CN115832935A - Double-push type tightening device for replacing strain single-chip insulator of ultra/extra-high voltage line - Google Patents

Abstract

The patent discloses a double-push type tightening device for replacing a strain single insulator of an ultra/extra-high voltage line, wherein two double-push type tighteners (1) are respectively connected to two ends of a front clamp (3) and a rear clamp (4) to form a rectangular frame structure; the double-push tightener (1) comprises a U-shaped horizontal bracket (101), a U-shaped vertical bracket (106) and a hydraulic cylinder, wherein the horizontal bracket (101) and the vertical bracket (106) are arranged in a crossed manner; a cylinder body (103) of the hydraulic cylinder is arranged in a U-shaped frame of the horizontal support (101), and the rear end face of the cylinder body (103) is fixedly connected to the bottom face of the U-shaped frame; the piston rod (102) is connected to the bottom surface of the U-shaped frame of the vertical support (106); the advantages are that: the U-shaped frame is used for transmitting the tightening force, so that the rigidity of the tightening mechanism is increased, and the safety performance is greatly improved; the two double-push tighteners are alternately tightened, the stress of the insulator is balanced, and the tightening process is reliable and stable; and the automatic operation is easy to realize.

Description

Replacing the double-push tightening device for tension single-piece insulators of EHV/UHV lines

technical field

This patent relates to a tool for replacing insulators of ultra/ultra-high voltage lines, in particular to a double-push type tightening device for replacing strain-resistant single-piece insulators of ultra/ultra-high voltage lines.

Background technique

In the long-term operation of transmission line insulators, individual insulators become bad insulators due to damage and deterioration, affecting the normal operation of transmission lines, and seriously causing large-scale power outages. It is a daily routine for power maintenance personnel to replace bad insulators on transmission lines Work. Insulator tightening fixtures are used to replace insulators on power transmission lines. The commonly used insulator tightening fixtures now include front clamps, rear clamps, adjustment screw and hydraulic tightener. The adjustment screw and hydraulic tightener are respectively connected to the front clamp and rear clamp. The two ends of the card form a frame structure. When in use, the front card and the rear card are respectively clamped and fixed on the insulators on both sides of the insulator to be replaced. After the insulator tightening fixture spans 4 to 6 insulators on the insulator string, first Quickly adjust the length of the screw, and then precisely control the telescopic length of the hydraulic telescopic rod of the hydraulic tightener to tighten the front and rear clamps on the insulator, so that the insulator to be replaced and the adjacent insulator are loosened, and then the required Replacement insulators for replacement.

However, as the voltage level of power transmission lines becomes higher and higher, the height of towers increases sharply, the insulation level of insulators increases, and the length of insulator strings becomes longer and longer. Most of the strain insulators for UHV transmission lines now use 420kN and 530kN , 550kN tonnage insulators, the weight of a single insulator reaches 17kg to 22k, and the length of some insulator strings is as high as ten meters. For this reason, the tools for replacing insulators are also being continuously improved, and robots have begun to be used for live replacement, which puts forward higher requirements for insulator replacement fixtures that can be used for robot operations.

Due to the length of the insulator string and the heavy weight of the insulator, the tension on the insulator string increases sharply, and the tightening force required when the insulator clamp is tightened when replacing the insulator is greatly increased. The tightening force is as high as ten tons. When tightening the front clamp and the rear clamp, the existing insulator replacement tool first performs a quick and rough adjustment on the size of the adjustment screw, so that the front clamp and the rear clamp are clamped on the insulation, and then through Precisely control the hydraulic tensioner to tighten gradually and slowly. For ultra-high voltage and ultra-high voltage lines with a large tightening force, the insulator is subjected to excessive force on one side, thereby fracturing the insulator and causing a safety accident; at the same time, the existing hydraulic tensioner The tensioner adopts a conventional piston hydraulic cylinder structure. The piston rod protrudes from the front end of the hydraulic cylinder and is directly connected to the end of the front card or the rear card. The rear end of the hydraulic cylinder is connected to the end of the rear card or the front card. The force is clamped on the piston rod, and due to the limited size of the piston rod, it is easy to cause breakage when the insulator tightening force is too large. Once the piston rod breaks or the hydraulic system fails, it will cause a safety accident.

