Circuit breaker output terminal welding positioning tool

Abstract

The utility model discloses a circuit breaker output terminal welding positioning tool, include: the inclined positioning seat is equipped with each other vertical and leans on the inclined plane and the support inclined plane, and the butt joint circuit breaker back and bottom respectively, welding positioning board, horizontal setting in the circuit breaker front side, three phase line positioning block, be located on the welding positioning board, and each phase line positioning block upper end is equipped with the phase line positioning groove for positioning phase line, three welding avoidance mouth, the through be located on the welding positioning board, make the phase line end portion after positioning expose above welding avoidance mouth, three terminal positioning groove, be located on the welding positioning board, and each terminal positioning groove with its corresponding welding avoidance mouth intercommunication, are used for positioning terminal, and expose its welding end in the range of welding avoidance mouth and cooperate with phase line end portion. The utility model can avoid the intervention of circuit breaker execution mechanism to B phase welding space when welding, make the welding operation space more abundant, be convenient for terminal welding, improve welding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker manufacturing technology, specifically to a welding and positioning fixture for circuit breaker output terminals. Background Technology

[0002] In circuit breakers, the phase conductors of phases A, B, and C are typically made of flexible copper braided wire (composed of numerous fine copper wires) to meet the bending requirements of internal wiring. Terminals for connecting external cables are welded to their ends, and these terminals are fixed to the circuit breaker housing as output terminals. During welding, molten solder penetrates the copper wire bundle and fuses with the terminal substrate, effectively eliminating tiny air gaps and oxide films between the copper wires and between the copper wires and the terminals, increasing the effective conductive contact area, and thus reducing contact resistance.

[0003] Due to the compact internal space of the circuit breaker, and the fact that the phase wires must pass sequentially through the smaller openings of their respective single-phase current transformers before converging through the larger opening of the residual current transformer, welding is typically performed after passing through the single-phase current transformers. Limited by the location of the residual current transformer opening and the surrounding structure, the middle B-phase wire can pass through directly in a straight line, while the A and C phases on either side must be bent at a certain angle to pass. Therefore, the B-phase terminals are welded to the ends of the phase wires along their length (i.e., the direction of the copper braided wire extension), while the A and C-phase terminals are welded along the width of the phase wires to accommodate the angle of connection with external cables after bending, ultimately ensuring that the three output terminals can be installed parallel and spaced on the housing.

[0004] In circuit breaker manufacturing, resistance spot welding machines are commonly used to simultaneously apply pressure and energize the phase wires and terminals on both the upper and lower sides. However, due to the constraints of the internal layout design of the circuit breaker (especially the location of the residual current transformer), the B-phase wire, which can pass through in a straight line without bending, is usually designed to be shorter, while the A and C phases need to be designed to be longer to meet the minimum bending radius requirements for bending. When the circuit breaker is placed vertically for welding, even if the B-phase wire is straightened as much as possible in the horizontal direction, its short length will still be interfered with by the circuit breaker housing (located above its welding position) and occupy the operating space of the resistance spot welding machine, making it difficult to weld the B-phase terminals and affecting the overall welding efficiency. Utility Model Content

[0005] Purpose of the utility model: To provide a welding positioning fixture for circuit breaker output terminals, which can avoid interference of the circuit breaker actuator on the welding space of phase B during welding, making the welding operation space more abundant, facilitating terminal welding, and improving welding efficiency.

[0006] Technical solution: A welding and positioning fixture for circuit breaker output terminals, comprising: The inclined positioning seat is used to fix the circuit breaker at an angle. It is provided with mutually perpendicular leaning inclined surfaces and supporting inclined surfaces, which respectively abut against the back and bottom of the circuit breaker. A welding positioning plate is horizontally installed on one side of the front of the circuit breaker. Three phase line positioning blocks are arranged in parallel on the welding positioning plate and correspond one-to-one with the three phase lines. Each phase line positioning block has a phase line positioning groove at its upper end for positioning the phase line. Three welding clearance openings are provided through the welding positioning plate. Each welding clearance opening is located at the end of the corresponding phase line positioning block away from the inclined surface, so that the positioned end of the phase line is exposed above the welding clearance opening. Three terminal positioning slots are provided on the welding positioning plate. Each terminal positioning slot is connected to its corresponding welding clearance opening. They are used to position the output terminal to be welded and expose its welding end within the range of the welding clearance opening to cooperate with the end of the phase line.

