Transformer body twelve-point pressing tool and using method

Abstract

The invention belongs to the technical field of transformers, and discloses a transformer body twelve-point pressing tool and a using method.The tool is characterized in that a second reinforcing plate and a first reinforcing plate are arranged on the left side and the right side of the center of the top of a coil pressing plate of a transformer; the second reinforcing plate is arranged on the outer side of the first reinforcing plate; a low-voltage side clamping piece is arranged on one of the front side and the rear side of the center of the top of the coil pressing plate, and a high-voltage side clamping piece is arranged on the other side of the center of the top of the coil pressing plate; the two first reinforcing plates are arranged on the left side and the right side of the coil pressing plate of the transformer, the two ends, located on the front side and the rear side of the coil pressing plate of the transformer, of the coil pressing plate of the transformer are connected through pressing modules, and the two second reinforcing plates are arranged on the left side and the right side of the coil pressing plate of the transformer. The problems that traditional four-point and six-point pressing structures are uneven in pressure distribution and poor in adaptability can be solved, the number of pressing points is expanded, pressure uniformity is optimized, and the body size adaptability is improved.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, specifically relating to a twelve-point clamping fixture for transformer body and its usage method. Background Technology

[0002] The short-circuit withstand capability of large power transformers is a core indicator for measuring their reliability, and optimizing the transformer body clamping process is a key step in improving this performance. In traditional processes, transformer body clamping mainly relies on a four-point clamping structure, where four clamping points are symmetrically arranged between the clamp web and the transformer body clamping plate. However, this clamping process requires the coil clamping plate to withstand high local stress, and uneven pressure on the coil clamping plate leads to uneven stress on the coil, easily causing coil warping and deformation, as well as cracking of the insulation layer clamping plate, resulting in ineffective clamping. Furthermore, it often requires welding special corner plates to the clamp web for body clamping, which not only occupies unnecessary clamp web space but also severely tests the strength of the corner plates and their welds. With the increase in transformer capacity and size, the limitations of this structure have become increasingly apparent.

[0003] Chinese Patent Publication No. CN115497734A, entitled "A Transformer Body Clamping Fixture Structure and Method," discloses a transformer body clamping fixture structure and method. This patent application overcomes the problem of limited axial clamping height and avoids excessive concentration of force in the radial area of ​​the transformer body. However, this patent application only optimizes the force transmission path of the edge clamping points and cannot effectively solve the problem of uneven force distribution during transformer coil clamping. Chinese Patent Publication No. CN116741517A, entitled "A Transformer Body Clamping Fixture and its Usage Method," proposes a six-point clamping system that optimizes pressure distribution through a sliding groove adjustment fixture. However, the upper clamping member bears excessive stress, and the number and distribution of clamping points are still insufficient to adapt to ultra-large diameter transformer bodies. The clamping force attenuates significantly in the edge area, and it relies on the middle long rod to transmit pressure, requiring high strength from the middle long rod. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the present invention aims to provide a 12-point clamping fixture for transformer body and its usage method. Through modular structural design, it solves the problems of uneven pressure distribution and poor adaptability of traditional four-point and six-point clamping structures, and realizes the expansion of the number of clamping points, optimization of pressure uniformity and improvement of the adaptability of transformer body size.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a twelve-point clamping fixture for a transformer body, comprising: a first reinforcing plate and a second reinforcing plate, wherein the second reinforcing plate and the first reinforcing plate are respectively disposed on the left and right sides of the top center of the transformer coil pressure plate; the second reinforcing plate is disposed outside the first reinforcing plate; a low-voltage side clamp is disposed on one side of the front and rear sides of the top center of the coil pressure plate, and a high-voltage side clamp is disposed on the other side; the first reinforcing plate includes a horizontal plate with two opposing vertical plates vertically connected at both ends, and the second reinforcing plate includes a vertical plate and a horizontal plate vertically connected to each other; respectively located on the left and right sides of the transformer coil pressure plate. The two first reinforcing plates on the sides are connected at both ends of the front and rear sides of the transformer coil pressure plate by clamping modules, and the bottom of the clamping modules can accommodate at least two jacks; the two second reinforcing plates on the left and right sides of the transformer coil pressure plate are connected to the first reinforcing plates at both ends of the front and rear sides of the transformer coil pressure plate by clamping modules, and the bottom of the clamping modules can accommodate at least one jack; the low-voltage side clamp can be equipped with at least one jack at both ends of the left and right sides of the top center of the coil pressure plate; the high-voltage side clamp can be equipped with at least one jack at both ends of the left and right sides of the top center of the coil pressure plate.

