Special hoisting tool for porcelain sleeve of large oil-immersed power transformer

Abstract

The utility model discloses a special hoisting tool for a porcelain sleeve of a large oil-immersed power transformer, which comprises a mounting base, a sleeve is fixedly arranged at the top of the mounting base, a sleeve base is fixedly arranged at the bottom of the sleeve, lifting lugs are fixedly arranged on two sides of the sleeve base respectively, lifting lug clamps are clamped on the outer sides of the lifting lugs, and the lifting lugs are clamped on the lifting lug clamps. The lifting lug clamp is fixedly connected with the lifting lug, a plurality of threaded rods are arranged at the top of the lifting lug clamp, the bottom ends of the threaded rods penetrate through the lifting lug clamp and extend downwards, a base is fixedly arranged at the bottoms of the threaded rods, the base is placed on the mounting base, a nut is arranged on each threaded rod in a sleeving mode, and the lifting lug clamp is fixedly connected with the lifting lug. According to the lifting mode of the sleeve lifting device, through the mode that the four nuts rotate at the same time, a sleeve can be stably lifted in a shaking-free mode, and the risk that the sleeve is collided when lifted in a narrow space is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed power transformer maintenance, in particular to a special lifting tool for porcelain bushings of large oil-immersed power transformers. Background Art

[0002] The main transformer of a power plant generally needs to be drained and inspected once every ten years, and the relevant gaskets need to be replaced. If the installation flange gasket of the bushing on the low-voltage side of the transformer is replaced, the bushing weighing several hundred kilograms needs to be hoisted and lifted about 20 cm. However, the low-voltage side of the main transformer of a power plant generally adopts a closed busbar structure, that is, the low-voltage bushing is blocked by the closed busbar directly above, and it is impossible to use a truck crane for lifting. For this type of lifting, the existing method is to set up a load-bearing scaffolding and use a hand winch for lifting. Use the two 180° distributed lifting ears on the top of the bushing, insert the lifting belt and the shackle into the lifting ears, hang the lifting belt on the load-bearing rod, and then use two sets of hand winches to connect to the external load-bearing scaffolding to form a set of lifting tools.

[0003] However, this type of lifting method is very unstable, with large shaking during lifting, and there is a risk of damaging the porcelain bottle of the bushing. In addition, there is only less than 40 cm of height space on the upper part of the bushing. After the load-bearing rod and the sling are installed, there is very little height space left for lifting, and the lifting height of 20 cm cannot be reached. The insufficient lifting height of the bushing makes it very difficult to replace the sealing gasket, and it is very likely that the sealing surface will not be cleaned, thereby causing oil leakage from the sealing gasket. Therefore, the utility model proposes a special lifting tool for the porcelain bushing of large oil-immersed power transformer to solve the above problems. Utility Model Content

[0004] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a special lifting tool for the porcelain bushing of a large oil-immersed power transformer, and to provide a special tool for lifting the bushing when replacing the sealing gasket of the low-voltage bushing of the main transformer. The special tool can steadily lift the bushing by 20 cm, providing sufficient space for replacing the bushing sealing gasket.

[0005] To achieve the above-mentioned purpose, the utility model provides a special lifting tool for a porcelain bushing of a large oil-immersed power transformer, including a mounting base, a bushing fixedly arranged on the top of the mounting base, a bushing base fixedly arranged on the bottom of the bushing, lifting ears fixedly arranged on both sides of the bushing base, a lifting ear clamp is clamped on the outer side of the lifting ear, the lifting ear clamp and the lifting ear are fixedly connected, a plurality of threaded rods are arranged on the top of the lifting ear clamp, the bottom end of the threaded rod passes through the lifting ear clamp and extends downward, a base is fixedly arranged at the bottom of the threaded rod, the base is placed on the mounting base, a nut is sleeved on each of the threaded rods, the nut is located below the lifting ear clamp, and the nut is threadably matched with the threaded rod.

[0006] Furthermore, threaded holes are respectively provided on the front and rear sides of the lifting ear clamp, and the lifting ear clamp is fixed to the lifting ear by bolts.