[0007] A further improvement of this utility model is that, among the three terminal positioning slots, the middle terminal positioning slot is arranged along the length direction of the corresponding phase line positioning slot, and the terminal positioning slots on both sides are arranged along the width direction of the corresponding phase line positioning slot.

[0008] A further improvement of this utility model is that a detachable pressure block is provided above the phase wire positioning groove, and a pressure strip is provided at the lower end of the pressure block to cooperate with the phase wire positioning groove, for pressing the phase wire tightly in the phase wire positioning groove.

[0009] A further improvement of this utility model is that the phase line positioning block is provided with positioning holes on both sides of the phase line positioning groove, and the lower end face of the pressure block is symmetrically provided with positioning posts that cooperate with the positioning holes.

[0010] A further improvement of this utility model is that side baffles are provided on both sides of the inclined surface and the supporting inclined surface, and the distance between the two side baffles is adapted to the width of the circuit breaker.

[0011] A further improvement of this utility model is that the inclined positioning seat is mounted on a moving mechanism, the moving mechanism including a frame, a first slide block controlled by a first driving member slidably connected to the platform of the frame along its length direction, a second slide block controlled by a second driving member slidably connected to the first slide block along the width direction of the platform, a vertical plate provided on the second slide block, a lifting seat controlled by a third driving member slidably connected to the surface of the vertical plate, the inclined positioning seat being mounted on the lifting seat, and the welding positioning plate being located outside the area directly above the platform.

[0012] A further improvement of this utility model is that the phase line positioning block is provided with a rotary pressing cylinder, the pressing end of the rotary pressing cylinder is provided with a pressing block, and the lower end of the pressing block is provided with a pressing strip that cooperates with the phase line positioning groove.

[0013] A further improvement of this utility model is that the angle between the inclined plane and the horizontal plane is 30°~75°.

[0014] A further improvement of this utility model is that the bottom of the terminal positioning groove is provided with an anti-jamming push hole. Beneficial effects

[0015] This utility model uses a tilted positioning seat to fix the circuit breaker at an angle. When the circuit breaker is changed from the traditional vertical placement to an inclined placement, its body and the circuit breaking actuator above it will deflect at an angle, thereby freeing up more operating space. At the same time, the B phase wire is supported by the phase wire positioning block, so its end welding point can be moved away from the physical obstruction formed by the actuator directly above, forming a front and rear spatial interval, providing operating space for the welding gun of the resistance spot welding machine. This avoids the problem of the B phase wire being interfered with by the circuit breaking actuator above due to its short length when the circuit breaker is placed vertically, making the welding operation space more abundant.

[0016] In this invention, a horizontally set welding positioning plate provides horizontal support for the phase lines. Three phase line positioning blocks and phase line positioning grooves ensure accurate positioning of the three phase lines. The welding clearance opening exposes the end of the phase line for easy welding. The terminal positioning groove aligns the output terminal with the end of the phase line within the welding clearance opening range, thereby improving the overall welding accuracy and efficiency.

[0017] This utility model adapts to different layout requirements for phase B lines passing through in a straight line and phase A and C lines passing through in a bent direction by setting the middle terminal positioning groove along the length of the phase line and the two side terminal positioning grooves along the width of the phase line, ensuring that the terminal welding direction is consistent with the requirements.

[0018] This utility model uses a detachable pressure block and pressure bar to press the phase wire tightly into the phase wire positioning groove, preventing the phase wire from moving or loosening during welding, ensuring the stability of the welding position, and improving the welding quality. At the same time, the detachable pressure block facilitates assembly, disassembly and maintenance, enhancing the practicality of the tooling.

[0019] This invention features an anti-jamming push hole to facilitate the ejection of terminals from below after welding, and provides an ejection channel to prevent terminals from getting stuck in the positioning groove, thus ensuring smooth continuous production. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2This is a partially enlarged three-dimensional structural diagram of the present invention.

[0022] Figure 3 This is a partially enlarged side view of the structure of this utility model (the side baffle is not shown in the figure).

[0023] Figure 4 This is a partially enlarged top view of the structure of this utility model.

[0024] Figure 5 This is a partially enlarged schematic diagram of the terminal positioning groove structure of this utility model.

