CN109291394A - PE pipe three-layer co-extrusion screw die and its feed distribution method - Google Patents

Abstract

The invention discloses a kind of three-layer co-extruded spiral mould of PE tubing and its charging distribution methods, the three-layer co-extruded spiral mould of PE tubing includes feed zone, outer wall runner, middle layer runner and inner wall runner, the feed zone has outer feed inlet, middle charging aperture and interior feed inlet, the outer wall runner is connected with the outer feed inlet, middle layer runner is connected with the middle charging aperture, and inner wall runner is connected with the interior feed inlet.Outer skin materials and internal layer material of the invention are individually fed, and are made the mobility that material is evenly distributed, offer is more excellent, are improved the quality of PE tubing.

Description

PE pipe three-layer co-extrusion screw die and its feed distribution method

technical field

The invention relates to a three-layer co-extrusion spiral die for PE pipes and a feed distribution method thereof, belonging to the technical field of pipe forming.

Background technique

In the past two decades, domestic PE pipe processing enterprises have developed very rapidly. PE processing enterprises have sprung up like mushrooms after a rain. At the same time, the number of PE extruder manufacturers has gradually increased, forming domestic brand extruders and Foreign brand extruders compete with each other. In this case, various PE pipe processing molds are also born accordingly. PE multi-layer co-extrusion pipe mould is widely used in the fields of water supply, drainage, gas and trenchless. Based on the spiral melt distribution technology, combined with concentric and conical distributors, it is suitable for multi-layer extrusion of any circular cross-section. However, among these many mold manufacturers, due to the unreasonable design of the mold structure and feed, the cross-sectional layering of the pipe made by the customer cannot be distributed according to the proportion specified by the customer, especially some customers use different colors of raw materials to make pipes. Due to the uneven distribution of proportions, it is easy to see the shortcomings of eccentricity and uneven distribution of pipes. Even if the customer keeps adjusting the gap between the die and the mandrel, the uneven distribution of the pipes cannot be changed. As a result, even if the customer disassembles and replaces the mold, the proportion cannot be completely adjusted, especially when it involves the disassembly and assembly of large molds, which is time-consuming, labor-intensive and expensive. .

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the defects of the prior art, and to provide a three-layer co-extrusion screw die for PE pipes. The fluidity improves the quality of the PE pipe.

In order to solve the above technical problems, the technical scheme of the present invention is: a three-layer co-extrusion screw die for PE pipes, which includes a feeding section, an outer wall flow channel, a middle layer flow channel and an inner wall flow channel, and the feeding section has an outer wall flow channel. The feed port, the middle feed port and the inner feed port, the outer wall flow channel is communicated with the outer feed port, the middle layer flow channel is communicated with the middle feed port, and the inner wall flow channel is communicated with the inner feed port. The feed port is connected.

Further, the outer feeding port and the inner feeding port are separated by 180° in the circumferential direction of the feeding section.

Further, it also includes a spiral section and a discharging section, and the feeding section, the spiral section and the discharging section are connected in sequence; wherein,

The spiral section is sequentially provided with an inner layer spiral body, a middle layer spiral body and an outer layer spiral body along its radial direction, the inner layer spiral body is communicated with the inner feeding port, and the middle layer spiral body is communicated with the middle feeding port. , the outer layer spiral body is communicated with the outer feed port;

The discharge section is provided with a discharge flow channel for merging the materials of the inner layer spiral body, the middle layer spiral body and the outer layer spiral body.

Further, the feeding section is provided with an outer arc-shaped groove, an inner arc-shaped groove, two outer through holes and two inner through holes, the outer feeding port is communicated with the middle part of the outer arc-shaped groove, and the outer arc The two ends of the groove are communicated with the outer spiral body through an outer through hole, the inner feed port is communicated with the middle part of the inner arc groove, and the two ends of the inner arc groove are connected with the outer spiral body. Each is communicated with the inner layer spiral body through an inner through hole.

