Transformer on-load tap-changer hoisting device and use method thereof

Abstract

The invention discloses a transformer on-load tap-changer hoisting device and a use method thereof, relates to the technical field of on-load tap-changer hoisting devices, and aims to solve the problems that hoisting devices in the prior art are mostly of an integrated structure or welded connection for the stability of the hoisting devices, an on-load tap-changer needs to be hoisted only during maintenance and cleaning, and when hoisting operation is not carried out, hoisting is not needed. Due to the problem that the transformer occupies a large space during large-size storage, a transformer is arranged below the hoisting device body, six hoisting device bodies are symmetrically arranged at the lower end of the hoisting device body front and back, supporting hoppers are arranged at the upper ends of the hoisting device bodies, and supporting arches are installed above the supporting hoppers. A transverse supporting column is mounted above the supporting arch, a longitudinal supporting column is mounted above the supporting arch, a mounting plate is mounted above the transverse supporting column, electric hoists are symmetrically mounted below the mounting plate, and hoisting connecting mechanisms are arranged below the electric hoists.

Description

Technical Field

[0001] The invention relates to the technical field of on-load tap changer hoisting devices, in particular to a transformer on-load tap changer hoisting device and a use method thereof. Background Art

[0002] The transformer on-load tap changer is a voltage regulating device suitable for operating under transformer excitation or load to change the connection position of the transformer winding tap. The basic principle of the on-load tap changer is to switch between the taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and finally achieving the purpose of voltage regulation. Its operation process must meet two basic conditions: one is to ensure that the current is continuous during the switching process; the other is to ensure that there is no short circuit between the taps. Therefore, in the process of switching taps, it is necessary to connect two taps at the same time at a certain moment to ensure the continuity of the load current, and impedance must be connected in series between the two taps of the bridge to limit the circulating current and prevent the occurrence of short circuit between the taps. The transformer on-load tap changer lifting device is a device specially used for lifting the transformer on-load tap changer. The design and use of this device is intended to solve the problem of difficulty in lifting the indoor transformer on-load tap changer during maintenance, replacement or installation. The transformer on-load tap changer lifting device usually consists of a base, a first column, a second column, a beam, a beam trolley and a hook. The lifting device can ensure that during the lifting process of the on-load tap changer, damage to the transformer body and other components is avoided, while ensuring the safety of the operators.

[0003] The Chinese patent publication number is CN108217455A, which discloses a load-on tap changer hoisting machine, aiming to solve the technical problem of the difficulty in maintaining the load-on tap changer in the prior art. The load-on tap changer hoisting machine provided by the present invention includes a base, a column is arranged on the base, a crossbeam is arranged on the column, a lever hoist is arranged on the crossbeam, and the base is fixed on the transformer. When lifting the load-on tap changer, the lever hoist can be conveniently used for lifting. Since the crossbeam is rotatably connected to the column, the load-on tap changer can be conveniently placed in a suitable position after being lifted out of the oil tank. In actual use, this solution can effectively prevent the relevant components of the load-on tap changer from contacting the power grid during the lifting process, which is conducive to the maintenance of the load-on tap changer and reduces the safety hazards during the maintenance of the load-on tap changer. The hoisting machine is installed on the transformer, which reduces the space occupied by the hoisting machine, and the hoisting machine has good general performance.

[0004] The above-mentioned prior art solutions have the following defects: the hoisting devices in the prior art are mostly integrated structures or welded connections for their stability. The on-load tap changer needs to be hoisted only for maintenance and cleaning. When not hoisted, it takes up a large space when stored due to its large size. Therefore, we propose a transformer on-load tap changer hoisting device and a method of using it to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a transformer on-load tap changer lifting device and a method for using the same, so as to solve the problem that the lifting devices in the prior art proposed in the above background technology are mostly integrated structures or welded connections for their stability, and the on-load tap changer only needs to be lifted for maintenance and cleaning. When not lifted, it occupies a large space when stored due to its large size.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a transformer on-load tap changer lifting device, comprising a lifting device body, a transformer is arranged below the lifting device body, six lifting device bodies are symmetrically arranged front and back at the lower end of the lifting device body, a support bucket is arranged at the upper end of the lifting device body, a support arch is installed above the support bucket, a transverse support column is installed above the support arch, a longitudinal support column is installed above the support arch, a mounting plate is installed above the transverse support column, an electric hoist is symmetrically installed below the mounting plate, a lifting connection mechanism is arranged below the electric hoist, a load tap changer is lifted below the lifting connection mechanism, and two of the electric hoists are movably connected to the lifting connection mechanism through a hook.

