Main transformer iron core transfer clamp

Abstract

The utility model discloses a main transformer iron core transfer clamp which comprises a transfer trolley plate used for loading a main transformer iron core, a first clamp assembly used for clamping and fixing the position of a lower iron core clamp on the transfer trolley plate is arranged on the plate face of the transfer trolley plate, and a second clamp assembly used for clamping an upper iron core clamp to prevent the main transformer iron core from toppling over is further arranged on the plate face of the transfer trolley plate. The first clamp assembly directly limits the horizontal displacement of the iron core on the transfer trolley plate by fixing a lower iron core clamp; the second clamp assembly fixes the upper iron core clamp to form constraint on the height of the iron core, and the toppling risk caused by the high gravity center is prevented. The main transformer iron core fixing device is suitable for most types of transfer trolley plates, solves the sliding problem during start-stop / turning on a non-flat road surface in the background technology, and further solves the problem that the main transformer iron core is prone to displacement and damage due to the fact that the main transformer iron core is not firmly fixed.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, specifically to a main transformer core transfer fixture. Background Technology

[0002] Large power transformers (main transformers) are core equipment in power systems. Their cores, serving as the main magnetic circuit and critical load-bearing structure, are typically constructed from stacked high-permeability silicon steel sheets. They are characterized by their large size, heavy weight, precise structure, easily damaged surface insulation coating, and relatively weak overall rigidity (relative to their size and weight). During transformer manufacturing, factory testing, on-site installation, and maintenance, the cores frequently need to be transported between workshops, testing stations, warehouses, or installation sites. Ensuring the stability, safety, and integrity of the cores during transport is crucial; any impact, deformation, or insulation damage can severely affect the transformer's performance and operational reliability.

[0003] Currently, common fixing methods when transferring main transformer cores include: direct binding with wire ropes or slings, simple brackets or wooden supports, and general lifting clamps.

[0004] The aforementioned existing technologies and methods have the problem that the iron core is very prone to displacement, sliding, and shaking relative to the clamps or supports during the transfer process (especially when moving on uneven roads, when starting or stopping the equipment, or when turning), which may even cause the entire iron core to tilt in severe cases.

[0005] Therefore, there is an urgent need in this field to develop a transfer clamp specifically designed for the structural characteristics of the main transformer core. This clamp should be able to firmly and reliably hold or constrain the core body, effectively preventing displacement, sliding, or tipping of the core in any direction during the entire transfer process, thus solving the aforementioned problems.

[0006] The main transformer core includes, but is not limited to, multiple core columns arranged vertically at intervals, an upper core clamp located above the core columns to connect the upper ends of the multiple core columns to each other, and a lower core clamp located below the core columns to connect the lower ends of the multiple core columns to each other.

[0007] The upper and lower iron core clamps have the same structure and are both strip structures, with the extended side being the side and the extended end being the end.

[0008] Transfer platforms include, but are not limited to, platforms for full trailers, semi-trailers, flatbed semi-trailers, low-bed semi-trailers, and flatbed transport vehicles. Utility Model Content

[0009] The main purpose of this utility model is to provide a main transformer core transfer fixture, which aims to solve the technical problem in the prior art that the main transformer core is not firmly fixed, resulting in easy displacement and damage of the main transformer core.

[0010] To achieve the above objectives, the present invention proposes a main transformer core transfer fixture, which includes a transfer vehicle plate for loading the main transformer core. The transfer vehicle plate is provided with a first clamping assembly for clamping and fixing the lower core clamp on the transfer vehicle plate, and a second clamping assembly for clamping the upper core clamp to prevent the main transformer core from tipping over.

[0011] Preferably, the first clamping assembly includes an end fixing assembly for fixing the end of the lower core clamp, and a side fixing assembly for fixing the side of the lower core clamp.

