surface cam 4231. When the first actuating block 422 rotates relative to the second actuating block 423, the end surface slider 4221 slides along the surface of the end surface cam 4231 to generate axial movement; Fig. 22 As shown, the end surface slider 4221 is located at the bottom of the end surface cam 4231, and the distance between the first actuating block 422 and the second actuating block 423 is the smallest. At this time, the loading assembly 42 is in a locked state with maximum displacement; Fig.23 As shown, the end face slider 4221 is located in the plane at the top of the end face cam 4231, and the distance between the first actuating block 422 and the second actuating block 423 is the largest and is in a clamping force maintaining state; further, the inclination angle of the end face cam can be designed to be large at first and then small, with a large slope in the initial climbing stage, which can provide a larger stroke to eliminate the mechanical and clamping gap, and a small slope in the latter stage, which can generate a larger clamping force to reduce the operating force of personnel.

[0104] In order to facilitate the driving of the first actuating block 422 to rotate, a long strip-shaped operating handle 4222 is fixedly connected to its outer circumference. Furthermore, one end of the operating handle is a spherical handle for holding, and the other end is a threaded head fixedly connected to the threaded hole on the side of the first actuating block 422. A pneumatic piston push rod can also be added to push and pull the operating handle 4222. Other power methods can also be used to drive the first actuating block 422 to rotate.

[0105] The load-balancing assembly 43 includes an actuating plate 432, a guide hole 433 and a second spherical surface 431. The actuating plate 432 is triangular in shape, and the middle part is a stretching body with a circular cross section. The center line of the circular ring coincides with the center line of the through hole of the first support plate 411. The first end of the stretching body with a circular cross section is provided with a second spherical surface 431, and the second spherical surface 431 and the first spherical surface 421 form a spherical pair; the actuating plate 432 extends three pressing plates in the radial direction, and the three pressing plates are evenly distributed around the center line, and their actuating surfaces face the first support plate 411; in order for the actuating plate 432 to maintain the required position and move along the center line, a long hole along the radial direction of the actuating plate 432, i.e., a guide hole 433, is provided on the side of each pressing plate; and it also includes a guide column parallel to the center line and fixedly connected to the first support plate 411 at one end, and three guide columns are evenly distributed along the circumference of the center line and inserted into the corresponding guide hole 433.

[0106] The clamping assembly 44 includes a first clamping body 441 , a second clamping body 442 and a clamping base 443 .

[0107] The clamping base 443 is fixedly connected to the first surface of the first support plate 411; the main body of the first clamping body 441 is slidably connected to the clamping base 443, and the sliding direction is along the radial direction of the central through hole of the first support plate 411; the first clamping body 441 is provided with a first clamping jaw 4411 on one side of the through hole of the first support surface 411, and the first clamping jaw 4411 extends toward the second surface of the first support plate 411, and the side of the first clamping jaw 4411 facing the clamping base 443 is the clamping surface.

[0108] The second clamping body 442 is swingably connected to the first clamping body 441, and the first end of the second clamping body 442 contacts the actuating surface of the actuating plate 432, and can slide along the actuating surface in the radial direction of the central through hole of the first support plate 411, and the second end of the second clamping body 442 is the second clamping jaw 4421, and the side surface of the second clamping jaw 4421 can contact the inner and outer surfaces of the tubular body 1 respectively with the first clamping jaw 4411. In more detail, the main body of the second clamping body 442 is in the shape of an elongated strip and the first end is rotatably connected to the actuating roller 4423, the axis of the actuating roller 4423 is perpendicular to the sliding direction of the first clamping body 441 and is parallel to the swing axis of the second clamping body 442 and the first clamping body 441; a support shaft 4422 is provided at the first end of the main body of the second clamping body 442, and its axis is the swing axis of the second clamping body 442 and the first clamping body 441; the second clamping jaw 4421 is provided at an obtuse angle to the main body of the second clamping body 442; and a protruding pattern is provided on the side of the second clamping jaw 4421 to prevent the clamped object from falling out.

[0109] In more detail, a linear bearing or a sliding dovetail groove or other structure may be provided between the clamping base 443 and the first clamping body 441; the main body of the first clamping body 441 is provided with a space for accommodating the assembly and swinging of the second clamping body 442, and this space is a through groove; the first clamping body 441 and the second clamping body 442 are provided with a support shaft hole 4412 in the area close to the first clamping jaw 4411, and the support shaft 4422 is installed in the support shaft hole 4412; the side of the first clamping jaw 4411 is provided with a protruding pattern to prevent the clamped object from falling out.

