Open type transformer substation primary equipment hoisting tool

Abstract

The invention discloses an open type transformer substation primary equipment hoisting tool, and belongs to the field of hoisting tools, the open type transformer substation primary equipment hoisting tool comprises a fork-shaped support and a hanging bracket, the fork-shaped support comprises a fixing frame, a first hanging ring is arranged on the lower portion of the fixing frame, and a fly boom is arranged on one side of the fixing frame; the hanging bracket comprises a first clamping arm and a second clamping arm, the second clamping arm is hinged to the interior of the mounting groove, the second clamping arm and the first clamping arm form a shear fork structure, and clamping plates are arranged at the two ends of the first clamping arm and the two ends of the second clamping arm; extending frames are arranged on one sides of the clamping plates on the upper portions of the first clamping arm and the second clamping arm, second lifting rings are arranged on the extending frames, the first lifting rings and the second lifting rings are connected through first lifting chains, and after the mutual inductor is lifted, the first lifting chains on the two sides are in a splayed inclined state. When the mutual inductor is hoisted, the fork-shaped bracket is arranged at the position about 1 / 3 away from the upper end of the mutual inductor, so that the safe distance between the cargo boom and an electrified bus above the cargo boom is ensured, the risk of electric shock is avoided, and efficient operation without enlarging the power failure range and depending on frequent adjustment of a hoisting arm is realized.

Description

Technical Field

[0001] This invention belongs to the field of hoisting tools, and specifically relates to a hoisting fixture for primary equipment in an open substation. Background Technology

[0002] In the construction and maintenance of open substations, instrument transformers, as core primary equipment, require hoisting for installation and replacement. The commonly used traditional hoisting method in the industry involves using a crane hook as the core lifting component. After securing the instrument transformer body with ropes, the hook provides upward lifting force directly above the transformer, enabling the equipment to be raised, lowered, and moved.

[0003] This traditional approach has become a fixed operating mode in long-term application. It relies on the coaxial alignment of the hook and the equipment (the hook must be directly above the equipment) to ensure lifting stability. It is the mainstream method for lifting primary equipment in substations.

[0004] Although traditional hook lifting methods are widely used, they have revealed significant technical shortcomings in actual operation scenarios, as follows: Firstly, in open-type substations, high-voltage energized equipment such as busbars are typically located above instrument transformers. In traditional solutions, the lifting hook must be positioned directly above the instrument transformer, making it difficult to guarantee a safe distance between the hook and the energized busbars during lifting. To avoid the risk of electric shock, the lifting height must be strictly controlled, resulting in extremely poor flexibility in equipment lifting, especially in areas with dense busbars, where the planned lifting actions often cannot be completed due to height limitations. Secondly, improper operation during the lifting process can lead to insufficient distance between the hook and the live busbar, which can easily cause safety accidents such as high-voltage discharge and equipment collision, threatening the personal safety of construction personnel and the safe operation of power equipment. On the other hand, when a single hook is lifted from above, the force on the equipment is concentrated at the top binding point, which can easily cause the equipment to tilt and sway during the lifting process, further increasing the risk of interference with surrounding live equipment. Furthermore, to meet the safety operating conditions of traditional hoisting schemes, when there is a conflict between the overhead energized busbar and the hoisting path, it is often necessary to de-energize more areas of the busbar to expand the safe operating space. This practice not only increases the workload of power outage operations but also leads to a reduction in the power supply range and a longer power outage duration, resulting in significant power supply losses and reducing the reliability of power grid operation. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an open substation primary equipment hoisting tool to solve the dependence of traditional hoisting schemes on overhead space, reduce the limitation of hoisting height on live equipment, improve the flexibility and safety of hoisting operations, and avoid unnecessary power outages.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A hoisting fixture for primary equipment in an open substation, comprising: A fork-shaped support, the fork-shaped support including a fixed frame, the fixed frame being a semi-circular ring structure, a first lifting ring being provided at the lower part of the fixed frame, and a flying arm being provided on one side of the fixed frame, the flying arm being connected to the lifting arm of the crane; A lifting frame is used for hoisting current transformers in primary equipment. The lifting frame includes a first clamping arm and a second clamping arm. The first clamping arm has mounting grooves on both sides. The second clamping arm is hinged inside the mounting grooves and forms a scissor structure with the first clamping arm. Both ends of the first and second clamping arms are provided with clamping plates for clamping the current transformer. An extension frame is provided on one side of the clamping plate at the upper part of the first and second clamping arms. The extension frame is provided with a second lifting ring. The first and second lifting rings are connected by a first lifting chain. After the current transformer is hoisted, the first lifting chains on both sides are tilted in a figure-eight shape.