[0007] Furthermore, the threaded rod includes a threaded rod body, the bottom of the threaded rod body is fixedly connected to the base, a through hole is opened on one side of the top of the ear clamp, the top of the threaded rod body is inserted into the through hole and extends upward, and a nut is fixedly provided on the top of the threaded rod body.

[0008] Furthermore, at least two threaded rods are provided, and both the threaded rods and the bolts are made of stainless steel.

[0009] Furthermore, a plurality of screw holes are provided on the top of the base, and at least two of the screw holes are provided, and the bottom ends of the threaded rod bodies are threadedly fixed in the screw holes.

[0010] Furthermore, the lifting ear clamp is U-shaped, and the sleeve, sleeve base and lifting ear are integrally formed.

[0011] Furthermore, the two lifting ears are symmetrically fixedly arranged on both sides of the sleeve base.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides structures such as threaded rods, lifting lugs, and lifting lugs, and the lifting method is to simultaneously rotate four nuts to achieve stable and almost shake-free lifting of the casing, effectively avoiding the risk of collision of the casing during lifting in a narrow space;

[0014] The utility model can realize the working requirement of lifting the low-voltage bushing of the main transformer with a closed busbar structure on the top to a height of 20 cm, which is difficult to achieve with other lifting methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments of the utility model. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is the front view provided by the utility model;

[0017] Figure 2 It is a schematic diagram of the lifting lug structure provided by the utility model;

[0018] Figure 3 This is a diagram of the lifting lug fixture provided by the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the lifting lug clamp provided by the utility model;

[0020] Figure 5 It is a schematic diagram of the base structure provided by the utility model;

[0021] Description of reference numerals:

[0022] 1. Threaded hole; 2. Through hole; 3. Screw hole; 4. Threaded rod; 41. Nut; 42. Threaded rod body; 5. Lifting ear clamp; 6. Bolt; 7. Nut; 8. Sleeve base; 9. Base; 10. Lifting ear; 11. Mounting base; 12. Sleeve. Implementation

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0024] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order.

[0025] See also Figure 1-5, a special lifting tool for a porcelain bushing of a large oil-immersed power transformer, comprising a mounting base 11, a bushing 12 is fixedly arranged on the top of the mounting base 11, a bushing base 8 is fixedly arranged on the bottom of the bushing 12, lifting ears 10 are fixedly arranged on both sides of the bushing base 8, a lifting ear clamp 5 is clamped on the outer side of the lifting ear 10, the lifting ear clamp 5 is fixedly connected to the lifting ear 10, a plurality of threaded rods 4 are arranged on the top of the lifting ear clamp 5, the bottom end of the threaded rod 4 passes through the lifting ear clamp 5 and extends downward, a base 9 is fixedly arranged at the bottom of the threaded rod 4, and the base 9 is placed on the mounting base 11 Each threaded rod 4 is sleeved with a nut 7, which is located below the ear clamp 5. The nut 7 is threadedly matched with the threaded rod 4. A ear clamp 5 is installed on each of the two ears 10 of the casing base, and a bolt 6 with a diameter of 20 mm is passed through the threaded holes 1 of the two arms of the ear clamp 5 and the ear holes of the ear 10. By adjusting the matching size design (the matching size can be appropriately adjusted according to the different structures of the casing base 8), the ear clamp 5 and the ear 10 can be firmly fixed and clamped; the base of the lifting tool is placed on the installation base 11 9, a threaded rod 4 is fixed on the base 9, the threaded rod 4 passes through the through hole 2 of the ear clamp 5, the threaded rod 4 is sleeved with a nut 7 on the outer thread, the nut 7 is tightly attached to the lower surface of the ear clamp 5, and the nuts 7 on the four threaded rods 4 are rotated upward or downward at the same time, driving the ear clamp 5 to move upward or downward, thereby driving the sleeve 12 to rise and fall stably, and the front and rear sides of the ear clamp 5 are respectively provided with threaded holes 1, the ear clamp 5 and the ear 10 are fixed by bolts 6, the threaded rod 4 includes a threaded rod body 42, the bottom of the threaded rod body 42 is fixedly connected to the base 9, and the ear clamp A through hole 2 is provided on one side of the top of the base 9, the top of the threaded rod 42 is inserted into the through hole 2 and extends upward, a nut 41 is fixedly provided on the top of the threaded rod 42, at least two threaded rods 4 are provided, the threaded rod 4 and the bolt 6 are made of stainless steel, a plurality of screw holes 3 are provided on the top of the base 9, at least two screw holes 3 are provided, the bottom end of the threaded rod 42 is threadedly fixed in the screw holes 3, the ear clamp 5 is U-shaped, the sleeve 12, the sleeve base 8 and the ear 10 are integrally formed, and the two ears 10 are symmetrically fixed on both sides of the sleeve base 8.

