A closed fixture that reduces insulator replacement time

Abstract

The present invention discloses a closed-type fixture that can reduce insulator replacement time. The fixture comprises: a clamping structure for clamping the insulator, the clamping structure comprising an annular bracket, a tensioning rope, a winding shaft, and a plurality of telescopic plates. The plurality of telescopic plates are circumferentially arranged along the inner sidewall of the annular bracket, the telescopic plates being radially slidably connected to the annular bracket, a tensioning rope disposed outside the plurality of telescopic plates and in close contact with the outer sidewalls of the telescopic plates, one end of the tensioning rope being fixed to the annular bracket, and the other end of the tensioning rope being fixed to the winding shaft, which is connected to the annular bracket; and a tensioning structure for tightening two clamping structures to relax the insulator located between the two clamping structures, the ends of the tensioning structure being hingedly connected to the two clamping structures. The present invention provides a closed-type fixture that can reduce insulator replacement time. The fixture can be adapted to insulators of different diameters, thus avoiding significant time waste due to an inappropriate fixture.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment maintenance tools, and in particular to a closed clamp capable of reducing insulator replacement time. Background Art

[0002] Glass insulators are commonly used components in power transmission facilities. When a glass insulator in a tension tower explodes and needs to be replaced, a closed clamp is commonly used. The front and rear clamps of the closed clamp are positioned on the steel caps of the insulator to be replaced, located at the appropriate positions in front and behind it. Tightening the lead screw transfers the load from the insulator to the closed clamp. This method has the advantage of requiring only one person on the tower, reducing maintenance steps and saving time and physical effort. However, due to the large number of insulator manufacturers in China, the steel caps of the same model vary in size across different manufacturers and batches, leading to the possibility of mismatches between the insulator model and the closed clamp on site.

[0003] The closed clamps in the existing technology are affected by the different models and sizes of insulators. Before using the closed clamps, it is necessary to first confirm the diameter of the insulator steel cap and then select the corresponding closed clamp mold for operation. Therefore, the process of checking the mold size is added during maintenance; in addition, due to the influence of the processing technology, the insulator steel cap is not a perfect circle or the diameter does not meet the design requirements. Therefore, multiple sets of closed clamps need to be prepared at the work site for adaptation, and even a matching situation may occur, which seriously affects the progress of the maintenance work and even leads to failure to complete on time. The traditional closed-type clamp method for replacing insulators is mainly divided into the following steps: a) Before replacing the glass insulator, the closed-type clamp is hoisted to the designated position by the transfer rope and installed in place. The replacement of the clamp due to an unsuitable clamp is time-consuming. After the appropriate clamp is in place, the closed-type clamp screw is tightened to relax the insulator string. The spring pin connecting the replaced insulator ball head and the lower bowl head is first removed, and then the spring pin connecting the replaced insulator bowl head and the upper ball head is removed; b) The insulator is removed and transferred to the bottom of the pole with the transfer rope, and the new insulator is lifted and installed; c) After the new insulator is installed, the spring pin connecting the new insulator bowl head and the upper ball head is installed, and then the spring pin connecting the new insulator bowl head and the lower bowl head is installed; d) The closed-type clamp screw is loosened to make the insulator string stressed, the conductor returns to its original position, and the clamp is removed and recycled. Therefore, it is necessary to design an insulator closed clamp with adjustable inner diameter, which can adapt to insulators of different diameters and avoid a lot of time wasted during the replacement process due to an inappropriate clamp. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art in the insulator replacement process, which exist in that the on-site insulator model does not match the closed clamp, seriously affecting the progress of the maintenance work and even causing the work to be completed on time, the present invention provides a closed clamp that can reduce the insulator replacement time and can be adapted to insulators of different diameters, avoiding a large amount of time wasted due to an unsuitable clamp.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A closed fixture capable of reducing insulator replacement time, comprising:

[0007] A clamping structure for clamping the insulator includes an annular bracket, a tensioning rope, a winding shaft, and a plurality of telescopic plates. The plurality of telescopic plates are circumferentially arranged along the inner side wall of the annular bracket. The telescopic plates are radially slidably connected to the annular bracket. The tensioning rope is arranged on the outer side of the plurality of telescopic plates and is in close contact with the outer side wall of the telescopic plates. One end of the tensioning rope is fixed to the annular bracket, and the other end of the tensioning rope is fixed to the winding shaft. The winding shaft is connected to the annular bracket.