[0007] Furthermore, the upper end of the flying arm is hinged to the side wall of the fixed frame, and a leveling mechanism is provided on one side of the flying arm for leveling the fixed frame. The leveling mechanism includes a leveling cylinder, the cylinder seat of the leveling cylinder is hinged to the flying arm, and the piston rod of the leveling cylinder is hinged to the fixed frame.

[0008] Furthermore, the fixed frame includes a rotating body with an arc-shaped guide rail at its lower part. The fixed frame has an arc-shaped guide groove that slides with the arc-shaped guide rail. The first lifting ring is mounted on the rotating body, which has a limiting arc groove. An internal gear ring is also provided on the side wall of the rotating body. The frame also includes a rotating mechanism, which includes a motor fixedly mounted on the lower part of the fixed frame. The output shaft of the motor is located inside the limiting arc groove, and a gear is connected to the output shaft of the motor. The gear meshes with the internal gear ring.

[0009] Furthermore, the inner wall of the fixing frame is provided with a collision protection plate, which is made of rubber.

[0010] Furthermore, the clamping plate includes a fixed plate, the extension frame is connected to the fixed plate at the upper end of the first clamping arm and the second clamping arm, the fixed plate is provided with sliding grooves on both sides, the bottom of the sliding groove is provided with a through adjustment groove, an adjustment plate is slidably connected inside the sliding groove, the lower part of the adjustment plate is provided with several adjustment rods, the adjustment rods pass through the adjustment groove and are threadedly connected with fastening nuts, and one end of the adjustment plate is connected to the first clamping arm or the second clamping arm through a pin.

[0011] Furthermore, the lower ends of the first and second clamping arms are both fitted with telescopic sleeves, and the lower clamping plates are installed on the telescopic sleeves. A second fixed seat is fixedly connected to the telescopic sleeves, and the lower ends of the first and second clamping arms are both fixedly connected to the first fixed seat. An adjusting screw is rotatably connected to the first fixed seat, and the adjusting screw is threadedly connected to the second fixed seat. The clamping plates at the lower ends of the first and second clamping arms are of equal or unequal height.

[0012] Furthermore, it also includes a bracket on which the current transformer is placed for secondary protection during the hoisting of the current transformer. The bracket includes a support plate with a fourth lifting ring on the support plate. The telescopic sleeve has a pull rod at its end and a third lifting ring at its lower end. The third lifting ring and the fourth lifting ring are connected by a second lifting chain. After the current transformer is hoisted, the second lifting chains on both sides are in a "V" shaped inclined state.

[0013] Furthermore, the telescopic sleeve is hinged to a threaded sleeve at its end, and the pull rod is threadedly connected to the threaded sleeve.

[0014] Furthermore, the support plate is provided with clearance holes, and the diameter of the clearance holes is larger than the bottom size of the current transformer. The support plate is also provided with several sleeves, and a support arm is slidably connected inside the sleeve. A locking bolt is threaded on the sleeve for locking after the support arm is extended or retracted.

