CN107181204B - Electrification in high voltage stringing protector - Google Patents

Abstract

The invention discloses a high-voltage electrified wire tight protector, which includes a cable and two hooks, and also includes a fixed box; the fixed box is a flat hollow box body penetrating in the length direction, and a hook is connected to the upper end; the fixed box is equipped with a pull Cable pulley, there is a rotating block shaft directly below the cable pulley, the axial direction of the rotating block shaft is the thickness direction of the fixed box, the rotating block is sleeved on the rotating block shaft and can rotate freely; the length direction of the rotating block is the left and right direction, and the left and right ends are equal There is an acute angle upwards and outwards; the brake block is fixed on one of the left and right sides of the fixed box, the side wall of the brake block facing the rotating block is the outer braking wall, and the side wall corresponding to the rotating block is the inner one. The moving wall, the gap between the two is matched and the shape is adapted; the cable enters the box body from the lower end, bypasses the cable pulley, passes through the gap between the outer braking wall and the inner braking wall, and returns to the bottom of the box body. There is another hook fixed on it. The beneficial effect of the invention is that it has the advantages of convenient operation and good insurance effect.

Description

High voltage live tight wire protector

technical field

The invention belongs to the field of electric construction tools, in particular to a high-voltage electrified wire tight protector.

Background technique

The overhead transmission lines of high-voltage electricity need to be equipped with ground wires, and the ground wires need to be tensioned. Traditionally, when tightening the ground wire, a wire tensioner is used. For example, the Chinese patent document CN203734217U disclosed on July 23, 2014 "a straight line to tension tensioner for overhead lines", including a fixed bracket, two rope tightening mechanisms, a driving gear, a transmission handle, two traction ropes and two Moving pulley; the two rope tightening mechanisms respectively include a driven gear, a stop ratchet, a ratchet and a rope tightening reel, the rope tightening reel is rotatably installed on a fixed bracket, and the driven gear and the stop ratchet are connected with the rope tightening reel respectively. Coaxial linkage, the pawl can be rotatably installed on the fixed bracket, and meshed with the stop ratchet; the two tight rope reels are respectively connected with the two moving pulleys through the traction rope; the driving gear is connected with the driven gear of the two tight rope mechanisms at the same time Engage and link with the transmission handle to simultaneously drive the two rope tightening reels of the two rope tightening mechanisms to rotate to achieve two-way traction and tighten the line. In order to protect employees, power equipment, and power lines, two wire tensioners in parallel are always used in actual construction. The main wire tensioner is used to tension the ground wire, and the auxiliary wire tensioner is used as insurance. When the main wire tensioner is loose and the sliding tooth fails, the auxiliary wire tensioner can instantly pull the two ends of the ground wire that need to be tensioned to avoid accidents. However, as the thread tensioner disclosed in the aforementioned prior art, when used as a secondary thread tensioner, it needs to follow the thread tightening accuracy of the main thread tensioner to slowly and continuously tighten the thread ends at both ends, and its structure is too complicated. The operation is too cumbersome, which is equivalent to repeating the thread tightening operation with the auxiliary thread tensioner, resulting in low construction efficiency.

Contents of the invention

The technical problem to be solved in the present invention is that the auxiliary wire tensioner is used as insurance in the existing electric power line tightening construction, which is cumbersome to operate and low in working efficiency, so a high-voltage live line tensioner is provided, which has the advantages of convenient operation and good insurance effect Advantage.

In order to achieve the above object, the present invention adopts the following technical solutions: a high-voltage live wire tight protector, including a cable and two hooks, and also includes a fixed box; the fixed box is a flat hollow box that runs through the length direction, and the upper end is connected Hook; there is a cable pulley in the fixed box, and a rotating block shaft is arranged directly below the cable pulley. The axial direction of the rotating block shaft is the thickness direction of the fixed box. For the left and right directions, the left and right ends are provided with an acute angle upward and outward; the brake block is fixed on the left and right sides of the fixed box, and the side wall of the brake block facing the rotating block is the outer braking wall. The corresponding side wall is the inner brake wall, and the gap fits and the shape is adapted between the two; when the rotating block turns to the direction of the brake block, the inner brake wall touches the outer brake wall, and the gap disappears; The lower end enters the box body, walks around the cable pulley, passes through the gap between the outer braking wall and the inner braking wall, and returns to the lower side of the box body, on which another hook is fixed.

