Power transmission line insulator chain installation and transmission tackle and use method of power transmission line insulator chain installation and transmission tackle

Abstract

The invention relates to the field of high-voltage power transmission line maintenance facilities, in particular to a power transmission line insulator chain installation and transmission tackle and a using method thereof.The power transmission line insulator chain installation and transmission tackle comprises a length-adjustable tackle frame, the tackle frame comprises a fixed frame, a movable frame and two lead screws which are distributed in a rectangular mode, and a connecting assembly in threaded fit with the lead screws is arranged in the movable frame; the connecting assembly comprises a containing frame fixed in the movable frame, semicircular positioning pieces with opposite openings are arranged in the containing frame, the two positioning pieces form a nut which is in threaded fit with the lead screw, and the two half edges of the nut can be separated. The length-adjustable pulley frame structure is adopted, and the threaded fit between the nut and the lead screw can be relieved during coarse adjustment, so that the movable frame can slide freely; during fine adjustment, worm and gear transmission is utilized to drive the lead screw to rotate, accurate adjustment is achieved, the adaptation efficiency of insulator strings with different lengths is improved, the hanging point position of the tackle rope can be changed, the problem that disassembly and assembly are difficult due to drooping of the middle section of the insulator string is solved, and accurate butt joint in the disassembly and assembly process is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-voltage transmission line maintenance facilities, specifically to a transmission line insulator string installation transfer trolley and its usage method. Background Technology

[0002] High-voltage transmission towers play a crucial role in power transmission systems, and insulator strings are key components for achieving electrical insulation on these towers. Typically composed of multiple individual insulators connected in series, they ensure the insulation performance between the transmission line and the tower, guaranteeing safe and stable power transmission. During long-term operation, insulator strings are affected by various factors, such as air pollution, where dust, salt, and other pollutants adhere to the insulator surface, forming a contamination layer that can easily cause flashover in humid weather, and powerful lightning currents can damage the insulators. Furthermore, the tension of the transmission line and external forces such as wind place long-term mechanical loads on the insulators. Additionally, the aging of the materials themselves gradually degrades the insulation performance over time. These factors can lead to damage to individual insulators or the expiration of the entire insulator's service life, necessitating the replacement of damaged or expired insulator strings.

[0003] Furthermore, because the insulator strings of high-voltage lines are flexible structures suspended at both ends, they exhibit a concave arc shape in the middle when naturally suspended. This structural characteristic means that when removing the insulator strings from the mounting components of the transmission tower, the connection points between the hardware at both ends and the mounting components remain compressed due to the downward pull of the insulator strings themselves. Moreover, the insulator strings are typically quite heavy, especially long strings, and the downward pull generated by their gravity makes it difficult for workers to manually lift and separate the connections, posing a significant obstacle to the replacement work and often requiring substantial manpower and time.

[0004] Existing pulley structures for insulator string assembly and disassembly are incompatible with corresponding tensioning clamps. Due to the sag in the middle section of the insulator string, the stress distribution is uneven during assembly and disassembly. The tension of the insulator string is mainly concentrated at both ends, while the tension in the middle section is lower due to the sag. This uneven stress further increases the difficulty of separating the end fittings from the installation components, making assembly and disassembly operations difficult. Simultaneously, the sag in the middle section also leads to uncertainty in the spatial position of the insulator string, making it difficult to accurately align or separate it from the installation components of the transmission tower. Furthermore, existing pulleys are inconvenient when used for adjusting the size of insulator strings of different lengths. Specifically, in actual maintenance, personnel usually need to climb to the location of the insulator to be replaced on the transmission tower to view and determine the required length. Current length adjustments, which mostly rely on bolt-on / off adjustment structures, require specialized tools, making them cumbersome to use. Summary of the Invention

[0005] The purpose of this invention is to provide a transmission line insulator string installation transfer trolley and its usage method to solve the above-mentioned problems. It employs an adjustable-length trolley frame structure. For coarse adjustment, the threaded engagement between the nut and the lead screw can be released, allowing the movable frame to slide freely. For fine adjustment, a worm gear drive is used to rotate the lead screw, achieving precise adjustment and improving the adaptability efficiency of insulator strings of different lengths. Furthermore, the pulley assembly can be moved laterally by the adjusting rod to change the suspension point of the trolley rope, thereby adjusting the relative position of the insulator end fittings and the transmission tower installation components. This solves the positional uncertainty problem caused by mid-section sagging and ensures precise connection during assembly and disassembly, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a transmission line insulator string installation transfer trolley, including a trolley frame with adjustable length. The trolley frame includes a rectangularly distributed fixed frame, a movable frame and two lead rods. One end of the lead rod is rotatably disposed on one side of the fixed frame and the other end of the lead rod passes through the movable frame. The movable frame is provided with a threaded connection assembly for the lead rod. The connecting assembly includes a receiving frame fixed inside the movable frame. Inside the receiving frame, there are semi-circular ring-shaped positioning members with opposite openings. The two positioning members form a threaded screw with two separable halves. A connecting rod with the two ends connected to the two positioning members is inserted into the outside of the receiving frame. A support edge is provided on the outer side of the end of the connecting rod. A compression spring is provided on the support edge to press against the inner wall of the receiving frame to keep the opening of the positioning member pressed.

[0007] Preferably, the receiving frame is provided with a constraint seat, which is a C-shaped bent plate structure with the opening facing the positioning member, and the constraint seat extends to the outside of the positioning member to keep the two halves of the nut tightly abutting. The opening side of the constraint seat extends outward to form a support plate, and the two sets of support plates are distributed in a figure-eight shape.