[0006] Optionally, the coil pressure plate has a through hole in its center, and the core column end of the transformer core passes through the through hole of the coil pressure plate.

[0007] Optionally, the two first reinforcing plates are parallel to each other; the two second reinforcing plates are parallel to each other; and the first reinforcing plates and the second reinforcing plates are parallel to each other.

[0008] Optionally, the bottom of the clamping module, the bottom of the low-pressure side clamp, and the bottom of the high-pressure side clamp are all at the same height.

[0009] Optionally, the top of the clamping module is provided with a lifting ring or lifting hole for hoisting.

[0010] Optionally, the clamping module has fixing holes, and both sides of the clamping module are fixedly connected to the first reinforcing plate or the second reinforcing plate through threaded mechanisms installed in the fixing holes.

[0011] Optionally, a steel plate is provided below the left and right ends of the top center of the high-voltage side clamping member and the coil pressure plate; a steel plate is provided below the left and right ends of the top center of the coil pressure plate; the top of the steel plate is used to place jacks that support the high-voltage side clamping member and the low-voltage side clamping member.

[0012] Optionally, the steel plate and the second reinforcing plate are parallel to each other, and the two second reinforcing plates are parallel to each other.

[0013] Optionally, the low-pressure side clamp and the high-pressure side clamp are parallel to each other.

[0014] Secondly, the present invention provides a method for using the aforementioned twelve-point clamping fixture for transformer body, comprising the following steps: Place the jacks in the predetermined clamping positions so that the jacks are in contact with each tooling but without applying pressure; wherein, at least two jacks are provided at the bottom of each of the two clamping modules between the two first reinforcing plates; at least one jack is provided at the bottom of each of the four clamping modules between the first and second reinforcing plates; at least one jack is provided at each of the left and right ends of the low-pressure side clamp located at the top center of the coil pressure plate; at least one jack is provided at each of the left and right ends of the high-pressure side clamp located at the top center of the coil pressure plate. Simultaneously, pressure is applied to at least twelve jacks, with slow and repeated pressure application, and the coil is pressed to a preset height by the coil pressure plate. After completion, tighten the clamps and remove the jacks and the twelve-point clamping fixtures on the transformer body.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Traditional four-point clamping is roughly symmetrically distributed at 90°. Excessive local peak pressure on the coil clamping plate can easily lead to cracking, and uneven stress on the plate can affect the clamping effect. This invention solves the problems of stress concentration and crushing risk through a twelve-point clamping point topology and optimized layout. Existing clamping methods often require dedicated clamping angle plates welded to the web of the clamping member, which not only occupies web space but also severely tests the strength of the angle plates and welds, making it unsuitable for scenarios where the clamping support point is far from the center of the transformer body. The commonly used four-point clamping method has a large distance between clamping points. While expanding the clamping points evenly to eight points around the circumference can effectively improve the clamping effect, in ideal eight-point clamping, the clamping points inside the clamping member cannot find effective jacking points due to the influence of the upper yoke, and the influence of the lead wire exiting from the top must also be considered. Therefore, this invention improves the transformer body clamping fixture and method.

[0016] This invention allows the first and second reinforcing plates to be retained for use as clamping angle plates, saving clamping space and making it suitable for clamping scenarios where the pressing fulcrum is off-center from the transformer body. The transformer body twelve-point clamping fixture disclosed in this invention features a multi-module design, simple installation and disassembly, good stability, a more rational clamping force layout for the coil clamping plates, and low cost. Through its twelve-point clamping topology, this invention achieves simultaneous operation of twelve clamping points during pressing, forming a stable triangular pressurization structure, significantly improving the uniformity of pressure distribution on the transformer body. The modular structural design solves the problems of uneven pressure distribution and poor adaptability in traditional four-point and six-point clamping structures, achieving an expansion of the number of clamping points, optimized pressure uniformity, and improved adaptability to transformer body dimensions.