The tight wire protector designed by this technical scheme is provided with a fixed box, which is a flat hollow box body that runs through in the length direction, similar to a matchbox, and the structure for adjusting the dragline is arranged in the box body. The upper end of the box body can be connected with a hook through the hook fixing pin. There is a rotating block connected to the casing through the rotating block shaft. The length direction of the rotating block is the left and right directions under normal conditions. The left and right ends of the rotating block are also provided with acute angles, and the direction is upward and outward, so as to bypass the upper cable pulley. The drag cable can easily touch the acute angle, and form a thrust to push the rotating block to rotate through the friction force. One side of the left and right directions in the box body is fixed with a brake block, which can usually be designed as a triangular or quadrilateral structure protruding along the side wall of the box body, and the side close to the rotating block is the outer brake wall, while Correspondingly, the side of the rotating block close to the automatic block is the inner braking wall, the shape of the outer braking wall and the inner braking wall are adapted, and there is a gap between the two under normal conditions, and the cable passes through it. It can be pulled forward normally, but when the cable is pulled in the reverse direction in an emergency, the cable will rely on friction to hang on the acute angle at one end of the brake block, and push the rotating block to rotate, so that the rotating block approaches the brake block until the inner The braking wall is infinitely close to the outer braking wall, forming a strong enough static friction force to clamp the cable clamped between the inner braking wall and the outer braking wall so that it cannot be pulled.

Preferably, engravings are provided on the surfaces of the inner braking wall and the outer braking wall. Such design is to make the surfaces of the inner braking wall and the outer braking wall have greater roughness, and the two can form greater static friction force after the drag cable is clamped.

Preferably, the inner braking wall is in a convex arc shape, and the outer braking wall is in a suitable concave arc shape. The convex arc shape and the concave arc shape can increase the contact area between the inner braking wall and the outer braking wall on the clamped cable and increase the static friction force. The concavo-convex direction of the arc can also be set synchronously and reversely, the inner braking wall is an inner concave arc, and the outer braking wall is a suitable outer convex arc.

Preferably, the rotating block has a left-right symmetrical shape, the rotation axis of the rotating block is located on the symmetrical axis, and the center of gravity of the rotating block is located on the side near the brake block of the rotating block. According to the relative position of the inner braking wall and the outer braking wall, when the protector is in use, the inner braking wall should be in a state where the inner braking wall is above the outer braking wall under normal conditions. On one side of the brake block, the inner brake wall and the outer brake wall are always attached to the cable, but because they are not affected by external forces, the forward pull of the cable only needs to overcome the small gravity of the rotating block, basically no Affected, once there is a reverse pull, the rotating block will rotate quickly, and together with the brake block, the cable will be clamped instantly to achieve protection.

As a preference, a limit block is also provided in the fixed box, and the limit block is provided with a loose end limit surface adapted to a side of the rotating block, and the loose end limit face is set to limit the rotation angle of the rotating block away from the brake block . The limiting block is used to form a limiting surface to limit the rotation angle of the rotating block. Generally, it can be designed on a certain side of the rotating block, including the relative position when the top surface or the bottom surface is in different rotation positions. The loose end limit surface is used to limit the rotation angle of the rotating block when it turns away from the brake block, which can avoid the problem that the rotating block is over-steered and cannot contact the cable, and prevents the cable from being unable to pass when it is pulled in the opposite direction in an emergency Possible defect in which friction pushes the turning block to turn.

Preferably, the limit block is also provided with a tight-end limit surface, and the tight-end limit surface limits the rotation angle of the rotating block close to the brake block. In the same way, the limit surface of the tight end can avoid the problem of over-steering in the direction of the brake block and damage caused by excessive force.

Preferably, the limiting block is located directly below the rotating block, and the lower end surface of the rotating block is a plane extending in the left-right direction; The end limit surface is located on the other side; the limit block is fixed in the fixed box by the pin shaft of the limit block. The pin hole of the pin shaft of the limit block is an oblong hole through the thickness direction of the fixed box, and the extension direction of the elongated hole is for the up-down direction. This scheme has designed the pin shaft hole of up and down direction on the fixing box, and the pin shaft of fixed limit block is placed in the pin shaft hole, makes limit block can move up and down along the direction of pin shaft hole. When the drag cable is pulled in the opposite direction, it is difficult to loosen after the drag cable is clamped by the rotating block and the brake block. At this time, the limit block is used to push the rotating block from bottom to top to rotate, so that the rotating block can be quickly released, which is convenient for use.

Preferably, the limiting surface of the tight end is an outwardly convex arcuate surface. The convex arc face has a better pushing effect on the position where the lower end surface of the rotating block is close to the brake block.

Preferably, the limit surface of the loose end is a plane parallel to the lower end surface of the rotating block. There is a better limiting effect between parallel planes.

