Oil type transformer with coil pressing function

Abstract

An oil type transformer with a coil pressing function is characterized in that a left coil protection plate and a right coil protection plate are semi-arc-shaped, a gap is formed between the left coil protection plate and the right coil protection plate in a non-working mode, and a coil body is arranged in the gap between the left coil protection plate and the right coil protection plate; the size of the coil body is smaller than the distance between the coil left protection plate and the coil right protection plate, two sets of limiting plates are arranged on the outer wall of the coil left protection plate, positive pole magnetic plates are arranged on the other sides, tightly attached to the coil left protection plate, of the two sets of limiting plates, and buffering pressing damping rods are arranged on the outer walls of the other two sides of the limiting plates. And a fixing plate is arranged at the other end of the buffer pressing damping rod. The semi-arc pressing protection assembly composed of the coil left protection plate and the coil right protection plate can be tightly attached to the outer wall of the coil body in a working mode, a full-wrapping protection structure is formed, and displacement or deformation of the coil body caused by mechanical vibration, electromagnetic force or external impact in the operation process is effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-type transformer auxiliary technology, in particular to an oil-type transformer with a coil pressing function. Background Art

[0002] Oil transformers are indispensable key equipment in power systems, and the stability of their coils directly affects the operating efficiency and safety of the transformer.

[0003] In existing related technologies, the coil is fixed with a simple mechanical clamping structure, which makes it difficult to effectively constrain the axial and radial freedom of the coil. Especially under complex working conditions, the geometric position stability of the coil is poor, and the structure is easily loosened due to long-term vibration or impact, affecting the operating reliability of the transformer.

[0004] In addition, traditional coil clamping devices lack a locking mechanism, and the rigidity of the clamping components is difficult to maintain. They are prone to wear during long-term operation, shortening their service life. At the same time, although some clamping devices use a single drive method, their control accuracy and stability are limited, making it difficult to meet the high requirements for coil clamping reliability and structural stability under complex working conditions. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an oil-type transformer with a coil pressing function to at least partially solve the above technical problems.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides an oil-type transformer with a coil pressing function, comprising:

[0008] A coil compression protection assembly, the coil compression protection assembly comprising a left coil guard plate and a right coil guard plate, the left coil guard plate and the right coil guard plate being shaped as a semi-arc, a gap being provided between the left coil guard plate and the right coil guard plate in a non-working mode, a coil body being provided in the gap between the left coil guard plate and the right coil guard plate, the size of the coil body being smaller than the gap between the left coil guard plate and the right coil guard plate;

[0009] The outer wall of the left guard plate of the coil is provided with a limit plate, and the limit plates are provided in two groups. The two groups of limit plates are closely attached to the other side of the left guard plate of the coil and are provided with a positive magnetic plate. The outer walls on the other two sides of the limit plates are provided with a buffer compression damping rod, and the other end of the buffer compression damping rod is provided with a fixing plate;

[0010] The outer wall of the right guard plate of the coil is provided with a limit frame, and the limit frame is provided with two groups. The outer walls of the two groups of limit frames are provided with electric retractors, and the working ends of the electric retractors are provided through the interior of the limit frame. The working ends of the electric retractors are provided with a touch plate, and the inner wall of the limit frame is also provided with two groups of negative magnetic plates cooperating with the positive magnetic plates.

[0011] In one embodiment of the present invention, the inner wall of the limiting frame is further provided with an electric retractor control button, and the electric retractor control button is electrically controlled and connected to the electric retractor through a conductive line;

[0012] When the left coil guard plate and the right coil guard plate are in working mode, the limit plate is inserted into the interior of the limit frame, the working end of the electric retractor drives the touch plate to fit the fixed plate, and the limit plate is fixed inside the limit frame. The size of the limit plate is smaller than the internal space size of the limit frame.

