CN212242031U - Inner and outer basket type formed plastic composite pipe die - Google Patents

Abstract

The utility model relates to an inside and outside basket type formed plastic composite pipe die, which belongs to the technical field of accessories of plastic pipe production lines. The utility model is characterized in that the inner layer basket type filter screen is arranged between the inner layer melt distribution body and the core mold seat, the left end of the inner layer basket type filter screen is provided with a mold head gland, and the mold head gland is provided with an inner layer neck mold; the outer surface of the inner layer basket type filter screen is sleeved with a spacer bush, the left end of the spacer bush is provided with an upper die body, the outer surface of the spacer bush is sleeved with an outer layer basket type filter screen, and the outer layer basket type filter screen is provided with an upper die body, a middle die body and a lower die body. The utility model discloses fuse-element pressure only has 2 ~ 7Mpa in the mould when high-speed operation, can not cause the problem that the material decomposes like inside and outside spiral plastic composite pipe mould natural heating up, still can regard as the special mould of burying ground polyethylene pipe for the production gas simultaneously.

Description

Inner and outer basket type formed plastic composite pipe die

Technical Field

The utility model relates to an inside and outside basket type formed plastic composite pipe die, which belongs to the technical field of accessories of plastic pipe production lines.

Background

In the process of forming and cooling, the internal stress formed by the outer layer and the inner layer of the plastic composite pipe is less than that of a single-layer plastic pipe with the same wall thickness, so most plastic pipe manufacturers are willing to produce the plastic composite pipe. However, the molds for producing plastic composite pipes in China are all of an internal and external spiral structure, the spiral melt channel of the mold with the spiral structure is small in sectional area and long in length, the melt pressure in the mold is high and is generally about 20Mpa, when the production speed is increased, the melt pressure in the mold is further increased, and when the pressure reaches more than 25Mpa, the melt of a composite pipe product is decomposed into waste products; in order to avoid melt decomposition of a composite pipe product, the mold with a spiral structure can only be operated at a low speed for production so as to ensure that the melt pressure in the mold does not exceed 20Mpa, so that the production efficiency is lower and the production efficiency of the mold is less than 55 percent.

In order to solve the above problems, the granted publication number "CN 201471709U" discloses a "basket type outer layer split flow type mold for inner layer of plastic composite pipe", which changes the inner layer into basket type structure to reduce the melt pressure in the mold, but because the outer layer is split flow type structure, only the plastic composite pipe with pipe diameter below 160 mm can be produced, the problem of too high melt pressure in the mold can also exist when producing the plastic composite pipe with pipe diameter above 160 mm, especially when the pipe diameter exceeds 200 mm, the mold with the structure can not be produced.

The existing single-layer filter screen type plastic pipe die can solve the problem of overhigh pressure of a melt in the die, but the filter screen adopts a straight cylinder structure, the filter screen is fixedly assembled by fastening a filter screen cylinder on the die head from bottom to top through a screw rod, and therefore the plastic pipe die can only be used for low-speed production.

Disclosure of Invention

An object of the utility model is to provide an inside and outside filter screen all adopts basket type structure, separate through the spacer between two filter screens, melt pressure only has 2 ~ 7Mpa in the mould during high-speed operation, be fit for producing the compound pipe of medium-and-large-scale plastics more than 250 millimeters, and continuous production melt pressure can not change, melt pressure height causes the fuse-element to decompose in the mould when solving current mould continuous production, mould intraductal internal stress big, and the compound pipe mould of inside and outside basket type that the compound pipe problem of plastics below 160 millimeters can only be produced to the outer shunting mould of inlayer basket type.

