Transformer on-load tap changer hoisting tool convenient to quickly assemble

Abstract

The invention discloses a hoisting tool for an on-load tap changer of a transformer. The hoisting tool comprises a base, a vertical supporting rod, a hoisting arm, a fixed pulley, a take-up and pay-off motor, a winding roller, a traction rope, a hoisting hook, a positioning pin connecting mechanism, an extension plate, a balancing weight, an auxiliary supporting rod and a fixed disc. The positioning pin is used for fastening and positioning a hoisting hole in the top of a transformer body, and the extension plate increases the contact area. And a distance sensor is arranged at the lifting hook to guarantee safety. The hoisting method is clear in steps. The tool can be quickly assembled, is accurate in positioning, stable in connection, convenient and flexible to operate, high in safety performance and good in balance adjustment, can solve the problems of high cost, large space requirement and the like of an existing hoisting mode, is suitable for maintenance of the on-load tap changer of the transformer and the like, and improves the working efficiency and the safety.

Description

Technical Field

[0001] The invention relates to the technical field of electric power maintenance equipment, and in particular to a transformer on-load voltage regulating switch hoisting tool which is convenient for rapid assembly. Background Art

[0002] An on-load voltage-changing tap-changer is a voltage-changing device suitable for operation under transformer excitation or load, used to change the connection position of transformer winding tapping. The structure of an on-load voltage-changing tap-changer can be divided into three parts, namely, the switching switch, the tap selector, and the operating mechanism. In order to avoid carbonization of the oil in the transformer oil chamber and insulation degradation and burning of the arc contact, the switch oil change and the switching switch maintenance must be carried out according to a certain operating cycle, the number of switching actions or the oil quality test results. The weight of the on-load voltage-changing tap-changer ranges from tens of kilograms to 300 kilograms. The lifting work cannot be completed by manpower. At present, the on-load voltage-changing switch is generally hoisted and repaired by a truck crane or a crane at a maintenance base. However, whether it is a crane or a crane, the size is relatively large and the cost of use is high; at the same time, the internal space of the substation is small, and the truck crane is often parked on the road inside the station. During maintenance, the boom needs to be extended a certain distance, and there is a possibility of accidentally touching the operating equipment and causing a power outage.

[0003] At present, the lifting and maintenance of on-load tap-changing switches in substations have the following problems: 1. During on-site maintenance of substations, only truck cranes can be used for lifting, which requires drivers with corresponding qualifications; 2. The space requirements for substations are high. If the space requirements are not met, power outages are required; 3. Regardless of whether a truck crane or a mobile crane is used, the maintenance cost is high and the maintenance time is long; 4. The control scope is large, which brings greater safety pressure to the work site. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a transformer on-load tap changer lifting tool that is easy to assemble quickly, and adopts the following technical solutions:

[0005] The lifting of the lifting gear is improved by the present invention. The lifting gear of the lifting gear is improved by the strength of the lifting gear, and the strength of the lifting gear is improved by the strength of the lifting gear.

[0006] Furthermore, the positioning pin connection mechanism includes a positioning pin and a corresponding pin hole. The positioning end is provided with a conical head so as to be inserted into the lifting hole on the top of the transformer body. The vertical support rod adopts a hollow steel pipe. The pin hole is arranged at the bottom of the vertical support rod and the diameter is adapted to the positioning pin. When the base contacts the top of the transformer body, the pin hole and the lifting hole remain horizontal.

[0007] Furthermore, a distance sensor is provided at the lifting hook for monitoring the real-time distance between the lifting hook and the boom. When the distance to the boom exceeds a set range, the distance sensor is immediately interlocked to stop the operation of the retractable wire motor.

[0008] Furthermore, the retractable wire motor is a DC reduction motor.

[0009] Furthermore, the counterweight is a lead block.

[0010] On the other hand, the present invention also provides a method for hoisting the hoisting tool, comprising the following steps:

[0011] S1, move the base to the top of the transformer body, align the bottom of the vertical support rod with the lifting hole on the top of the transformer body, lower the base so that the lifting hole is inserted into the bottom of the vertical support rod, when the base contacts the top of the transformer body, the pin hole and the lifting hole are kept horizontal, and then insert the positioning pin into the pin hole and pass through the lifting hole on the top of the transformer body;

[0012] S2, wind the traction rope neatly on the winding roller and connect it with the hook and winding roller reliably;

[0013] S3, installing the auxiliary support rod fixing plate in the middle of the boom, and connecting the auxiliary support rod with the fixing plate and the counterweight;

[0014] S4, lower the lifting hook and hook the switch, start the retractable wire motor to reverse and lower the hook to the switch lifting point, lift the on-load voltage-regulating switch, start the retractable wire motor to rotate forward to lift the switch, move and position the on-load voltage-regulating switch, lift the switch and move it above the predetermined position, and slowly lower it to place it accurately at the designated position.