[0015] The beneficial effects of this invention are: (1) When hoisting the current transformer, the fork-shaped bracket is set at a position about 1 / 3 of the distance from the upper end of the current transformer, which ensures a safe distance between the lifting arm and the live bus above, thereby avoiding the risk of electric shock and realizing efficient operation without expanding the power outage range and without relying on frequent adjustment of the lifting arm.

[0016] (2) Rubber anti-collision baffles are installed on the inner wall of the fixed frame to avoid collision between the current transformer and the fork-shaped bracket during the lifting process, and to avoid damage to the current transformer by the fork-shaped bracket.

[0017] (3) The clamping plate adopts a telescopic structure, which makes it easy to flexibly adjust the distance between the first clamping arm and the second clamping arm, thereby matching the hoisting requirements of current transformers of different diameters and improving the flexibility of hoisting tooling.

[0018] (4) A telescopic sleeve is provided at the lower end of the first and second clamping arms to facilitate flexible adjustment of the upper and lower positions of the clamping plates at the lower end of the clamping arms, ensuring that the clamping plates can be accurately inserted into the lower part of the umbrella skirt of different specifications of current transformers; in addition, the telescopic sleeve provides two modes: "equal height clamping" and "staggered clamping" to adapt to different operational needs; when the clamping plate height is the same, it can form a symmetrical and stable clamping of the lower part of the current transformer umbrella skirt, ensuring balanced force; when the clamping plate height is different, a staggered clamping structure is formed, which increases the contact friction with the current transformer through the staggered interlocking of the clamping plates on both sides, restricting the up and down movement and circumferential rotation of the equipment. Even if there is slight shaking during the hoisting process, it can prevent the current transformer from slipping off, greatly improving the clamping stability and risk resistance of the hoist.

[0019] (5) By setting up brackets, secondary protection is provided for the current transformer, avoiding the risk of the current transformer slipping due to the failure of the single clamping structure of the hanger. Combined with the clamping force of the hanger on the umbrella skirt, a composite hoisting structure of upper clamping + lower support is formed, which further ensures the reliability of hoisting.

[0020] (6) A threaded sleeve is provided at the end of the telescopic sleeve, and the pull rod is threadedly connected to the threaded sleeve to facilitate the adjustment of the length of the second lifting chain, adapt to the center of gravity position and bottom structure differences of different specifications of current transformers, ensure that the support plate is in a horizontal state to lift the current transformer, avoid the tilting of the support plate and the displacement of the current transformer on the support due to inconsistent length of the lifting chain, and ensure the lifting stability from the bottom posture.

[0021] (7) A clearance hole and a telescopic support arm are provided on the tray. When the current transformer is hoisted, the bracket is inserted into the current transformer from above. After the current transformer is hoisted to a certain height, the support arm is extended to the center of the clearance hole to support the bottom of the current transformer. When the current transformer is hoisted into place for installation, the locking bolts are loosened and the support arm is pulled out to avoid the support arm interfering with the installation of the current transformer. The installation of the current transformer can be completed without the need to completely remove the bracket, which improves the efficiency of the current transformer hoisting operation. Attached Figure Description

[0022] Figure 1 This is a diagram showing the usage status of a hoisting tool for primary equipment in an open substation according to the present invention.

[0023] Figure 2 This is a schematic diagram of a hoisting fixture structure for primary equipment in an open substation according to the present invention.

[0024] Figure 3 This is a schematic diagram of a fork-shaped support structure.

[0025] Figure 4 This is a bottom view of the fork-shaped bracket.

[0026] Figure 5 This is a schematic diagram of the hanger structure.

[0027] Figure 6This is a schematic diagram of the first clamping arm structure.

[0028] Figure 7 This is a schematic diagram of one side of the clamping plate.

[0029] Figure 8 This is a schematic diagram of the other side of the clamp.

[0030] Figure 9 This is a schematic diagram of the bracket structure.

