A foil winding casting mold and a foil winding casting method

Abstract

The present invention provides a foil winding casting mold and a foil winding casting method, belonging to the technical field of casting molds. The mold body is provided with a first limiting member at the upper end. The first limiting member has a first limiting portion extending axially along the mold body to the outside of the foil winding surface. The first limiting portion has a first abutting surface for abutting against the connection copper bar. The height of the extending end of the first limiting portion is higher than the highest liquid level for casting the foil wound on the foil winding surface; a second limiting member is detachably connected to the lower end of the mold body and has a second limiting portion extending axially along the mold body to the outside of the foil winding surface. The second limiting portion has a second abutting surface for abutting against the connection copper bar. The foil winding casting mold of the present invention is provided with a first limiting portion and a second limiting portion on the mold body respectively, so as to facilitate the demolding of the mold body after foil winding casting.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer foil winding molds, and in particular to a foil winding casting mold and a foil winding casting method. Background Art

[0002] Currently, for the foil winding mold of the low-voltage side coil of a transformer, a limiting strip is generally constructed on the mold. The limiting strip is provided on the surface of the mold and extends along the axial direction of the mold throughout the mold, so as to facilitate the operation during the copper foil winding process, limit the connection copper bar of the lead wire, and prevent the connection copper bar from skewing.

[0003] Due to the gap between copper foils in the low-voltage copper foil winding, the noise of the transformer increases significantly under load. Casting the low-voltage foil winding coil can not only effectively reduce the noise, but also make the appearance more beautiful.

[0004] However, if casting is carried out, the perpendicularity requirement of the limiting strip is very high (it is impossible to ensure the perpendicularity in practice). If the limiting strip is slightly inclined, the mold and the foil winding cannot be pulled out for demolding; there is also the weld treatment of the limiting strip. Due to vacuum casting, the epoxy resin penetrates into the weld, and demolding will also be impossible. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the low-voltage foil winding casting mold in the prior art cannot be smoothly demolded during demolding, so as to provide a foil winding casting mold and a foil winding casting method that can improve the demolding efficiency.

[0006] To solve the above technical problem, the present invention provides a foil winding casting mold, including:

[0007] A mold body having a foil winding surface for foil winding;

[0008] A first limiting member provided at the upper end of the mold body, having a first limiting portion extending axially along the mold body to the outside of the foil winding surface. The first limiting portion has a first abutting surface for abutting against the connection copper bar, and the height of the extending end of the first limiting portion is higher than the highest liquid level for casting the foil wound on the foil winding surface;

[0009] A second limiting member detachably connected to the lower end of the mold body, having a second limiting portion extending axially along the mold body to the outside of the foil winding surface. The second limiting portion has a second abutting surface for abutting against the connection copper bar.

[0010] Optionally, the first limiting portion is a square steel or a round steel.

[0011] Optionally, a first clamping plate is fixedly provided on the upper end surface of the mold body, and the first clamping plate is used to clamp and fix the wiring copper bar, and the first clamping plate is arranged close to the first limiting part.

[0012] Optionally, the second limiting member includes a supporting part vertically arranged relative to the second limiting part, and the supporting part is detachably connected to the lower end surface of the mold body.

[0013] Optionally, at least one mounting hole is provided on the supporting part, and the supporting part is fixed to the mold body through a fixing member passing through the mounting hole.

[0014] Optionally, the second limiting part includes a first mating surface arranged in contact with the foil winding surface, and a second mating surface with a smooth transition to the foil winding surface on the outside.

[0015] Optionally, the first abutting surface and the second abutting surface are located on the same plane.

[0016] Optionally, the second limiting member further includes a second clamping plate extending downward relative to the supporting part, and the second clamping plate is used to cooperate with an external clamping member at the lower end of the mold body to clamp and fix the wiring copper bar.

