Pre-tightening wedge-shaped wire clamp

Abstract

A pre-tightening wedge-shaped wire clamp belongs to the technical field of cable installation fittings and comprises a clamping block and a wedge-shaped block, the clamping block is provided with a wedge-shaped hole of a penetrating structure, and the wedge-shaped block is arranged in the wedge-shaped hole in a penetrating mode; one-way clamping jaws are arranged at the middle sections of the two inner inclined surfaces of the wedge-shaped hole, and the one-way clamping jaws obliquely face the middle part of the small end of the wedge-shaped hole; a limiting rod is arranged in the small end of the clamping block and located in the middle of the two inner inclined faces. A strip-shaped groove is formed in the small end of the wedge-shaped block, the width of the strip-shaped groove is smaller than that of the limiting rod, paired clamping grooves are formed in the inner walls of the two sides of the strip-shaped groove and used for clamping the limiting rod, the side, facing the root of the strip-shaped groove, of each clamping groove is an inclined face, and the side, facing the opening end of the strip-shaped groove, of each clamping groove is perpendicular to the inner wall of the strip-shaped groove; when the limiting rod is located in the clamping groove, the cable makes contact with the outer inclined face of the wedge-shaped block and the inner inclined face of the wedge-shaped hole at the same time. According to the scheme, the cable can be effectively prevented from loosening, the clamping force can be automatically increased, and the clamping force on the cable is kept.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of overhead cable tensioning fittings, and particularly relates to a pre-tightening wedge-shaped cable clamp. BACKGROUND

[0002] In the process of power grid erection, the wedge-shaped cable clamp is a widely used connecting fitting for fixing cables and bearing cable tension. The wedge-shaped cable clamp generally comprises a clamp block and a wedge-shaped block. The clamp block has a wedge-shaped hole with a through structure. The wedge-shaped block is matched with the wedge-shaped hole in shape. The wedge-shaped block has grooves on the two sides of the inclined surface for limiting the cable. When tensioned, the end of the cable passes through the small end of the wedge-shaped hole and is arranged between the grooves on the two sides of the wedge-shaped block and the inner wall of the wedge-shaped hole. The wedge-shaped block is pulled towards the small end of the wedge-shaped hole by the cable, and the cable is pressed on the inner wall of the wedge-shaped hole by the wedge-shaped block, so as to achieve the purpose of clamping the cable.

[0003] The existing wedge-shaped cable clamp structure is relatively simple. Although the cable has a certain tension on the wedge-shaped block during installation, the wedge-shaped block is tightly pressed in the wedge-shaped hole. When the overhead cable is impacted by the wind, it will oscillate. During the oscillation process, the tension of the cable on the wedge-shaped block will change, which can easily cause the wedge-shaped block to loosen, thereby reducing the pressing force of the wedge-shaped block on the cable and affecting the clamping effect of the clamp on the cable. On the other hand, the existing wedge-shaped cable clamp is usually an independent part without a connecting structure between the clamp block and the wedge-shaped block before assembly. Therefore, the clamp block and the wedge-shaped block need to be stored or fixed separately during high-altitude operation. Such structure not only increases the process of installing the wedge-shaped block and the clamp block during assembly, but also is inconvenient for overall storage and taking, which affects the smoothness of high-altitude operation. SUMMARY

[0004] To solve the problems of the prior art, the present application provides a pre-tightening wedge-shaped cable clamp. The clamp block and the wedge-shaped block are connected to each other, which is convenient for taking and storing during operation, can effectively prevent the cable from loosening, and can automatically increase the clamping force to maintain the clamping force on the cable.

[0005] In order to achieve the purpose of the present application, the following scheme is adopted: A pre-tightening wedge-shaped cable clamp comprises a clamp block and a wedge-shaped block. The clamp block has a wedge-shaped hole with a through structure. The wedge-shaped block is arranged in the wedge-shaped hole. The outer inclined surface of the wedge-shaped block on the two sides corresponds to and is parallel to the inner inclined surface of the wedge-shaped hole. The middle section of the two inner inclined surfaces of the wedge-shaped hole is provided with a one-way clamping jaw, which is inclined towards the middle of the small end of the wedge-shaped hole. The inside of the small end of the clamp block is provided with a limiting rod, which is parallel to the two inner inclined surfaces of the wedge-shaped hole and located between the two inner inclined surfaces. The small end of the wedge-shaped block is provided with a strip-shaped slot, the width of the strip-shaped slot is smaller than the width of the limiting rod, a pair of clamping slots are provided on the inner walls of the two sides of the strip-shaped slot, and the clamping slots are used for clamping the limiting rod. When the limiting rod is located in the clamping slot, the cable is in contact with the outer inclined surface of the wedge-shaped block and the inner inclined surface of the wedge-shaped hole.