[0031] In the diagram, 1. Fork-shaped bracket; 11. Fixed frame; 12. Rotating body; 13. Arc-shaped guide rail; 14. First lifting ring; 15. Limiting arc groove; 16. Internal gear ring; 17. Flying arm; 18. Leveling cylinder; 19. Anti-collision baffle; 110. First lifting chain; 2. Rotating mechanism; 21. Motor; 22. Gear; 3. Hanger; 31. First clamping arm; 311. Mounting groove; 312. Extension frame; 313. Second lifting ring; 32. Clamping plate; 321. Fixed plate 322. Slide groove; 323. Adjusting groove; 324. Adjusting plate; 325. Adjusting rod; 326. Pin; 33. Telescopic sleeve; 34. First fixed seat; 35. Second fixed seat; 36. Adjusting screw; 37. Screw sleeve; 38. Pull rod; 381. Third lifting ring; 39. Second clamping arm; 310. Second lifting chain; 4. Bracket; 41. Support plate; 42. Fourth lifting ring; 43. Clearance hole; 44. Sleeve; 45. Support arm; 46. Locking bolt. Detailed Implementation

[0032] The following will be combined with the appendix Figures 1-9 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] like Figure 1 , Figure 2 As shown, a hoisting fixture for primary equipment in an open substation includes a fork-shaped support 1 and a lifting frame 3, as shown. Figure 3As shown, the fork-shaped bracket 1 includes a fixed frame 11, which is a semi-circular ring structure. The lower part of the fixed frame 11 is provided with a first lifting ring 14, and a flying arm 17 is provided on one side of the fixed frame 11. The flying arm 17 is connected to the lifting arm of the crane (not shown in the figure). Hanger 3 is used for hoisting current transformers in primary equipment, such as... Figure 5 As shown, the hanger 3 includes a first clamping arm 31 and a second clamping arm 39, as... Figure 6 As shown, the first clamping arm 31 has mounting grooves 311 on both sides, and the second clamping arm 39 is hinged inside the mounting grooves 311, forming a scissor structure with the first clamping arm 31. Both ends of the first clamping arm 31 and the second clamping arm 39 are provided with clamping plates 32 for clamping the current transformer. An extension frame 312 is provided on one side of the clamping plates 32 on the upper part of the first clamping arm 31 and the second clamping arm 39. A second lifting ring 313 is provided on the extension frame 312. The first lifting ring 14 and the second lifting ring 313 are connected by a first lifting chain 110. Figure 1 , Figure 2 As shown, after the current transformer is lifted, the first lifting chains 110 on both sides are tilted in a figure-eight shape.

[0035] like Figure 4 As shown, the upper end of the flying arm 17 is hinged to the side wall of the fixed frame 11. A leveling mechanism is provided on one side of the flying arm 17 for leveling the fixed frame 11. The leveling mechanism includes a leveling cylinder 18. The cylinder seat of the leveling cylinder 18 is hinged to the flying arm 17, and the piston rod of the leveling cylinder 18 is hinged to the fixed frame 11.

[0036] When a current transformer is installed at an angle but the crane boom is inconvenient to adjust, the leveling mechanism provides an independent leveling solution. It can correct the attitude of the current transformer without relying on the boom adjustment, which makes up for the limitations of relying on the boom leveling in traditional hoisting and improves the adaptability of the tooling in complex working environments.

[0037] like Figure 3 , Figure 4 As shown, the fixed frame 11 has a rotating body 12 inside, and an arc-shaped guide rail 13 is provided at the lower part of the rotating body 12. The fixed frame 11 has an arc-shaped guide groove that slides with the arc-shaped guide rail 13. The first lifting ring 14 is installed on the rotating body 12. The rotating body 12 has a limiting arc groove 15. An internal gear ring 16 is also provided on the side wall of the rotating body 12. The fixed frame 11 also includes a rotating mechanism 2. The rotating mechanism 2 includes a motor 21 fixedly installed at the lower part of the fixed frame 11. The output shaft of the motor 21 is located inside the limiting arc groove 15, and a gear 22 is connected to the output shaft of the motor 21. The gear 22 meshes with the internal gear ring 16.

