Special hoisting tool for switching core of on-load switch of transformer

Abstract

The invention discloses a special hoisting tool for a transformer on-load switch switching core, and particularly relates to the technical field of hoisting tools, the special hoisting tool comprises a stand column, a mounting seat fixedly welded at the bottom of the stand column, a turntable rotatably mounted at the top of the stand column, a fixing frame welded at the top of the turntable, and a hoisting arm piece mounted on the fixing frame; the suspension arm piece is composed of a sleeve piece with the open front end, and a telescopic arm is installed in the sleeve piece in a sliding mode. Under the limitation of the rotating mechanism, the rotating disc can be limited, meanwhile, through the rotating arrangement of the rotating disc and the stand column, the hoisting position of a hoisting tool can be conveniently adjusted in the circumferential direction, the hoisting interval is wider, and under the action of the limiting mechanism, when it is monitored that the descending speed of a steel rope of an electric hoist is too high, the hoisting tool is not damaged. Multiple clamping limitation on the steel rope of the electric hoist is completed, stable operation of the electric hoist is ensured, unexpected safety accidents are avoided, and the safety of a hoisting tool is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting tools, and particularly to a special hoisting tool for the on-load tap changer core of a transformer. Background Art

[0002] The on-load tap changer is used in power transformers or industrial transformers to tap under the condition that the transformer does not interrupt the load current (i.e., on-load condition), change the turns ratio of the transformer, thereby adjusting the output voltage of the transformer. At the same time, when installing the on-load tap changer core, in some installation environments and indoor places where it is inconvenient to use a crane, some small hoisting tools are needed to complete the hoisting work of small objects such as the switch core, which is convenient for assembly.

[0003] However, after the current hoisting tool is fixed, the hoisting angle cannot be freely rotated and adjusted, resulting in a small hoisting range of the hoisting tool, which is not convenient for the staff to adjust and use. At the same time, the current hoisting tool does not have a safety locking function. Therefore, when the electric hoist on the hoisting tool fails to complete the active detection and locking action, safety accidents are extremely likely to occur, with poor safety and high operating risks. Summary of the Invention

[0004] The purpose of the present invention is to provide a special hoisting tool for the on-load tap changer core of a transformer to solve the above technical problems.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions.

[0006] The present invention is a special hoisting tool for the on-load tap changer core of a transformer, including a column. An installation base is fixedly welded at the bottom of the column. A turntable is rotatably installed at the top of the column. A fixed frame is welded on the top of the turntable. A boom member is installed on the fixed frame. The boom member consists of a sleeve member with an open front end. A telescopic arm is slidably installed in the sleeve member. The length of the boom member is adjusted by the telescopic movement of the telescopic arm in the sleeve member. A rotating mechanism is installed between the column and the turntable, and this rotating mechanism is used to limit the rotation of the turntable. A hoisting mechanism is installed on the top of the boom member to complete the hoisting work. At the same time, a limiting mechanism is installed on the boom member, and this limiting mechanism is used to limit and protect the hoisting mechanism.

[0007] Furthermore, a plurality of adjustment holes are penetrated through the sleeve member, and a connecting bolt is slidably penetrated through one of the adjustment holes. The connecting bolt correspondingly passes through the adjustment hole and the through hole of the telescopic arm, and the telescopic arm is fixed in the sleeve member through the connecting bolt.

[0008] Further, the hoisting mechanism includes an electric hoist installed on one side of the top of the sleeve through a bracket. One end of the upper surface of the sleeve away from the electric hoist is rotatably installed with a first guide wheel through a bracket, and one side of the top of the telescopic arm is rotatably installed with a second guide wheel through a bracket. The steel wire rope on the electric hoist is guided by the first guide wheel and the second guide wheel.

[0009] Further, the rotating mechanism includes a gear ring fixedly sleeved outside the turntable. One side of the top of the column is fixedly welded with an adjusting seat. A slider is slidably installed in the adjusting seat. An adjusting spring is installed between the slider and the adjusting seat. An arc-shaped tooth plate is installed on the upper surface of the slider. A handle is installed on one side of the arc-shaped tooth plate. The arc-shaped tooth plate contacts and meshes with the gear ring under the push of the adjusting spring.

