A circuit breaker terminal anti-loosening structure

Abstract

The utility model provides a circuit breaker wiring terminal anti -loose structure relates to circuit breaker technical field, include: circuit breaker, the circuit breaker main body is adjacent to the wiring terminal right side part rotation installation has the insulating block, when the insulating block rear end surface and the circuit breaker main body are pasted and contact, the insulating block completely covers and shields the wiring terminal part, the utility model discloses through the rotation insulating block makes it cover wiring terminal, has realized the physical isolation to the terminal, has avoided the direct contact of non -working personnel effectively, has reduced the safety risk such as electric shock, at the same time, the cam blocking block on the insulating block cooperates with the blocking slot on the circuit breaker main body, limits its rotation after the insulating block closes, further strengthens the protection effect to the wiring terminal, guarantees the safety of equipment operating environment, solves the problem that the existing circuit breaker wiring terminal only depends on the thread friction of screw itself or simple spring washer and carries out the anti -loose, lacks the dynamic vibration anti -loose design.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker terminal anti-loosening structure. Background Technology

[0002] In power systems, circuit breakers are critical protective devices, and the stability of their terminals is paramount. However, in real-world applications such as industrial sites and substations, equipment is subjected to prolonged exposure to multi-source external forces—such as continuous vibrations from transformers and motors. These vibrations are transmitted to the circuit breaker terminals, and this prolonged external force gradually offsets the initial tightening force on the screws used to secure the wires, leading to a "gradual loosening" of the screws. Once the terminals loosen, it can trigger a chain reaction of safety hazards and operational problems. When the contact area between the terminal and the wire decreases, the contact resistance increases exponentially, leading to a sharp rise in local temperature. Loose terminals can cause unstable circuit connections, affecting the normal operation of equipment. Existing circuit breaker terminals rely solely on the thread friction of the screw itself or simple spring washers for anti-loosening, lacking anti-loosening designs for dynamic vibrations. They are unable to resist the problem of screw loosening under long-term external force interference, and have significant deficiencies in anti-loosening reliability and long-term effectiveness, failing to fully meet the power system's requirements for high stability and high safety. Utility Model Content

[0003] This utility model relates to an anti-loosening structure for circuit breaker terminals, which solves the problem that existing circuit breaker terminals rely solely on the thread friction of the screw itself or simple spring washers for anti-loosening, and lack anti-loosening design for dynamic vibration.

[0004] This utility model provides an anti-loosening structure for circuit breaker terminals, specifically including: a circuit breaker, wherein an isolating block is rotatably installed on the right side of the circuit breaker body adjacent to the terminal, and a reciprocating cavity with a circular cavity structure is opened inside the isolating block; when the rear end face of the isolating block is in contact with the circuit breaker body, the isolating block completely covers and blocks the terminal part, and at this time the reciprocating cavity and the terminal are in a coaxial state; a threaded drive hole penetrating the rear end face of the isolating block is opened at the axial center of the rear end face of the reciprocating cavity; a limiting circular plate with the same diameter as the reciprocating cavity is slidably installed in the reciprocating cavity, the thickness of the limiting circular plate is less than the width of the reciprocating cavity, and an anti-loosening stud is fixedly installed at the axial center of the rear end face of the limiting circular plate, and the anti-loosening stud is threadedly connected to the threaded drive hole; when the rear end of the anti-loosening stud contacts the fixing bolt used to clamp the wire inside the circuit breaker terminal, the rear end face of the limiting circular plate does not contact the rear end face of the reciprocating cavity.

[0005] Furthermore, a insertion hole is provided at the axial center of the front side of the reciprocating moving cavity, penetrating the front end face of the isolation block. The insertion hole is a round hole with a diameter smaller than that of the reciprocating moving cavity. A screw head is installed at the axial center of the front end face of the limiting circular plate. The specifications and dimensions of the screw head are consistent with those of the screw head of the fixing bolt used to clamp the wire inside the circuit breaker terminal block, and the diameter of the screw head is consistent with the diameter of the insertion hole.

