A movable contact assembly assembly jig for a molded case circuit breaker

Abstract

The utility model belongs to the field of moulded case circuit breaker, concretely relates to a moulded case circuit breaker's movable contact subassembly assembly fixture, including mechanism frame and gear and handle assembly and briquetting, briquetting is arranged on mechanism frame and slides, sets up the drive portion that touches on the pressing plate on briquetting one end, is provided with the gear rack portion that engages with gear on briquetting, briquetting rotates with gear and reciprocatingly slides on mechanism frame, this assembly fixture adopts gear transmission structure design, and the structure design is simple, and operation is more convenient, can effectively reduce the labor intensity, briquetting is engaged with gear through gear rack portion, is favorable for improving transmission accuracy and repeat positioning accuracy, the engagement characteristic of gear transmission can realize strict transmission ratio, ensure the accuracy of briquetting's action, and can reduce the stroke error when briquetting reverse movement, improve repeat positioning accuracy.

Description

Technical Field

[0001] This utility model belongs to the technical field of molded case circuit breakers, specifically relating to an assembly fixture for the moving contact assembly of a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are electrical protection devices with plastic housings. They are mainly used for long-delay overload protection and short-circuit instantaneous protection. They also feature strong breaking capacity, convenient installation, and high cost-effectiveness, and are widely used in industrial, commercial, and residential power distribution systems.

[0003] Existing molded case circuit breaker moving contact assemblies include a rotating shaft, moving contact, contact spring, pressure plate, and positioning shaft. During assembly, the pressure plate presses the contact spring into the rotating shaft, and then the positioning shaft is inserted laterally into the pressure plate and rotating shaft to fix the pressure plate within the rotating shaft, thus completing the contact spring assembly. Because the contact spring has a large elastic force, it is difficult to hold the pressure plate in place by hand, resulting in low assembly efficiency, high labor intensity, and difficulty in guaranteeing assembly quality. Therefore, designing a moving contact assembly assembly fixture is essential. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a high-efficiency assembly fixture for the moving contact assembly of a molded case circuit breaker.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a moving contact assembly assembly fixture for a molded case circuit breaker, comprising a frame for placing the moving contact assembly, a gear rotatably mounted on the frame, a handle assembly for driving the gear to rotate, and a pressure block for driving the moving contact assembly to press the contact spring. The pressure block is slidably mounted on the frame, and a driving part abutting against the pressure plate is provided on one end of the pressure block. The pressure block is provided with a rack part that meshes with the gear. The pressure block rotates with the gear and slides back and forth on the frame.

[0006] In some embodiments, two drive arms are symmetrically distributed on the drive unit, and two positioning grooves that cooperate with the two drive arms are provided on the pressure plate, with the two drive arms respectively abutting in the two positioning grooves.

[0007] In some embodiments, the handle assembly includes a drive block linked to the shaft of the gear and a handle rotatably mounted on the drive block, and a limiting plate that cooperates with the handle for limiting is provided on the mechanism frame.

[0008] In some embodiments, one end of the drive block is provided with a through hole through which a rotating shaft can pass, a limiting groove is provided in the through hole, and a limiting protrusion is provided on the rotating shaft that engages with the limiting groove.

[0009] In some embodiments, the gear is provided with a connecting hole through which a rotating shaft can pass, and the connecting hole is provided with a groove that engages with a limiting protrusion.

[0010] In some embodiments, two connecting plates are symmetrically distributed at the other end of the drive block, and an accommodating space for inserting a handle is formed between the two connecting plates. One end of the handle is provided with a connecting shaft, and the two ends of the connecting shaft are respectively connected to two positioning holes in the connecting plate.

[0011] In some embodiments, the mechanism frame is provided with a guide groove that cooperates with the pressure block, and the other end of the pressure block has a guide portion that cooperates with the guide groove, and the guide portion is slidably disposed in the guide groove.

[0012] In some embodiments, the mechanism frame is provided with a slot communicating with the guide groove, and the rack portion of the pressure block extends into the slot.

[0013] In some embodiments, the frame is provided with a receiving groove for placing the moving contact assembly, the shape of which matches the shape of the rotating shaft of the moving contact assembly.

[0014] In some embodiments, the mechanism frame is provided with a relief groove communicating with the receiving groove, and the moving contact of the moving contact assembly is inserted into the relief groove.

