A copper-aluminum terminal with self-locking anti-loose buckle
With its self-locking anti-loosening buckle design, the copper-aluminum terminals maintain the tightness between the wire and the inner hole under factors such as thermal expansion and contraction and vibration, solving the problem of connection loosening caused by the decay of bolt preload in the existing technology and achieving a stable connection effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI NUODIAN ELECTRIC POWER TECHNOLOGY CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-06-02
AI Technical Summary
Existing copper-aluminum terminals experience a decrease in bolt preload due to thermal expansion and contraction during power-on and power-off processes, leading to loosening and failure of the connection.
The copper-aluminum terminal is designed with a self-locking anti-loosening buckle. Through the cooperation of the self-locking mechanism and the ring, a rigid and elastic locking structure is formed to counteract the loosening tendency caused by factors such as thermal expansion and contraction, and to ensure a tight fit between the wire and the inner hole.
It achieves a tight connection between the wire and the inner hole under the influence of factors such as thermal expansion and contraction and vibration, avoiding connection failure and providing a dual effect of "tightening + preventing loosening".
Smart Images
Figure CN224318715U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of terminal block technology, specifically a copper-aluminum terminal block with a self-locking anti-loosening buckle. Background Technology
[0002] Copper-aluminum terminals are used for copper-aluminum transitions between aluminum alloy cables and copper connection structures in equipment. This prevents direct contact between the copper connection structure and the aluminum alloy cable, which could lead to corrosion and serious accidents. For example, copper-aluminum terminals used in reactors typically consist of both aluminum and copper conductors. The aluminum conductor is usually cylindrical with an internal hole to accommodate the conductor core.
[0003] For example, the national authorized patent announcement number CN213753113U discloses a copper-aluminum terminal. This copper-aluminum terminal includes an aluminum conductor, one end of which is connected to a copper conductor, and the other end has an inner hole. The sidewall of the inner hole includes two concave arc surfaces and two flat surfaces. The two arc surfaces are arranged opposite each other; the two flat surfaces are respectively connected to the same end of the two arc surfaces, and the two flat surfaces are parallel. This copper-aluminum terminal can improve the tightness of the connection between itself and the inner core of the conductor.
[0004] However, the copper-aluminum terminals mentioned above, which are crimped to the wires with bolts, cannot automatically apply a locking effect. They are only fixed by the preload of the bolts. During the power-on and power-off process, the copper-aluminum terminals will generate heat due to the current. Changes in ambient temperature will also cause thermal expansion and contraction of components such as terminals, wires, and bolts. This periodic volume change will repeatedly weaken the preload of the bolts, reduce the fit between the wires and the inner hole, and cause the connection failure due to loosening of the bolts or nuts. Utility Model Content
[0005] The purpose of this utility model is to provide a copper-aluminum terminal with a self-locking anti-loosening buckle to solve the problem mentioned in the background art that relies solely on bolt preload to fix the wire. Under the periodic action of heat generated by power-on and power-off and changes in ambient temperature causing thermal expansion and contraction of various components, the bolt preload is repeatedly weakened, which in turn causes a decrease in the fit between the wire and the inner hole, loosening of the bolt or nut, and ultimately leads to connection failure.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A copper-aluminum terminal with a self-locking anti-loosening buckle includes: a copper-aluminum terminal body, a ring fixedly installed on the upper surface of the wiring lug of the copper-aluminum terminal body, an embedded groove opened on the upper surface of the wiring lug of the copper-aluminum terminal body, the embedded groove being located at the inner ring of the ring, and a self-locking mechanism fixedly installed in the embedded groove.
[0008] Preferably, the self-locking end of the self-locking mechanism is located inside the ring and simultaneously abuts against the inner ring wall of the ring.