[0010] Further, the limiting mechanism includes a fixed seat installed on the top of the sleeve. A concave seat is installed on the upper surface of the fixed seat. Lifting areas are respectively penetrated through both sides of the concave seat. Lifting platforms are slidably installed in the two lifting areas. An adjusting screw is screwed through the top of the lifting area. The bottom of the adjusting screw is rotatably connected to the upper surface of the lifting platform. A first friction roller is rotatably installed between the two lifting platforms. A second friction roller is fixedly installed at the bottom of the concave seat below the first friction roller. The second friction roller is parallel to the first friction roller. A rotational speed sensor is installed on one side of one of the lifting platforms. The rotational speed sensor contacts one end of the first friction roller to complete rotational speed detection. A clamping fixture is installed on one side of the concave seat through a bracket. The steel wire rope on the electric hoist is clamped and limited by the clamping fixture.

[0011] Further, the clamping fixture includes a clamping frame that is penetrated through both the left and right sides. A first platform is fixedly installed at the bottom of the clamping frame. A first friction plate is detachably installed on the first platform. A second platform is slidably installed at the top of the clamping frame. A second friction plate is detachably installed on the second platform. The steel wire rope of the electric hoist is clamped and limited by the first friction plate and the second friction plate. A hydraulic cylinder is fixedly penetrated through the top of the clamping frame. The output end of the hydraulic cylinder is fixedly connected to the second platform.

[0012] Further, annular discs are fixedly sleeved at both ends of the first friction roller. Slide frames are installed on one side of the two lifting platforms. Sliding members are slidably installed in the slide frames. Arc-shaped brake pads are installed at the front ends of the sliding members. The arc-shaped brake pads are in frictional contact with the annular discs to complete the rotation limitation of the first friction roller. Linkage rods are installed at the tails of the sliding members. Fixed plates are slidably installed on both sides of the clamping frame. The tails of the linkage rods slide through the slide frames and the fixed plates. A return spring is installed between the sliding members and the slide frames. The return spring is correspondingly sleeved outside the linkage rods.

[0013] Furthermore, the fixed plate is fixedly connected to the second platform. A manual sliding table is installed on the fixed plate, and a first wedge block is installed at the output end of the manual sliding table. The first wedge block is linked with the second platform. A second wedge block is installed at the tail of the linkage rod, and the first wedge block and the second wedge block are arranged in cooperation. The arc-shaped brake pad is pushed towards the annular disc by the extrusion of the first wedge block on the second wedge block.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. By providing a limiting mechanism in the present invention, when the hydraulic cylinder is started, the first friction plate and the second friction plate are both in contact with the steel rope of the electric hoist to complete friction limitation, so as to realize the deceleration and even clamping of the steel rope, avoid the occurrence of safety accidents. At the same time, during the downward movement of the second platform, the fixed plate is linked to move downward synchronously. The slider and the arc-shaped brake pad are pushed forward by the linkage rod to contact the annular disc to complete braking, so that the first friction roller is restricted to stop. Under the friction limitation of the first friction roller and the second friction roller, the secondary limitation of the steel rope of the electric hoist is completed;

[0016] 2. By providing a rotating mechanism in the present invention, when the hoisting angle needs to be adjusted, only need to pull the handle, drive the arc-shaped toothed plate to move in the adjusting seat along with the slider, so that the arc-shaped toothed plate is separated from the toothed ring to complete unlocking. Subsequently, only need to rotate the boom member correspondingly to complete the circumferential adjustment of the hoisting angle, expand the hoisting range, and facilitate the adjustment and use by the staff.

[0017] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall front view of the present invention;

[0019] Figure 2 is the schematic diagram of the rotating mechanism of the present invention;

[0020] Figure 3 is the installation schematic diagram of the hoisting mechanism of the present invention on the boom member;

[0021] Figure 4 is the schematic diagram of the hoisting mechanism of the present invention;

[0022] Figure 5 is the schematic diagram of the limiting mechanism of the present invention;

[0023] Figure 6 is the schematic diagram of the distribution of the first friction rollers of the present invention in the concave seat;

[0024] Figure 7 is the schematic diagram of the distribution of the first friction roller and the second friction roller of the present invention;

[0025] Figure 8 Schematic diagram of the distribution of the annular disc and the arc-shaped brake pads of the present invention.

