CN117263053A - Hoisting device and hoisting method for current transformer - Google Patents

Abstract

The invention belongs to the technical field of transformer overhaul, and discloses a current transformer hoisting device and a hoisting method thereof, which are used for hoisting a current transformer in a switch cabinet. The current transformer lifting device comprises a base, a supporting frame, a fixing mechanism and a lifting mechanism. The base can move on the ground; the support frame is arranged on one surface of the base; the fixing mechanism is connected with the supporting frame, and the supporting frame can be connected with the cabinet plate at the periphery of the opening through the fixing component; the hoisting mechanism comprises a suspension arm, a connecting piece, a steel strand and a driving component, wherein the suspension arm is connected with one end of the support frame, which is far away from the base, in a sliding manner, the connecting piece is detachably connected with the current transformer, the suspension arm can move relative to the support frame along the length direction of the support frame so as to extend into the accommodating cavity from the opening, the steel strand is arranged on the suspension arm in a sliding manner along the length direction of the suspension arm, one end of the steel strand is connected with the connecting piece, the other end of the steel strand is connected with the driving component, and the driving component can drive the steel strand to move along the length direction of the suspension arm. The problem that the current transformer is difficult to install is solved.

Description

Hoisting device and hoisting method for current transformer

Technical Field

The invention relates to the technical field of transformer overhaul, in particular to a current transformer hoisting device and a hoisting method thereof.

Background

In the transformer overhauling work, overhauling the switch cabinet is a great importance, and in overhauling the switch cabinet, the current transformer is usually required to be replaced.

When the current transformer is replaced, maintenance personnel usually need to enter the switch cabinet to replace the current transformer, old current transformers are detached, and new current transformers are installed, because the space of part of the switch cabinet is narrow, the maintenance personnel cannot enter the switch cabinet well, so that the current transformer is difficult to lift to the installation position by force when being installed, the installation difficulty of the current transformer is high, operation accidents are easy to occur when the current transformer is replaced, and the maintenance personnel are injured.

Disclosure of Invention

The invention aims to provide a current transformer hoisting device, which solves the technical problem that when a current transformer is replaced, due to the narrow space in a switch cabinet, a maintainer is difficult to exert a force to lift the current transformer to an installation position when the current transformer is installed.

To achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a current transformer hoist device for hoist current transformer in the cubical switchboard, the cubical switchboard includes a plurality of cabinet boards, and is a plurality of the cabinet board can enclose to establish and form the holding chamber that has the opening, current transformer set up in the holding chamber, current transformer hoist device includes:

a base movable on the ground;

the support frame is arranged on one surface of the base;

the fixing mechanism is connected with the supporting frame, and the supporting frame can be connected with the cabinet plate on the periphery of the opening through the fixing assembly;

hoist and mount mechanism, including davit, connecting piece, steel strand wires and drive assembly, the davit with the support frame is kept away from the one end sliding connection of base, the connecting piece with current transformer can dismantle the connection, the davit can be for the support frame is followed self length direction and is removed in order to follow the opening stretches into the holding chamber, the steel strand wires are followed the length direction slip of davit set up in the davit, steel strand wires one end with the connecting piece is connected, the other end of steel strand wires with drive assembly connects, drive assembly can drive the steel strand wires are followed the length direction of davit removes.

Preferably, the support frame comprises a first support rod and a guide assembly, one end of the support frame is connected with the base, the other end of the support frame is connected with the guide assembly, and the suspension arm is in sliding connection with the guide assembly.

Preferably, the guide assembly comprises a pulley box and a plurality of guide pulleys, the guide pulleys are rotatably arranged on two sides in the pulley box, a sliding channel is formed between the guide pulleys on two sides, and the suspension arm is arranged in the sliding channel in a penetrating mode.

Preferably, the fixing mechanism comprises a second supporting rod, a connecting seat and a clamping assembly, the second supporting rod is detachably connected with the first supporting rod through the connecting seat, the second supporting rod is perpendicular to the first supporting rod, two ends of the second supporting rod are respectively provided with the clamping assembly, and the clamping assembly can be connected with the cabinet plate on the periphery of the opening.

