Die for eliminating casting pinholes of extra-high voltage power transmission and transformation switch sealing cover product

Abstract

The utility model discloses a die for eliminating casting pinholes of an extra-high voltage power transmission and transformation switch sealing cover product. A circle of bottom die water cooling cavity is formed in the top in a bottom die, the bottom die is provided with two sprues, a steel core water cooling cavity is formed in a steel core cover die, a random water cooling cavity is formed in an upper die, and a circle of cooling seam is formed in the outer side of the upper die and the inner side of a side die. And a spiral copper pipe is mounted in the cooling seam. The bottom die water-cooling cavity, the edge water-cooling cavity, the random water-cooling cavity, the spiral copper pipe and the steel core water-cooling cavity are arranged on the die, the water inlet pipe and the spiral copper pipe are externally connected with the cooling water supply pipe, water absorbing heat is discharged through the water outlet pipe, the upper surface, the riser, the edge and the corner of a casting can be chilled and cooled at the same time, and the casting quality is improved. The cooling uniformity of the casting is ensured, and shrinkage porosity and pinholes of the casting are avoided.

Description

Technical Field

[0001] This utility model relates to the field of casting mold equipment technology, and more specifically, to a mold for eliminating pinholes in the casting of ultra-high voltage power transmission and transformation switch cover products. Background Technology

[0002] The cover of an ultra-high voltage (UHV) power transmission and transformation switch is a key component for ensuring the switch's seal. Switch manufacturers generally require the pinhole level on the sealing surface to be within level two, and some manufacturers even require no pinhole defects. Due to the large thickness of these products in some areas, the slow solidification rate of the casting, and the large area of ​​the sealing region, the methods currently available in the industry to solve the problem of pinholes in thick areas are relatively limited and difficult to fully meet industry requirements.

[0003] Currently, casting molds are mainly cooled by installing water cooling bags on the outside of the mold, but the cooling effect is limited. The molten casting at the corners and edges of the cavity cannot be cooled quickly, which easily leads to casting defects such as bubbles, shrinkage porosity and pinholes. To address this, we propose a mold to eliminate pinholes in the casting of UHV power transmission and transformation switch cover products. Utility Model Content

[0004] The purpose of this utility model is to provide a mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products. The mold consists of a bottom mold, an upper mold, a steel core cover film, and four side molds located on a supporting base plate. A cavity for forming the cover product is formed between the bottom mold, the upper mold, the steel core cover film, and the four side molds. A bottom mold water-cooling cavity is provided at the top of the bottom mold. Two gates are provided on the surface of the bottom mold. A heat insulation layer is provided on the surface of the gates. A steel core water-cooling cavity is provided inside the steel core cover film. A conformal water-cooling cavity is opened inside the upper mold. Water outlet pipes and water inlet pipes are connected to the bottom mold water-cooling cavity, the conformal water-cooling cavity, and the steel core water-cooling cavity. A cooling seam is formed between the outer side of the upper mold and the inner side of the side molds. A spiral copper pipe is installed in the cooling seam.

[0006] Preferably, the surface of the supporting base plate is fixedly mounted with guide rails in a circular array around the bottom mold, and the bottom of the side mold is slidably connected to the corresponding guide rails.

[0007] Preferably, hydraulic cylinders are installed on the outer side of the side mold and the top of the upper mold.

[0008] Preferably, the upper surface of the upper mold has multiple heat dissipation fins fixedly installed according to its shape.

[0009] Preferably, the spiral copper tube is fixedly installed on the outer edge of the upper mold.

[0010] Preferably, the cross-section of the steel core water-cooling cavity is T-shaped.

[0011] Preferably, a sealing groove is formed on the lower surface of the upper mold.

[0012] Preferably, the bottom of the upper mold has an annular groove, the side mold has an L-shaped cross-section, and an annular rib is fixedly installed on the side mold at the position of the annular groove, with the annular rib inserted into the annular groove.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] This invention provides a bottom mold water-cooling cavity, a heat insulation layer, a conformal water-cooling cavity, a spiral copper tube, and a steel core water-cooling cavity on the mold. The inlet pipe and the spiral copper tube are connected to external cooling water supply pipes, and the water that has absorbed heat is discharged through the outlet pipe. This allows for simultaneous rapid cooling of the upper surface, riser, edges, and corners of the casting, ensuring uniform cooling of the casting and preventing bubbles, shrinkage, and pinholes from forming in the casting. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of a mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to this utility model.

[0017] Figure 2 This is a top view of a mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products, according to this utility model.