[0026] In the figure: 1, column; 2, mounting seat; 3, turntable; 4, fixing frame; 5, lifting arm member; 501, sleeve member; 502, telescopic arm; 6, adjustment hole; 7, connecting bolt; 8, electric hoist; 9, first guide wheel; 10, second guide wheel; 11, gear ring; 12, adjustment seat; 13, slider; 14, adjustment spring; 15, arc-shaped tooth plate; 16, handle; 17, fixing seat; 18, concave seat; 19, lifting area; 20, lifting platform; 21, adjustment screw; 22, first friction roller; 23, second friction roller; 24, rotational speed sensor; 25, fixture member; 2501, clamping frame; 2502, first platform; 2503, first friction plate; 2504, second platform; 2505, second friction plate; 2506, hydraulic cylinder; 26, annular disc; 27, sliding frame; 28, sliding member; 29, arc-shaped brake pad; 30, linkage rod; 31, fixing plate; 32, return spring; 33, manual sliding table; 34, first wedge block; 35, second wedge block. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0029] Embodiment 1: The present invention provides a technical solution: As Figure 1 , Figure 3 and Figure 4As shown in the figure, there is a special lifting tool for the on-load tap changer core of a transformer, which includes a column 1. At the bottom of the column 1, a mounting base 2 is fixedly welded. Mounting holes are penetrated through the four corners of the mounting base 2. At the top of the column 1, a turntable 3 is rotatably installed. At the top of the turntable 3, a fixing frame 4 is welded. On the fixing frame 4, a boom member 5 is installed. The boom member 5 consists of a sleeve member 501 with an open front end. Inside the sleeve member 501, a telescopic arm 502 is slidably installed. The length adjustment of the boom member 5 is completed by the telescoping of the telescopic arm 502 inside the sleeve member 501. A rotating mechanism is installed between the column 1 and the turntable 3, and this rotating mechanism is used to limit the rotation of the turntable 3. A lifting mechanism is installed on the top of the boom member 5, and the lifting work is completed through the lifting mechanism. At the same time, a limiting mechanism is installed on the boom member 5, and this limiting mechanism is used to complete the limiting protection of the lifting mechanism. A plurality of adjustment holes 6 are penetrated through the sleeve member 501, and a connecting bolt 7 is slidably penetrated through one of the adjustment holes 6. A through hole matching with the connecting bolt 7 is penetrated through the telescopic arm 502. The connecting bolt 7 is correspondingly arranged through the adjustment hole 6 and the through hole of the telescopic arm 502, and the telescopic arm 502 is fixed inside the sleeve member 501 through the connecting bolt 7;

[0030] Among them, the lifting mechanism includes an electric hoist 8 installed on one side of the top of the sleeve member 501 through a bracket. On the upper surface of the sleeve member 501, away from one end of the electric hoist 8, a first guide wheel 9 is rotatably installed through a bracket. On one side of the top of the telescopic arm 502, a second guide wheel 10 is rotatably installed through a bracket. The steel rope on the electric hoist 8 is guided through the first guide wheel 9 and the second guide wheel 10.

[0031] Among them, each electrical component on the lifting mechanism and the limiting mechanism is connected to a switch through a wire, and the switch is electrically connected to a controller, and the specific structure of the controller is not limited.

[0032] Embodiment 2: Based on the rotating mechanism provided in Embodiment 1, this embodiment provides a further technical solution for the rotating mechanism.

[0033] As Figure 2 shown, the rotating mechanism includes a gear ring 11 fixedly sleeved outside the turntable 3. On one side of the top of the column 1, an adjustment seat 12 is fixedly welded. Inside the adjustment seat 12, a slider 13 is slidably installed. An adjustment spring 14 is installed between the slider 13 and the adjustment seat 12. On the upper surface of the slider 13, an arc-shaped tooth plate 15 is installed. On one side of the arc-shaped tooth plate 15, a handle 16 is installed. The arc-shaped tooth plate 15 is in contact and meshed with the gear ring 11 under the push of the adjustment spring 14;

[0034] It should be noted that during rotational adjustment: by providing a rotational mechanism, when the hoisting angle needs to be adjusted, only the handle 16 needs to be pulled, driving the arc-shaped toothed plate 15 to move along with the slider 13 within the adjustment seat 12, causing the arc-shaped toothed plate 15 to separate from the toothed ring 11 to complete unlocking. Subsequently, only the boom member 5 needs to be rotated correspondingly to complete the circumferential adjustment of the hoisting angle, expanding the hoisting range and facilitating the adjustment and use by the staff. When the adjustment is completed, the handle 16 is released, and under the action of the adjustment spring 14, the arc-shaped toothed plate 15 is pulled back to engage with the toothed ring 11 to complete the limiting lock.