[0017] Furthermore, due to the influence of the yoke on the iron core, existing clamping methods often lack clamping points on the inner side of the clamping members, resulting in significant attenuation of the clamping force on the inner side of the clamping members, which poses a challenge to the strength of the coil clamping plate. This invention, by placing a thick steel plate between the jack and the coil clamping plate, effectively transmits the clamping force from both ends of the thick steel plate to the middle of the steel plate, evenly distributing the force on the coil clamping plate. Existing force transmission structures that add an external support can effectively expand the clamping points, but they place high demands on the strength and stability of the external support. Additionally, the installation of the external support requires multiple people, making installation difficult and time-consuming. This invention, through multi-modal tooling, facilitates easy installation and disassembly, simplifies installation, eliminates the need for a long rod force transmission structure, and improves stability. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a top view of the clamping fixture according to an embodiment of the present invention; Figure 2 This is a side view of an embodiment of the present invention; Figure 3 This is a front view of an embodiment of the present invention; Figure 4 Top view of the ideal eight-point compaction layout; Figure 5 This is an installation diagram of the clamping fixture between the first reinforcing plate and the second reinforcing plate according to an embodiment of the present invention; Figure 6 This is an installation diagram of the first reinforcing plate and the clamping fixture between the first reinforcing plates according to an embodiment of the present invention; Among them, 1. Jack; 2. Iron core; 3. Coil pressure plate; 4. Low-voltage side clamp; 5. High-voltage side clamp; 6. Clamping module; 7. Auxiliary pressure plate; 8. Steel plate; 9. Threading mechanism; 10. Nut; 11. First reinforcing plate; 12. Second reinforcing plate. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0020] Therefore, the following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] When an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. The use of the term "horizontal" does not imply that the component is required to be absolutely horizontal, but rather that it may be slightly tilted. "Horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0023] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] A transformer body twelve-point clamping fixture of the present invention includes: a first reinforcing plate 11 and a second reinforcing plate 12. The second reinforcing plate 12 and the first reinforcing plate 11 are respectively arranged on the left and right sides of the top center of the transformer coil pressure plate 3; the second reinforcing plate 12 is arranged outside the first reinforcing plate 11; a low-voltage side clamp 4 is arranged on one side of the front and rear sides of the top center of the coil pressure plate 3, and a high-voltage side clamp 5 is arranged on the other side; the first reinforcing plate 11 includes a horizontal plate with two opposing vertical plates vertically connected at both ends; the second reinforcing plate 12 includes a vertical plate and a horizontal plate vertically connected to each other; and two clamping plates are respectively located on the left and right sides of the transformer coil pressure plate 3. A first reinforcing plate 11 is connected to the coil pressure plate 3 at both ends via a clamping module 6, and the bottom of the clamping module 6 can accommodate at least two jacks 1. Two second reinforcing plates 12 are located on the left and right sides of the coil pressure plate 3, respectively. They are connected to the first reinforcing plate 11 at both ends via the clamping module 6, and the bottom of the clamping module 6 can accommodate at least one jack 1. At least one jack 1 can be installed at both ends of the low-voltage side clamp 4 located at the top center of the coil pressure plate 3 on the left and right sides. At least one jack 1 can be installed at both ends of the high-voltage side clamp 5 located at the top center of the coil pressure plate 3 on the left and right sides.

[0027] The terms "front side," "rear side," "left side," and "right side" mentioned above refer only to the present invention. Figure 1 The front, rear, left, and right sides of the embodiment are not limited to the case of this embodiment.

