Self-locking connector

Abstract

The utility model discloses a self-locking connector which comprises a conductive connector main body, and the connector main body is provided with a wire clamp part used for connecting a cable and a locking connection part used for connecting a transformer terminal. The wire clamp part comprises a static chuck, a movable chuck arranged opposite to the static chuck, and a spring self-locking structure; the movable chuck comprises a pressing plate and a bolt rotationally connected with the top of the pressing plate. The end part of the bolt penetrates through a through hole formed in the connector main body, the pressing plate and the static chuck are driven to clamp the cable, and the spring self-locking structure self-locks and unlocks the bolt. According to the utility model, the action state of the bolt is controlled through the spring self-locking structure, thereby preventing the bolt at the wire clamping part of the connector from loosening, and further improving the cable clamping stability of the connector.

Description

Technical Field

[0001] This utility model relates to the technical field of power tools, and in particular to a self-locking connector. Background Technology

[0002] Transformer terminal connectors are used to connect transformer terminals and cables. Existing connectors often experience loosening of the bolted connections that hold bare cable conductors over time, especially in environments with high grease levels or high-frequency vibrations. This loosening can lead to unstable clamping of the bare cable conductors or even complete detachment, causing the connector to malfunction. Utility Model Content

[0003] This utility model provides a self-locking connector to prevent the self-locking connector wire clamp bolts from loosening.

[0004] The present invention adopts the following technical solution:

[0005] A self-locking connector includes a conductive connector body having a wire clamp portion and a locking connection portion;

[0006] The wire clamp includes a stationary clamp, a movable clamp disposed opposite to the stationary clamp, and a spring self-locking structure;

[0007] The moving chuck includes a pressure plate and a rotatably connected bolt to the top of the pressure plate; the end of the bolt passes through a through hole provided on the connector body, driving the pressure plate to clamp the cable with the stationary chuck, and the spring self-locking structure self-locks and unlocks the bolt.

[0008] In this solution, the bolt action state is controlled by a spring self-locking structure to prevent the connector cable clamp bolts from loosening, thereby improving the stability of the clamped cable.

[0009] As an improvement to the above solution, the spring self-locking structure includes a self-locking spring wound in the bolt thread, the self-locking spring being a helical torsion spring; the lower end of the self-locking spring is fixed to the connector body, and the upper end lever arm of the self-locking spring is connected to a movable block that provides variable space for the torsion of the upper lever arm of the self-locking spring, the movable block being located in a guide groove provided on the outer shell of the connector body; the inner diameter of the spring is smaller than the mean diameter of the bolt thread.

[0010] In this design, because the inner diameter of the spring is smaller than the pitch diameter of the bolt thread, screwing the self-locking spring into the bolt thread increases its inner diameter. Relying on the tightening force of the self-locking spring, a large frictional force is generated between the spring and the thread, achieving self-locking. Manually moving the movable block to twist the spring arm within the variable space unlocks the bolt. The self-locking spring deforms, and its inner diameter becomes larger than the pitch diameter of the bolt thread. At this point, rotating the bolt allows for easy rotation. This design uses a movable block for quick self-locking and unlocking of the bolt, making it more convenient and efficient. Since the lower end of the self-locking spring is fixed to the connector body, the self-locking spring locks the bolt, preventing relative rotation between the bolt and the connector body. This dual-locking mechanism, combining spring self-locking and connector body fixation, provides better anti-loosening protection.

[0011] The pitch diameter refers to the effective diameter between the outer diameter and the root diameter of the bolt's external thread. The variable space refers to the space within which the spring arm can rotate.

[0012] As an improvement to the above solution, a groove is provided on the connector body, and the lower end of the self-locking spring is wound around the corresponding groove on the connector body to form a self-locking spring fixing part. In this solution, the self-locking spring is fixed by extending and bending the lower end of the self-locking spring around the body, simplifying the components for fixing the self-locking spring and making the processing simple.

