Metal pipe welding clamping device

Abstract

The invention discloses a metal pipe welding clamping device, and relates to the technical field of pipe welding. By the adoption of the clamping electric cylinder, the adjusting electric cylinder and detection, precise alignment and parallel control of the end faces of the pipes are achieved. According to the device, a pipe is stably fixed through the clamping electric cylinder, the end face parallelism is adjusted through the adjusting electric cylinder, a user can more visually detect the included angle and the alignment condition of the welding end face through the shading paper piece and the image sensor, and the welding quality is ensured. The design of the device has high precision, high efficiency and high safety, reduces the difficulty of manual operation, and is particularly suitable for welding operation with strict requirements.

Description

Technical Field

[0001] The invention relates to the technical field of pipe welding, in particular to a metal pipe welding clamping device. Background Art

[0002] At present, in the field of metal pipe welding, manual clamping tools or some semi-automatic equipment are usually used to fix the pipes. However, the existing technology generally has the following shortcomings: the clamping accuracy is not high. The traditional clamping device relies on manual adjustment, which easily causes the pipe to be loosely fixed, resulting in displacement of the pipe during the welding process, thereby affecting the welding quality; the end face alignment is difficult. For large-diameter metal pipes, especially under high-precision welding requirements, the end face alignment problem is more prominent. Traditional equipment cannot accurately adjust the end face parallelism of the pipe, resulting in errors during welding, affecting the quality of the welded joint. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a metal pipe welding clamping device, comprising two symmetrically arranged clamping parts, the clamping part comprising a bottom clamping arc frame, one side of the bottom clamping arc frame is movably mounted with a top clamping arc frame through a hinge, the top clamping arc frame and the bottom clamping arc frame form a circular frame, wherein a clamping electric cylinder is fixed on the top clamping arc frame, and two clamping electric cylinders are fixed on the bottom clamping arc frame, and the axes of the telescopic rods of all the clamping electric cylinders point to the center of the circular frame, which is used for clamping the metal pipe. The bottom clamping arc frame is clamped; a movable connecting ball head is fixed at the bottom center position of the bottom clamping arc frame, and the bottom clamping arc frame is movably installed on the clamping platform plate through the movable connecting ball head, and the clamping platform plates in the two clamping parts are arranged without contacting each other; a plurality of lifting slide rod columns are fixedly installed on the lower surface of the clamping platform plate, and the lifting slide rod columns are slidably plugged on the base; two parallel and symmetrically arranged adjusting electric cylinders are installed on each clamping platform plate in a movable connection manner of a ball pair, and the ends of the telescopic rods of the two adjusting electric cylinders are movably connected to the bottom clamping arc frame in a ball pair.

[0004] Preferably, a fitting block is fixedly mounted on the end of the telescopic rod of the clamping electric cylinder in a manner that is easy to disassemble, and the fitting block is in contact with and fits with the surface of the metal pipe.

[0005] Preferably, a sliding pin is fixed in the middle of the side edge of the clamping platform plate, and symmetrically arranged avoidance inclined grooves are provided on the sides of the base. A swing bracket is fixed in the middle of the avoidance inclined grooves, and a swing arm is rotatably mounted on the swing bracket. Two slide rail grooves are symmetrically provided on the swing arm, and the two clamping platform plates in the clamping part are slidably arranged in the two slide rail grooves.

[0006] Preferably, a swing electric cylinder is fixed to the side of the base, a rack is fixed to the end of the telescopic rod of the swing electric cylinder, and a gear is rotatably arranged on the swing bracket. The gear and the swing arm are fixed as a whole through a rotating shaft, and the gear and the rack are meshed for transmission; a protective cover shell is provided on the outer side of the swing electric cylinder, the rack and the gear, and the protective cover shell is fixed on the side of the base.

[0007] Preferably, a rotating shading tube bracket is fixed to the side of the protective cover shell or the base away from the protective cover shell in an easy-to-disassemble manner, and a rotating shading tube is rotatably mounted on the rotating shading tube bracket. The rotating shading tube and the rotating shading tube bracket adopt a damped rotating cooperation manner.

