CN112863832B - Electromagnetic coil for electromagnetic valve and manufacturing process - Google Patents
Electromagnetic coil for electromagnetic valve and manufacturing process Download PDFInfo
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- CN112863832B CN112863832B CN202110092013.6A CN202110092013A CN112863832B CN 112863832 B CN112863832 B CN 112863832B CN 202110092013 A CN202110092013 A CN 202110092013A CN 112863832 B CN112863832 B CN 112863832B
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- rubber
- solenoid
- coil
- bottom plate
- end plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Electromagnets (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The application relates to a solenoid coil for a solenoid valve and a manufacturing process, the solenoid coil comprises a coil sleeve, wherein a rubber bottom plate is fixedly arranged at one end of the coil sleeve, a plurality of mounting holes are formed in the rubber bottom plate, a rubber tube is fixedly arranged in the coil sleeve, a solenoid is prefabricated in the rubber tube, an end plate is fixedly arranged at one end, close to the rubber bottom plate, of the coil sleeve, a pouring hole is formed in the end plate, and the aperture of the pouring hole is the same as the inner diameter of the rubber tube. This application has the inside effect of rubber entering rubber tube of avoiding rubber tube and rubber bottom plate molten state when the casting moulding.
Description
Technical Field
The application relates to the field of electromagnetic valves, in particular to an electromagnetic coil for an electromagnetic valve and a manufacturing process.
Background
A solenoid valve is an actuator that regulates fluid by electromagnetic control. The solenoid valve includes a solenoid, a valve body, and an opening and closing member. When the power is on, the electromagnetic coil generates electromagnetic force to lift the opening and closing piece from the valve body, so that the valve is opened; when the power is cut off, the electromagnetic force disappears, and the spring presses the opening and closing piece on the valve body to close the valve.
As shown in fig. 1, the conventional electromagnetic coil includes a coil sleeve 1, a rubber bottom plate 2 is fixedly disposed at one end of the coil sleeve 1, a plurality of mounting holes 21 are disposed on the rubber bottom plate 2, a rubber tube 3 is fixedly disposed in the coil sleeve 1, and a solenoid 4 is embedded in the rubber tube 3. When the electromagnetic valve is used, the iron core is arranged in the rubber tube 3, and under the action of electromagnetic force of the electromagnetic coil, the iron core can float up and down in the rubber tube 3 and drive the opening and closing piece to move in the valve body.
When the electromagnetic coil is manufactured, a coil sleeve is generally placed in a special mold, a solenoid is placed in the coil sleeve, and then molten rubber is poured into the coil sleeve and one end of the coil sleeve to form a rubber tube and a rubber bottom plate.
In view of the above-mentioned related technologies, the inventor believes that when a rubber tube and a rubber bottom plate are cast and molded in the existing electromagnetic coil, molten rubber is likely to enter the rubber tube, and the floating process of an iron core in the rubber tube in the subsequent use process is seriously affected.
Disclosure of Invention
The application provides a solenoid coil for a solenoid valve and a manufacturing process thereof, in order to prevent molten rubber from entering the rubber tube and the rubber bottom plate during casting molding.
In a first aspect, the present application provides an electromagnetic coil for an electromagnetic valve, which adopts the following technical solutions:
the utility model provides an electromagnetic coil for solenoid valve, includes coil sleeve, and coil sleeve's one end is fixed and is provided with the rubber bottom plate, has seted up a plurality of mounting holes on the rubber bottom plate, and coil sleeve internal fixation is provided with the rubber tube, has prefabricated the solenoid in the rubber tube, and coil sleeve is close to the fixed end plate that is provided with of one end of rubber bottom plate, has seted up the sprue gate on the end plate, and the aperture of sprue gate is the same with the internal diameter of rubber tube.
By adopting the technical scheme, the end plate is arranged at one end, close to the rubber bottom plate, of the coil pipe, and can support the poured rubber pipe, and after the pouring hole is formed in the end plate, on one hand, redundant molten rubber can fall from the pouring hole when the rubber pipe is poured, and the redundant rubber in the rubber pipe can be cleaned conveniently; on the other hand can plug up the plug hole when pouring rubber bottom plate, avoids unnecessary molten state's rubber to pass in the plug hole gets into the rubber tube to the rubber of molten state gets into inside the rubber tube when cast moulding has effectively been avoided rubber tube and rubber bottom plate.
Preferably, the coil sleeve is internally provided with a limiting pipe fixedly connected with the end plate, and the outer wall of the limiting pipe is abutted against the inner wall of the rubber pipe.