[0009] Preferably, both the ring and the self-locking mechanism are connected to the threaded hole on the terminal lug. This allows the bolt to pass through the ring, the self-locking mechanism, and the terminal lug in sequence to fix it. The hexagonal head of the bolt can press the self-locking mechanism into the inner groove. Under continuous pressure, the self-locking mechanism pressed into the inner groove will contact the inner ring wall of the ring, thus bending and deforming. Finally, the bent self-locking mechanism will naturally fill the gap between the inner ring wall of the ring and the hexagonal head of the bolt, forming a tight fit.
[0010] Preferably, the self-locking mechanism includes a curved spring, which is fixedly installed in the inner groove. A washer is fixedly installed on the upper surface of the curved spring, and the washer is slidably installed in the inner groove with damping. Multiple sets of bent plates are fixedly installed in an inclined ring shape on the upper surface of the washer, and the other end of the multiple sets of bent plates abuts against the inner ring wall of the ring.
[0011] Preferably, a filling plate is fixedly installed at one end of the bent plate.
[0012] Preferably, anti-slip teeth are fixedly installed at the other end of the bending plate.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. Through the design of the copper-aluminum terminal body, ring, inner groove, and self-locking mechanism, when it is necessary to fix the wire, first insert the inner core of the wire into the corresponding inner hole of the aluminum conductor of the copper-aluminum terminal body, ensuring that the wire and the arc surface and plane of the inner hole are tightly fitted. Then, pass the bolt through the through holes of the ring and the self-locking mechanism in sequence, and start tightening it by aligning it with the threaded hole on the terminal lug. As the bolt is gradually tightened, its hexagonal head will apply downward pressure, pushing the self-locking mechanism, which was originally partially protruding from the inner groove, into the groove. Since the self-locking end of the self-locking mechanism is initially in contact with the inner ring wall of the ring, when it is pressed into the inner groove by the hexagonal head of the bolt, the inner ring wall of the ring will generate lateral resistance to the self-locking mechanism, forcing the self-locking mechanism to engage. When bent and deformed, the self-locking mechanism, as the hexagonal head of the bolt continues to rotate downwards, tightly fills the gap between the inner wall of the ring and the hexagonal head of the bolt, forming a rigid locking structure of "hexagonal head - self-locking mechanism - ring". On the one hand, the preload of the bolt through the threaded connection firmly presses the inner core of the conductor into the inner hole of the aluminum conductor, ensuring the tightness of the initial conductive contact. On the other hand, the self-locking mechanism after bending, through mechanical locking, counteracts the loosening tendency of the bolt caused by thermal expansion and contraction, vibration and other factors. Even if the bolt preload decreases, the locking relationship between the self-locking mechanism, the ring and the hexagonal head can still maintain the clamping force on the conductor, thereby achieving the dual effect of "tightening + anti-loosening" and avoiding connection failure.
[0015] 2. Through the design of the curved spring, washer, bending plate, filling plate, and anti-slip teeth, when fixing the wire, the bolt is passed through the through holes of the ring and the middle washer in sequence, and tightened by aligning it with the threaded hole on the terminal lug. As the bolt is gradually tightened, its hexagonal head applies downward pressure to the bending plate and washer. Under the pressure, the bending plate pushes the washer into the inner groove, compressing the curved spring and deforming it in the inner groove. At the same time, as the washer moves downward, it also pulls multiple sets of bending plates, which are distributed in an inclined ring on the upper surface, into the ring. Subsequently, as the bolt tightens, the hexagonal head pushes the washer, compressing the curved spring into a smooth shape. The deformation reaches the design threshold, maximizing the storage of elastic potential energy. This potential energy is converted into a continuous upward thrust on the washer, which is transmitted through the washer to the bending plate and the hexagonal head of the bolt, equivalent to... The entire connection structure is provided with an "elastic buffer pad". When the preload of the bolt decreases due to thermal expansion and contraction, vibration, etc., the elastic potential energy released by the curve spring will compensate immediately, pushing the washer and the bending plate to maintain pressure on the hexagonal head, ensuring that the rigid engagement of "hexagonal head - bending plate - ring" does not loosen, fundamentally avoiding the loss of wire fixing force. During the process of the bolt compressing the curve spring into a smooth shape through the hexagonal head, it will also squeeze the inclined bending plate section into a smooth shape through the hexagonal head and make it contact the surface of the washer. The remaining section will drive the filling plate to contact the inner ring wall of the ring and be bent by the downward pressure of the hexagonal head to fully fill the gap between the hexagonal head and the inner ring wall of the ring, forming a rigid engagement structure of "hexagonal head - bending plate - ring", thereby achieving the dual effect of "tightening + anti-loosening" and avoiding connection failure. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the overall side cross-section of this utility model;
[0018] Figure 3 This is a schematic diagram of the self-locking mechanism of this utility model.