[0110] like Fig. 22 and 23 As shown, three clamping assemblies 44 are evenly distributed around the central through hole of the first support plate 411, and the first jaw 4411 and the second jaw 4421 of these clamping assemblies 44 are in the central through hole of the first support plate 411; when the end of the tubular body 1 is placed in the central through hole of the first support plate 411 and between the first jaw 4411 and the second jaw 4421, the loading assembly 42 is operated to push the load-balancing assembly 43 to move, and the load-balancing assembly 43 simultaneously applies displacement to each clamping assembly 44, so that the first jaw 4411 and the second jaw 4421 generate a clamping force, thereby clamping the wall of the end of the tubular body 1 to achieve its clamping.

[0111] When the wall at the end of the tubular body 1 is rusted, impurities or the wall thickness is changed to different specifications, the clamping position thickness of each clamping assembly 44 is different, and the distance between the first end of the second clamping body of the clamping assembly 44 and the first support plate 411 is different. At this time, the load-balancing assembly 43 will swing around the center of the spherical pair between the load-balancing assembly 43 and the loading assembly 42, so that the actuating plate 432 of the load-balancing assembly 43 can approximately evenly apply force to each clamping assembly 44, so that the clamping force generated by each first clamping jaw 4411 and the second clamping jaw 4421 is approximately equal. The above two approximations are due to the difference in the force arm caused by the swing, but it does not affect the clamping effect.

[0112] When the wall at the end of the tubular body 1 is deformed, placed unequally or switched to different diameter specifications, the first jaw 4411 and the second jaw 4421 of each clamping assembly 44 need to be in different radial positions. The first jaw 4411 is slidably connected to the base, and the second jaw 4421 can slide on the actuating surface of the actuating plate 432 to achieve the above-mentioned radial position change requirements.

[0113] When the loading assembly 42 is in the locked state of maximum displacement, the supporting assembly 44 generates the maximum clamping force to fix the tubular body 1; when the same or similar specifications (the wall thickness of the tubular body 1) are clamped in batches, the elastic deformation of the entire force-bearing assembly can adapt to the above-mentioned demand displacement fluctuations caused by the wall thickness fluctuations, that is, when the loading assembly 42 is in the locked state of maximum displacement, the thicker the wall thickness, the greater the clamping force, and the thinner the wall thickness, the smaller the clamping force, and the corresponding operating handle 4222 force is also positively correlated; when the tubular body 1 changes shape or the wall thickness of different tubular bodies 1 fluctuates, the wall thickness is so large that the operating handle 4222 cannot put the loading assembly 42 in the locked state of maximum displacement (the end face slider 4221 cannot climb to the plane at the top of the end face cam 4231), and the wall thickness is too thin to obtain sufficient clamping force, it is necessary to adjust the height of the support column 412, thereby adjusting the distance between the first clamping body 441 and the second clamping body 442, so as to generate a suitable clamping force when the loading assembly 42 is in the locked state of maximum displacement.

[0114] like Fig.24 As shown, when the clamping device 4 fixes the tubular body 1, the correction device 2 passes through the space formed by the first clamping jaws 4411 of the three clamping assemblies 44 and the central through hole of the first support plate 411.

[0115] The second embodiment of the clamping device 4 is as follows: Figures 25 to 30 shown.

[0116] Based on the first embodiment of the clamping device 4 , the clamping device 44 is changed into a structure in which the clamping force increases with the increase of the pulling force of the tubular body 1 .

[0117] The second clamping body 442 of the clamping device 44 is in the shape of an elongated strip, and a protrusion is arranged in the middle. This protrusion contacts the actuating surface of the actuating plate 432. Furthermore, this protrusion is the actuating roller 4423. The second end of the second clamping body 442 of the clamping device 44 is the second clamping jaw 4421, and its end face cooperates with the first clamping jaw 4411 to achieve clamping. The first end of the second clamping body 442 is swingably connected to the end of the first clamping body 441 away from the first clamping jaw 4411, and the first clamping jaw 4411 is changed into a U shape.

[0118] When the load-balancing assembly 43 is applied to push each clamping device 44 to clamp, the clamping force will increase with the increase of the pulling force of the tubular body 1, thereby improving the reliability of the fixed connection.