[0008] Preferably, the support plate extends to the outside of the support edge, and a vertical through-hole relief groove is provided on the outer opening side of the support plate. The end of the connecting rod passes into the relief groove and is clearance-fitted with the relief groove. Control rods for extending movable frames are fixed on the outer sides of the two sets of constraint seats.

[0009] Preferably, the fixing frame has two bushings inside corresponding to the lead screw. The fixing frame has a rotating hole through the outside to accommodate the rotation of the bushings. A drive disk is fixed at the end of the bushing away from the lead screw. A transmission disk that is connected to the drive disk is provided at the end of the lead screw that passes through the bushing to keep the bushing and the lead screw rotating synchronously. A worm gear is coaxially fixed on the outside of the middle section of the bushing.

[0010] Preferably, the fixed frame has a longitudinally extending drive shaft in the middle, and the front and rear ends of the fixed frame are provided with rotating plates to support the rotation of the drive shaft. Both ends of the drive shaft are provided with worm gears that cooperate with worm gear transmission. The drive shaft has a lower gear in the middle, and the top side of the fixed frame is provided with an operating component that drives the lower gear.

[0011] Preferably, the top of the fixed frame is vertically fixed with a limiting seat to accommodate the insertion of an operating component. The operating component includes an auxiliary cylinder that extends vertically into the fixed frame and rotatably engages with the limiting seat. The bottom end of the auxiliary cylinder is fixed with an upper gear that meshes with a lower gear. Inside the auxiliary cylinder, there is a core rod extending upwards. The top of the core rod is fixed with a knob. The top of the limiting seat is surrounded by multiple slots. The outside of the auxiliary cylinder has multiple vertically extending grooves. The bottom end of the core rod is fixed with a chuck. The outer circumference of the chuck is fixed with multiple pins that extend out of the grooves and engage with the grooves. The pins can slide vertically within the grooves to disengage from them, thereby unlocking the rotational locking state of the auxiliary cylinder. Inside the auxiliary cylinder, there is a spring that presses downwards against the chuck to keep the pins pressed into the grooves.

[0012] Preferably, the fixed frame and the movable frame are each fixed with two laterally extending guide components on opposite sides. The bottom of each guide component is provided with a pulley assembly that can move laterally. The ends of the two pulley ropes passing through the two sets of pulley assemblies on the same side are connected to a set of clamps, and the outer end of the guide component is fixed with a reinforcing seat.

[0013] Preferably, the guide assembly includes a laterally extending guide rail, an adjusting rod is provided inside the guide rail, and rotating ears supporting the rotation of the adjusting rod are provided at both ends of the guide rail. A pulley and a turntable are fixed to the outer end of the adjusting rod. A synchronous belt drives the two sets of pulleys on the same side. The pulley assembly includes a combination frame disposed below the guide rail. A guide block that slides with the guide rail is fixed to the top side of the combination frame, and a fixed pulley supporting the trolley rope is provided on the bottom side of the combination frame.

[0014] Preferably, the clamp includes a fixed clamping plate and a movable clamping plate with arc-shaped openings at the top and bottom facing each other. The fixed clamping plate has two sets of lifting lugs at both ends for connecting the pulley rope. One end of the movable clamping plate is hinged to the fixed clamping plate, and the other end is provided with a connecting bolt for detachably connecting to the fixed clamping plate.

[0015] The method for using the transmission line insulator string installation transfer pulley includes the following steps: a. When disassembling and installing insulators, adjust the length of the trolley frame according to the required insulator length to ensure it matches the insulator size. Pull the control rod towards the original fixed frame direction to extend the movable frame section. Use both ends of the control rod to pull the two sets of constraint seats away from the positioning parts to disengage the constraint seats from the outside of the positioning parts. This releases the constraint effect of the constraint seats on the closed nut of the two sets of positioning parts. Then, continue to pull the control rod outward to pull the support plate at the external opening of the constraint seat to the position of pressing against the support edge. Then, the inclined expansion support plate pushes the support rod to drive the connecting rod and positioning parts to expand outward. At the same time, the compression spring is compressed by the push of the support edge to realize the active separation of the two positioning parts of the nut. At this time, the threaded engagement between the nut and the screw is released, and the movable frame and its external accessories can slide and adjust freely in the length direction of the screw to realize the quick and rough adjustment of the distance between the movable frame and the fixed frame. b. After the position of the movable frame is coarsely adjusted, release the control lever and push it back to its original position. At this time, the compression spring releases its elasticity to push the support rod to drive the connecting rod to support the two sets of positioning parts to reset and tighten again, forming the threaded screw nut structure. At the same time, the constraint seat moves to be sleeved on the outside of the screw nut, keeping the screw nut in a tight position locked. At this time, pull the knob upward to move the core rod and chuck upward, disengaging the locking pin from the slot. Then, by rotating the knob, the auxiliary cylinder and upper gear rotate, which in turn drives the transmission shaft to rotate. The worm gear mechanism drives the two bushings to support the screw to rotate synchronously, so as to achieve precise fine adjustment of the lateral position of the movable frame and its accessories by utilizing the threaded engagement between the screw and the screw nut in the movable frame. c. After adjusting the spacing between the fixed frame and the movable frame to match the required length of the insulator to be disassembled and assembled, install the fixed frame and the movable frame onto the mounting components at both ends of the insulator on the transmission tower, and fix the two sets of clamps to both ends of the insulator. Then, pull the four pulley ropes at both ends to pull the clamps to support the insulator and straighten and tighten it as a whole under the support of the fixed pulley. This ensures that the end fittings of the insulator are pulled close to the mounting components of the transmission tower. The clamps are pulled by the pulley ropes to resist the weight of the insulator, and the pulley assembly bears the suspension tension during the installation of the insulator. d. When it is necessary to adjust the position of the insulator end, the adjusting rod is rotated by rotating the turntable, and the two adjusting rods at the same end are rotated synchronously by the synchronous belt. The threaded engagement between the adjusting rod and the guide block drives the guide block to move laterally, thereby changing the lateral position of the pulley assembly. By changing the suspension point of the fixed pulley on the pulley rope, the relative position of the insulator end mounting hardware and the transmission tower mounting components is adjusted.

