Welding ground wire double-grounding device

Abstract

The utility model discloses a welding ground wire double-grounding device, which is used for symmetrically and electrically connecting two grounding leads to a welded pipeline, and comprises two wiring terminals for electrically contacting with the pipeline and a parallel four-bar mechanism, the parallel four-rod mechanism comprises four connecting rods and four shaft hinges, the two wiring terminals are arranged on the two opposite shaft hinges respectively, the other two opposite shaft hinges are connected through a telescopic assembly, and the telescopic assembly controls the distance between the two shaft hinges. According to the welding double-grounding device, on the basis of the double-guarantee concept, two independent grounding paths are arranged in a welding system to disperse high-voltage inrush current possibly occurring in a ground wire, it is ensured that welding current has two balanced loop paths, welding induction current is prevented from being concentrated in a single path, the welding quality problem or equipment damage is avoided, and the welding quality is improved. And the risks of unstable welding and equipment damage caused by ground wire potential difference are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding technical field especially relates to a welding ground wire double grounding device. BACKGROUND

[0002] In the pipeline welding process, electric welding needs to use the electric welding machine. The current generated by the electric welding machine is very large, and if there is no grounding, the electrical energy cannot flow normally, which can easily cause an electric shock accident, and even can cause a safety threat to the welder.

[0003] In addition, the medium of the pipeline can also affect the transmission and distribution of the current, so grounding can effectively reduce the resistance and guide the current to flow smoothly to the ground, thereby ensuring the safety of welding.

[0004] The main function of the welding grounding is to protect the equipment and personnel safety, and is mainly used for temporarily short-circuiting the grounded equipment after power failure. Its functions mainly reflect in the following aspects: preventing sudden power supply of the equipment: when the high-voltage equipment is powered off for maintenance or other work, grounding can prevent sudden power supply of the equipment, thereby avoiding electric shock accidents; avoiding the harm of induced voltage: grounding can avoid the harm of induced voltage of the adjacent high-voltage live equipment to the human body; discharging the residual charge of the powered-off equipment: grounding can effectively discharge the residual charge of the powered-off equipment, further ensuring the safety of work.

[0005] For some special material pipes, the protection of the pipes is particularly important. The ordinary welding grounding device adopts the common ground clamp on the market, and a single ground clamp is directly clamped on the pipe, which can easily produce electric sparks to scratch the pipe, and a single ground clamp cannot meet the grounding requirements during the welding process of thick-walled pipes. INVENTION CONTENTS

[0006] To solve the above at least one technical problem, the utility model provides a welding ground wire double grounding device.

[0007] The utility model adopts the technical scheme that designs a welding ground wire double grounding device for electrically connecting two grounding wires symmetrically on the welded pipeline, the double grounding device includes two wiring terminals for electrically contacting the pipeline, the double grounding device further includes a parallelogram mechanism, the parallelogram mechanism includes four connecting rods and four shaft hinges, the two wiring terminals are respectively arranged on the opposite two shaft hinges, the other two opposite shaft hinges are connected through a telescopic assembly, and the telescopic assembly controls the distance between the two shaft hinges.

[0008] In some embodiments, the telescopic assembly includes a bolt, one end of the bolt is connected with one of the shaft hinges, and the other shaft hinge is in sliding connection with the bolt.

[0009] In some embodiments, a sliding sleeve is arranged on the shaft hinge and sleeved on the bolt.

[0010] In some embodiments, the telescopic assembly comprises a screw rod, the screw rod is rotationally connected with one of the shaft hinges through a rotation connecting mechanism, and the other shaft hinge is provided with a screw sleeve which is threadedly matched with the screw rod.

[0011] In some embodiments, the rotation connecting mechanism comprises a shaft sleeve which is connected with the hinge shaft of the shaft hinge, the screw rod is rotationally matched with the shaft sleeve, and the screw rod is provided with a stopper on both sides of the shaft sleeve.

[0012] In some embodiments, the end of the screw rod is provided with a hexagonal end.

[0013] In some embodiments, each of the shaft hinges is rotationally connected with a positioning rod, adjacent positioning rods are connected through a rod body which is parallel with the connecting rod, the rod body is rotationally connected with the positioning rod through a shaft hinge, and adjacent rod bodies are connected with the positioning rod through the same shaft hinge.