[0013] In one embodiment of the present invention, an oil-type transformer body is provided on the outside of the coil body, and coil through-holes are provided on both sides of the oil-type transformer body. The diameter of the coil through-holes is larger than the diameter of the coil body. In the working mode, the left coil guard plate and the right coil guard plate are merged and closely attached to the outer wall of the coil body.

[0014] In one embodiment of the present invention, a hydraulic cylinder is provided at the bottom of the oil-type transformer body. There are two groups of hydraulic cylinders, and the working ends of the two groups of hydraulic cylinders are respectively provided on the outer walls of the left and right coil guard plates.

[0015] In one embodiment of the present invention, a coil defining ring is provided on the outside of the oil-type transformer body. Two groups of coil defining rings are provided. Two sections of the coil body are inserted into the interiors of the two groups of coil defining rings. The diameters of the two groups of coil defining rings are larger than the diameter of the coil body. Multiple groups of L-shaped telescopic rods are provided on the outer walls of the coil defining rings. The other ends of the multiple groups of L-shaped telescopic rods are respectively provided on the inner walls of the coil through-holes.

[0016] In one embodiment of the present invention, a control panel is provided on the outer wall of the oil-type transformer body, and the control panel is electrically controlled and connected to the electric expansion joint, the oil-type transformer body and the hydraulic cylinder through conductive wires.

[0017] In one embodiment of the present invention, a hydraulic cylinder control button is provided on the inner wall of the coil defining ring, and the hydraulic cylinder control button is electrically controlled and connected to the hydraulic cylinder via a conductive line.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] The present invention utilizes a semi-arc-shaped compression protection assembly consisting of left and right coil guards that tightly adhere to the outer wall of the coil body in operating mode, forming a fully enclosed protective structure. This effectively prevents the coil body from displacement or deformation due to mechanical vibration, electromagnetic force, or external impact during operation. Furthermore, the coil restraining ring and L-shaped telescopic rod further constrain the axial and radial degrees of freedom of the coil body, ensuring that the coil maintains a stable geometric position even under complex operating conditions, thereby reducing the risk of localized overheating, insulation aging, or short circuits caused by coil loosening.

[0020] The present invention adopts a dual drive mechanism of hydraulic cylinder and electric expander, and realizes automatic electrical control of the device through the hydraulic cylinder control button and the electric expander control button. The hydraulic cylinder drives the left and right guard plates of the coil to merge and fit the coil body in the working mode, and the electric expander further locks the relative position of the limit plate and the limit frame through the contact between the touch plate and the fixed plate. The multi-stage clamping and locking mechanism not only ensures the reliability of coil clamping, but also improves operational efficiency through automated control and reduces the need for manual intervention.

[0021] This invention utilizes a positive and negative magnetic plate to provide magnetically assisted positioning for the insertion of the retaining plate into the retaining frame. In operating mode, the magnetic force enhances the plate's stability within the retaining frame, reducing minor displacements caused by mechanical play or vibration. This magnetic assistance mechanism not only improves assembly precision of the clamping assembly but also maintains structural rigidity during long-term operation, extending the service life of key components.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a schematic structural diagram of the left coil guard plate of an oil-type transformer with a coil pressing function proposed in an embodiment of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the coil right guard plate of an oil-type transformer with a coil pressing function proposed in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the first structure of an oil-type transformer with a coil pressing function proposed in an embodiment of the present invention;

[0027] Figure 4 This is a second structural schematic diagram of an oil-type transformer with a coil pressing function proposed in an embodiment of the present invention;

[0028] Figure 5 This is a front view of an oil-type transformer with a coil pressing function proposed in an embodiment of the present invention;

[0029] Figure 6 A side view of an oil-type transformer with a coil pressing function according to an embodiment of the present invention;

[0030] Figure 7 A top view of an oil-type transformer with a coil pressing function according to an embodiment of the present invention;

[0031] Figure 8 for Figure 5 A cross-sectional view along the cutting line AA;

[0032] Figure 9 for Figure 6 A cross-sectional view along the cutting line BB;

[0033] Figure 10 for Figure 7 Cross-sectional view along cutting line CC.

