Welding pliers

Abstract

The welding pliers comprise an upper jaw, a lower jaw, a straight handle, a bent arm and a wire, the straight handle is located at the rear end of the lower jaw and integrally formed with the lower jaw, the bent arm is connected with the rear end of the upper jaw, the rear end of the lower jaw is hinged to the bent arm, and the wire penetrates into the straight handle and is fixed to the straight handle; the straight handle is sleeved with an insulating handle, the insulating handle extends upwards to form an extending part, a first spring positioning rod is installed on the bent arm, a second spring positioning rod is installed on the extending part, the first spring positioning rod and the second spring positioning rod are oppositely arranged, threads are arranged on the second spring positioning rod, and a nut is arranged on the second spring positioning rod in a screwed mode. A spring is installed between the first spring positioning rod and the second spring positioning rod, one end of the spring is fixed to the bent arm, and the other end of the spring is fixed to the nut. The opening and closing degree of the electrode holder is easy to control through the structure, the tension of the spring is adjustable, and the service life of the electrode holder is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding technical field especially relates to a welding tongs. BACKGROUND

[0002] Welding tongs refers to the manual arc welding, and is used to hold and operate the electrode, and guarantees the electrical connection with the electrode. The basic structure of the welding tongs is recorded in Chinese patent application No. 200920177935.1, which includes upper handle and lower cylinder handle, spring is connected between the upper handle and the lower cylinder handle, the front part of the lower cylinder handle is provided with a rectangular wire clamp, the wire clamp is surrounded by a toban-shaped metal piece, the conductive cable for electric welding is connected to the wire clamp placed in the front part inside the lower cylinder handle, the position of the wire clamp can be straightened and welded to the circular hole at the most front end, or can be bent back and welded to the circular hole opened on the toban-shaped metal piece. The structure has the following problems: the spring is too close to the tong mouth, long-term high-temperature operation can easily cause the spring to age, the clamping force decreases, and thus it cannot adapt to various electrode models, and the service life is shortened; on the other hand, the cable is only fixed by welding, which has the defect of easy to fall off. Therefore, it is necessary to improve the structure of the existing welding tongs to improve the service life. SUMMARY

[0003] The utility model aims at providing a kind of welding tongs.

[0004] The technical scheme for realizing the utility model is as follows: a welding tongs includes upper tong mouth, lower tong mouth, straight handle, bent arm and lead wire, the straight handle is located at the rear end of the lower tong mouth and is integrally formed with the lower tong mouth, the bent arm is connected with the rear end of the upper tong mouth, the rear end of the lower tong mouth is hinged with the bent arm, the lead wire is inserted into the straight handle and fixed with the straight handle, and the straight handle is sleeved with an insulating handle;The upper end of the insulating handle extends upwardly to extend, a first spring positioning rod is horizontally installed on the bent arm, a second spring positioning rod is horizontally installed on the extension, the first spring positioning rod and the second spring positioning rod are oppositely arranged, a screw thread is arranged on the second spring positioning rod, a nut is screwed on the second spring positioning rod, a spring is installed between the first spring positioning rod and the second spring positioning rod, one end of the spring is sleeved outside the first spring positioning rod and fixed on the bent arm, and the other end of the spring is sleeved outside the second spring positioning rod and fixed on the nut.

[0005] Further, a through hole with wedge-shaped cross section is horizontally formed in the straight handle, the lead wire is inserted into the through hole, a wedge is inserted into the through hole to prevent the lead wire from coming out of the through hole, and the wedge is tightly matched with the through hole. The structure ensures that the lead wire always abuts against the straight handle and is not easy to come out of the straight handle, thereby increasing the reliability of the welding tongs.

[0006] Further, the length of the wedge is longer than the length of the through hole, facilitating wiring.

[0007] The utility model innovates the installation position and installation structure of spring, one end of spring is fixed on nut, on one hand, it is easy to control the opening and closing degree of welding tongs, on the other hand, make the tension of spring adjustable, increase the versatility of welding tongs, and spring is far from the mouth, will not lose elasticity because of long time high temperature, improve the service life of welding tongs. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the structure schematic view of the welding tongs of the utility model embodiment;

[0009] Figure 2 It is the sectional structure schematic view of the lower mouth, the straight handle and the wedge of the utility model embodiment. DETAILED DESCRIPTION

[0010] The preferred embodiment of the utility model is described in detail below in combination with the drawings.

