WO2018192225A1 - Hand-pressure elastic ground wire for welding - Google Patents

Abstract

Disclosed is a hand-pressure elastic ground wire for welding, comprising a welding unit (1) and a ground unit (2), wherein the welding unit (1) comprises a welding part and a pressing part, the ground unit (2) comprises a flow guide face (221), the welding unit (1) and the ground unit (2) are assembled together and can move relative to each other, an elastic element is connected between the welding unit (1) and the ground unit (2), the welding unit (1), by virtue of exerting a force on the pressing part, prevents the elastic force of the elastic element, making the welding part protrude out of the flow guide face (221) and weld and connect to sheet metal, and by virtue of the elastic force of the elastic element, the ground unit makes the flow guide face (221) contact and press the sheet metal. The hand-pressure elastic ground wire for welding solves the existing problems of stud-type ground wires having high energy consumption, having high operating demands, and easily coming loose, and has the advantages of being convenient to operate, welding spots not easily coming loose, and energy consumption being low.

Description

 Welding elastic ground wire by hand

Technical field

The present invention relates to the field of welding, and in particular to a grounding wire for use with a spot welding gun.

Background technique

In the current automotive sheet metal repair, a spot welder is required. The spot welder includes a power box, a welding gun, and a grounding wire connected to the sheet metal for forming a circuit with the torch.

There are several types of grounding wires used in traditional automotive sheet metal repair spot welders:

1, Clip type, including a metal clip, the metal clip is clamped on the edge of the sheet metal, and the back end of the metal clip is connected to the ground wire. The advantage is that it is used for one clip, the operation requirement is low, and the welding head is not required to be polished, and the shortage is only installed on the edge. The sheet metal repairing position is far away from the grippable edge, which has a great influence on the welding current; it is generally used when the aluminum body is repaired by the sheet metal, and is used less on the market.

2, Stud type, including an iron screw and a brass hand-tightening grounding nut, the grounding nut is placed under the iron screw, and the upper part of the iron screw is also locked up and down by two brass terminal nuts. The terminal maintains the good connection and conduction between the iron screw and the output cable. The front end of the iron screw is tapered. The tapered cone is used to improve the contact resistance and facilitate the electric resistance welding. After the welding is completed, the tip of the tip is fixed at the top. On the gold, the user needs to screw the grounding nut to lower the nut position until it is in full contact with the body sheet metal to ensure good electrical conductivity. The stud grounding wire is used in the mainstream of the European and American repair market. The advantage is that it can be fixed at any point on the sheet metal to reduce the loss of current on the sheet metal. However, the grounding wire of the structure has the following disadvantages: Since the grounding nut and the terminal nut are separated by a section of the iron screw, the cable to the body base material still needs to pass the section of the iron screw as the conductive transmission medium, so there is a lot of energy loss, in order to reduce the loss, in addition to increasing the stud Outside the area, the distance between the cable terminal and the tip of the tip must be shortened so that the length of the exposed iron screw after the grounding nut is locked is as short as possible; the second is that the stud grounding wire needs to be polished after repeated use. Third, the design of the stud grounding wire also has many requirements for the operator's operation. When the grounding nut is rotated to the last few times, it is inevitable that the frictional force is applied to the iron screw. If the torque is too large, the tip is easily twisted. The welding point of the tip of the cone, and the twisting is too small and the locking is not tight; the fourth is that after the grounding wire is installed, the output current is very large (more than one thousand amps) due to the spot welding machine operation. After the mass screw is subjected to a large current through several times, due to its high impedance, it also generates heat. After the heat deformation, the associated tightening of the grounding nut is affected. Once the grounding nut is not tight, it is in contact with the base metal. Even worse, causing the tip solder joint to withstand enough current to heat up and eventually loosen.

3, The magnetic type includes a magnet for adsorbing on the sheet metal of the automobile, and the magnet is provided with a grounding wire. The advantage of the structure is that it is used for one suction, the operation requirement is low, and the welding head is not required to be polished, and can be fixed at any point. It will adsorb iron powder iron powder, the more dirty it is and the harder it is to clean, it is rarely used in the market.