[0007] Preferably, the transverse support column is vertically arranged with the longitudinal support column, the lower end of the support column on one side is located above the transformer, square positioning blocks are respectively arranged at the four corners above the support bucket, and support arch grooves are opened between the four positioning blocks.

[0008] Preferably, the support arch is a cross structure, the support arch is matched with the support arch groove, and a connecting bucket is provided at the upper end of the support arch.

[0009] Preferably, a mounting slot is provided at a middle position inside the upper end of the connecting bucket, the mounting slot is a convex slot, and the transverse support column and the longitudinal support column are respectively slidably connected to the mounting slot.

[0010] Preferably, the support arch and the support bucket are fixedly connected by bolts, longitudinal support column grooves are opened on both sides and the middle position of the transverse support column, the longitudinal support column grooves are slidingly connected to the longitudinal support column, the upper end of the transverse support column is symmetrically opened with a first limit groove, and the upper end of the longitudinal support column is symmetrically opened with a second limit groove.

[0011] Preferably, a limiting mechanism is installed above both ends of the transverse support column and the longitudinal support column, and limiting mechanism limiting blocks are symmetrically arranged inside the limiting mechanism, and the limiting mechanism limiting blocks are slidably connected to the first limiting groove and the second limiting groove respectively.

[0012] Preferably, a first support column groove is opened on the outer side of the interior of the limiting mechanism, the first support column groove is a mountain-shaped structure, and the first support column groove is slidably connected to both ends of the transverse support column and the longitudinal support column respectively.

[0013] Preferably, two groups of mounting plate limit blocks are symmetrically installed at the front and rear ends of the mounting plate, and each group of the mounting plate limit blocks has two.

[0014] Preferably, the mounting plate limit block is slidably connected to the first limit groove and the second limit groove respectively, and a second support column groove is opened on one side of the mounting plate limit block, and the second support column groove is respectively adapted to the transverse support column and the longitudinal support column.

[0015] A method for using a transformer on-load tap changer lifting device comprises the following steps:

[0016] Step 1: Splice the support column and the transverse support column, place the support arch above the support bucket and fix it with bolts, slide the transverse support column and the installation slide groove of the connecting bucket, let the two ends of the transverse support column extend to the outside of the installation slide groove, install the limit mechanism above the two ends of the transverse support column, make the limit block of the limit mechanism correspond to the first limit groove, the first support column groove corresponds to the transverse support column, press the limit mechanism downward to make the limit mechanism and the transverse support column clamped;

[0017] Step 2: Pass the longitudinal support column through the installation slot of the connecting bucket and the longitudinal support column slot in sequence, so that both ends of the longitudinal support column extend to the outside of the installation slot, install the limiting mechanism above both ends of the longitudinal support column, make the limiting block of the limiting mechanism correspond to the second limiting slot, and the first support column slot correspond to the longitudinal support column, press the limiting mechanism downward to make the limiting mechanism engage with the longitudinal support column;

[0018] Step 3: Align the mounting plate limit block of the mounting plate with the first limit groove and install them in a suitable manner, so that the mounting plate is clamped on the top of the horizontal support column, and the electric hoist is installed on the top of the mounting plate;