The utility model discloses a realize above-mentioned purpose through following technical scheme:

the utility model provides a compound pipe die utensil of fashioned plastics of interior outer basket, it is by well die body, go up die body, lower die body, die head gland, tail mould, outer basket filter screen, spacer, inlayer basket filter screen, core die holder, trombone, inlayer melt flow distribution body, mandrel, bush, outer neck mould and inlayer neck mould constitute, the left end of trombone is equipped with inlayer melt flow distribution body through lock nut, the right-hand member of trombone is equipped with the core die holder, the right side of core die holder is equipped with the mandrel changeover portion admittedly, the cover is equipped with the tail mould on the surface of mandrel changeover portion, the right side of mandrel changeover portion admittedly is equipped with the mandrel, the cover is equipped with the bush on the surface of mandrel, its characterized in that: an inner layer basket type filter screen is arranged between the inner layer melt distribution body and the core mold seat, a die head gland is arranged at the left end of the inner layer basket type filter screen, and an inner layer neck mold is arranged on the die head gland; the outer surface of the inner layer basket type filter screen is sleeved with a spacer bush, the left end of the spacer bush is provided with an upper die body, the outer surface of the spacer bush is sleeved with an outer layer basket type filter screen, and the outer layer basket type filter screen is provided with an upper die body, a middle die body and a lower die body;

the left end flange of the inner layer basket type filter screen is fixed by a die head gland, and the right end of the inner layer basket type filter screen is fixed on a spigot on the outer surface of the core die seat; the left end of the inner ring of the spacer bush is fixed on a spigot on the outer surface of the inner layer basket type filter screen, and a left end flange of the spacer bush is fixed through the upper die body; the left end flange of outer basket strainer passes through the last mould body and the die body is fixed, has 0.2 ~ 0.4 millimeter clearance between the right-hand member torpedo body cone of outer basket strainer and the right-hand member cone of spacer sleeve.

The inner-layer melt distribution body, the core die holder and the inner-layer basket type filter screen form an inner-layer large melt cavity, and the inner-layer basket type filter screen and the spacer bush form an inner-layer small melt cavity; the spacer bush and the outer layer basket type filter screen form an outer layer large melting cavity, and the outer layer basket type filter screen and the middle die body form an outer layer small melting cavity.

The outer layer basket type filter screen is provided with outer filter holes.

The inner layer basket type filter screen is provided with inner filter holes.

An outer-layer pipe wall uniform adjusting plate is arranged between the lower die body and the tail die.

The inner layer melt distribution body and the die head gland, the die head gland and the upper die body, the upper die body and the middle die body and the lower die body are fastened into a whole through screws.

The neck mold is pressed on the tail mold through a neck mold gland.

Compared with the prior art, the utility model beneficial effect lie in:

1. compare with present inside and outside spiral plastic composite pipe mould, the utility model discloses a filtration pore crowd runner on the material adopts the inlayer basket filter screen to extrude, has improved the even plastify nature of material, has strengthened the closely knit degree of tubular product.

2. Compare with present inside and outside spiral plastic composite pipe mould, the utility model discloses a cross-sectional area of filtration pore crowd on the inlayer basket filter screen is big, to the plastic composite pipe of the same diameter, the utility model discloses a cross-sectional area of mould micropore crowd is about twelve times bigger than the cross-sectional area of present spiral composite pipe mould spiral melt way crowd, and the compound pipe mould filtration pore runner of inside and outside basket type is short, only the spiral melts about one tenth of way, therefore the compound pipe mould inlayer of inside and outside basket type fashioned plastic and outer pressure during the use is low, generally not more than 7Mpa, absolutely can not cause the problem that the material decomposes like inside and outside spiral plastic composite pipe mould because of the interior high mould natural temperature rise of pressure, has ensured the tubular product quality.

3. Compared with the existing internal and external screw type plastic composite pipe mold, the internal and external screw type plastic composite pipe mold with the diameter of 250 mm is taken as an example, the daily output of the same main machine and auxiliary machine can only be four tons, and the daily output of the plastic composite pipe mold provided with the internal and external basket type molding can be up to ten tons.