[0025] In the diagram, 1-slanted positioning seat, 2-leaning inclined surface, 3-supporting inclined surface, 4-welding positioning plate, 5-phase wire positioning block, 6-phase wire positioning groove, 7-welding clearance opening, 8-terminal positioning groove, 11-positioning hole, 13-side baffle, 14-frame, 15-first slide, 16-second slide, 17-lifting seat, 18-anti-jamming push hole, 19-phase wire, 20-output terminal. Detailed Implementation

[0026] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1: Combination Figures 1-5 It can be seen that a circuit breaker output terminal welding positioning fixture includes: The inclined positioning seat 1 is used to fix the circuit breaker at an angle. It is provided with mutually perpendicular leaning inclined surfaces 2 and supporting inclined surfaces 3, which respectively abut against the back and bottom of the circuit breaker. Welding positioning plate 4 is horizontally set on one side of the front of the circuit breaker; Three phase line positioning blocks 5 are arranged in parallel on the welding positioning plate 4 and correspond one-to-one with the three phase lines. Each phase line positioning block 5 has a phase line positioning groove 6 at its upper end for positioning the phase line. Three welding clearance openings 7 are provided through the welding positioning plate 4. Each welding clearance opening 7 is located at the end of its corresponding phase line positioning block 5 away from the inclined surface 2, so that the end of the positioned phase line is exposed above the welding clearance opening 7. Three terminal positioning slots 8 are provided on the welding positioning plate 4. Each terminal positioning slot 8 is connected to its corresponding welding clearance port 7. It is used to position the output terminal to be welded and expose its welding end within the range of the welding clearance port 7 to cooperate with the end of the phase line.

[0028] In this embodiment, the three terminal positioning slots 8 are designed with a compact layout: the middle terminal positioning slot 8 is arranged along the length direction of the corresponding phase line positioning slot 6, and the terminal positioning slots 8 on both sides are arranged along the width direction of the corresponding phase line positioning slot 6. This can accommodate different layout requirements inside the circuit breaker, such as the B phase line passing through in a straight line and the A and C phase lines passing through in a bent direction, ensuring that the terminal welding direction is consistent with the actual installation requirements. Of course, for circuit breakers that do not require this layout, the terminal positioning slots 8 can also be arranged all along the length direction of the phase line positioning slot 6 as needed.

[0029] A detachable pressure block (not shown in the figure) is provided above the phase wire positioning groove 6, and a pressure strip is provided at the lower end of the pressure block to cooperate with the phase wire positioning groove 6, which is used to press the phase wire tightly in the phase wire positioning groove 6. Preferably, positioning holes 11 are provided on the phase wire positioning block 5 on both sides of the phase wire positioning groove 6, and positioning posts that cooperate with the positioning holes 11 are symmetrically provided on the lower end surface of the pressure block.

[0030] Side baffles 13 are provided on both sides of the inclined surface 2 and the supporting inclined surface 3. The distance between the two side baffles 13 is adapted to the width of the circuit breaker to limit the displacement of the circuit breaker in the width direction. The side baffles 13 are preferably fixedly connected to the body of the inclined positioning seat 1 by bolts.

[0031] Preferably, the welding positioning plate 4 is fixed by the extension of the side baffle 13, so that it maintains a stable relative position with the inclined positioning seat 1.

[0032] In this embodiment, the circuit breaker is changed from its traditional vertical placement to an inclined fixation by using an inclined positioning seat. This attitude adjustment causes the circuit breaker body and the circuit breaking actuator above it to deflect at the same angle, thereby effectively freeing up the area required for welding operations. For phase B, after being supported by the phase line positioning block, the end welding point is able to move away from the area directly below the actuator in the vertical state in the front-back direction, forming a front-back spatial interval, making the welding operation space more ample.

[0033] The design is based on the angle between the inclined plane and the horizontal plane to ensure sufficient clearance between the circuit breaker's actuator and the B-phase welding point. Preferably, this angle is 30° to 75°. This effectively avoids the obstruction of the B-phase welding point by the actuator on top of most common circuit breaker models, while ensuring the stability of the circuit breaker's placement on the fixture.

[0034] The terminal positioning slot 8 must be dimensional along its length to ensure that when a terminal is placed therein, more than half of its length (i.e., more than half the total length of the terminal) is embedded in the slot. This ensures the stability of the terminal within the slot and prevents it from accidentally falling out along its length during subsequent operations or soldering. Simultaneously, the opening design of the terminal positioning slot 8 should ensure that the non-soldered end of the terminal (the end used to connect external cables) is easily exposed for operation or subsequent use.

