Spot welding machine for welding stationary contacts

Abstract

The present invention relates to a spot welding machine for welding a stationary contact. The present invention comprises an upper electrode, a lower electrode, and a clamping device for the upper and lower electrodes which is a square block formed by an L-shaped block and a rectangular clamping block. The upper electrode clamping device connects the lower end of the cylindrical body of the upper electrode together, and also clamps and fixes a carbon electrode which is a cylindrical body at the upper end and a rectangular parallelepiped at the lower end; a rectangular copper bar for fixing a processed stationary contact; the lower part of the copper bar has a base for carrying and placing the processed stationary contact, and a fixing frame for a cam handle for clamping the processed stationary contact; the copper bar is connected to the lower electrode clamping device; in addition, there is an electrode penetrating two rectangular planes of the copper bar in the middle part of the copper bar. Due to the adoption of the technical solution of the present invention, the welding speed is fast, the copper material will not be annealed during welding, the clamping is convenient, the product quality is guaranteed, the production efficiency is improved, and the production needs are met.

Description

Technical Field

[0001] The invention belongs to welding equipment, in particular to a spot welding machine for welding static contacts. Background Art

[0002] For the spot welding machine (753-03), model: QN-16, in order to weld a relatively long static contact, the welding process used is to place the static contact perpendicular to the upper and lower electrodes, and to place the end to be welded with the silver point on the copper body of the static contact near the heated silver point. After the copper is heated, the heat is transferred to the surface of the silver point, so that the silver point and the static contact are welded firmly. The electrical conduction method is: upper electrode carbon rod → static contact (workpiece) → lower electrode carbon rod.

[0003] This welding process can weld the silver points firmly, but it has the following disadvantages:

[0004] 1. It takes a lot of heat to weld the silver point firmly. The heat of the silver point comes from the heat of copper, so the copper must be heated extremely high to weld the silver point firmly. Due to the overheating of copper, the copper material is partially annealed during the welding process, which changes the material properties and softens the local material, affecting the customer's use effect.

[0005] 2. Before welding, the clamping process is complicated and difficult to operate, which affects production efficiency.

[0006] 3. The silver spot is heated slowly during welding, which results in a long welding time and low welding efficiency, which cannot meet the increasing production needs. Summary of the invention

[0007] The invention aims to solve the technical problems existing in the known technology and provides a spot welding machine for welding static contacts, which has the advantages of fast heating speed of silver spots, short welding time and high welding efficiency.

[0008] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is as follows: it includes an upper electrode, a lower electrode, and a clamping device for the upper and lower electrodes which is a square block composed of an L-shaped block and a rectangular clamping block, wherein the upper electrode clamping device fixes the lower end of the cylindrical body of the upper electrode together, and also clamps and fixes a rectangular carbon pole which is used to contact the silver point of the processed static contact and has a cylinder with an upper end having the same diameter as the upper electrode and the lower end of the cylinder fixed together; a rectangular copper bar which is used to fix the processed static contact and is larger than the length of the processed static contact; the copper bar The lower part of the copper bar has a base for supporting the end face opposite to one end of the silver point on the processed static contact; and the copper bar also has a pair of fixing frames with cam handles for clamping the processed static contact; the copper bar is fixedly connected with the rectangular clamping block and L-shaped block in the lower electrode clamping device; in addition, there is an electrode penetrating the two largest rectangular planes of the copper bar in the middle of the contact part of the copper bar with the rectangular clamping block of the lower electrode clamping device, and the electrode is fixedly connected with the copper bar in a tight fit, and the other end is in close contact with the upper electrode.

[0009] The present invention can also adopt the following technical solutions:

[0010] An electrode is provided in the middle of the portion of the copper bar that contacts the rectangular clamping block of the lower electrode clamping device and passes through the two largest rectangular planes of the copper bar. The electrode is a carbon electrode or a molybdenum electrode.