Preferably, the first support rod is provided with a plurality of first connecting holes at uniform intervals along the axis of the first support rod, the second support rod is provided with a plurality of second connecting holes at uniform intervals along the axis of the second support rod, and the first connecting holes and the second connecting holes are connected with the connecting seat through bolts.

Preferably, the clamping assembly comprises a sliding seat, a clamping block, a positioning bolt and a clamping bolt, wherein the sliding seat is provided with a through hole, the second supporting rod penetrates through the through hole, the positioning bolt can selectively lock the sliding seat and the second supporting rod, the clamping block is connected with the sliding seat through the clamping bolt, and the cabinet plate can be clamped between the sliding seat and the clamping block when the clamping bolt is screwed.

Preferably, the positioning bolt is screwed with the second connecting hole to lock the sliding seat and the second supporting rod.

Preferably, an anti-slip pad is arranged at one end of the positioning bolt, which is close to the second support rod, and the anti-slip pad can be abutted with the second support rod when the positioning bolt is screwed down so as to lock the sliding seat and the second support rod.

Preferably, the driving assembly comprises a driving piece, a connecting frame and a winding roller, one end of the connecting frame is connected with the suspension arm, the other end of the connecting frame is rotationally connected with the winding roller, the steel strand is connected with the winding roller, and the driving piece is configured to drive the winding roller to rotate around the axis of the winding roller so as to recover or pay out the steel strand.

The invention aims to provide a hoisting method for solving the technical problem that when a current transformer is replaced, due to the fact that the space in a switch cabinet is narrow, an maintainer is difficult to exert force to lift the current transformer to an installation position when the current transformer is installed.

The hoisting method is completed by adopting the current transformer hoisting device and comprises the following steps:

s1, pushing a base to enable a current transformer lifting device to move to an opening of a switch cabinet, and connecting a fixing mechanism with a cabinet plate;

s2, connecting the current transformer with the connecting piece, enabling the steel strand to drive the current transformer to move along the vertical direction through the driving assembly, and adjusting the current transformer to be positioned at the height of the installation position;

s3, moving the suspension arm to enable one end of the suspension arm to extend into the accommodating cavity, and enabling the current transformer to move to the installation position along the length direction of the suspension arm.

The beneficial effects are that: the invention provides a current transformer lifting device which is used for lifting a current transformer in a switch cabinet. When installing current transformer, the base that can remove can make things convenient for maintainer to remove current transformer hoist device to the opening part of cubical switchboard, fix current transformer hoist device at the opening part of the cabinet body through fixed establishment, avoid hoist and mount in-process current transformer hoist device to take place to remove or empty, be connected alternating current inductor and connecting piece after fixing, and make the steel strand wires remove the position of adjusting current transformer through the driving piece, remove the davit at last, make the davit remove to the mounted position department in the holding chamber with current transformer, the technical problem that the maintainer is difficult to lift up the current transformer and install has avoided taking place the incident when installing current transformer.

The invention also provides a hoisting method, which is completed by adopting the current transformer hoisting device, a movable base can facilitate an maintainer to move the current transformer hoisting device to the opening of the switch cabinet, the current transformer hoisting device is fixed at the opening of the cabinet body through a fixing mechanism and is connected with a support frame, the current transformer hoisting device is prevented from moving or tilting in the hoisting process, an alternating current inductor is connected with a connecting piece after the fixing, a steel strand is moved through a driving piece to adjust the position of the current transformer, and finally, a suspension arm is moved, so that the suspension arm moves to the installation position in the accommodating cavity with the current transformer, the technical problem that the maintainer is difficult to lift the current transformer for installation is solved, the difficulty of replacing the current transformer is reduced, and the safety accident is avoided when the current transformer is installed.

Drawings

Fig. 1 is a schematic structural diagram of a current transformer lifting device provided by an embodiment of the invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

fig. 4 is a schematic flow chart of a hoisting method according to an embodiment of the present invention.