[0038] To address the angular deviation between the mounting hole at the bottom of the instrument transformer and the base bolt, the motor 21 drives the gear 22 to mesh with the internal gear ring 16, causing the rotating body 12 to rotate smoothly along the arc-shaped guide groove. This enables precise fine-tuning of the instrument transformer angle, ensuring rapid and accurate alignment of the mounting hole and bolt. This avoids the alignment deviation caused by manual prying and repeated adjustments of the crane in traditional hoisting, thus ensuring the standardization and reliability of equipment installation and improving the efficiency of instrument transformer hoisting and installation operations.

[0039] like Figure 3 As shown, the inner wall of the fixing frame 11 is provided with a collision protection plate 19. The collision protection plate 19 is made of rubber, which not only avoids the collision between the current transformer and the fork-shaped bracket 1 during the lifting process, but also avoids the fork-shaped bracket 1 from damaging the current transformer.

[0040] like Figure 7 , Figure 8 As shown, the clamping plate 32 includes a fixed plate 321. The extension frame 312 is connected to the fixed plate 321 at the upper end of the first clamping arm 31 and the second clamping arm 39. The fixed plate 321 has sliding grooves 322 on both sides. The bottom of the sliding groove 322 has a through adjustment groove 323. An adjustment plate 324 is slidably connected inside the sliding groove 322. The lower part of the adjustment plate 324 is provided with several adjustment rods 325. The adjustment rods 325 pass through the adjustment groove 323 and are threaded with fastening nuts. One end of the adjustment plate 324 is connected to the first clamping arm 31 or the second clamping arm 39 through a pin 326.

[0041] By adjusting the sliding engagement of the adjusting plate 324 within the slide groove 322 of the fixed plate 321, the distance between the first clamping arm 31 and the second clamping arm 39 can be flexibly adjusted, thereby matching the hoisting requirements of current transformers of different diameters and specifications. This breaks the limitation of traditional hoisting tools that can only be adapted to a single specification of equipment, and reduces the cost of using the equipment.

[0042] like Figure 6 As shown, the lower ends of the first clamping arm 31 and the second clamping arm 39 are both fitted with telescopic sleeves 33, and the lower clamping plates 32 are installed on the telescopic sleeves 33. The telescopic sleeves 33 are fixedly connected to the second fixing seats 35. The lower ends of the first clamping arm 31 and the second clamping arm 39 are both fixedly connected to the first fixing seats 34. The first fixing seats 34 are rotatably connected to the adjusting screws 36, and the adjusting screws 36 are threadedly connected to the second fixing seats 35. The heights of the clamping plates 32 at the lower ends of the first clamping arm 31 and the second clamping arm 39 are equal or unequal.

[0043] By turning the adjusting screw 36 to drive the telescopic sleeve 33 to extend and retract, the up and down position of the clamping plate 32 at the lower end of the clamping arm can be flexibly adjusted, ensuring that the clamping plate 32 can be accurately inserted into the lower part of the umbrella skirt of different specifications of current transformers (adapting to current transformers with different umbrella skirt spacing and size). This makes up for the limitation that the clamping arm spacing adjustment alone cannot adapt to the specific clamping position of the umbrella skirt, further improving the tooling's adaptability to current transformers with different structures and specifications, without the need to change the tooling due to differences in umbrella skirt design.

[0044] In addition, the telescopic sleeve 33 provides two modes: "equal height clamping" and "staggered clamping" to adapt to different operational needs. When the clamping plates 32 are at the same height, they can form a symmetrical and stable clamping on the lower part of the transformer skirt to ensure balanced force. When the clamping plates 32 are at different heights, a staggered clamping structure is formed. The staggered interlocking of the clamping plates 32 on both sides increases the contact friction with the transformer, restricting the vertical movement and circumferential rotation of the equipment. Even if there is slight shaking during the hoisting process, the transformer can be prevented from slipping off, which greatly improves the clamping stability and risk resistance of the hanger 3.

