Projection welding nut electrode and resistance welding tool suitable for narrow space

Abstract

The utility model discloses a projection welding nut electrode suitable for narrow space and a resistance welding tool, which comprise an electrode body with a strip-shaped blocky structure, a connecting section and a welding section are respectively arranged at two ends of the electrode body in the length direction, a boss extending upwards is arranged on the upper side of the connecting section, and the welding section is arranged on the lower side of the connecting section. The welding section extends towards one side in the horizontal direction relative to the connecting section, and a welding hole used for containing a projection welding nut is formed in the lower side of the welding section. The resistance welding tool comprises an electrode holder and an electrode arm movably arranged above the electrode holder, an electrode body is mounted on the electrode arm, a mounting hole extending in the vertical direction is formed in the outer end of the electrode arm, the boss is fixedly assembled in the mounting hole, and the welding section protrudes outwards in the horizontal direction relative to the electrode arm. The electrode arm can drive the welding section to move to the position over the electrode base. The welding device has the advantages that welding in a narrow space is achieved, and the welding quality and the welding effect are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a projection welding nut electrode and a resistance welding tool suitable for narrow spaces. Background Art

[0002] Electrodes, primarily used in resistance welding equipment, are typically made of highly conductive materials. They conduct the current during the welding process, heating the welded parts, melting them, and forming a secure bond with the base material. Projection welding is a resistance welding method that relies on contact between the electrodes and the raised points, increasing the pressure and current density per unit area. This helps break the oxide film on the sheet metal surface, concentrating heat and reducing shunting, thereby improving production efficiency. Typically, projection nuts (nuts with raised points) are welded to thin sheets, allowing assembly to simply tighten the bolts.

[0003] During projection welding, if the electrode contacts other conductive points, current shunting will occur, reducing the current density per unit area of ​​the bump and easily causing a cold weld. Traditional electrodes are typically cylindrical in shape. When welding projection nuts within the confined space of a substrate, the entire electrode must be inserted into the narrow space for welding. Cylindrical electrodes are prone to contact with the substrate, causing current shunting and affecting weld quality. Furthermore, vibration caused by collision with the substrate can easily cause the projection nut to become eccentric, preventing proper bolt installation and impacting production efficiency. Utility Model Content

[0004] In view of this, the utility model provides a projection welding nut electrode suitable for narrow spaces, which aims to solve the problem that conventional electrodes are prone to contact and collision with the base material during welding in narrow spaces, resulting in cold welding and nut eccentricity.

[0005] To achieve the above purpose, the technical solution of this utility model is as follows:

[0006] A projection welding nut electrode suitable for narrow spaces includes an electrode body with a long block structure, the two ends of the electrode body in the length direction are respectively a connecting section and a welding section, an upwardly extending boss is provided on the upper side of the connecting section, the boss is used to connect the electrode arm, the welding section extends to one side in the horizontal direction relative to the connecting section, and a welding hole is provided on the lower side of the welding section for accommodating the projection welding nut.

[0007] With the above structure, the electrode body is a long block structure, the welding section extends horizontally relative to the connecting section, the connecting section is connected to the electrode arm, and only the welding section is extended into the narrow space for welding. It is small in size and not easy to come into contact with the substrate.

[0008] As a preferred embodiment, the connecting section and the welding section are integrally formed. With the above structure, the structure is compact and the electrode has good conductivity.

[0009] Preferably, a threaded hole is formed on the upper side of the boss along the axis, and the threaded hole is used to connect the electrode arm. With the above structure, the electrode body and the electrode arm can be connected by welding the boss and the electrode arm, or by threading, which is simple in structure and easy to install.

[0010] Preferably, the upper end surface of the welding section is provided with an avoidance slope, which slopes downward from the side close to the connecting section. The above structure facilitates the electrode body to be inserted into a narrow space.

[0011] Preferably, the end face of the welding section away from the connecting section in the longitudinal direction is provided with a protrusion, which is used to prevent the electrode body from colliding with the inner wall of the narrow space. With the above structure, the protrusion first contacts the inner wall of the narrow space, allowing for timely adjustment.

