Dry-type transformer low-voltage coil demolding equipment and demolding methods

Abstract

This invention discloses a demolding device and method for low-voltage coils of dry-type transformers. The demolding device includes a frame, a positioning mechanism, an ejection mechanism, and a clamping mechanism. The clamping mechanism is used to hold the coil. The positioning mechanism is located at one end of the clamping mechanism and is used to hold the second mold inside the coil to restrict the second mold from moving away from the ejection mechanism. The ejection mechanism is used to apply a pushing force to the first mold inside the coil to eject the first mold from the coil. This invention, through differentiated demolding with half fixing and half pushing, applies demolding stress to the mold rather than the low-voltage coil body, reducing the occurrence of quality problems such as scratching the coil and coil deformation during demolding, effectively ensuring the appearance quality and structural integrity of the finished coil, and improving the product yield.

Description

Technical Field

[0001] This invention relates to the field of dry-type transformer manufacturing technology, specifically to a dry-type transformer low-voltage coil demolding device and demolding method. Background Technology

[0002] The manufacturing process of the low-voltage coil of a dry-type transformer is as follows: Two inner molds are used as a set. That is, the two molds are combined to form a complete inner mold. Then, the combined mold is placed on a foil winding machine for winding, placing the lead-out bars, and winding again. After that, the outer mold is placed on the inner mold to form a casting space. Resin is poured into the casting space, and after cooling and curing, the low-voltage coil is obtained. Because the inner surface of the coil is in direct contact with the inner mold, and the coil is subjected to high temperature pressing and shaping on the mold, the coil and the inner mold will be very tightly attached, making the disassembly of the inner mold a major challenge.

[0003] In the existing technology, the demolding of low-voltage coils mainly relies on manual operation. The coil is usually simply placed on a platform without effective fixation. The operator knocks the mold to gradually remove it. This method of demolding is inefficient, labor-intensive, and consumes a lot of manpower. Furthermore, improper knocking can easily cause scratches or deformation to the inner surface of the coil. Summary of the Invention

[0004] This invention provides a differentiated dry-type transformer low-voltage coil demolding device and method that is half fixed and half pushed, in order to solve the problems of difficult low-voltage coil demolding and easy damage to the coil in the prior art.

[0005] To address the aforementioned problems, a first aspect of the present invention provides a dry-type transformer low-voltage coil demolding device, comprising a frame, a positioning mechanism, an ejection mechanism, and a clamping mechanism; The clamping mechanism is mounted on the frame and is used to clamp the low-voltage coil body; the positioning mechanism is located at one end of the clamping mechanism and is used to abut against the second mold inside the low-voltage coil to restrict the second mold from moving away from the ejection mechanism; the ejection mechanism is located at the other end of the clamping mechanism and is used to apply a pushing force to the first mold inside the low-voltage coil to eject the first mold from inside the low-voltage coil.

[0006] Preferably, the clamping mechanism includes a first slide rail and a first clamping component and a second clamping component disposed on the first slide rail, wherein the second clamping component and the first clamping component have the same structure.

[0007] Preferably, the clamping mechanism further includes a first power unit, which is velocally connected to the first clamping assembly and the second clamping assembly, for driving the first clamping assembly and the second clamping assembly to move relative to each other or in opposite directions along the first slide rail; the first clamping assembly includes a clamping seat and a clamping plate disposed on the clamping seat.

[0008] Preferably, the side of the clamping plate opposite to the second clamping assembly is provided with an anti-slip pad.

[0009] Preferably, a limiting block is provided at the end of the clamping plate away from the ejection mechanism, and the free end of the limiting block extends a certain length toward the second clamping assembly.

[0010] Preferably, the ejection mechanism includes a second power unit, a second slide rail, and an ejection assembly disposed on the second slide rail, wherein the second power unit and the ejection assembly are connected in a transmission manner.

[0011] Preferably, the ejection assembly includes an ejection seat and an ejector rod connected to the ejection seat.