[0019] In the diagram: 1. Copper-aluminum terminal body; 101. Ring; 102. Embedded groove; 2. Self-locking mechanism; 201. Curved spring; 202. Washer; 203. Bending plate; 204. Filling plate; 205. Anti-slip teeth. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figures 1-3 This embodiment provides the following technical solution:
[0022] like Figure 1-Figure 1 As shown, a copper-aluminum terminal with a self-locking anti-loosening buckle includes: a copper-aluminum terminal body 1, a ring 101 fixedly installed on the upper surface of the wiring lug of the copper-aluminum terminal body 1, an inner groove 102 is opened on the upper surface of the wiring lug of the copper-aluminum terminal body 1, and the inner groove 102 is located in the inner ring of the ring 101, and a self-locking mechanism 2 is fixedly installed in the inner groove 102.
[0023] The self-locking end of the self-locking mechanism 2 is located inside the ring 101 and simultaneously abuts against the inner ring wall of the ring 101.
[0024] Both the ring 101 and the self-locking mechanism 2 are connected to the threaded hole on the terminal lug. This allows the bolt to pass through the ring 101, the self-locking mechanism 2 and the terminal lug in sequence to fix it. The hexagonal head of the bolt can press the self-locking mechanism 2 into the inner groove 102. Under continuous pressure, the self-locking mechanism 2 pressed into the inner groove 102 will contact the inner ring wall of the ring 101 and bend. Finally, the bent self-locking mechanism 2 will naturally fill the gap between the inner ring wall of the ring 101 and the hexagonal head of the bolt, forming a tight fit.
[0025] Through the design of the copper-aluminum terminal body 1, ring 101, inner groove 102, and self-locking mechanism 2, when it is necessary to fix the wire, first insert the inner core of the wire into the corresponding inner hole of the aluminum conductor of the copper-aluminum terminal body 1, ensuring that the wire and the arc surface and plane of the inner hole are tightly fitted. Then, the bolt is passed through the through holes of the ring 101 and the self-locking mechanism 2 in sequence, and the threaded hole on the terminal lug is aligned to begin tightening. As the bolt is gradually tightened, its hexagonal head will apply downward pressure, pushing the self-locking mechanism 2, which was originally partially protruding from the inner groove 102, to move into the groove. Since the self-locking end of the self-locking mechanism 2 is initially in contact with the inner ring wall of the ring 101, when it is pressed into the inner groove 102 by the hexagonal head of the bolt, the inner ring wall of the ring 101 will generate lateral resistance to the self-locking mechanism 2, forcing it to... When the self-locking mechanism 2 is bent and deformed, the bent self-locking mechanism 2 will tightly fill the gap between the inner ring wall of the ring 101 and the hexagonal head of the bolt as the hexagonal head of the bolt continues to rotate downward, forming a rigid locking structure of "hexagonal head - self-locking mechanism 2 - ring 101". On the one hand, the bolt firmly presses the inner core of the wire into the inner hole of the aluminum conductor through the pre-tightening force of the threaded connection, ensuring the tightness of the initial conductive contact. On the other hand, the bent self-locking mechanism 2, through mechanical locking, counteracts the loosening tendency of the bolt caused by thermal expansion and contraction, vibration and other factors. Even if the bolt pre-tightening force decreases, the locking relationship between the self-locking mechanism 2, the ring 101 and the hexagonal head can still maintain the clamping force on the wire, thereby achieving the dual effect of "tightening + anti-loosening" and avoiding connection failure.