[0019] Step 4: During hoisting, connect the electric hoist to the hoisting connection mechanism through a hook, drive the electric hoist horizontally through the driving mechanism above the electric hoist, so that the hoisting connection mechanism is located above the on-load tap-changer of the transformer, lower the hoisting connection mechanism through the electric hoist, connect it to the on-load tap-changer through the hook, lift the on-load tap-changer by retracting the wire rope through the electric hoist, and then drive it to one side of the transformer through the driving mechanism above the electric hoist. When the on-load tap-changer is misaligned with the transformer, lower the on-load tap-changer through the electric hoist, and untie the hook connection between the on-load tap-changer and the hoisting connection mechanism. The setting of two electric hoists makes the hoisting connection mechanism evenly stressed, which is more stable than hoisting with one electric hoist. A hook corresponding to the lifting ring of the on-load tap-changer is provided below the hoisting connection mechanism, so that the connection between the on-load tap-changer and the hoisting connection mechanism is more stable after the on-load tap-changer is lifted.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When installing the present invention, the support column and the transverse support column are spliced, the support arch is placed above the support bucket and fixedly connected by bolts, the transverse support column is slidably connected to the installation slide groove of the on-load tap changer, and the two ends of the transverse support column are extended to the outside of the installation slide groove, and the limit mechanism is installed above the two ends of the transverse support column, and the limit block of the limit mechanism is matched with the first limit groove, and the first support column groove is matched with the transverse support column, and the limit mechanism is pressed downward to make the limit mechanism and the transverse support column clamped, and the longitudinal support column is sequentially passed through the installation slide groove of the on-load tap changer and the longitudinal support column groove, and the two ends of the longitudinal support column are extended. To the outside of the installation slide, install the limit mechanism above the two ends of the longitudinal support column, correspond the limit block of the limit mechanism to the second limit slot, correspond the first support column slot to the longitudinal support column, press the limit mechanism downward to make the limit mechanism and the longitudinal support column snap-fit, correspond the mounting plate limit block of the mounting plate to the first limit slot and adapt and install, so that the mounting plate is snap-fitted to the top of the transverse support column, which solves the problem that the lifting devices in the prior art are mostly integrated structures or welded connections for their stability, and the on-load tap changer only needs to be lifted for maintenance and cleaning. When not lifted, it takes up a lot of space when stored due to its large size.

[0022] 2. During hoisting, connect the electric hoist to the hoisting connection mechanism through a hook, drive the electric hoist horizontally through the driving mechanism above the electric hoist, so that the hoisting connection mechanism is located above the on-load tap-changer of the transformer, lower the hoisting connection mechanism through the electric hoist, connect it to the on-load tap-changer through the hook, lift the on-load tap-changer by retracting the wire rope through the electric hoist, and then drive it to one side of the transformer through the driving mechanism above the electric hoist. When the on-load tap-changer is misaligned with the transformer, lower the on-load tap-changer through the electric hoist, and untie the hook connection between the on-load tap-changer and the hoisting connection mechanism. The setting of two electric hoists makes the hoisting connection mechanism evenly stressed, which is more stable than hoisting with one electric hoist. A hook corresponding to the lifting ring of the on-load tap-changer is arranged below the hoisting connection mechanism, so that the connection between the on-load tap-changer and the hoisting connection mechanism is more stable after the on-load tap-changer is lifted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the present invention;

[0024] Figure 2 is a side view of the present invention;

[0025] Figure 3 For the present invention Figure 1 A partial enlarged view of area A;

[0026] Figure 4 A diagram showing the connection relationship between the support arch and the support bucket in the present invention;

[0027] Figure 5 It is a partial stereoscopic diagram of the transverse support column in the present invention;

[0028] Figure 6 It is a partial stereoscopic diagram of the longitudinal support column in the present invention;

[0029] Figure 7 It is a three-dimensional diagram of the limiting mechanism in the present invention;

[0030] Figure 8 is a three-dimensional diagram of the support arch in the present invention;

[0031] Fig. 9 A three-dimensional diagram of the on-load tap changer of the present invention;

[0032] Fig.10 It is a three-dimensional diagram of the mounting plate in the present invention.

[0033] In the figure: 1. lifting device body; 2. support column; 3. horizontal support column; 4. longitudinal support column; 5. mounting plate; 6. support arch; 7. support bucket; 8. on-load tap changer; 9. electric hoist; 10. lifting connection mechanism; 11. limit mechanism; 12. installation slide; 13. longitudinal support column slot; 14. first limit slot; 15. second limit slot; 16. limit block of limit mechanism; 17. first support column slot; 18. positioning block; 19. support arch slot; 20. mounting plate limit block; 21. second support column slot; 22. transformer; 23. connecting bucket. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] See also Figure 1-10 An embodiment of the present invention is as follows: a transformer on-load tap changer lifting device comprises a lifting device body 1, a transformer 22 is arranged below the lifting device body 1, six lifting device bodies 1 are symmetrically arranged front and back at the lower end of the lifting device body 1, a supporting bucket 7 is arranged at the upper end of the lifting device body 1, a supporting arch 6 is installed above the supporting bucket 7, a transverse supporting column 3 is installed above the supporting arch 6, a longitudinal supporting column 4 is installed above the supporting arch 6, a mounting plate 5 is installed above the transverse supporting column 3, an electric hoist 9 is symmetrically installed below the mounting plate 5, a lifting connection mechanism 10 is arranged below the electric hoist 9, an on-load tap changer 8 is lifted below the lifting connection mechanism 10, and two electric hoists 9 are movably connected to the lifting connection mechanism 10 through a hook.