[0006] The beneficial effects of the present application are: 1. The wedge-shaped block and the clamping block are integrally connected before installation by the cooperation of the limiting rod and the clamping slot, which facilitates complete taking and use. 2. In the use process, the wedge-shaped block can automatically increase the clamping force on the cable to prevent the cable from loosening due to the instantaneous tension generated by the cable oscillation. 3. The limiting rod and the strip-shaped slot are connected to ensure that the wedge-shaped block is always in the middle position of the wedge-shaped hole, so that the cables on both sides of the wedge-shaped block have the same compression force, and the cable loosening caused by the wedge-shaped block shifting in the wedge-shaped hole is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0007] The drawings described herein are only for illustrating selected embodiments, not all possible embodiments, and are not intended to limit the scope of the present application.

[0008] Figure 1 An exploded view of the structure of a preferred scheme of the present application is shown.

[0009] Figure 2 A top view of a preferred scheme of the present application is shown.

[0010] Figure 3 A sectional view along the A-A direction of the middle is shown. Figure 2

[0011] Figure 4 A partial sectional view of another preferred scheme of the present application is shown.

[0012] Marked in the figure: clamping block-1, strip-shaped counterbore-11, pawl-12, wedge-shaped block-2, strip-shaped slot-21, clamping slot-211, one-way clamping claw-3, spring plate-31, ratchet-32, limiting rod-4. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail below in combination with the drawings, but the described embodiments of the present application are only part of the embodiments, not all the embodiments.

[0014] As Figures 1 to 3 ​As shown, a pre-tightening wedge-shaped cable clamp comprises a clamp block 1 and a wedge-shaped block 2, the clamp block 1 has a wedge-shaped hole through the structure, the wedge-shaped block 2 is arranged in the wedge-shaped hole, the outer inclined surfaces on both sides of the wedge-shaped block 2 correspond to the inner inclined surfaces of the wedge-shaped hole one by one and are parallel to each other.

[0015] The middle sections of the two inner inclined surfaces of the wedge-shaped hole are provided with one-way clamping claws 3, which are inclined towards the middle of the small end of the wedge-shaped hole.

[0016] Preferably, one side of the one-way clamping claw 3 towards the middle of the wedge-shaped hole has a circular arc notch for matching the cross-sectional profile of the cable, increasing the contact area with the cross section of the cable, thereby improving the compression effect on the cable.

[0017] The inside of the small end of the clamp block 1 is provided with a limiting rod 4, which is parallel to the two inner inclined surfaces of the wedge-shaped hole and located at the position between the two inner inclined surfaces.