[0008] Preferably, a groove is provided in the middle portion of the rotating light-shielding cylinder, a light-shielding paper swing arm is fixedly installed on the outer surface of the rotating light-shielding cylinder, a swing extension rod is fixedly installed on the light-shielding paper swing arm, a rotating disk is rotatably installed on the swing extension rod, a pin is provided at the center position of the rotating disk, a light-shielding paper is sleeved on the pin, a magnetic pressure block is also provided on the side of the light-shielding paper, the magnetic pressure block cooperates with the magnetic force of the rotating disk, and is used to fix the light-shielding paper on the rotating disk, wherein the magnetic pressure block is sleeved on the pin.

[0009] Preferably, an inner light-shielding tube and a light receiving cover are fixedly installed on both sides of the groove on the inner wall of the rotating light-shielding tube, wherein a spacing is provided between the inner light-shielding tube and the light-receiving cover, a light-shielding ring is fixed on the end of the inner light-shielding tube facing the light-receiving cover, an LED light-emitting module is fixed on the end of the inner light-shielding tube away from the light-receiving cover, and a light-distributing plate is fixed between the LED light-emitting module and the light-shielding ring.

[0010] Preferably, a sealing support plate is fixed to one end of the light receiving cover away from the inner light-shielding tube, and an image sensor is fixedly installed at the center position of one surface of the sealing support plate inside the light receiving cover. A focusing lens is also fixed on the inner wall of the light receiving cover, and the focusing lens is used to focus part of the light emitted by the LED light-emitting module onto the image sensor.

[0011] Preferably, the ends of the top clamping arc frame and the bottom clamping arc frame away from the hinge are fixed by locking screws, wherein a gasket is provided between the ends of the bottom clamping arc frame and the top clamping arc frame away from the hinge.

[0012] Preferably, two conductive magnetic suction heads are further included, each of which is fixed on one end of the wire, and the conductive magnetic suction head is in contact with the metal pipe for conductive cooperation.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can accurately clamp the two ends of the metal pipe to ensure that the welding end faces are aligned and avoid deviations caused by loose clamping. By controlling the extension and contraction of the clamping electric cylinder, the metal pipe can be firmly fixed between the top clamping arc frame and the bottom clamping arc frame. This can effectively improve the accuracy of the welding process and ensure the quality of pipe welding; (2) The present invention has an adjustable electric cylinder, which can accurately adjust the parallelism of the welding end faces of the two pipes before welding. By adjusting the extension and contraction of the electric cylinder, the synchronous movement of the top and bottom clamping arc frames can be achieved to ensure that the welding end faces are parallel, reduce welding errors, and thus improve the quality and effect of welding; (3) The present invention can conveniently observe the arc distribution by rotating the light shielding tube bracket and the operation of generating an arc with high voltage electricity, ensuring that the angle and alignment problems of the two end faces are corrected in time; (4) The present invention can be flexibly adjusted according to different pipe sizes, and the structural design is compact and can adapt to various site environments. Even when faced with pipes of different diameters, it can be quickly adapted, and the operation process is simple, which makes it easy for workers to quickly get started and improves production efficiency. (5) The combination of the shading paper and the image sensor in the present invention can facilitate users to more intuitively detect the alignment of the pipe welding end faces, reducing the overall difficulty of entry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a structural schematic diagram of the swing extension rod of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of the protective cover shell of the present invention.

[0017] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0018] Figure 5 It is a structural schematic diagram of the lifting slide rod column of the present invention.

[0019] Figure 6 It is a structural schematic diagram of the locking screw of the present invention.

[0020] Figure 7 It is a schematic diagram of the structure of the rotating light-shielding cylinder of the present invention.

[0021] Figure 8 It is a structural schematic diagram of the magnetic suction pressure block of the present invention.

[0022] Fig. 9 It is a schematic diagram of the internal structure of the light receiving cover of the present invention.