[0016] The beneficial effects are as follows: 1. The movable frame of the present invention can move along the lead screw. By adjusting its relative position with the fixed frame, the length of the trolley frame can be changed, thereby allowing the trolley to adapt to insulator strings of different lengths. At the same time, the positioning parts in the connecting assembly can form separable nut, which, in conjunction with the lead screw, enables the movable frame to move quickly. When coarsely adjusting the distance between the movable frame and the fixed frame, the control rod pulls the constraint seat to separate the positioning parts, and the threaded engagement between the nut and the lead screw is released. The movable frame can then slide quickly along the lead screw, enabling a rapid and rough adjustment of the trolley frame length to meet the need for quick adaptation to the approximate length of the insulator string. During fine adjustment, the control rod is released to reset the constraint seat. The two positioning parts abut against each other to reassemble the nut and engage with the lead screw thread. The rotation of the lead screw is used to precisely adjust the position of the movable frame, ensuring that the length of the trolley frame is precisely matched with the length of the insulator string, thus guaranteeing the accuracy of subsequent assembly and disassembly operations.

[0017] 2. The worm gears at both ends of the drive shaft and the worm wheels on the inner bushing of the fixed frame form a worm gear transmission pair. The worm gear transmission has self-locking properties, which can prevent the trolley frame from moving on its own due to external forces after adjustment, ensuring the stability of the frame length. At the same time, an auxiliary cylinder is set as the main structure of the operating component, and the internal core rod can move up and down. A locking pin is set on the chuck at the bottom of the core rod. The locking pin extends out of the vertical groove on the auxiliary cylinder and can cooperate with the locking groove of the limit seat. When the locking pin is engaged in the locking groove, the auxiliary cylinder is locked and cannot rotate, further ensuring the stability of the trolley frame after the length is adjusted. 3. When the position of the movable frame needs to be adjusted, pull the core rod upward to disengage the locking pin from the slot, and the auxiliary cylinder can rotate freely, thereby driving the upper gear, transmission shaft and other components to move, so as to realize the adjustment of the trolley frame. By setting a quick locking and unlocking structure, the operator can easily control the adjustment state of the trolley frame, and the double self-locking structure provides two layers of protection to avoid the frame length change caused by misoperation during the replacement of insulator strings. 4. The guide rail serves as the transverse moving track for the pulley assembly. It has an internal adjusting rod that is threadedly engaged with the guide block inside the guide rail. During use, by rotating the adjusting rod, the guide block can be driven to move along the guide rail, thereby actively changing the suspension point of the pulley rope. This adjusts the relative position of the insulator end mounting hardware and the transmission tower mounting components, solving the problem of position uncertainty caused by the sagging of the middle section of the insulator string, and making the disassembly and assembly operations easier to align. 5. The four pulley ropes are respectively connected to two sets of pulley assemblies and a set of clamps on the same side. By pulling the pulley ropes, the clamps can be pulled under the support of the fixed pulleys, so that the insulator string is straightened and tightened as a whole to resist the weight of the insulator and keep the end fittings of the insulator close to the transmission tower installation components. At the same time, the pulley assembly is used to bear the suspension tension during the installation of the insulator, reducing the workload of the operators. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a structural breakdown diagram of the present invention; Figure 4 This is a schematic diagram showing the overall structure of the present invention broken down; Figure 5 This is a structural breakdown diagram of the connecting component of the present invention; Figure 6 This is a structural disassembly diagram of the fixing frame of the present invention; Figure 7 This is a structural breakdown diagram of the operating component of the present invention; Figure 8 This is a structural breakdown diagram of the guide component of the present invention; Figure 9 This is a structural disassembly diagram of the clamp of the present invention; Figure 10 This is a three-dimensional structural schematic diagram of another aspect of the present invention.

