Intermediate-frequency spot welding positioning mechanism for moving contact of circuit breaker
Through the intermediate frequency spot welding positioning mechanism, the cooperation of the intermediate frequency servo spot welding machine and positioning fixture is used to achieve efficient, stable and reliable welding of the moving contacts of small circuit breakers, solving the problem of inefficient welding quality of copper braided wires and moving contacts and moving contacts in the prior art.
Patent Information
- Application Number
- CN202421939671.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-10
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-10
AI Technical Summary
During the production and manufacturing process of existing small circuit breakers, the spot welding quality of copper braided wires, movable contacts and movable contact frames is low and the efficiency is low. The welding energy fluctuates greatly and it is easy to damage the welded parts.
The intermediate frequency spot welding positioning mechanism of the moving contacts of the circuit breaker includes an intermediate frequency servo spot welding machine, positioning fixture and positioning groove. The welding energy and pressure are accurately controlled through the intermediate frequency inverter technology and pressure sensors, so as to achieve accurate positioning and one-time welding of the dynamic contacts and copper braided wires.
The spot welding pass rate and efficiency are improved, and the stability and accuracy of welding quality are ensured, the structure is simple and reliable, the welding position is accurate, and the welding quality is at the best state.
Smart Images
Figure CN223129717U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to an intermediate frequency spot welding positioning mechanism for a moving contact of a circuit breaker. Background Art
[0002] A miniature circuit breaker, also known as a small circuit breaker, is applicable to the overload and short-circuit protection of circuits with an alternating current of 50 / 60 Hz, a rated voltage of 230 / 400 V, and a rated current not exceeding 125 A. It can also be used for the infrequent operation and conversion of circuits under normal conditions. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise buildings, and civil residences. A miniature circuit breaker includes a housing, an operating mechanism, a moving contact carrier linked and cooperated with the operating mechanism, a moving contact arranged on the moving contact carrier, a static contact, an incoming line terminal, a copper braid connected between the incoming line terminal and the moving contact, an arc extinguishing system, and an outgoing line terminal. During the production and manufacturing process of the existing miniature circuit breaker, it is necessary to spot-weld and connect the copper braid to the moving contact and the moving contact carrier. The existing copper braid is welded to the moving contact and the moving contact carrier by an ordinary spot welder. Since the ordinary spot welder uses the resistance welding method, the welding energy fluctuates greatly, and the pressure applied by the upper and lower electrodes is relatively large (0.5 - 1.2 Ma), resulting in local high temperature and pressure, which easily damages the welded parts, and the qualified rate of spot welding quality is relatively low. During welding, it is necessary to spot-weld the copper braid to the moving contact and the moving contact carrier twice successively to achieve the spot welding of the moving contact of the miniature circuit breaker, and the spot welding efficiency is relatively low. Summary of the Invention
[0003] The purpose of the utility model is to overcome the defects of the prior art and provide an intermediate frequency spot welding positioning mechanism for a moving contact of a circuit breaker, which has a simple structure, stable and reliable performance, high qualified rate of spot welding, and high spot welding efficiency.
[0004] To achieve the above purpose, the utility model adopts an intermediate frequency spot welding positioning mechanism for a moving contact of a circuit breaker, which includes an intermediate frequency servo spot welder, and a positioning fixture for placing a moving contact carrier at the position between the upper electrode and the lower electrode corresponding to the intermediate frequency servo spot welder. The positioning fixture is arranged on the lower electrode. A positioning groove matched with the moving contact carrier is arranged on the side of the positioning fixture facing the upper electrode. A positioning convex block matched with the positioning groove is arranged on the moving contact carrier. The positioning convex block is clamped in the positioning groove, and the clamping cooperation between the moving contact carrier and the positioning fixture is formed. A spot welding groove for placing a moving contact and a copper braid is arranged at the position directly below the upper electrode of the intermediate frequency servo spot welder on the moving contact carrier.
[0005] The beneficial effects of the above structure are as follows: The positioning fixture can accurately position the moving contact holder, moving contact, and copper braided wire at the spot welding position. The moving contact and copper braided wire are placed in the spot welding groove of the moving contact holder. The upper electrode of the medium-frequency servo spot welder can spot-weld the copper braided wire and moving contact onto the moving contact holder at one time, with high spot welding efficiency. Moreover, the medium-frequency servo spot welder adopts medium-frequency inversion technology. By adjusting the frequency of the medium-frequency pulse wave, the welding energy per time can be precisely controlled. Through the pressure sensor, high-precision control of the welding process can be achieved, which can ensure the accuracy of the welding position and the stability of the welding quality. Through the servo system, the welding pressure can be automatically adjusted, automatically adjusted according to the welding energy requirements, combined with adjusting the frequency of the medium-frequency pulse wave, and the energy can be accurately and smoothly output, and the welding quality reaches the best state. Therefore, the medium-frequency spot welding positioning mechanism of the moving contact of this circuit breaker has the advantages of simple structure, stable and reliable performance, high qualified rate of spot welding, and high spot welding efficiency.
[0006] Particularly, a positioning step cooperating with the moving contact holder is arranged on one side of the positioning fixture corresponding to the positioning groove. The positioning step is buckled on the moving contact holder, and a limiting fit between the positioning step and the moving contact holder is formed. The positioning step plays a limiting role on the moving contact holder, thereby ensuring that the positioning fixture can accurately position the moving contact holder at the spot welding position, which is beneficial to improving the spot welding quality of this spot welding positioning mechanism.
[0007] Particularly, two clamping blocks cooperating with the moving contact are respectively arranged on one side of the moving contact holder corresponding to the spot welding groove. The two clamping blocks respectively abut against the moving contact, and a clamping fit between the moving contact and the two clamping blocks is formed. The clamping blocks can press the moving contact tightly in the spot welding groove, thereby ensuring a more compact connection between the moving contact holder and the moving contact and ensuring the welding quality between the copper braided wire, moving contact, and moving contact holder.