[0023] In the figure: 101-base; 102-avoidance inclined slot; 103-swing bracket; 104-lifting slide rod column; 105-clamping platform plate; 106-protective cover shell; 107-adjusting electric cylinder; 108-swinging electric cylinder; 109-rack; 110-gear; 111-swing arm; 112-sliding pin; 113-slide rail groove; 114-bottom clamping arc frame; 115-clamping electric cylinder; 116-fitting block; 117-hinge; 118-movable connecting ball head; 119-locking screw; 12 0-gasket; 121-top clamping arc frame; 122-conductive magnetic suction head; 123-image sensor; 124-light-shielding paper; 125-rotating disk; 126-swinging extension rod; 127-light-shielding paper swing arm; 128-magnetic pressure block; 129-rotating light-shielding cylinder; 130-rotating light-shielding cylinder bracket; 131-inner light-shielding cylinder; 132-light receiving cover; 133-LED light-emitting module; 134-diffusion plate; 135-focusing lens; 136-sealing support plate; 137-light-shielding ring. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-Figure 9 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0025] The present invention provides a metal pipe welding clamping device, comprising two symmetrically arranged clamping parts, the clamping part comprising a bottom clamping arc frame 114, one side of the bottom clamping arc frame 114 is movably mounted with a top clamping arc frame 121 through a hinge 117, the top clamping arc frame 121 and the bottom clamping arc frame 114 form a circular frame, wherein a clamping electric cylinder 115 is fixed on the top clamping arc frame 121, and two clamping electric cylinders 115 are fixed on the bottom clamping arc frame 114, and the axes of the telescopic rods of all the clamping electric cylinders 115 point to the center of the circular frame, so as to clamp the metal pipe; wherein the bottom clamping arc frame 11 4 is fixed with an active connection ball head 118 at the bottom center, and the bottom clamping arc frame 114 is movably installed on the clamping platform plate 105 through the active connection ball head 118, and the clamping platform plates 105 in the two clamping parts are arranged without contacting each other; a plurality of lifting slide rods 104 are fixedly installed on the lower surface of the clamping platform plate 105, and the lifting slide rods 104 are slidably plugged on the base 101; two parallel and symmetrically arranged adjusting electric cylinders 107 are installed on each clamping platform plate 105 in an active connection manner of a ball pair, and the ends of the telescopic rods of the two adjusting electric cylinders 107 are connected to the bottom clamping arc frame 114 in an active manner of a ball pair. The ends of the telescopic rods of the clamping electric cylinders 115 are fixedly installed with a fitting block 116 in a manner that is easy to disassemble, and the fitting block 116 contacts and cooperates with the surface of the metal pipe. A sliding pin 112 is fixed to the middle of the side edge of the clamping platform plate 105, and a symmetrically arranged avoidance inclined groove 102 is provided on the side of the base 101. A swing bracket 103 is fixed to the middle of the avoidance inclined groove 102. A swing arm 111 is rotatably mounted on the swing bracket 103. Two slide rail grooves 113 are symmetrically provided on the swing arm 111, wherein the two clamping platform plates 105 in the clamping part are slidably arranged in the two slide rail grooves 113. A swing electric cylinder 108 is fixed to the side of the base 101, and a rack 109 is fixed to the end of the telescopic rod of the swing electric cylinder 108. A gear 110 is also rotatably arranged on the swing bracket 103. The gear 110 and the swing arm 111 are fixed as a whole through a rotating shaft, wherein the gear 110 and the rack 109 are meshed for transmission; a protective cover 106 is sleeved on the outer side of the swing electric cylinder 108, the rack 109, and the gear 110, and the protective cover 106 is fixed to the side of the base 101.