Contents of the invention

The purpose of this patent is to design a double-push type tightening device for replacing the strain-resistant single-piece insulator of ultra/ultra-high voltage lines, and to improve the force structure of the hydraulic tightening device for replacing the insulator clamp. When the clamp is tightened, the insulator is stressed. Uniformity, thereby improving the safety of replacing the insulator jig, and providing a tool for replacing single-piece insulators suitable for use by robots.

The technical solution of this patent is to replace the double-push tightening device for the tension-resistant single-piece insulator of the super/ultra-high voltage line, including the front clamp, the rear clamp and the double-push tightener, and the two double-push tighteners are respectively connected to the front clamp. and the two ends of the back card form a rectangular frame structure; the double push tightener includes a U-shaped horizontal support, a U-shaped vertical support and a hydraulic cylinder, and the horizontal support and the vertical support are intersected. The side plates of the U-shaped frame are perpendicular to each other, and the bottom surface of the U-shaped frame of the horizontal support and the vertical support is opposite; the cylinder body of the hydraulic cylinder is placed in the U-shaped frame of the horizontal support, and the rear end surface of the cylinder body is fixedly connected to the U-shaped frame. the bottom surface of the bottom surface of the hydraulic cylinder; the piston rod of the hydraulic cylinder stretches out from the front end of the cylinder and is fixedly connected to the bottom surface of the U-shaped frame of the vertical support; the first oil inlet and outlet of the hydraulic cylinder and the second oil inlet and outlet wear Protrude through the oil pipe hole provided on the side plate of the horizontal support;

Further, the front end of the piston rod is threadedly connected to the bottom of the U-shaped frame of the vertical support, and the rear end of the cylinder is connected to the bottom of the U-shaped frame of the horizontal support by threaded connection or fixedly connected by welding ;

Further, the rear end of the cylinder is attached to the bottom surface of the U-shaped frame of the horizontal support, and the outer wall of the cylinder is fixedly connected to the upper and lower side plates of the U-shaped frame of the horizontal support by welding;

Further, connection holes for connecting the front card or the rear card are respectively provided on the side plates at the opening ends of the U-shaped frame of the horizontal support and the vertical support;

Further, the two ends of the double-push tightener are fixedly connected to the ends of the front card or the rear card by bolts;

Further, a joint is provided at the connection between one end of the double-push tightener and the front card or the rear card;

Further, the base material of the front clamp, the rear clamp and the double-push tightener is titanium alloy.

The advantages of this patent are:

1) The piston rod of the double-push tightener is placed in the U-shaped frame of the vertical support, and the tightening force is transmitted through the U-shaped frame. There is a U-shaped frame as the secondary protection, and the safety performance is greatly improved; at the same time, because the push-out force of the piston rod of the hydraulic cylinder is greater than the force of the piston rod retracted into the cylinder, the clamp is tightened when the piston rod is pushed out, and the clamp is loose when retracted, increasing the The tightening force of the hydraulic tightener;

2) Double-push tighteners are used at both ends of the front card and the rear card. When the front card and the rear card clamp the insulator and then tighten, the hydraulic tighteners on both sides can be tightened separately through the robot hydraulic system , the two double-push tighteners tighten alternately, which can ensure the insulator is evenly stressed, the tightening process is reliable and stable, and the insulator will not be partially fractured at the same time;

3) It is suitable for robots to automatically replace defective single-piece insulators at high altitudes, with simple structure, convenient control, and easy automatic operation.

Description of drawings

Figure 1: Schematic diagram of the structure of the double-push tightening device;

Figure 2: Front view of double-push tightener;

Figure 3: A-A sectional view in Figure 2;

Figure 4: Top view of double-push tightener;

Figure 5: Structural diagram of the hydraulic cylinder;

Among the figure: 1-double push tightener; 101-horizontal support; 102-piston rod; 103-cylinder body; 104-first oil inlet and outlet; 105-second oil inlet and outlet; -piston; 2-joint; 3-front card; 4-rear card.