Further, the inner spiral body and the outer spiral body each have eight sets of spiral flow channel groups and two three-stage spiral body grooves, each group of spiral flow channel groups includes two adjacent spiral flow channels, each outer through hole and each spiral flow channel. Each of the inner through holes is respectively connected with the corresponding four sets of helical flow channel groups through a tertiary helical groove, and each tertiary helical groove has a first helical groove, two second helical grooves and four third helical grooves, The first spiral body groove is communicated with the inner through hole or the outer through hole, and is communicated with two second spiral body grooves respectively, and each second spiral body groove is communicated with two third spiral body grooves respectively, and each third spiral body groove is communicated with two third spiral body grooves respectively. The helical body grooves are respectively connected with two helical flow passages in a set of helical flow passages, so that each helical flow passage has a material in circulation.

Further, the spiral section is provided with an outlet for converging and compressing the materials of the inner layer spiral body, the middle layer spiral body and the outer layer spiral body, and the material outlet flow channel is communicated with the outlet.

Further, the discharge section includes a release section, an adjustment co-extrusion ring and a die that are connected in sequence, a mandrel is arranged in the die, and a tail section of the discharge channel is formed between the mandrel and the die, and the The regulating co-extrusion ring is provided with a marker line flow channel that communicates with the outlet flow channel.

The invention also provides a feed distribution method for a PE pipe three-layer co-extrusion screw die, wherein the outer layer material is fed through the outer wall flow channel, and enters the feeding section through the outer feeding port, and the middle layer material flows through the middle layer. The material is fed through the channel and enters the feeding section through the middle feeding port. The inner layer material is fed through the inner wall flow channel and enters the feeding section through the inner feeding port.

Further, the outer layer material from the outer feeding port enters the outer arc groove, and is divided into two outer layers. The outer layer material of each channel enters the outer layer spiral body through the outer through hole, and the inner layer material exiting the inner feeding port enters the outer layer. The inner arc groove is divided into two inner layers, and each inner layer material enters the inner layer spiral body through the inner through hole;

The outer layer material entering the outer spiral body of each channel enters the eight spiral flow channels of the outer spiral body through the three-stage spiral body groove for spiral distribution, and the inner layer material entering the inner layer spiral body of each channel enters the eight spiral flow channels of the inner layer spiral body through the three-stage spiral body groove. A spiral flow channel is used for spiral distribution, and the middle layer material from the middle feed port enters the middle layer spiral body for spiral distribution;

The outer layer material distributed by the outer spiral body, the middle layer material distributed by the middle layer spiral body, and the inner layer material distributed by the inner layer spiral body converge and compress at the outlet of the spiral section to form a PE pipe;

The PE pipe is extruded along the discharge flow channel, and in the extrusion process, it sequentially passes through the release section, the adjustment co-extrusion ring and the tail section of the discharge flow channel formed by the die and the mandrel;

Among them, when the PE pipe is adjusted through the co-extrusion ring, the color-coded material is fed through the marking line flow channel, and the marking line is processed on the PE pipe through the adjusted co-extrusion ring.

After adopting the above technical scheme, the outer layer material and inner layer material of the PE pipe three-layer co-extrusion screw die of the present invention are separately fed, so that the material is distributed evenly, provides better fluidity, and improves the quality of the PE pipe. ; The outer layer material or inner layer material enters the spiral section in two ways. When each outer layer material or inner layer material passes through the three-stage spiral body, it is first divided into two parts by the first spiral body groove, then divided into four parts by the second spiral body groove, and then The third spiral groove is divided into eight quarters and divided into eight outer or inner layers of material. The outer material or inner layer of each channel enters a spiral flow channel, so that each spiral flow channel has materials in circulation. The present invention The spiral flow channel has no dead angle, so that the pressure loss is low, the melt temperature is low, the color material can be cleaned quickly, and the quality of the PE pipe is further guaranteed; Distribution, the middle layer material out of the middle layer flow channel enters the middle layer spiral body for spiral distribution, the inner layer material out of the inner wall channel enters the inner layer spiral body for spiral distribution, which is conducive to the plasticization of the material; the outer layer material after distribution by the outer layer spiral body, The middle-layer material distributed by the middle-layer spiral body and the inner-layer material distributed by the inner-layer spiral body are merged and compressed at the outlet of the spiral section to form a PE pipe; the PE pipe is extruded along the outlet channel, and released in turn during the extrusion section, adjust the co-extrusion ring and the tail section of the outlet channel formed by the die and the mandrel, using the PE pipe three-layer co-extrusion spiral die and the feed distribution method of the present invention, the compressive strength of the produced PE pipe The rigidity of the and ring is greatly improved, the material supply of each layer is uniform, and the wall thickness is consistent, which improves the quality of the pipe. At the same time, the middle layer can use PE recycled material, which reduces the production cost.