4. The internal and external basket type formed plastic composite pipe die has low melt pressure during production, reduces mechanical abrasion, can ensure that the melt is extruded at a stable plasticizing temperature, has no self-heating phenomenon formed by high pressure of a spiral die, and has small internal stress of the produced pipe; in addition, the plastic composite pipe mold formed by the inner basket type and the outer basket type improves the plasticizing uniformity of materials, and simultaneously improves the fatigue resistance of the pipe, and the special performances achieve two index performances of fast crack propagation resistance and slow crack growth resistance of the pipe.

5. The difficulty of producing the buried polyethylene pipe for fuel gas is very high by using the single-layer spiral plastic pipe die, the single-layer basket type plastic pipe die, the internal and external spiral plastic composite pipe die and the internal basket type external shunting plastic composite pipe die, so that the existing manufacturers capable of producing the buried polyethylene pipe for fuel gas are few. The utility model provides an inside and outside basket fashioned plastic composite pipe mould fuse-element pressure is low, can ensure that the fuse-element is extruded under stable plastify temperature, the high pressure that does not have spiral mould forms from the phenomenon of rising temperature, the tubular product internal stress of production is little, the even plastify performance of material has been improved, the fatigue resistance ability of tubular product has also been promoted simultaneously, the tubular product of production can not only ensure that each item mechanical properties index of buried polyethylene pipe reaches the national standard with the gas, can also ensure that index such as resistant quick crack propagation and resistant slow crack growth surpasses the national standard, can promote a step with the quality of buried polyethylene pipe with the gas, can regard as the special mould of producing buried polyethylene pipe with the gas.

Drawings

Fig. 1 is a schematic sectional view of a plastic composite pipe mold formed by inner and outer basket type molding.

In the figure: 1. the inner die body, the outer die body, the upper die body, the lower die body, the upper die cover, the lower die body, the lower die cover, the upper die cover, the lower die base, the upper die cover, the lower die cover, the upper die base, the lower die cover, the upper die cover, the.

Detailed Description

The plastic composite pipe die formed by the inner basket and the outer basket is composed of a middle die body 1, an upper die body 2, a lower die body 3, a die head gland 4, a tail die 5, an outer basket type filter screen 6, a spacer 7, an inner basket type filter screen 8, a core die seat 9, a pull tube 10, an inner layer melt distribution body 11, a core die 13, a mouth die 14, an outer neck die 17 and an inner neck die 18, wherein the inner layer melt distribution body 11 is installed at the left end of the pull tube 10 through a locking nut 19, the core die seat 9 is installed at the right end of the pull tube 10, a core die transition section 12 is fixedly installed at the right side of the core die seat 9, the tail die 5 is sleeved on the outer surface of the core die transition section 12, the core die 13 is fixedly installed at the right side of the core die transition section 12, the mouth die 14 is sleeved on the outer surface of the core die. An inner layer basket type filter screen 8 is arranged between the inner layer melt distribution body 11 and the core mold seat 9, a die head gland 4 is arranged at the left end of the inner layer basket type filter screen 8, and an inner layer neck mold 18 is arranged on the die head gland 4; the outer surface of the inner layer basket type filter screen 8 is sleeved with a spacer 7, the left end of the spacer 7 is provided with an upper die body 2, the outer surface of the spacer 7 is sleeved with an outer layer basket type filter screen 6, and the outer layer basket type filter screen 6 is provided with the upper die body 2, a middle die body 1 and a lower die body 3. An outer-layer pipe wall uniform adjusting plate 16 is arranged between the lower die body 3 and the tail die 5.