[0035] The bottom of the terminal positioning groove 8 is provided with an anti-jamming push hole 18. Preferably, the diameter of the anti-jamming push hole 18 is larger than the diameter of the connection hole between the terminal and the external cable. After welding, a push rod or other tool can be inserted through the anti-jamming push hole 18 to apply external force to push the welded terminal out of the terminal positioning groove 8, preventing the terminal from getting stuck in the groove due to welding heat deformation or excessive tightness, and making it easier to remove the workpiece.

[0036] Example 2: This example has a structure that is largely the same as that of Example 1, except that: The phase line positioning block 5 is equipped with a rotary pressing cylinder (not shown in the figure), and the pressing end of the rotary pressing cylinder is equipped with a pressing block, and the lower end of the pressing block is equipped with a pressing strip that cooperates with the phase line positioning groove 6.

[0037] The cylinder body of the rotary pressing cylinder is fixed on the welding positioning plate 4 or the phase line positioning block 5 by the mounting base. The rotary pressing cylinder is driven by an external air source (such as an air compressor) and a conventional control system (such as a solenoid valve) to realize the automatic rotation, pressing and lifting of the pressing block.

[0038] Compared to Example 1, this embodiment uses a rotating downward cylinder to automatically drive the pressure block to clamp the phase wire, replacing manual clamping. This achieves automatic and rapid clamping and release of the phase wire, reducing manual intervention and lowering labor intensity.

[0039] The other structures are the same as in Example 1, and will not be described in detail here.

[0040] Example 3: This example has a structure that is largely the same as that of Example 1, except that: The inclined positioning seat 1 is mounted on the moving mechanism, which includes a frame 14. A first slide 15, controlled by a first driving element (such as a ball screw pair driven by a servo motor or a cylinder), is slidably connected to the table surface of the frame 14 along its length direction. A second slide 16, controlled by a second driving element (such as a ball screw pair driven by a servo motor or a cylinder), is slidably connected to the first slide 15 along the width direction of the table surface. A vertical plate is provided on the second slide 16. A lifting seat 17, controlled by a third driving element (such as a ball screw pair driven by a servo motor or a cylinder), is slidably connected to the surface of the vertical plate. The inclined positioning seat 1 is mounted on the lifting seat 17, and the welding positioning plate 4 is located outside the area directly above the table surface.

[0041] In this embodiment, the aforementioned moving mechanism drives the inclined positioning seat 1 and the fixed circuit breaker to move in three-dimensional space, aiming to work in conjunction with the fixedly installed resistance spot welding machine. After the circuit breaker, phase wires, and terminals are clamped and positioned, the moving mechanism drives the circuit breaker to move sequentially according to a preset program, so that the connection point of each phase wire and terminal (i.e., the position above the welding clearance 7) moves to the welding gun position of the resistance spot welding machine. When the welding point is in place, the upper and lower welding gun electrodes of the resistance spot welding machine move towards each other simultaneously from above and below the workpiece, clamping the phase wire end exposed at the welding clearance 7 and the terminal welding end. Then, a strong current is applied, and the phase wire and terminal welding point are welded together using the principle of resistance heating.

[0042] It should be noted that the way the moving mechanism involved in this embodiment receives instructions and moves (e.g., controlled by a programmable logic controller (PLC) or numerical control system according to preset coordinates) is a conventional application technology of automation control. It does not involve any improvement to the moving mechanism control program or the system itself.

[0043] Resistance spot welding machines and their welding methods, which involve applying pressure and electricity simultaneously from both the top and bottom, are existing and mature technologies in the circuit breaker manufacturing field, and do not involve any improvements to the resistance spot welding machine itself. Preferably, a pneumatic spot welding machine (a resistance spot welding machine using pneumatic pressurization) is selected as the resistance spot welding machine.

[0044] Compared to Embodiment 1, this embodiment uses a moving mechanism to move the inclined positioning seat and the circuit breaker fixed on it in three-dimensional space. This can automatically move each welding point of the circuit breaker to the welding gun station of the resistance spot welding machine in a fixed position, reducing the time spent on repeated manual adjustments of the workpiece and improving overall production efficiency and automation.

[0045] The other structures are the same as in Example 1, and will not be described in detail here.