[0015] The beneficial effects of this utility model are as follows: This assembly fixture adopts a gear transmission structure design, which is simple in structure, more convenient to operate, and can effectively reduce labor intensity. The pressure block meshes with the gear through the rack, which helps to improve transmission accuracy and repeatability. The meshing characteristics of the gear transmission can achieve a strict transmission ratio, ensuring the accuracy of the pressure block's movement, and can reduce the backlash error when the pressure block moves in the reverse direction, thus improving repeatability. During assembly, the handle assembly drives the gear to rotate, and the gear drives the pressure block to move through the rack. The driving part of the pressure block drives the pressure plate to move, and the pressure plate presses the contact spring into the rotating shaft (assembly station). Then, the positioning shaft of the moving contact assembly is inserted between the rotating shaft and the pressure plate, so that the pressure plate can press the contact spring tightly in the assembly station, thus completing the assembly of the contact spring of the moving contact assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of an embodiment of the present utility model;

[0019] Figure 3 This is a perspective view of the assembly fixture in an embodiment of the present utility model. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0024] like Figure 1-3As shown, a moving contact assembly fixture for a molded case circuit breaker includes a frame 2 for placing the moving contact assembly 1, a gear 3 rotatably mounted on the frame 2, a handle assembly 4 for driving the gear 3 to rotate, and a pressure plate 11 for driving the moving contact assembly 1 to press against the contact spring 12. The pressure block 5 is slidably mounted on the frame 1, with a driving part 51 at one end of the pressure block 5 abutting against the pressure plate 11. The pressure block 5 has a rack part 52 that meshes with the gear 3. The pressure block 5 rotates with the gear 3 and slides back and forth on the frame 2. This assembly fixture adopts a gear transmission structure design, which is simple in design, more convenient to operate, and can effectively reduce labor intensity. The meshing of the pressure block with the gear through the rack part is beneficial to improving transmission accuracy and repeatability. The meshing characteristics of the gear transmission can achieve a strict transmission ratio, ensuring the accuracy of the pressure block's movement, and can reduce the backlash error when the pressure block moves in the opposite direction, thus improving repeatability. During assembly, the handle assembly 4 drives the gear 3 to rotate, and the gear 3 drives the pressure block 5 to move through the rack part 52. The driving part 51 of the pressure block 5 drives the pressure plate 11 to move. The pressure plate 11 presses the contact spring 12 into the rotating shaft 13 (assembly station). Then, the positioning shaft 130 of the moving contact assembly 1 is inserted between the rotating shaft 13 and the pressure plate 11, so that the pressure plate 11 can press the contact spring 12 tightly in the assembly station, thus completing the assembly of the contact spring 12 of the moving contact assembly 1.

[0025] like Figure 2 As shown, the drive unit 51 has two symmetrically distributed drive arms 511, and the pressure plate 11 is provided with two positioning grooves 111 that cooperate with the two drive arms 511. The two drive arms 511 abut against the two positioning grooves 111 respectively. By having the two drive arms abut against the two positioning grooves, the drive unit can reliably drive the pressure plate to move, and the pressure plate can reliably press the contact spring into the rotating shaft, resulting in higher operational reliability.