[0006] Furthermore, the left side of the rear end face of the isolation block has two symmetrically arranged blocking and fitting storage slots, the cross-section of which is a superior arc circle structure; the left side of the circuit breaker body adjacent to the terminal block has two symmetrically arranged blocking slots, the cross-section of which is a inferior arc circle structure; when the rear end face of the isolation block is in contact with the circuit breaker body, the blocking slots and blocking and fitting storage slots are positioned correspondingly, and at this time the blocking slots and blocking and fitting storage slots together form a complete circular structure.

[0007] Furthermore, the left end face of the isolation block has a rotating hole that communicates with the axis of the blocking and receiving groove. A rotating shaft matching its structural dimensions is rotatably installed in the rotating hole. A cam blocking block coaxially arranged with the cam blocking block is fixedly installed on the right end face of the rotating shaft. The cam blocking block is located inside the blocking and receiving groove. When the protruding end of the cam blocking block faces the rear side, the protruding end of the cam blocking block is located inside the blocking slot.

[0008] Furthermore, a hexagonal block is fixedly installed on the left end face of the rotating shaft, and one side end face of the rotating block facing the same direction as the protruding end of the cam blocking block adopts an inclined surface structure.

[0009] This utility model provides a circuit breaker terminal anti-loosening structure, which has the following beneficial effects: This invention achieves physical isolation of the terminals by rotating the insulating block to cover them, effectively preventing direct contact by non-staff members and reducing safety risks such as electric shock. At the same time, the cam blocking block on the insulating block cooperates with the blocking slot on the circuit breaker body to restrict its rotation after the insulating block is closed, further enhancing the protection effect on the terminals and ensuring the safety of the equipment operating environment.

[0010] This utility model utilizes a screw head with the same specifications as the screw head of the internal fixing bolt of the terminal block, in conjunction with a limiting circular plate and an anti-loosening stud. After the insulating block covers the terminal block, the anti-loosening stud is tightened against the fixing bolt by turning the screw head. This design can effectively counteract the loosening tendency of the fixing bolt caused by factors such as vibration and thermal expansion and contraction, ensuring that the terminal block maintains a stable connection for a long time, improving the reliability of the circuit connection, and reducing equipment failures and safety hazards caused by loose wiring.

[0011] The operation of this anti-loosening structure is simple and easy to understand. Workers only need to follow the steps of first fixing the wire, then closing the isolation block, and then turning the screw head to complete the wiring and anti-loosening operation. Furthermore, when it is necessary to inspect or maintain the wiring, the position of the cam isolation block can be quickly determined by touching the inclined surface on the rotating block, making it convenient to unlock and open the isolation block for operation, reducing maintenance difficulty and improving work efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0013] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the present invention.

[0014] In the attached diagram: Figure 1 A schematic diagram of the left-side axial structure of this utility model is shown; Figure 2 A schematic diagram of the right-side axial structure of this utility model is shown; Figure 3 This shows a schematic diagram of the left end isometric structure of the isolation block in its rotated and unfolded state according to this utility model; Figure 4 This utility model illustrates Figure 3 A structural diagram showing the transfer block and screw head in their disassembled state; Figure 5 This utility model illustrates Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This utility model illustrates Figure 4 Axonometric view of the right end structure; Figure 7 This diagram shows a partial enlarged cross-sectional view of the reciprocating moving cavity of the present invention. Figure 8 This diagram shows a partial enlarged cross-sectional view of the barrier-fitting storage groove portion of the present invention; Figure 9 This utility model illustrates Figure 8 Enlarged sectional view of the middle BB structure; List of reference numerals 1. Circuit breaker; 101. Isolation slot; 2. Isolation block; 201. Insertion hole; 202. Threaded drive hole; 203. Isolation fitting storage groove; 204. Rotation hole; 205. Reciprocating moving cavity; 3. Rotating block; 301. Cam isolation block; 302. Rotating shaft; 4. Screw head; 401. Anti-loosening stud; 402. Limiting round plate. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Example: Please refer to Figures 1 to 9 : This utility model proposes an anti-loosening structure for circuit breaker terminals, comprising: a circuit breaker 1; an isolating block 2 rotatably mounted on the right side of the circuit breaker 1 body adjacent to the terminal; the isolating block 2 has a reciprocating cavity 205 with a circular cavity structure inside; when the rear end face of the isolating block 2 is in contact with the circuit breaker 1 body, the isolating block 2 completely covers and blocks the terminal part, and at this time the reciprocating cavity 205 and the terminal are coaxial; a threaded drive hole 202 penetrating the rear end face of the isolating block 2 is provided on the axial part of the rear side of the reciprocating cavity 205; a limiting circular plate 402 with the same diameter is slidably mounted in the reciprocating cavity 205, the thickness of the limiting circular plate 402 is less than the width of the reciprocating cavity 205, and the axial part of the rear end face of the limiting circular plate 402 is fixedly mounted. A locking stud 401 is installed, which is threadedly connected to the threaded drive hole 202. When the rear end of the locking stud 401 contacts the fixing bolt used to clamp the wire inside the terminal of the circuit breaker 1, the rear end face of the limiting circular plate 402 does not contact the rear side of the inner end of the reciprocating moving cavity 205. A insertion hole 201 penetrating the front end face of the isolation block 2 is provided at the axial center of the inner end of the reciprocating moving cavity 205. The insertion hole 201 is a circular hole with a diameter smaller than that of the reciprocating moving cavity 205. A screw head 4 is installed at the axial center of the front end face of the limiting circular plate 402. The specifications and dimensions of the screw head 4 are consistent with the specifications and dimensions of the screw head of the fixing bolt used to clamp the wire inside the terminal of the circuit breaker 1, and the diameter of the screw head 4 is consistent with the diameter of the insertion hole 201.