[0008] The tensioning structure is used to tighten the two clamping structures so that the insulator located between the two clamping structures is in a relaxed state. The two ends of the tensioning structure are respectively hinged to the two clamping structures.

[0009] In the above technical solution, the tensioning rope is a steel wire rope. The telescopic plate can slide radially along the annular bracket, thereby adjusting the inner diameter of the clamping structure to adapt it to insulators of different diameters, avoiding the significant time wasted due to inappropriate clamping. Furthermore, by using the tensioning rope and winding shaft structure, multiple telescopic plates can be simultaneously slid inward and locked by simply rotating a single winding shaft. Compared to solutions that require individually sliding and locking each telescopic plate inward, this solution can further improve overall replacement efficiency. The process of replacing insulators using the above-mentioned closed clamp is as follows: before replacing the glass insulator, the closed clamp is hoisted to the specified position through the transfer rope, the position of the telescopic plate is adjusted by the winding shaft to make the closed clamp fit the insulator, the tensioning structure of the closed clamp is tightened, and after the insulator string is relaxed, the spring pin connecting the ball head of the replaced insulator and the lower bowl head is first removed, and then the spring pin connecting the bowl head of the replaced insulator and the upper ball head is removed; the insulator is removed, and transferred to the bottom of the pole with the transfer rope, the new insulator is lifted and installed; after the new insulator is installed, the spring pin connecting the bowl head of the new insulator and the upper ball head is installed, and then the spring pin connecting the ball head of the new insulator and the lower bowl head is installed; the tensioning structure of the closed clamp is relaxed to make the insulator string stressed, the conductor returns to its original position, and the closed clamp is removed and recycled.

[0010] Preferably, the winding shaft includes a rotating shaft, a sliding shaft and a retraction spring. The rotating shaft is rotatably connected to the annular bracket, the sliding shaft is slidably connected to the rotating shaft along the axial direction of the rotating shaft, and the retraction spring makes the rotating shaft and the sliding shaft approach each other. One end of the retraction spring is connected to the rotating shaft, and the other end of the retraction spring is connected to the sliding shaft. A locking shaft is fixed on the sliding shaft; a plurality of locking holes are arranged circumferentially along the axis of the rotating shaft on the annular bracket, the locking shaft is adapted to the locking hole, and one end of the tensioning rope is fixed to the rotating shaft.

[0011] The sliding shaft drives the rotating shaft to rotate. To adjust the position of the telescopic plate, simply pull the sliding shaft to one side to disengage the locking shaft from the locking hole. Then, rotate the sliding shaft to rotate the rotating shaft together, tightening or loosening the tension rope. Once adjusted to the desired position, insert the locking shaft into the nearest locking hole and lock it.

[0012] Preferably, the rotating shaft is provided with a through hole for passing the tension rope. Said structure facilitates fixing the tension rope on the rotating shaft.

[0013] Preferably, a receiving groove for receiving a tensioning rope is provided on the upper side wall of the rotating shaft. Said structure facilitates winding of the tensioning rope around the rotating shaft.

[0014] Preferably, a groove is provided on the outer side wall of the telescopic plate, and the tensioning rope is arranged in the groove. Said structure can prevent the tensioning rope from slipping off.

[0015] Preferably, the distance from the position where the tensioning rope is fixed to the annular bracket to the center of the annular bracket is smaller than the distance from the position where the tensioning rope contacts the telescopic plate to the center of the annular bracket. Said structure can ensure that the tensioning rope can tighten the telescopic plate inward.