[0012] As a preferred embodiment, the electrode body is made of copper. With the above structure, the electrode body has good electrical conductivity, pressure resistance and corrosion resistance.

[0013] The utility model also provides a resistance welding tool, which aims to solve the problems of poor welding quality and low efficiency when welding projection welding nuts in a narrow space.

[0014] To achieve the above purpose, the technical solution of this utility model is as follows:

[0015] A resistance welding tool comprises an electrode holder and an electrode arm movably mounted above the electrode holder. A projection welding nut electrode suitable for use in narrow spaces is mounted on the electrode arm. A mounting hole extending vertically is provided at the outer end of the electrode arm, into which the boss is fixedly mounted. The welding section protrudes horizontally outward relative to the electrode arm. During welding, the electrode arm can move the welding section directly above the electrode holder. This structure prevents interference between the electrode arm and the substrate, resulting in excellent welding performance and high efficiency.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The electrode body is a long block structure, the connecting section and the welding section are arranged horizontally, and the welding section protrudes outward in the horizontal direction relative to the electrode arm. During welding, only the welding section needs to be extended into a narrow space for welding. The electrode arm and the connecting section will not interfere with the base material. The welding section is small in size and is not prone to contact or collision, resulting in shunt or nut eccentricity, and the welding effect is good.

[0018] 2. The upper side of the connecting section is a boss, and a threaded hole is opened in the boss along the axial direction. The electrode body and the electrode arm can be welded or connected by threads through the boss, which is flexible to install and has a stable structure.

[0019] 3. A protrusion is provided on the end face of the welding section away from the connecting section in the length direction. When welding in a narrow space, the protrusion first contacts the inner wall of the narrow space. At this time, the vibration is small, and the position of the electrode arm can be adjusted in time to avoid eccentricity caused by strong vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing the connection between the electrode body A and the electrode arm 4;

[0021] Figure 2 is a cross-sectional view of the electrode body A;

[0022] Figure 3 This is a diagram of the usage state of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0024] like Figure 2 As shown, a projection welding nut electrode suitable for narrow spaces includes an electrode body A. The electrode body A is in a long strip block structure and is made of metal copper with good electrical conductivity, pressure resistance and corrosion resistance. The two ends of the electrode body A in the length direction are respectively an integrally formed connecting section 1 and a welding section 2. The welding section 2 extends outward in the horizontal direction from the lower side of the connecting section 1. A welding hole 21 is provided on the lower side of the welding section 2. The welding hole 21 can adapt to the shape of the projection welding nut 7 and accommodate the projection welding nut 7. An upwardly extending circular boss 11 is provided on the upper side of the connecting section 1, and a threaded hole 11a is provided on the upper side of the boss 11 along the axis. In this embodiment, the conductive connection between the electrode body A and the electrode arm 4 can be connected by welding the circular boss 11 to the electrode arm 4, or by threading. As shown Figure 3 As shown, during welding, the inner wall of the welding hole 21 contacts the protrusion 71 on the projection welding nut 7, and the pressure and current per unit area of ​​the protrusion 71 are used to melt the protrusion 71 to achieve welding.

[0025] like Figure 2 and Figure 3 As shown, the upper end face of the welding section 2 is provided with an avoidance slope 22, and the avoidance slope 22 is inclined downward from the side close to the connecting section 1. When the electrode body A is extended into the narrow space 51, the avoidance slope 22 can reduce the interference between the electrode body A and the substrate 5, and reduce the height of the welding section 2 as much as possible, so that the electrode body A can adapt to a narrower space. In addition, a protrusion 23 is provided on the end face of the welding section 2 away from the connecting section 1 in the length direction. The protrusion 23 is long and is located in the middle of the end face. For the space of the substrate 5 with a similarly limited depth, the protrusion 23 can first touch the inner wall of the substrate 5. At this time, the jitter generated is small, and the impact on the projection welding nut 7 is also small. The position of the electrode arm 4 can be adjusted conveniently and in time to avoid affecting the welding efficiency.