[0020] The annotations in the attached figures are explained as follows: 1. Fixed frame; 101. Rotating hole; 102. Limiting seat; 102a. Slot; 103. Bushing; 104. Worm gear; 105. Drive plate; 2. Movable frame; 201. Retaining sleeve; 3. Lead screw; 301. Transmission plate; 4. Connecting assembly; 401. Receiving frame; 402. Positioning element; 403. Connecting rod; 404. Support edge; 405. Compression spring; 406. Constraint seat; 407. Support plate; 408. Relief groove; 409. Control lever; 5. Transmission shaft; 501. Lower gear; 502. Worm gear; 6. Rotating plate; 7. Operating element; 7 01. Auxiliary cylinder; 701a. Vertical groove; 702. Core rod; 703. Upper gear; 704. Chuck; 704a. Locking pin; 705. Spring; 706. Knob; 8. Guide assembly; 801. Guide rail; 801a. Rotating ear; 802. Adjusting rod; 803. Turntable; 804. Pulley; 9. Pulley assembly; 901. Combination frame; 902. Guide block; 903. Fixed pulley; 10. Clamp; 10a. Fixed clamping plate; 10b. Movable clamping plate; 10c. Connecting bolt; 11. Pulley rope; 12. Synchronous belt; 13. Reinforcing seat. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] See Figures 1-10As shown, the present invention provides a transmission line insulator string installation and transfer trolley, including an adjustable length trolley frame. The trolley frame includes a rectangularly distributed fixed frame 1, a movable frame 2, and two lead rods 3. One end of the lead rod 3 is rotatably mounted on one side of the fixed frame 1, and the other end of the lead rod 3 passes through the movable frame 2. The movable frame 2 is provided with a threaded connection assembly 4 that engages with the lead rod 3, which is used to realize the precise movement of the movable frame 2 along the lead rod 3 through threaded transmission, thereby adjusting the distance between the fixed frame 1 and the movable frame 2 to adapt to insulator strings of different lengths. The connecting assembly 4 includes a receiving frame 401 fixed inside the movable frame 2. Inside the receiving frame 401 are two opposing semi-circular annular positioning members 402. The two positioning members 402 form a threaded engagement with the lead screw 3, with both halves separable. In the closed state, they form a threaded engagement with the lead screw 3, providing a transmission basis for the movement of the movable frame 2. In the separated state, the threaded connection with the lead screw 3 is released, enabling rapid sliding adjustment of the movable frame 2. A connecting rod 403, with its two ends connected to the two positioning members 402 respectively, passes through the outside of the receiving frame 401. Two sets of positioning components 402 are connected synchronously to ensure that the positioning components 402 move in unison during opening and closing, avoiding misalignment caused by unilateral deviation. A support edge 404 is provided on the outer side of the end of the connecting rod 403. A compression spring 405 is provided on the support edge 404 to press against the inner wall of the receiving frame 401 to keep the positioning component 402 closed and pressed. The spring force is continuously applied to the support edge 404 toward the inner wall of the receiving frame 401 and transmitted to the positioning component 402 through the connecting rod 403, so that the two positioning components 402 always remain closed and pressed, ensuring the stability of the threaded engagement between the nut and the screw 3.