[0034] Figure: 1. Coil compression protection assembly; 2. Coil left guard plate; 3. Limit plate; 4. Positive magnetic plate; 5. Negative magnetic plate; 6. Buffer compression damping rod; 7. Fixing plate; 8. Coil right guard plate; 9. Limit frame; 10. Electric expander; 11. Touch panel; 12. Electric expander control button; 13. Coil body; 14. Oil transformer body; 15. Control panel; 16. Hydraulic cylinder; 17. Coil limiting ring; 18. L-shaped expansion rod; 19. Hydraulic cylinder control button; 20. Coil perforation. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0036] An oil-type transformer with a coil pressing function according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0037] like Figures 1 to 10As shown, an embodiment of the present invention provides an oil-type transformer with a coil pressing function, comprising: a coil pressing protection assembly 1, the coil pressing protection assembly 1 comprising a coil left guard plate 2 and a coil right guard plate 8, the coil left guard plate 2 and the coil right guard plate 8 being configured in a semi-arc shape, a gap being provided between the coil left guard plate 2 and the coil right guard plate 8 in a non-working mode, a coil body 13 being provided in the gap between the coil left guard plate 2 and the coil right guard plate 8, the size of the coil body 13 being smaller than the gap between the coil left guard plate 2 and the coil right guard plate 8;

[0038] A limit plate 3 is provided on the outer wall of the left guard plate 2 of the coil. There are two groups of limit plates 3. The two groups of limit plates 3 are closely attached to the other side of the left guard plate 2 of the coil and are provided with a positive magnetic plate 4. The outer walls on the other two sides of the limit plates 3 are provided with a buffer compression damping rod 6. The other end of the buffer compression damping rod 6 is provided with a fixing plate 7.

[0039] The outer wall of the right guard plate 8 of the coil is provided with a limit frame 9, and the limit frame 9 is provided with two groups. The outer walls of the two groups of limit frames 9 are provided with an electric retractor 10. The working end of the electric retractor 10 passes through the interior of the limit frame 9. The working end of the electric retractor 10 is provided with a touch plate 11. The inner wall of the limit frame 9 is also provided with two groups of negative magnetic plates 5 cooperating with the positive magnetic plate 4.

[0040] In a specific application of an embodiment of the present invention, the coil clamping protection assembly 1 includes a coil left guard plate 2 and a coil right guard plate 8, both of which are configured as a semi-arc structure to adapt to the cylindrical outer contour of the coil body 13. The semi-arc shape not only allows for a close fit on the outer surface of the coil body 13, but also evenly distributes the clamping force to avoid local stress concentration. In the non-operating mode, a certain distance is reserved between the coil left guard plate 2 and the coil right guard plate 8. This distance is slightly larger than the outer diameter of the coil body 13 to ensure that the coil body 13 can be easily installed between the two guard plates, while also providing space for subsequent clamping operations. Two sets of limit plates 3 are provided on the outer wall of the coil left guard plate 2. The limit plates 3 are arranged axially or radially along the outer surface of the coil left guard plate 2 to limit the displacement of the clamping assembly during operation and ensure the transmission of the clamping force. One side of the limit plate 3 is in close contact with the coil left guard plate 2, and the other side is provided with a positive magnetic plate 4. The positive magnetic plate 4 generates an attractive force with the negative magnetic plate 5 on the coil right guard plate 8 through magnetic force, thereby assisting the mechanical clamping mechanism and further enhancing the clamping effect.

[0041] Two sets of limit frames 9 are provided on the outer wall of the right guard plate 8 of the coil. The limit frames 9 serve as the mounting base of the electric expander 10, which is used to constrain the movement trajectory of the expander and ensure the directionality and stability of the clamping force. An electric expander 10 is fixed on the outer wall of each set of limit frames 9. The working end of the electric expander 10 passes through the interior of the limit frame 9 and is connected to the touch plate 11.

