Mutual inductor pouring mold for high-precision requirement of mutual inductor bottom surface insert
By designing a casting mold for transformers and locking inserts with screws and sinker structures, the problem that existing molds are difficult to meet the tolerance requirements of copper inserts is solved, and the effect of high-precision insert installation and reduced production costs is achieved.
Patent Information
- Application Number
- CN202421417631.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-20
AI Technical Summary
After the existing transformer casting mold is installed in copper inserts, it is difficult to meet the planar tolerance requirements of ±0.2mm, resulting in unqualified product size, high scrap rate and high cost.
A transformer casting mold including a base plate, a left vertical plate, a right vertical plate, an upper plate and a screw is designed. Through holes are processed at the upper end of the second sink hole of the upper plate of the mold, and a screw is used to pass through the upper plate. The lower end of the screw is buttted with the first sink hole. The screw is fitted with the insert on the screw, and the lower end of the screw is processed as a stop. The screw and the insert are locked by a nut to ensure the flatness of the insert is consistent.
Through this mold structure, the planar tolerance of the four copper inserts on the bottom surface of the transformer can be effectively ensured that the planarity tolerance of the four copper inserts on the bottom surface is within ±0.2mm, reducing the scrap rate, improving production efficiency, and saving production costs.
Smart Images
Figure CN222681529U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer casting moulds, in particular to a transformer casting special mould which has high-precision requirements on the flatness of an insert installed on the bottom surface of the transformer. Background Art
[0002] For transformers used in some special fields, extremely high requirements are placed on the installation accuracy of the transformers. For some voltage transformers, the flatness of the four copper inserts on the bottom surface must be within ±0.2mm, such as Figure 1 As shown, the existing mold structure is that the left and right vertical plates of the mold have four corresponding guide columns, and the upper plate of the mold also has four corresponding guide columns. When installing the mold, the copper inlay is first installed on the guide columns of the left and right vertical plates of the mold, and then the upper plate of the mold is molded to the left and right vertical plates of the mold along the direction of the guide columns, which is equivalent to clamping the copper inlay in the middle through the guide columns of the left and right vertical plates of the mold and the upper plate of the mold.
[0003] This mold structure has extremely high requirements for mold processing accuracy and the matching accuracy between mold plates, and it is also necessary to ensure the manufacturing accuracy of copper inserts, which makes mold processing difficult and costly. In addition, due to the structural limitations of this mold, the material must be poured on top, which results in the copper inserts having a downward trend during the pouring and molding process due to their own weight and gravity after installation, and the downward amplitudes of the four copper inserts are inconsistent and uncontrollable. Based on the above reasons, the four copper inserts on the bottom of the transformer are exposed 1mm, and the flatness is difficult to ensure within the tolerance requirement of ±0.2mm. This often results in unqualified product dimensions, inability to be repaired, and even serious problems such as scrapping, resulting in certain economic losses. Summary of the invention
[0004] In order to improve at least one defect of the prior art, the utility model provides a transformer casting mold for transformer bottom surface inserts with high precision requirements, which solves the problem that the flatness of the four copper inserts on the bottom surface of the transformer is difficult to meet the tolerance requirements after pouring resin.
[0005] The technical scheme adopted by the utility model is a transformer casting mold for transformer bottom surface inserts with high precision requirements, comprising a bottom plate, a left vertical plate, a right vertical plate, an upper plate and a screw, the left and right sides of the bottom plate are respectively connected to the left vertical plate and the right vertical plate, the upper plate is connected to the upper parts of the left vertical plate and the right vertical plate, a first sinker is processed on the platform surface of the left vertical plate and the right vertical plate respectively, a second sinker is processed at the corresponding position of the upper plate, a through hole is processed at the upper end of the second sinker of the upper plate, the through hole is coaxial with the second sinker, the screw passes through the upper plate, the lower end of the screw is butted with the first sinker, the insert is mounted on the screw, the lower end of the screw is processed into a stopper, the stopper is a cylinder, the lower end of the stopper is processed with a slope, the diameter of the stopper is larger than the inner diameter of the insert and smaller than the inner diameter of the first sinker, the rod body of the screw is a smooth rod, a threaded section is processed on the upper part of the smooth rod, the threaded section of the screw and the nut are threadedly connected to the locking screw and the insert on the upper plate.
[0006] Preferably, the first recess and the second recess are formed at one time by a CNC machining center, the depth of the first recess is 7 mm, the depth of the second recess is 1 mm, and the tolerance is ±0.1 mm. By controlling the machining accuracy of the second recess, the screw locks the insert into the second recess through a nut to ensure fixed connection, thereby ensuring consistent flatness of the four inserts after casting.
[0007] Preferably, the side wall of the baffle is processed with an annular sealing groove for installing a sealing ring, and a sealing connection with the first sink is achieved through the sealing ring, which facilitates demoulding after casting.
[0008] Preferably, the surface of the screw is chrome-plated to increase the structural strength of the screw and make it more durable.
[0009] The beneficial effects of the utility model are as follows: the utility model has a simple structure and is easy to operate, and the tolerance requirements of the flatness of the four copper inserts on the bottom surface of the mutual inductor are ensured; at the same time, the production efficiency is improved, the scrap rate is reduced, and the production cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a schematic diagram of the existing casting mold structure.
[0011] Figure 2 It is a schematic diagram of the pouring mold structure of the utility model.