[0026] As an optional implementation, a constraint seat 406 is provided inside the receiving frame 401. The constraint seat 406 is a C-shaped bent plate structure with its opening facing the positioning member 402. The constraint seat 406 extends to the outside of the positioning member 402 to keep the two halves of the nut tightly abutting. It is used to provide additional wrapping constraint from the outside of the positioning member 402 to prevent the positioning member 402 from separating when subjected to the transmission force of the lead screw 3, and further enhance the reliability of the fit between the nut and the lead screw 3. The opening side of the constraint seat 406 extends outward to form a support plate 407. The two sets of support plates 407 are distributed in a figure-eight shape to form an outward support force through the inclined structure. When the constraint seat 406 is pulled, the inclined effect is used to push the support edge 404, thereby driving the positioning member 402 to separate, reducing the operating force requirement. With this configuration, the double constraint of the constraint seat 406 and the force-saving transmission of the support plate 407 can simultaneously ensure the stability of the nut fit and the ease of separation. The support plate 407 extends to the outside of the support edge 404, and a vertical through-type relief groove 408 is provided on the outer opening side of the support plate 407. The end of the connecting rod 403 passes into the relief groove 408 and is clearance-fitted with the relief groove 408, thereby providing a space for the end of the connecting rod 403 to move, avoiding interference between the support plate 407 and the connecting rod 403 when the support plate 407 moves, and ensuring that the movements of the constraint seat 406 and the positioning member 402 do not affect each other. Control rods 409 extending from the movable frame 2 are fixed on the outside of the two sets of constraint seats 406, which are used to provide an external force application point for the operator. By pulling or pushing the control rods 409, the movement of the constraint seat 406 is realized, thereby controlling the opening and closing state of the positioning member 402. With this setting, the external operation of the connecting component 4 can be conveniently realized, and the state of the nut can be adjusted without disassembling the movable frame 2, adapting to the space constraints of high-altitude operations. The fixed frame 1 has two bushings 103 inside corresponding to the lead screw 3. The outer side of the fixed frame 1 has a rotating hole 101 to accommodate the rotation of the bushings 103. The end of the bushing 103 away from the lead screw 3 is fixed with a drive disk 105. The end of the lead screw 3 that passes through the bushing 103 is provided with a transmission disk 301 that is connected to the drive disk 105 to keep the bushing 103 and the lead screw 3 rotating synchronously. Specifically, a worm gear 104 is coaxially fixed to the outer side of the middle section of the bushing 103. With this configuration, the rotational power of the worm gear 104 can be transmitted to the lead screw 3 through the bushing 103. At the same time, the bushing 103 provides radial support for the lead screw 3 to prevent the lead screw 3 from radially deviating during rotation and to ensure transmission accuracy. A longitudinally extending drive shaft 5 is provided in the middle of the fixed frame 1, and rotating plates 6 are provided at both the front and rear ends of the fixed frame 1 to support the rotation of the drive shaft 5. These plates provide stable rotational support for the drive shaft 5, limit the axial and radial displacement of the drive shaft 5, and ensure that the worms 502 and worm wheels 104 at both ends of the drive shaft 5 are always precisely meshed. Both ends of the drive shaft 5 are provided with worms 502 that cooperate with the worm wheels 104 for transmission. A lower gear 501 is provided in the middle of the drive shaft 5. An operating component 7 that drives the lower gear 501 is provided on the top side of the fixed frame 1. This component 7 is used to drive the lower gear 501 to rotate, thereby driving the drive shaft 5 to rotate synchronously. This causes the worms 502 at both ends to drive the worm wheels 104 to rotate simultaneously, achieving synchronous adjustment of the two lead screws 3 and preventing the movable frame 2 from shifting. This configuration allows the operator to control the overall adjustment of the trolley frame through a single operating point, improving operating efficiency and adjustment accuracy. A limiting seat 102 is vertically fixed at the top of the fixed frame 1 to accommodate the insertion of the operating component 7. The operating component 7 includes an auxiliary cylinder 701 that extends vertically into the fixed frame 1 and rotatably engages with the limiting seat 102. An upper gear 703 that meshes with a lower gear 501 is fixed at the bottom of the auxiliary cylinder 701 to transmit the rotational power of the auxiliary cylinder 701 to the lower gear 501, forming a transmission connection between the operating component 7 and the transmission shaft 5. A core rod 702 extending upward is provided inside the auxiliary cylinder 701, and a knob 706 is fixed at the top of the core rod 702. Multiple slots 102a are arranged around the top of the limiting seat 102, and multiple vertically extending grooves 701a penetrate the outside of the auxiliary cylinder 701. 2. A chuck 704 is fixed at the bottom. Multiple locking pins 704a are fixed on the outer circumference of the chuck 704, which extend out of the vertical groove 701a and engage with the groove 102a. The locking pins 704a can slide vertically in the vertical groove 701a to disengage from the groove 102a, thereby unlocking the rotation lock state of the auxiliary cylinder 701. A spring 705 is provided in the auxiliary cylinder 701 to press down against the chuck 704 and keep the locking pins 704a pressed into the groove 102a. It is used to continuously apply a downward elastic force to the chuck 704, so that the locking pins 704a always remain engaged with the groove 102a, preventing the auxiliary cylinder 701 from rotating on its own when not in operation, and ensuring the dimensional stability of the trolley frame after adjustment. Two laterally extending guide components 8 are fixed on opposite sides of the fixed frame 1 and the movable frame 2. Each guide component 8 has a laterally movable pulley assembly 9 at its bottom. The guide components 8 provide a lateral movement track for the pulley assembly 9, allowing the pulley assembly 9 to be adjusted in a fixed direction, thereby changing the suspension point of the trolley rope 11. The ends of the two trolley ropes 11 inserted into the two sets of pulley assemblies 9 on the same side are connected to a set of clamps 10, which are used to transmit tension through the trolley ropes 11. The clamps 10 work together to form a stable lifting force on the insulator