[0026] Working principle and usage of the utility model:

[0027] When in use, a bolt 6 with a diameter of 20 mm is passed through the threaded holes 1 of the two arms of the lifting ear clamp 5 and the lifting ear hole of the lifting ear 10, and the purpose of secure fixation and clamping between the lifting ear clamp 5 and the lifting ear 10 is achieved by adjusting the matching size design (the matching size can be appropriately adjusted according to the different structures of the sleeve base 8); a base 9 of the lifting tool is placed on the mounting base 11, and a threaded rod 4 is fixed on the base 9. The threaded rod 4 passes through the through hole 2 of the lifting ear clamp 5, and a nut 7 is provided on the external thread sleeve of the threaded rod 4. The nut 7 is tightly attached to the lower surface of the lifting ear clamp 5, and the nuts 7 on the four threaded rods 4 are rotated upward or downward at the same time, driving the lifting ear clamp 5 to move upward or downward, thereby driving the sleeve 12 to rise and fall stably.

[0028] The above description is only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the utility model, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. Special lifting tool for porcelain bushing of large oil-immersed power transformer, characterized by: The invention comprises a mounting base (11), a sleeve (12) is fixedly provided on the top of the mounting base (11), a sleeve base (8) is fixedly provided on the bottom of the sleeve (12), lifting ears (10) are fixedly provided on both sides of the sleeve base (8), a lifting ear clamp (5) is clamped on the outer side of the lifting ear (10), the lifting ear clamp (5) and the lifting ear (10) are fixedly connected, a plurality of threaded rods (4) are provided on the top of the lifting ear clamp (5), the bottom ends of the threaded rods (4) pass through the lifting ear clamp (5) and extend downward, a base (9) is fixedly provided on the bottom of the threaded rod (4), the base (9) is placed on the mounting base (11), a nut (7) is sleeved on each of the threaded rods (4), the nut (7) is located below the lifting ear clamp (5), and the nut (7) is threadedly matched with the threaded rod (4).

2. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 1 is characterized by: The front and rear sides of the lifting ear clamp (5) are respectively provided with threaded holes (1), and the lifting ear clamp (5) and the lifting ear (10) are fixed by bolts (6).

3. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 2 is characterized by: The threaded rod (4) comprises a threaded rod body (42), the bottom of the threaded rod body (42) is fixedly connected to the base (9), a through hole (2) is opened on one side of the top of the hanging ear clamp (5), the top end of the threaded rod body (42) is inserted into the through hole (2) and extends upward, and a nut (41) is fixedly arranged on the top end of the threaded rod body (42).

4. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 3 is characterized by: At least two threaded rods (4) are provided, and both the threaded rods (4) and the bolts (6) are made of stainless steel.

5. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 4 is characterized by: The top of the base (9) is provided with a plurality of screw holes (3), at least two of the screw holes (3) are provided, and the bottom ends of the threaded rod bodies (42) are threadedly fixed in the screw holes (3).

6. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 5 is characterized by: The lifting ear clamp (5) is arranged in a U shape, and the sleeve (12), the sleeve base (8) and the lifting ear (10) are integrally formed.

7. The special lifting tool for porcelain bushing of large oil-immersed power transformer according to claim 6 is characterized by: The two lifting ears (10) are symmetrically fixedly arranged on both sides of the sleeve base (8).

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