CN212242056U

CN212242056U - Low-resistance pipe die

Info

Publication number: CN212242056U
Application number: CN201922337612.0U
Authority: CN
Inventors: 邓添华; 郭伟; 谭建志
Original assignee: LIANSU MUNICIPAL PIPELINE (HEBEI) CO Ltd
Current assignee: LIANSU MUNICIPAL PIPELINE (HEBEI) CO Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-12-29
Anticipated expiration: 2029-12-23

Abstract

The utility model relates to the field of pipe molds, in particular to a low-resistance pipe mold, which comprises a mold plasticizing part and a mold forming part, wherein the mold plasticizing part comprises an outer mold body arranged on a mold base and a four-spiral-groove spiral body, and the spiral body is arranged in the outer mold body; the mold forming part comprises a mold core and an opening mold, the mold core is connected with the spiral body, the opening mold is connected with the outer mold body, and the mold core and the opening mold form a pipe blank channel which is communicated with a discharge hole of the spiral body. The spiral body divides the melt into four parts from one material flow, increases the hydrodynamic force of the melt and reduces the fluid pressure; meanwhile, the spiral body is directly connected with the mold core, the overall length of the mold is reduced, the flow is shortened, the forming speed of the pipe is improved, and the working efficiency is improved.

Description

Low-resistance pipe die

Technical Field

The utility model relates to a tubular product mould field, more specifically relates to a tubular product mould is pressed to low resistance.

Background

The polyolefin pipe mould generally adopts a spiral mould with six spiral grooves, and the mould has a plurality of structures, so that the overall flow of the mould is long, the melt resistance is large, and the requirement of high-speed production of PE-RT pipes is difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the slow problem of tubular product production speed among the above-mentioned prior art, provide a low resistance tubular product mould, reduce the fluid pressure in the mould, shorten the flow, provide the production efficiency of tubular product.

In order to solve the technical problem, the utility model discloses a technical scheme is: a low-resistance pipe die comprises a die plasticizing part and a die forming part, wherein the die plasticizing part comprises an outer die body and a four-spiral-groove spiral body which are arranged on a die holder, and the spiral body is arranged in the outer die body; the mold forming part comprises a mold core and an opening mold, the mold core is connected with the spiral body, the opening mold is connected with the outer mold body, the mold core and the opening mold form a pipe blank channel, and the pipe blank channel is communicated with a discharge hole of the spiral body.

And the melt enters the spiral body from a feeding port of the die holder and then enters a pipe blank channel formed by the die core and the die from a discharging port of the spiral body. And the melt flows along the pipe blank channel and is molded, and finally flows out of a discharge port of the mold molding part for molding. The spiral body divides the melt into four parts from one material flow, increases the hydrodynamic force of the melt and reduces the fluid pressure. The spiral body is directly connected with the mold core, so that the overall length of the mold is reduced, and the flow is shortened.

Preferably, the helix angle of the helix is 25 to 30 degrees; the angle of the helix angle is reduced by 10 percent compared with the helix angle of a common pipe die, the helix angle is reduced, the resistance formed by the melt at the helix body is obviously reduced, and the extrusion can be accelerated in order to further reduce the running resistance of the melt and accelerate the movement speed of the fluid.

Preferably, the degree of the confluence angle of the die is 80 to 85 degrees. The end part of the inlet of the mouth mold and the mold core adopts a closed flow angle with a larger angle than that of a conventional pipe mold, so that the melt is guided and compressed, and sufficient shaping backpressure is formed on the straight shaping part at the tail part of the inlet of the mouth mold and the mold core through the change of a large-angle flow channel, so that the stability of the discharging of the mouth mold and the good glossiness of a product are ensured.

Preferably, the spirochete is provided with a mounting hole and a mounting groove, and the mold core is provided with a mounting shaft matched with the mounting hole and a shoulder abutted against the mounting groove. The mold core is closely connected with the spiral body, so that the melt in the spiral body can quickly and accurately enter the pipe blank channel, the flowing time of the melt is shortened, and the pipe forming speed is accelerated.

Preferably, the die is connected with the outer die body through a pressure plate.

Preferably, a cooling ring is placed at the die core discharge port of the die forming part, and a flowing cooling medium is arranged in the cooling ring; the inner diameter of the cooling ring is larger than the outer diameter of the die core discharge hole. The cooling ring is placed at the die core discharge port through hanging and other suspended placing modes, does not contact with the neck mold, and avoids the heat of the neck mold from influencing the cooling efficiency of the cooling ring. The pipe blank leaving the forming part of the die is large in expansion rate, high in temperature and not prone to being stretched too fast, continuous circulating cooling media are introduced into the cooling ring for further achieving the purpose of high-speed extrusion, and heat is taken away through the contact of the inner surface of the cooling ring and the surface of the pipe blank, so that the surface of the pipe blank is locally cooled, and the forming of the pipe blank is accelerated.