[0013] As an improvement to the above solution, a knurled pin is provided inside the groove, and the groove opening diameter is smaller than the diameter of the knurled pin. This solution utilizes the groove of the knurled pin to press against the wire diameter of the fixing part, thereby improving the stability of the fixing part in fixing the wire diameter.

[0014] As an improvement to the above solution, the through hole is divided into a threaded section and a through hole section, the bolt is threadedly connected to the threaded section, and the through hole section accommodates the bolt on which the self-locking spring is wound.

[0015] A groove leading to the end face of the connector body is provided at the connection between the through hole section and the threaded section, which facilitates the winding and fixing of the lower end of the self-locking spring.

[0016] In this design, the self-locking spring can be concealed within the through-hole section of the connector body, and the insulating outer shell surrounding the connector body can reduce its volume and cost; it also reduces the overall size of the cable clamp. The groove on the connector body facilitates the winding and fixing of the lower end of the self-locking spring.

[0017] As an improvement to the above solution, a blind groove is provided on the top surface of the pressure plate for inserting the end face of the bolt; a first groove or a first through hole is provided on both sides of the blind groove, the projection of the first groove or the first through hole is located on the blind groove, and it connects to the side end face of the pressure plate.

[0018] A second groove is provided around the bolt circumference away from the bolt head;

[0019] The diameter of the first groove is smaller than the diameter of the pin. The pin passes through the second groove of the first groove or first through hole and the screw on both sides of the blind groove, and rotates to connect the pressure plate and the bolt.

[0020] In this design, the distance between the pins located on both sides of the blind hole is greater than the diameter of the second groove on the screw but less than the outer diameter of the screw, thus clamping the second groove of the screw, and the bolt is rotatably connected to the pressure plate. Due to the blind groove, pins, and the second groove of the screw, the structure is simple, the processing technology is simple, and the cost is reduced.

[0021] Preferably, a guide rail is integrally formed on the connector body, and a slot adapted to the guide rail is provided on the moving block, the slot sliding along the guide rail.

[0022] In this design, the integrated guide rail of the clamp body is slidably connected to the slot of the moving block, which reduces the impact of the relative displacement between the outer shell and the clamp body on the torsion of the self-locking spring lever arm and improves the stability of the torsion of the self-locking spring lever arm.

[0023] As an improvement to the above solution, the locking connection part includes a first guide hole, a round hole, and a frustum hole connected coaxially in sequence. The diameter of the round hole is the same as the diameter of the upper bottom surface of the frustum hole, and the two form the inner wall of the cavity. The connection between the frustum hole and the round hole is the reduced diameter end of the frustum hole.

[0024] The inner wall of the frustum hole is fitted with a tapered block, and a first threaded hole and a second threaded tapered hole are set in sequence and coaxially connected. The connection between the first threaded hole and the second threaded tapered hole is the reduced diameter end of the tapered block.

[0025] A through groove or a longitudinal blind groove is provided on the peripheral wall of the tapered block. The through groove or the longitudinal blind groove divides the tapered block into several clamping pieces in the circumferential direction, providing a variable space for radial contraction clamping of the tapered block.

[0026] An external bolt is threadedly connected to the first threaded hole through the first guide hole, the round hole, and the first threaded hole.

[0027] In this design, the external bolt tightening provides a force that moves the tapered block toward the first guide hole. The wall of the frustum hole squeezes the outer wall of the tapered block and radially contracts toward the axis of the tapered block, so that the clamping piece of the second threaded hole clamps and locks the cylindrical terminal of the transformer, thereby connecting the cylindrical terminal of the transformer and the cable clamped by the wire clamp, and making a conductive connection.

[0028] As an improvement to the above solution, the axis of the wire passage cavity formed by the stationary and moving clamps of the wire clamp part has an angle with the axis of the internal threaded hole of the tapered block of the locking connection part.

[0029] In this design, the included angle determines the physical position between the cylindrical terminals of the transformer and the input / output cables held by the clamp, i.e., whether the input / output cables exit vertically, at an angle, or straight out. Specific included angle measurements can be designed according to the specific application environment or target user of the self-locking connector.