[0012] Figure 3 Schematic diagram of the screw structure.
[0013] Markings in the figure: 1-insert, 2-left vertical plate, 3-bottom plate, 4-right vertical plate, 5-nut, 6-screw, 7-upper plate, 601-threaded section, 602-stop, 603-sealing groove. DETAILED DESCRIPTION
[0014] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0015] like Figure 2 As shown, a transformer casting mold for transformer bottom surface inserts with high precision requirements includes a bottom plate 3, a left vertical plate 2, a right vertical plate 4, an upper plate 7 and a screw 6. The left and right sides of the bottom plate 3 are respectively connected to the left vertical plate 2 and the right vertical plate 4. The upper plate 7 is connected to the upper part of the left vertical plate 2 and the right vertical plate 4. First recesses are respectively processed on the platform surfaces of the left vertical plate 2 and the right vertical plate 4 according to the corresponding positions of the inserts 1 required by the transformer design. A second recess is processed at the corresponding position of the upper plate 7. The second recess corresponds to the first recess up and down. A through hole is processed at the upper end of the second recess of the upper plate 7. The through hole is coaxial with the second recess. The screw 6 passes through the upper plate 7. The lower end of the screw 6 is connected to the first recess. The insert 1 is mounted on the screw 6. Figure 3 As shown, the lower end of the screw 6 is processed into a stopper 602, which is a cylinder. The lower end of the stopper 602 is processed with a slope for easy insertion. The diameter of the stopper 602 is larger than the inner diameter of the insert 1 for limiting the insert 1. The diameter of the stopper 602 is slightly smaller than the inner diameter of the first sink. The side wall of the stopper 602 is processed with an annular sealing groove 603 for installing a sealing ring, which is used to achieve a sealed connection with the first sink for easy demoulding after casting. The rod body of the screw 6 is a smooth rod, and a threaded section 601 is processed on the upper part of the smooth rod. The threaded section 601 of the screw 6 is threadedly connected with the nut 5 on the upper plate 7 to lock the screw 6 to clamp the insert 1 in place. The surface of the screw 6 is chrome-plated to increase the strength of the screw.
[0016] The first sinker and the second sinker are formed at one time by a CNC machining center. The depth of the first sinker is 7mm, the depth of the second sinker is 1mm, and the tolerance is ±0.1mm. By controlling the machining accuracy of the second sinker, the screw 6 locks the insert 1 into the second sinker through the nut 5 to ensure that the flatness of the four inserts 1 is consistent after casting.
[0017] When installing the mold, first install the four copper inserts 1 on the screw 6 so that the inserts 1 contact the end face of the stopper 602, and then pass the whole through the upper plate 7 of the mold, add a flat gasket on the top surface of the upper plate 7 of the mold and tighten it with a nut 5, which is equivalent to completely clamping and fixing the four inserts 1 between the stopper 602 and the second sink of the upper plate 7 by tightening the nut 5. In addition, the upper plate 7 of the mold is processed by a CNC machining center, which ensures that the processing accuracy of the four second sinks meets the design requirements of the mutual inductor (exposed 1mm). Through the structure of the screw 6 dedicated to this mold and the change of this mold installation method, it is finally ensured that the exposed height of the four copper inserts meets the flatness requirements. Then the upper plate 7, the screw 6, the insert 1 of the mutual inductor and other internal structures are installed together and connected to the mold composed of the bottom plate 3, the left vertical plate 2 and the right vertical plate 4, so that the stopper 602 of the screw 6 is embedded in the first sink to complete the assembly of the mold.
[0018] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A transformer casting mold for transformer bottom surface inserts with high precision requirements, characterized by: The screw rod comprises a bottom plate, a left vertical plate, a right vertical plate, an upper plate and a screw rod, the left and right sides of the bottom plate are respectively connected to the left vertical plate and the right vertical plate, the upper plate is connected to the upper part of the left vertical plate and the right vertical plate, the first sinker is respectively processed on the platform surface of the left vertical plate and the right vertical plate, the second sinker is processed at the corresponding position of the upper plate, a through hole is processed on the upper end of the second sinker of the upper plate, the through hole is coaxial with the second sinker, the screw rod passes through the upper plate, the lower end of the screw rod is butt-jointed with the first sinker, an insert is mounted on the screw rod, the lower end of the screw rod is processed into a stopper, the stopper is a cylinder, the lower end of the stopper is processed with a slope, the diameter of the stopper is larger than the inner diameter of the insert and smaller than the inner diameter of the first sinker, the rod body of the screw rod is a smooth rod, a threaded section is processed on the upper part of the smooth rod, the threaded section of the screw rod and the nut are threadedly connected on the upper plate to lock the screw and the insert.
2. The transformer casting mold for transformer bottom surface inserts with high precision according to claim 1, characterized in that: The first sinker and the second sinker are formed by one-time machining using a CNC machining center. The depth of the first sinker is 7 mm, the depth of the second sinker is 1 mm, and the tolerance is ±0.1 mm.
3. The transformer casting mold for transformer bottom surface inserts with high precision according to claim 1, characterized in that: The side wall of the baffle is processed with an annular sealing groove for installing a sealing ring, and a sealing connection with the first sink is achieved through the sealing ring.
4. The transformer casting mold for transformer bottom surface inserts with high precision according to claim 1, characterized in that: The surface of the screw is chrome-plated.