[0012] Preferably, the ejector seat is provided with a transverse sliding groove, one end of the ejector rod is slidably connected to the transverse sliding groove, and the other end extends toward the clamping mechanism.

[0013] Preferably, the frame is provided with a first positioning pin hole and a second positioning pin hole, and the positioning mechanism is detachably connected to the first positioning pin hole or the second positioning pin hole.

[0014] Another aspect of the present invention provides a method for demolding a low-voltage coil, which uses a dry-type transformer low-voltage coil demolding device for demolding; the method includes the following steps: Step 1: Fix the low-voltage coil to be demolded using the clamping mechanism, and make the positioning mechanism abut against the second mold, with the ejection mechanism opposite to the first mold; Step 2: Start the ejection mechanism and apply axial thrust to the first mold. After the first mold is axially separated from the low-voltage coil, the ejection mechanism resets. Step 3: Remove the positioning mechanism and align the ejection mechanism with the second mold, then apply an axial thrust to the second mold to axially separate it from the low-voltage coil.

[0015] The above-described technical solution of the present invention has the following beneficial technical effects: This invention provides a demolding device and method for low-voltage coils of dry-type transformers, wherein the demolding device includes a frame, a positioning mechanism, an ejection mechanism, and a clamping mechanism; The clamping mechanism is mounted on the frame and is used to clamp the low-voltage coil body. The positioning mechanism is located at one end of the clamping mechanism and is used to abut against the second mold inside the low-voltage coil to restrict the second mold from moving away from the ejection mechanism. The ejection mechanism is located at the other end of the clamping mechanism and is used to apply a pushing force to the first mold inside the low-voltage coil to eject the first mold from inside the low-voltage coil. This invention, through differentiated demolding with half fixed and half pushing, applies demolding stress to the mold rather than the low-voltage coil body, reducing the occurrence of quality problems such as scratching the low-voltage coil and deformation during demolding, effectively ensuring the appearance quality and structural integrity of the finished coil and improving the product yield. In addition, the tooling structure is simple, the manufacturing cost is low, and it is easy to manufacture and deploy on site, effectively solving the problems of serious manpower waste, low work efficiency, and quality risks in existing demolding operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the lead-out positioning device in the first direction of the present invention (clamping a low-voltage coil). Figure 2 This is a schematic diagram of the second orientation of the lead-out positioning device in this invention (clamping a low-voltage coil). Figure 3 This is a schematic diagram of the third orientation of the outlet positioning device in this invention; Figure 4 This is a schematic diagram of the fourth direction of the outlet positioning device in this invention.

[0017] Labels in the attached diagram: 1. Frame; 11. First locating pin hole; 12. Second locating pin hole; 2. Positioning mechanism; 3. Ejection mechanism; 31. Second power unit; 32. Second slide rail; 33. Ejection assembly; 331. Ejection seat; 332. Ejector rod; 333. Transverse slide groove; 4. Clamping mechanism; 41. First slide rail; 42. First clamping assembly; 421. Clamping seat; 422. Clamping plate; 423. Anti-slip pad; 424. Limiting block; 43. Second clamping assembly; 44. First power unit; 101. Low-voltage coil; 102. First mold; 103. Second mold. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0019] See Figures 1 to 4 The first aspect of the present invention provides a low-voltage coil demolding device for a dry-type transformer, comprising a frame 1, a positioning mechanism 2, an ejection mechanism 3, and a clamping mechanism 4; the clamping mechanism 4 is disposed on the frame and is used to clamp the body of the low-voltage coil 101; the positioning mechanism 2 is disposed at one end of the clamping mechanism 4 and is used to abut against a second mold 103 inside the low-voltage coil 101 to restrict the second mold 103 from moving away from the ejection mechanism 3; the ejection mechanism 3 is disposed at the other end of the clamping mechanism 4 and is used to apply a pushing force to a first mold 102 inside the low-voltage coil 101 to eject the first mold 102 from inside the low-voltage coil 101. This invention employs a differentiated demolding method that involves half fixing and half pushing, applying demolding stress to the mold rather than the low-voltage coil 101 body. This reduces the occurrence of quality problems such as scratching the low-voltage coil 101 and deformation during demolding, effectively ensuring the appearance quality and structural integrity of the finished coil and improving product yield. Furthermore, this tooling has a simple structure, low manufacturing cost, and is easy to manufacture and deploy on-site, effectively solving problems such as serious manpower waste, low work efficiency, and potential quality risks in existing demolding operations.