[0028] The method of using the twelve-point clamping fixture for the transformer body includes the following steps: The jack 1 is placed in the predetermined clamping position, so that the jack 1 is in contact with each tooling but without applying pressure; wherein, at least two jacks 1 are provided at the bottom of each of the two clamping modules 6 between the two first reinforcing plates 11; at least one jack 1 is provided at the bottom of each of the four clamping modules 6 between the first reinforcing plate 11 and the second reinforcing plate 12; at least one jack 1 is provided at each of the left and right ends of the low-pressure side clamp 4 located at the top center of the coil pressure plate 3; at least one jack 1 is provided at each of the left and right ends of the high-pressure side clamp 5 located at the top center of the coil pressure plate 3. Simultaneously, pressure is applied to at least twelve jacks 1, with slow and repeated pressure application, and the coil is pressed to a preset height by the coil pressure plate 3. After completion, tighten the clamps and remove the jack 1 and the 12-point clamping fixtures on the transformer body.

[0029] This invention allows the first reinforcing plate 11 and the second reinforcing plate 12 to be retained for use as clamping angle plates, saving clamping space and making it suitable for clamping scenarios where the clamping fulcrum is off-center from the transformer body. The transformer body twelve-point clamping fixture disclosed in this invention, through its multi-module design, is easy to install and disassemble, has good stability, and provides a more reasonable clamping force layout for the coil clamping plate 3, while also being cost-effective. Through its twelve-point clamping topology, this invention achieves simultaneous operation of twelve clamping points during clamping, forming a stable triangular pressurization structure, significantly improving the uniformity of pressure distribution on the transformer body. The modular structural design solves the problems of uneven pressure distribution and poor adaptability in traditional four-point and six-point clamping structures, achieving an expansion of the number of clamping points, optimized pressure uniformity, and improved adaptability to transformer body dimensions.

[0030] Example 1 A transformer body clamping fixture structure includes a coil clamping plate 3, a low-voltage side clamping piece 4, a high-voltage side clamping piece 5, an auxiliary clamping plate 7, and multiple clamping modules 6.

[0031] The coil pressure plate 3 is set on the top of the transformer. A through hole is opened in the center of the coil pressure plate 3, and the core column end of the transformer core 2 passes through the through hole of the coil pressure plate 3.

[0032] The top of the coil pressure plate 3 is provided with a tooling fixing reinforcement plate 100.

[0033] The tooling fixing reinforcement plate 100 includes a first reinforcement plate 11 and a second reinforcement plate 12.

[0034] The first reinforcing plate 11 and the second reinforcing plate 12 are both located on the top of the coil pressure plate 3.

[0035] Specifically, the first reinforcing plate 11 includes a horizontal plate with two opposing vertical plates vertically connected to its two ends.

[0036] Specifically, the second reinforcing plate 12 includes a vertical plate and a horizontal plate, with the end of the horizontal plate perpendicularly connected to the end of the vertical plate. The second reinforcing plate 12 is L-shaped.

[0037] like Figure 1 and Figure 2 As shown, the top of the coil pressure plate 3 is provided with two first reinforcing plates 11 and two second reinforcing plates 12. The two first reinforcing plates 11 are respectively located on both sides of the iron core 2 and close to the iron core 2. The two second reinforcing plates 12 are respectively located on both sides of the iron core 2 and away from the iron core 2. The two first reinforcing plates 11 and the two second reinforcing plates 12 are parallel to each other. The two first reinforcing plates 11 are positioned between the two second reinforcing plates 12.

[0038] The first reinforcing plates 11 on both sides of the core 2 are mirror-symmetrical about the core 2, and the second reinforcing plates 12 on both sides of the core 2 are mirror-symmetrical about the core 2.

[0039] like Figure 4 As shown, the low-voltage side clamp 4 and the high-voltage side clamp 5 are respectively disposed on the top of the coil pressure plate 3, and the low-voltage side clamp 4 and the high-voltage side clamp 5 are respectively disposed on both sides near the iron core 2. The first reinforcing plate 11 and the second reinforcing plate 12 are both perpendicular to the low-voltage side clamp 4.

[0040] The clamping module 6 is installed between the two tooling fixing reinforcing plates 100.