[0026] A rotating shading tube bracket 130 is fixed to the side of the protective cover shell 106 or the base 101 away from the protective cover shell 106 in an easy-to-remove manner. A rotating shading tube 129 is rotatably mounted on the rotating shading tube bracket 130. The rotating shading tube 129 and the rotating shading tube bracket 130 adopt a damped rotational cooperation manner. A groove is provided in the middle of the rotating light-shielding cylinder 129, and a light-shielding paper swing arm 127 is fixedly installed on the outer surface of the rotating light-shielding cylinder 129, and a swing extension rod 126 is fixedly installed on the light-shielding paper swing arm 127, and a rotating disk 125 is rotatably installed on the swing extension rod 126. A pin is provided at the center of the rotating disk 125, and a light-shielding paper 124 is sleeved on the pin. A magnetic pressure block 128 is also provided on the side of the light-shielding paper 124, and the magnetic pressure block 128 cooperates with the rotating disk 125 magnetically for fixing the light-shielding paper 124 on the rotating disk 125, wherein the magnetic pressure block 128 is sleeved on the pin. On the inner wall of the rotating light-shielding cylinder 129, an inner light-shielding cylinder 131 and a light receiving cover 132 are fixedly installed on both sides of the groove, wherein a spacing is provided between the inner light-shielding cylinder 131 and the light receiving cover 132, a light-shielding ring 137 is fixed to the end of the inner light-shielding cylinder 131 facing the light receiving cover 132, an LED light-emitting module 133 is fixed to the end of the inner light-shielding cylinder 131 away from the light receiving cover 132, and a light-shielding plate 134 is fixed between the LED light-emitting module 133 and the light-shielding ring 137. A sealing support plate 136 is fixed to the end of the light receiving cover 132 away from the inner light-shielding cylinder 131, and an image sensor 123 is fixedly installed on the sealing support plate 136 at the center position of one side inside the light receiving cover 132, and a focusing lens 135 is also fixed to the inner wall of the light receiving cover 132, and the focusing lens 135 is used to focus part of the light emitted by the LED light-emitting module 133 onto the image sensor 123. The top clamping arc frame 121 and the end of the bottom clamping arc frame 114 away from the hinge 117 are fixed by a locking screw 119, wherein a gasket 120 is provided between the end of the bottom clamping arc frame 114 and the end of the top clamping arc frame 121 away from the hinge 117.

[0027] The invention also includes two conductive magnetic suction heads 122 . Each conductive magnetic suction head 122 is fixed to one end of the wire. The conductive magnetic suction head 122 is in contact with the metal pipe for electrical conduction.

[0028] The rotating sunshade tube bracket 130 (and all parts on it) can be installed in different positions according to the site conditions, but it is necessary to ensure that the seams of the two pipes are in the same plane with the sunshade paper 124. When in use, it is necessary to open the top clamping arc frame 121 from the bottom clamping arc frame 114 (rotate along the hinge 117), overlap one end of the pipe on the two fitting blocks 116 on the bottom clamping arc frame 114 (replace the appropriate fitting blocks 116 as needed to fit the pipe surface), and then buckle the top clamping arc frame 121 on the bottom clamping arc frame 114, use a wrench to rotate the locking screw 119, so that the top clamping arc frame 121 and the bottom clamping arc frame 114 are fixed, and control the three clamping electric cylinders 115 to adapt to the diameter of the pipe to ensure that the pipe is at the center of the circular frame formed by the top clamping arc frame 121 and the bottom clamping arc frame 114. When welding, it is necessary to ensure that the welding end faces of the pipes at both ends are aligned. The alignment method is to control the swing electric cylinder 108 so that the two welding end faces are at the same height. The telescopic rod of the swing electric cylinder 108 drives the rack 109 to move, and the rack 109 drives the gear 110 to rotate. The rotation of the gear 110 drives the swing arm 111 to rotate and swing. The rotation of the swing arm 111 will drive the sliding pin 112 to swing through the slide rail groove 113. Since the sliding pin 112 is fixed on the clamping platform plate 105, the clamping platform plate 105 slides along the height direction of the base 101 by lifting the slide rod column 104, thereby driving the clamping platform plate 105 to move up and down. At this time, the sliding pin 112 will also slide in the slide rail groove 113 to adjust the relative height of the two clamping platform plates 105 so that their welding end faces are aligned.