[0042] In addition, buffering compression damping rods 6 are respectively provided on the outer walls on the other two sides of the limit plate 3. One end of the buffering compression damping rod 6 is fixed to the limit plate 3. Under the operation of the electric telescoping device 10, the fixed plate 7 is pushed to move inside the limit frame 9, so that the fixed plate 7 fits the limit plate 3. The buffering compression damping rod 6 adopts an elastic or hydraulic structure with damping characteristics, which can absorb vibration energy during the compression process and slow down the instantaneous impact of the compression force, thereby fixing the limit plate 3 inside the limit frame 9.

[0043] The inner wall of the limiting frame 9 is also provided with two groups of negative magnetic plates 5, which are arranged opposite to the positive magnetic plates 4 on the left guard plate 2 of the coil. When the electric expander 10 drives the touch plate 11 close to the coil body 13, the magnetic attraction between the positive magnetic plate 4 and the negative magnetic plate 5 gradually increases, further assisting the touch plate 11 to press the coil body 13, reducing the energy consumption of the electric expander 10, and improving the smoothness of the pressing process.

[0044] In working mode, the electric expander 10 is activated, pushing the fixed plate 7 to move inside the limit frame 9, so that the fixed plate 7 fits against the limit plate 3, fixing the limit plate 3 inside the limit frame 9. At the same time, the magnetic attraction between the positive magnetic plate 4 and the negative magnetic plate 5 is enhanced, and the auxiliary coil left guard plate 2 and the coil right guard plate 8 move closer to the coil body 13, forming a bidirectional compression effect. The buffer compression damping rod 6 absorbs the vibration and impact force during the compression process through its damping characteristics, ensuring that the coil body 13 is evenly stressed and avoiding deformation or damage caused by excessive compression or instantaneous impact.

[0045] In the non-working mode, the electric retractor 10 retracts, the clamping force between the touch plate 11 and the limit plate 3 is released, the limit plate 3 is moved out from the inside of the limit frame 9, and the coil left guard plate 2 and the coil right guard plate 8 are restored to the initial spacing state, which facilitates the installation, disassembly or maintenance of the coil body 13.

[0046] In a possible embodiment, the inner wall of the limit frame 9 is further provided with an electric retractor control button 12, which is electrically controlled and connected to the electric retractor 10 through a conductive line; a hydraulic cylinder 16 is provided at the bottom of the oil-type transformer body 14, and two groups of hydraulic cylinders 16 are provided. The working ends of the two groups of hydraulic cylinders 16 are respectively provided on the outer walls of the coil left guard plate 2 and the coil right guard plate 8; when the coil left guard plate 2 and the coil right guard plate 8 are in working mode, the limit plate 3 is inserted into the interior of the limit frame 9, and the working end of the electric retractor 10 drives the touch plate 11 to fit the fixed plate 7. The limit plate 3 is fixed to the interior of the limit frame 9, and the size of the limit plate 3 is smaller than the internal space size of the limit frame 9.

[0047] In a specific application of the embodiment of the present invention, an electric retractor control button 12 is provided on the inner wall of the limit frame 9. The electric retractor control button 12 is electrically controlled and connected to the electric retractor 10 through a conductive line, and is used to automatically trigger the working state of the electric retractor 10.

[0048] Two sets of hydraulic cylinders 16 are provided at the bottom of the oil-type transformer body 14, corresponding to the outer walls of the left coil guard plate 2 and the right coil guard plate 8 respectively. The working ends of the hydraulic cylinders 16 directly act on the outer walls of the left coil guard plate 2 and the right coil guard plate 8, providing additional clamping force through hydraulic drive. The hydraulic cylinders 16 and the electric expander 10 form a dual drive mechanism, which can flexibly adjust the clamping force according to the actual force requirements of the coil body 13 to ensure the uniformity and stability of the clamping effect.