[0012] Preferably, the end fixing assembly includes first support plates symmetrically arranged on both sides above the transfer vehicle plate. First clamping plates are respectively distributed on the side of the symmetrically arranged first support plates that are close to each other. A first hydraulic cylinder is provided on the side of the first support plate away from the first clamping plate. The side of the first hydraulic cylinder that is close to the first support plate is connected to the first clamping plate through the output shaft of the first hydraulic cylinder. The first hydraulic cylinder is used to push the first clamping plate to move towards the side of the other first clamping plate.

[0013] Preferably, the side fixing assembly includes second support plates symmetrically arranged on both sides above the transfer vehicle plate. The distribution direction of the symmetrically arranged second support plates is perpendicular to the distribution direction of the symmetrically arranged first support plates. Second clamping plates are respectively distributed on the side of the symmetrically arranged second support plates that are close to each other. A second hydraulic cylinder is provided on the side of the second support plate that is away from the second clamping plate. The side of the second hydraulic cylinder that is close to the second support plate is connected to the second clamping plate through the output shaft of the second hydraulic cylinder. The second hydraulic cylinder is used to push the second clamping plate to move towards the other side of the second clamping plate.

[0014] Preferably, each of the first clamping plates is provided with a first pressure sensor on the side away from the first support plate, and each of the second clamping plates is provided with a second pressure sensor on the side away from the second support plate.

[0015] Preferably, a groove is recessed on the upper side of each second support plate, the second clamping assembly includes a plurality of sliders slidably disposed in the groove, and a third clamping plate disposed above each second support plate. A plurality of sliding sleeves are slidably disposed on each third clamping plate, and the outer wall of each sliding sleeve is rotatably connected to the sliders on the second support plate located below the third clamping plate through a rotatably connected telescopic support member.

[0016] Each of the sliding sleeves is provided with connecting blocks symmetrically distributed on its upper and lower sides. Each of the connecting blocks has a through hole for bolts to pass through. When the two third clamping plates are located on the sides of the upper iron core clamp, the connecting blocks of the sliding sleeves on one third clamping plate and the connecting blocks of the sliding sleeves on the other third clamping plate are connected one-to-one by screws passing through the through holes of the two connecting blocks, so that the two third clamping plates clamp and fix the upper iron core clamp.

[0017] Preferably, the telescopic support includes a first slide rod that is rotatably connected to the slider and has a hollow structure, a second slide rod that is slidably disposed inside the first slide rod, and the end of the second slide rod that is away from the first slide rod is rotatably connected to the outer wall of the slide sleeve;

[0018] The first slide rod has a first fixing hole that passes through both sides of the first slide rod, and the second slide rod has a plurality of second fixing holes that are distributed along the extension direction of the second slide rod. The extension direction of each second fixing hole is the same as the extension direction of the first fixing hole. The telescopic support also includes a plug that can be detachably inserted into the first fixing hole and the second fixing hole.

[0019] Preferably, the diameter of the second fixing hole is larger than the diameter of the first fixing hole.

[0020] Preferably, each of the sliding sleeves has an anti-slip layer on its inner wall near the third clamping plate.

[0021] Preferably, protective layers are provided on the side of each first clamping plate that contacts the lower iron core clamping fixture, the side of each second clamping plate that contacts the lower iron core clamping fixture, and the side of each third clamping plate that contacts the upper iron core clamping fixture.

[0022] In the technical solution of this utility model, the first clamping assembly directly restricts the horizontal displacement of the iron core on the transfer vehicle by fixing the lower iron core clamp (the bottom foundation of the iron core);

[0023] The second clamping assembly secures the upper iron core clamp (top iron core connector), constraining the height of the iron core and preventing the risk of tipping over due to its high center of gravity.

[0024] It is compatible with most types of transfer vehicles (full trailers, flatbed semi-trailers, etc.), solving the slippage problem when starting, stopping / turning on uneven roads in the background technology, and further solving the problem that the main transformer core is easily displaced and damaged due to insecure fixing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the telescopic support structure of this utility model;

[0028] Figure 3 This is a partial structural diagram of the telescopic support component of this utility model;

[0029] Figure 4 For the present utility model Figure 1 A magnified schematic diagram of the local structure of area A in the diagram.