[0026] like Figure 1 As shown, a resistance welding tool includes an electrode holder 3 and an electrode arm 4 movably arranged above the electrode holder 3. The outer end of the electrode arm 4 is provided with a mounting hole 41 extending in the vertical direction. The upper electrode is installed in the mounting hole 41. The lower electrode 6 is installed on the electrode holder 3, and the lower electrode 6 is provided with an elastic positioning component 61.

[0027] by Figure 1 As shown, the projection welding nut 7 is welded to the inner wall of the substrate 5 as an example. The welding space inside the substrate 5 is a narrow transverse space 51, and the narrow space 51 is not enough to accommodate the electrode arm 4 or the traditional electrode. The electrode body A suitable for the narrow space is fixedly welded in the mounting hole 41 through the boss 11. The electrode body A is the upper electrode, and the lower electrode 6 is installed on the electrode holder 3. After the connection is completed, the welding section 2 of the electrode body A can completely protrude outward in the horizontal direction relative to the electrode arm 4. During welding, the substrate 5 and the projection welding nut 7 are mounted on the elastic positioning component 61. The electrode arm 4 first drives the electrode body A to move laterally, and the welding section 2 extends into the narrow space 51. At this time, the welding hole 21 is located directly above the projection welding nut 7. Then the electrode arm 4 drives the electrode body A to fall vertically, as shown in FIG. Figure 3 As shown, the inner wall of the welding hole 21 contacts the convex point 71 of the projection welding nut 7, and current is conducted between the electrode body A, the convex point 71 and the lower electrode 6. The resistance heat generated when the current flows through the projection welding nut 7 is used to melt the convex point 71 to achieve welding.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A projection welding nut electrode suitable for narrow spaces, characterized by: The invention comprises an electrode body (A) in a long strip-shaped block structure, wherein the two ends of the electrode body (A) in the length direction are respectively a connecting section (1) and a welding section (2), the upper side of the connecting section (1) is provided with an upwardly extending boss (11), the boss (11) is used to connect the electrode arm (4), the welding section (2) extends to one side in a horizontal direction relative to the connecting section (1), and the lower side of the welding section (2) is provided with a welding hole (21) for accommodating a projection welding nut.

2. The projection welding nut electrode suitable for narrow spaces according to claim 1, characterized in that: The connecting section (1) and the welding section (2) are integrally formed.

3. The projection welding nut electrode suitable for narrow spaces according to claim 2, characterized in that: A threaded hole (11a) is provided on the upper side of the boss (11) along the axis, and the threaded hole (11a) is used to connect the electrode arm (4).

4. The projection welding nut electrode suitable for narrow spaces according to claim 1, characterized in that: The upper end surface of the welding section (2) is provided with an avoidance slope (22), and the avoidance slope (22) is inclined downward from a side close to the connecting section (1).

5. The projection welding nut electrode suitable for narrow spaces according to claim 1, characterized in that: The end surface of the welding section (2) in the length direction away from the connecting section (1) is provided with a protrusion (23), and the protrusion (23) is used to prevent the electrode body (A) from colliding with the inner wall of a narrow space.

6. The projection welding nut electrode suitable for narrow spaces according to claim 1, characterized in that: The electrode body (A) is made of metal copper.

7. A resistance welding tool, comprising an electrode holder (3) and an electrode arm (4) movably arranged above the electrode holder (3), characterized in that: The electrode arm (4) is mounted with a projection welding nut electrode suitable for narrow spaces as claimed in any one of claims 1 to 6, the outer end of the electrode arm (4) is provided with a mounting hole (41) extending in a vertical direction, the boss (11) is fixedly assembled in the mounting hole (41), and the welding section (2) protrudes outward in a horizontal direction relative to the electrode arm (4); during welding, the electrode arm (4) can drive the welding section (2) to move to directly above the electrode holder (3).

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