[0030] As an improvement to the above solution, the locking connection also includes a spring self-locking structure;

[0031] The spring self-locking structure includes a self-locking spring wound in the thread of the external bolt, the self-locking spring being a helical torsion spring; the lower end of the self-locking spring is fixed to the connector body, and the upper end lever arm of the self-locking spring is connected to a movable block that provides variable space for the torsion of the upper lever arm of the self-locking spring, the movable block being located in another guide groove provided on the outer shell of the connector body; the inner diameter of the spring is smaller than the mean diameter of the thread of the external bolt.

[0032] In this design, a self-locking spring is wound around the thread of the external bolt of the locking connection. Since the inner diameter of the spring is smaller than the pitch diameter of the bolt thread, screwing the self-locking spring into the bolt thread increases its inner diameter. Relying on the tightening force of the self-locking spring, a large frictional force is generated between the spring and the thread, achieving self-locking. Manually moving the movable block to twist the spring arm within the variable space unlocks the bolt. The self-locking spring deforms, and its inner diameter becomes larger than the pitch diameter of the bolt thread. At this point, rotating the bolt allows for easy rotation. This design uses a movable block for quick self-locking and unlocking of the bolt, making it more convenient and efficient. Because the lower end of the self-locking spring is fixed to the connector body, the self-locking spring locks the bolt, preventing relative rotation between the bolt and the connector body. This dual-locking mechanism, combining spring self-locking and connector body fixation, provides better anti-loosening protection. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a self-locking connector provided in an embodiment of this utility model;

[0034] Figure 2 This is a partial structural diagram of the wire clamp portion of the bolt axis in a left-view section of a self-locking connector provided in this embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of the connection relationship between the spring self-locking structure and the bolt of a self-locking connector provided in this embodiment of the utility model;

[0036] Figure 4 This is a schematic diagram of the spring self-locking structure provided by this utility model;

[0037] Figure 5 This is a schematic diagram of the connection relationship between the insulating shell and the moving block of a self-locking connector provided in this embodiment of the utility model;

[0038] Figure 6 This is a schematic diagram of the knurled pin provided by this utility model;

[0039] Figure 7 This is a schematic diagram of the pressure plate structure of the wire clamp provided by this utility model;

[0040] Figure 8 This is an exploded structural diagram of the locking connection portion of a self-locking connector provided in an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the structure of the tapered block provided in this embodiment of the utility model;

[0042] Figure 10 This is a cross-sectional structural diagram of the bolt axis of the clamping part and the bolt axis of the locking connection part of a self-locking connector provided in this embodiment of the utility model;

[0043] Figure 11 This is a cross-sectional structural diagram of the axis of the clamping bolt and the axis of the locking connection bolt of a self-locking connector provided in another embodiment of the present invention. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] See Figure 1This utility model provides a schematic diagram of the structure of a self-locking connector. The self-locking connector includes a conductive connector body 1, which has a clamp portion 2 for connecting a cable and a locking connection portion 3 for connecting a transformer terminal. Optionally, the locking connection portion can be connected to other cable conductors or terminals.

[0048] The cable clamp includes a stationary clamp 230, a movable clamp opposite to the stationary clamp, and a spring self-locking structure 100. The movable clamp includes a pressure plate 241 and a bolt 210 rotatably connected to the top of the pressure plate. A through hole is provided on the connector body, which is divided into a threaded section 211 and a through hole section 212. The bolt passes through the through hole and is threadedly connected to the threaded section. The bolt moves up and down with the rotation of the thread, causing the pressure plate to clamp or disassemble the cable conductor. The cable conductor here is a bare wire.

[0049] The spring self-locking mechanism includes a self-locking spring 120 wound in the bolt thread. The self-locking spring is a helical torsion spring. The lower end of the self-locking spring is fixed to the connector body, and the upper end lever arm 121 of the self-locking spring is connected to a movable block 130 that provides variable space for the upper part of the self-locking spring to twist. The movable block is located in a guide groove 221 provided on the insulating shell 10 of the connector body. The movable block is an insulator structure.