Through adopting above-mentioned technical scheme, set up spacing pipe in the ring sleeve, be convenient for pour into the rubber injection of molten state into between spacing pipe and the coil sleeve when the rubber tube into a mould, make spacing pipe play spacing and guide effect to the forming process of rubber tube, not only make the pouring process of rubber tube more convenient, also can avoid unnecessary rubber to get into inside the rubber tube.
Preferably, a positioning ring is arranged in the mounting hole and fixedly embedded on the rubber bottom plate.
Through adopting above-mentioned technical scheme, inlay on rubber bottom plate and establish the holding ring, make the holding ring can play the positioning action to the forming process of mounting hole, the rubber of molten condition flows at will and blocks up the mounting hole when avoiding pouring.
Preferably, a plurality of slots are opened to the side of end plate to with the holding ring one-to-one, fixedly on the holding ring being provided with the post of inserting, insert the post and establish in the slot.
Through adopting above-mentioned technical scheme, before the pouring rubber bottom plate, can insert the post of inserting on the holding ring one by one and establish in the slot, play the positioning action to the holding ring, improved the accurate degree of mounting hole position on the rubber bottom plate.
In a second aspect, the present application provides an electromagnetic coil for an electromagnetic valve and a manufacturing process thereof, which adopts the following technical scheme:
a solenoid for a solenoid valve and a manufacturing process thereof, comprising the following steps:
s1, primary pouring: placing the solenoid on the end plate, positioning the solenoid between the coil sleeve and the limiting pipe, and pouring molten rubber between the coil sleeve and the limiting pipe to form a rubber pipe;
s2, secondary pouring: after the rubber tube is formed, a blocking piece is inserted into the pouring hole, and then molten rubber is poured on one side of the end plate, which is far away from the solenoid, so that the rubber bottom plate is formed.
By adopting the technical scheme, when the rubber tube is poured, redundant rubber in a molten state can fall from the pouring hole, so that the redundant rubber is prevented from remaining in the rubber tube; when pouring the rubber bottom plate, fill in the pouring hole with the separation blade, play the isolation and stop the effect between rubber bottom plate and the rubber tube, further avoid unnecessary rubber entering rubber tube when pouring the rubber bottom plate in.
When the electromagnetic coil is manufactured, the rubber tube and the rubber base are respectively poured in a twice pouring mode, the possibility that redundant rubber enters the rubber tube can be reduced, the rubber tube and the rubber base can also be respectively poured by using rubber of different materials and types, so that different manufacturing requirements of the rubber tube and the rubber base are met, the manufacturing process of the electromagnetic coil is more convenient, and the electromagnetic coil has stronger applicability.
Preferably, before the rubber bottom plate is poured, positioning rings are placed at preset positions of the mounting holes.
By adopting the technical scheme, before the rubber bottom plate is poured, the positioning ring is placed at the installation Kong Yushe, so that the position of the installation hole can be positioned, and the phenomenon that the installation hole is blocked due to the flowing of molten rubber can be avoided.
Preferably, when the positioning ring is placed, the inserting column on the positioning ring is inserted into the inserting groove in the side face of the end plate.
Through adopting above-mentioned technical scheme, when placing the holding ring, will insert the post and insert and establish in the slot, realize the positioning action to the holding ring, improved the accurate degree of mounting hole position on the rubber bottom plate.
Preferably, a circle of annular baffle ring is fixedly arranged on the periphery of the baffle plate, the baffle ring is clamped on one side, far away from the solenoid, of the end plate, and the baffle ring is made of a flexible material.
Through adopting above-mentioned technical scheme, after the sprue gate was filled in to the separation blade, make the fender ring be located the end plate and keep away from one side of solenoid, can play the effect of sheltering from to the gap between separation blade and the sprue gate, further avoid when pouring rubber bottom plate unnecessary rubber gets into in the rubber tube.
Preferably, one side of the baffle plate close to the rubber bottom plate is pasted with an isolation film.
Through adopting above-mentioned technical scheme, set up barrier film on the separation blade, can play the isolation to the rubber bottom plate of separation blade and pouring, avoid the separation blade to glue on rubber bottom plate, be convenient for take out the separation blade from the plug hole after the rubber bottom plate pouring finishes.
Preferably, before the rubber tube is poured, the limiting column is plugged into the limiting tube.