[0020] During the actual demolding operation of the low-voltage coil 101 of the dry-type transformer, the low-voltage coil 101 to be demolded is first hoisted to the clamping mechanism 4. The clamping mechanism 4 clamps and fixes the body of the low-voltage coil 101. At this time, the positioning mechanism 2 abuts against the second mold 103 inside the low-voltage coil 101 to be demolded, restricting the axial movement of the second mold 103 away from the ejection mechanism 3. Then, the ejection mechanism 3 is activated. The ejection mechanism 3 advances at a constant speed in the direction toward the clamping mechanism 4, applying a thrust to the first mold 102 inside the low-voltage coil 101 to be demolded, and smoothly ejecting the first mold 102 from the inside of the low-voltage coil 101. Because the pushing stress is all applied to the first mold 102, the body of the low-voltage coil 101 is only under stable clamping and limiting, and will not bear additional pushing external force. During the entire demolding process, the coil will not deform or be scratched or damaged by the inner wall of the mold. After ejection is completed, the ejection mechanism 3 is reset; the positioning mechanism 2 is removed, and then the second mold 103 is ejected from the low-voltage coil 101 through the ejection mechanism 3 to complete the mold removal work.

[0021] See Figure 1 and Figure 2Preferably, the clamping mechanism 4 includes a first slide rail 41 and a first clamping assembly 42 and a second clamping assembly 43 disposed on the first slide rail 41. The second clamping assembly 43 and the first clamping assembly 42 have the same structure. The first clamping assembly 42 and the second clamping assembly 43 can be driven by a combination of a lead screw and a linear guide pair. The first slide rail 41 includes two linear guide pairs arranged parallel to each other at a predetermined distance. The first clamping assembly 42 is slidably connected to the slide rail of the linear guide pair via a slider. The second clamping assembly 43 is also slidably connected to the slide rail of the linear guide pair via a slider. The lead screw is disposed on the frame 1, and two clamping assemblies are provided on the lead screw. Each sliding connector is connected to the first clamping assembly 42 and the second clamping assembly 43 respectively. The lead screw is a bidirectional lead screw. When the lead screw is rotated, the first clamping assembly 42 and the second clamping assembly 43 move towards each other or away from each other. The lead screw can be driven manually or by a power unit. Manually, a turntable is set at one end of the lead screw. Rotating the turntable will rotate the lead screw, thereby driving the first clamping assembly 42 and the second clamping assembly 43 to move. If a power unit is used for driving, only one power unit is needed. The power unit can be a servo motor, a stepper motor, or a regular motor.

[0022] Preferably, the clamping mechanism 4 further includes a first power unit 44, which is tractively connected to the first clamping assembly 42 and the second clamping assembly 43, and is used to drive the first clamping assembly 42 and the second clamping assembly 43 to move relative to each other or in opposite directions along the first slide rail 41; the first clamping assembly 42 includes a clamping seat 421 and a clamping plate 422 disposed on the clamping seat 421. The clamping action of the clamping mechanism 4 can be driven by a stepper motor or a servo motor.