string, counteracting the downward force generated by the insulator's own weight. A reinforcing seat 13 is fixed to the outer end of the guide component 8 to enhance the structural strength of the end of the guide component 8, prevent the guide component 8 from deforming or breaking when subjected to the tension of the trolley rope 11, and extend the service life of the equipment. The guide assembly 8 includes a laterally extending guide rail 801, inside which an adjusting rod 802 is disposed. Both ends of the guide rail 801 are provided with rotating lugs 801a to support the rotation of the adjusting rod 802, providing rotational support for the adjusting rod 802, ensuring the stability of the adjusting rod 802's axis during rotation, and preventing transmission jamming caused by the adjusting rod 802's offset. A pulley 804 and a turntable 803 are fixed to the outer end of the adjusting rod 802. A synchronous belt 12 is connected between two sets of pulleys 804 on the same side. The pulley assembly 9 includes... The combination frame 901 below the guide rail 801 is used to integrate the guide block 902 and the fixed pulley 903 to form a unified moving unit, ensuring that the movement of each component of the pulley assembly 9 is synchronized. The top side of the combination frame 901 is fixed with the guide block 902 that slides with the guide rail 801, and the bottom side of the combination frame 901 is provided with a fixed pulley 903 that supports the trolley rope 11. The fixed pulley 903 is used to change the force direction of the trolley rope 11, reduce the friction loss between the trolley rope 11 and the combination frame 901, and at the same time make the tension of the trolley rope 11 more smoothly transmitted to the clamp 10. The clamp 10 includes a fixed clamping plate 10a and a movable clamping plate 10b, which are arc-shaped and have opposite upper and lower openings. The fixed clamping plate 10a has two sets of lifting lugs at both ends for connecting the pulley rope 11, which are used to achieve a stable connection between the pulley rope 11 and the clamp 10 and prevent the pulley rope 11 from falling off under tension. At the same time, the two sets of lifting lugs are symmetrically distributed to ensure that the clamp 10 is balanced under force. One end of the movable clamping plate 10b is hinged to the fixed clamping plate 10a, and the other end is provided with a connecting bolt 10c that can be detachably connected to the fixed clamping plate 10a. This is used to achieve quick opening and closing of the movable clamping plate 10b through the hinge structure. With the detachable design of the connecting bolt 10c, it is easy to quickly fix the clamp 10 to the end of the insulator or remove it from the insulator, which meets the convenience requirements of high-altitude operations. The method for using the transfer pulley for installing insulator strings on transmission lines includes the following steps: a. When disassembling and installing insulators, adjust the length of the trolley frame according to the required insulator length to ensure it matches the insulator size. Pull the control rod 409 towards the original fixed frame 1, extending the movable frame 2 section outwards. Use both ends of the control rod 409 to pull the two sets of constraint seats 406 away from the positioning member 402, thus disengaging the constraint seats 406 from the outside of the positioning member 402. This releases the constraint effect of the constraint seats 406 on the closed nut of the two sets of positioning members 402. Then continue pulling the control rod 409 outwards. 09. Pull the support plate 407 at the external opening of the constraint seat 406 to the position of abutting the support edge 404. Then, the inclined expansion support plate 407 pushes the support rod to drive the connecting rod 403 and the positioning part 402 to expand outward. At the same time, the compression spring 405 is compressed by the support edge 404, so as to realize the active separation of the two positioning parts 402 of the nut. At this time, the threaded engagement between the nut and the screw 3 is released, and the movable frame 2 and its external accessories can slide and adjust freely in the length direction of the screw 3, so as to realize the rapid and rough adjustment of the distance between the movable frame 2 and the fixed frame 1. b. After the position of the movable frame 2 is coarsely adjusted, release the control lever 409 and push it back to its original position. At this time, the compression spring 405 releases its elastic force to push the support rod and drive the connecting rod 403 to support the two sets of positioning parts 402 to reset and tighten again, forming the threaded engagement structure of the screw nut 3. At the same time, the constraint seat 406 moves to be sleeved on the outside of the screw nut, keeping the screw nut in a tight position locked. At this time, pull the knob 706 upward to drive the core rod 702 and chuck 704 to move upward, and disengage the locking pin 704a from the slot 102a. Then, by rotating the knob 706, the auxiliary cylinder 701 and the upper gear 703 are rotated, which in turn drives the transmission shaft 5 to rotate. The worm gear 104 and worm 502 mechanism drive the two bushings 103 to support the screw 3 to rotate synchronously. By utilizing the threaded engagement between the screw 3 and the screw nut in the movable frame 2, the lateral position of the movable frame 2 and its accessories can be precisely finely adjusted. c. After the distance between the fixed frame 1 and the movable frame 2 is adjusted to match the required length of the insulator to be disassembled and assembled, the fixed frame 1 and the movable frame 2 are respectively installed on the mounting components at both ends of the insulator on the transmission tower, and the two sets of clamps 10 are fixed to both ends of the insulator. Then, the four pulley ropes 11 at both ends are pulled to pull the clamps 10 under the support of the fixed pulley 903 to support the insulator as a whole to be straightened and tightened, so as to ensure that the end fittings of the insulator are pulled close to the mounting components of the transmission tower. The clamps 10 are pulled by the pulley ropes 11 to resist the self-weight of the insulator, so that the pulley assembly 9 can bear the suspension tension during the installation of the insulator. d. When it is necessary to adjust the position of the insulator end, the adjusting rod 802 is rotated by rotating the turntable 803, and the two adjusting rods 802 at the same end are ensured to rotate synchronously by the synchronous belt 12. The threaded engagement between the adjusting rod 802 and the guide block 902 drives the guide block 902 to move laterally, thereby changing the lateral position of the pulley assembly 9. By changing the suspension point of the fixed pulley 903 on the pulley rope 11, the relative position of the insulator end mounting hardware and the transmission tower mounting components is adjusted.