[0035] Embodiment 3: Based on the limiting mechanism provided in Embodiment 1, this embodiment provides a further technical solution for the limiting mechanism.

[0036] As Figures 5 - 8 shown, the limiting mechanism includes a fixed seat 17 installed on the top of the sleeve member 501. On the upper surface of the fixed seat 17, a concave seat 18 is installed. On both sides of the concave seat 18, lifting areas 19 are penetrated and opened. In both lifting areas 19, lifting platforms 20 are slidably installed. At the top of the lifting area 19, an adjusting screw 21 is screwed through threadedly. The bottom of the adjusting screw 21 is rotatably connected to the upper surface of the lifting platform 20. Between the two lifting platforms 20, a first friction roller 22 is rotatably installed. At the bottom inside the concave seat 18 and below the first friction roller 22, a second friction roller 23 is fixedly installed. The second friction roller 23 is distributed in parallel with the first friction roller 22. On one side of one of the lifting platforms 20, a rotational speed sensor 24 is installed. The rotational speed sensor 24 contacts one end of the first friction roller 22 to complete the rotational speed detection. On one side of the concave seat 18, a clamping member 25 is installed through a bracket, and the steel rope on the electric hoist 8 is clamped and restricted through the clamping member 25;

[0037] It should be noted that when imposing restrictions: by providing a restricting mechanism, under normal conditions, the steel rope of the electric hoist 8 correspondingly passes through between the first friction roller 22, the second friction roller 23, the first friction plate 2503, and the second friction plate 2505. Moreover, the first friction roller 22 and the second friction roller 23 are in contact with the steel rope. Due to the movement of the steel rope, the first friction roller 22 rotates. The rotation speed sensor 24 is used to monitor the rotation speed of the first friction roller 22. When a failure occurs in the electric hoist 8, it will cause the steel rope on it to lose force and fall, resulting in an increase in the moving speed of the steel rope on the electric hoist 8. The external controller receives the signal from the rotation speed sensor 24 and activates the hydraulic cylinder 2506, which pushes the second friction plate 2505 to move downward within the clamping frame 2501, causing both the first friction plate 2503 and the second friction plate 2505 to come into contact with the steel rope of the electric hoist 8 to complete frictional restriction, thereby achieving deceleration and even clamping of the steel rope, avoiding the occurrence of safety accidents. At the same time, during the downward movement of the second platform 2504, the fixed plate 31 is synchronously moved downward. The first wedge block 34 is driven by the fixed plate 31 to complete the extrusion movement of the second wedge block 35. The sliding member 28 and the arc-shaped brake pad 29 are pushed forward by the linkage rod 30 to come into contact with the annular disc 26 to complete braking, causing the first friction roller 22 to be restricted and stop. With the frictional restriction between the first friction roller 22 and the second friction roller 23, secondary restriction of the steel rope of the electric hoist 8 is completed, further improving stability. At the same time, under the action of the manual sliding table 33, the position of the first wedge block 34 can be compensated. Moreover, the distance between the first friction roller 22 and the second friction roller 23 can be adjusted by the adjusting screw 21. Subsequently, the overall reset of the restricting mechanism is completed through the hydraulic cylinder 2506 and the return spring 32;

[0038] Among them, the fixture member 25 includes a clamping frame 2501 that is penetrated through on both the left and right sides. At the bottom inside the clamping frame 2501, a first platform 2502 is fixedly installed. The first friction plate 2503 is detachably installed on the first platform 2502. At the top inside the clamping frame 2501, a second platform 2504 is slidably installed. The second friction plate 2505 is detachably installed on the second platform 2504. The clamping and restricting of the steel rope of the electric hoist 8 are completed through the first friction plate 2503 and the second friction plate 2505. A hydraulic cylinder 2506 is fixedly penetrated through the top of the clamping frame 2501, and the output end of the hydraulic cylinder 2506 is fixedly connected to the second platform 2504.