[0018] In the diagram: 1. Support base plate; 11. Guide rail; 2. Bottom mold; 21. Bottom mold water-cooling cavity; 22. Insulation layer; 23. Gate; 3. Side mold; 31. Cooling seam; 4. Upper mold; 41. Conformal water-cooling cavity; 42. Sealing groove; 43. Heat dissipation fins; 5. Spiral copper tube; 6. Steel core cover mold; 61. Steel core water-cooling cavity; 7. Water outlet pipe; 8. Water inlet pipe; 9. Hydraulic cylinder. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0020] See Figures 1-2As shown, this utility model provides a mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products. The mold consists of a bottom mold 2, an upper mold 4, a steel core cover film 6, and four side molds 3 located on a supporting base plate 1. The bottom mold 2, upper mold 4, steel core cover film 6, and four side molds 3 form a cavity for molding the cover product. The specific combination and connection relationship are existing technologies and will not be described in detail here. The bottom mold 2 has a ring of bottom mold water cooling cavity 21 at the top. The surface is provided with two gates 23, and an annular heat insulation layer 22 is provided outside the gates 23. The steel core cover film 6 is provided with a steel core water cooling cavity 61. The upper mold 4 is provided with a conformal water cooling cavity 41. The bottom mold water cooling cavity 21, the side water cooling cavity 22, the conformal water cooling cavity 41 and the steel core water cooling cavity 61 are all connected to a water outlet pipe 7 and a water inlet pipe 8. The outer side of the upper mold 4 and the inner side of the side mold 3 form a ring of cooling seam 31. A spiral copper pipe 5 is installed in the cooling seam 31.

[0021] In this embodiment, the surface of the supporting base plate 1 is fixedly mounted with guide rails 11 in a ring array around the bottom mold 2, and the bottom of the side mold 3 is slidably connected to the corresponding guide rails 11.

[0022] In this embodiment, hydraulic cylinders 9 are installed on the outer side of the side mold 3 and the top of the upper mold 4 for mold closing operations.

[0023] To further increase the cooling efficiency of the upper mold 4, in this embodiment, multiple heat dissipation fins 43 are fixedly installed on the upper surface of the upper mold 4.

[0024] In this embodiment, the spiral copper tube 5 is fixedly installed on the outer edge of the upper mold 4. The spiral copper tube 5 is used to input and discharge cooling water. It is in direct contact with the upper mold 4 and can effectively cool the outer edge of the casting.

[0025] To increase the cooling contact surface, in this embodiment, the cross-section of the steel core water-cooling cavity 61 is T-shaped.

[0026] In this embodiment, a sealing groove 42 is provided on the lower surface of the upper mold 4. The sealing groove 42 is the sealing surface of the cover. It can be quickly cooled by the conformal water cooling cavity 41 to avoid the generation of bubbles and pinholes, and can be quickly demolded.

[0027] To ensure that the upper mold 4 can be accurately installed at the corresponding position of the side mold 3, in this embodiment, the bottom of the upper mold 4 is provided with an annular groove, the side mold 3 has an L-shaped cross section, and the side mold 3 is fixedly installed with an annular rib at the position of the annular groove, with the annular rib inserted into the annular groove.

[0028] The specific operating steps are as follows: By connecting the inlet pipe 8 and the spiral copper pipe 5 to the external cooling water supply pipe, and discharging the heat-absorbing water through the outlet pipe 7, the upper surface, riser, edge and corner of the casting can be cooled simultaneously to ensure the uniformity of the casting cooling.

[0029] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall all be within the protection scope of the present invention.

Claims

1. A mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products, the mold comprising a bottom mold, an upper mold, a steel core cover film, and four side molds located on a supporting base plate, wherein the bottom mold, upper mold, steel core cover film, and four side molds form a cavity for molding the cover product, characterized in that: The bottom mold has a ring of bottom mold water cooling cavity at the top, and the bottom mold surface has two gates with a heat insulation layer on the gate surface. The steel core cover film has a steel core water cooling cavity inside, and the upper mold has a conformal water cooling cavity inside. The bottom mold water cooling cavity, conformal water cooling cavity and steel core water cooling cavity are all connected to water outlet pipe and water inlet pipe. The outer side of the upper mold and the inner side of the side mold form a ring of cooling seam, and a spiral copper pipe is installed in the cooling seam.

2. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: The support base plate has guide rails fixedly installed in a ring array around the bottom mold, and the bottom of the side mold is slidably connected to the corresponding guide rail.

3. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: Hydraulic cylinders are installed on the outer side of the side mold and the top of the upper mold.

4. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: The upper surface of the upper mold is fixedly fitted with multiple heat dissipation fins.

5. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: The spiral copper tube is fixedly installed on the outer edge of the upper mold.

6. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: The cross-section of the steel-core water-cooled cavity is T-shaped.

7. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: A sealing groove is provided on the lower surface of the upper mold.

8. The mold for eliminating pinholes in the casting of UHV power transmission and transformation switch cover products according to claim 1, characterized in that: The bottom of the upper mold has an annular groove, and the side mold has an L-shaped cross-section. The side mold is fixedly installed with an annular rib at the position of the annular groove, and the annular rib is inserted into the annular groove.

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