[0027] The movable frame 2 can move along the lead screw 3. By adjusting its relative position with the fixed frame 1, the length of the trolley frame can be changed, allowing the trolley to adapt to insulator strings of different lengths. At the same time, the positioning part 402 in the connecting assembly 4 can form a separable nut, which, in conjunction with the lead screw 3, enables the movable frame 2 to move quickly. When coarsely adjusting the distance between the movable frame 2 and the fixed frame 1, the control rod 409 pulls the constraint seat 406 to separate the positioning part 402, disengaging the threaded engagement between the nut and the lead screw 3. The movable frame 2 can then slide quickly along the lead screw 3, achieving a rapid and rough adjustment of the trolley frame length to meet the need for quick adaptation to the approximate length of the insulator string. During fine adjustment, the control rod 409 is released to reset the constraint seat 406. The two positioning parts 402 abut against each other to reassemble the nut and thread it into the lead screw 3. The rotation of the lead screw 3 is used to precisely adjust the position of the movable frame 2, ensuring a precise match between the trolley frame length and the insulator string length, guaranteeing the accuracy of subsequent assembly and disassembly operations.

[0028] The worm gears 502 at both ends of the drive shaft 5 and the worm wheel 104 on the inner bushing 103 of the fixed frame 1 form a worm wheel 104 worm gear 502 transmission pair. The worm wheel 104 worm gear 502 transmission has self-locking property, which can prevent the trolley frame from moving on its own due to external force after adjustment, and ensure the stability of the frame length. At the same time, the auxiliary cylinder 701 is set as the main structure of the operating component 7, and the internal core rod 702 can move up and down. A locking pin 704a is set on the chuck 704 at the bottom end of the core rod 702. The locking pin 704a extends out of the vertical groove 701a on the auxiliary cylinder 701 and can cooperate with the locking groove 102a of the limit seat 102. When the locking pin 704a is locked into the locking groove 102a, the auxiliary cylinder 701 is locked and cannot rotate, further ensuring the stability of the trolley frame after the length is adjusted. When the position of the movable frame 2 needs to be adjusted, pull the core rod 702 upward to disengage the locking pin 704a from the slot 102a, and the auxiliary cylinder 701 can rotate freely, thereby driving the upper gear 703, transmission shaft 5 and other components to move, thereby realizing the adjustment of the trolley frame. By setting a quick locking and unlocking structure, the operator can conveniently control the adjustment state of the trolley frame, and the double self-locking structure provides two layers of protection to avoid changes in the frame length due to misoperation during the replacement of the insulator string; The guide rail 801 serves as the transverse moving track of the pulley assembly 9. An adjusting rod 802 is installed inside the guide rail 801 and threadedly engages with the guide block 902 inside the guide rail 801. During use, by rotating the adjusting rod 802, the guide block 902 can be driven to move along the guide rail 801, thereby actively changing the suspension point of the trolley rope 11 to adjust the relative position of the insulator end mounting hardware and the transmission tower mounting components. This solves the problem of position uncertainty caused by the sag of the middle section of the insulator string, making the disassembly and assembly operations easier to align. Four pulley ropes 11 are respectively connected to two sets of pulley assemblies 9 and a set of clamps 10 on the same side. By pulling the pulley ropes 11, the clamps 10 can be pulled under the support of the fixed pulleys 903, so that the insulator string is straightened and tightened as a whole to resist the weight of the insulator and keep the end fittings of the insulator close to the transmission tower installation components. At the same time, the pulley assembly 9 is used to bear the suspension tension during the installation of the insulator, reducing the workload of the operators.

[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power line insulator string installation transfer trolley, characterized by: The length-adjustable trolley frame comprises a fixed frame (1), a movable frame (2) and two lead screws (3), one end of the lead screw (3) is rotatably arranged on one side of the fixed frame (1), and the other end of the lead screw (3) penetrates the movable frame (2), and the inside of the movable frame (2) is provided with a connecting assembly (4) which is threadedly connected with the lead screw (3); The connecting assembly (4) comprises a containing frame (401) fixed in the inside of the movable frame (2), the containing frame (401) is provided with two half-circular ring-shaped positioning members (402) with opposite openings in the inside, the two positioning members (402) form a threaded nut which is threadedly connected with the lead screw (3) and the two halves of which can be separated, the containing frame (401) is penetrated by a connecting rod (403) with two ends connected with the two positioning members (402) respectively, the end of the connecting rod (403) is provided with a supporting edge (404), and the supporting edge (404) is provided with a compression spring (405) abutting against the inner wall of the containing frame (401) to keep the opening of the positioning member (402) abutting.

2. The installation and transfer trolley for strings of power transmission line insulators according to claim 1, characterized in that: The inside of the containing frame (401) is provided with a constraint seat (406) which is a C-shaped bent plate structure with an opening facing the positioning member (402), and the constraint seat (406) extends to the outside of the positioning member (402) to keep the two halves of the threaded nut abutting, and the opening sides of the constraint seat (406) are outwardly inclined to form two support plates (407) which are arranged in a "8" shape.

3. The installation and transfer trolley for strings of power line insulators according to claim 2, characterized in that: The support plates (407) extend to the outside of the supporting edge (404), and the opening sides of the support plates (407) are provided with vertical through-type accommodation grooves (408), the end of the connecting rod (403) penetrates the accommodation grooves (408) and is in clearance fit with the accommodation grooves (408), and the outside of the two constraint seats (406) is fixed with a control rod (409) which extends out of the movable frame (2).

4. The transmission line insulator string installation transfer trolley of claim 3, wherein: The inside of the fixed frame (1) is provided with two shaft sleeves (103) corresponding to the lead screw (3), the fixed frame (1) is penetrated by a rotating hole (101) which accommodates the rotation of the shaft sleeve (103), one end of the shaft sleeve (103) away from the lead screw (3) is fixed with a driving disc (105), one end of the lead screw (3) penetrating the shaft sleeve (103) is provided with a transmission disc (301) which is in transmission connection with the driving disc (105) to keep the shaft sleeve (103) and the lead screw (3) in synchronous rotation, and the outside of the middle segment of the shaft sleeve (103) is coaxially fixed with a worm gear (104).

5. The transmission line insulator string installation transfer trolley of claim 4, wherein: The middle of the fixed frame (1) is provided with a longitudinally extending transmission shaft (5), and the front and rear ends of the fixed frame (1) are provided with rotating plates (6) supporting the rotation of the transmission shaft (5), the two ends of the transmission shaft (5) are provided with worm gears (502) in transmission with the worm gear (104), the middle of the transmission shaft (5) is provided with a lower gear (501), and the top side of the fixed frame (1) is provided with an operating member (7) in transmission with the lower gear (501).

6. The transmission line insulator string installation transfer trolley of claim 5, wherein: The fixed frame (1) top vertical fixed with containing operation piece (7) into the limit seat (102), the operation piece (7) includes vertical extension fixed frame (1) inside and rotation cooperation limit seat (102) auxiliary cylinder (701), the auxiliary cylinder (701) bottom fixed with meshing lower gear (501) upper gear (703), the auxiliary cylinder (701) inside is provided with the core rod (702) that goes out to the up, the core rod (702) top end fixed with knob (706), the limit seat (102) top is provided with multiple clamping slots (102a) around, the auxiliary cylinder (701) outside is penetrated by multiple vertical extension vertical groove (701a), and the core rod (702) bottom end is fixed with chuck (704), the chuck (704) outer circle is fixed with multiple extension vertical groove (701a) and the clamping slot (102a) of card joint adaptation card pin (704a), the card pin (704a) can be vertically slipped in vertical groove (701a) to be unlocked from the clamping slot (102a), so that the rotation locking state of auxiliary cylinder (701) is unlocked, the auxiliary cylinder (701) is provided with spring (705) that goes down and is pressed into the chuck (704) in turn, and the card pin (704a) is kept into the clamping slot (102a).