[0017] Optionally, a clamping groove for the external clamping member to pass through is provided on the second clamping plate.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. For the foil winding casting mold provided by the present invention, during the foil winding operation, the first limiting member located at the upper end fixes the upper end position of the wiring copper bar, and the second limiting member located at the lower end fixes the lower end position of the wiring copper bar, thereby preventing the wiring copper bar from being skewed by the copper foil during the foil winding process. After the copper foil is wound, the second limiting member can be disassembled to reduce the fixing structure on the mold body. Thus, during the demolding after the overall casting, it can avoid the interference between the protrusion of the fixing structure and the casting body, which is beneficial to the smooth demolding after casting and improves the casting effect.

[0020] 2. For the foil winding casting mold provided by the present invention, the first limiting part is made of square steel or round steel, and can be made by recycling scrap materials, which is convenient for obtaining materials locally and has a low cost.

[0021] 3. For the foil winding casting mold provided by the present invention, a first clamping plate is fixedly provided on the upper end surface of the mold body, which is convenient for the first clamping plate to clamp and fix the wiring copper bar, preventing the wiring copper bar from being skewed by external forces during the foil winding process. And being arranged close to the first limiting part is convenient for the overall assembly of the first limiting member and is beneficial to reducing the interference between the foil winding process and the first clamping plate.

[0022] 4. The foil winding casting mold provided by the present invention, the second limiting member includes a supporting portion vertically arranged relative to the second limiting portion, and the supporting portion is detachably connected to the lower end surface of the mold body. By adopting the detachable connection between the supporting portion and the lower end surface, it can avoid the problem of inconvenient disassembly and assembly after the foil winding when the second limiting member is fixed on the foil winding surface of the mold body, thus facilitating the disassembly of the second limiting member after the foil winding is completed.

[0023] 5. The foil winding casting mold provided by the present invention, at least one mounting hole is provided on the supporting portion, and the supporting portion is fixed on the mold body through a fixing member passing through the mounting hole. Through this setting, a good fixing effect can be ensured between the supporting portion and the mold body. At the same time, this structure is convenient for disassembly and assembly, with simple operation, which is beneficial to improving the foil winding efficiency.

[0024] 6. The foil winding casting mold provided by the present invention, the second limiting portion is provided with a first mating surface attached to the foil winding surface and a second mating surface with a smooth transition to the foil winding surface on the outside, which can further enhance the fitting effect between the second limiting portion and the foil winding surface, facilitate the transition action of the foil winding, reduce the interference between the foil winding and the second limiting portion. At the same time, this setting is also convenient for removing the supporting portion and withdrawing the second limiting portion after the foil winding is completed.

[0025] 7. The foil winding casting mold provided by the present invention, by making the first abutting surface and the second abutting surface in the same plane, it can further ensure that the connection copper bars are in the same plane, which is beneficial to the clamping operation of the connection copper bars.

[0026] 8. The foil winding casting mold provided by the present invention, a second clamping plate extending downward relative to the supporting portion is provided on the second limiting member, which can provide a clamping basis for an external clamping member to the second limiting member, thus ensuring the fixing effect of the connection copper bars on the second limiting member.

[0027] In addition, the present invention also provides a foil winding casting method, including the following steps:

[0028] Connect the second limiting member to the mold body, place the connection copper bars against the foil winding surface of the mold body and make the connection copper bars respectively abut against the first abutting surface of the first limiting member and the second abutting surface of the second limiting member;

[0029] Perform foil winding operation on the mold body;

[0030] Remove the second limiting member from the mold body, and then cast the foil wound on the mold body;

[0031] Demold the mold body from the upper end.

[0032] By adopting the above-mentioned foil winding and casting method, the stable clamping effect of the welded copper bar during the foil winding process can be ensured. After removing the second limiting member, the mold body is demolded from the upper end, so that there are no other structural members outside the casting range of the mold body that interfere with the casting, which is conducive to the mold and the foil winding being pulled out and demolded, and the foil winding can have a better forming state. Brief Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 The front view of the foil winding and casting mold described in the first embodiment of the present invention;

[0035] Figure 2 The structural schematic diagram of each component on the upper end surface of the mold body described in the first embodiment of the present invention;

[0036] Figure 3 The structural schematic diagram of each component on the upper end surface of the mold body described in the first embodiment of the present invention;

[0037] Figure 4 The structural schematic diagram of the second limiting member described in the first embodiment of the present invention.