[0041] Both the low-pressure side clamp 4 located on the side away from the high-pressure side clamp 5 and the low-pressure side clamp 4 located on the side away from the high-pressure side clamp 5 are equipped with clamping modules 6. The number of clamping modules 6 on both sides is the same and they are mirror-symmetrical about the low-pressure side clamp 4 and the high-pressure side clamp 5.

[0042] The two first reinforcing plates 11 are connected by a clamping module 6; and the first reinforcing plate 11 and the second reinforcing plate 12 are both connected by a clamping module 6.

[0043] Among them, such as Figure 3 As shown, two jacks 1 are placed at the bottom of the clamping module 6 between the two first reinforcing plates 11; and one jack 1 is placed at the bottom of the clamping module 6 between the first reinforcing plate 11 and the second reinforcing plate 12.

[0044] The width of the clamping module 6 installed between the two first reinforcing plates 11 is greater than the width of the clamping module 6 between the first reinforcing plate 11 and the second reinforcing plate 12.

[0045] The jack 1 placed between the two first reinforcing plates 11 is further away from the iron core 2 than the jack 1 between the first reinforcing plate 11 and the second reinforcing plate 12.

[0046] like Figure 5 and Figure 6 As shown, the clamping module 6 has fixing holes, and both sides of the clamping module 6 are fixedly connected to the tooling fixing reinforcement plate 100 through threaded mechanisms 9 installed in the fixing holes. Nuts 10 are installed at the ends of the threaded mechanisms 9 as a loosening structure.

[0047] The tooling fixing reinforcement plate 100 has mounting holes corresponding to the fixing holes of the clamping module 6.

[0048] Specifically, the two vertical plates of the first reinforcing plate 11 have mounting holes that are the same number and position as the fixing holes of the clamping module 6.

[0049] After pressing, the first reinforcing plate 11 and the second reinforcing plate 12 can be directly used as clamping parts to press the corner plate without removal.

[0050] like Figure 1 As shown, four jacks 1 are symmetrically placed at the bottom of the low-voltage side clamp 4 and the high-voltage side clamp 5, and a steel plate 8 is placed between the four jacks 1 and the coil pressure plate 3, which can transmit pressure to the middle of the steel plate 8. There are two steel plates 8.

[0051] A jack 1 is placed at the bottom of the clamping module 6. After the jack 1 is tightened, the position of the jack 1 is the clamping fulcrum position.

[0052] Furthermore, an auxiliary pressure plate 7 is provided at the bottom of the jack 1.

[0053] All six clamping modules 6 are placed between the bottom jacks 1 of the low-pressure side clamp 4 and the high-pressure side clamp 5.

[0054] The six clamping modules 6 are positioned away from the outer side of the core 2 and symmetrically about the core 2.

[0055] Two jacks 1 are placed at the bottom of both the low-pressure side clamp 4 and the high-pressure side clamp 5, and the four jacks 1 are located at the four corners of a rectangle.

[0056] Specifically, the four jacks are arranged at the four corners of a rectangle in plan view.

[0057] Two jacks 1 are placed under the clamping module 6 installed between two adjacent first reinforcing plates 11.

[0058] An auxiliary pressure plate 7 is placed under the jack 1. The two jacks 1 are placed symmetrically about the clamping module 6, avoiding the end wire outlet opening on the coil pressure plate 3.

[0059] The jacks at the twelve clamping points need to apply pressure simultaneously and in small increments, with each clamping point forming a stable triangular clamping structure on one side.

[0060] Optionally, the vertical plates and horizontal plates of the first reinforcing plate 11 and the second reinforcing plate 12 are both connected by welding.

[0061] Optionally, the thickness of the vertical plate of the first reinforcing plate 11 and the second reinforcing plate 12 is less than the thickness of the horizontal plate.

[0062] Optionally, both the low-voltage side clamp 4 and the high-voltage side clamp 5 are tangent to the edge of the core 2, and the low-voltage side clamp 4 and the high-voltage side clamp 5 are parallel to each other.