[0119] It should be noted that the above-mentioned embodiments are also applicable to tubular bodies 1 with square or other cross-sectional shapes.

[0120] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any combination, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pulling correction device for correcting a tubular body (1), characterized in that: It comprises a correction device (2), a traction device (3), a clamping device (4) and a bed (5); The bed (5) provides installation positions for the traction device (3) and the clamping device (4), and the area between the clamping device (4) and the traction device (3) is used to accommodate the tubular body (1) to be corrected; The clamping device (4) is fixedly connected to the first end of the tubular body (1) and is provided with a hole for accommodating the correction device (2) to pass through; The correction device (2) is in the shape of a long strip, and its head is connected to the traction device (3); The traction device (3) pulls the correction device (2) into the first end of the tubular body (1) and pulls it out from the second end of the tubular body (1); The correction device (2) is in the shape of a long strip, the head of which is a correction component (22) having the function of correcting the cross-sectional shape of the tubular body (1), and the tail of which is a straightening component (23) having the function of straightening the tubular body (1); The clamping device (4) comprises a support assembly (41), a loading assembly (42), a load-balancing assembly (43) and a certain number of clamping assemblies (44), the number being m, m being not less than 3, preferably 3; The support assembly (41) is fixedly connected to the bed (5); The loading component (42) is capable of generating a displacement, which acts on the load-balancing component (43). The load-balancing component (43) applies displacement to each clamping component (44), and makes the displacement of each clamping component (44) be in a respective maximum displacement state; The clamping assembly (44) is capable of clamping the wall of the tubular body (1) under the action of the load-balancing assembly (43); The clamping device (4) is provided with a space allowing the correction device (2) to pass through.

2. A pulling correction device according to claim 1, for correcting a tubular body (1), characterized in that: The support assembly (41) comprises a first support plate (411), a support column (412) and a second support plate (413); The first support plate (411) is roughly rectangular and has a through hole in the middle, wherein the inner diameter of the through hole is larger than the outer diameter of the tubular body (1); three load-balancing components (43) and three support columns (412) are evenly distributed and fixedly connected around the through hole on the first surface of the first support plate (411); the directions of all the support columns (412) are parallel to the normal direction of the first surface; the second surface of the first support plate (411) is in contact with the bed (5) and is fixedly connected thereto; The second support plate (412) is roughly triangular in shape, with a through hole in the middle, the center line of the through hole coincides with the center line of the through hole of the first support plate (411); the second support plate (412) and the first support plate (411) are arranged parallel to each other, the first surface of the second support plate (412) faces the first surface of the first support plate (411), and the second support plate (412) is fixedly connected to three support columns (412); there is a space between the second support plate (412) and the first support plate (411), and the loading assembly (42), the load balancing assembly (43) and the clamping assembly (44) are installed in sequence.

3. A pulling correction device according to claim 2, for correcting a tubular body (1), characterized in that: The loading assembly (42) comprises a second actuating block (423), a first actuating block (422), a positioning sleeve (424) and a first spherical surface (421); The second actuating block (423) is annular, the second end face is perpendicular to the center line of the annular ring, the center line coincides with the center line of the through hole of the second support plate (413), the second end face is attached to and fixedly connected to the first face of the second support plate (413), and the first end face is provided with three end face cams (4231) evenly distributed along the circumferential direction of the center line; The first actuating block (422) is annular, and the center line of the annular ring coincides with the center line of the through hole of the second support plate (412); the first end surface of the first actuating block (422) faces the first end surface of the second actuating block (423); the first end surface of the first actuating block (422) is provided with three end surface sliders (4221) evenly distributed along the circumferential direction of the center line; the second end surface of the first actuating block (422) is a part of a spherical surface with the center on the center line, and the center of the sphere points to one side of the second end surface at the center line, that is, the spherical surface is on the outer side surface of the annular ring instead of on the inner side surface of the annular ring; The positioning sleeve (424) is a stretched body with a circular cross-section, and the second end is fixedly connected to the first surface of the second support plate (412). The center line of the positioning sleeve (424) coincides with the center line of the through hole of the second support plate (412), and plays a role in positioning and supporting the first actuating block (422). The first actuating block (422) can rotate a certain angle and move axially relative to the second actuating block (423).