[0038] Description of the Reference Numerals in the Drawings:

[0039] 1. Mold body; 2. First limiting portion; 3. Second limiting portion; 4. Supporting portion; 5. First clamping plate; 6. Second clamping plate;

[0040] 101. Foil winding surface; 201. First abutting surface; 301. First mating surface; 302. Second mating surface; 303. Second abutting surface; 401. Mounting hole; 402. Card slot. Detailed Embodiments

[0041] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Embodiment 1

[0046] This embodiment relates to a foil winding casting mold, which includes a mold body 1 and a first limiting member and a second limiting member provided on the mold body 1.

[0047] The first limiting member is provided at the upper end of the mold body 1 and has a first limiting portion 2 extending axially along the mold body 1 to the outside of the foil winding surface 101. The first limiting portion 2 has a first abutting surface 201 for abutting against the wiring copper bar, and the height of the extending end of the first limiting portion 2 is higher than the highest liquid level for casting the foil wound on the foil winding surface 101.

[0048] The second limiting member is detachably connected to the lower end of the mold body 1 and has a second limiting portion 3 extending axially along the mold body 1 to the outside of the foil winding surface 101. The second limiting portion 3 has a second abutting surface 303 for abutting against the wiring copper bar.

[0049] Based on the above overall structural design, a specific implementation manner of the foil winding casting mold described in this embodiment is as Figure 1 shown. The mold body 1 can adopt an existing mature mold structure, which is generally columnar. The copper foil to be foil-wound is wound around the mold body 1. After the casting operation is completed, the mold body 1 is withdrawn to obtain the cast foil winding. Here, copper foil is used as an example in the following text of this embodiment, and the shape of the mold body 1 is not specifically limited.

[0050] Combined with Figure 1 and Figure 2 it can be known that in this embodiment, the first limiting portion 2 is preferably made of round steel or square steel. Its extending end direction on the mold body 1 is parallel to the axial direction of the mold body 1, and it has a flat first abutting surface 201. The first abutting surface 201 is arranged towards the direction of the wiring copper row and limits the movement trend of the wiring copper row, so as to ensure the limiting and blocking effects on the wiring copper row. Here, materials such as round steel or square steel are used, and the required dimensions are small. Scrap materials can be recycled and used for production, which is convenient for local material selection and has low costs. Of course, hexagonal steel or high-strength steel pipes can also be used. Only examples are given in this embodiment.

[0051] It should be noted that the height of the first limiting portion 2 is higher than the highest liquid level for casting the foil wound on the foil winding surface 101, which means that the lowest end of the first limiting portion 2 is higher than the highest end of the casting liquid level. Through this setting, during the casting operation, the first limiting portion 2 does not contact the casting liquid level, so that the first limiting portion 2 does not interfere with the casting surface and ensures the complete state of the foil winding casting.

[0052] A first clamping plate 5 is also fixedly provided on the upper end surface of the aforementioned mold body 1. The first clamping plate 5 is used to jointly clamp and fix the wiring copper row with an external clamping member. Here, in order to further ensure the fixing effect of the wiring copper row, the first clamping plate 5 is arranged close to the first limiting portion 2. After the first limiting portion 2 limits the wiring copper row, the extended wiring copper row is jointly fixed by the first clamping plate 5 and the external clamping member.

[0053] In this embodiment, as Figure 3 and Figure 4 shown, the second limiting portion 3 is integrally in an arc-shaped plate structure. It fits on the outer surface of the lower end of the mold body 1 and includes a first fitting surface 301 that fits with the foil winding surface 101, and a second fitting surface 302 that is smoothly transitioned to the foil winding surface 101 on the outside. The first fitting surface 301 is matched according to the outer structural shape of the actual used mold body 1, while the second fitting surface 302 matches the arc-shaped structure of the first fitting surface 301 and extends along to the foil winding surface 101.