Through adopting above-mentioned technical scheme, during the rubber tube pouring, be hollow structure in the spacing pipe, fill in spacing post in spacing pipe, can plug up spacing intraduct, avoid molten state's rubber to flow into spacing intraductal.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the end plate and arranging the pouring hole on the end plate, the rubber in a molten state is effectively prevented from entering the rubber tube when the rubber tube and the rubber bottom plate are molded by pouring;
2. by arranging the limiting pipe, the rubber in a molten state can be conveniently injected between the limiting pipe and the coil sleeve when the rubber pipe is poured, and the redundant rubber can be prevented from entering the rubber pipe;
3. through adopting the mode of twice pouring to pour into a mould rubber tube and rubber base respectively, not only can reduce the possibility that unnecessary rubber gets into in the rubber tube, also can satisfy the different manufacturing requirement of rubber tube and rubber base.
Drawings
FIG. 1 is a schematic diagram of a prior art configuration;
FIG. 2 is a schematic structural diagram of an embodiment of the present application;
FIG. 3 is an exploded schematic view intended to show a solenoid;
fig. 4 is an exploded view intended to show the socket.
Description of reference numerals: 1. a coil bushing; 11. an end plate; 111. a pouring hole; 112. a slot; 12. a limiting pipe; 2. a rubber bottom plate; 21. mounting holes; 22. a positioning ring; 23. inserting a column; 3. a rubber tube; 4. a solenoid; 5. a baffle plate; 51. and (4) a baffle ring.
Detailed Description
The present application is described in further detail below with reference to figures 2-4.
The embodiment of the application discloses a solenoid for a solenoid valve.
Referring to fig. 2 and 3, the electromagnetic coil for the electromagnetic valve includes a coil sleeve 1, a rubber bottom plate 2 is fixedly disposed at one end of the coil sleeve 1, a rubber tube 3 is fixedly disposed in the coil sleeve 1, a solenoid 4 is pre-fabricated in the rubber tube 3, and the rubber tube 3 and the solenoid 4 are coaxially disposed with the coil sleeve 1.
Referring to fig. 3, an end plate 11 is fixedly disposed at one end of the coil sleeve 1 close to the rubber bottom plate 2, and the outer diameter of the end plate 11 is the same as that of the coil sleeve 1 and is integrally formed with the coil sleeve 1. A pouring hole 111 is formed in the center of the end plate 11, and the aperture of the pouring hole 111 is the same as the inner diameter of the rubber tube 3.
When the rubber tube 3 is poured, the end plate 11 is horizontally placed in a pouring mold, the end plate 11 is located at the bottom of the coil sleeve 1, then the solenoid 4 is coaxially placed in the coil sleeve 1, the solenoid 4 is placed on the end plate 11, rubber in a molten state is poured in the coil sleeve 1 at the moment, the rubber is formed into the rubber tube 3, redundant rubber can fall from the pouring hole 111 during pouring, the redundant rubber in the rubber tube 3 is convenient to clean, and the redundant rubber is prevented from entering the rubber tube 3; when the rubber bottom plate 2 is poured, the end plate 11 is horizontally placed in the pouring mold, so that the end plate 11 is positioned at the top of the coil sleeve 1, and the pouring hole 111 is blocked at the moment, thereby preventing the rubber in a molten state from entering the rubber tube 3 through the pouring hole 111.
Referring to fig. 3, a limiting pipe 12 is arranged in the coil sleeve 1, the limiting pipe 12 is coaxial with the coil sleeve 1, the limiting pipe 12 is located inside the rubber tube 3, one end of the limiting pipe 12 is fixedly connected with the end plate 11 and integrally formed with the end plate 11, the inner diameter of the limiting pipe 12 is the same as the diameter of the pouring hole 111, and the outer diameter of the limiting pipe 12 is the same as the inner diameter of the rubber tube 3.
When pouring the rubber tube 3, the spiral tube is sleeved on the limiting tube 12, and then the rubber in a molten state is poured between the limiting tube 12 and the coil sleeve 1, so that the limiting and guiding effects on the forming process of the rubber tube 3 are achieved, and the phenomenon that redundant rubber enters the rubber tube 3 can be further avoided.
Referring to fig. 2 and 4, three mounting holes 21 are uniformly formed in the rubber bottom plate 2 along the circumferential direction of the coil sleeve 1, positioning rings 22 are disposed in the mounting holes 21, and the positioning rings 22 are fixedly embedded in the rubber bottom plate 2. The side of the end plate 11 is provided with three slots 112 along the circumference, the positioning ring 22 is fixedly provided with the inserting posts 23, and the inserting posts 23 are in one-to-one correspondence with the slots 112 and inserted into the slots 112.