Detailed ways

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

As shown in Figure 1, the double-push tightening device for replacing the strain-resistant single-piece insulator of ultra/ultra-high voltage lines described in this patent includes a front clamp 3, a rear clamp 4 and a double-push tightener 1, two double-push tighteners The device 1 is rigidly connected to the two ends of the front card 3 and the rear card 4 respectively by bolts to form a rectangular frame structure, which is used as a tool for replacing bad insulators for UHV or EHV transmission lines. Fixture) and rear clamp 4 (the insulator clamping fixture near the wire end) are respectively clamped on the positioning flanges of the bad insulator that needs to be replaced on the front end of the insulator string adjacent to the insulator and the second insulator steel cap adjacent to the rear end, Then adjust the length of the double-push tightener 1 at both ends of the front card 3 and the rear card 4 by controlling the robot hydraulic system. On the clamped insulator, the bad insulator that needs to be replaced is loose, and then the insulator is removed and replaced.

The front clamp 3 and the rear clamp 4 are universal insulator clamps. The front clamp 3 and the rear clamp 4 both include a main body and a loam cake. One end of the loam cake is hinged on the main body, and the other end is connected to the main body through a screw; A cylindrical cavity is formed between them, and an annular slot matching the positioning flange on the insulator steel cap is set in the cylindrical cavity; the front clip 3 and the rear clip 4 are clamped on the insulator steel cap through the annular slot for positioning The flange can be operated and controlled by the robot controller, and has automatic clamping and automatic locking functions; of course, the front clamp 3 and the rear clamp 4 can also be manually clamped on the positioning flange of the insulator steel cap.

As shown in Figures 2-4, the double-push tightener 1 includes a U-shaped horizontal support 101, a U-shaped vertical support 106 and a hydraulic cylinder, and the two side plates of the U-shaped frame of the horizontal support 101 are located in the horizontal direction and Parallel to each other, the two side plates of the U-shaped frame of the vertical support 106 are located in the vertical direction and parallel to each other, the horizontal support 101 and the vertical support 106 are intersected, the U-shaped frame side plates of the horizontal support 101 and the vertical support 106 are perpendicular to each other, and the horizontal support 101 and the bottom surface of the U-shaped groove of the vertical support 106 are relatively arranged; as shown in Figure 5, the hydraulic cylinder includes a cylinder body 103, a piston rod 102 and a piston 107, and the piston 107 is placed in the cylindrical inner cavity of the cylinder body 103, and the piston The piston rod 102 at the front end of the cylinder body 103 stretches out from the front end face of the cylinder body 103. The two ends of the piston 107 in the cylinder body 103 respectively form a first working chamber and a second working chamber. The first oil inlet and outlet 104 of a working chamber is connected with the second oil inlet and outlet 105 of the second working chamber.

The cylinder body 103 of hydraulic cylinder is placed in the U-shaped frame of described horizontal support 101, and the rear end face of cylinder body 103 is fixedly connected on the groove bottom surface of U-shaped frame; The bottom is connected by thread, and the rear end of the cylinder body 103 is fixedly connected with the bottom of the U-shaped frame of the horizontal support 101 by thread connection or by welding; The bottom surface of the groove of the U-shaped frame fits together to facilitate the transmission of the thrust of the cylinder body. The cylinder outer wall of the cylinder body 103 is fixedly connected to the upper side plate and the lower side plate of the U-shaped frame of the horizontal support 101 by welding respectively. The piston rod 102 of the hydraulic cylinder stretches out from the front end of the cylinder body 103 and is fixedly connected to the bottom surface of the U-shaped frame of the vertical support 106 by threads; The first oil inlet and outlet 104 and the second oil inlet and outlet 105 of the cylinder protrude through the above-mentioned oil pipe through hole. The first oil inlet and the second oil inlet and outlet are respectively connected to the oil circuit of the robot hydraulic control system.

