Spring self-locking structure and wire clamp

Abstract

The invention discloses a spring self-locking structure and a wire clamp, the spring self-locking structure comprises a bolt and a self-locking spring wound in a bolt thread, and the self-locking spring is a spiral torsion spring; the lower end of the self-locking spring is fixed on a main body matched and connected with the bolt, a force arm at the upper end of the self-locking spring is connected with a moving block capable of providing a variable space for torsion of the upper part of the self-locking spring, and the moving block is positioned in a guide groove formed in a main body shell; the inner diameter of the spring is smaller than the pitch diameter of the bolt thread. On the other hand, the invention provides a wire clamp with a spring self-locking structure, and the wire clamp comprises a conductive wire clamp main body, an insulating shell arranged outside the wire clamp main body, and the spring self-locking structure. At least one pair of static chuck and movable chuck is arranged on the wire clamp main body, and the movable chuck comprises a pressing plate and a bolt rotationally connected with the pressing plate. According to the invention, loosening of the bolt and loosening of the cable clamp bolt for clamping the cable are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to a spring self-locking structure and a wire clamp. Background Art

[0002] Cable clamps are iron or aluminum metal accessories that can be fixed on wires. Most of them need to withstand large tensile forces during operation, and some also need to ensure good electrical contact. Cable clamps are devices used to fix and support cables, which can minimize the risk of electrical failures and ensure the stability and safety of cables under various environmental conditions.

[0003] In the prior art, an anti-skid pressure plate is provided on the movable clamp of the cable clamp, and anti-reverse helical teeth are provided on the anti-skid pressure plate. An anti-reverse helical gear ring is provided on the end face of the bolt and a corresponding anti-reverse helical gear ring is provided on the anti-skid pressure plate. A reverse helical gear ring is further provided on the wire pressing part of the anti-skid pressure plate. The anti-reverse helical gear ring provided on the end face of the bolt and the reverse helical gear ring on the wire pressing part of the anti-skid pressure plate are oriented in the same direction, so as to restrict the bolt from rotating in the opposite direction relative to the anti-skid pressure plate, thereby ensuring that the bolt will not loosen even if the bolt connection time is long and in an environment with a lot of grease and high-frequency vibration. In this solution, the bolt, anti-skid pressure plate and wire body will not loosen, but there may be a slight loosening between the three as a whole and the main body of the wire clamp. In addition, the end face of the bolt needs to be processed with a reverse helical gear ring, and the connection surface of the anti-skid plate and the bolt and the wire pressing part need to be processed with a reverse helical gear ring and they need to be connected to each other, which is complicated. Summary of the invention

[0004] The present invention provides a spring self-locking structure and a wire clamp, which can prevent a bolt from loosening and the bolt of the wire clamp from loosening, and self-locking and unlocking are more convenient.

[0005] In the first aspect, the present invention provides a spring self-locking structure, which includes a bolt and a self-locking spring wound in the bolt thread, the self-locking spring is a helical torsion spring; the lower end of the self-locking spring is fixed on a main body matched with the bolt, and the upper end force arm of the self-locking spring is connected to a moving block that can provide a variable space for torsion of the upper part of the self-locking spring, and the moving block is located in a guide groove set on the main body shell; the inner diameter of the spring is smaller than the middle diameter of the bolt thread.

[0006] In this solution, since the inner diameter of the spring is smaller than the middle diameter of the bolt thread, the self-locking spring is screwed into the bolt thread, and 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 friction force to achieve the purpose of self-locking; the moving block is manually turned to unlock the torsion spring force arm in the variable space, and the self-locking spring is deformed. The inner diameter of the self-locking spring is larger than the middle diameter of the bolt thread. At this time, the bolt can be easily rotated by turning it. This solution uses the moving block to quickly self-lock and unlock the bolt, which is more convenient and quick. Since the lower end of the self-locking spring is fixed to the main body, the self-locking spring locks the bolt to avoid relative rotation between the bolt and the main body. The double locking and fixing bolts that realize spring self-locking and main body fixation have a better anti-loosening effect.

[0007] The mid diameter refers to the effective diameter between the outer diameter of the bolt's external thread and the bottom diameter. The variable space refers to the space in which the spring arm can rotate.

[0008] An improvement on the above scheme, one end of the guide groove is a self-locking end, which is used to limit the upper force arm of the self-locking spring from continuing to rotate toward the self-locking end of the guide groove. In this scheme, due to the limiting effect of the guide groove, the spring can be in a locked state under normal conditions, and the reverse side of the self-locking end is a variable space, providing a variable space for the torsion spring force arm to be unlocked.

