A grounding device for welding

Abstract

The present invention discloses a grounding device for welding, which is used to electrically connect a grounding wire to a welded pipe. The grounding device includes two conductive terminals for electrically contacting the pipe, and the grounding device also includes a deformation frame. The deformation frame includes a scissor-fork unit. The scissor-fork unit includes two connecting rods. The two connecting rods are rotatably connected through a middle shaft hinge. The distance from the middle shaft hinge to one end of the connecting rod is greater than the distance to the other end. The ends of the connecting rods of several scissor-fork units are rotatably connected to each other through end shaft hinges to form an arc-shaped deformation frame. The present invention arranges magnets and conductive terminals on the deformation frame, so that multiple magnets can be arranged into a contour consistent with the surface of the pipe, and adsorbed with the pipe at multiple positions, thereby improving adhesion, balancing the force, ensuring good contact between the conductive terminal and the pipe, and facilitating the adjustment of the position of the conductive terminal and the magnet along the circumference of the pipe.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a grounding device for welding. Background Art

[0002] In the process of pipeline welding, electric welding machines are needed. The current generated by electric welding machines is very large. If there is no grounding, the electrical energy cannot flow normally, which may easily cause leakage accidents and even pose a safety threat to welders.

[0003] In addition, the medium of the pipeline may also affect the transmission and distribution of current, so grounding can effectively reduce resistance and guide the current to flow smoothly to the ground, thereby ensuring welding safety. The main function of grounding welded parts is to protect the safety of equipment and personnel. It is mainly used to temporarily short-circuit and ground the equipment that has been powered off. Its functions are mainly reflected in the following aspects: Preventing sudden power supply to the equipment: When the high-voltage equipment is powered off for maintenance or other work, grounding can prevent sudden power supply to the equipment, thereby avoiding electric shock accidents; Avoiding the hazards of induced voltage: Grounding can prevent the induced voltage generated by adjacent high-voltage energized equipment from causing harm to the human body; Discharging the residual charge of the power-off equipment: Grounding can effectively discharge the residual charge of the power-off equipment, further ensuring work safety. The prior art usually clamps the ground wire clamp directly on the pipe, but as the welding position changes, it is sometimes necessary to adjust the grounding position of the workpiece, and this ground wire clamp is not conducive to flexible adjustment of the fixed position. Some prior art also uses magnetic attraction to fix the ground wire on the welded part. The principle is to set a magnet on the conductive terminal of the ground wire used for electrical connection with the workpiece, and use the magnetic force generated between the magnet and the workpiece to keep the conductive terminal in contact with the workpiece. When the position of the conductive terminal needs to be moved, just use force to separate the magnet from the workpiece and then adsorb the magnet to other positions of the workpiece. This method is more suitable for workpieces with a plane, but it is not conducive to the adsorption of the magnet for pipes with curved surfaces, resulting in insufficient adsorption force and a firm connection between the conductive terminal and the pipe. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a grounding device for welding.

[0005] The technical solution adopted by the present invention is to design a grounding device for welding, which is used to electrically connect a grounding wire to a welded pipe, the grounding device includes two conductive terminals for electrically contacting the pipe, and the grounding device also includes a deformation frame, the deformation frame includes a scissors-type unit, the scissors-type unit includes two connecting rods, the two connecting rods are rotatably connected by a middle shaft hinge, the distance from the middle shaft hinge to one end of the connecting rod is greater than the distance to the other end, the ends of the connecting rods of several of the scissors-type units are rotatably connected to each other by end shaft hinges to form an arc-shaped deformation frame, relative to the arc center of the deformation frame, the end shaft hinge located radially outside is the outer end shaft hinge, and the end shaft hinge located radially inside is the inner end shaft hinge, at least one of the inner end shaft hinges is provided with the conductive terminal, and at least two of the inner end shaft hinges are provided with magnets.

[0006] In certain embodiments, the conductive terminals are located between the magnets.

[0007] In some embodiments, the magnet is disposed on the conductive terminal.

[0008] In certain embodiments, a positioning sleeve is provided on the end shaft hinge, and two radially opposite positioning sleeves are telescopically matched with the same telescopic rod, and the conductive terminal and / or the magnet are provided at the end of the telescopic rod.

[0009] In some embodiments, the telescopic rod connected to the magnet is a screw rod, one of the two positioning sleeves sleeved on the screw rod is a screw sleeve and the other is a sliding sleeve, and the screw rod is threadedly matched with the screw sleeve.

[0010] In some embodiments, the telescopic rod connected to the conductive terminal is a smooth rod, the sliding sleeve is slidably sleeved on the smooth rod, and a return spring sleeved on the smooth rod is supported between the conductive terminal and the sliding sleeve.