[0015] Furthermore, in S4, when the vertical distance between the lifting hook and the boom exceeds the set range, the distance sensor is interlocked to stop the operation of the retractable and retractable wire motor.

[0016] Through the above technical solution, the present invention uses the positioning pin connection mechanism, the base can be quickly positioned and fastened to the top of the transformer body, the connection method of each component is simple and reasonable, and the overall assembly time is significantly shortened, which has outstanding advantages in emergency repair scenarios. The positioning pin connection mechanism ensures that the base is reliably connected to the transformer, and the connection of each component is strengthened to withstand the weight of the hoisting and external force impact, ensuring the safety of the operation.

[0017] The distance sensor at the lifting hook monitors the distance between the hook and the boom in real time. When the distance exceeds the range, the motor is immediately interlocked and stopped to prevent collision damage. In addition, multiple safety measures such as the traction rope overload protection device, the hook anti-unhooking device, and the warning signs at prominent positions of the lifting tools and the guardrails around the boom effectively reduce the probability of safety accidents and ensure all-round operation safety.

[0018] The counterweight block and the auxiliary support rod work together to accurately adjust the balance, reduce the shaking and tilting of the boom, control the tilt angle within a small range, improve stability, and extend the life of the equipment. The extension plate of the base is integrally formed with the bottom plate, which effectively increases the contact area with the top of the transformer body, makes the force on the base more uniform, and further improves the stability and reliability of the entire lifting tool during work, providing a solid foundation for safe and efficient lifting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of this embodiment;

[0020] Figure 2 Schematic diagram of the positioning pin connection mechanism in this embodiment.

[0021] Among them: 1. Transformer body; 2. Base; 3. Winding roller; 4. Retracting and unwinding motor; 5. Vertical support rod; 6. Lifting arm; 7. Auxiliary support rod fixing plate; 8. Auxiliary support rod; 9. Counterweight; 10. Fixed pulley; 11. Distance sensor; 12. Lifting hole; 13. Pin hole; 14. Lifting hook; 15. Positioning pin; 16. Extension plate. DETAILED DESCRIPTION

[0022] Hereinafter, the technology in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0023] Reference Figure 1 , Figure 2 The present embodiment provides a transformer on-load tap changer lifting tool that is easy to assemble quickly, including a base 2 placed on the top of the transformer body 1, a vertical support rod 5 is fixed on the base 2, the top of the vertical support rod 5 is fixedly connected to the boom 1, a fixed pulley 10 is provided at the front end of the boom 1, a retractable motor 4 and a winding roller 3 are provided on the vertical support rod 5, the winding roller 3 is connected to the output shaft of the retractable motor 4, a traction rope is wound around the winding roller 3, one end of the traction rope is fixed to the winding roller 3, and the other end passes through the fixed pulley 10 and is fixed with a lifting hook 14. A positioning pin connection mechanism is provided at the center of the base 2, which is used to be tightly fixed with the lifting hole 12 at the top of the transformer body 1, an integrally formed extension plate 16 is provided at one end of the base 2 facing the boom 6, a counterweight block 9 is fixed at the other end of the extension plate 16, an auxiliary support rod 8 is hinged at the upper end of the counterweight block 9, an auxiliary support rod fixing plate 7 is movably connected to the top end of the auxiliary support rod 8, and the auxiliary support rod fixing plate 7 is detachably fixed to the middle of the boom 6.

[0024] Specifically, the positioning pin connection mechanism includes a positioning pin 15 and a corresponding pin hole 13. One end of the positioning pin 15 has a conical head for easy insertion into the top hanging hole 12 of the transformer body 1. The vertical support rod 5 is a hollow steel pipe. The pin hole 13 is arranged at the bottom of the vertical support rod 5 and is adapted to the positioning pin 15. When the base 2 contacts the top of the transformer body 1, the pin hole 13 and the hanging hole 12 remain horizontal. Figure 2 The positioning pin 15 is inserted into the pin hole 13 at the bottom of the vertical support rod 5. When the base 2 contacts the top of the transformer body 1, the positioning pin 15 is inserted into the lifting hole 12. The base 2 is clamped with the lifting hole 12, and the gap between the positioning pin 15 and the pin hole 13 is 0.1-0.2mm.

[0025] Specifically, a distance sensor 11 is provided at the lifting hook 14 for monitoring the real-time distance between the lifting hook and the boom. When the distance exceeds a set range, the distance sensor 11 is immediately interlocked to stop the operation of the retractable and retractable wire motor 4.

[0026] Specifically, the retractable wire motor 4 is a DC reduction motor, and the counterweight block 9 is a lead block.