[0014] In some embodiments, the wiring terminal is arranged on the positioning rod.

[0015] In some embodiments, the wiring terminal is a strip body, and the positioning rod is connected at one end of the strip body.

[0016] In some embodiments, the cross section of the strip body is arc-shaped.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The welding double grounding device is based on the concept of "double protection", two independent grounding paths are arranged in the welding system, high voltage inrush current possibly appearing in the ground wire is dispersed, it is ensured that there are two balanced loop paths for the welding current, welding induced current is avoided from being concentrated in a single path, welding quality problems or equipment damage are avoided, and welding instability and equipment damage risks caused by ground potential difference are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be explained in detail below in combination with specific embodiments and drawings, in order to show details, facilitate understanding its principle, it is not necessarily drawn in proportion, similar reference signs can be described similar parts in different views. The drawings generally show the embodiments discussed herein in an example rather than limiting manner. Among them:

[0020] Figure 1 It is the schematic drawing of example one.

[0021] Figure 2 It is the schematic drawing of example two.

[0022] In the drawing, 1, first shaft hinge;2, second shaft hinge;3, third shaft hinge;4, fourth shaft hinge;5, pipeline;6, terminal;7, connecting rod;8, bolt;9, nut;10, sliding sleeve;11, positioning rod;12, rod body;13, screw;14, screw sleeve;15, shaft sleeve;16, stop body;17, ground wire;18, hexagonal end. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the utility model, and the technical scheme of the utility model is further described in combination with the drawings, but the utility model is not limited to these embodiments, the following implementation ways do not limit the utility model involved in the claims. In addition, all combinations of the features explained in the implementation ways are not necessarily necessary for the solution of the utility model.

[0024] The principle and structure of the utility model will be explained in detail below in combination with the drawings and embodiments.

[0025] Example 1

[0026] like Figure 1 As shown, a double grounding device for welding ground wires is used to symmetrically electrically connect two grounding conductors to the welded pipe 5. The double grounding device includes two metal terminals 6 for electrical contact with the pipe 5, each of which is connected to an independent grounding wire 17. The double grounding device also includes a parallel four-bar linkage, which includes four links 7 and four hinges. For ease of explanation, the four hinges are defined as first hinge 1, second hinge 2, third hinge 3, and fourth hinge 4. The two terminals 6 are respectively disposed on two opposite hinges. In this embodiment, the two terminals 6 are respectively disposed on the first hinge 1 and the second hinge. On hinge 2, the third-axis hinge 3 and the fourth-axis hinge 4 are connected by a telescopic assembly. The telescopic assembly controls the distance between the third-axis hinge 3 and the fourth-axis hinge 4, thereby indirectly controlling the distance between the first-axis hinge 1 and the second-axis hinge 2, and thus controlling the distance between the two terminals 6. In use, the end of the parallel four-bar linkage can be placed into the pipe 5 to be welded, and then the first-axis hinge 1 and the second-axis hinge 2 are moved away from each other, so that the two terminals 6 are supported and fixed on the inner wall of the pipe 5, thereby grounding two symmetrical parts of the pipe 5 simultaneously, and also realizing the fixed connection of the double grounding device relative to the pipe 5. The cross-section of the strip is arc-shaped to facilitate better contact with the pipe 5.

[0027] The telescopic assembly includes a bolt 8, one end of which is connected to the third axis hinge 3. The fourth axis hinge 4 is slidably connected to the bolt 8. In this embodiment, a sliding sleeve 10 is provided on the axis hinge and fitted onto the bolt 8, thereby achieving a sliding engagement connection between the fourth axis hinge 4 and the bolt 8. The bolt 8 is threaded with a nut 9. The rotation of the nut 9 relative to the bolt 8 pushes the sliding sleeve 10, thereby controlling the distance between the third axis hinge 3 and the fourth axis hinge 4.