In the figure:

1. a base; 11. a bottom plate; 12. a universal wheel; 13. balancing weight;

2. a support frame; 21. a first support bar; 211. a first connection hole; 22. a guide assembly; 221. a pulley box; 222. a guide pulley;

3. a fixing mechanism; 31. a second support bar; 311. a second connection hole; 32. a connecting seat; 33. a clamping assembly; 331. a sliding seat; 332. a clamping block; 333. positioning bolts; 334. clamping bolts;

4. a hoisting mechanism; 41. a suspension arm; 42. a connecting piece; 43. steel strand; 44. a drive assembly; 441. a driving member; 442. a connecting frame; 443. a wind-up roll; 45. a bearing fixed pulley; 46. a guide fixed pulley; 47. and (3) a switch.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

When the current transformer is replaced, maintenance personnel usually need to enter the switch cabinet to replace the current transformer, old current transformers are detached, and new current transformers are installed, because the space of part of the switch cabinet is narrow, the maintenance personnel cannot enter the switch cabinet well, so that the current transformer is difficult to lift to the installation position by force when being installed, the installation difficulty of the current transformer is high, operation accidents are easy to occur when the current transformer is replaced, and the maintenance personnel are injured. The embodiment provides a current transformer lifting device to solve the above problem.

Example 1

Referring to fig. 1-3, the current transformer lifting device provided in this embodiment is used for lifting a current transformer in a switch cabinet, the switch cabinet includes a plurality of cabinet plates, the plurality of cabinet plates can enclose to form a containing cavity with an opening, and the current transformer is arranged in the containing cavity. This current transformer hoist device includes base 1, support frame 2, fixed establishment 3 and hoist mechanism 4, and fixed establishment 3 is connected fixedly with the cabinet board, and the rethread hoist mechanism 4 is hoisted current transformer, has solved the problem that is difficult to lift current transformer to the installation department when maintainer installs current transformer.

Specifically, the base 1 is movable on the ground; the support frame 2 is arranged on one surface of the base 1; the fixing mechanism 3 is connected with the support frame 2, and the support frame 2 can be connected with the cabinet plate at the periphery of the opening through the fixing component; the hoisting mechanism 4 comprises a suspension arm 41, a connecting piece 42, a steel strand 43 and a driving component 44, wherein the suspension arm 41 is slidably connected with one end, far away from the base 1, of the support frame 2, the connecting piece 42 is detachably connected with the current transformer, the suspension arm 41 can move along the length direction of the support frame 2 so as to extend into the accommodating cavity from the opening, the steel strand 43 is slidably arranged on the suspension arm 41 along the length direction of the suspension arm 41, one end of the steel strand 43 is connected with the connecting piece 42, the other end of the steel strand 43 is connected with the driving component 44, and the driving component 44 can drive the steel strand 43 to move along the length direction of the suspension arm 41.

When installing current transformer, base 1 that can remove can make things convenient for maintainer to remove current transformer hoist device to the opening part of cubical switchboard, fix current transformer hoist device at the opening part of the cabinet body through fixed establishment 3, avoid hoist and mount in-process current transformer hoist device to take place to remove or empty, be connected alternating current inductor and connecting piece 42 after fixing, and make steel strand wires 43 remove the position of adjusting current transformer through driving piece 441, remove davit 41 at last, make davit 41 remove to the mounted position department in the holding chamber with the current transformer, the technical problem that the maintainer is difficult to lift up the current transformer and installs has been solved, the incident takes place when installing the current transformer.

Specifically, base 1 includes bottom plate 11, universal wheel 12 and balancing weight 13, and the bottom surface of bottom plate 11 is connected with universal wheel 12, makes things convenient for maintainer to promote current transformer hoist device and removes to the operation position subaerial, and balancing weight 13 sets up in the top surface of bottom plate 11, can increase current transformer hoist device's stability degree, avoids causing empting when lifting by crane current transformer.

The kind of the connecting piece 42 is not limited herein, in this embodiment, the connecting piece 42 is a hook, and in the hoisting operation, the current transformer is bound with the binding band, and then the binding band is connected with the hook.

The support frame 2 includes first bracing piece 21 and direction subassembly 22, and support frame 2 one end is connected with base 1, and the support frame 2 other end is connected with direction subassembly 22, and davit 41 and direction subassembly 22 sliding connection, direction subassembly 22 can make self axis move accurately to make the removal of davit 41 stable smooth.