[0063] Optionally, the bottom of the clamping module 6 is at the same height as the bottom of the low-pressure side clamp 4 and the bottom of the high-pressure side clamp 5.

[0064] Optionally, the top of the clamping module 6 is provided with a lifting ring or lifting hole for hoisting.

[0065] Optionally, the fixing hole of the clamping module 6 is a through hole, the threaded mechanism 9 passes through the fixing hole and extends out of the clamping module 6 at both ends, and nuts 10 are installed at both ends of the threaded mechanism 9.

[0066] Optionally, the threaded mechanism 9 is tightened at both ends with hot-dip galvanized double nuts of grade 12.9 to prevent it from jumping out during press-fitting and causing accidents.

[0067] Optionally, the mounting holes on the tooling fixing reinforcing plate 100 are through holes, and the threaded mechanism 9 passes sequentially through the mounting holes on one side of the tooling fixing reinforcing plate 100 of the clamping module 6, the fixing holes on both sides of the clamping module 6, and the mounting holes on the tooling fixing reinforcing plate 100 of the other side of the clamping module 6.

[0068] Optionally, at least two threaded mechanisms 9 are mounted on one of the clamping modules 6. Further, multiple threaded mechanisms 9 are installed at equal intervals.

[0069] Optionally, the thickness of steel plate 8 is 30 mm.

[0070] Optionally, a 0.5mm thick clean cardboard is placed between the thick steel plate 8 and the coil pressure plate 3, which is removed after pressing is completed.

[0071] Optionally, the thickness of the auxiliary pressure plate 7 is not less than 50 mm.

[0072] Optionally, the threads at both ends of the thread mechanism 9 are at least 50 mm long.

[0073] Optionally, the diameter of the thread mechanism 9 is smaller than the diameter of the opening on the tooling fixing reinforcing plate 100.

[0074] Optionally, the thread mechanism 9 is a screw.

[0075] Example 2 A method for using a twelve-point clamping fixture for a transformer body includes the following steps: Determine the positions of twelve clamping points between the two first reinforcing plates 11, so that the jack 1 is in just contact with each tooling, and so that the twelve clamping points are simultaneously and evenly stressed.

[0076] At the same time, pressure is applied to the twelve jacks 1, slowly and repeatedly, to compress the coil to the preset height.

[0077] After completion, tighten the clamps and remove the clamping fixtures for jack 1 and transformer body.

[0078] During the clamping process, the tooling fixing reinforcing plate 100 can be retained as a clamping corner plate, and the auxiliary pressure plate 7 under the first reinforcing plate 11 and the second reinforcing plate 12 can be retained as an upper corner plate pad.

[0079] A 30mm thick steel plate 8 and a 0.5mm insulating cardboard are placed between the jack 1 and the coil pressure plate 3. The elastic deformation of the steel plate 8 transmits the edge pressure to the central area, eliminating local stress concentration and avoiding the risk of crushing, while also increasing the stress on the coil pressure plate 3 inside the clamp. The original clamping angle plate of the clamp is reused as a fixing base, and combined with the double-headed thread mechanism 9 and double nuts 10, quick assembly and disassembly are achieved. The clamping module 6 adopts a modular design, which is simple in structure, low in cost, and reusable. The combination of the first reinforcing plate 11 and the second reinforcing plate 12 can effectively increase the clamping points. The compact tooling structure replaces the commonly used intermediate long rod force transmission structure in the prior art, avoiding the clamping failure problem caused by the deformation of the long rod. The clamping module 6 of this invention has an auxiliary pressure plate 7, which can be easily matched with the jack 1 to disperse the single-point clamping stress. In addition, the clamping module 6 has a large lateral span, and multiple jacks 1 can be used when necessary to avoid the influence of the lead wire exiting. At the same time, the addition of the lifting ring or lifting hole structure can effectively save assembly time and reduce assembly difficulty.