[0039] In the embodiment of the present invention, annular discs 26 are fixedly sleeved at both ends of the first friction roller 22. Slide frames 27 are installed on one side of each of the two lifting platforms 20. Slide members 28 are slidably installed in the slide frames 27. Arc-shaped brake pads 29 are installed at the front ends of the slide members 28. The arc-shaped brake pads 29 are in frictional contact with the annular discs 26 to complete the rotation restriction of the first friction roller 22. Linkage rods 30 are installed at the tails of the slide members 28. Fixed plates 31 are slidably installed on both sides of the clamping frame 2501. The tails of the linkage rods 30 are slidably arranged through the slide frames 27 and the fixed plates 31. A return spring 32 is installed between the slide members 28 and the slide frames 27. The return spring 32 is correspondingly sleeved outside the linkage rods 30;

[0040] Among them, the fixed plates 31 are fixedly connected to the second platform 2504. Manual slide tables 33 are installed on the fixed plates 31. First wedge-shaped blocks 34 are installed at the output ends of the manual slide tables 33. The first wedge-shaped blocks 34 are linked with the second platform 2504. Second wedge-shaped blocks 35 are installed at the tails of the linkage rods 30. The first wedge-shaped blocks 34 and the second wedge-shaped blocks 35 are arranged in cooperation. The first wedge-shaped blocks 34 push the second wedge-shaped blocks 35 to move the arc-shaped brake pads 29 towards the annular discs 26 by extrusion.

[0041] The present invention provides a special lifting tool for the on-load tap changer core of a transformer. The specific working principle is as follows: First, the lifting tool is fixed in the lifting area through the mounting seat 2. At the same time, the boom member 5 can adjust the length through the telescopic movement of the telescopic arm 502 in the sleeve member 501, which is convenient for adjustment. After the adjustment is completed, the connecting bolts 7 are correspondingly passed through and locked in the corresponding adjustment holes 6. Subsequently, the electric hoist 8 is started, and the steel rope of the electric hoist 8 is guided through the first guide wheel 9 and the second guide wheel 10, which is convenient for the lifting work of the switch changer core, saving time and effort, and can complete the lifting work for the indoor space, improving the installation efficiency. At the same time, under the restriction of the rotating mechanism, the rotation of the turntable 3 can be restricted. At the same time, through the rotational setting of the turntable 3 and the column 1, it is convenient to adjust the lifting position of the lifting tool in the circumferential direction, making the lifting range wider. And under the action of the restricting mechanism, it monitors the moving speed of the steel rope of the electric hoist 8 under normal conditions. When it detects that the descending speed of the steel rope of the electric hoist 8 is too fast, it completes the multiple clamping restrictions on the steel rope of the electric hoist 8, ensuring the stable operation of the electric hoist 8, avoiding accidental safety accidents, and improving the safety of the lifting tool.

[0042] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A special lifting tool for the on-load tap-changer core of a transformer, comprising a column (1), with a mounting base (2) fixedly welded at the bottom of the column (1), a turntable (3) rotatably mounted at the top of the column (1), a fixing frame (4) welded on the top of the turntable (3), and a lifting arm member (5) mounted on the fixing frame (4), characterized in that: The lifting arm member (5) consists of a sleeve member (501) with an open front end. A telescopic arm (502) is slidably mounted within the sleeve member (501). The length adjustment of the lifting arm member (5) is completed by the telescoping of the telescopic arm (502) within the sleeve member (501). A rotating mechanism is installed between the column (1) and the turntable (3), and this rotating mechanism is used to limit the rotation of the turntable (3). A lifting mechanism is mounted on the top of the lifting arm member (5), and the lifting operation is completed through the lifting mechanism. At the same time, a limiting mechanism is installed on the lifting arm member (5), and this limiting mechanism is used to provide limiting protection for the lifting mechanism.

2. The special lifting tool for the on-load tap-changer core of the transformer according to claim 1, characterized in that: A plurality of adjustment holes (6) are penetrated through the sleeve member (501), and a connecting bolt (7) is slidably inserted through one of the adjustment holes (6). The connecting bolt (7) correspondingly passes through the adjustment hole (6) and the through-hole of the telescopic arm (502), and the telescopic arm (502) is fixed within the sleeve member (501) by the connecting bolt (7).