When the rubber bottom plate 2 is poured, the inserting columns 23 are inserted into the inserting grooves 112 one by one, the positioning function is achieved on the positioning ring 22, then the rubber in the molten state is poured, at the moment, the positioning ring 22 can achieve the positioning function on the forming process of the installation pipe, and the rubber in the molten state is prevented from blocking the installation hole 21.
The implementation principle of the electromagnetic coil for the electromagnetic valve in the embodiment of the application is as follows: when the rubber tube 3 is poured, the end plate 11 is horizontally placed in a pouring mold, the end plate 11 is located at the bottom of the coil sleeve 1, then the solenoid 4 is coaxially placed in the coil sleeve 1, the spiral tube is sleeved on the limiting tube 12, then molten rubber is poured between the limiting tube 12 and the coil sleeve 1, redundant rubber can fall from the pouring hole 111 during pouring, and redundant rubber is prevented from entering the rubber tube 3; when the rubber bottom plate 2 is poured, the end plate 11 is horizontally placed in the pouring mold, so that the end plate 11 is positioned at the top of the coil sleeve 1, and the pouring hole 111 is blocked at the moment, thereby preventing the rubber in a molten state from entering the rubber tube 3 through the pouring hole 111.
The embodiment of the application also discloses a manufacturing process of the electromagnetic coil for the electromagnetic valve.
A process for manufacturing a solenoid coil for a solenoid valve, comprising the steps of:
s1, primary pouring: referring to fig. 2 and 3, the coil sleeve 1 is placed in a casting mold, the solenoid 4 is placed on the end plate 11, the solenoid 4 is positioned between the coil sleeve 1 and the limiting tube 12, a limiting column is firstly plugged into the limiting tube 12, and the limiting column is abutted against the inner wall of the limiting tube 12; then pouring molten rubber between the coil sleeve 1 and the limiting pipe 12 to form a rubber pipe 3; then the limiting column is taken out from the limiting tube 12, and the redundant rubber flows down from the pouring hole 111 on the end plate 11, so that the redundant rubber is prevented from entering the rubber tube 3 in the process of pouring the rubber tube 3.
S2, secondary pouring: referring to fig. 3, after the rubber tube 3 is molded, the end plate 11 faces upward, the blocking piece 5 is inserted into the pouring hole 111, the diameter of the blocking piece 5 is the same as that of the glue pouring hole, a ring-shaped blocking ring 51 is fixedly arranged on the periphery of the blocking piece 5, the blocking ring 51 is clamped on one side of the end plate 11 away from the solenoid 4, the blocking piece 5 and the blocking ring 51 are both made of flexible materials, and isolation films are adhered to one sides of the blocking piece 5 and the blocking ring 51 close to the rubber bottom plate 2; referring to fig. 4, the inserting posts 23 of the three positioning rings 22 are respectively inserted into the three inserting grooves 112 on the side surface of the end plate 11, so as to position the positioning rings 22, and the center of the positioning rings 22 is formed into a mounting hole 21; referring to fig. 2 and 3, molten rubber is poured on the side of the end plate 11 far away from the solenoid 4 to form a rubber bottom plate 2; after the rubber bottom plate 2 is molded, the baffle 5 is taken out from the pouring hole 111, thereby preventing the excess rubber from entering the rubber tube 3 during the pouring of the rubber bottom plate 2.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (4)
1. The manufacturing process of the electromagnetic coil for the electromagnetic valve is characterized by comprising a coil sleeve (1), wherein one end of the coil sleeve (1) is fixedly provided with a rubber bottom plate (2), the rubber bottom plate (2) is provided with a plurality of mounting holes (21), a rubber pipe (3) is fixedly arranged in the coil sleeve (1), a solenoid (4) is prefabricated in the rubber pipe (3), one end, close to the rubber bottom plate (2), of the coil sleeve (1) is fixedly provided with an end plate (11), the end plate (11) is provided with a pouring hole (111), and the aperture of the pouring hole (111) is the same as the inner diameter of the rubber pipe (3); a limiting pipe (12) fixedly connected with the end plate (11) is arranged in the coil sleeve (1), and the outer wall of the limiting pipe (12) is abutted against the inner wall of the rubber pipe (3); a positioning ring (22) is arranged in the mounting hole (21), and the positioning ring (22) is fixedly embedded on the rubber bottom plate (2); a plurality of slots (112) are formed in the side face of the end plate (11), the side face of the end plate corresponds to the positioning rings (22) one by one, inserting columns (23) are fixedly arranged on the positioning rings (22), and the inserting columns (23) are inserted into the slots (112); the preparation method comprises the following steps of,
s1, primary pouring: placing the solenoid (4) on the end plate (11), positioning the solenoid (4) between the coil sleeve (1) and the limiting pipe (12), and pouring molten rubber between the coil sleeve (1) and the limiting pipe (12) to form a rubber pipe (3);
s2, secondary pouring: after the rubber tube (3) is molded, a baffle plate (5) is plugged into the pouring hole (111), and then molten rubber is poured on one side of the end plate (11) far away from the solenoid (4) to form a rubber bottom plate (2); before the rubber bottom plate (2) is poured, positioning rings (22) are placed at preset positions of the mounting holes (21); when the positioning ring (22) is placed, the inserting column (23) on the positioning ring (22) is inserted into the inserting groove (112) on the side surface of the end plate (11).