[0023] Preferably, the clamping plate 422 and the second clamping assembly 43 are provided with an anti-slip pad 423 on their opposite sides; the clamping surface of the anti-slip pad 423 is an arc-shaped clamping pad block adapted to the outer diameter of the low-voltage coil 101, and the anti-slip pad 423 is a flexible anti-slip pad 423 layer. The anti-slip pad 423 can be made of sponge or latex, which can increase the clamping friction to prevent the coil from shifting, and can also prevent excessive clamping force from damaging the outer insulation layer of the coil; during operation, according to the outer diameter of the low-voltage coil 101 to be demolded, the distance between the first clamping assembly 42 and the second clamping assembly 43 on the first slide 41 is adjusted, the coil is placed between the two sets of clamping assemblies, and the two sets of clamping assemblies are driven to move towards each other along the first slide 41 until the arc-shaped pad block is pressed against the outer wall of the coil, thus completing the clamping and fixing of the coil; or the anti-slip pad 423 is locked to the clamping plate 422 by bolts.

[0024] Preferably, a limiting block 424 is provided at the end of the clamping plate 422 away from the ejection mechanism 3, and the free end of the limiting block 424 extends a certain length toward the second clamping assembly 43. When the first clamping assembly 42 and the second clamping assembly 43 move toward each other to clamp the coil, the limiting block 424 can limit and block the low-voltage coil 101 from the axial direction, so as to prevent the coil from moving axially during clamping or demolding. At the same time, the clamping force of the first clamping assembly 42 and the second clamping assembly 43 on the coil can be appropriately reduced to avoid excessive clamping force causing coil deformation, further improving the stability and safety of the clamping process. Together with the arc-shaped anti-slip pad 423 layer, the coil is positioned from both radial clamping and axial limiting directions, so as to prevent the coil from shifting during demolding and affecting the demolding operation. Understandably, with the limit block 424 on the clamping plate 422, the movement of the first clamping assembly 42 and the second clamping assembly 43 can be driven manually or automatically by a motor or cylinder. Manual operation can also prevent the low-voltage coil 101 from being damaged due to uncontrolled automatic drive. If there is no limit block 424, an appropriate clamping force needs to be applied to the first clamping assembly 42 and the second clamping assembly 43 by a motor or cylinder to prevent the low-voltage coil 101 from being axially displaced during the ejection of the mold.

[0025] See Figure 3 and Figure 4 Preferably, the ejection mechanism 3 includes a second power unit 31, a second slide rail 32, and an ejection assembly 33 disposed on the second slide rail 32. The second power unit 31 and the ejection assembly 33 are connected by a transmission. The second power unit 31 can be a stepper motor, a cylinder, or a hydraulic cylinder. If a motor is used as the second power unit 31, a direction converter is also required to convert the rotational output of the motor into a linear reciprocating output. This can be a motor plus a lead screw. Cylinders and hydraulic cylinders can be directly driven in a linear reciprocating manner. The second slide rail 32 includes two slide rails spaced at a predetermined distance on the frame 1 and a plurality of sliders disposed on the slide rails. The ejection assembly 33 is connected to the sliders and is driven by the second power unit 31 to reciprocate along the axial direction of the slide rails.

[0026] In use, the second power unit 31 drives the ejector assembly 33 to move along the second slide rail 32 toward the clamped and fixed low-voltage coil 101. The front end of the ejector assembly 33 is aligned with the mold component to be removed inside the coil. As the ejector assembly 33 continues to advance, it can smoothly eject and separate the mold from the inside of the coil. Compared with manual mold removal, it not only reduces the labor intensity of the operators, but also avoids damage to the mold or coil due to uneven force. The second slide rail 32 can guide and limit the movement path of the ejector assembly 33 to ensure that the ejection direction is always consistent with the axis of the coil, avoid deviation during ejection, and improve the stability of ejection and mold removal.

[0027] Preferably, the ejection assembly 33 includes an ejection seat 331 and an ejector rod 332 connected to the ejection seat 331; the ejection seat 331 is connected to the output end of the second power unit 31 and moves back and forth along the second slide rail 32 as a whole; the ejector rod 332 is vertically fixed on the side of the ejection seat 331 facing the coil. In use, the diameter and extension length of the ejector rod 332 can be adjusted according to the inner diameter of the coil and the size of the mold to be removed, so as to adapt to the demolding requirements of low voltage coils 101 of different specifications and improve the versatility of the equipment.