[0049] In working mode, the coil left guard plate 2 and the coil right guard plate 8 are driven by the hydraulic cylinder 16 to move closer to the coil body 13, and the limit plate 3 is inserted into the internal space of the limit frame 9 to form a preliminary limit fit. The size of the limit plate 3 is slightly smaller than the internal space size of the limit frame 9, ensuring a smooth insertion process while reserving fine-tuning space for the transmission of the clamping force. The electric retractor 10 is activated by the triggering of the control button, driving the touch plate 11 to move along the inner wall of the limit frame 9 until the touch plate 11 fits the fixed plate 7. At this time, the touch plate 11 transmits the clamping force to the coil left guard plate 2 through the fixed plate 7, further compressing the gap between the coil body 13 and the guard plate. The limit plate 3 is fixed inside the limit frame 9 to limit the radial or axial displacement of the guard plate, ensuring the stability and directionality of the clamping force. The positive magnetic plate 4 and the negative magnetic plate 5 gradually approach each other during the compaction process, the magnetic attraction effect is enhanced, the auxiliary hydraulic cylinder 16 and the electric telescopic device 10 are mechanically compacted, and the buffering compaction damping rod 6 synchronously absorbs the vibration and impact force during the compaction process to protect the structural integrity of the coil body 13.

[0050] In the non-working mode, the hydraulic cylinder 16 and the electric telescopic device 10 retract, the clamping force between the touch plate 11 and the limit plate 3 is released, the limit plate 3 is moved out from the inside of the limit frame 9, and the coil left guard plate 2 and the coil right guard plate 8 are restored to the initial spacing state, which facilitates the installation, disassembly or maintenance of the coil body 13.

[0051] In one possible embodiment, an oil-type transformer body 14 is provided on the outside of the coil body 13, and coil through-holes 20 are opened on both sides of the oil-type transformer body 14. The diameter of the coil through-holes 20 is larger than the diameter of the coil body 13. In the working mode, the coil left guard plate 2 and the coil right guard plate 8 are merged and closely attached to the outer wall of the coil body 13.

[0052] In a specific application of the embodiment of the present invention, the coil body 13 is arranged inside the oil-type transformer body 14. Coil through-holes 20 are symmetrically opened on both sides of the oil-type transformer body 14. The diameter of the coil through-holes 20 is designed to be larger than the diameter of the coil body 13. This not only facilitates the installation and positioning of the coil body 13, but also provides the necessary margin for the slight displacement of the coil body 13 caused by thermal expansion and contraction or mechanical vibration during operation, thereby avoiding stress concentration or structural damage caused by overly tight dimensions.

[0053] The coil left guard plate 2 and the coil right guard plate 8 serve as the compression and protection components of the coil body 13. They are respectively arranged on both sides of the coil body 13 and can realize the merging and sticking functions in the working mode. Specifically, in the working mode, the coil left guard plate 2 and the coil right guard plate 8 are merged with each other. After merging, the inner walls of the coil left guard plate 2 and the coil right guard plate 8 are tightly fitted to the outer wall of the coil body 13, ensuring that the coil body 13 is subjected to a uniform radial clamping force during operation. The application of such a clamping force can effectively suppress the vibration and deformation of the coil body 13 in a high voltage and high current operating environment, thereby reducing the risk of local discharge, insulation aging or mechanical fatigue caused by loose coils. The coil left guard plate 2 and the coil right guard plate 8 are made of high-strength, corrosion-resistant insulating materials or metal materials (with an insulating layer on the surface) to ensure stability and safety during long-term operation in an oil-immersed environment.

[0054] The setting of the coil through-hole 20 complements the pressing function of the coil left guard plate 2 and the coil right guard plate 8. The larger diameter of the coil through-hole 20 provides sufficient space for the installation of the coil body 13 and the merging operation of the guard plates, and the merging and close fitting of the coil left guard plate 2 and the coil right guard plate 8 compensates for the positioning problem caused by the larger size of the through-hole, so that the coil body 13 can maintain a stable geometric position and electrical performance inside the oil-type transformer body 14, and maintain its structural integrity even under long-term operation or extreme working conditions (such as short-circuit shock).