[0017] The isolation block 2 has two symmetrically arranged blocking and receiving grooves 203 on the left side of its rear end face, each groove having a superior arc-shaped cross-section. The circuit breaker 1 has two symmetrically arranged blocking slots 101 on the left side of its main body adjacent to the terminals, each slot having a inferior arc-shaped cross-section. When the rear end face of the isolation block 2 is in contact with the circuit breaker 1, the blocking slots 101 and the blocking and receiving grooves 203 are aligned, forming a complete circular structure. The left end face of the isolation block 2 is positioned relative to the axis of the blocking and receiving grooves 203. A rotating hole 204 is provided in the part, and a rotating shaft 302 matching its structural dimensions is rotatably installed in the rotating hole 204. A cam blocking block 301 coaxially arranged with the rotating shaft 302 is fixedly installed on the right end face. The cam blocking block 301 is located inside the blocking and receiving groove 203. When the protruding end of the cam blocking block 301 faces the rear side, the protruding end of the cam blocking block 301 is located inside the blocking slot 101. A rotating block 3 with a hexagonal block structure is fixedly installed on the left end face of the rotating shaft 302. One side end face of the rotating block 3 facing the same direction as the protruding end of the cam blocking block 301 adopts an inclined surface structure.

[0018] The working principle of this embodiment: After the wire is connected to the terminal of circuit breaker 1, first tighten the fixing bolt inside the terminal to clamp the wire, and complete the initial fixing of the wire; Rotate the isolating block 2 so that its rear end face fits into the main body of the circuit breaker 1. At this time, the isolating block 2 completely covers the wiring terminal, achieving physical isolation and preventing non-staff members from directly contacting the terminal. At the same time, the reciprocating moving cavity 205 is precisely coaxial with the wiring terminal, providing a positioning basis for subsequent anti-loosening operations.

[0019] When the isolating block 2 is closed, the blocking slot 101 (minor arc circular structure) of the circuit breaker 1 and the blocking engagement receiving slot 203 (major arc circular structure) of the isolating block 2 form a complete circular cavity. At this time, rotating the hexagonal rotating block 3 drives the cam blocking block 301 to rotate synchronously through the rotating shaft 302 until the protruding end of the cam blocking block 301 rotates into the blocking slot 101. At this time, the cam blocking block 301 and the blocking slot 101 limit the rotation of the isolating block 2, firmly fixing it in the closed position, further enhancing the isolation and protection effect of the terminal block; because the rotating block 3 is connected to the cam blocking block 101, the rotation of the isolating block 2 is restricted, and it is firmly fixed ... 2. The side end face of the protruding end of block 301 is inclined. Therefore, when it is necessary to unlock, the staff who know this structure can quickly find the only inclined surface by touching the side end face of the rotating block 3, so as to know the current position of the protruding end of the cam blocking block 301, so as to rotate it to face the front side, thereby quickly disengaging the protruding end of the cam blocking block 301 from the blocking slot 101 to release the limit. Moreover, through the design of this structure, non-staff who do not know this structure cannot quickly release the limit, ensuring the protection of the terminal part by the isolation block 2. Insert a tool (matching the screw head 4 specification) into the insertion hole 201 and tighten the screw head 4. Since the screw head 4 is fixedly connected to the limiting round plate 402 and the anti-loosening stud 401, and the anti-loosening stud 401 is threadedly engaged with the threaded drive hole 202, when tightening, the anti-loosening stud 401 will move backward along the threaded drive hole 202. Continue to tighten until the rear end of the anti-loosening stud 401 tightly presses against the fixing bolt of the terminal. The tightening force of the anti-loosening stud 401 can counteract the loosening tendency of the fixing bolt caused by vibration and thermal expansion and contraction, thus achieving long-term anti-loosening.