Specifically, the guide assembly 22 includes a pulley box 221 and a plurality of guide pulleys 222, the plurality of guide pulleys 222 are rotatably disposed at two sides in the pulley box 221, the guide pulleys 222 at two sides form a sliding channel, the boom 41 is disposed in the sliding channel in a penetrating manner, and when the boom 41 moves, the guide pulleys 222 rotate to convert sliding friction into rolling friction, so that the boom 41 moves smoothly.

The number of the guide pulleys 222 is not limited, in this embodiment, four guide pulleys 222 are provided, two guide pulleys are provided on both sides of the inside of the pulley box 221, and in other embodiments, the number of the guide pulleys 222 is set according to the size of the boom 41 and the size of the pulley box 221.

The fixed establishment 3 includes second bracing piece 31, connecting seat 32 and clamping assembly 33, and second bracing piece 31 passes through connecting seat 32 with first bracing piece 21 and can dismantle the connection, makes things convenient for current transformer hoist device's installation and dismantlement, and second bracing piece 31 sets up with first bracing piece 21 perpendicularly, makes stable in structure, and the both ends of second bracing piece 31 all are provided with a clamping assembly 33, and clamping assembly 33 can be connected with the cabinet board of opening week side, makes support frame 2 and hoist mechanism 4 keep stationary for the cubical switchboard, ensures the stability of hoist and mount in-process.

The number of the second support rods 31 is not limited herein, and in this embodiment, two second support rods 31 are provided, and are uniformly spaced along the axis of the first support rod 21, so as to enhance the connection firmness.

Specifically, the first supporting rod 21 is provided with a plurality of first connecting holes 211 along the axis of the first supporting rod at even intervals, the second supporting rod 31 is provided with a plurality of second connecting holes 311 along the axis of the second supporting rod at even intervals, the first connecting holes 211 and the second connecting holes 311 are connected with the connecting seat 32 through bolts, the connection is firm, the disassembly is convenient, the relative positions of the first supporting rod 21 and the second supporting rod 31 can be adjusted according to the actual use condition, and the hoisting operation is convenient.

Specifically, a connecting groove is provided, the first supporting rod 21 is arranged in the connecting groove in a penetrating manner, and groove walls on two sides of the connecting groove are connected with the first connecting hole 211 through bolts.

The clamping assembly 33 comprises a sliding seat 331, a clamping block 332, a positioning bolt 333 and a clamping bolt 334, wherein the sliding seat 331 is provided with a through hole, the second supporting rod 31 is penetrated through the through hole, the positioning bolt 333 can selectively lock the sliding seat 331 and the second supporting rod 31, the clamping block 332 is connected with the sliding seat 331 through the clamping bolt 334, and the cabinet plate can be clamped between the sliding seat 331 and the clamping block 332 when the clamping bolt 334 is screwed.

Specifically, the positioning bolt 333 is screwed with the second connecting hole 311 to lock the sliding seat 331 and the second supporting rod 31, so that the connection is stable and the movement is not easy.

The driving component 44 comprises a driving member 441, a connecting frame 442 and a winding roller 443, one end of the connecting frame 442 is connected with the suspension arm 41, the other end of the connecting frame 442 is rotationally connected with the winding roller 443, the steel strand 43 is connected with the winding roller 443, the driving member 441 is configured to drive the winding roller 443 to rotate around the axis of the driving member 441 to recover or pay out the steel strand 43, manual winding and unwinding are avoided, and the difficulty of hoisting operation is further reduced.

Specifically, the suspension arm 41 is provided with a cavity penetrating along the length direction of the suspension arm 41, one end of the steel strand 43 is connected with the winding roller 443, the other end of the steel strand passes through the cavity connecting piece 42, the hoisting mechanism 4 further comprises a bearing fixed pulley 45 and a guiding fixed pulley 46, the bearing fixed pulley 45 and the guiding fixed pulley 46 are respectively arranged at two ends of the suspension arm 41, the guiding fixed pulley 46 is arranged at one end, close to the winding roller 443, of the suspension arm 41, the bearing fixed pulley 45 is arranged at one end, far away from the winding roller 443, of the steel strand 43, the steel strand 43 is erected on the guiding fixed pulley 46 and the bearing fixed pulley 45, the steel strand 43 is moved smoothly, the steel strand 43 is prevented from being worn by the suspension arm 41, and the service life of the steel strand 43 is prolonged.

