CN110920021A - Eccentricity adjusting method of semi-extrusion pipe type die for cable extrusion molding - Google Patents
Eccentricity adjusting method of semi-extrusion pipe type die for cable extrusion molding Download PDFInfo
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- CN110920021A CN110920021A CN201911296489.0A CN201911296489A CN110920021A CN 110920021 A CN110920021 A CN 110920021A CN 201911296489 A CN201911296489 A CN 201911296489A CN 110920021 A CN110920021 A CN 110920021A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
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- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an eccentricity adjusting method of a semi-extrusion tubular mold for cable extrusion molding, which is characterized in that an insulation eccentricity correction tube is used for adjusting eccentricity of the semi-extrusion tubular extrusion mold, the front end of the insulation eccentricity correction tube is provided with a section of circular ring-shaped tube, and the wall thickness of the circular ring-shaped tube is slightly smaller than the clear distance between a mold core sizing area and a mold sleeve sizing area of the semi-extrusion tubular extrusion mold; the tail end of the insulating eccentric correction pipe is provided with a push-pull hole, and the specific operation steps are as follows: 1) pushing the circular ring-shaped pipe of the insulating eccentric correction pipe into a position between a die core sizing area and a die sleeve sizing area of the semi-extrusion pipe type die; 2) fixing a die sleeve of the semi-extrusion tubular die on an extrusion molding machine head through a fastening tool; 3) and taking out the insulating eccentric correction pipe to finish the eccentricity adjustment of the semi-extrusion pipe type die.
Description
Technical Field
The invention relates to an eccentricity adjusting method, in particular to an eccentricity adjusting method of a semi-extrusion pipe type mould for cable extrusion molding.
Background
For insulated power cables, the thickness of the insulation around their conductors may not be uniform, i.e. the insulation is off-centre, due to the manufacturing process. In the electrified operation cable, the shielding layer on the surface of the conductor insulating layer is the termination point of an electric field, and when the insulating thickness is uniform, the electric field is a coaxial cylinder electric field. The electric field distribution in the insulation of such a cable is uniform, i.e. the electric field strength is equal over a circumference of the same insulation radius. When the insulation thickness is uneven and eccentric, the electric field is no longer a coaxial cylinder electric field, the electric field distribution in the insulation layer is no longer even, the electric field is concentrated to the thinner insulation part, namely, the electric field strength born by the thinner insulation part is higher. It can be seen that insulation eccentricity is very detrimental to the cable and can lead to insulation breakdown when severe.
For cables of voltage class 35kV and below, the national product standards specify that the eccentricity (the difference between the maximum and minimum thickness divided by the maximum thickness) should not be greater than 15%. However, due to the special use occasions, the quality requirement on products is higher and higher, and a situation that a user requires that the insulation eccentricity of the cable is not more than 10% occurs. For medium and high voltage cables, the requirement of eccentricity is easily met in production due to thick insulation, but for low voltage cables, the insulation is thin, and the eccentricity is difficult to control. The eccentricity is hardly adjusted to be within 10% by manpower depending on experience, time and labor are wasted, insulating materials are wasted, and certain economic loss is brought to enterprises.
Disclosure of Invention
The invention aims to provide an eccentricity adjusting method of a semi-extrusion pipe type mould for cable extrusion molding, aiming at the technical difficulties in the prior art.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: the eccentricity adjustment method of the semi-extrusion tubular mold for cable extrusion molding comprises the steps of using an insulating eccentricity correction tube to adjust eccentricity of the semi-extrusion tubular extrusion mold, wherein the front end of the insulating eccentricity correction tube is provided with a section of circular ring-shaped tube, and the wall thickness of the circular ring-shaped tube is slightly smaller than the clear distance between a mold core sizing area and a mold sleeve sizing area of the semi-extrusion tubular extrusion mold; the specific operation steps are as follows:
1) pushing the circular ring-shaped pipe of the insulating eccentric correction pipe into a position between a die core sizing area and a die sleeve sizing area of the semi-extrusion pipe type die;
2) fixing a die sleeve of the semi-extrusion tubular die on an extrusion molding machine head through a fastening tool;
3) and taking out the insulating eccentric correction pipe to finish the eccentricity adjustment of the semi-extrusion pipe type die.
Furthermore, the rest parts of the insulating eccentric correction tube except the circular ring-shaped tube are solid cylinders.
Furthermore, the pipe wall thickness of the circular annular pipe is 0.01-0.03 mm smaller than the clear distance between the die core sizing area and the die sleeve sizing area.
Furthermore, the tail end of the insulating eccentric correction pipe is provided with a push-pull hole.
Furthermore, the push-pull hole is arranged perpendicular to the axis of the insulating eccentric correction pipe.
Further, in the steps 1) and 3), iron nails, metal rods or other rods with higher hardness are inserted into the push-pull holes, and the insulating eccentric correction pipe is pushed into or taken out from a position between a die core sizing area and a die sleeve sizing area of the semi-extrusion pipe type die.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention uses the insulation eccentric correction tube to adjust the eccentricity of the semi-extruding tube type extrusion molding die, and has easy operation and high adjusting speed.