[0080] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A twelve-point clamping fixture for a transformer body, characterized in that, include: The first reinforcing plate (11) and the second reinforcing plate (12) are respectively provided on the left and right sides of the top center of the transformer coil pressure plate (3); the second reinforcing plate (12) is provided on the outside of the first reinforcing plate (11); a low-voltage side clamp (4) is provided on one side of the front and rear sides of the top center of the coil pressure plate (3), and a high-voltage side clamp (5) is provided on the other side; the first reinforcing plate (11) includes a horizontal plate with two vertically connected vertical plates at both ends, and the second reinforcing plate (12) includes a vertical plate and a horizontal plate that are vertically connected to each other; the two first reinforcing plates (11) located on the left and right sides of the transformer coil pressure plate (3) are respectively provided on the left and right sides of the transformer coil pressure plate (3), and are located on the outside of the first reinforcing plate (11); the second reinforcing plate (12) is provided on the left and right sides of the transformer coil pressure plate (3), and is provided ... The front and rear ends of the coil pressure plate (3) of the transformer are connected by a clamping module (6), and at least two jacks (1) can be placed at the bottom of the clamping module (6); the two second reinforcing plates (12) located on the left and right sides of the coil pressure plate (3) of the transformer are connected by a clamping module (6) and a first reinforcing plate (11) at the front and rear ends of the coil pressure plate (3) of the transformer, and at least one jack (1) can be placed at the bottom of the clamping module (6); at least one jack (1) can be set at the left and right ends of the low-voltage side clamp (4) located at the top center of the coil pressure plate (3); at least one jack (1) can be set at the left and right ends of the high-voltage side clamp (5) located at the top center of the coil pressure plate (3).

2. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, The coil pressure plate (3) has a through hole in the center, and the core column end of the transformer core (2) passes through the through hole of the coil pressure plate (3).

3. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, The two first reinforcing plates (11) are parallel to each other; the two second reinforcing plates (12) are parallel to each other; the first reinforcing plates (11) and the second reinforcing plates (12) are parallel to each other.

4. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, The bottom of the clamping module (6), the bottom of the low-pressure side clamp (4), and the bottom of the high-pressure side clamp (5) are all at the same height.

5. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, The top of the clamping module (6) is provided with a lifting ring or lifting hole for hoisting.

6. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, The clamping module (6) has a fixing hole, and the two sides of the clamping module (6) are fixedly connected to the first reinforcing plate (11) or the second reinforcing plate (12) through a threaded mechanism (9) installed in the fixing hole.

7. The transformer body twelve-point clamping fixture according to claim 1, characterized in that, A steel plate (8) is provided below the left and right ends of the top center of the high voltage side clamp (5) and the coil pressure plate (3); a steel plate (8) is provided below the left and right ends of the top center of the low voltage side clamp (4); the top of the steel plate (8) is used to place the jack (1) that supports the high voltage side clamp (5) and the low voltage side clamp (4).

8. A twelve-point clamping fixture for a transformer body according to claim 7, characterized in that, The steel plate (8) is parallel to the second reinforcing plate (12), and the two second reinforcing plates (12) are parallel to each other.

9. A twelve-point clamping fixture for a transformer body according to claim 1, characterized in that, The low-pressure side clamp (4) and the high-pressure side clamp (5) are parallel to each other.

10. A method of using the twelve-point clamping fixture for a transformer body as described in any one of claims 1 to 9, characterized in that, Includes the following steps: The jacks (1) are placed in the predetermined clamping positions so that the jacks (1) are in contact with each tooling but without applying pressure; wherein, at least two jacks (1) are provided at the bottom of each of the two clamping modules (6) between the two first reinforcing plates (11); at least one jack (1) is provided at the bottom of each of the four clamping modules (6) between the first reinforcing plate (11) and the second reinforcing plate (12); at least one jack (1) is provided at each of the left and right ends of the low-pressure side clamp (4) located at the top center of the coil pressure plate (3); at least one jack (1) is provided at each of the left and right ends of the high-pressure side clamp (5) located at the top center of the coil pressure plate (3). At the same time, pressurize at least twelve jacks (1) and slowly pressurize them multiple times. Press the coil to the preset height through the coil pressure plate (3). After completion, tighten the clamps and remove the jack (1) and the twelve-point clamping fixtures on the transformer body.

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