[0016] Preferably, the annular bracket comprises a base frame and a movable frame, which form a complete annular structure. One end of the movable frame is hinged to the base frame, and the other end of the movable frame is bolted to the base frame. One end of the tensioning rope is fixed to the movable frame, and the winding shaft is disposed on the base frame. This structure enables an openable design for the annular bracket, facilitating the attachment of the clamp to the insulator. Furthermore, the opening of the annular bracket coincides with the opening of the tensioning rope, ensuring that the tensioning rope does not interfere with the attachment of the clamp to the insulator.

[0017] Preferably, the annular bracket is provided with a plurality of telescopic springs, with at least one spring corresponding to each telescopic plate. One end of the telescopic spring is connected to the annular bracket, and the other end of the telescopic spring is connected to the corresponding telescopic plate. The telescopic springs maintain a tendency for the telescopic plates to move outward. This structure allows the telescopic plates to move outward when the tightening bolts are loosened, eliminating the need to manually pull the telescopic plates outward.

[0018] The beneficial effects of the present invention are as follows: (1) the inner diameter of the closed clamp can be adjusted and can be adapted to insulators of different diameters, thereby avoiding a large amount of time wasted due to an unsuitable clamp; (2) by means of the tensioning rope and the winding shaft structure, a plurality of telescopic plates can be simultaneously slid inward and locked by rotating only one winding shaft. Compared with the solution of sliding and locking each telescopic plate individually inward, this solution can further improve the overall replacement efficiency; (3) the openable design of the annular bracket can be realized, which facilitates the clamp to be put on the insulator, and the opening of the annular bracket just coincides with the opening of the tensioning rope, and the tensioning rope will not affect the clamp being put on the insulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural diagram of the clamping structure;

[0021] Figure 3 It is a structural diagram of the winding shaft.

[0022] In the figure: clamping structure 1, annular bracket 1.1, basic frame 1.1.1, movable frame 1.1.2, annular groove 1.1.3, locking hole 1.1.4, tensioning rope 1.2, winding shaft 1.3, rotating shaft 1.3.1, sliding shaft 1.3.2, retraction spring 1.3.3, through hole 1.3.4, accommodating groove 1.3.5, locking shaft 1.3.6, telescopic plate 1.4, groove 1.4.1, long groove 1.4.2, tensioning structure 2, operating rod 2.1, wire sleeve 2.2, screw rod 2.3, telescopic spring 3, guide shaft 4. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] like Figure 1 As shown, a closed clamp that can reduce the time of replacing insulators includes: a clamping structure 1 and a tensioning structure 2; Figure 2 As shown, the clamping structure 1 includes an annular bracket 1.1, a tensioning rope 1.2, a winding shaft 1.3 and several telescopic plates 1.4. An annular groove 1.1.3 is provided on the inner side wall of the annular bracket 1.1. Several telescopic plates 1.4 are arranged circumferentially along the annular groove 1.1.3. The telescopic plates 1.4 are connected to the annular bracket 1.1 in a radial sliding manner. A long groove 1.4.2 is provided on the telescopic plate 1.4. The length direction of the long groove 1.4.2 is parallel to the sliding direction of the telescopic plate 1.4. A guide shaft 4 is fixed on the annular bracket 1.1, and the guide shaft 4 passes through the long groove 1.4.2.

[0026] like Figure 2As shown, the tensioning rope 1.2 is arranged outside a plurality of telescopic plates 1.4 and is in close contact with the outer wall of the telescopic plates 1.4. A groove 1.4.1 is provided on the outer wall of the telescopic plates 1.4, and the tensioning rope 1.2 is arranged in the groove 1.4.1. One end of the tensioning rope 1.2 is fixed to the annular bracket 1.1, and the other end of the tensioning rope 1.2 is fixed to the winding shaft 1.3. The distance from the position where the tensioning rope 1.2 is fixed to the annular bracket 1.1 to the center of the annular bracket 1.1 is less than the distance from the position where the tensioning rope 1.2 contacts the telescopic plates 1.4 to the center of the annular bracket 1.1. Figure 3 As shown, the winding shaft 1.3 includes a rotating shaft 1.3.1, a sliding shaft 1.3.2 and a retraction spring 1.3.3. The rotating shaft 1.3.1 is rotatably connected to the annular bracket 1.1, the sliding shaft 1.3.2 is slidably connected to the rotating shaft 1.3.1 along the axial direction of the rotating shaft 1.3.1, and the retraction spring 1.3.3 makes the rotating shaft 1.3.1 and the sliding shaft 1.3.2 approach each other. One end of the retraction spring 1.3.3 is connected to the rotating shaft 1.3.1, and the other end of the retraction spring 1.3.3 is connected to the sliding shaft 1.3.2. A locking shaft 1.3.6 is fixed on the sliding shaft 1.3.2; a plurality of locking holes 1.1.4 are arranged on the annular bracket 1.1 along the circumference of the axis of the rotating shaft 1.3.1, the locking shaft 1.3.6 is adapted to the locking hole 1.1.4, and one end of the tensioning rope 1.2 is fixed to the rotating shaft 1.3.1. The rotating shaft 1.3.1 is provided with a through hole 1.3.4 for passing the tension rope 1.2. The upper side wall of the rotating shaft 1.3.1 is provided with a receiving groove 1.3.5 for receiving the tension rope 1.2.