[0011] In some embodiments, the screw rod is provided with stoppers located on both sides of the sliding sleeve.

[0012] In some embodiments, the positioning sleeve hingedly connected to the outer end shaft is the sliding sleeve.

[0013] In some embodiments, the magnet is disposed on a roller, and the roller is rotatably connected to the telescopic rod.

[0014] In some embodiments, the number of the conductive terminals is two, the two conductive terminals are respectively located at two ends of the deformation frame in the arc length direction, and the magnet is located on the inner end shaft hinge between the two conductive terminals.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges magnets and conductive terminals on a deformation frame, so that multiple magnets can be arranged into a contour consistent with the surface of the pipeline, and adsorbed to the pipeline at multiple positions, thereby improving the adhesion, making the force balanced, ensuring good contact between the conductive terminals and the pipeline, and facilitating the adjustment of the positions of the conductive terminals and the magnets along the circumference of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them: Figure 1 is a schematic diagram of the scissor unit.

[0017] Figure 2 It is a schematic diagram of embodiment 1.

[0018] Figure 3 It is a schematic diagram of the second embodiment.

[0019] Figure 4 It is a schematic diagram of embodiment 3.

[0020] In the figure, 1. pipeline; 2. conductive terminal; 3. connecting rod; 4. middle shaft hinge; 5. outer end shaft hinge; 6. inner end shaft hinge; 7. magnet; 8. screw; 9. screw sleeve; 10. sliding sleeve; 11. bare rod; 12. return spring; 13. stopper; 14. roller. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solutions of the invention.

[0022] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0023] Embodiment 1 like Figure 1 , 2As shown, a grounding device for welding is used to electrically connect a grounding wire to a welded pipe 1, the grounding device includes two conductive terminals 2 for electrically contacting the pipe 1, the grounding device also includes a deformation frame, the deformation frame includes a scissors-type unit, the scissors-type unit includes two connecting rods 3, the two connecting rods 3 are rotatably connected by a middle shaft hinge 4, the distance from the middle shaft hinge 4 to one end of the connecting rod 3 is greater than the distance to the other end, and the ends of the connecting rods 3 of several scissors-type units are rotatably connected to each other by end shaft hinges to form an arc-shaped deformation frame.

[0024] Relative to the arc center of the deformation frame, the end axis hinge located radially outside is the outer end axis hinge 5, and the end axis hinge located radially inside is the inner end axis hinge 6. At least one of the inner end axis hinges 6 is provided with the conductive terminal 2, and at least two of the inner end axis hinges 6 are provided with magnets 7.

[0025] According to the mechanism principle of the connecting rod 3, by changing the angle of the connecting rod 3, the deformation can be extended and retracted on the arc track. The position of the middle shaft hinge 4 is fixed relative to the connecting rod 3, and the corresponding radius of its arc track is a constant value, so that the deformation frame can be extended and retracted on a circular track coaxial with the pipeline 1. When deforming, it can ensure that the conductive end and the magnet 7 thereon are adjusted along the circumference of the pipeline 1, and the relative position of the pipeline 1 in the radial direction remains unchanged, and the spacing between all the inner end shaft hinges 6 is always the same. In this way, multiple magnets 7 can be simultaneously adsorbed to different positions of the pipeline 1, providing adhesion to the pipeline 1 and ensuring good contact between the conductive terminal 2 and the pipeline 1, that is, multiple magnets 7 of the grounding device can be arranged into a contour consistent with the surface of the pipeline 1, and adsorbed to the pipeline 1 at multiple positions, thereby improving adhesion and balancing the force.

[0026] The conductive terminal 2 may be located between the magnets 7, so that both sides of the conductive terminal 2 have an adsorption force, thereby preventing the conductive terminal 2 from moving. Alternatively, the magnet 7 may be disposed on the conductive terminal 2, that is, the conductive terminal 2 itself has magnetism.

[0027] The end shaft hinge is provided with a positioning sleeve, and two positioning sleeves opposite in the radial direction are telescopically matched with the same telescopic rod, and the conductive terminal 2 and / or the magnet 7 are arranged at the end of the telescopic rod. Specifically, in this embodiment, the telescopic rod connected to the magnet 7 is a screw 8, one of the two positioning sleeves sleeved on the screw 8 is a screw sleeve 9 and the other is a sliding sleeve 10, and the screw 8 is threadedly matched with the screw sleeve 9, so that by rotating the screw 8 relative to the screw sleeve 9, the magnet 7 can be controlled to be telescopically extended toward the pipe 1 in the radial direction, so as to adapt to the use of pipes 1 of different thicknesses, or to adapt to the use of pipes 1 of different cross-sections. For example, by making the telescopic amounts of the screw 8 at different positions different, it can also adapt to the use of elliptical pipes 1.