[0045] like Figure 1 , Figure 2 , Figure 9 As shown, it also includes a bracket 4, on which the current transformer is placed for secondary protection during the lifting of the current transformer. The bracket 4 includes a support plate 41, on which a fourth lifting ring 42 is provided. The telescopic sleeve 33 has a pull rod 38 at one end, and a third lifting ring 381 at the lower end of the pull rod 38. The third lifting ring 381 and the fourth lifting ring 42 are connected by a second lifting chain 310. After the current transformer is lifted, the second lifting chains 310 on both sides are in a "V" shaped tilt. The bracket 4 provides secondary protection for the current transformer, avoiding the risk of the current transformer slipping due to the failure of the single clamping structure of the hanger 3. Combined with the clamping force of the hanger 3 on the umbrella skirt, a composite lifting structure of upper clamping + lower support is formed, further ensuring the reliability of the lifting.

[0046] like Figure 5 , Figure 6 As shown, the telescopic sleeve 33 is hinged to the end of a threaded sleeve 37, and the pull rod 38 is threadedly connected to the threaded sleeve 37. This facilitates the adjustment of the length of each second lifting chain 310, adapting to the center of gravity position and bottom structure differences of different specifications of current transformers, ensuring that the support plate 41 is in a horizontal state to support the current transformer, and avoiding the tilting of the support plate 41 and the displacement of the current transformer on the bracket 4 due to inconsistent chain lengths, thus ensuring the stability of the support from the bottom posture.

[0047] like Figure 9 As shown, the support plate 41 is provided with a clearance hole 43, and the diameter of the clearance hole 43 is larger than the bottom size of the current transformer. The support plate 41 is also provided with a plurality of sleeves 44, and a support arm 45 is slidably connected inside the sleeve 44. A locking bolt 46 is threadedly connected to the sleeve 44 for locking after the support arm 45 is extended or retracted.

[0048] During the hoisting of the current transformer, the bracket 4 is inserted into the current transformer from above. After the current transformer is hoisted to a certain height, the support arm 45 is extended toward the center of the clearance hole 43 and the support arm 45 is locked with the locking bolt 46 to support the bottom of the current transformer. When the current transformer is hoisted into place for installation, the locking bolt 46 is loosened and the support arm 45 is pulled out to avoid the support arm 45 interfering with the installation of the current transformer. The installation of the current transformer can be completed without the need to completely remove the bracket 4, which improves the efficiency of the current transformer hoisting operation.

[0049] This lifting fixture uses a fork-shaped support 1 as its load-bearing foundation, a scissor-type lifting frame 3 as its core clamping mechanism, an adjustable bracket 4 for secondary protection, and a leveling mechanism and a rotating mechanism 2 for precise adaptation. Through a coordinated mechanism of upper clamping, lower lifting, posture correction, and angle fine-tuning, the fork-shaped support 1 is positioned approximately one-third of the way from the top of the current transformer during lifting, ensuring a safe distance between the lifting boom and the overhead energized busbar, thus avoiding the risk of electric shock. It achieves safe, flexible, and precise lifting of current transformers in the energized environment of an open substation. It realizes highly efficient operation "without expanding the power outage area or relying on frequent boom adjustments."