[0026] like Figure 1 and 2As shown, the handle assembly 4 includes a drive block 41 linked to the rotating shaft 31 of the gear 3 and a handle 42 rotatably mounted on the drive block 41. A limiting plate 43, which engages with the handle 42, is provided on the frame 2. The limiting plate limits the handle. During assembly, the handle drives the gear to rotate via the drive block, which in turn drives the pressure block. When the pressure block presses the contact spring into the assembly position via the pressure plate, the handle can be engaged with the limiting plate. This facilitates the assembly personnel inserting the positioning shaft into the pressure plate and the rotating shaft, improving the assembly efficiency of the moving contact assembly. One end of the drive block 41 has a through hole 411 through which the rotating shaft 31 passes. A limiting groove 412 is provided within the through hole 411, and the rotating shaft 31 has a limiting protrusion 311 that engages within the limiting groove 412. The rotating shaft is engaged with the limiting groove of the drive block via the limiting protrusion, facilitating the assembly of the rotating shaft and the drive block, resulting in higher assembly efficiency. The gear 3 is provided with a connecting hole 32 through which the rotating shaft 31 can pass. A groove 321 is provided within the connecting hole 32 to engage with the limiting protrusion 311. The rotating shaft is engaged in the groove of the gear via the limiting protrusion, facilitating the assembly of the gear and the rotating shaft and improving assembly efficiency. Two connecting plates 413 are symmetrically distributed at the other end of the drive block 41. A receiving space 410 is formed between the two connecting plates 413, allowing the handle 42 to be inserted. One end of the handle 42 is provided with a connecting shaft 421, with both ends of the connecting shaft 421 connected to two positioning holes 4131 in the connecting plate 413. The handle is connected to the drive block via the connecting shaft, facilitating the assembly of the handle and the drive block. The mechanism frame 2 is provided with a guide groove 21 that cooperates with the pressure block 5. The other end of the pressure block 5 has a guide portion 53 that cooperates with the guide groove 21, and the guide portion 53 is slidably disposed within the guide groove 21. The pressure block is slidably positioned within the guide groove via a guide portion, facilitating assembly between the pressure block and the mechanism frame and ensuring reliable operation of the pressure block on the mechanism frame. The mechanism frame 2 has a slot 22 communicating with the guide groove 21, and the rack portion 52 of the pressure block 5 extends within the slot 22. The rack portion of the pressure block extending within the slot facilitates assembly between the rack portion and the gear, making assembly more convenient. The mechanism frame 2 has a receiving slot 23 for placing the moving contact assembly 1, the shape of which matches the shape of the rotating shaft 13 of the moving contact assembly 1. The receiving slot positions the rotating shaft of the moving contact assembly, ensuring reliable engagement of the rotating shaft onto the mechanism frame. The mechanism frame 2 has a clearance slot 24 communicating with the receiving slot 23, and the moving contact 14 of the moving contact assembly 1 passes through the clearance slot 24. The clearance slot facilitates placement of the moving contact, allowing assemblers to reliably place the moving contact assembly onto the mechanism frame.

[0027] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A jig for assembling the moving contact assembly of a molded case circuit breaker, characterized in that: The device includes a frame for placing a moving contact assembly, a gear rotatably mounted on the frame, a handle assembly for driving the gear to rotate, and a pressure block for driving the moving contact assembly to press the contact spring with a pressure plate. The pressure block is slidably mounted on the frame, and one end of the pressure block is provided with a driving part that abuts against the pressure plate. The pressure block is provided with a rack part that meshes with the gear. The pressure block rotates with the gear and slides back and forth on the frame.

2. The moving contact assembly fixture for a molded case circuit breaker according to claim 1, characterized in that: The drive unit has two drive arms symmetrically distributed on it, and the pressure plate is provided with two positioning grooves that cooperate with the two drive arms. The two drive arms respectively abut against the two positioning grooves.

3. The moving contact assembly jig for a molded case circuit breaker according to claim 1 or 2, characterized in that: The handle assembly includes a drive block that is linked to the shaft of the gear and a handle that is rotatably mounted on the drive block. The mechanism frame is provided with a limiting plate that cooperates with the handle for limiting.

4. The moving contact assembly jig for a molded case circuit breaker according to claim 3, characterized in that: The drive block has a through hole at one end for the rotating shaft to pass through, a limiting groove is provided in the through hole, and a limiting protrusion is provided on the rotating shaft to engage with the limiting groove.

5. The moving contact assembly jig for a molded case circuit breaker according to claim 4, characterized in that: The gear is provided with a connecting hole through which the rotating shaft can pass, and the connecting hole is provided with a groove that engages with the limiting protrusion.

6. The moving contact assembly jig for a molded case circuit breaker according to claim 4, characterized in that: The other end of the drive block has two symmetrically distributed connecting plates, and a space for inserting a handle is formed between the two connecting plates. One end of the handle is provided with a connecting shaft, and the two ends of the connecting shaft are respectively connected to two positioning holes in the connecting plate.

7. The moving contact assembly jig for a molded case circuit breaker according to claim 1, characterized in that: The mechanism frame is provided with a guide groove that cooperates with the pressure block, and the other end of the pressure block has a guide part that cooperates with the guide groove. The guide part is slidably disposed in the guide groove.

8. The moving contact assembly jig for a molded case circuit breaker according to claim 7, characterized in that: The mechanism frame is provided with a slot that communicates with the guide groove, and the rack portion of the pressure block extends into the slot.

9. The moving contact assembly jig for a molded case circuit breaker according to claim 1, characterized in that: The frame is provided with a receiving groove for placing the moving contact assembly, and the shape of the receiving groove matches the shape of the rotating shaft of the moving contact assembly.

10. The moving contact assembly jig for a molded case circuit breaker according to claim 9, characterized in that: The mechanism frame is provided with a clearance groove that communicates with the receiving groove, and the moving contact of the moving contact assembly is inserted into the clearance groove.

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