[0009] An improvement to the above scheme is that a groove is provided on the main body, and the lower end of the self-locking spring is wound into the corresponding groove of the main body to form a self-locking spring fixing part. In this scheme, the self-locking spring is fixed by extending and bending the lower end of the self-locking spring and winding it on the main body, which simplifies the parts for fixing the self-locking spring and is simple to process.

[0010] As an improvement to the above solution, the plane enclosed by the fixing part of the self-locking spring and the bottom surface of the self-locking spring have an angle, which is an acute angle or an obtuse angle. This solution improves the stability of the connection and fixing of the self-locking spring to the main body.

[0011] As an improvement to the above solution, a knurled pin is arranged in the groove, and the notch diameter of the groove is smaller than the diameter of the knurled pin. This solution utilizes the wire groove of the knurled pin to clamp on the wire diameter of the fixing part, thereby improving the stability of the wire diameter of the fixing part being fixed.

[0012] In a second aspect, the present invention provides a wire clamp with a spring self-locking structure, which comprises a conductive wire clamp body, an insulating shell arranged outside the wire clamp body, and the spring self-locking structure as described above;

[0013] At least one pair of static clamps and dynamic clamps is arranged on the wire clamp body, the dynamic clamp includes a pressure plate, and a bolt rotatably connected to the pressure plate, the bolt passes through the wire clamp body and is threadedly connected thereto, the self-locking spring is wound on the bolt thread, the lower end of the self-locking spring is fixed on the wire clamp body, the upper end force arm of the self-locking spring is connected to a moving block which can provide a variable space for torsion of the upper part of the self-locking spring, and the moving block is located in a guide groove arranged on the insulating shell.

[0014] In this solution, since the inner diameter of the spring is smaller than the middle diameter of the bolt thread, the self-locking spring is screwed into the bolt thread, and 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 friction force, thereby achieving the purpose of self-locking the bolt, so that the self-locking movable clamping plate moves up and down to prevent the static clamping head and the movable clamping head clamping plate from loosening. The manual toggle moving block to torsion spring force arm is unlocked in the variable space, and the self-locking spring is deformed. The inner diameter of the self-locking spring is larger than the middle diameter of the bolt thread. At this time, the bolt is turned, and it can be easily rotated to drive the movable clamping plate to move up or down, thereby disassembling or clamping the cable body between the static clamping head and the clamping plate. In addition, since the lower end of the self-locking spring is fixed on the wire clamp body, the self-locking spring locks the bolt, avoiding the long-term use of the wire clamp, and the relative rotation between the bolt and the wire clamp body, realizing the double locking and fixing of the bolt by the spring self-locking and the wire clamp body fixing, which plays a better role in preventing the bolt from loosening.

[0015] An improvement to the above scheme, the through hole through which the bolt passes through the main body of the wire clamp is divided into a threaded section and a through hole section, the through hole section accommodates the bolt wound with the self-locking spring, and the threaded section is threadedly connected to the bolt, so that the pressure plate connected to the end of the bolt can move up and down to clamp or remove the cable body;

[0016] A groove leading to the end surface of the wire clamp body is arranged at the connection between the through hole section and the threaded section, so as to facilitate the winding and fixing of the lower end of the self-locking spring.

[0017] In this solution, the self-locking spring can be hidden in the through hole section of the wire clamp body, and the insulating shell provided outside the wire clamp body can decompress the volume, reduce costs, and reduce the volume of the entire cable clamp. The groove provided on the wire clamp body facilitates the winding and fixing of the lower end of the self-locking spring.

[0018] An improvement to the above solution is that a blind groove is provided on the top surface of the pressing plate for inserting the end surface of the bolt; a first groove or a first through hole is provided on both sides of the blind groove, and the projection of the first groove or the first through hole is located on the blind groove and is connected to the side end surface of the pressing plate;

[0019] A second groove is arranged on the circumference of the screw rod away from the bolt head;

[0020] The notch diameter of the first groove is smaller than the diameter of the pin body. The pin body passes through the first groove or the first through hole and the second groove of the screw rod on both sides of the blind groove to rotate and connect the pressure plate and the bolt.

[0021] In this solution, the distance between the pin bodies on both sides of the blind hole is larger than the diameter of the second groove of the screw rod and smaller than the outer diameter of the screw rod, so that the second groove of the screw rod is clamped and the bolt is rotatably connected with the pressure plate. Due to the blind groove, the pin body and the second groove of the screw rod, the structure is simple, the processing technology is simple, and the cost is reduced.

[0022] As an improvement to the above solution, a guide rail is integrally arranged on the wire clamp body, and a slot adapted to the guide rail is arranged on the moving block, and the slot slides along the guide rail.