4, Hanging type, including meson piece, clamp and fastening piece, the meson piece is welded on the sheet metal, the fixture is fixedly connected to the meson piece, the fastening piece is set on the fixture and the grounding cable is connected, and the hanging type grounding wire is mainly Adopted in Japan, Taiwan and Southeast Asia, the advantage is that it can be fixed at any point. The disadvantage is that the operation requirements are high, and the conductive performance has a great relationship with the user's operation.

The above grounding wire structure has its own advantages and disadvantages, and the stud grounding wire and the hanging chip grounding wire are the two grounding wire structures which are widely used nowadays. The Applicant proposes improvements based on the stud grounding wire, retaining its advantages, overcoming its main drawbacks, and thus obtaining the technical solution of the present invention.

Summary of the invention

The invention aims to solve the problem that the existing stud grounding wire has large energy loss, high operation requirement and easy looseness, and proposes a new structure grounding wire used together with the spot welding gun, which can effectively reduce the grounding wire Energy loss, low operating requirements, and easy to loosen after installation.

The technical solution adopted by the present invention to solve the technical problem thereof is:

Welding the elastic grounding wire by hand, including the welding unit and the grounding unit.

The welding unit includes a welded portion for soldering connection with a sheet metal, and an insulating pressing portion for pressing,

The grounding unit includes a flow guiding surface in contact with the sheet metal,

The welding unit and the grounding unit are assembled and relatively movable, and an elastic element is disposed between the welding unit and the grounding unit.

The welding unit overcomes the elastic force of the elastic element by the force applied to the pressing portion, so that the welded portion protrudes outside the flow guiding surface and is welded to the sheet metal.

The grounding unit contacts and compresses the flow guiding surface on the sheet metal by the elastic force of the elastic member.

Specifically, the elastic component is a spring sleeved on the welding portion, and the lower end of the spring is in contact with the grounding unit, and the upper end of the spring is in contact with the welding unit.

As a further improvement of the above technical solution, the grounding unit comprises a metal screw, a grounding nut and a wiring nut, the grounding nut and the connecting nut are screwed on the metal screw, and the wiring nut is located above the grounding nut, between the grounding nut and the wiring nut The terminal block is locked, and the flow guiding surface is disposed at the bottom of the ground nut. The flow guiding surface at the bottom of the grounding nut is in contact with the sheet metal. When the terminal is in contact with the top of the grounding nut, only the grounding nut is required between the sheet metal and the terminal. The grounding nut can be made of metal with low resistivity to effectively reduce energy loss.

As a further improvement of the above technical solution, a through hole penetrating vertically is disposed in a middle portion of the metal screw, and the metal screw is sleeved in the middle of the welded portion through the through hole, and the upper and lower ends of the welded portion pass through the metal screw, and the upper end of the welded portion is connected and pressed. At the lower end of the welded portion, a tapered tapered welding head is provided. The metal screw is sleeved in the middle of the welding part, and the welding part can be connected to the grounded cable by means of the wiring unit for arc welding; the welding head is set as a tapered cone to improve the contact resistance, which is helpful for electric resistance welding and makes the welding part easier to connect. On the sheet metal.

As a further improvement of the above technical solution, the upper part of the metal screw is connected with an insulated movable seat, and the welded part passes through the movable seat. The movable seat cooperates with the pressing portion, and the operator does not need to contact the conductive portion, and the safety is higher.

As a further improvement of the above technical solution, the movable seat is provided with a first convex ring that cooperates with the pressing portion. When the operator performs one-hand operation, the thumb or the palm is in contact with the pressing portion, and the other fingers are caught on the first convex ring of the movable seat, so as to facilitate pressing and pressing.

As a further improvement of the above technical solution, a limited position circlip is disposed on the welded portion in the movable seat, an upper end surface of the metal screw is located in the movable seat, and the spring is disposed in the movable seat, and the two ends of the spring respectively abut The upper end of the limit circlip and the metal screw. The spring is arranged in the movable seat to maintain the appearance. At the same time, the setting of the limit retaining spring can form the upper abutment point of the spring, and can also cooperate with the movable seat, and the limit retaining spring can only move in the movable seat, limiting the welding part. The range of movement.