Description of drawings

Fig. 1 is the structural representation of the PE pipe three-layer co-extrusion spiral die of the present invention;

Fig. 2 is the top view of the feed section of the present invention;

Fig. 3 is the bottom view of the feed section of the present invention;

FIG. 4 is a schematic structural diagram of the outer helix or the inner helix of the present invention.

Detailed ways

In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1 to 4, a three-layer co-extrusion screw die for PE pipes includes a feed section 1, an outer wall flow channel 21, a middle layer flow channel 22 and an inner wall flow channel 23. The feed section 1 has an outer wall flow channel 23. The feeding port, the middle feeding port and the inner feeding port, the outer wall flow channel 21 is communicated with the outer feeding port, the middle layer flow channel 22 is communicated with the middle feeding port, and the inner wall flow channel 23 is connected with the outer feeding port. The inner feed ports are communicated. In this embodiment, the rear end of the middle-layer flow channel 22 is provided with a dividing fluid 10 for distributing the material of the middle-layer flow channel 22 .

As shown in FIG. 1 , the outer feeding port and the inner feeding port are 180° apart in the circumferential direction of the feeding section 1 . In this embodiment, both the outer feeding port and the inner feeding port are arranged on the side wall of the feeding section 1 .

As shown in Figure 1, the PE pipe three-layer co-extrusion screw die also includes a screw section 3 and a discharge section, and the feed section 1, the screw section 3 and the discharge section are connected in sequence; wherein,

The spiral section 3 is sequentially provided with an inner layer spiral body 31, a middle layer spiral body 32 and an outer layer spiral body 33 along its radial direction. The middle feeding port is communicated, and the outer layer spiral body 33 is communicated with the outer feeding port;

The discharge section is provided with a discharge flow channel 4 for converging the materials of the inner layer helix 31 , the middle layer helix 32 and the outer layer helix 33 .

As shown in Figures 1, 2 and 3, the feeding section 1 is provided with an outer arc-shaped groove 11, an inner arc-shaped groove 12, two outer through holes 13 and two inner through holes 14. It communicates with the middle part of the outer arc-shaped groove 11, and the two ends of the outer arc-shaped groove 11 communicate with the outer spiral body 33 through an outer through hole 13. The middle part of the groove 12 is communicated with each other, and the two ends of the inner arc groove 12 are communicated with the inner layer spiral body 31 through an inner through hole 14 respectively.

As shown in FIGS. 1 and 4 , the inner helical body 31 and the outer helical body 33 each have eight sets of helical flow channel groups and two three-stage helical body grooves, and each set of helical flow channel groups includes two adjacent spiral flow channels , each outer through hole 13 and each inner through hole 14 are respectively communicated with the corresponding four groups of helical flow channel groups through a three-stage helical groove, and each three-stage helical groove has a first helical groove 51, two second helical grooves Two helical grooves 52 and four third helical grooves 53, the first helical grooves 51 communicate with the inner through hole 14 or the outer through hole 13, and are respectively communicated with the two second helical grooves 52, each second The helical body grooves 52 are respectively connected with two third helical body grooves 53, and each third helical body groove 53 is respectively connected with two helical flow passages in a set of helical flow passages, so that each helical flow passage is filled with materials. .

As shown in FIG. 1 , the spiral section 3 is provided with an outlet for converging and compressing the materials of the inner layer spiral body 31 , the middle layer spiral body 32 and the outer layer spiral body 33 , and the material outlet channel 4 communicates with the outlet.

As shown in FIG. 1 , the discharge section includes a release section 6 , an adjustment co-extrusion ring 7 and a die 8 , which are connected in sequence. The die 8 is provided with a mandrel 9 . The tail section of the outflow channel 4 is formed, and the adjustment co-extrusion ring 7 is provided with a marker line channel 71 that communicates with the outflow channel 4 .

Embodiment 2

As shown in Figure 1, a method of feeding and distributing the three-layer co-extrusion screw die for PE pipes, the outer layer material is fed through the outer wall flow channel 21, and enters the feeding section 1 through the outer feeding port, and the middle layer material passes through the middle layer. The flow channel 22 feeds the material and enters the feeding section 1 through the middle feeding port, and the inner layer material is fed through the inner wall flow channel 23 and enters the feeding section 1 through the inner feeding port.