[0028] The telescopic rod connected to the conductive terminal 2 is a light rod 11, the sliding sleeve 10 is slidably sleeved on the light rod 11, and a return spring 12 sleeved on the light rod 11 is supported between the conductive terminal 2 and the sliding sleeve 10. The return spring 12 enables the conductive terminal 2 to have a pre-acting pressure on the pipeline 1.

[0029] In this embodiment, the number of the conductive terminals 2 is two, and the two conductive terminals 2 are respectively located at the two ends of the arc length direction of the deformation frame. The magnet 7 is located on the inner end shaft hinge 6 between the two conductive terminals 2, and the two conductive terminals 2 can achieve double grounding by welding.

[0030] Embodiment 2 like Figure 3 As shown, different from the above-mentioned embodiment, the screw rod 8 is provided with a stopper 13 located on both sides of the sliding sleeve 10, and the positioning sleeve connected to the outer end shaft hinge 5 is the sliding sleeve 10, so that the screw rod 8 can only rotate relative to the outer end shaft hinge 5 but cannot move radially relative thereto, and when the screw rod 8 rotates, the magnet 7 cannot be expanded or contracted in the radial direction, and the inner end shaft hinge 6 is close to or away from the outer end shaft hinge 5, thereby realizing the expansion and contraction adjustment of the deformation frame, thereby changing the circumferential position of the magnet 7 and the conductive terminal 2 on the pipeline 1, so as to meet different grounding needs.

[0031] Embodiment 3 like Figure 4 As shown, different from the above embodiment, the magnet 7 can be set on the roller 14, and the roller 14 is rotatably connected to the telescopic rod, that is, the screw 8, and the roller 14 can roll along the length direction of the pipeline 1, thereby adjusting the grounding position in the reverse direction along the length of the pipeline 1.

[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A grounding device for welding, used to electrically connect a grounding wire to a welded pipe, the grounding device comprising two conductive terminals for electrically contacting the pipe, characterized in that: The grounding device also includes a deformable frame, which includes a scissors-type unit, and the scissors-type unit includes two connecting rods, which are rotatably connected via a middle axis hinge, wherein the distance from the middle axis hinge to one end of the connecting rod is greater than the distance to the other end, and the ends of the connecting rods of several scissors-type units are rotatably connected to each other via end axis hinges to form an arc-shaped deformable frame, and relative to the arc center of the deformable frame, the end axis hinge located radially outside is the outer end axis hinge, and the end axis hinge located radially inside is the inner end axis hinge, at least one of the inner end axis hinges is provided with the conductive terminal, and at least two of the inner end axis hinges are provided with magnets.

2. The welding grounding device according to claim 1, characterized in that: The conductive terminals are located between the magnets.

3. The welding grounding device according to claim 1, characterized in that: The magnet is disposed on the conductive terminal.

4. The welding grounding device according to claim 1, characterized in that: A positioning sleeve is arranged on the end shaft hinge, and two positioning sleeves opposite to each other in radial direction are telescopically matched with the same telescopic rod, and the conductive terminal and / or the magnet are arranged at the end of the telescopic rod.

5. The welding grounding device according to claim 4, characterized in that: The telescopic rod connected to the magnet is a screw rod, one of the two positioning sleeves sleeved on the screw rod is a screw sleeve and the other is a sliding sleeve, and the screw rod is threadably matched with the screw sleeve.

6. The welding grounding device according to claim 5, characterized in that: The telescopic rod connected to the conductive terminal is a smooth rod, the sliding sleeve is slidably sleeved on the smooth rod, and a return spring sleeved on the smooth rod is supported between the conductive terminal and the sliding sleeve.

7. The welding grounding device according to claim 5, characterized in that: The screw rod is provided with blocking bodies located on both sides of the sliding sleeve.

8. The welding grounding device according to claim 7, characterized in that: The positioning sleeve hingedly connected to the outer end shaft is the sliding sleeve.

9. The welding grounding device according to claim 4, characterized in that: The magnet is arranged on the roller, and the roller is rotatably connected to the telescopic rod.

10. The welding grounding device according to claim 1, characterized in that: The number of the conductive terminals is two, and the two conductive terminals are respectively located at two ends of the deformation frame in the arc length direction, and the magnet is located on the inner end shaft hinge between the two conductive terminals.

Images