The specific type of the driving member 441 is not limited herein, in this embodiment, the driving member 441 is a motor, and an output end of the motor is connected to an axis of the winding roller 443 to drive the winding roller 443 to rotate.

Further, the driving assembly 44 further includes a switch 47, the switch 47 is electrically connected to the driving member 441, and the switch 47 is configured to control the motor to drive the winding roller 443 to rotate forward, backward or stop rotating, so as to facilitate accurate hovering of the current transformer at the installation position.

Referring to fig. 4, this embodiment further provides a hoisting method, which is completed by adopting the current transformer hoisting device, and includes:

s1, pushing a base 1 to enable a current transformer lifting device to move to an opening of a switch cabinet, and connecting a fixing mechanism 3 with a cabinet plate;

s2, connecting the current transformer with the connecting piece 42, enabling the steel stranded wires 43 to drive the current transformer to move in the vertical direction through the driving assembly 44, and adjusting the current transformer to be located at the installation position;

s3, moving the suspension arm 41 to enable one end of the suspension arm 41 to extend into the accommodating cavity, and enabling the current transformer to move to the installation position along the length direction of the suspension arm 41.

The base 1 that can remove can make things convenient for maintainer to remove current transformer hoist device to the opening part of cubical switchboard, fix current transformer hoist device at the opening part of the cabinet body and connect support frame 2 through fixed establishment 3, avoid hoist and mount in-process current transformer hoist device to take place to remove or empty, be connected alternating current inductor and connecting piece 42 after fixing, and make steel strand wires 43 remove the position of adjusting current transformer through driving piece 441, remove davit 41 at last, make davit 41 remove to the mounted position department in the holding chamber with current transformer, the technical problem that the maintainer is difficult to lift up the current transformer and installs has been solved, the degree of difficulty of changing the current transformer has been reduced, the incident takes place when the installation current transformer has been avoided.

Specifically, the movable base 1 is used to push the current transformer lifting device to the opening of the switch cabinet, the sliding seat 331 formed by unscrewing the positioning bolt 333 can drive the clamping block 332 to move along the length direction of the second supporting rod 31, when the cabinet board at the opening is located between the clamping block 332 and the sliding seat 331, the clamping bolt 334 is screwed to clamp the cabinet board between the clamping block 332 and the sliding seat 331, and the other clamping blocks 332 and the sliding seat 331 are connected with the cabinet board according to the operation. After the connection is stable, the current transformer to be replaced is connected with the connecting piece 42, the winding roller 443 is driven to rotate by the driving piece 441, the height of the current transformer is approximately at the height of the installation position in the switch cabinet, the boom 41 is pushed to move into the accommodating cavity after the height is adjusted, the current transformer is positioned at the installation position, and the position of the current transformer can be finely adjusted through the switch 47, so that the current transformer is accurately positioned at the installation position.

Example two

The embodiment provides a current transformer lifting device, wherein parts which are the same as or corresponding to those in the first embodiment adopt corresponding reference numerals. For simplicity, only the points of distinction between the second embodiment and the first embodiment will be described. The difference is that the positioning bolt 333 is provided with a non-slip pad (not shown in the figure) near one end of the second support rod 31, and when the positioning bolt 333 is screwed down, the non-slip pad can be abutted against the second support rod 31 to lock the movable seat and the second support rod 31, so that the sliding seat 331 and the clamping block 332 can form stepless adjustment relative to the second support rod 31, and can be better adapted to switch cabinets with different sizes.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a current transformer hoist device for hoist current transformer in the cubical switchboard, the cubical switchboard includes a plurality of cabinet boards, and is a plurality of the cabinet board can enclose to establish and form the holding chamber that has the opening, current transformer set up in the holding chamber, its characterized in that, current transformer hoist device includes:

a base (1) movable on the ground;

the support frame (2) is arranged on one surface of the base (1);

the fixing mechanism (3) is connected with the supporting frame (2), and the supporting frame (2) can be connected with the cabinet plate on the periphery of the opening through the fixing assembly;

hoist mechanism (4), including davit (41), connecting piece (42), steel strand wires (43) and drive assembly (44), davit (41) with support frame (2) are kept away from the one end sliding connection of base (1), connecting piece (42) with current transformer can dismantle the connection, davit (41) can for support frame (2) follow self length direction removes in order to follow the opening stretches into the holding chamber, steel strand wires (43) are followed length direction slip of davit (41) set up in davit (41), steel strand wires (43) one end with connecting piece (42) are connected, the other end of steel strand wires (43) with drive assembly (44) are connected, drive assembly (44) can drive steel strand wires (43) are followed length direction of davit (41) removes.