[0028] Each of the aforementioned hinges is rotatably connected to a positioning rod 11. Adjacent positioning rods 11 are connected by a rod body 12 parallel to the connecting rod 7. The rod body 12 and the positioning rod 11 are rotatably connected by hinges. Adjacent rod bodies 12 are connected to the positioning rod 11 by the same hinge. The third hinge 3 and the fourth hinge 4 are respectively connected to the middle of the positioning rod 11. In this way, one connecting rod 7, one rod body 12, and two positioning rods 11 also form a parallel four-bar linkage. This ensures that when the distance between the third hinge 3 and the fourth hinge 4 changes, the orientation of the positioning rod 11 remains unchanged. The terminal block 6 is disposed on the positioning rod 11, thereby ensuring that the orientation of the terminal block 6 remains substantially unchanged.

[0029] The terminal block 6 is a strip-shaped body, and the positioning rod 11 is connected to one end of the strip-shaped body, so that the terminal block 6 extends a certain length toward the pipe 5, thereby allowing the two strip-shaped bodies to be clamped on the outside of the pipe 5, and also enabling the pipe 5 to be double grounded.

[0030] Example 2

[0031] like Figure 2 As shown, unlike the above embodiment, the telescopic assembly includes a screw 13, that is, the bolt 8 is replaced by a screw 13. The screw 13 is rotatably connected to the fourth axis hinge 4 through a rotating connection mechanism. The third axis hinge 3 is provided with a threaded sleeve 14 that is threadedly engaged with the screw 13. The rotating connection mechanism includes a bushing 15 connected to the hinge axis of the fourth axis hinge 4. The screw 13 is rotatably engaged with the bushing 15. The screw 13 is provided with stops 16 located on both sides of the bushing 15. The stops 16 prevent the screw 13 from moving axially relative to the fourth axis hinge 4, so that the screw 13 can only rotate freely relative to the bushing 15. The end of the screw 13 is provided with a hexagonal end 18 so that the rotation of the screw 13 can be controlled by tools such as a hex wrench. By rotating the screw 13, the bushing 14 moves relative to the screw 13, thereby changing the distance between the third axis hinge 3 and the fourth axis hinge 4.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A welding ground wire dual grounding device for electrically connecting two ground wires symmetrically on a pipe to be welded, said dual grounding device comprising two terminal connectors for electrically contacting said pipe, characterized in that, The double grounding device further comprises a parallelogram mechanism, the parallelogram mechanism comprises four connecting rods and four shaft hinges, two of the connecting terminals are arranged on two opposite shaft hinges respectively, and the other two opposite shaft hinges are connected through a telescopic assembly, and the telescopic assembly controls the distance between the two shaft hinges.

2. The welding ground tie two ground device of claim 1, wherein, The telescopic assembly comprises a bolt, one end of the bolt is connected with one of the shaft hinges, and the other shaft hinge is in sliding connection with the bolt.

3. The welding ground tie two ground device of claim 2, wherein, A sliding sleeve is arranged on the shaft hinge and sleeved on the bolt.

4. The welding ground tie two ground device of claim 1, wherein, The telescopic assembly comprises a screw rod, the screw rod is in rotary connection with one of the shaft hinges through a rotary connection mechanism, and the other shaft hinge is provided with a screw sleeve in threaded connection with the screw rod.

5. The welding ground tie two ground device of claim 4, wherein, The rotary connection mechanism comprises a shaft sleeve connected with the hinge shaft of the shaft hinge, the screw rod is in rotary connection with the shaft sleeve, and the screw rod is provided with a stop body located on both sides of the shaft sleeve.

6. The welding ground tie two ground device of claim 5, wherein, A hexagonal end head is arranged at the end of the screw rod.

7. The welding ground tie two ground device of claim 1, wherein, Each of the shaft hinges is in rotary connection with a positioning rod, adjacent positioning rods are connected through a rod body parallel to the connecting rod, the rod body and the positioning rod are in rotary connection through a shaft hinge, and adjacent rod bodies are connected with the positioning rod through the same shaft hinge.

8. The welding ground tie two ground device of claim 7, wherein, The connecting terminal is arranged on the positioning rod.

9. The welding ground tie two ground device of claim 8, wherein, The connecting terminal is a strip body, and the positioning rod is connected to one end of the strip body.

10. The welding ground tie two ground device of claim 9, wherein, The cross section of the strip body is arc-shaped.

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