The three-layer co-extrusion spiral die for PE pipes is suitable for the three-layer co-extrusion spiral die for PE pipes described in the first embodiment.

As shown in Figures 1, 2, and 3, the outer layer material from the external feeding port enters the outer arc groove 11, and is divided into two channels of outer layer material. Each channel of outer layer material enters the outer layer spiral body 33 through the outer through hole 13. , the inner layer material from the inner feeding port enters the inner arc groove 12, and is divided into two inner layer materials, each inner layer material enters the inner layer spiral body 31 through the inner through hole 14;

The outer layer material entering the outer layer spiral body 33 enters the eight spiral flow channels of the outer layer spiral body 33 through the three-stage spiral body groove for spiral distribution, and the inner layer material entering the inner layer spiral body 31 enters the inner layer through the three-stage spiral body groove. The eight spiral flow channels of the spiral body 31 carry out spiral distribution, and the middle-layer material from the middle feeding port enters the middle-layer spiral body 32 for spiral distribution;

The outer layer material distributed by the outer layer spiral body 33, the middle layer material distributed by the middle layer spiral body 32 and the inner layer material distributed by the inner layer spiral body 31 converge and compress at the outlet of the spiral section 3 to form a PE pipe;

The PE pipe is extruded along the discharge flow channel 4, and in the extrusion process, it sequentially passes through the release section 6, the adjustment co-extrusion ring 7 and the tail section of the discharge flow channel 4 formed by the die 8 and the mandrel 9;

Among them, when the PE pipe passes through the adjustment co-extrusion ring 7, the color-coded material is fed through the marking line flow channel 71, and the marking line is processed on the PE pipe through the adjustment co-extrusion ring 7. Specifically, when each outer layer material or inner layer material passes through the three-stage spiral body, it is first divided into two parts by the first spiral body groove 51, then divided into four parts by the second spiral body groove 52, and then divided into eight parts by the third spiral body groove 53. It is divided into eight outer layers or inner layers, and each outer layer or inner layer material enters a spiral flow channel.

The working principle of the present invention is as follows:

The outer layer material and inner layer material of the PE pipe three-layer co-extrusion screw die of the present invention adopt a separate feeding method, so that the material is evenly distributed, provides better fluidity, and improves the quality of the PE pipe material; The material enters the spiral section in two ways. When the outer layer material or inner layer material of each channel passes through the three-stage spiral body, it is first divided into two parts by the first spiral body groove 51, then divided into four parts by the second spiral body groove 52, and then divided into four parts by the third spiral body groove. 53 is divided into eight parts, which are divided into eight outer layers or inner layers of materials. The outer layer materials or inner layer materials of each channel enter a spiral flow channel, so that materials circulate in each spiral flow channel. The spiral flow channel of the present invention There is no dead angle, so that the pressure loss is low, the melt temperature is low, the color material can be quickly cleaned, and the quality of the PE pipe is further guaranteed; the outer layer material exiting the outer wall flow channel 21 enters the outer layer spiral body 33 for spiral distribution, The middle layer material exiting the middle layer flow channel 22 enters the middle layer spiral body 32 for spiral distribution, and the inner layer material exiting the inner wall channel 23 enters the inner layer spiral body 31 for spiral distribution, which is conducive to the plasticization of the material; The layer material, the middle layer material distributed by the middle layer spiral body 32 and the inner layer material distributed by the inner layer spiral body 31 converge and compress at the outlet of the spiral section 3 to form a PE pipe; In the process of discharging, through the release section 6, the adjustment co-extrusion ring 7 and the tail section of the discharge flow channel 4 formed by the die 8 and the mandrel 9, the PE pipe three-layer co-extrusion screw die of the present invention and the feeding material are used. With the distribution method, the compressive strength and ring stiffness of the produced PE pipe are greatly improved, the material supply of each layer is uniform, and the wall thickness is consistent, which improves the quality of the pipe. At the same time, the middle layer can use PE recycled material, which reduces the production cost.