3. The dedicated lifting tool for the on-load tap-changer core of the transformer according to claim 1, characterized in that: The lifting mechanism includes an electric hoist (8) mounted on one side of the top of the sleeve member (501) through a bracket. A first guide wheel (9) is rotatably mounted at one end of the upper surface of the sleeve member (501) away from the electric hoist (8) through a bracket. A second guide wheel (10) is rotatably mounted on one side of the top of the telescopic arm (502) through a bracket. The guiding of the steel rope on the electric hoist (8) is completed by the first guide wheel (9) and the second guide wheel (10).

4. The special lifting tool for the on-load tap-changer core of the transformer according to claim 1, characterized in that: The rotating mechanism includes a gear ring (11) fixedly sleeved outside the turntable (3). An adjustment seat (12) is fixedly welded on one side of the top of the column (1). A slider (13) is slidably mounted within the adjustment seat (12). An adjustment spring (14) is installed between the slider (13) and the adjustment seat (12). An arc-shaped tooth plate (15) is mounted on the upper surface of the slider (13). A handle (16) is mounted on one side of the arc-shaped tooth plate (15). The arc-shaped tooth plate (15) contacts and meshes with the gear ring (11) under the push of the adjustment spring (14).

5. The special lifting tool for the on-load tap-changer core of the transformer according to claim 3, characterized in that: The limiting mechanism includes a fixed seat (17) installed on the top of the sleeve part (501). An concave seat (18) is installed on the upper surface of the fixed seat (17). Lifting areas (19) are penetrated and provided on both sides of the concave seat (18). Lifting platforms (20) are slidably installed in the two lifting areas (19). Adjusting screws (21) are screwed through the tops of the lifting areas (19). The bottoms of the adjusting screws (21) are rotatably connected to the upper surfaces of the lifting platforms (20). A first friction roller (22) is rotatably installed between the two lifting platforms (20). A second friction roller (23) is fixedly installed at the bottom inside the concave seat (18) and below the first friction roller (22). The second friction roller (23) is distributed in parallel with the first friction roller (22). A rotational speed sensor (24) is installed on one side of one of the lifting platforms (20). The rotational speed sensor (24) contacts one end of the first friction roller (22) to complete the rotational speed detection. A clamping member (25) is installed on one side of the concave seat (18) through a bracket. The clamping of the steel rope on the electric hoist (8) is completed through the clamping member (25).

6. The special lifting tool for the on-load tap-changer core of a transformer according to claim 5, characterized in that: The clamping member (25) includes a clamping frame (2501) that is penetrated on both the left and right. A first platform (2502) is fixedly installed at the bottom inside the clamping frame (2501). A first friction plate (2503) is detachably installed on the first platform (2502). A second platform (2504) is slidably installed at the top inside the clamping frame (2501). A second friction plate (2505) is detachably installed on the second platform (2504). The clamping of the steel rope of the electric hoist (8) is completed through the first friction plate (2503) and the second friction plate (2505). A hydraulic cylinder (2506) is fixedly penetrated through the top of the clamping frame (2501). The output end of the hydraulic cylinder (2506) is fixedly connected to the second platform (2504).

7. The special lifting tool for the on-load tap-changer core of the transformer according to claim 6, characterized in that: Annular discs (26) are fixedly sleeved on both ends of the first friction roller (22). Slide frames (27) are installed on one side of the two lifting platforms (20). Slide members (28) are slidably installed in the slide frames (27). Arc-shaped brake pads (29) are installed at the front ends of the slide members (28). The arc-shaped brake pads (29) are in frictional contact with the annular discs (26) to complete the rotation limitation of the first friction roller (22). A linkage rod (30) is installed at the tail of the slide member (28). Fixed plates (31) are slidably installed on both sides of the clamping frame (2501). The tail of the linkage rod (30) is slidably penetrated through the slide frame (27) and the fixed plate (31). A return spring (32) is installed between the slide member (28) and the slide frame (27). The return spring (32) is correspondingly sleeved outside the linkage rod (30).

8. The special lifting tool for the on-load tap-changer core of the transformer according to claim 7, characterized in that: The fixing plate (31) is fixedly connected to the second platform (2504). A manual sliding table (33) is installed on the fixing plate (31). A first wedge block (34) is installed at the output end of the manual sliding table (33). The first wedge block (34) is linked with the second platform (2504). A second wedge block (35) is installed at the tail of the linkage rod (30). The first wedge block (34) and the second wedge block (35) are arranged in cooperation. The first wedge block (34) squeezes the second wedge block (35) to push the arc-shaped brake pad (29) to move towards the annular disc (26).

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