As a further improvement of the above technical solution, the metal screw upper portion is provided with a second convex ring that cooperates with the pressing portion, and the spring is disposed between the pressing portion and the second convex ring.

As a further improvement of the above technical solution, the metal screw is provided with a limiting slot on the side of the upper and lower sides, and the corresponding limiting slot is disposed with a mounting hole in the middle of the soldering portion, and the limiting hole is mounted on the mounting hole, and the limiting position is The pin passes through the limit slot. The limit pin moves along with the welding portion, and the limit groove limits the moving range of the limit pin, thereby controlling the moving range of the welded portion.

As a further improvement of the above technical solution, the welded portion is made of iron, and the welded portion is plated with a rustproof layer. The iron welded portion is more easily welded to the iron automobile sheet metal, and the rustproof layer is preferably a copper layer.

Preferably, the ground nut is preferably made of a copper material having a low electrical resistivity to reduce current loss.

The invention has the beneficial effects that the welding hand-pressed elastic grounding wire proposed by the invention has the following advantages compared with the existing stud grounding wire:

1, The utility model has the advantages of convenient operation and low operation requirement, and an elastic component is arranged between the welding unit and the grounding unit. When welding, the operator applies a force to the pressing portion to overcome the elastic force of the elastic component, so that the welding portion protrudes outside the flow guiding surface and is welded with the sheet metal. After fixing, after welding, the operator releases the hand, and the grounding unit contacts the flow guiding surface under the elastic force of the elastic member and presses it on the sheet metal;

2, The solder joint is not easy to loosen. Because the design relies on the elastic force of the elastic component to make the flow guiding surface of the grounding unit contact and press on the sheet metal, there is no additional torque, so that the solder joint is not easily twisted off;

3, The energy loss is small. The sheet metal of the design and the terminal are electrically connected without the iron screw, but the grounding nut made of the low resistivity material is used for conducting electricity, thereby improving the conductivity, reducing the loss, and reducing the heat.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of one embodiment of the present invention.

2 is an exploded view of the hand-pressed elastic ground wire of FIG. 1.

3 is a cross-sectional view of the hand-pressed elastic ground line of FIG. 1.

Figure 4 is a schematic view showing the structure of another embodiment of the present invention.

Figure 5 is an exploded view of the hand-pressed elastic ground wire of Figure 4.

detailed description

The welding manual pressure elastic grounding wire of the invention comprises a welding unit, a grounding unit and an elastic component, the welding unit is used for welding and fixing with a sheet metal, the welding unit comprises a welding part and a pressing part, and the grounding unit is used for connecting the terminal to the sheet metal. The circuit, the wiring unit includes a flow guiding surface. The welding unit and the grounding unit are assembled and movable relative to each other, and the elastic element is disposed between the welding unit and the grounding unit, and the welding unit needs to overcome the elastic force of the elastic element by the force applied by the operator at the pressing portion to cause the welding portion to protrude. The flow surface is welded to the sheet metal, and the grounding unit contacts the flow guiding surface and presses it on the sheet metal by the elastic force of the elastic member.

Referring to Figures 1 through 5, Figures 1 through 3 disclose a preferred embodiment of the present invention, and Figures 4 and 5 disclose another embodiment of the present invention for illustrating the hand-pressure elasticity of the present invention. Ground wire.

The hand pressure elastic grounding wire includes an insulating nut 12 serving as a pressing portion, and a metal rod 11 serving as a welding portion, and the metal rod 11 is preferably an iron rod coated with a rustproof copper layer on the surface, the metal rod The upper end of the 11 is provided with a threaded connector 111, the insulating nut 12 is connected to the threaded joint 111, and the lower end of the metal rod 11 is provided with a tapered solder joint 113, and the insulating nut 12 and the metal rod 11 constitute the welding unit 1. . Preferably, the top of the insulating nut 12 is a smooth surface. The metal rod 11 can also be selected from other metals which are easily fixed by welding with iron and aluminum. The surface of the metal rod 11 can be provided with other anti-rust layers or no anti-rust layer.