[0036] Splice the support column 2 and the transverse support column 3, place the support arch 6 above the support bucket 7 and fix it with bolts, slide the transverse support column 3 and the installation slide groove 12 of the connecting bucket 23, let the two ends of the transverse support column 3 extend to the outside of the installation slide groove 12, install the limit mechanism 11 above the two ends of the transverse support column 3, make the limit block 16 of the limit mechanism correspond to the first limit groove 14, and the first support column groove 17 correspond to the transverse support column 3, press the limit mechanism 11 downward to make the limit mechanism 11 and the transverse support column 3 clamped; pass the longitudinal support column 4 through the connecting bucket 23 in sequence. Install the slide groove 12 and the longitudinal support column groove 13, let the two ends of the longitudinal support column 4 extend to the outside of the installation slide groove 12, install the limiting mechanism 11 above the two ends of the longitudinal support column 4, and make the limiting block 16 of the limiting mechanism correspond to the second limiting groove 15, and the first support column groove 17 correspond to the longitudinal support column 4, press the limiting mechanism 11 downward to make the limiting mechanism 11 and the longitudinal support column 4 clamped; make the mounting plate limiting block 20 of the mounting plate 5 correspond to the first limiting groove 14 and adapt and install it, let the mounting plate 5 be clamped above the transverse support column 3, and install the electric hoist 9 above the mounting plate 5.

[0037] See also Figure 3-6 , the transverse support column 3 and the longitudinal support column 4 are arranged vertically, the lower end of the support column 2 on one side is located above the transformer 22, and the four corners above the support bucket 7 are respectively provided with square positioning blocks 18, and a support arch groove 19 is provided between the four positioning blocks 18. The support arch 6 is a cross structure, the support arch 6 is adapted to the support arch groove 19, and a connecting bucket 23 is provided at the upper end of the support arch 6. An installation slide groove 12 is provided at the middle position inside the upper end of the connecting bucket 23, and the installation slide groove 12 is a convex groove, and the transverse support column 3 and the longitudinal support column 4 are respectively slidably connected with the installation slide groove 12.

[0038] See also Figure 5-9 The support arch 6 and the support bucket 7 are fixedly connected by bolts. Longitudinal support column grooves 13 are provided on both sides and the middle of the transverse support column 3. The longitudinal support column grooves 13 are slidably connected with the longitudinal support column 4. The upper end of the transverse support column 3 is symmetrically provided with a first limiting groove 14, and the upper end of the longitudinal support column 4 is symmetrically provided with a second limiting groove 15. A limiting mechanism 11 is installed above both ends of the transverse support column 3 and the longitudinal support column 4. The limiting mechanism 11 has symmetrically arranged limiting blocks 16 of the limiting mechanism inside. The limiting blocks 16 of the limiting mechanism are slidably connected with the first limiting groove 14 and the second limiting groove 15, respectively. A first support column groove 17 is provided on the outer side of the limiting mechanism 11. The first support column groove 17 is a mountain-shaped structure. The first support column groove 17 is slidably connected with both ends of the transverse support column 3 and the longitudinal support column 4, respectively.

[0039] See also Fig.10Two sets of mounting plate limit blocks 20 are symmetrically installed at the front and rear ends of the mounting plate 5, and each set of mounting plate limit blocks 20 has two. The mounting plate limit blocks 20 are slidably connected to the first limit groove 14 and the second limit groove 15 respectively, and a second support column groove 21 is opened on one side of the mounting plate limit block 20, and the second support column groove 21 is respectively adapted to the transverse support column 3 and the longitudinal support column 4.