[0030] Explanation of icon numbers:

[0031] 1. Transfer platform; 2. First clamping assembly; 21. End fixing assembly; 211. First support plate; 212. First hydraulic cylinder; 213. First clamping plate; 22. Side fixing assembly; 221. Second support plate; 221a. Slide groove; 222. Second hydraulic cylinder; 223. Second clamping plate; 3. Second clamping assembly; 31. Third clamping plate; 32. Sliding sleeve; 33. Connecting block; 34. Slider; 35. Telescopic support; 351. First sliding rod; 351a. First fixing hole; 352. Second sliding rod; 352a. Second fixing hole; 353. Bolt.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] This utility model proposes a main transformer core transfer fixture.

[0039] Please refer to Figures 1 to 4 The main transformer core transfer fixture includes a transfer platform 1 for loading the main transformer core. The transfer platform 1 is provided with a first clamping assembly 2 for clamping and fixing the lower core clamp on the transfer platform 1, and a second clamping assembly 3 for clamping the upper core clamp to prevent the main transformer core from tipping over.

[0040] In the technical solution of this utility model, the first clamping assembly 2 directly restricts the horizontal displacement of the iron core on the transfer vehicle plate 1 by fixing the lower iron core clamp (the bottom foundation of the iron core);

[0041] The second clamping assembly 3 secures the upper iron core clamp (iron core top connector) to constrain the height of the iron core and prevent the risk of tipping over due to the high center of gravity.

[0042] It is compatible with most types of transfer vehicles (full trailers, flatbed semi-trailers, etc.), solving the slippage problem when starting, stopping / turning on uneven roads in the background technology, and further solving the problem that the main transformer core is easily displaced and damaged due to insecure fixing.

[0043] Please refer to the appendix. Figure 1 The first clamping assembly 2 includes an end fixing assembly 21 for fixing the end of the lower core clamp, and a side fixing assembly 22 for fixing the side of the lower core clamp. The end fixing assembly 21 restricts the forward and backward displacement of the lower core clamp (along the direction of the extended end of the strip structure);

[0044] The side fixing component 22 restricts its left and right displacement (along the extended side of the strip structure), and the two work together to achieve omnidirectional locking in a two-dimensional plane, preventing slippage.

[0045] Please refer to the appendix. Figure 1 The end fixing assembly 21 includes first support plates 211 symmetrically arranged on both sides above the transfer vehicle plate 1. First clamping plates 213 are respectively distributed on the side of the symmetrically arranged first support plates 211 that are close to each other. A first hydraulic cylinder 212 is provided on the side of the first support plate 211 away from the first clamping plate 213. The side of the first hydraulic cylinder 212 closest to the first support plate 211 is connected to the first clamping plate 213 through the output shaft of the first hydraulic cylinder 212. The first hydraulic cylinder 212 is used to push the first clamping plate 213 to move towards the other side of the first clamping plate 213. The first hydraulic cylinder 212 drives the first clamping plate 213 closer to the end of the lower iron core clamp, thereby fixing the end of the lower iron core clamp. The first support plates 211 provide a stable base, and combined with the high output force of the first hydraulic cylinder 212, ensures that the clamping force is sufficient to resist inertial impacts during transfer (such as sudden braking and bumps), while also being able to quickly adapt to lower iron core clamps of different sizes, avoiding the problem of inconsistent tightness due to manual binding.