Compared with the prior art, the beneficial effects of the utility model are that: the spiral body divides the melt into four parts from one material flow, increases the hydrodynamic force of the melt and reduces the fluid pressure; meanwhile, the spiral body is directly connected with the mold core, the overall length of the mold is reduced, the flow is shortened, the forming speed of the pipe is improved, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a low-resistance pipe mold of the present invention;

fig. 2 is a schematic structural diagram of the mold core of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

As shown in fig. 1-2, an embodiment of a low-resistance pipe mold includes a mold plasticizing portion and a mold forming portion, the mold plasticizing portion includes an outer mold body 2 disposed on a mold base 1 and a four-spiral-groove spiral body 3, the spiral body 3 is disposed in the outer mold body 2; wherein the helix angle of the spiral body is 27 degrees. By reducing spiral lifting and only four spiral grooves, the flow speed of the melt in the spiral body is increased, the resistance is reduced, and the flowing speed of the melt in the spiral body can be increased. The screw body 3 is also provided with a mounting hole 301 and a mounting groove 302.

The mold forming part comprises a mold core 5 and a neck mold 4, the mold core 5 is provided with a mounting shaft 501 and a shoulder 502, and the mounting shaft 501 and the shoulder 502 are connected with the spiral body 3 through the mounting shaft and the shoulder 502; the neck ring mold 4 is connected with the outer mold body 2 through a pressing plate 6, the mold core 5 and the neck ring mold 4 form a pipe blank channel 7, and the pipe blank channel 7 is communicated with a discharge hole of the spiral body 3. Wherein the degree of the converging angle 8 of the die is 84 degrees. The end part of the inlet of the mouth mold and the mold core (namely the inlet end of the tube blank channel) adopts a flow combining angle 8 with a larger angle than that of a conventional tube mold, so that the flow of the melt is guided and compressed, and sufficient shaping backpressure is formed on straight shaping parts at the tail parts of the inlet of the mouth mold 4 and the mold core 5 through the change of a flow channel with a large angle, thereby ensuring the stability of the discharging of the melt and the good glossiness of the product.

In addition, a cooling ring 9 is arranged at the position, located at the mold core discharge hole 503, of the mold core 5, and a flowing cooling medium is arranged in the cooling ring 9; the inner diameter of the cooling ring 8 is larger than the outer diameter of the mold core discharge opening 503. The cooling ring 9 is placed at the die core discharge hole 503 in a hoisting mode and is not in contact with the neck mold 5, so that the heat of the neck mold 5 is prevented from influencing the cooling efficiency of the cooling ring 8. Leave the pipe of mould shaping portion, its expansion ratio is big, and the temperature is high, should not stretch too fast, for further realizing the purpose of high-speed extrusion, lets in continuous endless coolant in the cooling ring 9, takes away the heat through cooling ring internal surface and pipe surface contact for the pipe surface carries out local cooling, accelerates the pipe embryo shaping.

The working principle of the implementation is as follows: and the melt enters the spiral body from a feeding port of the die holder and then enters a pipe blank channel formed by the die core and the die from a discharging port of the spiral body. And the melt flows along the pipe blank channel and is molded, and finally flows out of a discharge port of the mold molding part for molding. The spiral body divides the melt into four parts from one material flow, increases the hydrodynamic force of the melt and reduces the fluid pressure. The spiral body is directly connected with the mold core, so that the overall length of the mold is reduced, and the flow is shortened.

The beneficial effects of this embodiment: the spiral body divides the melt into four parts from one material flow, increases the hydrodynamic force of the melt and reduces the fluid pressure; meanwhile, the spiral body is directly connected with the mold core, the overall length of the mold is reduced, the flow is shortened, the forming speed of the pipe is improved, and the working efficiency is improved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The low-resistance pipe pressing die comprises a die plasticizing part and a die forming part, wherein the die plasticizing part comprises an outer die body (2) and a spiral body (3) which are arranged on a die holder (1), and the spiral body (3) is arranged in the outer die body (2), and the low-resistance pipe pressing die is characterized in that the spiral body (3) is a spiral body with four spiral grooves; the die forming part comprises a die core (5) and an opening die (4), the die core (5) is connected with the spiral body (3), the opening die (4) is connected with the outer die body (2), the die core (5) and the opening die (4) form a pipe blank channel (7), and the pipe blank channel (7) is communicated with a discharge hole of the spiral body (3).

2. The low resistance pipe mold according to claim 1, wherein the helix angle of the spiral body (3) is 25 to 30 degrees.

3. The low resistance pipe mold according to claim 1, wherein the convergence angle (8) of the die (4) is 80 to 85 degrees.

4. The low resistance pipe mold according to claim 1, wherein the spiral body (3) is provided with a mounting hole (301) and a mounting groove (302), and the mold core (5) is provided with a mounting shaft (501) which is matched with the mounting hole (301) and a shoulder (502) which is abutted with the mounting groove (302).

5. A low resistance pipe mold as claimed in claim 1, wherein said die (4) is connected to said outer mold body (2) through a pressing plate (6).

6. The low-resistance pipe mold according to any one of claims 1-5, wherein a cooling ring (9) is placed at the mold core discharge port (503) of the mold forming part, and a flowing cooling medium is arranged in the cooling ring (9).

7. The low resistance pipe mold according to claim 6, wherein the inner diameter of the cooling ring (9) is larger than the outer diameter of the die core discharge opening (503).