[0055] In one possible embodiment, a coil defining ring 17 is provided on the outside of the oil-type transformer body 14. Two sets of coil defining rings 17 are provided. Two sections of the coil body 13 are inserted into the interiors of the two sets of coil defining rings 17. The diameters of the two sets of coil defining rings 17 are larger than the diameter of the coil body 13. The outer walls of the coil defining rings 17 are provided with multiple sets of L-shaped telescopic rods 18. The other ends of the multiple sets of L-shaped telescopic rods 18 are respectively provided on the inner walls of the coil through-holes 20. A hydraulic cylinder control button 19 is provided on the inner wall of the coil defining ring 17. The hydraulic cylinder control button 19 is electrically connected to the hydraulic cylinder 16 via a conductive line.

[0056] In a specific application of an embodiment of the present invention, two sets of coil restraining rings 17 are provided on the outside of the oil-type transformer body, one corresponding to each end of the coil body 13. The inner diameter of the coil restraining rings 17 is larger than the diameter of the coil body 13, allowing the ends of the coil body 13 to be smoothly inserted into the interior of the two sets of coil restraining rings 17. The coil restraining rings 17 serve as the radial positioning and compression structure for the coil body 13. A gap is formed between the inner wall of the coil restraining rings 17 and the outer wall of the coil body 13. This gap not only facilitates the initial installation of the coil body 13 but also provides operating space for subsequent dynamic compression via hydraulic drive. One end of an L-shaped telescopic rod 18 is fixed to the outer wall of the coil restraining ring 17, and the other end is securely attached to the inner wall of the coil through-hole 20 via a mechanical connection (e.g., riveting or bolting). The L-shaped telescopic rods 18 are retractable, and the even distribution of multiple L-shaped telescopic rods 18 further ensures balanced force on the coil restraining rings 17 during adjustment, allowing the coil restraining rings 17 to stably fit or compress the coil body 13.

[0057] A hydraulic cylinder control button 19 is provided on the inner wall of the coil confinement ring 17. The hydraulic cylinder control button 19 forms an electrical control connection with the hydraulic cylinder 16 via a conductive line. In the working mode, the coil body 13 passes through the interior of the coil confinement ring 17 and contacts the hydraulic cylinder control button 19, causing the hydraulic cylinder 16 to automatically operate. The hydraulic cylinder 16 outputs a corresponding thrust or pull according to the control signal, driving the L-shaped telescopic rod 18 to perform telescopic movement, thereby adjusting the radial position of the coil confinement ring 17 relative to the coil body 13. When it is necessary to compress the coil body 13, the hydraulic cylinder 16 drives the working end to extend, causing the coil left guard plate 2 and the coil right guard plate 8 to merge, so that the inner walls of the coil left guard plate 2 and the coil right guard plate 8 gradually approach and cling to the outer wall of the coil body 13, forming a uniform radial compressive force. When release or adjustment is required, the hydraulic cylinder 16 drives the working end to retract, causing the coil left guard plate 2 and the coil right guard plate 8 to return to their initial position.

[0058] In a possible embodiment, a control panel 15 is provided on the outer wall of the oil-type transformer body 14 , and the control panel 15 is electrically controlled and connected to the electric expansion joint 10 , the oil-type transformer body 14 and the hydraulic cylinder 16 through conductive wires.