[0029] According to welding requirements, it is sometimes necessary to ensure the parallelism of the welding end faces to ensure the quality of welding. At this time, the two adjusting electric cylinders 107 on each clamping platform plate 105 can be controlled. The simultaneous extension and retraction of the two adjusting electric cylinders 107 will drive the top clamping arc frame 121 and the bottom clamping arc frame 114 to swing up and down on the clamping platform plate 105 (nodding action), which can also control the synchronous movement of the welding end faces; if one of the two adjusting electric cylinders 107 is retracted and the other is extended, the top clamping arc frame 121 and the bottom clamping arc frame 114 will be controlled to rotate and swing in the height direction of the clamping platform plate 105 (shaking head action), which can also control the synchronous movement of the welding end faces. The specific movement amount of the telescopic rod of the adjusting electric cylinder 107 needs to be directly adjusted according to the experience of the operator. Alternatively, the shading paper 124 is installed on the rotating disk 125, and the shading paper 124 is set between the rotating disk 125 and the magnetic pressure block 128, and then the shading paper swing arm 127 is driven to swing by the swing extension rod 126, and the shading paper swing arm 127 swings along the axis of the rotating shading cylinder 129, so that the shading paper 124 is inserted between the welds. The two conductive magnetic suction heads 122 are attached to the surfaces of the two pipes (as close to the weld position as possible). Generally, the conductive magnetic suction heads 122 can be directly magnetically attracted to the surface of the pipe, or attached with tape. Apply high voltage between the two conductive magnetic suction heads 122 (using a high voltage generator, input voltage 3-6V, powered by a single 18650 battery, easy to carry), and make the two pipes charged by conduction. At this time, an arc will be generated between the two welding end faces (inside the weld), and the arc will break through the shading paper 124, and holes will be generated on the shading paper 124. If the two welding end faces are completely parallel, the arc generated at this time is evenly distributed (as evenly as possible), and multiple arcs will be formed. The multiple arcs form a circle, so the multiple arcs will break through the shading paper 124, so the holes generated on the shading paper 124 will be distributed in a circle. If there is an angle between the two welding end faces, the arc will be concentrated at the position where the end faces are closest to each other, so the holes generated on the shading paper 124 will not be distributed in a circle. After applying high voltage to the conductive magnetic suction head 122, the power is turned off (the operator should not touch the pipe and its conductive objects during the power-on process; it should be noted that the voltage of the high-voltage generator is very high but the current is very low, and will not cause harm to the human body), the shading paper 124 is rotated, and the part just located between the welds is rotated into the rotating shading cylinder 129, and the LED light-emitting module 133 is energized. The light emitted by the LED light-emitting module 133 will pass through the light-homogenizing plate 134, then pass through the shading ring 137, and then pass through the holes generated on the shading paper 124, and then the focusing lens 135 will focus the light onto the image sensor 123 (the image sensor 123 is connected to the display screen). At this time, the distribution of the holes generated on the shading paper 124 can be more easily observed. According to the distribution of the holes, the angle between the two welding end faces can be known, and then the control and adjustment electric cylinder 107 is controlled to adjust.After the adjustment is completed, repeat the above steps again until the two welding end faces are adjusted to be parallel. Finally, swing the shading paper swing arm 127 by swinging the extension rod 126, swing the shading paper 124 to a far away position, and then remove the rotating shading tube bracket 130 from the protective cover shell 106 or the base 101. The end face of the pipe is welded and fixed.

Claims

1. A metal pipe welding clamping device, characterized in that: The clamping device comprises two symmetrically arranged clamping parts, the clamping parts comprising a bottom clamping arc frame (114), one side of the bottom clamping arc frame (114) being movably mounted with a top clamping arc frame (121) via a hinge (117), the top clamping arc frame (121) and the bottom clamping arc frame (114) forming a circular frame, wherein a clamping electric cylinder (115) is fixed on the top clamping arc frame (121), and two clamping electric cylinders (115) are fixed on the bottom clamping arc frame (114), and the axes of the telescopic rods of all the clamping electric cylinders (115) point to the center of the circular frame, so as to clamp the metal pipe; A movable connecting ball head (118) is fixed at the bottom center position of the bottom clamping arc frame (114), and the bottom clamping arc frame (114) is movably mounted on the clamping platform plate (105) through the movable connecting ball head (118), and the clamping platform plates (105) in the two clamping parts are arranged without contacting each other; a plurality of lifting slide rod columns (104) are fixedly mounted on the lower surface of the clamping platform plate (105), and the lifting slide rod columns (104) are slidably plugged on the base (101); two parallel and symmetrically arranged adjusting electric cylinders (107) are installed on each clamping platform plate (105) in a movable connection manner of a ball pair, and the ends of the telescopic rods of the two adjusting electric cylinders (107) are movably connected to the bottom clamping arc frame (114) in a ball pair.

2. A metal pipe welding clamping device according to claim 1, characterized in that: The end of the telescopic rod of the clamping electric cylinder (115) is fixedly mounted with a fitting block (116) in a manner that is easy to disassemble, and the fitting block (116) is in contact with the surface of the metal pipe.