[0026] like Figure 3 As shown, the self-locking mechanism 2 includes a curved spring 201, which is fixedly installed in the inner groove 102. A washer 202 is fixedly installed on the upper surface of the curved spring 201, and the washer 202 is damped and slidably installed in the inner groove 102. Multiple sets of bent plates 203 are fixedly installed in an inclined ring shape on the upper surface of the washer 202, and the other end of the multiple sets of bent plates 203 abuts against the inner ring wall of the ring 101. A filling plate 204 is fixedly installed on one end of the bent plate 203, and an anti-slip tooth 205 is fixedly installed on the other end of the bent plate 203.
[0027] Through the design of the curved spring 201, washer 202, bending plate 203, filling plate 204, and anti-slip teeth 205, when fixing the wire, the bolt can be passed through the through holes of the ring 101 and the middle washer 202 in sequence, and tightened by aligning it with the threaded hole on the terminal lug. As the bolt is gradually tightened, its hexagonal head will apply downward pressure to the bending plate 203 and washer 202. Under the pressure, the bending plate 203 will push the washer 202 to slide into the inner groove 102, while compressing the curved spring. The washer 201 deforms within the recessed groove 102. Simultaneously, as the washer 202 moves downwards, it pulls multiple sets of bent plates 203, arranged in an inclined ring on its upper surface, into the ring 101. Subsequently, as the bolts tighten, the hexagonal head pushes the washer 202, compressing the curved spring 201 into a smooth shape. The deformation reaches the design threshold, maximizing the storage of elastic potential energy. This potential energy is converted into a continuous upward thrust on the washer 202, which is then transmitted to the bent plates through the washer 202. The hexagonal head of the bolt (203) acts as an "elastic buffer" for the entire connection structure. When the preload of the bolt decreases due to thermal expansion and contraction, vibration, etc., the elastic potential energy released by the curved spring (201) will compensate immediately, pushing the washer (202) and the bending plate (203) to maintain pressure on the hexagonal head. This ensures that the rigid engagement of "hexagonal head - bending plate (203) - ring (101)" does not loosen, fundamentally preventing the loss of wire fixing force. Furthermore, during the process of the bolt compressing the curved spring (201) into a smooth shape through the hexagonal head... Together, the hexagonal head will press a section of the inclined bending plate 203 into a smooth shape and place it against the surface of the washer 202. The remaining section will then move the filling plate 204 to touch the inner ring wall of the ring 101 and be bent by the downward pressure of the hexagonal head to fully fill the gap between the hexagonal head and the inner ring wall of the ring 101, forming a rigid interlocking structure of "hexagonal head - bending plate 203 - ring 101", thereby achieving the dual effect of "fastening + anti-loosening" and avoiding connection failure.