[0028] Preferably, the ejector seat 331 is provided with a transverse sliding groove 333, one end of the ejector rod 332 is slidably connected to the transverse sliding groove 333, and the other end extends toward the clamping mechanism 4. It can be understood that the inner mold for making the low-voltage coil 101 is a two-piece set. After ejecting the first mold 102, it is also necessary to eject the second mold 103. The function of setting the transverse sliding groove 333 is that after the ejector rod 332 ejects the first mold 102, the ejector rod 332 is adjusted to a position opposite to the second mold 103, the positioning mechanism 2 is removed, and the ejection mechanism 3 is restarted to eject the second mold 103. Compared with moving the low-voltage coil 101 to make the second mold 103 correspond to the ejector rod 332, it has the advantage of convenient operation.

[0029] Preferably, the frame 1 is provided with a first positioning pin hole 11 and a second positioning pin hole 12, and the positioning mechanism 2 is detachably connected to the first positioning pin hole 11 or the second positioning pin hole 12. The purpose of the detachable connection between the positioning mechanism 2 and the first positioning pin hole 11 and the second positioning pin hole 12 is that the mold inside the low-voltage coil 101 is composed of two molds combined into one, and both molds need to be removed. After the first mold 102 is removed, the axial positioning of the second mold 103 by the positioning mechanism 2 needs to be released so that the second mold 103 can be ejected by the ejection mechanism 3. It can be understood that in the two-piece inner mold, one mold has one end larger than the other, while the other mold has one end smaller than the other. By aligning the small end of one mold with the large end of the other mold, and aligning the large end of one mold with the small end of the other mold, the small end of one mold can be easily removed during demolding. A pushing force is applied at the large end to push out this piece of mold. The low-voltage coil 101 of the dry-type transformer is relatively large in volume and heavy in weight. After the workers hoist the low-voltage coil 101 onto the clamping mechanism 4 using lifting equipment, adjusting the guard line of the low-voltage coil 101 is very troublesome. At this time, the order of pushing out the two molds can be observed. If the end of the first mold 102 closest to the ejection mechanism 3 is the small end, then the first mold 102 must be pushed out first. Otherwise, the second mold 103 needs to be pushed out first. When the first mold 102 must be pushed out first, the positioning mechanism 2 is installed in the positioning pin hole opposite to the second mold 103. After the first mold 102 is pushed out, the positioning mechanism 2 is removed, and the position of the ejector rod 332 is adjusted so that the ejector rod 332 corresponds to the second mold 103. The ejection mechanism 3 then applies a pushing force to the second mold 103 to separate the second mold 103 from the low-voltage coil 101.

[0030] Another aspect of the present invention provides a method for demolding a low-voltage coil 101, which uses a dry-type transformer low-voltage coil demolding device for demolding; the method includes the following steps: Step 1: Fix the low-voltage coil 101 to be demolded using the clamping mechanism 4, and make the positioning mechanism 2 abut against the second mold 103, with the ejection mechanism 3 facing the first mold 102. Specifically, hoist the low-voltage coil 101 to be demolded as a whole to the clamping mechanism 4, adjust the distance between the first clamping assembly 42 and the second clamping assembly 43 according to the outer diameter of the coil, place the coil between the two sets of clamping assemblies, and drive the two sets of clamping assemblies to move towards each other along the first slide 41 until the anti-slip pad 423 on the clamping plate 422 is pressed against the outer wall of the coil, and at the same time, the limiting block 424 abuts against the end of the coil away from the ejection mechanism 3 from the axial direction, thus completing the clamping and fixing of the coil. Install the positioning mechanism 2 in the positioning pin hole corresponding to the second mold 103 on the frame 1, so that the positioning mechanism 2 abuts against the second mold 103, restricting its axial movement at the end away from the ejection mechanism 3. At this time, the push rod 332 of the ejection mechanism 3 is aligned with the end face to be pushed of the first mold 102.