Claims

1. A circuit breaker terminal anti-loosening structure, comprising a circuit breaker (1), characterized in that, An isolating block (2) is rotatably mounted on the right side of the circuit breaker (1) adjacent to the terminal block. The isolating block (2) has a reciprocating cavity (205) with a circular cavity structure inside. When the rear end face of the isolating block (2) is in contact with the circuit breaker (1), the isolating block (2) completely covers and blocks the terminal block area, and at this time, the reciprocating cavity (205) and the terminal block are coaxial. A threaded drive hole (202) penetrating the rear end face of the isolating block (2) is provided at the axial center of the rear side of the reciprocating cavity (205). A limiting circular plate (402) with the same diameter is slidably installed inside the cavity (205). The thickness of the limiting circular plate (402) is less than the width of the reciprocating cavity (205). A locking stud (401) is fixedly installed at the axial part of the rear end face of the limiting circular plate (402). The locking stud (401) is threadedly connected to the threaded drive hole (202). When the rear end of the locking stud (401) contacts the fixing bolt used to tighten the wire inside the terminal of the circuit breaker (1), the rear end face of the limiting circular plate (402) does not contact the rear side of the inner end of the reciprocating cavity (205).

2. The anti-loosening structure for circuit breaker terminals according to claim 1, characterized in that, The reciprocating moving cavity (205) has a through-hole (201) at the axial center of the front side of the inner end, which is a through-hole (2) at the front end of the isolation block (2). The through-hole (201) is a round hole, and the diameter of the through-hole (201) is smaller than the diameter of the reciprocating moving cavity (205). A screw head (4) is installed at the axial center of the front end of the limiting circular plate (402). The size of the screw head (4) is consistent with the size of the screw head of the fixing bolt used to tighten the wire inside the terminal of the circuit breaker (1). The diameter of the screw head (4) is consistent with the diameter of the through-hole (201).

3. The anti-loosening structure for circuit breaker terminals according to claim 2, characterized in that, The isolation block (2) has two symmetrically arranged blocking and receiving slots (203) on the left side of its rear end face. The blocking and receiving slots (203) have a superior arc circle structure in cross section. The circuit breaker (1) has two symmetrically arranged blocking slots (101) on the left side of its main body adjacent to the terminal block. The blocking slots (101) have a inferior arc circle structure in cross section. When the rear end face of the isolation block (2) is in contact with the main body of the circuit breaker (1), the blocking slots (101) and the blocking and receiving slots (203) are in corresponding positions. At this time, the blocking slots (101) and the blocking and receiving slots (203) together form a complete circular structure.

4. The anti-loosening structure for circuit breaker terminals according to claim 3, characterized in that, The left end face of the isolation block (2) is provided with a rotating hole (204) connected to the axis of the blocking and receiving groove (203). A rotating shaft (302) matching its structural dimensions is rotatably installed in the rotating hole (204). A cam blocking block (301) coaxially arranged with the rotating shaft (302) is fixedly installed on the right end face of the rotating shaft (302). The cam blocking block (301) is located inside the blocking and receiving groove (203). When the protruding end of the cam blocking block (301) faces the rear side, the protruding end of the cam blocking block (301) is located inside the blocking slot (101).

5. The anti-loosening structure for circuit breaker terminals according to claim 4, characterized in that, A hexagonal block (3) is fixedly installed on the left end face of the rotating shaft (302). The side end face of the rotating block (3) facing the same direction as the protruding end of the cam blocking block (301) adopts an inclined surface structure.

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