[0050] A guide rail 214 is integrally formed on the connector body. A slot 131 adapted to the guide rail is provided on the moving block 130. The slot 131 slides along the guide rail 214, changing the unlocking or locking state of the moving block. A protrusion 132 for connecting the lever arm of the self-locking spring is provided above the slot. An insulating shell 10 is provided outside the connector body. A guide groove 221 is provided on the insulating shell. The insulating moving block 130 passes through the guide groove 221. The guide groove limits the self-locking end 222 of the moving block and provides variable space for the upper part of the self-locking spring to twist and unlock. The other end of the guide groove 221 is the unlocking end 223.

[0051] The inner diameter of the self-locking spring is smaller than the mean diameter of the matching thread. When the self-locking spring is screwed into the thread of the matching screw, the inner diameter of the self-locking spring becomes larger. Relying on the tightening force of the self-locking spring, the self-locking spring and the thread generate a large frictional force, thus achieving the purpose of self-locking.

[0052] In this embodiment, the self-locking spring rotates counterclockwise when viewed from above. Under normal conditions, the moving block is located at the self-locking end on the right side of the guide groove, which is used to limit the self-locking spring from continuing to rotate toward the self-locking end of the guide groove. The self-locking end of the guide groove further limits the lever arm of the self-locking spring through the moving block, making the self-locking more secure and stable.

[0053] When the moving block is manually moved toward the unlocking end, the self-locking spring lever arm is torn by the external force of the moving block due to the variable space in the guide groove. The self-locking spring deforms, and the inner diameter of the self-locking spring is larger than the mean diameter of the bolt thread. At this time, the bolt can be easily rotated by turning it.

[0054] The through-hole section 212 accommodates a bolt on which the self-locking spring is wound. The threaded section 211 is threadedly connected to the bolt 210, allowing the pressure plate connected to the bolt end to move up and down to clamp or remove the cable body from the stationary chuck. A groove 213 leading to the end face of the connector body is provided at the connection between the through-hole section and the threaded section, facilitating the winding and fixing of the lower end of the self-locking spring to form a fixing part 124 for securing the locking spring. The plane enclosed by the fixing part of the self-locking spring forms an angle with the bottom surface of the self-locking spring, which is either acute or obtuse, reducing the wobbling of the fixing part within the groove.

[0055] Because the spring wire diameter is relatively thin, a knurled pin 140 is placed in the groove 213. The groove of the knurled pin presses against the wire diameter of the fixing part. Even if the wire diameter of the fixing part shakes, it will roll through the groove 1411 of the knurled pin, and the next knurled pin groove will continue to press against the wire diameter of the fixing part, thereby improving the stability of the fixing part wire diameter.

[0056] A blind groove 2411 is provided on the top surface of the pressure plate, into which the end face of the bolt 210 is inserted. A second groove is provided on the bolt shank away from the bolt head, preferably a circumferential arc-shaped groove 2101 smaller than the inner diameter of the bolt thread. Two first grooves 2412 or first through holes are provided on both sides of the blind groove of the pressure plate. The projections of the two grooves or first through holes are located on the blind groove and connect to the side end face of the pressure plate. The groove opening diameter is smaller than the diameter of the knurled pin. When the knurled pin 141 is inserted from the two first grooves 2412 or first through holes on the side end face of the pressure plate, it also passes through the circumferential arc-shaped groove 2101 of the bolt, thereby rotating and connecting the bolt and the pressure plate. Tightening the bolt upwards or downwards causes the pressure plate to disassemble or clamp the cable body.

[0057] The locking connection part 3 includes a first guide hole 311, a cylindrical hole 312 with a diameter larger than the first guide hole, and a frustum hole 313, all three being coaxially connected in sequence. The diameter of the cylindrical hole is the same as the diameter of the upper bottom surface of the frustum hole, and the inner wall of the cavity formed by the two is smooth. The connection between the frustum hole and the cylindrical hole is the reduced diameter end of the frustum hole.