The hand pressure elastic ground wire further includes a grounding unit 2, the grounding unit 2 includes a metal screw 21, a grounding nut 22 and a wiring nut 23, and the grounding nut 22 and the terminal nut 23 are screwed on the metal screw 21, The bottom of the grounding nut 22 is disposed as a flat flow guiding surface 221, the wiring nut 23 is located above the grounding nut 22, and the terminal is locked between the grounding nut 22 and the terminal nut 23. The grounding nut 22 and the terminal nut 23 can be directly in contact with the terminal, as in the first embodiment. Referring to FIG. 5, in the second embodiment, the grounding unit 2 can further include a grounding nut 22 and a wiring nut. 23 between the washer 24 and the spring meson.

A through hole penetrating vertically is disposed in a middle portion of the metal screw 21, and the metal screw 21 is sleeved in the middle of the metal rod 11 through the through hole, and the metal screw 11 is passed through the upper and lower ends of the metal rod 11. The metal rod 11 is sleeved with a spring 3, and the lower end of the spring 3 is in contact with the grounding unit 2, and the upper end of the spring is in contact with the welding unit 1, and the spring 3 is an elastic member that applies an elastic force between the welding unit 1 and the grounding unit 2.

Preferably, referring to FIG. 1 to FIG. 3, in the embodiment, the grounding unit 2 further includes a movable seat 25 connected to the upper end of the metal screw 21, and the metal rod 11 passes through the movable seat 25. The movable seat 25 is provided with a first convex ring 251. The first convex ring 251 cooperates with the insulating nut 12 of the pressing portion, which facilitates the pressing action of the operator, and the insulation performance of the movable seat 25 and the insulating nut 12 ensures operation. The safety of the person. A limit retaining spring 114 is disposed on the rod of the metal rod 11 in the movable seat 25, the upper end surface of the metal screw 21 is located in the movable seat 25, and the spring 3 is disposed in the movable seat 25, and the two ends of the spring 3 are respectively respectively abutted The upper end surface of the limit retaining spring 114 and the metal screw 21 is connected, and the above structure conceals the spring 3 to make the appearance of the product more compact.

Referring to FIG. 4 and FIG. 5, in the second embodiment, the spring 3 is disposed between the metal screw 21 and the insulating nut 12, and the upper portion of the metal screw 21 is provided with a second protruding ring 211 extending horizontally, and two of the springs 3 The ends are respectively disposed on the insulating nut 12 and the second convex ring 211. Further, the metal screw 21 is provided with a limiting slot 212 in the up-and-down direction. The metal rod 11 is provided with a mounting hole corresponding to the limiting slot 212. The limiting hole 112 is mounted on the mounting hole, and the limiting pin is mounted. 112 passes through the limiting slot 212.

Referring to FIGS. 1 and 4, after the assembly of the hand-pressed elastic grounding wire of the present invention is completed, the welding unit 1 is lifted by the elastic force of the spring 3, and the tapered tapered welding head 113 of the metal bar 11 is hidden in the grounding nut 22. Before use, the grounding nut 22 is screwed to adjust the vertical distance between the flow guiding surface 221 at the bottom of the grounding nut 22 and the tip end of the tapered welding head 113, so that after the welding unit 1 is welded and fixed, the grounding unit 2 and the automobile sheet metal are controlled. The pressure between the two is required to be connected between the grounding nut 22 and the terminal nut 23 before use, and the terminal nut 23 is screwed to lock. When in use, the operator presses the insulating nut 12 by hand to overcome the elastic force of the spring 3, so that the tapered welding head 113 of the metal rod 11 protrudes outside the flow guiding surface 221, and contacts the automobile sheet metal, and the operator simultaneously puts the spot welding gun After a short contact on the sheet metal, the metal rod 11 is welded and fixed to the sheet metal by a short large current; the operator releases the hand pressing the insulating nut 12, and the metal rod 11 is fixed at the metal rod 11 On the sheet metal, the grounding unit 2 approaches the sheet metal under the elastic force of the spring 3, and the flow guiding surface 221 is closely attached to the sheet metal to maintain good contact with the sheet metal to complete the installation of the grounding wire.

After the grounding wire is installed, the grounding nut 22 only needs to pass between the terminal of the automobile sheet metal and the grounding wire. Therefore, the grounding nut 22 is made of metal such as silver or copper with low resistivity, which can effectively reduce energy loss. In addition, the cross-sectional area of the grounding nut 22 is increased to reduce the height thereof, and the current loss can also be reduced, and the operation only needs to change one of the accessories of the grounding nut 22, which is easy to implement.