[0046] Please refer to the appendix. Figure 1 The side fixing assembly 22 includes second support plates 221 symmetrically arranged on both sides above the transfer vehicle plate 1. The distribution direction of the symmetrically arranged second support plates 221 is perpendicular to the distribution direction of the symmetrically arranged first support plates 211. Second clamping plates 223 are respectively distributed on the side of the symmetrically arranged second support plates 221 that are close to each other. A second hydraulic cylinder 222 is provided on the side of the second support plate 221 that is away from the second clamping plate 223. The side of the second hydraulic cylinder 222 that is close to the second support plate 221 is connected to the second clamping plate 223 through the output shaft of the second hydraulic cylinder 222. The second hydraulic cylinder 222 is used to push the second clamping plate 223 to move towards the other side of the second clamping plate 223. The second hydraulic cylinder 222 drives the second clamping plate 223 to approach the side of the lower iron core clamp, thereby fixing the side of the lower iron core clamp. The second support plate 221 provides a stable base. Combined with the high output force of the second hydraulic cylinder 222, it ensures that the clamping force is sufficient to resist the inertial impact during transportation (such as sudden braking and bumps). At the same time, it can quickly adapt to lower iron core clamps of different sizes, avoiding the problem of inconsistent tightness due to manual binding.

[0047] Please refer to the appendix. Figure 1Each of the first clamping plates 213 has a first pressure sensor on the side opposite to the first support plate 211, and each of the second clamping plates 223 has a second pressure sensor on the side opposite to the second support plate 221. The first pressure sensor is connected to the first hydraulic cylinder 212 via a PLC controller, and the second pressure sensor is connected to the second hydraulic cylinder 222 via a PLC controller, so as to realize real-time monitoring of clamping force, control the output of the hydraulic cylinder via PLC to prevent overpressure damage to the iron core insulation coating, automatically compensate for clamping force in vibration scenarios, and solve the problem of "relative clamp displacement" in the background technology.

[0048] Please refer to the appendix. Figure 1 and 4 Each of the second support plates 221 has a groove 221a recessed on its upper side. The second clamping assembly 3 includes a plurality of sliders 34 slidably disposed in the groove 221a, and also includes a third clamping plate 31 disposed above each of the second support plates 221. A plurality of sliding sleeves 32 are slidably disposed on each of the third clamping plates 31. The outer wall of each sliding sleeve 32 is rotatably connected to the sliders 34 on the second support plate 221 located below the third clamping plate 31 through a telescopic support member 35 rotatably connected to each other.

[0049] Each of the sliding sleeves 32 is provided with connecting blocks 33 symmetrically distributed on its upper and lower sides. Each of the connecting blocks 33 has a through hole for bolts to pass through. When the two third clamping plates 31 are located on the sides of the upper iron core clamp, the connecting blocks 33 of the sliding sleeves 32 on one third clamping plate 31 and the connecting blocks 33 of the sliding sleeves 32 on the other third clamping plate 31 are connected one-to-one by screws passing through the through holes of the two connecting blocks 33, so that the two third clamping plates 31 clamp and fix the upper iron core clamp. The telescopic support 35 can extend and retract to adjust the distance between the third clamping plate 31 and the second support plate 221, thereby allowing the third clamping plate 31 to be positioned on the side of the main core clamp of the main transformer core at different heights. When clamping the upper core clamp, the sliding sleeves 32 on the third clamping plate 31 are moved respectively, so that the sliding sleeves 32 on the two clamping plates correspond to each other. The screws pass through the connecting blocks 33 on the corresponding sliding sleeves 32 respectively, so that the two connecting blocks 33 on the sliding sleeves 32 are connected, so that the connecting blocks 33 on one sliding sleeve 32 and the connecting blocks 33 on the other sliding sleeve 32 are brought closer to each other, further clamping the upper core clamp between the two third clamping plates 31, and connecting the upper and lower connecting blocks 33 of the sliding sleeves 32 are connected one by one.

[0050] The sliding sleeves 32 on the two third clamping plates 31 are connected in a conventional way. The connecting block 33 above the sliding sleeve 32 is connected to the connecting block 33 above the other sliding sleeve 32, and the connecting block 33 below is connected to the connecting block 33 below the other sliding sleeve 32.