[0040] A method for using a transformer on-load tap changer lifting device comprises the following steps:

[0041] Step 1: Splice the support column 2 and the transverse support column 3, place the support arch 6 above the support bucket 7 and fix it with bolts, slide the transverse support column 3 and the installation slot 12 of the connecting bucket 23, let the two ends of the transverse support column 3 extend to the outside of the installation slot 12, install the limiting mechanism 11 above the two ends of the transverse support column 3, make the limiting block 16 of the limiting mechanism correspond to the first limiting slot 14, the first support column slot 17 corresponds to the transverse support column 3, press the limiting mechanism 11 downward to make the limiting mechanism 11 and the transverse support column 3 clamped;

[0042] Step 2: Pass the longitudinal support column 4 through the installation slot 12 and the longitudinal support column slot 13 of the connecting bucket 23 in sequence, so that both ends of the longitudinal support column 4 extend to the outside of the installation slot 12, install the limiting mechanism 11 above both ends of the longitudinal support column 4, make the limiting block 16 of the limiting mechanism correspond to the second limiting slot 15, and the first support column slot 17 correspond to the longitudinal support column 4, press the limiting mechanism 11 downward to make the limiting mechanism 11 and the longitudinal support column 4 clamped;

[0043] Step 3: Align the mounting plate limit block 20 of the mounting plate 5 with the first limit groove 14 and adapt and install them, so that the mounting plate 5 is clamped on the top of the transverse support column 3, and the electric hoist 9 is installed on the top of the mounting plate 5;

[0044] Step 4: During hoisting, connect the electric hoist 9 to the hoisting connection mechanism 10 through a hook, drive the electric hoist 9 horizontally through the driving mechanism above the electric hoist 9, so that the hoisting connection mechanism 10 is located above the on-load tap changer 8 of the transformer 22, lower the hoisting connection mechanism 10 through the electric hoist 9, connect it to the on-load tap changer 8 through the hook, retract the wire rope through the electric hoist 9 to lift the on-load tap changer 8, and then drive it to one side of the transformer 22 through the driving mechanism above the electric hoist 9. When the on-load tap changer 8 is misaligned with the transformer 22, lower the on-load tap changer 8 through the electric hoist 9, and untie the hook connection between the on-load tap changer 8 and the hoisting connection mechanism 10. The setting of two electric hoists 9 makes the hoisting connection mechanism 10 evenly stressed, which is more stable than hoisting with one electric hoist 9. A hook corresponding to the lifting ring of the on-load tap changer 8 is provided below the hoisting connection mechanism 10, so that the connection between the on-load tap changer 8 and the hoisting connection mechanism 10 is more stable after the on-load tap changer 8 is lifted.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A transformer on-load tap changer lifting device, comprising a lifting device body (1), characterized in that: A transformer (22) is arranged below the lifting device body (1), six lifting device bodies (1) are symmetrically arranged at the front and rear ends of the lower end of the lifting device body (1), a support bucket (7) is arranged at the upper end of the lifting device body (1), a support arch (6) is installed above the support bucket (7), a transverse support column (3) is installed above the support arch (6), a longitudinal support column (4) is installed above the support arch (6), a mounting plate (5) is installed above the transverse support column (3), an electric hoist (9) is symmetrically installed below the mounting plate (5), a lifting connection mechanism (10) is arranged below the electric hoist (9), a load tap changer (8) is lifted below the lifting connection mechanism (10), and two electric hoists (9) are movably connected to the lifting connection mechanism (10) through a hook.

2. A transformer on-load tap changer hoisting device according to claim 1, characterized in that: The transverse support column (3) and the longitudinal support column (4) are arranged vertically, the lower end of the support column (2) on one side is located above the transformer (22), and four square positioning blocks (18) are respectively arranged at the four corners above the support bucket (7), and support arch grooves (19) are opened between the four positioning blocks (18).

3. A transformer on-load tap changer hoisting device according to claim 2, characterized in that: The support arch (6) is a cross structure, the support arch (6) is matched with the support arch groove (19), and a connecting bucket (23) is provided at the upper end of the support arch (6).

4. A transformer on-load tap changer hoisting device according to claim 3, characterized in that: A mounting slide groove (12) is provided at a middle position inside the upper end of the connecting bucket (23), wherein the mounting slide groove (12) is a convex groove, and the transverse support column (3) and the longitudinal support column (4) are respectively slidably connected to the mounting slide groove (12).