[0027] Working principle of this embodiment:

[0028] When the base 2 is carried to the top of the transformer body 1, the base 2 is lowered by aligning the bottom of the vertical support rod 5 with the lifting hole 12 at the top of the transformer body 1 and lowering the base 2 so that the lifting hole 12 is inserted into the bottom of the vertical support rod 5. At this time, due to the design of the positioning pin connection mechanism, the conical head of the positioning pin 15 can slide smoothly along the inner wall of the lifting hole 12 under the action of gravity, guiding the positioning pin 15 to insert into the pin hole 13 and pass through the lifting hole 12 at the top of the transformer body 1. When the base 2 is in full contact with the top of the transformer body 1 and the pin hole 13 is kept horizontal with the lifting hole 12, the positioning pin 15 is accurately in place and clamped on the edge of the base 2 or the transformer body 1, thereby realizing the rapid positioning and fastening of the base 2 on the top of the transformer body 1. This design utilizes the precise matching between the positioning pin 15, the pin hole 13 and the lifting hole 12, ensures the accuracy and stability of the installation of the base 2, and provides a reliable basic support for the entire lifting tool.

[0029] Start the retractable motor 4, and the rotation of its output shaft drives the winding roller 3 to rotate through the transmission connection. When the lifting hook 14 needs to be lowered, the retractable motor 4 reverses, and the winding roller 3 releases the traction rope. After the traction rope changes direction through the fixed pulley 10, it drives the lifting hook 14 to descend. By controlling the reversal speed of the retractable motor 4, the operator can accurately control the descending speed of the hook 14, so that it slowly approaches the lifting point of the on-load voltage regulating switch. When the hook 14 reaches the appropriate position, it is firmly connected to the switch, for example, by connecting it to the lifting ring of the switch through the hook device on the hook 14, or fixing it with bolts and other connecting parts.

[0030] Then start the retractable motor 4 to rotate forward, the winding roller 3 starts to reel in the traction rope, the tension of the traction rope gradually increases, overcomes the gravity of the on-load voltage regulator, and lifts it smoothly. During the lifting process, according to the weight and characteristics of the switch, the operator can adjust the speed of the retractable motor 4 to control the appropriate lifting speed, generally between 0.05-0.15m / s, to ensure a smooth and safe lifting process. At the same time, the fixed pulley 10 rotates flexibly at the front end of the boom 6, effectively changing the direction of the traction rope, reducing the friction resistance between the traction rope and other components, and making the lifting process smoother.

[0031] When the on-load voltage regulating switch is hoisted to a certain height, the switch is moved to the upper part of the predetermined working position by moving the hoisting tool (such as pushing the base 2 or rotating the arm 6) or adjusting the angle of the arm 6 (which can be operated by auxiliary equipment or manpower). During the movement, the hoisting speed is kept stable, and operations such as emergency stop and sudden turn are avoided to prevent the switch from shaking or colliding. Finally, the switch is slowly lowered to be accurately placed on the designated working platform or installation position to complete the hoisting operation.

[0032] During the hoisting process, when the weight and position of the on-load voltage regulator change and cause the boom 6 to be unbalanced, the balance adjustment structure starts to work. The counterweight block 9 always tends to remain vertically downward due to gravity. When the boom 6 tilts to one side, the auxiliary support rod 8 on that side will be subjected to greater tension or pressure (depending on the tilting direction).

[0033] The hinge between the auxiliary support rod 8 and the counterweight 9 allows the auxiliary support rod 8 to rotate around the hinge point at a certain angle, while the active connection (such as a ball joint connection) between the top end of the auxiliary support rod 8 and the auxiliary support rod fixing plate 7 allows it to freely adjust its direction and angle within a certain range. In this case, the auxiliary support rod 8 will automatically adjust its angle under the action of the gravity of the counterweight 9, changing the direction and size of its supporting force on the boom 6.

[0034] For example, if the boom 6 tilts to the left, the left auxiliary support rod 8 is subjected to greater pressure, and it will rotate counterclockwise around the hinge point with the counterweight 9. At the same time, the top is adjusted at the ball joint connection of the auxiliary support rod fixing plate 7, so that the support force of the left auxiliary support rod 8 on the boom 6 is offset to the lower left, generating a counterclockwise torque, which interacts with the clockwise torque generated by the unbalanced load. The tension on the right auxiliary support rod 8 increases, and it will rotate clockwise around the hinge point. Its support force is offset to the upper right, generating a smaller clockwise torque to assist in balance. In this way, the synergistic effect of the auxiliary support rods 8 on both sides reasonably distributes the gravity of the counterweight 9, generates a torque opposite to the unbalanced load, restores the balance of the boom 6, and ensures the stability of the lifting operation.