[0031] Step 2: Start the ejection mechanism 3 and apply axial thrust to the first mold 102. After the first mold 102 is axially separated from the low-voltage coil 101, the ejection mechanism 3 resets. The second power unit 31 drives the ejection assembly 33 to advance at a constant speed along the second slide 32 toward the clamping mechanism 4. The ejector rod 332 smoothly ejects the first mold 102 from inside the low-voltage coil 101 until the first mold 102 is completely separated from the coil, and the ejection mechanism 3 resets.

[0032] Step 3: Remove the positioning mechanism 2 and align the ejector mechanism 3 with the second mold 103. Apply axial thrust to the second mold 103 to axially separate it from the low-voltage coil 101. Adjust the horizontal position of the ejector rod 332 by sliding it along the transverse groove 333 on the ejector seat 331 according to the position of the second mold 103, so that the ejector rod 332 is aligned with the end face to be pushed of the second mold 103. Restart the ejector mechanism 3, and the ejector rod 332 will eject the second mold 103 from inside the low-voltage coil 101, completing all demolding work. Reset the ejector mechanism 3, release the clamping mechanism 4, and lift the demolded low-voltage coil 101 away from the equipment.

[0033] In summary, the present invention provides a dry-type transformer low-voltage coil demolding device, including a frame 1 and a positioning mechanism 2, an ejection mechanism 3 and a clamping mechanism 4 for clamping the low-voltage coil 101, which are mounted on the frame 1. The positioning mechanism 2 is located at one end of the clamping mechanism 4 and the ejection mechanism 3 is located at the other end of the clamping mechanism 4, and can move toward the clamping mechanism 4 or toward the opposite direction.

[0034] With the above structure, a differentiated demolding method of "half fixed and half pushed" is adopted, so that the demolding stress is applied to the mold rather than the coil body, avoiding the coil from bearing the external force of pushing, thereby significantly reducing quality problems such as scratches and deformation, ensuring the integrity of the coil appearance and structural stability, and improving product yield.

[0035] The ejection mechanism 3 advances at a constant speed along the slide, and with the stable clamping of the clamping mechanism 4 and the axial limiting of the positioning mechanism 2, it ensures that the ejection direction is always consistent with the coil axis, avoiding skewing or uneven force, and achieving smooth separation of the mold and the coil.

[0036] The overall tooling design is simple, with low manufacturing and maintenance costs, and is easy to manufacture and deploy on site. It adopts a bidirectional lead screw to drive two sets of clamping components to move in opposite or opposite directions, which can accommodate low-voltage coils 101 with different outer diameters. The clamping plate 422 is equipped with an arc-shaped flexible anti-slip pad 423 (sponge or latex), which increases friction to prevent coil displacement and avoids damage to the insulation layer. The limiting block 424 can axially abut against the end of the coil to prevent the coil from moving during demolding, while allowing the clamping force to be appropriately reduced to reduce the risk of coil deformation.

[0037] The diameter and extension length of the ejector rod 332 can be adjusted according to the inner diameter of the coil and the size of the mold to accommodate products of various specifications. The ejector seat 331 is provided with a transverse slide groove 333, and the position of the ejector rod 332 can be adjusted by sliding, so as to eject the first mold 102 and the second mold 103 in sequence without moving the heavy coil.

[0038] The frame 1 is equipped with two positioning pin holes. The positioning mechanism 2 can be installed in different positions according to the mold ejection sequence (the direction of the large and small ends), flexibly adapting to the sequential removal requirements of the two molds. Mechanized ejection replaces manual mold removal, reducing manpower waste and avoiding damage caused by uneven force during manual operation. At the same time, the operation process is fast and stable. The clamping mechanism 4 can be driven manually (turntable) or electrically (servo / stepper motor). The manual mode can avoid damage to the coil caused by automation failure.