The left end flange of the inner layer basket type filter screen 8 is fixed by the die head gland 4, the right end is fixed on a spigot on the outer surface of the die holder 9, and an inner filter hole 801 is formed in the inner layer basket type filter screen 8; the left end of the inner ring of the spacer bush 7 is fixed on a spigot on the outer surface of the inner layer basket type filter screen 8, and a left end flange of the spacer bush 7 is fixed through the upper die body 2; the left end flange of outer basket strainer 6 passes through the die body 2 and the die body 1 is fixed, has 0.2 ~ 0.4 millimeter clearance between the right-hand member torpedo body cone of outer basket strainer 6 and the right-hand member cone section of spacer 7. The inner-layer melt flow dividing body 11 and the die head gland 4, the die head gland 4 and the upper die body 2, the upper die body 2 and the middle die body 1, and the middle die body 1 and the lower die body 3 are fastened into a whole through the screw rods, and the outer-layer basket type filter screen 6, the spacer 7 and the inner-layer basket type filter screen 8 are fixed and then fastened into a whole structure through the screw rods in a sectional mode, so that the problems of installation and disassembly of the outer-layer basket type filter screen 6, the spacer 7 and the inner-layer basket type filter screen 8 are solved, and the problem that the product quality is unstable due to shaking of the filter screen during high-speed production of the inner-layer and outer-layer basket type filter screen structures is. The outer layer basket type filter screen 6 is provided with outer filter holes 601; the inner-layer melt distribution body 11, the core mold seat 9 and the inner-layer basket type filter screen 8 form an inner-layer large melt cavity 20, and the inner-layer basket type filter screen 8 and the spacer bush 7 form an inner-layer small melt cavity 21; the spacer 7 and the outer layer basket type filter screen 6 form an outer layer large melting cavity 22, and the outer layer basket type filter screen 6 and the middle die body 1 form an outer layer small melting cavity 23.

The working process of the plastic composite pipe die formed by the inner and outer basket type comprises the following steps that an outer material of the plastic composite pipe enters a melting cavity of an upper die body 2 through an outer neck die 17, then is uniformly extruded into an outer large melting cavity 22 through the circumference of a flow blocking stem on an outer basket type filter screen 6, most of the material in the outer large melting cavity 22 is extruded into an outer small melting cavity 23 through an outer filtering hole 601 of the outer basket type filter screen 6, the material is laminated and accumulated when being extruded rightwards through the filter screen laminating effect of the outer filtering hole 601, a flow joint when a pipe body is extruded is eliminated, the material is uniformly plasticized in the outer small melting cavity 23 after passing through the outer filtering hole 601 of the outer basket type filter screen 6, then enters a buffer area in a lower die body 3, the material is plasticized again to eliminate material flowing traces, and finally the material is compressed and extruded into a tail die 5 through a melting channel between an outer pipe wall adjusting plate 16 and the tail end of the outer basket type filter screen 6; in addition, when the outer layer material enters the outer layer small melting cavity 23 through the outer filtering holes 601 of the outer layer basket type filter screen 6, a very small amount of the outer layer material enters the annular gap between the right end torpedo body cone of the outer layer basket type filter screen 6 and the right end cone of the spacer 7 to be extruded to form a thin pipe belt material, the pipe belt material enters the tail die 5 to be clamped between the outer layer material and the inner layer material of the plastic composite pipe to form intermediate layer composite, and then the thin pipe belt material is extruded through the annular melting channel between the neck die 14 and the core die 13 to form a pipe blank.

Meanwhile, the inner layer material enters a melting cavity of a die head gland 4 through an inner layer neck die 18, then is evenly extruded into an inner layer large melting cavity 20 through the circumference of a flow blocking stem of an inner layer melt distribution body 11, then is extruded into an inner layer small melting cavity 21 through an inner filter hole 801 of an inner layer basket type filter screen 8, is evenly plasticized by the flow blocking stem under the inner layer basket type filter screen 8, then enters a buffer area for even plasticization, is extruded and is compounded with the outer layer material and an intermediate pipe belt material, and the plastic composite pipe product is formed.