[0051] The sliding sleeve 32 slides on the third clamping plate 31. When the screw connects the two connecting blocks 33, the sliding sleeve 32 is moved between the two iron core columns, so that the screw can pass between the two iron core columns to connect the two connecting blocks 33, thereby avoiding structural interference; further, it can fix the main transformer iron cores of different sizes.

[0052] The slider 34 has an inverted "T" shape, and the groove 221a has an inverted "T" shape that cooperates with the slider 34 to prevent the slider 34 from disengaging from the groove 221a.

[0053] Please refer to the appendix. Figure 1-3 The telescopic support 35 includes a first slide rod 351 that is rotatably connected to the slider 34 and has a hollow structure. A second slide rod 352 is slidably disposed inside the first slide rod 351. The end of the second slide rod 352 that is away from the first slide rod 351 is rotatably connected to the outer wall of the sliding sleeve 32.

[0054] The first slide rod 351 has a first fixing hole 351a extending through both sides of it. The second slide rod 352 has multiple second fixing holes 352a extending along its extension direction. The extension direction of each second fixing hole 352a is the same as that of the first fixing hole 351a. The telescopic support 35 also includes a plug 353 detachably inserted into the first fixing hole 351a and the second fixing hole 352a. The plug 353 is inserted into the first / second fixing hole to achieve length locking, which is more efficient than threaded adjustment and suitable for transportation scenarios involving frequent disassembly and assembly.

[0055] Please refer to the appendix. Figure 3 The diameter of the second fixing hole 352a is larger than the diameter of the first fixing hole 351a. The structure that the first fixing hole 351a is larger than the second fixing hole 352a facilitates the insertion of the plug 353, improves insertion and removal efficiency, and reduces operation time.

[0056] Please refer to the appendix. Figure 1 Each of the sliding sleeves 32 has an anti-slip layer on its inner wall near the third clamping plate 31. This increases the friction between the sliding sleeve 32 and the third clamping plate 31, preventing the sliding sleeve 32 from accidentally shifting during clamping and ensuring clamping stability.

[0057] Please refer to the appendix. Figure 1 Each of the first clamping plates 213, the side of each second clamping plate 223 in contact with the lower iron core clamping fixture, and the side of each third clamping plate 31 in contact with the upper iron core clamping fixture are respectively provided with protective layers. This prevents the metal clamping plates from directly contacting the iron core surface and prevents scratches on the insulating coating of the silicon steel sheet during transportation, addressing the pain point of "easily damaged surface insulating coating" mentioned in the background.

[0058] The specific operation of this utility model is as follows: The core clamp below the main transformer core is hoisted onto the transfer vehicle plate 1 with the first clamping plate 213 facing the side. The two first hydraulic cylinders 212 drive the first clamping plate 213 to move away from the first support plate 211, so that the two first clamping plates 213 clamp the end of the lower core clamp. The two second hydraulic cylinders 222 drive the second clamping plate 223 to move away from the second support plate 221, so that the two second clamping plates 223 clamp the side of the lower core clamp. The sliding sleeve 32 is moved so that the sliding sleeve 32 is located between the two core columns (so that the screw can pass between the two core columns, thereby connecting the two opposing connecting blocks 33). The second slide bar 352 is pulled out from the first slide bar 351 until the third clamping plate 31 is located on the side of the upper iron core clamp, so that the two third clamping plates 31 are located on both sides of the upper iron core clamp. The plug 353 is inserted into the first fixing hole 351a and the second fixing hole 352a to fix the position of the second slide bar 352. At this time, the screw is passed through the two connecting blocks 33 on each of the two opposite sliding sleeves 32 and tightened by the nut screw, so that the two third clamping plates 31 clamp the side of the upper iron core clamp. When the two third clamping plates 31 clamp and fix the upper iron core clamp, the telescopic fixing members on both sides cooperate with the third clamping plate 31 to form a triangle to prevent the main transformer iron core from tilting.