[0027] like Figure 2 As shown, the annular support 1.1 comprises a base frame 1.1.1 and a movable frame 1.1.2, which form a complete annular structure. One end of the movable frame 1.1.2 is hinged to the base frame 1.1.1, and the other end of the movable frame 1.1.2 is bolted to the base frame 1.1.1. One end of the tension rope 1.2 is fixed to the movable frame 1.1.2, and the winding shaft 1.3 is mounted on the base frame 1.1.1. The annular support 1.1 is provided with a plurality of telescopic springs 3, with at least one telescopic spring 3 corresponding to each telescopic plate 1.4. One end of the telescopic spring 3 is connected to the annular support 1.1, and the other end of the telescopic spring 3 is connected to the corresponding telescopic plate 1.4. The telescopic spring 3 maintains the tendency of the telescopic plate 1.4 to move outward.

[0028] The tensioning structure 2 is used to tighten the two clamping structures 1, so that the insulator located between the two clamping structures 1 is in a relaxed state. The two ends of the tensioning structure 2 are respectively hinged to the two clamping structures 1. There are two tensioning structures 2, each of which includes an operating rod 2.1, a threaded sleeve 2.2, and two screw rods 2.3. The two screw rods 2.3 are respectively hinged to the annular brackets 1.1 of the two clamping structures 1. One end of the screw rod 2.3 is threadedly connected to the threaded sleeve 2.2, and the threads of the two screw rods 2.3 are in opposite directions. The operating rod 2.1 is connected to the threaded sleeve 2.2.

[0029] In the above technical solution, the tensioning rope 1.2 is a steel wire rope. The telescopic plate 1.4 can slide radially along the annular bracket 1.1, thereby adjusting the inner diameter of the clamping structure 1 to adapt it to insulators of different diameters, avoiding the significant time wasted due to inappropriate clamping. Furthermore, through the structure of the tensioning rope 1.2 and the winding shaft 1.3, multiple telescopic plates 1.4 can be simultaneously slid inward and locked by simply rotating one winding shaft 1.3. Compared to solutions that require individually sliding and locking each telescopic plate 1.4 inward, this solution can further improve overall replacement efficiency. The process of replacing insulators using the above-mentioned closed clamp is as follows: before replacing the glass insulator, the closed clamp is hoisted to the specified position through the transfer rope, the position of the telescopic plate 1.4 is adjusted by the winding shaft 1.3 to make the closed clamp fit the insulator, the tensioning structure 2 of the closed clamp is tightened, and after the insulator string is relaxed, the spring pin connecting the ball head of the replaced insulator and the lower bowl head is first removed, and then the spring pin connecting the bowl head of the replaced insulator and the upper ball head is removed; the insulator is removed, and transferred to the bottom of the pole with the transfer rope, the new insulator is lifted and installed; after the new insulator is installed, the spring pin connecting the bowl head of the new insulator and the upper ball head is installed, and then the spring pin connecting the ball head of the new insulator and the lower bowl head is installed; the tensioning structure 2 of the closed clamp is loosened to make the insulator string stressed, the conductor returns to its original position, and the closed clamp is removed and recycled.