[0046] The working principle of the circuit breaker output terminal welding positioning fixture provided by this utility model is as follows: In use, first, place the circuit breaker at an angle on the inclined positioning base 1, ensuring its back and bottom are in contact with the leaning inclined surface 2 and the supporting inclined surface 3 respectively, with the sides limited by the side baffles 13. Then, place the three phase wires of the circuit breaker into the corresponding phase wire positioning slots 6 of the phase wire positioning blocks 5, and use detachable pressure blocks or an automatic cylinder to press and fix the phase wires. Next, place the output terminals to be welded into the corresponding terminal positioning slots 8, ensuring precise alignment of the welding end of the terminal with the end of the phase wire within the area of ​​the welding clearance opening 7, thus completing the welding and positioning operation of the circuit breaker output terminals.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

[0048] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A welding and positioning fixture for circuit breaker output terminals, characterized in that, include: The inclined positioning seat (1) is used to fix the circuit breaker at an angle. It is provided with mutually perpendicular leaning inclined surfaces (2) and supporting inclined surfaces (3), which respectively abut against the back and bottom of the circuit breaker. Welding positioning plate (4) is horizontally set on one side of the front of the circuit breaker; Three phase line positioning blocks (5) are arranged in parallel on the welding positioning plate (4) and correspond one-to-one with the three phase lines. Each phase line positioning block (5) has a phase line positioning groove (6) at its upper end for positioning the phase line. Three welding clearance openings (7) are provided through the welding positioning plate (4). Each welding clearance opening (7) is located at the end of its corresponding phase line positioning block (5) away from the inclined surface (2), so that the end of the positioned phase line is exposed above the welding clearance opening (7). Three terminal positioning slots (8) are provided on the welding positioning plate (4). Each terminal positioning slot (8) is connected to its corresponding welding clearance port (7) for positioning the output terminal to be welded and exposing its welding end within the range of the welding clearance port (7) to cooperate with the end of the phase line.

2. The circuit breaker output terminal welding positioning fixture according to claim 1, characterized in that: Of the three terminal positioning slots (8), the middle terminal positioning slot (8) is arranged along the length direction of the corresponding phase line positioning slot (6), and the two side terminal positioning slots (8) are arranged along the width direction of the corresponding phase line positioning slot (6).

3. A welding and positioning fixture for circuit breaker output terminals according to claim 1 or 2, characterized in that: A detachable pressure block is provided above the phase line positioning groove (6), and a pressure strip is provided at the lower end of the pressure block to cooperate with the phase line positioning groove (6) for pressing the phase line into the phase line positioning groove (6).

4. The circuit breaker output terminal welding positioning fixture according to claim 3, characterized in that: Positioning holes (11) are provided on the phase line positioning block (5) on both sides of the phase line positioning groove (6), and positioning posts that cooperate with the positioning holes (11) are symmetrically provided on the lower end face of the pressure block.

5. The circuit breaker output terminal welding positioning fixture according to claim 1, characterized in that: Side baffles (13) are provided on both sides of the inclined surface (2) and the supporting inclined surface (3), and the distance between the two side baffles (13) is adapted to the width of the circuit breaker.

6. The circuit breaker output terminal welding positioning fixture according to claim 1, characterized in that: The inclined positioning seat (1) is mounted on the moving mechanism, which includes a frame (14). A first slide (15) controlled by a first driving member is slidably connected on the table surface of the frame (14) along its length direction. A second slide (16) controlled by a second driving member is slidably connected on the first slide (15) along the width direction of the table surface. A vertical plate is provided on the second slide (16). A lifting seat (17) controlled by a third driving member is slidably connected on the surface of the vertical plate. The inclined positioning seat (1) is mounted on the lifting seat (17). The welding positioning plate (4) is located outside the area directly above the table surface.

7. The circuit breaker output terminal welding positioning fixture according to claim 1, characterized in that: The phase line positioning block (5) is provided with a rotary pressing cylinder, and the pressing end of the rotary pressing cylinder is provided with a pressing block, and the lower end of the pressing block is provided with a pressing strip that cooperates with the phase line positioning groove (6).

8. A welding and positioning fixture for circuit breaker output terminals according to claim 1 or 5, characterized in that: The angle between the inclined plane (2) and the horizontal plane is 30°~75°.

9. The circuit breaker output terminal welding positioning fixture according to claim 1, characterized in that: The bottom of the terminal positioning groove (8) is provided with an anti-jamming push hole (18).

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