[0035] The distance sensor 11 at the lifting hook 14 monitors the distance between the hook 14 and the boom 6 in real time. When the vertical distance between the hook 14 and the boom 6 exceeds the set range (0.1 meters to the length of the traction rope that can be released) during the rising or falling process, the distance sensor 11 will immediately detect this change and transmit the signal to the control system. After receiving the signal, the control system will interlock and stop the operation of the retractable motor 4 in a very short time (0.1-0.5 seconds) to prevent the hook 14 from continuing to move and causing the load switch to collide. This safety protection mechanism is based on the high-precision measurement and fast signal transmission of the distance sensor 11, as well as the reliable interlocking response of the control system, which effectively avoids possible safety accidents such as hook damage, traction rope breakage, component deformation, etc., and ensures the safety of the lifting operation.

[0036] The hoisting method of this embodiment includes the following steps:

[0037] S1, move the base 2 to the top of the transformer body 1, align the bottom of the vertical support rod 5 with the lifting hole 12 on the top of the transformer body 1, lower the base 2 so that the lifting hole 12 is inserted into the bottom of the vertical support rod 5, when the base 2 contacts the top of the transformer body 1, the pin hole 13 and the lifting hole 12 are kept horizontal, and then the positioning pin 15 is inserted into the pin hole 13 and passes through the lifting hole 12 on the top of the transformer body;

[0038] S2, the traction rope is neatly wound on the winding roller 3 and is reliably connected to the hook 14 and the winding roller 3;

[0039] S3, install the auxiliary support rod fixing plate 7 in the middle of the boom 6, and connect the auxiliary support rod 8 with the auxiliary support rod fixing plate 7 and the counterweight 9;

[0040] S4, lower the lifting hook 14 and hook the switch, start the retractable wire motor 4 to reverse and make the lifting hook 14 descend to the lifting point of the on-load voltage regulating switch, lift the on-load voltage regulating switch, start the retractable wire motor 4 to rotate forward to lift the switch, move and position the on-load voltage regulating switch, lift the switch and move it above the predetermined position, and slowly lower it to place it accurately at the designated position.

[0041] Specifically, in S4, when the vertical distance between the lifting hook 14 and the boom 6 exceeds the set range, the distance sensor 11 is interlocked to stop the operation of the retractable and retractable motor 4.

Claims

1. A transformer on-load tap changer lifting tool that is easy to assemble quickly, characterized in that: The yoke is provided with a cam which is fixed to the top of the base and is secured to the base with a camming lever which is secured to the bottom of the base and to the camming lever on the other end of the base.

2. A transformer on-load tap changer lifting tool that is easy to assemble quickly according to claim 1, characterized in that: The positioning pin connection mechanism includes a positioning pin and a corresponding pin hole. A conical head is provided at one end of the positioning pin so as to be inserted into the lifting hole at the top of the transformer body. The vertical support rod adopts a hollow steel pipe. The pin hole is arranged at the bottom of the vertical support rod and its diameter is adapted to the positioning pin. When the base contacts the top of the transformer body, the pin hole and the lifting hole remain horizontal.

3. The transformer on-load tap changer lifting tool that is easy to assemble quickly according to claim 1 is characterized in that: A distance sensor is installed at the lifting hook to monitor the real-time distance between the lifting hook and the boom. When the distance to the boom exceeds the set range, the distance sensor will immediately interlock and stop the operation of the retractable and retractable wire motor.

4. The transformer on-load tap changer lifting tool that is easy to assemble quickly according to claim 1 is characterized in that: The retractable wire motor is a DC reduction motor.

5. The transformer on-load tap changer lifting tool that is easy to assemble quickly according to claim 1, characterized in that: The counterweight is a lead block.

6. A method for hoisting a transformer on-load tap changer hoisting tool that is easy to assemble quickly according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, move the base to the top of the transformer body, align the bottom of the vertical support rod with the lifting hole on the top of the transformer body, lower the base so that the lifting hole is inserted into the bottom of the vertical support rod, when the base contacts the top of the transformer body, the pin hole and the lifting hole are kept horizontal, and then insert the positioning pin into the pin hole and pass through the lifting hole on the top of the transformer body; S2, wind the traction rope neatly on the winding roller and connect it with the hook and winding roller reliably; S3, installing the auxiliary support rod fixing plate in the middle of the boom, and connecting the auxiliary support rod with the fixing plate and the counterweight; S4, lower the lifting hook and hook the switch, start the retractable wire motor to reverse and lower the hook to the switch lifting point, lift the on-load voltage-regulating switch, start the retractable wire motor to rotate forward to lift the switch, move and position the on-load voltage-regulating switch, lift the switch and move it above the predetermined position, and slowly lower it to place it accurately at the designated position.

7. The hoisting method according to claim 6, characterized in that: In the above S4, when the vertical distance between the lifting hook and the boom exceeds the set range, the distance sensor is interlocked to stop the operation of the retractable and retractable wire motor.

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