5. The transformer on-load tap changer hoisting device according to claim 4, characterized in that: The support arch (6) and the support bucket (7) are fixedly connected by bolts, longitudinal support column grooves (13) are provided on both sides and in the middle of the transverse support column (3), the longitudinal support column grooves (13) are slidably connected to the longitudinal support column (4), the upper end of the transverse support column (3) is symmetrically provided with a first limiting groove (14), and the upper end of the longitudinal support column (4) is symmetrically provided with a second limiting groove (15).

6. A transformer on-load tap changer hoisting device according to claim 5, characterized in that: A limiting mechanism (11) is installed above both ends of the transverse support column (3) and the longitudinal support column (4), and limiting mechanism limiting blocks (16) are symmetrically arranged inside the limiting mechanism (11), and the limiting mechanism limiting blocks (16) are slidably connected to the first limiting groove (14) and the second limiting groove (15) respectively.

7. A transformer on-load tap changer hoisting device according to claim 6, characterized in that: A first support column groove (17) is provided on the outer side of the interior of the limiting mechanism (11); the first support column groove (17) is a mountain-shaped structure; the first support column groove (17) is slidably connected to both ends of the transverse support column (3) and the longitudinal support column (4).

8. The transformer on-load tap changer hoisting device according to claim 7, characterized in that: Two groups of mounting plate limit blocks (20) are symmetrically mounted at the front and rear ends of the mounting plate (5), and each group of mounting plate limit blocks (20) consists of two.

9. The transformer on-load tap changer hoisting device according to claim 8, characterized in that: The mounting plate limit block (20) is slidably connected to the first limit groove (14) and the second limit groove (15), respectively. A second support column groove (21) is provided on one side of the mounting plate limit block (20), and the second support column groove (21) is respectively matched with the transverse support column (3) and the longitudinal support column (4).

10. A method for using a transformer on-load tap changer hoisting device according to claim 9, characterized in that: The following steps are involved: Step 1: Splice the support column (2) and the transverse support column (3), place the support arch (6) above the support bucket (7) and fix them with bolts, slide the transverse support column (3) and the installation slide groove (12) of the connecting bucket (23) to connect them, let the two ends of the transverse support column (3) extend to the outside of the installation slide groove (12), install the limiting mechanism (11) above the two ends of the transverse support column (3), make the limiting block (16) of the limiting mechanism correspond to the first limiting groove (14), the first support column groove (17) correspond to the transverse support column (3), press the limiting mechanism (11) downward to make the limiting mechanism (11) and the transverse support column (3) clamped; Step 2: Pass the longitudinal support column (4) through the installation slide groove (12) with the connecting bucket (23) and the longitudinal support column groove (13) in sequence, so that the two ends of the longitudinal support column (4) extend to the outside of the installation slide groove (12), install the limiting mechanism (11) above the two ends of the longitudinal support column (4), make the limiting block (16) of the limiting mechanism correspond to the second limiting groove (15), and the first support column groove (17) correspond to the longitudinal support column (4), press the limiting mechanism (11) downward to make the limiting mechanism (11) and the longitudinal support column (4) engage with each other; Step 3: Align the mounting plate limit block (20) of the mounting plate (5) with the first limit groove (14) and fit them together, so that the mounting plate (5) is clamped on the top of the transverse support column (3), and the electric hoist (9) is installed on the top of the mounting plate (5); Step 4: During hoisting, the electric hoist (9) is connected to the hoisting connection mechanism (10) through a hook, and the electric hoist (9) is driven horizontally by a driving mechanism above the electric hoist (9) so that the hoisting connection mechanism (10) is located above the on-load tap changer (8) of the transformer (22). The hoisting connection mechanism (10) is lowered by the electric hoist (9), and connected to the on-load tap changer (8) through the hook. The on-load tap changer (8) is lifted by retracting the steel wire rope by the electric hoist (9), and then driven toward one side of the transformer (22) by the driving mechanism above the electric hoist (9). When the on-load tap changer (8) is misaligned with the transformer (22), the on-load tap changer (8) is lowered by the electric hoist (9), and the hook connection between the on-load tap changer (8) and the hoisting connection mechanism (10) is released.

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