[0018] The small end of the wedge-shaped block 2 is provided with a strip-shaped slot 21, the width of the strip-shaped slot 21 is smaller than the width of the limiting rod 4, a pair of clamping grooves 211 are provided on the inner walls of the two sides of the strip-shaped slot 21, the limiting rod 4 is clamped in the clamping grooves 211, so that the wedge-shaped block 2 is connected with the clamping block 1 as a whole, which is convenient for the operator to carry when working in the air, the side of the clamping groove 211 facing the root of the strip-shaped slot 21 is a slope, which is convenient for the limiting rod 4 to slide to the upper end of the strip-shaped slot 21, or the cross section of the clamping groove 211 is designed as a V-shaped structure, which can also achieve the above effect, the side of the clamping groove 211 facing the opening end of the strip-shaped slot 21 is perpendicular to the inner wall of the strip-shaped slot 21, so as to prevent the limiting rod 4 from sliding out of the opening end of the strip-shaped slot 21; when the limiting rod 4 is located in the clamping groove 211, the cable is in contact with the outer slope of the wedge-shaped block 2 and the inner slope of the wedge-shaped hole at the same time, so that the U-shaped slot formed by the wedge-shaped block 2 and the wedge-shaped hole realizes the pre-pressing effect on the cable, so as to prevent the line clamp from falling off before the cable is completely tensioned. Therefore, when the cable is tensioned, under the action of the tension of the cable, the wedge-shaped block 2 will inevitably move to the small end of the wedge-shaped hole, so that the limiting rod 4 will move out of the clamping groove 211 and move to the root of the strip-shaped slot 21. In this process, the limiting rod 4 will make the strip-shaped slot 21 open outward, so that the two sides of the small end of the wedge-shaped block 2 are expanded outward, so that the outer side of the wedge-shaped block 2 is close to the one-way claw 3, further reducing the distance between the two sides of the small end of the wedge-shaped block 2 and the inner slope of the wedge-shaped hole, and increasing the pressing force on the cable. This structure makes the distance and angle between the outer slopes of the two sides of the wedge-shaped block 2 variable, and as the overhead cable is worn and thinned by tension, the distance between the outer slopes will automatically increase, thereby maintaining the clamping effect on the cable. At this time, the one-way claw 3 is pressed on the outer arc surface of the bent cable, and the outer slopes of the two sides of the wedge-shaped block 2 are pressed on the inner arc surface of the cable, and the cable is clamped in the above manner; because the one-way claw 3 is inclined towards the small end of the wedge-shaped hole, it not only facilitates the smooth sliding of the cable to the small end of the wedge-shaped hole during tensioning, avoids increasing the moving resistance of the cable in the line clamp during tensioning, but also after tensioning, the cable is clamped by the one-way claw 3, which can prevent the cable from sliding to the large end of the wedge-shaped hole, thereby preventing the cable from moving when subjected to vibration, thereby ensuring the stability of clamping the cable.

[0019] Preferably, as shown in Figure 1 , Figure 3 , a circular hole structure is provided at the root of the strip-shaped slot 21, the inner diameter of the circular hole is larger than the width of the strip-shaped slot 21, so as to prevent stress concentration and cause cracks at the root of the strip-shaped slot 21, and also increase the elastic deformation amount between the two sides of the wedge-shaped block 2, so that the outer slopes of the two sides of the wedge-shaped block 2 have a larger range of movement to adapt to cables with a larger diameter range.

[0020] Preferably, as shown in Figure 1 , Figure 3As shown, the clamping groove 211 is provided with multiple positions along the length direction of the strip-shaped groove 21, when the cable is tensioned, the limiting rod 4 is located in one of the strip-shaped grooves 21 to prevent the wedge-shaped block 2 from moving towards the large end of the wedge-shaped hole during the cable oscillation, thereby preventing the cable from loosening; even if the limiting rod 4 is located between the adjacent clamping grooves 211 and is compressed between the inner walls of the strip-shaped groove 21, as long as the wedge-shaped block 2 moves along the length direction of the strip-shaped groove 21 relative to the clamping block 1, the limiting rod 4 will quickly enter the adjacent clamping groove 211 to prevent the movement range of the wedge-shaped block 2 from further increasing, thereby preventing the cable from further loosening.