[0030] The beneficial effects of the present invention are as follows: (1) the inner diameter of the closed clamp can be adjusted and can be adapted to insulators of different diameters, thereby avoiding a large amount of time wasted due to an unsuitable clamp; (2) through the structure of the tensioning rope 1.2 and the winding shaft 1.3, a plurality of telescopic plates 1.4 can be simultaneously slid inwardly and locked by rotating only one winding shaft 1.3. Compared with the solution of sliding and locking each telescopic plate 1.4 individually, this solution can further improve the overall replacement efficiency; (3) the openable design of the annular bracket 1.1 can be realized, which facilitates the clamp to be put on the insulator, and the opening of the annular bracket 1.1 just coincides with the opening of the tensioning rope 1.2, and the tensioning rope 1.2 will not affect the clamp being put on the insulator.

Claims

1. A closed fixture that can reduce the time of insulator replacement, characterized by: include: A clamping structure for clamping the insulator includes an annular bracket, a tensioning rope, a winding shaft, and a plurality of telescopic plates. The plurality of telescopic plates are circumferentially arranged along the inner side wall of the annular bracket. The telescopic plates are radially slidably connected to the annular bracket. The tensioning rope is arranged on the outer side of the plurality of telescopic plates and is in close contact with the outer side wall of the telescopic plates. One end of the tensioning rope is fixed to the annular bracket, and the other end of the tensioning rope is fixed to the winding shaft. The winding shaft is connected to the annular bracket. A tensioning structure is used to tighten the two clamping structures so that the insulator located between the two clamping structures is in a relaxed state, and both ends of the tensioning structure are hinged to the two clamping structures respectively; The winding shaft includes a rotating shaft, a sliding shaft and a retraction spring. The rotating shaft is rotatably connected to the annular bracket, and the sliding shaft is slidably connected to the rotating shaft along the axial direction of the rotating shaft. One end of the retraction spring is connected to the rotating shaft, and the other end is connected to the sliding shaft. A locking shaft is fixed on the sliding shaft; a plurality of locking holes are arranged on the annular bracket along the circumference of the axis of the rotating shaft, the locking shaft is adapted to the locking hole, and one end of the tensioning rope is fixed to the rotating shaft.

2. A closed fixture capable of reducing insulator replacement time according to claim 1, characterized in that: The retraction spring brings the rotating shaft and the sliding shaft closer to each other.

3. A closed fixture capable of reducing insulator replacement time according to claim 2, characterized in that: The rotating shaft is provided with a through hole for passing the tensioning rope.

4. The closed fixture capable of reducing insulator replacement time according to claim 2, characterized in that: An accommodating groove for accommodating a tensioning rope is provided on the upper side wall of the rotating shaft.

5. A closed fixture capable of reducing insulator replacement time according to claim 1, 2, 3 or 4, characterized in that: A groove is provided on the outer side wall of the telescopic plate, and the tensioning rope is arranged in the groove.

6. The closed fixture capable of reducing insulator replacement time according to claim 5, characterized in that: The distance between the position where the tensioning rope is fixed to the annular bracket and the center of the annular bracket is smaller than the distance between the position where the tensioning rope contacts the telescopic plate and the center of the annular bracket.

7. A closed fixture capable of reducing insulator replacement time according to claim 1, 2, 3 or 4, characterized in that: The annular bracket includes a basic frame and a movable frame, which form a complete annular structure. One end of the movable frame is hinged to the basic frame, and the other end of the movable frame is connected to the basic frame by bolts. One end of the tensioning rope is fixed on the movable frame, and the winding shaft is set on the basic frame.

8. A closed-type fixture capable of reducing insulator replacement time according to claim 1, 2, 3 or 4, characterized in that: The annular bracket is provided with a plurality of telescopic springs, one telescopic plate corresponds to at least one telescopic spring, one end of the telescopic spring is connected to the annular bracket, and the other end of the telescopic spring is connected to the corresponding telescopic plate. The telescopic spring enables the telescopic plate to maintain a tendency to move outward.

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