Preferably, preferably, the cable is closed around, and the hook is fixed on the cable and cannot move axially along the ring of the cable. Using a closed ring-shaped cable will not produce a cable end. Even if the cable clamping effect of the protector fails, it can still rely on the ring of the cable itself to prevent the ground wire from completely loosening.

Preferably, the cable is in the shape of a flat belt, and the width of the cable is adapted to the thickness of the rotating block. The flat belt-shaped cable has a larger contact area with the rotating block and the brake block, and the obtained static friction force is larger.

To sum up, the beneficial effects of the present invention are: it has the advantages of convenient operation and good insurance effect.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the structure inside the fixed box when the cable is in a forward pulling state.

Fig. 3 is a schematic diagram of the structure inside the fixed box when the cable is in a state of reverse pull.

Fig. 4 is an enlarged view of the internal structure of the fixed box.

Among them: 1 cable, 2 hook, 3 fixed box, 4 hook fixed pin, 5 cable pulley, 6 rotating block shaft, 7 rotating block, 8 braking block, 9 limiting block, 10 limiting block pin, 11 Bearing pin hole, 71 inner brake walls, 81 outer brake walls, 91 loose end limit surfaces, 92 tight end limit surfaces; arrows show the pulling direction of the dragline.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

The embodiment shown in Figure 1 is a high-voltage live wire tight protector, which is used as a safety insurance when the ground wire is tightened during electric power construction. This high-voltage live tight wire protector includes a ring-shaped cable 1, two hooks 2, and a fixed box 3. The cable is in the shape of a flat belt and is connected with the fixed box. One of the hooks is fixed on the cable, and the other A hook is fixed on the fixed box by the hook fixing pin 4 passing through the thickness direction of the fixed box.

The fixed box is a flat hollow box similar to a matchbox, which runs through up and down, and a box surface in the thickness direction can be removed for installation and maintenance. Open the box surface, the internal structure is as shown in Figure 4, the cable pulley 5 above is designed, the rotating block rotating shaft 6 is directly below the cable pulley, and the rotating block rotating shaft is the same as the hook fixing pin, and also runs through the thickness direction of the fixed box; A rotating block 7 is sleeved on the rotating shaft of the rotating block, a brake block 8 is fixed on the left side of the rotating block, and a limit block 9 is directly below the rotating block. The rotating block is a symmetrical trapezoid with a long top surface and a short bottom surface, both of which are arranged along the left and right directions and are parallel; The ends each form an upward and outward acute angle. The axis of rotation of the rotating block passes through the line of symmetry of the rotating block, and the center of gravity of the rotating block is located on the left side of the line of symmetry through the built-in weight. The shape of the brake block is similar to an equilateral triangle, and the bottom edge is close to the left side wall of the box body, which has good supporting force. The side wall of the brake block close to the rotating block is designed with a concave arc surface, which is called the outer brake wall 81, and the corresponding side wall of the rotating block is provided with a convex arc. The surface is called the inner braking wall 71. There is a gap between the inner brake wall and the outer brake wall for the cable to pass through, and there are engravings on the contact surfaces of the inner brake wall, the outer brake wall and the cable to improve the friction . When the rotating block rotates counterclockwise, the inner braking wall moves downward to the left and is infinitely close to the outer braking wall, so that the drag cable can be clamped until the drag cable cannot be pulled. Two limit block pin shafts 10 are provided through the limit block, and the two limit block pin shafts are all arranged in the pin shaft holes 11 . The pin hole is an oblong hole arranged on the body of the fixed box, so that the pin shaft of the limiting block passes through the thickness direction of the fixed box, and the limiting block can move up and down. The upper left side of the limit block is provided with a tight end limit surface 92, which is an upwardly convex arc surface. When the limit block is pushed upwards, the tight end limit surface can first contact the bottom surface of the rotating block in the clamped state. Release the clamped state; the upper right side of the limit block is provided with a loose end limit surface 91 with a high inner side and a lower outer side. The lower end surface is limited by the loose end limit surface, and the rotating block cannot continue to rotate clockwise.