[0039] The steps are clearly defined (fixing → limiting → ejecting the first piece → resetting → adjusting → ejecting the second piece), and with multiple protections such as limiting, anti-slip, and guiding, the quality hazards and safety risks during operation are reduced.

[0040] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A dry-type transformer low-voltage coil demolding apparatus, characterized by: It includes a frame (1), a positioning mechanism (2), an ejection mechanism (3), and a clamping mechanism (4); The clamping mechanism (4) is disposed on the frame and is used to clamp the body of the low-voltage coil (101); the positioning mechanism (2) is disposed at one end of the clamping mechanism (4) and is used to abut against the second mold (103) inside the low-voltage coil (101) to restrict the second mold (103) from moving away from the ejection mechanism (3); the ejection mechanism (3) is disposed at the other end of the clamping mechanism (4) and is used to apply a pushing force to the first mold (102) inside the low-voltage coil (101) to eject the first mold (102) from inside the low-voltage coil (101).

2. The dry-type transformer low-voltage coil demolding apparatus according to claim 1, characterized in that: The clamping mechanism (4) includes a first slide (41) and a first clamping component (42) and a second clamping component (43) provided on the first slide (41). The second clamping component (43) and the first clamping component (42) have the same structure.

3. The dry-type transformer low-voltage coil demolding apparatus according to claim 2, characterized in that: The clamping mechanism (4) further includes a first power unit (44), and the first clamping assembly (42) and / or the second clamping assembly (43) are connected to the first power unit (44) in a transmission manner; the first clamping assembly (42) includes a clamping seat (421) and a clamping plate (422) provided on the clamping seat (421).

4. The dry-type transformer low-voltage coil demolding device according to claim 3, characterized in that: The clamping plate (422) and the second clamping assembly (43) are provided with an anti-slip pad (423) on the opposite side.

5. The dry-type transformer low-voltage coil demolding device according to claim 4, characterized in that: The clamping plate (422) is provided with a limiting block (424) at one end away from the ejection mechanism (3), and the free end of the limiting block (424) extends a certain length toward the second clamping assembly (43).

6. The dry-type transformer low-voltage coil demolding device according to claim 1, characterized in that: The ejection mechanism (3) includes a second power unit (31), a second slide (32), and an ejection assembly (33) provided on the second slide (32). The second power unit (31) and the ejection assembly (33) are connected by a transmission.

7. The dry-type transformer low-voltage coil demolding device according to claim 6, characterized in that: The ejector assembly (33) includes an ejector seat (331) and an ejector rod (332) connected to the ejector seat (331).

8. The dry-type transformer low-voltage coil demolding device according to claim 7, characterized in that: The ejector seat (331) is provided with a transverse sliding groove (333), one end of the ejector rod (332) is slidably connected to the transverse sliding groove (333), and the other end extends toward the clamping mechanism (4).

9. The dry-type transformer low-voltage coil demolding device according to claim 1, characterized in that: The frame (1) is provided with a first positioning pin hole (11) and a second positioning pin hole (12), and the positioning mechanism (2) is detachably connected to the first positioning pin hole (11) or the second positioning pin hole (12).

10. A method for demolding a low-voltage coil (101), characterized in that: Demolding is performed using the dry-type transformer low-voltage coil demolding device according to any one of claims 1 to 9; the method includes the following steps: Step 1: Fix the low-voltage coil (101) to be demolded by clamping mechanism (4), and make positioning mechanism (2) abut against the second mold (103), and ejection mechanism (3) opposite to the first mold (102); Step 2: Start the ejection mechanism (3) and apply axial thrust to the first mold (102) so that the first mold (102) is axially separated from the low-voltage coil (101), and then the ejection mechanism (3) is reset. Step 3: Remove the positioning mechanism (2), and make the ejection mechanism (3) face the second mold (103), and apply an axial thrust to the second mold (103) to make the second mold (103) separate axially from the low voltage coil (101).

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