[0050] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An open-type substation primary equipment hoisting tooling characterized by, include: A fork-shaped support, the fork-shaped support including a fixed frame, the fixed frame being a semi-circular ring structure, a first lifting ring being provided at the lower part of the fixed frame, and a flying arm being provided on one side of the fixed frame, the flying arm being connected to the lifting arm of the crane; A lifting frame is used for hoisting current transformers in primary equipment. The lifting frame includes a first clamping arm and a second clamping arm. The first clamping arm has mounting grooves on both sides. The second clamping arm is hinged inside the mounting grooves and forms a scissor structure with the first clamping arm. Both ends of the first and second clamping arms are provided with clamping plates for clamping the current transformer. An extension frame is provided on one side of the clamping plate at the upper part of the first and second clamping arms. The extension frame is provided with a second lifting ring. The first and second lifting rings are connected by a first lifting chain. After the current transformer is hoisted, the first lifting chains on both sides are tilted in a figure-eight shape.

2. The hoisting tool for open-type substation primary equipment according to claim 1, characterized in that, The upper end of the flying arm is hinged to the side wall of the fixed frame. A leveling mechanism is provided on one side of the flying arm for leveling the fixed frame. The leveling mechanism includes a leveling cylinder, the cylinder seat of the leveling cylinder is hinged to the flying arm, and the piston rod of the leveling cylinder is hinged to the fixed frame.

3. The open-type substation primary equipment hoisting tooling of claim 1, wherein, The fixed frame contains a rotating body with an arc-shaped guide rail at its lower part. The fixed frame has an arc-shaped guide groove that slides with the arc-shaped guide rail. The first lifting ring is mounted on the rotating body. The rotating body has a limiting arc groove and an internal gear ring on its side wall. The frame also includes a rotating mechanism, which includes a motor fixedly mounted on the lower part of the fixed frame. The output shaft of the motor is located inside the limiting arc groove, and a gear is connected to the output shaft of the motor. The gear meshes with the internal gear ring.

4. The open-type substation primary equipment hoisting tooling of claim 1, wherein, The inner wall of the fixed frame is provided with a collision protection plate, which is made of rubber.

5. The open-type substation primary equipment hoisting tooling of claim 1, wherein, The clamping plate includes a fixed plate, and the extension frame is connected to the fixed plate at the upper end of the first clamping arm and the second clamping arm. The fixed plate has sliding grooves on both sides, and the bottom of the sliding groove has a through adjustment groove. An adjustment plate is slidably connected inside the sliding groove. The lower part of the adjustment plate has several adjustment rods, which pass through the adjustment groove and are threaded with fastening nuts. One end of the adjustment plate is connected to the first clamping arm or the second clamping arm through a pin.

6. The open-type substation primary equipment hoisting tooling of claim 5, wherein, The lower ends of the first and second clamping arms are both fitted with telescopic sleeves, and the lower clamping plates are installed on the telescopic sleeves. A second fixed seat is fixedly connected to the telescopic sleeves. The lower ends of the first and second clamping arms are both fixedly connected to the first fixed seat. An adjusting screw is rotatably connected to the first fixed seat. The adjusting screw is threadedly connected to the second fixed seat. The clamping plates at the lower ends of the first and second clamping arms are of equal or unequal height.

7. The hoisting tool for open-type substation primary equipment according to any one of claims 1-6, characterized in that, It also includes a bracket on which the current transformer is placed for secondary protection during the hoisting of the current transformer. The bracket includes a support plate with a fourth lifting ring on the support plate. The telescopic sleeve has a pull rod at its end and a third lifting ring at its lower end. The third and fourth lifting rings are connected by a second lifting chain. After the current transformer is hoisted, the second lifting chains on both sides are in a "V" shaped inclined state.

8. The open-type substation primary equipment hoisting tooling of claim 7, characterized in that, The telescopic sleeve is hinged to a threaded sleeve at its end, and the pull rod is threadedly connected to the threaded sleeve.

9. The open-type substation primary equipment hoisting tooling of claim 8, characterized in that, The support plate is provided with clearance holes, and the diameter of the clearance holes is larger than the bottom size of the current transformer. The support plate is also provided with several sleeves, and a support arm is slidably connected inside the sleeve. A locking bolt is threaded on the sleeve for locking after the support arm is extended or retracted.

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