[0023] In this solution, the integrated guide rail of the wire clamp body is slidably connected to the slot of the moving block, which reduces the influence of the relative displacement between the shell and the wire clamp body on the torsion of the self-locking spring force arm and improves the stability of the torsion of the self-locking spring force arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a spring self-locking structure provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the top view of the self-locking spring provided by the present invention;

[0026] Figure 3 It is a left-side structural schematic diagram of the self-locking spring provided by the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the knurled pin provided by the present invention;

[0028] Figure 5 It is a structural schematic diagram of a wire clamp with a spring self-locking structure provided by an embodiment of the present invention;

[0029] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 7 It is a schematic diagram of the structure of an insulating shell of a wire clamp with a spring self-locking structure provided by an embodiment of the present invention;

[0031] Figure 8 The present invention is a schematic structural diagram of a bolt of a wire clamp with a spring self-locking structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figure 1 , is a schematic diagram of a spring self-locking structure provided by an embodiment of the present invention, the spring self-locking structure 100 comprises a bolt 110 and a self-locking spring 120 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 main body, the upper end force arm 121 of the self-locking spring is connected to a moving block 130, and the moving block is located in a guide groove 150 matched therewith. One end of the guide groove is a self-locking end 122, and the other end of the guide groove is an unlocking end 123, and a variable space for the torsion of the upper part of the spring is provided between the unlocking end and the self-locking end.

[0036] 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 friction force to achieve the purpose of self-locking.

[0037] The self-locking spring of this embodiment rotates counterclockwise when viewed from above. Under normal circumstances, 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 force arm of the self-locking spring through the moving block, making the self-locking more secure and stable.

[0038] When the moving block is manually moved toward the unlocking end, due to the variable space in the guide groove, the force arm of the self-locking spring is twisted by the external force of the moving block, and the self-locking spring is deformed. The inner diameter of the self-locking spring is larger than the middle diameter of the bolt thread. At this time, the bolt can be easily rotated by turning it.

[0039] The main body is provided with a groove, and the lower end of the self-locking spring is wound around to form a fixing part 124 of the self-locking spring in the corresponding groove of the main body to fix the locking spring. The plane enclosed by the fixing part of the self-locking spring has an angle with the bottom surface of the self-locking spring, and the angle is an acute angle or an obtuse angle, so as to reduce the shaking of the fixing part in the groove.

[0040] Since the wire diameter of the spring is relatively thin, a knurled pin 140 is placed in the groove, and the wire groove of the knurled pin presses the wire diameter of the fixed part. Even if the wire diameter of the fixed part shakes, it rolls through the wire groove 1411 of the knurled pin, and the next knurled pin wire groove continues to press on the wire diameter of the fixed part, thereby improving the stability of the wire diameter of the fixed part.

[0041] See also Figure 5 , is a schematic diagram of the structure of a wire clamp with a spring self-locking structure provided by an embodiment of the present invention. The wire clamp 200 with a spring self-locking structure includes a wire clamp body 210 made of metal, an insulating shell 220 arranged outside the wire clamp body, and the spring self-locking mechanism 100 of the above embodiment. Two static clamps 230 are arranged on the wire clamp body, and dynamic clamps are arranged corresponding to the static clamps. The static clamp and the dynamic clamp clamp the cable body 300.

[0042] The dynamic clamp includes a pressing plate 241 and a bolt 110 rotatably connected to the pressing plate. The bolt passes through a through hole provided on the clamp body, and the through hole is divided into a threaded section 211 and a through hole section 212. The through hole section accommodates the bolt wound with the self-locking spring, and the threaded section is threadedly connected to the bolt, so that the pressing plate connected to the end of the bolt can move up and down to clamp or remove the cable body with the static clamp. A groove 213 leading to the end face of the clamp body is provided at the connection between the through hole section and the threaded section, so as to facilitate the winding and fixing of the lower end of the self-locking spring.

[0043] A guide rail 214 is integrally arranged on the wire clamp body, and a slot 131 adapted to the guide rail is arranged on the moving block 130 of the spring self-locking structure. The slot 131 slides along the guide rail 214 to change the unlocking or locking working state of the moving block; a protrusion 132 for connecting the force arm of the self-locking spring is arranged above the slot, and an insulating shell is arranged outside the wire clamp body, and a guide groove 221 is left on the insulating shell, through which the moving block 130 passes, and the guide groove limits the self-locking end 222 of the moving block, and provides a variable space for twisting and unlocking the upper part of the self-locking spring. The other end of the guide groove 221 is an unlocking end 223. The moving block is an insulator structure.