2. A process for manufacturing an electromagnetic coil for an electromagnetic valve according to claim 1, wherein a ring-shaped retaining ring (51) is fixedly arranged on the outer periphery of the retaining sheet (5), the retaining ring (51) is clamped on the side of the end plate (11) far away from the solenoid (4), and the retaining ring (51) is made of a flexible material.
3. A process for manufacturing a solenoid coil for a solenoid valve according to claim 1, wherein a separation film is attached to the side of the baffle plate (5) adjacent to the rubber base plate (2).
4. A process for manufacturing a solenoid coil for a solenoid valve according to claim 1, wherein the stopper post (6) is inserted into the stopper tube (12) before the rubber tube (3) is poured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110092013.6A CN112863832B (en) | 2021-01-23 | 2021-01-23 | Electromagnetic coil for electromagnetic valve and manufacturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110092013.6A CN112863832B (en) | 2021-01-23 | 2021-01-23 | Electromagnetic coil for electromagnetic valve and manufacturing process |
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| Publication Number | Publication Date |
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| CN112863832A CN112863832A (en) | 2021-05-28 |
| CN112863832B true CN112863832B (en) | 2023-03-24 |
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| CN202110092013.6A Active CN112863832B (en) | 2021-01-23 | 2021-01-23 | Electromagnetic coil for electromagnetic valve and manufacturing process |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838405A (en) * | 2019-11-28 | 2020-02-25 | 广州中车骏发电气有限公司 | Transformer casting mold and casting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH583963A5 (en) * | 1975-04-03 | 1977-01-14 | Landis & Gyr Ag | Coil cast in synthetic resin - uses plastic drawn cup round coil as casting mould with bottom protrusion |
| CN101930821B (en) * | 2009-06-25 | 2012-11-14 | 浙江三花股份有限公司 | Electromagnetic coil device |
| JP4947503B1 (en) * | 2010-09-22 | 2012-06-06 | 住友電気工業株式会社 | Reactor, converter, and power converter |
| CN104517698B (en) * | 2013-09-30 | 2017-08-25 | 浙江三花智能控制股份有限公司 | A kind of electric expansion valve and its coil device |
| EP2908320B1 (en) * | 2014-02-13 | 2019-04-10 | Power Integrations Switzerland GmbH | Transformer with insulation structure and method of manufacturing a transformer with insulation structure |
| CN105345975B (en) * | 2015-11-15 | 2017-07-14 | 艾柯电器（苏州）有限公司 | One kind cast height adjustable and the caducous epoxy resin cast mould of internal model |
| DE102017201453A1 (en) * | 2017-01-30 | 2018-08-02 | Festo Ag & Co. Kg | Coil assembly, method for its manufacture and valve unit equipped therewith |
| CN207558608U (en) * | 2017-12-07 | 2018-06-29 | 河北惠仁医疗设备科技有限公司 | Electromagnetic coil casting mold |
| DE102018200084B4 (en) * | 2018-01-04 | 2021-09-16 | Vitesco Technologies GmbH | Method for producing an electromagnetic valve arrangement and electromagnetic valve arrangement |
| CN209647538U (en) * | 2019-01-21 | 2019-11-19 | 台州迪邦科技有限公司 | A kind of two end ring casting molds for rotor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110838405A (en) * | 2019-11-28 | 2020-02-25 | 广州中车骏发电气有限公司 | Transformer casting mold and casting method |
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