3. A metal pipe welding clamping device according to claim 2, characterized in that: A sliding pin (112) is fixed in the middle of the side edge of the clamping platform plate (105), and the side of the base (101) is provided with symmetrically arranged avoidance inclined grooves (102). A swing bracket (103) is fixed in the middle of the avoidance inclined grooves (102). A swing arm (111) is rotatably mounted on the swing bracket (103), and two slide rail grooves (113) are symmetrically provided on the swing arm (111), wherein the two clamping platform plates (105) in the clamping part are slidably arranged in the two slide rail grooves (113).

4. A metal pipe welding clamping device according to claim 3, characterized in that: A swing electric cylinder (108) is fixed to the side of the base (101), a rack (109) is fixed to the end of the telescopic rod of the swing electric cylinder (108), a gear (110) is rotatably arranged on the swing bracket (103), the gear (110) and the swing arm (111) are fixed as a whole via a rotating shaft, wherein the gear (110) and the rack (109) are meshed for transmission; a protective cover shell (106) is sleeved on the outer side of the swing electric cylinder (108), the rack (109) and the gear (110), and the protective cover shell (106) is fixed to the side of the base (101).

5. A metal pipe welding clamping device according to claim 4, characterized in that: A rotating light-shielding tube bracket (130) is fixed to a side of the protective cover shell (106) or the base (101) away from the protective cover shell (106) in a manner that is easy to disassemble. A rotating light-shielding tube (129) is rotatably mounted on the rotating light-shielding tube bracket (130). The rotating light-shielding tube (129) and the rotating light-shielding tube bracket (130) are rotatably matched in a damping manner.

6. A metal pipe welding clamping device according to claim 5, characterized in that: A groove is provided in the middle of the rotating light-shielding cylinder (129); a light-shielding paper swing arm (127) is fixedly mounted on the outer surface of the rotating light-shielding cylinder (129); a swing extension rod (126) is fixedly mounted on the light-shielding paper swing arm (127); a rotating disk (125) is rotatably mounted on the swing extension rod (126); a pin is provided at the center of the rotating disk (125); a light-shielding paper (124) is sleeved on the pin; a magnetic pressure block (128) is further provided on the side of the light-shielding paper (124); the magnetic pressure block (128) cooperates with the rotating disk (125) by magnetic force and is used to fix the light-shielding paper (124) on the rotating disk (125); wherein the magnetic pressure block (128) is sleeved on the pin.

7. A metal pipe welding clamping device according to claim 6, characterized in that: An inner light-shielding tube (131) and a light receiving cover (132) are fixedly mounted on both sides of the groove on the inner wall of the rotating light-shielding tube (129), wherein a spacing is provided between the inner light-shielding tube (131) and the light receiving cover (132), a light-shielding ring (137) is fixed to one end of the inner light-shielding tube (131) facing the light receiving cover (132), an LED light-emitting module (133) is fixed to one end of the inner light-shielding tube (131) away from the light receiving cover (132), and a light-dispersing plate (134) is fixed between the LED light-emitting module (133) and the light-shielding ring (137).

8. The metal pipe welding clamping device according to claim 7, characterized in that: A sealing support plate (136) is fixed to one end of the light receiving cover (132) away from the inner light shielding tube (131); an image sensor (123) is fixedly mounted on the sealing support plate (136) at a central position on one surface inside the light receiving cover (132); a focusing lens (135) is also fixed to the inner wall of the light receiving cover (132); the focusing lens (135) is used to focus part of the light emitted by the LED light-emitting module (133) onto the image sensor (123).

9. A metal pipe welding clamping device according to claim 8, characterized in that: The ends of the top clamping arc frame (121) and the bottom clamping arc frame (114) away from the hinge (117) are fixed by means of locking screws (119), wherein a gasket (120) is provided between the ends of the bottom clamping arc frame (114) and the top clamping arc frame (121) away from the hinge (117).

10. The metal pipe welding clamping device according to claim 9, characterized in that: It also includes two conductive electromagnetic suction heads (122), each of which is fixed to one end of the wire, and the conductive electromagnetic suction head (122) is in contact with the metal pipe for conductive cooperation.

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