[0058] The inner wall of the frustum hole is adapted to accommodate the tapered block 320, which has a first threaded hole 321 and a second threaded tapered hole 322 along its axis. The two are connected coaxially in sequence, and the connection between the first threaded hole and the second threaded tapered hole is the tapered end of the tapered block.

[0059] The tapered block has a through groove 324 and / or a longitudinal blind groove 323 on its peripheral wall. The through groove or the longitudinal blind groove divides the tapered block into several clamping pieces in the circumferential direction, providing a variable space for radial contraction clamping of the tapered block.

[0060] The cylindrical terminal 300 of the transformer is inserted into the second threaded tapered hole. An external bolt 310 passes through the first guide hole 311 and is connected to the thread 321 of the first threaded hole of the tapered block. Tightening the external bolt provides a force for the tapered block to move toward the first guide hole. The wall of the frustum hole squeezes the outer wall of the tapered block and radially contracts toward the axis of the tapered block, so that the second threaded tapered hole 322 clamps and locks the cylindrical terminal of the transformer.

[0061] In another embodiment, the locking connection further includes a spring self-locking mechanism. A self-locking spring is wound around the threads of the external bolt. The upper end of the self-locking spring is connected to a moving block, and the lower end is fixedly wound in another groove provided on the connector body. The moving block is limited by a first guide groove provided on the outer insulating shell 10 of the connector body. The first guide groove can provide variable space for unlocking. A first guide hole accommodates the external bolt wound with the self-locking spring.

[0062] The inner wall of the second threaded hole is tapered, providing gradually enhanced radial pressure to the cylindrical terminals of the transformer and providing a more stable clamping force.

[0063] In the first embodiment of the tapered block, three longitudinal blind grooves 323 and one vertical through groove 324 are provided circumferentially, and the internal threaded hole of the tapered block is radially connected to the outside through the longitudinal blind grooves and the vertical through groove.

[0064] In a second embodiment of the tapered block, a longitudinal blind groove 323 and a vertical through groove 324 are provided circumferentially on the tapered block, which radially connect the internal threaded hole of the tapered block to the outside through the longitudinal blind groove and the vertical through groove. A radial blind groove is provided between the bottom of the blind groove and the top surface of the tapered block.

[0065] In a third embodiment of the tapered block, a vertical through groove 324 is provided around the tapered block, which radially connects the internal threaded hole of the tapered block to the outside.

[0066] The axis M of the through-cavity formed by the stationary and moving clamps of the wire clamp is at an angle θ with the axis N of the internal threaded hole of the tapered block of the locking connection. When the angle is 0 degrees, the axis of the cylindrical terminal of the transformer held by the tapered block is parallel to the axis of the cable connected to the wire clamp, that is, the cylindrical terminal of the transformer and its input and output lines are straight.

[0067] When the included angle is a right angle, the axis of the cylindrical terminal of the transformer held by the tapered block is perpendicular to the axis of the cable connected to the clamp, that is, the cylindrical terminal of the transformer is perpendicular to its input and output lines.

[0068] When the included angle θ is acute or obtuse, it makes the angle between the cylindrical terminal of the transformer held by the tapered block and the axis of the cable connected to the clamp part acute or obtuse, that is, the cylindrical terminal of the transformer and its input and output lines are oblique. This included angle θ can be set according to different transformer usage environments, different objects connected to the self-locking connector, and different usage environments of the objects connected to the self-locking connector; thus providing more application scenarios for self-locking connector wiring.

[0069] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A self-locking connector, comprising a conductive connector body, characterized in that, The connector body has a wire clamp portion and a locking connection portion; The wire clamp includes a stationary clamp, a movable clamp disposed opposite to the stationary clamp, and a spring self-locking structure; The moving chuck includes a pressure plate and a rotatably connected bolt to the top of the pressure plate; the end of the bolt passes through a through hole provided on the connector body, driving the pressure plate to clamp the cable with the stationary chuck, and the spring self-locking structure self-locks and unlocks the bolt.