[0021] Further preferably, as shown in Figure 1 , Figure 3 , the distance between the clamping grooves 211 of the strip-shaped groove 21 arranged in pairs gradually decreases from the opening end to the other end of the strip-shaped groove 21, that is, the distance between the clamping grooves 211 arranged in pairs at the opening end of the strip-shaped groove 21 is greater than the distance between the clamping grooves 211 arranged in pairs at the root of the strip-shaped groove 21, this structural design enables the wire clamp to have the functions of automatic tensioning and self-locking. In a specific scheme, the limiting rod 4 is clamped in the clamping groove 211 at the opening end or middle section of the strip-shaped groove 21 when tensioned, under the blowing action of the wind, the cable oscillates, and there is inevitably a momentary tension greater than the tension of the cable during installation, the above-mentioned scheme of the present application has solved the problem that the movement of the wedge-shaped block 2 in the wedge-shaped hole caused by oscillation leads to loosening of the cable, but with long-term tension, it is inevitable that the outer diameter of the cable harness will gradually decrease, thereby causing the compression force of the cable by the wire clamp to decrease. After adopting the structural design of the present scheme, when the cable is subjected to a larger momentary tension and the outer diameter of the harness decreases, the cable will pull the wedge-shaped block 2 to move towards the opening end of the strip-shaped groove 21, thereby causing the limiting rod 4 to move towards the root of the strip-shaped groove 21 and be clamped in the clamping groove 211 close to the root of the strip-shaped groove 21, because the distance between the clamping grooves 211 arranged in pairs at the opening end of the strip-shaped groove 21 is greater than the distance between the clamping grooves 211 arranged in pairs at the root of the strip-shaped groove 21, when the limiting rod 4 gradually cooperates with the clamping groove 211 close to the root of the strip-shaped groove 21, the limiting rod 4 will further cause the wedge-shaped block 2 to be spread apart along the strip-shaped groove 21 to the two sides, further reducing the distance between the small end of the wedge-shaped block 2 and the inclined surface in the wedge-shaped hole, automatically increasing the clamping force on the cable, and automatically locking the position of the wedge-shaped block 2 in the wedge-shaped hole by the cooperation between the clamping groove 211 and the limiting rod 4.

[0022] Preferably, as shown in Figure 1 , the limiting rod 4 is detachably provided on the clamping block 1, when the wire clamp is removed, the limiting rod 4 is first removed, thereby removing the limitation on the wedge-shaped block 2, allowing the wedge-shaped block 2 to move towards the large end of the wedge-shaped hole, thereby loosening the cable.

[0023] Preferably, as shown in Figure 1 , Figure 3As shown, a one-way chuck 3 is disposed on the surface of a spring plate 31, and multiple one-way chucks 3 are provided along the length direction of the spring plate 31. A strip-shaped countersunk hole 11 is formed on the inner inclined surface on both sides of the wedge-shaped hole. The spring plate 31 is disposed within the strip-shaped countersunk hole 11, and the length direction of the spring plate 31 is along the line connecting the large and small ends of the wedge-shaped block. Both ends of the spring plate 31 abut against both ends of the strip-shaped countersunk hole 11. The spring plate 31 is bent into an arc-shaped structure, and the one-way chuck 3 is located on the outer arc surface, with the outer arc surface facing the center of the wedge-shaped hole. When tensioned, the middle section of the spring plate 31 bears pressure, and the direction of pressure is perpendicular to the strip-shaped countersunk hole 11. The bottom surface of the countersunk hole 11 is shaped so that the curvature of the middle section of the spring plate 31 is less than that of the two ends. This structure not only increases the contact range between the spring plate 31 and the cable and improves the friction between them, but also allows the spring plate 31 to automatically adapt to the diameter of the cable harness. Even if the cable is stretched and becomes thinner, the spring plate 31 can automatically adapt to the cable, thereby ensuring continuous clamping force. Furthermore, the deformation function of the spring plate 31 itself can also adapt to the change in the included angle between the outer inclined surfaces on both sides of the wedge block 2, thereby maintaining the maximum contact area with the cable at all times and ensuring the continuity and reliability of the clamping force.