[0008] Particularly, a convex portion for limiting and cooperating with the moving contact and copper braided wire is provided on one side of the moving contact holder. The convex portion plays a limiting role on the moving contact and copper braided wire, which can prevent the moving contact and copper braided wire from shifting, and is beneficial to improving the spot welding efficiency of this spot welding potential mechanism. Description of the Drawings
[0009] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.
[0010] Figure 2 It is an assembly drawing of the moving contact and the moving contact holder of an embodiment of the present invention. Detailed Embodiments
[0011] As Figure 1 、 2As shown in the figure, an intermediate frequency spot welding positioning mechanism for the moving contact of a circuit breaker according to an embodiment of the present invention includes an intermediate frequency servo spot welder 10, a positioning fixture 12 disposed between the upper electrode 101 and the lower electrode 102 corresponding to the intermediate frequency servo spot welder 10 and for placing the moving contact holder 11. The positioning fixture 12 is disposed on the lower electrode 102. A positioning groove 121 matching the moving contact holder 11 is provided on one side of the positioning fixture 12 facing the upper electrode 101. A positioning lug 110 matching the positioning groove 121 is provided on the moving contact holder 11. The positioning lug 110 is engaged in the positioning groove 121, and a clamping fit between the moving contact holder 11 and the positioning fixture 12 is formed. A spot welding groove 111 for placing the moving contact 13 and the copper braid 14 is provided directly below the upper electrode 101 of the intermediate frequency servo spot welder 10 on the moving contact holder 11. A positioning step 122 matching the moving contact holder 11 is provided on one side of the positioning fixture 12 corresponding to the positioning groove 121. The positioning step 122 is buckled on the moving contact holder 11, and a limiting fit between the positioning step 122 and the moving contact holder 11 is formed. The positioning step plays a limiting role on the moving contact holder, so as to ensure that the positioning fixture can accurately position the moving contact holder at the spot welding position, which is beneficial to improving the spot welding quality of the spot welding positioning mechanism. Two clamping blocks 112 matching the moving contact 13 are respectively provided on one side of the moving contact holder 11 corresponding to the spot welding groove 111. The two clamping blocks 112 respectively abut against the moving contact 13, and a clamping fit between the moving contact 13 and the two clamping blocks 112 is formed. The clamping blocks can press the moving contact in the spot welding groove, so as to ensure that the connection between the moving contact holder and the moving contact is more compact, and the welding quality of the copper braid, the moving contact and the moving contact holder can be ensured. A convex portion 113 for limiting and matching with the moving contact 13 and the copper braid 14 is provided on one side of the moving contact holder 11. The convex portion plays a limiting role on the moving contact and the copper braid, and can prevent the moving contact and the copper braid from shifting, which is beneficial to improving the spot welding efficiency of the spot welding potential mechanism.
[0012] The positioning fixture can accurately position the moving contact holder, the moving contact and the copper braid at the spot welding position, and the moving contact and the copper braid are placed in the spot welding groove of the moving contact holder. The upper electrode of the intermediate frequency servo spot welder can spot weld the copper braid and the moving contact on the moving contact holder at one time, and the spot welding efficiency is high. And the intermediate frequency servo spot welder adopts intermediate frequency inversion technology. By adjusting the intermediate frequency pulse wave frequency, the welding energy per time is accurately controlled; through the pressure sensor, the welding process is controlled with high precision, and the accuracy of the welding position and the stability of the welding quality can be ensured; through the servo system, the welding pressure is automatically adjusted and automatically adjusted according to the welding energy requirement, combined with adjusting the intermediate frequency pulse wave frequency, the energy is accurately and smoothly output, and the welding quality reaches the best state. Therefore, the intermediate frequency spot welding positioning mechanism for the moving contact of the circuit breaker has the advantages of simple structure, stable and reliable performance, high spot welding qualification rate and high spot welding efficiency.
Claims
1. An intermediate frequency spot welding positioning mechanism for a moving contact of a circuit breaker, characterized in that: It includes an intermediate frequency servo spot welder, a positioning fixture which is located between the upper electrode and the lower electrode corresponding to the intermediate frequency servo spot welder and is used for placing a moving contact holder. The positioning fixture is arranged on the lower electrode. A positioning groove which is matched with the moving contact holder is arranged on the side of the positioning fixture facing the upper electrode. A positioning convex block which is matched with the positioning groove is arranged on the moving contact holder. The positioning convex block is clamped in the positioning groove, and a clamping fit between the moving contact holder and the positioning fixture is formed. A spot welding groove for placing a moving contact and a copper braid is arranged on the moving contact holder corresponding to the position directly below the upper electrode of the intermediate frequency servo spot welder.
2. The intermediate frequency spot welding positioning mechanism of the moving contact of the circuit breaker according to claim 1, wherein: A positioning step which is matched with the moving contact holder is arranged on the side of the positioning fixture corresponding to the positioning groove. The positioning step is buckled on the moving contact holder, and a limiting fit between the positioning step and the moving contact holder is formed.
3. The intermediate frequency spot welding positioning mechanism of the moving contact of the circuit breaker according to claim 1 or 2, characterized in that: Two clamping blocks which are matched with the moving contact are respectively arranged on the side of the moving contact holder corresponding to the spot welding groove. The two clamping blocks respectively abut against the moving contact, and a clamping fit between the moving contact and the two clamping blocks is formed.
4. The medium-frequency spot welding positioning mechanism for the moving contact of the circuit breaker according to claim 1 or 2, characterized in that: A convex part which has a limiting fit with the moving contact and the copper braid is arranged on one side of the moving contact holder.