The side plates of the U-shaped opening ends of the horizontal support 101 and the vertical support 106 are respectively provided with connecting holes for connecting the front card 3 or the rear card 4, for connecting the two ends of the double push tightener 1 with the front card 3 or the rear The ends of the card 4 are fixed and rigidly connected by bolts; since the axes of the connecting holes at the opening ends of the horizontal bracket 101 and the vertical bracket 106 of the double-push tightener 1 are perpendicular to each other, when connecting with the front card 3 and the rear card 4, it needs to be connected at one end. A joint 2 is provided, and the axes of the connection holes at both ends of the joint 2 are perpendicular to each other, which is used to change the direction of the connection holes to facilitate connection. In order to reduce the weight of replacing the double-push tightening device of the single-piece tension insulator of the EHV/UHV line and ensure sufficient strength, the base material of the front clamp 3, the rear clamp 4 and the double-push tightener 1 is titanium alloy. The double-push tightening device for replacing single-piece tension insulators of EHV/UHV lines is connected to the robot mobile platform through a horizontal bracket 101 or vertical bracket 106 of a double-push tightener 1, and is used for the robot to automatically complete insulator replacement. Of course, the double-push type tightening device for replacing the tension single-piece insulator of the EHV/UHV line described in this patent can also be used for manually replacing the insulator tool.

Claims (7)

1. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line is characterized in that: the device comprises a front clamp (3), a rear clamp (4) and two pushing tighteners (1), wherein the two pushing tighteners (1) are respectively connected with two ends of the front clamp (3) and the rear clamp (4) to form a rectangular frame structure; the double-push tightener (1) comprises a U-shaped horizontal support (101), a U-shaped vertical support (106) and a hydraulic cylinder, wherein the horizontal support (101) and the vertical support (106) are arranged in a crossed mode, U-shaped frame side plates of the horizontal support (101) and the vertical support (106) are perpendicular to each other, and the bottom surfaces of the U-shaped frames of the horizontal support (101) and the vertical support (106) are opposite; a cylinder body (103) of the hydraulic cylinder is arranged in a U-shaped frame of the horizontal support (101), and the rear end face of the cylinder body (103) is fixedly connected to the bottom face of the U-shaped frame; a piston rod (102) of the hydraulic cylinder extends out of the front end surface of the cylinder body (103) and then is fixedly connected to the bottom surface of the U-shaped frame of the vertical support (106); a first oil inlet and outlet (104) and a second oil inlet and outlet (105) of the hydraulic cylinder penetrate through oil pipe through holes formed in side plates of the horizontal support (101) to extend out.

2. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: the front end of the piston rod (102) is in threaded connection with the bottom of a U-shaped frame of the vertical support (106), and the rear end of the cylinder body (103) is fixedly connected with the bottom of the U-shaped frame of the horizontal support (101) in a threaded connection or welding mode.

3. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: the rear end of the cylinder body (103) is attached to the bottom surface of the U-shaped frame of the horizontal support (101), and the outer side wall of the cylinder body (103) is fixedly connected with the upper side plate and the lower side plate of the U-shaped frame of the horizontal support (101) in a welding mode.

4. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: and the side plates of the opening ends of the U-shaped frames of the horizontal bracket (101) and the vertical bracket (106) are respectively provided with a connecting hole for connecting the front card (3) or the rear card (4).

5. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: and the two ends of the double-push tightener (1) are fixedly connected with the end parts of the front clamp (3) or the rear clamp (4) through bolts.

6. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: a joint (2) is arranged at the joint of one end of the double-push tightener (1) and the front card (3) or the rear card (4).

7. The double-push type tightening device for replacing the strain single insulator of the ultra/extra-high voltage line as claimed in claim 1, which is characterized in that: the base materials of the front clamp (3), the rear clamp (4) and the double-push tightener (1) are titanium alloy.

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