(2) The eccentricity can be controlled within 7 percent, and compared with the traditional process technology for manually adjusting the eccentricity, the eccentricity is reduced by about 30 percent.
(3) The insulating material consumed by eccentric adjustment is reduced, and the production cost is saved.
Drawings
FIG. 1 is a cross-sectional view of an insulation eccentricity correction tube according to the present invention.
FIG. 2 is a schematic sectional view of a half-extruding type extrusion die of the present invention.
In the figure: 1-insulating eccentric correction pipe, 2-push-pull hole, 3-semi-extrusion pipe type plastic extrusion mould core, 4-mould core sizing area, 5-semi-extrusion pipe type plastic extrusion mould sleeve and 6-mould sleeve sizing area.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
A method for adjusting eccentricity of a semi-extruded tube type extrusion molding die by using an insulating eccentric correction tube 1 is characterized in that a section of circular ring-shaped tube is arranged at the front end of the insulating eccentric correction tube 1, a push-pull hole 2 is arranged at the tail end of a solid part of the insulating eccentric correction tube 1, and the push-pull hole 2 is perpendicular to the axis line of the insulating eccentric correction tube. The pipe wall thickness of the circular ring pipe is 0.01-0.03 mm smaller than the distance between the mold core sizing area 4 of the mold core 3 of the semi-extrusion pipe type plastic extrusion mold and the mold sleeve sizing area 6 of the mold sleeve 5 of the semi-extrusion pipe type plastic extrusion mold.
A method for adjusting eccentricity of a semi-extrusion tube type extrusion molding die comprises the following steps:
pushing the insulating eccentric correction pipe 1 into a position between a die core sizing area 4 and a die sleeve sizing area 6 of the semi-extrusion pipe type die through a push-pull hole 2 by using iron nails or similar tools;
fixing a die sleeve 5 of the extrusion molding die on an extrusion molding machine head by using a bolt through a fastening tool;
and (3) taking out the insulating eccentric correction pipe 1 through a push-pull hole 2 by using an iron nail or a similar tool to finish the eccentricity adjustment of the semi-extrusion pipe type mould.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that several modifications and variations can be made without departing from the structure and principle of the invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (6)
1. The eccentricity adjusting method of the semi-extrusion tube type mold for cable extrusion molding is characterized in that eccentricity adjustment is carried out on the semi-extrusion tube type extrusion molding mold through an insulating eccentricity correction tube, a section of circular ring-shaped tube is arranged at the front end of the insulating eccentricity correction tube, and the wall thickness of the circular ring-shaped tube is slightly smaller than the clear distance between a mold core sizing area and a mold sleeve sizing area of the semi-extrusion tube type extrusion molding mold; the specific operation steps are as follows:
1) pushing the circular ring-shaped pipe of the insulating eccentric correction pipe into a position between a die core sizing area and a die sleeve sizing area of the semi-extrusion pipe type die;
2) fixing a die sleeve of the semi-extrusion tubular die on an extrusion molding machine head through a fastening tool;
3) and taking out the insulating eccentric correction pipe to finish the eccentricity adjustment of the semi-extrusion pipe type die.
2. The method of claim 1, wherein the insulating eccentric correction tube is a solid cylinder except for the circular ring tube.
3. The method of claim 1, wherein the thickness of the annular tube is 0.01 to 0.03mm smaller than the clear distance between the core diameter region and the jacket diameter region.
4. The method of claim 1, wherein the insulation eccentricity correction tube has a push-pull hole at its end.
5. The method of claim 4, wherein the push-pull hole is disposed perpendicular to the axis of the insulation displacement correction tube.
6. The method of claim 4, wherein in steps 1) and 3), nails, metal rods or other rods with high hardness are inserted into the push-pull holes, and the insulation eccentricity correction tube is pushed into or taken out from between the core diameter region and the sleeve diameter region of the semi-extruding die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296489.0A CN110920021A (en) | 2019-12-16 | 2019-12-16 | Eccentricity adjusting method of semi-extrusion pipe type die for cable extrusion molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296489.0A CN110920021A (en) | 2019-12-16 | 2019-12-16 | Eccentricity adjusting method of semi-extrusion pipe type die for cable extrusion molding |
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| Publication Number | Publication Date |
|---|---|
| CN110920021A true CN110920021A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911296489.0A Pending CN110920021A (en) | 2019-12-16 | 2019-12-16 | Eccentricity adjusting method of semi-extrusion pipe type die for cable extrusion molding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113334736A (en) * | 2021-06-24 | 2021-09-03 | 焦作铁路电缆有限责任公司 | Eccentric pre-regulator and method for regulating extrusion molding eccentricity |
-
2019
- 2019-12-16 CN CN201911296489.0A patent/CN110920021A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113334736A (en) * | 2021-06-24 | 2021-09-03 | 焦作铁路电缆有限责任公司 | Eccentric pre-regulator and method for regulating extrusion molding eccentricity |
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