4. A pulling correction device according to claim 1, for correcting a tubular body (1), characterized in that: The end face slider (4221) is a combination of an inclined surface and a flat surface, and the top is a flat surface; The end face cam (4231) is a protrusion, and the end face slider (4221) contacts the surface of the end face cam (4231); the end face slider (4221) is located on the plane at the top of the end face cam (4231), and the distance between the first actuating block (422) and the second actuating block (423) is the largest and is in a clamping force holding state.

5. A pulling correction device according to claim 4, for correcting a tubular body (1), characterized in that: The inclination angle of the slope of the end face cam increases first and then decreases.

6. A pulling correction device according to claim 4, for correcting a tubular body (1), characterized in that: The outer peripheral surface of the first actuating block (422) is fixedly connected to a long strip-shaped operating handle (4222).

7. A pulling correction device according to claim 3, for correcting a tubular body (1), characterized in that: The load-balancing assembly (43) comprises an actuating plate (432), a guide hole (433) and a second spherical surface (431); The middle part of the actuating plate (432) is a stretching body with a circular cross section, the center line of the circular ring coincides with the center line of the through hole of the first support plate (411), a second spherical surface (431) is arranged at the first end of the stretching body with a circular cross section, and the second spherical surface (431) and the first spherical surface (421) form a spherical surface pair; The actuating plate (432) extends three pressing plates in the radial direction, and the three pressing plates are evenly distributed around the center line, and their actuating surfaces face the first supporting plate (411); Each pressing plate side is provided with a long hole (433) along the radial direction of the actuating plate (432); The guide posts are fixedly connected to the first support plate (411), and three guide posts are evenly distributed along the circumference of the center line and inserted into corresponding guide holes (433).

8. A pulling correction device according to claim 3, for correcting a tubular body (1), characterized in that: A clamping assembly (44), comprising a first clamping body (441), a second clamping body (442) and a clamping base (443); The clamping base (443) is fixedly connected to the first surface of the first support plate (411); the main body of the first clamping body (441) is slidably connected to the clamping base (443), and the sliding direction is along the radial direction of the central through hole of the first support plate (411); A first clamping jaw (4411) is provided on one side of the first clamping body (441) close to the through hole of the first supporting surface (411), and the first clamping jaw (4411) extends toward the second side of the first supporting plate (411), and the side of the first clamping jaw (4411) facing the clamping base (443) is a clamping surface. The second clamping body (442) is swingably connected to the first clamping body (441), the first end of the second clamping body (442) contacts the actuating surface of the actuating plate (432), and can slide along the actuating surface in the radial direction of the central through hole of the first support plate (411), the second end of the second clamping body (442) is a second clamping jaw (4421), and the side surface of the second clamping jaw (4421) and the first clamping jaw (4411) can respectively contact the inner and outer surfaces of the tubular body (1).

9. A pulling correction device according to claim 8, for correcting a tubular body (1), characterized in that: The main body of the second clamping body (442) is in the shape of an elongated strip, and the first end is rotatably connected to the actuating roller (4423). The axis of the actuating roller (4423) is perpendicular to the sliding direction of the first clamping body (441) and is parallel to the swing axis of the second clamping body (442) and the first clamping body (441). A support shaft 4422 is provided at the first end of the main body of the second clamping body (442), and its axis is the swing axis of the second clamping body (442) and the first clamping body (441). The second clamping jaw (4421) is provided at an obtuse angle to the main body of the second clamping body (442).

10. A pulling correction device according to claim 8, for correcting a tubular body (1), characterized in that: A clamping assembly (44), comprising a first clamping body (441), a second clamping body (442) and a clamping base (443); The clamping base (443) is fixedly connected to the first surface of the first support plate (411); the main body of the first clamping body (441) is slidably connected to the clamping base (443), and the sliding direction is along the radial direction of the central through hole of the first support plate (411); A first clamping jaw (4411) is provided on one side of the first clamping body (441) close to the through hole of the first supporting surface (411), the first clamping jaw (4411) extends in the direction of the second side of the first supporting plate (411), and the side of the first clamping jaw (4411) facing the clamping base (443) is a clamping surface; The second clamping body (442) of the clamping device (4) is in the shape of an elongated strip, and a protrusion is arranged in the middle part, and the protrusion contacts the actuating surface of the actuating plate (432); the second end of the second clamping body (442) of the clamping device (4) is a second clamping jaw (4421), and its end face cooperates with the first clamping jaw (4411) to achieve clamping, and the first end of the second clamping body (442) is swingably connected to an end of the first clamping body (441) away from the first clamping jaw (4411).

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