[0059] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A main transformer core transfer fixture, characterized in that, The system includes a transfer vehicle for loading the main transformer core, wherein the transfer vehicle surface is provided with a first clamping assembly for clamping and fixing the lower core clamp on the transfer vehicle surface, and a second clamping assembly for clamping the upper core clamp to prevent the main transformer core from tipping over; The first clamp assembly includes an end fixing assembly for fixing the end of the lower core clamp, and a side fixing assembly for fixing the side of the lower core clamp; The end fixing assembly includes first support plates symmetrically arranged on both sides above the transfer vehicle plate. First clamping plates are respectively distributed on the side of the symmetrically arranged first support plates that are close to each other. A first hydraulic cylinder is provided on the side of the first support plate that is away from the first clamping plate. The side of the first hydraulic cylinder that is close to the first support plate is connected to the first clamping plate through the output shaft of the first hydraulic cylinder. The first hydraulic cylinder is used to push the first clamping plate to move towards the other side of the first clamping plate. The side fixing assembly includes second support plates symmetrically arranged on both sides above the transfer vehicle plate. The distribution direction of the symmetrically arranged second support plates is perpendicular to the distribution direction of the symmetrically arranged first support plates. Second clamping plates are respectively distributed on the side of the symmetrically arranged second support plates that are close to each other. A second hydraulic cylinder is provided on the side of the second support plate that is away from the second clamping plate. The side of the second hydraulic cylinder that is close to the second support plate is connected to the second clamping plate through the output shaft of the second hydraulic cylinder. The second hydraulic cylinder is used to push the second clamping plate to move towards the other side of the second clamping plate. Each of the first clamping plates is provided with a first pressure sensor on the side opposite to the first support plate, and each of the second clamping plates is provided with a second pressure sensor on the side opposite to the second support plate; Each of the second support plates has a groove recessed on its upper side. The second clamping assembly includes a plurality of sliders slidably disposed in the groove and a third clamping plate disposed above each of the second support plates. A plurality of sliding sleeves are slidably disposed on each of the third clamping plates. The outer wall of each sliding sleeve is rotatably connected to the sliders on the second support plate located below the third clamping plate through a telescopic support member that is rotatably connected to each other. Each of the sliding sleeves is provided with connecting blocks symmetrically distributed on its upper and lower sides. Each of the connecting blocks has a through hole for bolts to pass through. When the two third clamping plates are located on the sides of the upper iron core clamp, the connecting blocks of the sliding sleeves on one third clamping plate and the connecting blocks of the sliding sleeves on the other third clamping plate are connected one-to-one by screws passing through the through holes of the two connecting blocks, so that the two third clamping plates clamp and fix the upper iron core clamp.

2. The main transformer core transfer fixture according to claim 1, characterized in that, The telescopic support includes a first slide rod that is rotatably connected to the slider and has a hollow structure. A second slide rod is slidably disposed inside the first slide rod. The end of the second slide rod that is away from the first slide rod is rotatably connected to the outer wall of the slide sleeve. The first slide rod has a first fixing hole that passes through both sides of the first slide rod, and the second slide rod has a plurality of second fixing holes that are distributed along the extension direction of the second slide rod. The extension direction of each second fixing hole is the same as the extension direction of the first fixing hole. The telescopic support also includes a plug that can be detachably inserted into the first fixing hole and the second fixing hole.

3. The main transformer core transfer fixture according to claim 2, characterized in that, The diameter of the second fixing hole is larger than the diameter of the first fixing hole.

4. The main transformer core transfer fixture according to claim 1, characterized in that, Each of the aforementioned sliding sleeves has an anti-slip layer on its inner wall near the third clamping plate.

5. The main transformer core transfer fixture according to claim 1, characterized in that, A protective layer is provided on the side of each of the first clamping plates that contacts the lower iron core clamp, the side of each of the second clamping plates that contacts the lower iron core clamp, and the side of each of the third clamping plates that contacts the upper iron core clamp.

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