The plastic composite pipe die formed by the inner and outer basket type not only solves the problems that the melt pressure in the existing die is large, high-speed production cannot be realized, and the production efficiency is low, but also thoroughly eliminates the stripe trace on the inner wall of the plastic composite pipe by respectively arranging a plurality of buffer zones on the inner layer and the outer layer of the melting cavity of the outer layer material and the inner layer material.

The above description is only a preferred embodiment of the present invention, and the above illustration does not limit the essence of the present invention in any form, and any simple modification or variation of the above embodiments based on the technical essence of the present invention and equivalent embodiments which may be changed or modified to equivalent variations by using the technical essence of the present invention by those of ordinary skill in the art after reading the present description still belong to the technical solution of the present invention without departing from the essence and scope of the present invention.

Claims (8)

1. A plastic composite pipe die formed by an inner basket and an outer basket is composed of a middle die body (1), an upper die body (2), a lower die body (3), a die head gland (4), a tail die (5), an outer basket filter screen (6), a spacer bush (7), an inner basket filter screen (8), a core die seat (9), a pull pipe (10), an inner melt distribution body (11), a core die (13), a mouth die (14), an outer neck die (17) and an inner neck die (18), wherein the left end of the pull pipe (10) is provided with the inner melt distribution body (11) through a locking nut (19), the right end of the pull pipe (10) is provided with the core die seat (9), the right side of the core die seat (9) is fixedly provided with a core die transition section (12), the outer surface of the core die transition section (12) is sleeved with the tail die (5), the right side of the transition section (12) is fixedly provided with the core die (13), the outer surface of the core die, the method is characterized in that: an inner layer basket type filter screen (8) is arranged between the inner layer melt distribution body (11) and the core mold seat (9), a die head gland (4) is arranged at the left end of the inner layer basket type filter screen (8), and an inner layer neck mold (18) is arranged on the die head gland (4); the outer surface of the inner layer basket type filter screen (8) is sleeved with a spacer sleeve (7), the left end of the spacer sleeve (7) is provided with an upper die body (2), the outer surface of the spacer sleeve (7) is sleeved with an outer layer basket type filter screen (6), and the outer layer basket type filter screen (6) is provided with the upper die body (2), a middle die body (1) and a lower die body (3).

2. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the left end flange of the inner layer basket type filter screen (8) is fixed by the die head gland (4), and the right end is fixed on the spigot on the outer surface of the die holder (9); the left end of the inner ring of the spacer bush (7) is fixed on a spigot on the outer surface of the inner basket type filter screen (8), and a left end flange of the spacer bush (7) is fixed through the upper die body (2); the left end flange of outer basket strainer (6) passes through die body (2) and well die body (1) is fixed, has 0.2 ~ 0.4 millimeter clearance between the right-hand member torpedo body cone of outer basket strainer (6) and the right-hand member cone of spacer (7).

3. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the inner-layer melt distribution body (11), the core mold seat (9) and the inner-layer basket type filter screen (8) form an inner-layer large melt cavity (20), and the inner-layer basket type filter screen (8) and the spacer bush (7) form an inner-layer small melt cavity (21); the spacer bush (7) and the outer layer basket type filter screen (6) form an outer layer large melting cavity (22), and the outer layer basket type filter screen (6) and the middle mold body (1) form an outer layer small melting cavity (23).

4. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the outer layer basket type filter screen (6) is provided with outer filter holes (601).

5. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the inner layer basket type filter screen (8) is provided with inner filter holes (801).

6. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: an outer-layer pipe wall uniform adjusting plate (16) is arranged between the lower die body (3) and the tail die (5).

7. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the inner-layer melt distribution body (11) and the die head gland (4), the die head gland (4) and the upper die body (2), the upper die body (2) and the middle die body (1) and the lower die body (3) are fastened into a whole through screws.

8. The plastic composite pipe mold for inner and outer basket molding according to claim 1, wherein: the neck ring mold (14) is pressed on the tail mold (5) through a neck ring mold pressing cover (15).

Images