CN210362360U

CN210362360U - Three-layer co-extrusion lengthened mold core convenient to disassemble and capable of improving eccentricity ratio

Info

Publication number: CN210362360U
Application number: CN201920916533.2U
Authority: CN
Inventors: 黄伟立; 王福志; 李金堂; 张润浩; 刘焕新
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-04-21
Anticipated expiration: 2029-06-18

Abstract

The utility model relates to a convenient three-layer of dismantling and improving eccentricity is crowded extension mold core altogether has solved the not enough of prior art, convenient three-layer of dismantling and improving eccentricity is crowded extension mold core altogether wholly is the pipe form, and convenient three-layer of dismantling and improving eccentricity is crowded extension mold core altogether and whole length is 129mm at least, including bearing portion and mold core bottom, bearing portion appearance wholly is the frustum shape, bearing portion's open-top diameter is less than bearing portion's bottom opening diameter, bearing portion's lower extreme with the upper end fixed connection of mold core bottom, the outside of mold core bottom evenly is provided with twelve loading and unloading planes, loading and unloading plane wholly is the rectangle, loading and unloading plane's the higher authority is bellied arc limit upwards, arbitrary adjacent loading and unloading plane all meets, and bearing portion is inside to be divided into bearing footpath district and joining region, the inner wall bearing radius angle of bearing district is 12, the bearing area is communicated with the bottom of the mold core through a connecting area.

Description

Three-layer co-extrusion lengthened mold core convenient to disassemble and capable of improving eccentricity ratio

Technical Field

The utility model belongs to cable preparation field, a convenient three-layer of dismantling and improving the eccentricity is crowded extension mold core altogether.

Background

With the development of the second industrial revolution since the 70 th 19 th century, electric power has been widely used in various fields and industries around the world. Power cables, which are the main carriers of power transmission, are also mass produced and laid in the corners of the earth. One of the most important links in the production of power cables is the production of tower-erecting cross-linking lines. The crosslinked cable is a short name of crosslinked polyethylene insulated cable, and most of the existing high-voltage cables are insulated by crosslinked polyethylene. The cross-linked cable is a cable suitable for the field of power distribution networks and the like, and has incomparable advantages compared with PVC insulated cables. It has simple structure, light weight, high heat resistance, high load capacity, no smelting, high chemical corrosion resistance and high mechanical strength.

The important importance of the crosslinked cable is the extrusion problem of three-layer co-extrusion, and the extrusion molding die is a product shaping device, and is a final hot-pressing action device in the whole plastic extrusion process, and the geometric shape, structural form and size, temperature, pressure and the like of the extrusion molding die directly determine the success or failure of cable processing, so that the design, selection and heat preservation measures of any extrusion molding product die are highly regarded.

The triple-layer co-extrusion technology is a common application technology in cable production operation, can prevent the introduction of external impurities between the main insulating layer and the conductor shield and between the main insulating layer and the insulation shield, and prevent the conductor shield and the main insulating layer from being accidentally damaged in the manufacturing process, so that the inner shield and the outer shield can be tightly combined with the main insulating layer due to the mechanical damage of the semiconductor electrical layer, thereby improving the initial free discharge voltage. In the prior art (see attached figure 1), in the process of mounting and dismounting a mold core of a mold for extruding a conductor shield in three-layer co-extrusion, a mold opening is extremely easy to damage, and the processing cost of the mold is increased; when the cable with the square of more than 800 is produced, the thickness of the shield in the conductor is extruded unevenly, the eccentricity is serious, and a semi-finished product is scrapped and complained by users.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems that in the prior art, in the process of mounting and dismounting, a die core of a die for extruding a conductor shield in three-layer co-extrusion is very easy to cause die orifice damage and increase the processing cost of the die; when producing the cable more than 800 squares, it is inhomogeneous to make the conductor internal shield thickness extrusion, and the eccentricity is serious, leads to the semi-manufactured goods to scrap, suffers the problem of user complaint, the utility model provides a convenient three-layer of dismantling and improving the eccentricity is crowded extension mold core altogether.