When it is necessary to tighten the ground wire during electric power construction, in addition to the main wire tightener pulling the two ends of the ground wire respectively, the two hooks of the protector also pull the two ends of the ground wire respectively to form an insurance. That is to say, it is used in a state where the hook connected to the fixed box is on the top and the hook connected to the cable is on the bottom. When in normal state, the main wire tensioner gradually narrows the distance between the two ends of the ground wire, and the protector also gradually closes the distance between the two hooks thereupon. The state at this time is shown in Figure 2. The cable is in a positive pulling state, that is, clockwise as shown in the figure. When the cable passes through the arc-shaped gap between the inner braking wall and the outer braking wall from bottom to top, it relies The friction force of the inner braking wall and the acute angle at the right end of the rotating block are pulled by the drag cable, which drives the rotating block to rotate clockwise, and the drag cable can continuously pass through the gap clockwise. At the same time, the maximum value of the clockwise rotation angle of the rotating block is limited by the loose end limit surface on the right side above the limit block. After the pulling action stops, because the center of gravity of the rotating block is biased to one side of the brake block, the rotating block resets to a position close to the brake block, ready to prevent the reverse pull of the dragline at any time. Once an accident occurs, the cable is pulled in the opposite direction, that is, the cable is pulled counterclockwise. As shown in Figure 3, the cable drives the acute angle at the left end of the rotating block, and at the same time relies on the friction of the inner braking wall to push the rotating block counterclockwise. Turning clockwise makes the arc-shaped gap between the inner braking wall and the outer braking wall tighter and tighter, and the static friction force becomes larger and larger, until the cable cannot be pulled counterclockwise, and the protection effect is realized. Afterwards, if you need to loosen the clamping state between the rotating block and the brake block, you can pull the cable clockwise. If the clamping state is very tight, you can also push the limit block upwards to limit the position with the tight end on the limit block. Push the left side of the lower end surface of the rotating block to help release the clamping state.

Claims (10)

1. A high-voltage live wire protector, including a cable (1) and two hooks (2), characterized in that it also includes a fixed box (3); the fixed box is a flat hollow box that runs through in the length direction, The upper end is connected with a hook; there is a cable pulley (5) inside the fixed box, and a rotating block rotating shaft (6) is arranged directly below the cable pulley, the axial direction of the rotating block rotating shaft is the thickness direction of the fixed box, and the rotating block (7) is sleeved on the The shaft of the rotating block can rotate freely; the length direction of the rotating block is left and right, and the left and right ends are all provided with an acute angle upward and outward; the brake block (8) is fixed on one side of the left and right of the fixed box, and the The side wall facing the rotating block is the outer braking wall (81), and the corresponding side wall of the rotating block is the inner braking wall (71). When the direction turns, the inner brake wall touches the outer brake wall, and the gap disappears; the cable enters the box body from the lower end, bypasses the cable pulley, passes through the gap between the outer brake wall and the inner brake wall, and returns to the box Below the body, another hook is fixed on it. 2. A high-voltage live wire tight protector according to claim 1, characterized in that, the inner braking wall is in a convex arc shape, and the outer braking wall is in a suitable concave arc shape. 3. A high-voltage live wire tight protector according to claim 1 or 2, characterized in that, the rotating block has a left-right symmetrical shape, the rotating shaft of the rotating block is located on the symmetrical axis, and the center of gravity of the rotating block is located near the rotating block. brake pad side. 4. A high-voltage live wire tight protector according to claim 1 or 2, characterized in that, a limit block (9) is also provided in the fixed box, and the limit block is provided with a side that is adapted to a certain side of the rotating block. The loose end limiting surface (91), the loose end limiting surface limits the rotation angle of the rotating block away from the brake block. 5. A high-voltage live wire tight protector according to claim 4, characterized in that the limit block is also provided with a tight-end limit surface (92), and the tight-end limit face brakes the approaching of the rotating block The rotation angle of the block is limited. 6. A high-voltage live wire tight protector according to claim 5, wherein the limit block is located directly below the rotating block, and the lower end surface of the rotating block is a plane extending along the left and right directions; The end limit surface is located on one side of the upper end of the limit block near the brake block, and the loose end limit surface is located on the other side; the limit block is pinned in the fixed box by the limit block pin (10), and the limit block The pin shaft hole (11) of bearing pin is the oblong hole that runs through the thickness direction of the fixed box, and the extension direction of the oblong hole is the up-down direction. 7. A high voltage live wire tight protector according to claim 6, characterized in that the limiting surface of the tight end is a convex arc surface. 8. A high-voltage live wire tight protector according to claim 6, characterized in that, the limit surface of the loose end is a plane parallel to the lower end surface of the rotating block. 9. A high-voltage live wire tight protector according to claim 1 or 2, wherein the cable is closed around and the hook is fixed on the cable and cannot move axially along the cable ring. 10. A high-voltage live wire tight protector according to claim 1 or 2, wherein the cable is in the shape of a flat belt, and the width of the cable is adapted to the thickness of the rotating block.