[0054] It should be noted here that the joint end where the second fitting surface 302 extends along to the foil winding surface 101 should be located at the advancing end in the copper foil winding direction. Through this setting, the fitting effect between the second limiting portion 3 and the foil winding surface 101 can be further enhanced, facilitating the transition action of the foil winding, reducing the interference between the foil winding and the second limiting portion 3. At the same time, the provided first fitting surface 301 and second fitting surface 302 also facilitate removing the second limiting portion 3 after releasing the fixing of the supporting portion 4 on the mold body 1 after the foil winding is completed.

[0055] In addition, the second abutting surface 303 of the second limiting part 3 is arranged on the other side of the second mating surface 302 along the direction of the foil winding surface 101 for the limiting abutting of the wiring copper bar. Preferably, the first grounding interface and the second abutting surface 303 are located on the same plane, so as to facilitate the clamping and limiting of the wiring copper bars at the same side position and ensure that the wiring copper bars at the upper and lower ends are on the same plane, thereby further improving the aesthetics of the foil winding.

[0056] As Figure 4 shown, in this embodiment, the second limiting member further includes a supporting part 4 vertically arranged relative to the second limiting part 3, and the supporting part 4 is detachably connected to the lower end surface of the mold body 1. As a preferred implementation manner, the supporting part 4 and the second limiting part 3 are integrally formed. The perpendicular arrangement of the two is convenient for clamping with the lower end of the mold body 1. The supporting part 4 is arranged in a fitting manner with the lower end surface of the mold body 1, and two spaced installation holes 401 are provided on the supporting part 4. The supporting part 4 is fixed to the mold body 1 through fixing parts passing through the installation holes 401. Here, the fixing parts preferably adopt bolt parts, that is, the supporting part 4 is screwed to the lower end surface of the mold body 1.

[0057] It should be noted that other connection methods such as clamping or embedding can also be adopted between the supporting part 4 and the lower end surface of the mold body 1. This embodiment only gives examples in this regard. Through the above settings, a good fixing effect between the supporting part 4 and the mold body 1 can be ensured. At the same time, the structure is convenient for disassembly and assembly, simple to operate, and is beneficial to improving the casting efficiency.

[0058] Based on the structure with the supporting part 4 provided, the second limiting member in this embodiment further includes a second clamping plate 6 extending downward relative to the supporting part 4. The second clamping plate 6 cooperates with an external clamping member at the lower end of the mold body 1 to clamp and fix the wiring copper bar. The specific structure is as Figure 4 shown. The second clamping plate 6 is vertically arranged downward relative to the limiting part, and its relative extending length should be set according to the clamping effect of the actual external clamping member. A clamping groove 402 for the external clamping member to pass through is also provided on the second clamping plate 6. The shape of the clamping groove 402 is not specifically limited, as long as it can accommodate the external clamping member to extend in and clamp and fix the wiring copper bar.

[0059] By providing the second clamping plate 6, a clamping basis for the external clamping member to the second limiting member can be provided, thereby ensuring the fixing effect of the wiring copper bar on the second limiting member. In addition, the external clamping member described in this embodiment generally refers to a large pliers, and of course, other clamping devices can also be used.

[0060] Embodiment 2

[0061] This embodiment specifically relates to a foil winding casting method, including the following steps:

[0062] Connect the second limiting member to the mold body 1, place the wiring copper busbar against the foil winding surface 101 of the mold body 1, and make the wiring copper busbar abut against the first abutting surface 201 of the first limiting member and the second abutting surface 303 of the second limiting member respectively;

[0063] Perform foil winding operation on the mold body 1;

[0064] Remove the second limiting member from the mold body 1, and then pour the foil wound on the mold body 1;

[0065] Demold the mold body 1 from the upper end.