[0028] Based on the above technical solution, the working steps of this solution are summarized as follows: When it is necessary to fix the wire, first insert the inner core of the wire into the corresponding inner hole of the aluminum conductor of the copper-aluminum terminal body 1, ensuring that the wire is tightly fitted with the arc surface and plane of the inner hole. Then, pass the bolt through the through holes of the ring 101 and the washer 202 in sequence, and start tightening it by aligning it with the threaded hole on the terminal lug. As the bolt is gradually tightened, its hexagonal head will apply downward pressure, pushing the bent plate 203, which originally protruded from the inner groove 102, through the washer 202. 2. The washer 202 slides into the inner groove 102 and the ring 101. During the sliding process of the washer 202 into the inner groove 102, it will compress the curve spring 201 and deform in the inner groove 102. Then, as the bolt is tightened, the hexagonal head will push the washer 202 to compress the curved curve spring 201 into a smooth shape. Its deformation reaches the design threshold, which can store elastic potential energy to the maximum extent. This potential energy will be converted into a continuous upward pushing force on the washer 202, which is transmitted to the bending point through the washer 202. Plate 203 and the hexagonal head of the bolt act as an "elastic buffer" for the entire connection structure. When the preload of the bolt decreases due to thermal expansion and contraction, vibration, etc., the elastic potential energy released by the curved spring 201 will compensate immediately, pushing the washer 202 and the bent plate 203 to maintain pressure on the hexagonal head, ensuring that the rigid engagement of "hexagonal head - bent plate 203 - ring 101" does not loosen, fundamentally preventing the loss of wire fixing force. During the process of the bolt compressing the curved spring 201 into a smooth shape through the hexagonal head, Together, the hexagonal head will press a section of the inclined bending plate 203 into a smooth shape and make it contact the surface of the washer 202. The remaining section will move the filling plate 204 to contact the inner ring wall of the ring 101 and be bent by the downward pressure of the hexagonal head to fully fill the gap between the hexagonal head and the inner ring wall of the ring 101, forming a rigid interlocking structure of "hexagonal head - bending plate 203 - ring 101", which achieves the dual effect of "fastening + anti-loosening" and avoids connection failure.
[0029] In summary: the rigid engagement of the "hexagonal head - bending plate 203 - ring 101" prevents the loss of wire fixing force and counteracts the loosening tendency of the bolts caused by thermal expansion and contraction, vibration and other factors, thus avoiding connection failure.
[0030] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A copper-aluminum terminal with a self-locking anti-loosening buckle, characterized in that, include: A copper-aluminum terminal body (1) has a ring (101) fixedly installed on the upper surface of the wiring lug of the copper-aluminum terminal body (1). An embedded groove (102) is opened on the upper surface of the wiring lug of the copper-aluminum terminal body (1). The embedded groove (102) is located in the inner ring of the ring (101), and a self-locking mechanism (2) is fixedly installed in the embedded groove (102).
2. A copper-aluminum terminal with a self-locking anti-loosening buckle according to claim 1, characterized in that: The self-locking end of the self-locking mechanism (2) is located inside the ring (101) and simultaneously abuts against the inner ring wall of the ring (101).
3. A copper-aluminum terminal with a self-locking anti-loosening buckle according to claim 2, characterized in that: The ring (101) and the self-locking mechanism (2) are connected to the threaded hole on the terminal lug, so that when the bolt passes through the ring (101), the self-locking mechanism (2) and the terminal lug in sequence to fix it, the hexagonal head of the bolt can press the self-locking mechanism (2) into the inner groove (102). Under continuous pressure, the self-locking mechanism (2) pressed into the inner groove (102) will contact the inner ring wall of the ring (101) and bend. Finally, the bent self-locking mechanism (2) will naturally fill the gap between the inner ring wall of the ring (101) and the hexagonal head of the bolt, forming a tight fit.
4. A copper-aluminum terminal with a self-locking anti-loosening buckle according to claim 1, characterized in that: The self-locking mechanism (2) includes a curved spring (201), which is fixedly installed in the inner groove (102). A washer (202) is fixedly installed on the upper surface of the curved spring (201), and the washer (202) is damped and slidably installed in the inner groove (102). Multiple sets of bent plates (203) are fixedly installed in an inclined ring on the upper surface of the washer (202), and the other end of the multiple sets of bent plates (203) touches the inner ring wall of the ring (101).
5. A copper-aluminum terminal with a self-locking anti-loosening buckle according to claim 4, characterized in that: A filling plate (204) is fixedly installed at one end of the bending plate (203).
6. A copper-aluminum terminal with a self-locking anti-loosening buckle according to claim 5, characterized in that: The other end of the bending plate (203) is fixedly equipped with anti-slip teeth (205).