2. The self-locking connector as described in claim 1, characterized in that, The spring self-locking structure includes a self-locking spring wound in the bolt thread, the self-locking spring being a helical torsion spring; the lower end of the self-locking spring is fixed to the connector body, and the upper end lever arm of the self-locking spring is connected to a movable block that provides variable space for the torsion of the upper lever arm of the self-locking spring, the movable block being located in a guide groove provided on the outer shell of the connector body; the inner diameter of the spring is smaller than the mean diameter of the bolt thread.

3. The self-locking connector as described in claim 2, characterized in that, The connector body is provided with a groove, and the lower end of the self-locking spring is wrapped around to form a self-locking spring fixing part in the corresponding groove of the connector body.

4. The self-locking connector as described in claim 3, characterized in that, A knurled pin is installed in the groove, and the diameter of the groove opening is smaller than the diameter of the knurled pin.

5. The self-locking connector as described in claim 2, characterized in that, The through hole is divided into a threaded section and a through hole section. The bolt is threadedly connected to the threaded section, and the through hole section accommodates the bolt on which the self-locking spring is wound. A groove leading to the end face of the connector body is provided at the connection between the through hole section and the threaded section, which facilitates the winding and fixing of the lower end of the self-locking spring.

6. The self-locking connector as described in claim 1, characterized in that, A blind groove is provided on the top surface of the pressure plate for inserting the end face of the bolt; a first groove or a first through hole is provided on both sides of the blind groove, the projection of the first groove or the first through hole is located on the blind groove and connects to the side end face of the pressure plate; A second groove is provided around the bolt circumference away from the bolt head; The diameter of the first groove is smaller than the diameter of the pin. The pin passes through the second groove of the first groove or first through hole and the screw on both sides of the blind groove, and rotates to connect the pressure plate and the bolt.

7. The self-locking connector as described in claim 2, characterized in that, The connector body is integrally provided with a guide rail, and the moving block is provided with a slot that matches the guide rail, and the slot slides along the guide rail.

8. The self-locking connector as described in claim 1, characterized in that, The locking connection includes a first guide hole, a round hole, and a frustum hole connected coaxially in sequence. The diameter of the round hole is the same as the diameter of the upper bottom surface of the frustum hole, and the two form the inner wall of the cavity. The connection between the frustum hole and the round hole is the reduced diameter end of the frustum hole. The inner wall of the frustum hole is fitted with a tapered block, and a first threaded hole and a second threaded tapered hole are provided in sequence and coaxially connected. The connection between the first threaded hole and the second threaded tapered hole is the reduced diameter end of the tapered block. A through groove or a longitudinal blind groove is provided on the peripheral wall of the tapered block. The through groove or the longitudinal blind groove divides the tapered block into several clamping pieces in the circumferential direction, providing a variable space for radial contraction clamping of the tapered block. An external bolt is threadedly connected to the first threaded hole through the first guide hole, the round hole, and the first threaded hole.

9. The self-locking connector as described in claim 8, characterized in that, The axis of the wire passage cavity formed by the stationary and moving clamps of the wire clamp has an angle with the axis of the threaded hole inside the tapered block of the locking connection.

10. The self-locking connector as described in claim 8, characterized in that, The locking connection also includes a spring self-locking structure; The spring self-locking structure includes a self-locking spring wound in the thread of the external bolt, the self-locking spring being a helical torsion spring; the lower end of the self-locking spring is fixed to the connector body, and the upper end lever arm of the self-locking spring is connected to a movable block that provides variable space for the torsion of the upper lever arm of the self-locking spring, the movable block being located in another guide groove provided on the outer shell of the connector body; the inner diameter of the spring is smaller than the mean diameter of the thread of the external bolt.

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