2. The current transformer lifting device according to claim 1, wherein the supporting frame (2) comprises a first supporting rod (21) and a guiding component (22), one end of the supporting frame (2) is connected with the base (1), the other end of the supporting frame (2) is connected with the guiding component (22), and the suspension arm (41) is in sliding connection with the guiding component (22).

3. The current transformer lifting device according to claim 2, wherein the guiding assembly (22) comprises a pulley box (221) and a plurality of guiding pulleys (222), the guiding pulleys (222) are rotatably arranged on two sides in the pulley box (221), sliding channels are formed between the guiding pulleys (222) on two sides, and the suspension arm (41) is arranged in the sliding channels in a penetrating mode.

4. The current transformer lifting device according to claim 2, wherein the fixing mechanism (3) comprises a second supporting rod (31), a connecting seat (32) and a clamping assembly (33), the second supporting rod (31) is detachably connected with the first supporting rod (21) through the connecting seat (32), the second supporting rod (31) is vertically arranged with the first supporting rod (21), two ends of the second supporting rod (31) are respectively provided with one clamping assembly (33), and the clamping assembly (33) can be connected with the cabinet plate on the periphery of the opening.

5. The current transformer lifting device according to claim 4, wherein the first supporting rods (21) are uniformly provided with a plurality of first connecting holes (211) at intervals along the axis of the first supporting rods, the second supporting rods (31) are uniformly provided with a plurality of second connecting holes (311) at intervals along the axis of the second supporting rods, and the first connecting holes (211) and the second connecting holes (311) are connected with the connecting seat (32) through bolts.

6. The current transformer lifting device according to claim 5, wherein the clamping assembly (33) comprises a sliding seat (331), a clamping block (332), a positioning bolt (333) and a clamping bolt (334), the sliding seat (331) is provided with a through hole, the second supporting rod (31) is arranged in the through hole in a penetrating mode, the positioning bolt (333) can selectively lock the sliding seat (331) and the second supporting rod (31), the clamping block (332) is connected with the sliding seat (331) through the clamping bolt (334), and the cabinet plate can be clamped between the sliding seat (331) and the clamping block (332) when the clamping bolt (334) is screwed down.

7. The current transformer lifting device according to claim 6, wherein the positioning bolt (333) is screwed with the second connection hole (311) to lock the sliding seat (331) and the second support rod (31).

8. The current transformer lifting device according to claim 6, wherein an end of the positioning bolt (333) close to the second support rod (31) is provided with a non-slip pad, and the non-slip pad can be abutted with the second support rod (31) when the positioning bolt (333) is screwed down so as to lock the sliding seat (331) and the second support rod (31).

9. The current transformer lifting device according to any one of claims 1-8, wherein the driving assembly (44) comprises a driving member (441), a connecting frame (442) and a winding roller (443), one end of the connecting frame (442) is connected with the suspension arm (41), the other end of the connecting frame (442) is rotatably connected with the winding roller (443), the steel strand (43) is connected with the winding roller (443), and the driving member (441) is configured to drive the winding roller (443) to rotate around its own axis to recover or pay out the steel strand (43).

10. Hoisting method, completed by the current transformer hoisting device according to any one of claims 1-9, comprising:

s1, pushing a base (1) to enable a current transformer lifting device to move to an opening of a switch cabinet, and connecting a fixing mechanism (3) with a cabinet plate;

s2, connecting the current transformer with a connecting piece (42), driving the current transformer to move in the vertical direction by a steel strand (43) through a driving assembly (44), and adjusting the current transformer to the height of the current transformer at the installation position;

s3, moving the suspension arm (41) to enable one end of the suspension arm (41) to extend into the accommodating cavity, and enabling the current transformer to move to the installation position along the length direction of the suspension arm (41).