[0044] The fixing part of the spring self-locking structure is wound in the groove 213 of the wire clamp body, and the groove cooperates with the knurled pin 140 to press the wire diameter of the lower end of the spring to reduce the shaking of the fixing part in the groove.

[0045] The moving block acts on the self-locking spring to realize self-locking or unlocking the bolt. Please refer to the working principle of the spring self-locking mechanism, which will not be repeated here.

[0046] A blind groove 2411 is provided on the top surface of the pressure plate, and the end face of the bolt 110 is inserted. A second groove is provided on the bolt rod away from the bolt head, preferably a circumferential arc groove 111 smaller than the inner diameter of the bolt thread. Two first grooves 2412 or first through holes are provided on the pressure plate on both sides of the blind groove, and the projections of the two groove bodies or the first through holes are located on the blind groove and connected to the side end face of the pressure plate; the notch diameter of the groove body is smaller than the diameter of the knurled pin, and when the knurled pin 141 is inserted from the two first grooves 2412 or the first through hole on the side end face of the pressure plate, it also passes through the circumferential arc groove 111 of the bolt, thereby rotating the connecting bolt and the pressure plate. The upward or downward twisting of the bolt drives the pressure plate to disassemble or clamp the cable body.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. Spring self-locking structure, characterized in that: It includes a bolt and a self-locking spring wound in the bolt thread, the self-locking spring is a spiral torsion spring; the lower end of the self-locking spring is fixed on a main body matched with the bolt, the upper end force arm of the self-locking spring is connected to a moving block that can provide a variable space for the upper torsion of the self-locking spring, and the moving block is located in a guide groove set on the main body shell; the inner diameter of the spring is smaller than the median diameter of the bolt thread.

2. The spring self-locking structure according to claim 1, characterized in that: One end of the guide groove is a self-locking end, which is used to limit the upper force arm of the self-locking spring from continuing to rotate toward the self-locking end of the guide groove.

3. The spring self-locking structure according to claim 1, characterized in that: The main body is provided with a groove, and the lower end of the self-locking spring is wound into the groove corresponding to the main body to form a self-locking spring fixing part.

4. The spring self-locking structure according to claim 3, characterized in that: An angle is formed between a plane enclosed by the fixing portion of the self-locking spring and the bottom surface of the self-locking spring, and the angle is an acute angle or an obtuse angle.

5. The spring self-locking structure according to claim 3, characterized in that: A knurled pin is arranged in the groove, and the notch diameter of the groove is smaller than the diameter of the knurled pin.

6. A wire clamp with a spring self-locking structure, comprising a conductive wire clamp body, an insulating shell arranged outside the wire clamp body, and a spring self-locking structure as claimed in any one of claims 1 to 5; At least one pair of static clamps and dynamic clamps is arranged on the wire clamp body, the dynamic clamp includes a pressure plate, and a bolt rotatably connected to the pressure plate, the bolt passes through the wire clamp body and is threadedly connected thereto, the self-locking spring is wound on the bolt thread, the lower end of the self-locking spring is fixed on the wire clamp body, the upper end force arm of the self-locking spring is connected to a moving block which can provide a variable space for torsion of the upper part of the self-locking spring, and the moving block is located in a guide groove arranged on the insulating shell.

7. The wire clamp with a spring self-locking structure as claimed in claim 6, characterized in that: The through hole through which the bolt passes through the main body of the wire clamp is divided into a threaded section and a through hole section. The through hole section accommodates the bolt wound with the self-locking spring, and the threaded section is threadedly connected to the bolt so that the pressing plate connected to the end of the bolt can move up and down to clamp or remove the cable body; A groove leading to the end surface of the wire clamp body is arranged at the connection between the through hole section and the threaded section, so as to facilitate the winding and fixing of the lower end of the self-locking spring.

8. The wire clamp with a spring self-locking structure as claimed in claim 6, characterized in that: A blind groove is provided on the top surface of the pressing plate for inserting the end surface of the bolt; first grooves or first through holes are provided on both sides of the blind groove, and the projection of the first groove or the first through hole is located on the blind groove and is connected to the side end surface of the pressing plate; A second groove is arranged on the circumference of the screw rod away from the bolt head; The notch diameter of the first groove is smaller than the diameter of the pin body. The pin body passes through the first groove or the first through hole and the second groove of the screw rod on both sides of the blind groove to rotate and connect the pressure plate and the bolt.

9. The wire clamp with a spring self-locking structure as claimed in claim 6, characterized in that: A guide rail is integrally arranged on the wire clamp body, and a clamping groove adapted to the guide rail is arranged on the moving block, and the clamping groove slides along the guide rail.

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