[0059] In a specific application of the embodiment of the present invention, the electric expansion joint 10, the oil-type transformer body 14 and the hydraulic cylinder 16 used in the present device are all mature existing technologies. The working principles of the electric expansion joint 10, the oil-type transformer body 14 and the hydraulic cylinder 16 are also well known to those skilled in the art and will not be described in detail here.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An oil-type transformer with coil pressing function, characterized in that: include: A coil pressing protection assembly (1), comprising a coil left guard plate (2) and a coil right guard plate (8), wherein the coil left guard plate (2) and the coil right guard plate (8) are configured in a semi-arc shape, wherein a spacing is provided between the coil left guard plate (2) and the coil right guard plate (8) in a non-working mode, wherein a coil body (13) is provided in the spacing between the coil left guard plate (2) and the coil right guard plate (8), and wherein the size of the coil body (13) is smaller than the spacing between the coil left guard plate (2) and the coil right guard plate (8); The outer wall of the left coil guard plate (2) is provided with a limit plate (3), and the limit plates (3) are provided in two groups. The two groups of limit plates (3) are closely attached to the other side of the left coil guard plate (2) and are provided with a positive magnetic plate (4). The outer walls of the other two sides of the limit plates (3) are provided with a buffering compression damping rod (6), and the other end of the buffering compression damping rod (6) is provided with a fixing plate (7); The outer wall of the coil right guard plate (8) is provided with a limit frame (9), and the limit frame (9) is provided with two groups. The outer walls of the two groups of limit frames (9) are provided with electric retractors (10), and the working ends of the electric retractors (10) are provided through the interior of the limit frame (9). The working ends of the electric retractors (10) are provided with a touch plate (11), and the inner wall of the limit frame (9) is also provided with two groups of negative magnetic plates (5) that cooperate with the positive magnetic plates (4).

2. The oil-type transformer with coil pressing function according to claim 1, characterized in that: An electric telescopic device control button (12) is also provided on the inner wall of the limiting frame (9), and the electric telescopic device control button (12) is electrically controlled and connected to the electric telescopic device (10) via a conductive line; When the coil left guard plate (2) and the coil right guard plate (8) are in working mode, the limit plate (3) is inserted into the interior of the limit frame (9), the working end of the electric retractor (10) drives the touch plate (11) to fit the fixed plate (7), and the limit plate (3) is fixed inside the limit frame (9). The size of the limit plate (3) is smaller than the internal space size of the limit frame (9).

3. The oil-type transformer with coil pressing function according to claim 1, characterized in that: An oil-type transformer body (14) is provided outside the coil body (13), coil through-holes (20) are provided on both sides of the oil-type transformer body (14), and the diameter of the coil through-holes (20) is larger than the diameter of the coil body (13). In the working mode, the left coil guard plate (2) and the right coil guard plate (8) are combined and closely attached to the outer wall of the coil body (13).

4. The oil-type transformer with coil pressing function according to claim 3, characterized in that: A hydraulic cylinder (16) is provided at the bottom of the oil-type transformer body (14). The hydraulic cylinder (16) is provided in two groups. The working ends of the two groups of hydraulic cylinders (16) are respectively provided on the outer walls of the coil left guard plate (2) and the coil right guard plate (8).

5. The oil-type transformer with coil pressing function according to claim 3, characterized in that: A coil limiting ring (17) is provided on the outer side of the oil-type transformer body (14), and the coil limiting ring (17) is provided in two groups. The two sections of the coil body (13) are passed through the inside of the two groups of the coil limiting rings (17). The diameters of the two groups of the coil limiting rings (17) are larger than the diameter of the coil body (13). The outer wall of the coil limiting ring (17) is provided with multiple groups of L-shaped telescopic rods (18), and the other ends of the multiple groups of L-shaped telescopic rods (18) are respectively provided on the inner wall of the coil through hole (20).

6. The oil-type transformer with coil pressing function according to claim 3, characterized in that: A control panel (15) is provided on the outer wall of the oil-type transformer body (14). The control panel (15) is electrically controlled and connected to the electric expansion joint (10), the oil-type transformer body (14) and the hydraulic cylinder (16) through conductive wires.

7. The oil-type transformer with coil pressing function according to claim 3, characterized in that: A hydraulic cylinder control button (19) is provided on the inner wall of the coil limiting ring (17), and the hydraulic cylinder control button (19) is electrically controlled and connected to the hydraulic cylinder (16) via a conductive line.

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