[0024] Preferred, such as Figure 4 As shown, a ratchet 32 ​​with ratchet teeth serves as a one-way pawl 3. The ratchet 32 ​​is rotatably mounted on the side wall of the clamping block 1. The one-way pawl 3, located inside the wedge-shaped hole, protrudes from the inner inclined surface of the wedge-shaped hole and is angled downwards towards the smaller end of the wedge-shaped hole. The clamping block 1 is equipped with a pawl 12 to restrict the ratchet 32 ​​from rotating in the opposite direction of the one-way pawl 3's tilt. Therefore, the ratchet 32 ​​can only rotate when the cable moves towards the smaller end of the wedge-shaped hole during the cable tensioning process. By using the pawl 12 to restrict the ratchet 32, the ratchet 32 ​​is prevented from rotating when the cable moves towards the larger end of the wedge-shaped hole. This restricts the cable's movement towards the larger end of the wedge-shaped hole, thereby achieving the purpose of locking the cable. Since the ratchet 32 ​​typically has multiple ratchet teeth arranged in a circumferential array, the one-way pawl 3 is also arranged in multiple circumferential arrays along the ratchet 32. Specifically, the clamping block 1 has a circular hole on the inner inclined surface corresponding to the wedge-shaped hole. The ratchet 32 ​​is located in the circular hole, and the pin coaxially arranged with the ratchet 32 ​​rotates through the clamping block 1. The one-way pawls 3 on both sides of the ratchet 32 ​​protrude from the inner wall and outer wall of the clamping block 1, respectively. The pawl 12 is located on the outer wall of the clamping block 1 and is used to restrict the ratchet 32 ​​from rotating in the opposite direction of the one-way pawl 3 by cooperating with the one-way pawl 3.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A pre-tightened wedge clamp, comprising: The clamping block (1) and the wedge block (2) are characterized in that the clamping block (1) has a through-hole wedge-shaped hole, the wedge block (2) is inserted into the wedge-shaped hole, and the outer inclined surfaces on both sides of the wedge block (2) correspond one-to-one with the inner inclined surfaces of the wedge-shaped hole and are parallel to each other. The two inner inclined surfaces of the wedge hole are provided with one-way claws (3), which are inclined towards the middle of the small end of the wedge hole; The small end of the clamping block (1) is provided with a limiting rod (4), which is parallel to the two inner inclined surfaces of the wedge hole and is located in the middle of the two inner inclined surfaces; The small end of the wedge block (2) is provided with a strip groove (21). The width of the strip groove (21) is less than the width of the limiting rod (4). Pairs of slots (211) are provided on the inner walls of both sides of the strip groove (21) for locking the limiting rod (4). The side of the slot (211) facing the root of the strip groove (21) is an inclined surface. The side of the slot (211) facing the opening end of the strip groove (21) is perpendicular to the inner wall of the strip groove (21). When the limiting rod (4) is inside the slot (211), the cable is in contact with the outer inclined surface of the wedge block (2) and the inner inclined surface of the wedge hole at the same time.

2. The pre-tightened wedge clamp according to claim 1, characterized in that, The root of the strip groove (21) is provided with a circular hole structure, and the inner diameter of the circular hole is larger than the width of the strip groove (21).

3. A pre-tightened wedge clamp according to claim 1, characterized in that, The slot (211) is provided in multiple places along the length of the strip groove (21). When the cable is tensioned, the limiting rod (4) is located in one of the strip grooves (21).

4. A pre-tightened wedge clamp according to claim 3, characterized in that, The distance between the slots (211) of the strip groove (21) arranged in pairs gradually decreases from the open end of the strip groove (21) to the other end.

5. A pre-tightened wedge clamp according to claim 1, characterized in that, The limiting rod (4) is detachably mounted on the clamping block (1).

6. A pre-tightened wedge clamp according to claim 1, characterized in that, One-way claws (3) are provided on the surface of a spring plate (31), and multiple one-way claws (3) are provided along the length direction of the spring plate (31). Strip-shaped countersunk holes (11) are provided on the inner inclined surfaces on both sides of the wedge-shaped hole. The spring plate (31) is located in the strip-shaped countersunk hole (11). The length direction of the spring plate (31) is set along the line connecting the large end and the small end of the wedge block. The two ends of the spring plate (31) abut against the two ends of the strip-shaped countersunk hole (11). The spring plate (31) is bent into an arc structure. The one-way claws (3) are located on the outer arc surface, and the outer arc surface faces the middle of the wedge-shaped hole. When tensioned, the middle section of the spring plate (31) bears pressure, and the pressure direction is perpendicular to the bottom surface of the strip-shaped countersunk hole (11).

7. A pre-tightened wedge clamp according to claim 1, characterized in that, Using the ratchet teeth of a ratchet (32) as a one-way pawl (3), the ratchet (32) is rotated on the side wall of the clamping block (1), and the one-way pawl (3) located inside the wedge-shaped hole protrudes from the inner inclined surface of the wedge-shaped hole. The clamping block (1) is provided with a pawl (12) to restrict the ratchet (32) from rotating in the opposite direction of the one-way pawl (3).

8. A pre-tightened wedge clamp according to claim 1, characterized in that, The one-way chuck (3) has an arc notch on one side facing the middle of the wedge hole.

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