[0066] In the above-mentioned foil winding operation, use an external clamping member to clamp the first clamping plate 5 and the wiring copper busbar located at the upper end, and use an external clamping member to clamp the second clamping plate 6 and the wiring copper busbar located at the lower end to ensure the overall limiting and fixing effect of the wiring copper busbar.

[0067] When removing the second limiting member from the mold body 1, remove the fixing member screwed on the supporting plate, and then pull out the second limiting member as a whole along the axial direction of the mold body 1 downward.

[0068] By adopting the above-mentioned foil winding and pouring method, the stable clamping effect of the welding copper busbar during the foil winding process can be ensured. After removing the second limiting member, demold the mold body 1 from the upper end, so that there are no other structural members outside the pouring range of the mold body 1 that interfere with the pouring, which is beneficial to the demolding of the mold and the foil winding, and can make the foil winding have a better forming state.

[0069] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A foil-wound casting mold, characterized in that, Comprising: A mold body (1) having a foil winding surface (101) for foil winding; A first limiting member provided at the upper end of the mold body (1), having a first limiting portion (2) extending axially along the mold body (1) to the outside of the foil winding surface (101), the first limiting portion (2) having a first abutting surface (201) for abutting against a connection copper bar, and the height of the extended end of the first limiting portion (2) being higher than the highest liquid level for pouring the foil wound on the foil winding surface (101); A second limiting member detachably connected to the lower end of the mold body (1), having a second limiting portion (3) extending axially along the mold body (1) to the outside of the foil winding surface (101), the second limiting portion (3) having a second abutting surface (303) for abutting against a connection copper bar; the second limiting portion (3) includes a first mating surface (301) arranged in contact with the foil winding surface (101), and a second mating surface (302) with a smooth outer transition to the foil winding surface (101); the combination end of the second mating surface (302) along the foil winding surface (101) is located at the advancing end in the copper foil winding direction.

2. The foil winding casting mold according to claim 1, characterized in that, The first limiting portion (2) is a square steel or a round steel.

3. The foil winding casting mold according to claim 1, characterized in that A first clamping plate (5) is fixedly provided on the upper end surface of the mold body (1), the first clamping plate (5) is used for clamping and fixing the connection copper bar, and the first clamping plate (5) is arranged close to the first limiting portion (2).

4. The foil winding casting mold according to claim 1, wherein, The second limiting member includes a supporting portion (4) vertically arranged relative to the second limiting portion (3), and the supporting portion (4) is detachably connected to the lower end surface of the mold body (1).

5. The foil winding casting mold according to claim 4, wherein At least one mounting hole (401) is provided on the supporting portion (4), and the supporting portion (4) is fixed to the mold body (1) by a fixing member passing through the mounting hole (401).

6. The foil winding casting mold according to claim 1, characterized in that, The first abutting surface (201) and the second abutting surface (303) are in the same plane.

7. The foil winding casting mold according to claim 4, characterized in that, The second limiting member further includes a second clamping plate (6) extending downward relative to the supporting portion (4), and the second clamping plate (6) is used for cooperating with an external clamping member at the lower end of the mold body (1) to clamp and fix the connection copper bar.

8. The foil-winding casting mold according to claim 7, characterized in that, A clamping groove (402) for an external clamping member to pass through is provided on the second clamping plate (6).

9. A foil winding and casting method, characterized in that, Applicable to the foil winding and pouring mold according to any one of the above claims 1-8, including the following steps: Connect the second limiting member to the mold body (1), place the connection copper bar against the foil winding surface (101) of the mold body (1) and make the connection copper bar respectively abut against the first abutting surface (201) of the first limiting member and the second abutting surface (303) of the second limiting member; Perform foil winding operation on the mold body (1); Remove the second limiting member from the mold body (1), and then pour the foil wound on the mold body (1); Demold the mold body (1) from the upper end.

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