In order to solve the technical problem, the utility model discloses the technical scheme who takes does: the three-layer co-extrusion lengthening mold core convenient to disassemble and improve the eccentricity ratio is integrally in a circular tube shape, the integral length of the three-layer co-extrusion lengthening mold core convenient to disassemble and improve the eccentricity ratio is at least 129mm, and the three-layer co-extrusion lengthening mold core comprises a bearing part and a mold core bottom part, the bearing part is in a frustum shape as a whole, the opening diameter of the top end of the bearing part is smaller than the opening diameter of the bottom of the bearing part, the lower end of the bearing part is fixedly connected with the upper end of the bottom of the mold core, twelve loading and unloading planes are uniformly arranged on the outer side of the bottom of the mold core, the loading and unloading plane is rectangular as a whole, the upper edge of the loading and unloading plane is an arc-shaped edge which protrudes upwards, any adjacent loading and unloading planes are connected, the inside of the bearing part is divided into a bearing area and a connecting area, the inner wall of the bearing area has a bearing radius angle of 12 degrees, and the bearing area is communicated with the bottom of the mold core through a connecting area. The utility model discloses a change mainly embodies in three aspect: such as 220kV-2500mm2 cable. 1. Changing the length: the length is changed from the original 60.1mm to 129mm, so that the length of a bearing area is increased, the extrusion thickness of the inner shield is uniform, and the shielding eccentricity is improved; 2. changing the angle: the angle is changed from the original 1 degree to 12 degrees, so that the materials are uniformly plasticized and flow rapidly; 3. and (3) adding a detachable edge: 12 sides are added, the length is 24mm, and the width is 3mm, so that the installation and the disassembly are simple and rapid. Since this kind of novel mold core of trying on, solved the shielding eccentricity problem greatly, reduced mould manufacturing cost.

Preferably, the loading and unloading planes are 12 in total, and each loading and unloading plane has a length of 24mm and a width of 3 mm.

Preferably, the outer wall of the bearing part is provided with at least one annular bulge serving as an equalizing ring, and the equalizing ring is perpendicular to the axis of the three-layer co-extrusion lengthened mold core which is convenient to disassemble and improves the eccentricity ratio.

Preferably, the included angle between the inner wall of the connecting area and the axial line of the three-layer co-extrusion lengthened mold core which is convenient to disassemble and improves the eccentricity ratio is smaller than 12 degrees.

Preferably, the included angle value of the inner wall of the bottom of the mold core and the axis of the three-layer co-extrusion lengthening mold core which is convenient to disassemble and improves the eccentricity is equal to the included angle value of the inner wall of the connecting area and the axis of the three-layer co-extrusion lengthening mold core which is convenient to disassemble and improves the eccentricity.

The utility model discloses a substantive effect is: 1. changing the length: the length is changed from the original 60.1mm to 129mm, so that the length of a bearing area is increased, the extrusion thickness of the inner shield is uniform, and the shielding eccentricity is improved; 2. changing the angle: the angle is changed from the original 1 degree to 12 degrees, so that the materials are uniformly plasticized and flow rapidly; 3. and (3) adding a detachable edge: 12 sides are added, the length is 24mm, and the width is 3mm, so that the installation and the disassembly are simple and rapid. Since this kind of novel mold core of trying on, solved the shielding eccentricity problem greatly, reduced mould manufacturing cost.

Drawings

FIG. 1 is a schematic diagram of a prior art side view configuration;

FIG. 2 is a schematic side view of the present embodiment;

fig. 3 is a schematic front view of the present embodiment.

In the figure, 1, a diameter bearing area, 2, a connecting area, 3 and a mold core bottom.

Detailed Description

The following provides a more detailed description of the present invention, with reference to the accompanying drawings.

Example 1:

the utility model provides a convenient three-layer is crowded extension mold core altogether (attend figure 2 and figure 3) of dismantling and improving the eccentricity ratio, convenient dismantlement is the whole pipe form that is of three-layer is crowded extension mold core altogether of improving the eccentricity ratio, and convenient dismantlement is 129mm at least to the whole length of three-layer is crowded extension mold core altogether of improving the eccentricity ratio, including bearing portion and mold core bottom, bearing portion appearance is whole to be frustum shape, bearing portion's top opening diameter is less than bearing portion's bottom opening diameter, bearing portion's lower extreme with the upper end fixed connection of mold core bottom, the outside of mold core bottom evenly is provided with twelve loading and unloading planes, loading and unloading plane is whole to be the rectangle, loading and unloading plane's the higher authority is bellied arc limit upwards arbitrary adjacent loading and unloading plane all meets, and bearing portion is inside to be divided into bearing portion and joining region, the inner wall bearing radius angle of bearing portion is, the bearing area is communicated with the bottom of the mold core through a connecting area. The total number of the loading and unloading planes is 12, and the length of each loading and unloading plane is 24mm, and the width of each loading and unloading plane is 3 mm. Be provided with at least one annular arch on the outer wall of bearing portion and regard as equalizer ring, equalizer ring with convenient dismantlement is perpendicular with the axle center of the three-layer crowded extension mold core altogether of improving the eccentricity. The included angle between the inner wall of the connecting area and the axial line of the three-layer co-extrusion lengthened mold core which is convenient to disassemble and improves the eccentricity ratio is smaller than 12 degrees. The included angle value of the inner wall of the bottom of the mold core and the axis of the three-layer co-extrusion lengthened mold core which is convenient to disassemble and improves the eccentricity is equal to the included angle value of the inner wall of the connecting area and the axis of the three-layer co-extrusion lengthened mold core which is convenient to disassemble and improves the eccentricity.

The embodiment is mainly changed in three aspects: such as 220kV-2500mm2 cable. 1. Changing the length: the length is changed from the original 60.1mm to 129mm, so that the length of a bearing area is increased, the extrusion thickness of the inner shield is uniform, and the shielding eccentricity is improved; 2. changing the angle: the angle is changed from the original 1 degree to 12 degrees, so that the materials are uniformly plasticized and flow rapidly; 3. and (3) adding a detachable edge: 12 sides are added, the length is 24mm, and the width is 3mm, so that the installation and the disassembly are simple and rapid. Since this kind of novel mold core of trying on, solved the shielding eccentricity problem greatly, reduced mould manufacturing cost.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.

Claims

1. The utility model provides a convenient three-layer is crowded extension mold core altogether of dismantling and improving the eccentricity, a serial communication port, convenient dismantlement and the three-layer of improving the eccentricity is crowded extension mold core altogether wholly is the pipe form, and convenient dismantlement and the whole length of the three-layer of improving the eccentricity is 129mm at least, including bearing portion and mold core bottom, bearing portion appearance wholly is frustum shape, bearing portion's top opening diameter is less than bearing portion's bottom opening diameter, bearing portion's lower extreme with the upper end fixed connection of mold core bottom, the outside of mold core bottom evenly is provided with twelve loading and unloading planes, loading and unloading plane wholly is the rectangle, loading and unloading plane's higher authority is the bellied arc limit that makes progress, arbitrary adjacent loading and unloading plane all meets, and bearing portion inside divide into bearing diameter district and joining region, the inner wall bearing diameter angle of bearing diameter district is 12, the bearing area is communicated with the bottom of the mold core through a connecting area.

2. The three-layer co-extrusion elongated mold core capable of being disassembled conveniently and improving eccentricity as claimed in claim 1, wherein the number of the loading and unloading planes is 12 in total, and each loading and unloading plane has a length of 24mm and a width of 3 mm.

3. The three-layer co-extrusion lengthened mold core convenient to disassemble and improve the eccentricity ratio according to claim 1, wherein at least one annular bulge is arranged on the outer wall of the bearing part and serves as an equalizing ring, and the equalizing ring is perpendicular to the axis of the three-layer co-extrusion lengthened mold core convenient to disassemble and improve the eccentricity ratio.

4. The conveniently detachable triple-layer co-extrusion elongated core with improved eccentricity as claimed in claim 1, 2 or 3, wherein the inner wall of the connecting area forms an angle of less than 12 ° with the axis of the conveniently detachable triple-layer co-extrusion elongated core with improved eccentricity.

5. The three-layer co-extrusion lengthened mold core convenient to disassemble and improve the eccentricity ratio according to claim 4, wherein the included angle value between the inner wall of the bottom of the mold core and the axis of the three-layer co-extrusion lengthened mold core convenient to disassemble and improve the eccentricity ratio is equal to the included angle value between the inner wall of the connecting area and the axis of the three-layer co-extrusion lengthened mold core convenient to disassemble and improve the eccentricity ratio.