[0011] As Figure 1 And Figure 2 As shown in the figure, a kind of welding tongs, including upper mouth 1, lower mouth 2, straight handle 3, bent arm 4 and wire 5, the straight handle 3 is located in the rear end of the lower mouth 2 and is integrally formed with the lower mouth 2, the bent arm 4 is connected with the rear end of the upper mouth 2, the rear end of the lower mouth 2 is hinged with the bent arm 4, the wire 5 is inserted into the straight handle 3 and is fixed with the straight handle 3, the straight handle 3 is equipped with insulating handle 6.

[0012] The upper end of the insulating handle 6 extends out extension 61, the first spring positioning rod 7 is horizontally installed on the bent arm 4, the second spring positioning rod 8 is horizontally installed on the extension 6, the first spring positioning rod 7 is oppositely arranged with the second spring positioning rod 8, the second spring positioning rod 8 is provided with screw thread (not shown), a nut 9 is rotated and arranged on the second spring positioning rod 8, the first spring positioning rod 7 and the second spring positioning rod 8 are installed with spring 10, one end 101 of the spring 10 is sleeved on the first spring positioning rod 7 and is fixed on the bent arm 4, the other end 102 of the spring 10 is sleeved on the second spring positioning rod 8 and is fixed on the nut 9.

[0013] Further, the straight handle 3 is provided with a through hole 31 with a wedge-shaped cross section, the wire 5 is inserted into the through hole 31, a wedge 11 is inserted into the through hole 31 to prevent the wire 5 from being pulled out of the through hole, the wedge 11 is tightly matched with the through hole 31, and the length A of the wedge 11 is longer than the length B of the through hole 31. In use, the welding tongs are connected with the power supply through the wire to transmit the welding current, and the opening and closing angle of the upper jaw and the lower jaw can be controlled by pressing the spring downward, so that the welding rod is clamped for welding operation. If the spring is aged and the elasticity is poor, the tension of the spring can be adjusted by rotating the nut, and the service life of the welding tongs is prolonged.

[0014] The utility model discloses the wire can with straight handle welding fixed, but the embodiment welding line and the straight handle of conductive material production adopt wedge-shaped clamping, and the welding line is pulled more and more tight, and the insulating handle can be pressed against the anti -loose, guarantees the wire always with straight handle and is in contact, and it is not easy to pull out of the straight handle, has increased the reliability of the welding tongs also increased the life of the welding tongs, the length of the wedge is not limited, when the length of the wedge is longer than the length of the through hole, more beneficial to wiring.

[0015] The above-mentioned is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent process transformation using the utility model specification content or direct or indirect application in other related technical fields is also included in the patent protection range of the utility model.

Claims

1. A welding tongs, comprising an upper jaw, a lower jaw, a straight handle, a bent arm and a wire, the straight handle is located at the rear end of the lower jaw and is integrally formed with the lower jaw, the bent arm is connected with the rear end of the upper jaw, the rear end of the lower jaw is hinged with the bent arm, the wire is inserted into the straight handle and is fixed with the straight handle, and an insulating handle is sleeved outside the straight handle; characterized in that: The upper end of the insulating handle extends upwardly with an extension, a first spring positioning rod is horizontally mounted on the bent arm, a second spring positioning rod is horizontally mounted on the extension, the first spring positioning rod is oppositely arranged with the second spring positioning rod, a screw thread is arranged on the second spring positioning rod, a nut is screwed on the second spring positioning rod, a spring is mounted between the first spring positioning rod and the second spring positioning rod, one end of the spring is sleeved outside the first spring positioning rod and fixed on the bent arm, and the other end of the spring is sleeved outside the second spring positioning rod and fixed on the nut.

2. The welding torch of claim 1, wherein: The straight handle is internally provided with a through hole with a wedge-shaped cross section, the wire is inserted into the through hole, and a wedge is inserted into the through hole to prevent the wire from being pulled out of the through hole.

3. The welding torch of claim 2, wherein: The length of the wedge is longer than the length of the through hole.

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