[0011] The advantages and positive effects of the present invention are as follows: due to the adoption of the technical solution of the present invention, the heat required by the silver point is directly provided by the upper electrode, and the heat is transferred from the upper electrode→silver point→copper material→lower electrode. The silver point is directly heated, the welding speed is fast, and annealing of the copper material will not be caused during welding. In addition, clamping is convenient, the quality of the product is guaranteed, the production efficiency is improved, and the production needs are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle copper busbar;

[0014] Figure 3 It is a schematic diagram of electrical conduction of the present invention. DETAILED DESCRIPTION

[0015] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0016] like Figure 1 , 2 As shown, the upper electrode power transmission conduit 1 inputs current to the upper electrode 14, and the L-shaped block clamping block 2 and the rectangular clamping block 3 of the upper electrode clamping device clamp the upper electrode 14 and a rectangular carbon electrode 4 with a cylinder with the same diameter as the upper electrode 14 and a cylinder fixedly connected to the lower end of the cylinder for contacting the silver point 9 of the processed static contact 12. The lower electrode power transmission conduit 7 and the lower electrode 15 are electrically connected to each other. The L-shaped block clamping block 6 and the rectangular clamping block 5 of the lower electrode clamping device, as well as the copper bar 8 and a pair of fixing frames 10 on both sides with cam handles 11 are fixed to each other with their through-hole bolts. There is a base 13 for carrying the processed static contact 12 at the lower part of the copper bar 8. The lower end of the processed static contact 12 is placed on the base 13, and the upper end is inserted into the fixing frames 10 on both sides and clamped on the copper bar 8 with the cam handle 11. The silver point 9 to be welded is placed on the top of the processed static contact 12. A carbon electrode 16 is provided at the place where the L-shaped block clamping block 6 and the rectangular parallelepiped clamping block 5 of the copper bar 8 and the lower electrode 15 clamping device are in contact.

[0017] The carbon electrode 16 may also be a molybdenum electrode.

[0018] The operation process of the present invention is as follows: the static contact 12 is placed vertically on the upper surface of the base 13, and the static contact 12 is placed in the space between the pair of L-shaped blocks of the fixing frame 10, and the cam handle 11 is turned downward to make the cam handle 11 press the static contact 12. At this time, one side of the static contact 12 is close to the copper bar 8, the silver point 9 is placed on the upper surface of the static contact 12, and then the foot pedal of the spot welding machine is stepped on to make the upper electrode 14 press the silver point 9, and then power is supplied for welding. After the silver point is welded, the foot pedal of the spot welding machine is released, the cam handle 11 is turned upward and the static contact 12 is taken out.

[0019] Working principle of welding: The improved electrical conduction method is: upper electrode power transmission conduit 1 → upper electrode 14 and carbon electrode 4 → silver point 9 → static contact 12 (workpiece) → copper bar 8 and carbon electrode 16 on copper bar 8 → lower electrode 15 → lower electrode power transmission conduit 7, so that the heat will melt the silver point 9 and the static contact 12 together (there is a 0.2mm thick welding sheet and flux between the static contact 12 and the silver point 9).

Claims

1. A spot welding machine for welding a stationary contact, comprising an upper electrode, a lower electrode, and a clamping device for the upper and lower electrodes which is a square block formed by an L-shaped block and a rectangular clamping block, characterized in that: The upper electrode clamping device fixes the lower end of the cylindrical body of the upper electrode together, and also fixes a rectangular carbon electrode for contacting the silver point of the processed static contact, which has a cylindrical body with an upper end having the same diameter as the upper electrode and the lower end of the cylindrical body fixed together; a rectangular copper bar for fixing the processed static contact and being longer than the processed static contact; the lower part of the copper bar has a bottom for supporting the end surface opposite to the silver point on the processed static contact The copper bar also has a pair of fixing frames with cam handles for clamping the processed static contact; the copper bar is fixedly connected with the rectangular clamping block and the L-shaped block in the lower electrode clamping device; in addition, there is an electrode penetrating the two largest rectangular planes of the copper bar in the middle of the contact part of the copper bar with the rectangular clamping block of the lower electrode clamping device, the electrode is fixedly connected with the copper bar in a tight fit, and the other end is in close contact with the upper electrode.

2. The spot welding machine for welding static contacts according to claim 1 is characterized in that: An electrode is provided in the middle of the portion of the copper bar that contacts the rectangular clamping block of the lower electrode clamping device and passes through the two largest rectangular planes of the copper bar. The electrode is a carbon electrode or a molybdenum electrode.

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