7. The transmission line insulator string installation transfer trolley of claim 6, wherein: The fixed frame (1) and the movable frame (2) opposite side are both fixed with two lateral extension guide assemblies (8), the guide assembly (8) bottom is provided with the pulley assembly (9) that can move laterally, two groups of pulley assemblies (9) in the same side are connected with a set of clamps (10) at the end of two pulley ropes (11) that are penetrated, and the guide assembly (8) outer end is fixed with reinforcing seat (13).

8. The transmission line insulator string installation transfer trolley of claim 7, wherein: The guide assembly (8) includes lateral extension guide rail (801), the guide rail (801) is provided with adjusting rod (802) inside, and the guide rail (801) both ends are provided with rotating ear (801a) that supports the rotation of adjusting rod (802), the adjusting rod (802) outer end is fixed with pulley (804) and turntable (803), two groups of pulleys (804) between the same side are transmissionally connected with synchronous belt (12), and the pulley assembly (9) includes combination frame (901) that is arranged below the guide rail (801), the combination frame (901) top side is fixed with guide block (902) that slides with the guide rail (801), the combination frame (901) bottom side is provided with fixed pulley (903) that supports pulley rope (11).

9. The transmission line insulator string installation transfer trolley of claim 8, wherein: The clamp (10) includes arc and upper and lower opening opposite fixed clamping plate (10a) and movable clamping plate (10b), the fixed clamping plate (10a) both ends are provided with two groups of hanging ears that are connected with pulley rope (11), and the movable clamping plate (10b) one end is hingedly connected with the fixed clamping plate (10a), and the other end is provided with detachably connected fixed clamping plate (10a) connecting bolt (10c).

10. The method of using a power line insulator string installation transfer car according to Claim 9, wherein, The method comprises the following steps: a、When the insulator is disassembled and installed, according to the length of the insulator to be disassembled and installed, the length of the trolley frame is first adjusted to ensure that it is suitable for the size of the insulator. By pulling the middle part of the control rod (409) in the original fixed frame (1) direction to extend the movable frame (2) part, the two ends of the control rod (409) are pulled to move the two sets of constraint seats (406) away from the positioning member (402) to separate the constraint seats (406) from the outside of the positioning member (402), thereby removing the constraint of the constraint seats (406) on the two sets of positioning members (402) to form a female thread, and then continue to pull the control rod (409) outward to pull the support plate (407) at the opening of the constraint seat (406) to the position of the supporting rail (404), and then push the supporting rod to drive the connecting rod (403) and the positioning member (402) to expand outward by the inclined expanding support plate (407), while the compression spring (405) is compressed by the supporting rail (404) to achieve active separation of the two positioning members (402) of the female thread, at this time the screw thread cooperation of the female thread and the screw rod (3) is released, and the movable frame (2) and its external accessories can slide freely in the length direction of the screw rod (3) to realize the rapid and rough adjustment of the distance between the movable frame (2) and the fixed frame (1); b、When the rough adjustment of the position of the movable frame (2) is completed, loosen the control rod (409) and push it back to the reset position, at this time the compression spring (405) releases the elastic force to push the supporting rod to drive the connecting rod (403) to support the two sets of positioning members (402) to reset again, and the female thread structure of the screw thread cooperation of the screw rod (3) is formed again, at the same time the constraint seat (406) moves to the outside of the female thread to keep the locking state of the tightness of the female thread, at this time pull up the knob (706) to drive the core rod (702) and the chuck (704) to move upward to separate the clamping pin (704a) from the clamping groove (102a), at this time rotate the knob (706) to drive the auxiliary cylinder (701) and the upper gear (703) to rotate, and then drive the transmission shaft (5) to rotate, and then drive the two shaft sleeves (103) to rotate synchronously by the worm gear (104) and the worm (502) mechanism to drive the screw rod (3) to rotate synchronously, and then realize the precise fine adjustment of the transverse position of the movable frame (2) and its accessories by the screw thread cooperation of the screw rod (3) and the female thread in the movable frame (2); c、When the distance between the fixed frame (1) and the movable frame (2) is adjusted to adapt to the length of the insulator to be disassembled and installed, the fixed frame (1) and the movable frame (2) are installed on the insulator end mounting members of the power transmission tower respectively, and the two sets of clamps (10) are fixed on the two ends of the insulator, and then pull the four trolley ropes (11) at both ends to pull the clamps (10) to support the insulator to be straightened and tightened under the support of the fixed pulley (903), so as to ensure that the end fittings of the insulator are pulled close to the power transmission tower mounting member, and the clamps (10) are pulled by the trolley rope (11) to resist the weight of the insulator, so as to bear the suspension tension in the process of installing the insulator by the pulley assembly (9). d、When the position of the insulator end needs to be adjusted, the adjusting rod (802) is rotated by rotating the rotating disc (803), and the two adjusting rods (802) at the same end are synchronously rotated through the synchronous belt (12), so that the guide block (902) is driven to move transversely through the threaded cooperation of the adjusting rod (802) and the guide block (902), thereby changing the transverse position of the pulley assembly (9), and the suspension point of the trolley rope (11) on the fixed pulley (903) is changed, so that the relative position of the insulator end mounting fitting and the power transmission tower mounting member is adjusted.

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