The welding hand-pressing elastic grounding wire proposed by the invention has the following advantages: 1) convenient operation and low operation requirement, and an elastic component is arranged between the welding unit and the grounding unit, and when the welding is performed, the operator's hand applies a force to the pressing portion. Overcoming the elastic force of the elastic member, the welded portion protrudes outside the flow guiding surface and is fixed by the sheet metal welding. After welding, the operator releases the hand, and the grounding unit contacts the guiding surface under the elastic force of the elastic member and presses it on the sheet metal. 2), the solder joint is not easy to loose, because the design relies on the elastic force of the elastic element to make the grounding surface of the grounding unit contact and press on the sheet metal, there is no additional torque, so that the solder joint is not easy to twist; 3), energy The loss is small, and the sheet metal of the design and the terminal are electrically connected without the iron screw, but the grounding nut made of the low resistivity material is used for conducting electricity, thereby improving the conductivity, reducing the loss, and reducing the heat generation.

The above specific structure and size data are specifically described in the preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and those skilled in the art can make it without departing from the spirit of the present invention. Various equivalent modifications or substitutions are intended to be included within the scope of the invention as defined by the appended claims.

Claims (10)

 Welding elastic grounding wire by hand, characterized in that it comprises a welding unit and a grounding unit, The welding unit includes a welded portion for soldering connection with a sheet metal, and an insulating pressing portion for pressing, The grounding unit includes a flow guiding surface in contact with the sheet metal, The welding unit and the grounding unit are assembled and relatively movable, and an elastic element is disposed between the welding unit and the grounding unit. The welding unit overcomes the elastic force of the elastic element by the force applied to the pressing portion, so that the welded portion protrudes outside the flow guiding surface and is welded to the sheet metal. The grounding unit contacts and compresses the flow guiding surface on the sheet metal by the elastic force of the elastic member. The welding manual pressure elastic grounding wire according to claim 1, wherein the elastic member is a spring sleeved on the welding portion, the lower end of the spring is in contact with the grounding unit, and the upper end of the spring is in contact with the welding unit. . The welding manual elastic grounding wire according to claim 2, wherein the grounding unit comprises a metal screw, a grounding nut and a wiring nut, the grounding nut and the wiring nut are screwed on the metal screw, and the wiring nut is located Above the grounding nut, a terminal is locked between the grounding nut and the terminal nut, and the guiding surface is disposed at the bottom of the grounding nut. The welding manual pressure elastic grounding wire according to claim 3, wherein the metal screw is provided with a through hole penetrating vertically in the middle thereof, and the metal screw is sleeved in the middle of the welding portion through the through hole, and the upper and lower ends of the welded portion are worn. A metal screw is connected, and the upper end of the welded portion is connected to the pressing portion, and the lower end of the welded portion is provided with a tapered tapered welding head. The welding-type elastic grounding wire according to claim 4, wherein the upper portion of the metal screw is connected with an insulated movable seat, and the welded portion passes through the movable seat. The welding manual pressure elastic grounding wire according to claim 5, wherein the movable seat is provided with a first convex ring that cooperates with the pressing portion. The welding manual pressure elastic grounding wire according to claim 5, wherein a fixed position retaining spring is disposed on the welded portion in the movable seat, and an upper end surface of the metal screw is located in the movable seat, and the spring is disposed. In the movable seat, the two ends of the spring abut against the limit circlip and the upper end surface of the metal screw. The welding-type elastic grounding wire according to claim 4, wherein the metal screw upper portion is provided with a second convex ring that cooperates with the pressing portion, and the spring is disposed between the pressing portion and the second convex ring. . The welding hand-pressing elastic grounding wire according to claim 8, wherein the metal screw has a limiting groove on the side of the metal screw, and the fixing groove is provided with a mounting hole in the middle of the welding portion, the mounting A limit pin is mounted on the hole, and the limit pin passes through the limit groove. The welding-type elastic grounding wire according to any one of claims 1 to 9, wherein the welded portion is made of iron, and the welded portion is plated with a rustproof layer.