The specific embodiments described above further describe in detail the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention, and are not intended to limit the present invention. invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a PE tubular product three-layer is crowded spiral mould altogether which characterized in that: the feeding device comprises a feeding section (1), an outer wall flow channel (21), an intermediate layer flow channel (22) and an inner wall flow channel (23), wherein the feeding section (1) is provided with an outer feeding hole, a middle feeding hole and an inner feeding hole, the outer wall flow channel (21) is communicated with the outer feeding hole, the intermediate layer flow channel (22) is communicated with the middle feeding hole, and the inner wall flow channel (23) is communicated with the inner feeding hole.

2. The three-layer co-extrusion spiral die for the PE pipe material as claimed in claim 1, wherein: the outer feed inlet and the inner feed inlet are 180 degrees apart in the circumferential direction of the feed section (1).

3. The three-layer co-extrusion spiral die for the PE pipe material as claimed in claim 2, wherein: the feeding section (1), the spiral section (3) and the discharging section are sequentially connected; wherein,

the spiral section (3) is sequentially provided with an inner layer spiral body (31), a middle layer spiral body (32) and an outer layer spiral body (33) along the radial direction of the spiral section, the inner layer spiral body (31) is communicated with the inner feeding hole, the middle layer spiral body (32) is communicated with the middle feeding hole, and the outer layer spiral body (33) is communicated with the outer feeding hole;

the discharging section is provided with a discharging flow channel (4) for converging materials of the inner layer spiral body (31), the middle layer spiral body (32) and the outer layer spiral body (33).

4. The three-layer co-extrusion spiral die for the PE pipe material as claimed in claim 3, wherein: the feeding section (1) is provided with an outer arc-shaped groove (11), an inner arc-shaped groove (12), two outer through holes (13) and two inner through holes (14), an outer feeding hole is communicated with the middle part of the outer arc-shaped groove (11), two end parts of the outer arc-shaped groove (11) are communicated with the outer spiral body (33) through one outer through hole (13), the inner feeding hole is communicated with the middle part of the inner arc-shaped groove (12), and two end parts of the inner arc-shaped groove (12) are communicated with the inner spiral body (31) through one inner through hole (14).

5. The triple co-extrusion spiral die for the PE pipe material as claimed in claim 4, wherein: the inner layer spiral body (31) and the outer layer spiral body (33) are respectively provided with eight groups of spiral flow passage groups and two three-level spiral body grooves, each group of spiral flow passage groups comprises two adjacent spiral flow passages, each outer through hole (13) and each inner through hole (14) are respectively communicated with the corresponding four groups of spiral flow passage groups through one three-level spiral body groove, each three-level spiral body groove is provided with a first spiral body groove (51), two second spiral body grooves (52) and four third spiral body grooves (53), the first spiral body groove (51) is communicated with the inner through hole (14) or the outer through hole (13) and is respectively communicated with the two second spiral body grooves (52), each second spiral body groove (52) is respectively communicated with the two third spiral body grooves (53), each third spiral body groove (53) is respectively communicated with the two spiral flow passages in one group of spiral flow passage groups, so that the material flows in each spiral flow passage.

6. The triple co-extrusion spiral die for the PE pipe material as claimed in claim 5, wherein: the spiral section (3) is provided with an outlet for converging and compressing materials of the inner layer spiral body (31), the middle layer spiral body (32) and the outer layer spiral body (33), and the discharging flow channel (4) is communicated with the outlet.

7. The triple co-extrusion spiral die for the PE pipe material as claimed in claim 6, wherein: the discharge section comprises a release section (6), an adjusting co-extrusion ring (7) and an opening die (8) which are sequentially connected, a core rod (9) is arranged in the opening die (8), a tail section of a discharge flow channel (4) is formed between the core rod (9) and the opening die (8), and a mark line flow channel (71) communicated with the discharge flow channel (4) is arranged on the adjusting co-extrusion ring (7).

8. A feeding distribution method of a three-layer co-extrusion spiral die for PE pipes is characterized by comprising the following steps:

the outer layer material is fed through the outer wall runner (21) and enters the feeding section (1) through the outer feeding port, the middle layer material is fed through the middle layer runner (22) and enters the feeding section (1) through the middle feeding port, and the inner layer material is fed through the inner wall runner (23) and enters the feeding section (1) through the inner feeding port.

9. The feeding distribution method of the PE pipe three-layer co-extrusion spiral die as recited in claim 8, wherein:

the PE pipe three-layer co-extrusion spiral mold is suitable for adopting the PE pipe three-layer co-extrusion spiral mold as defined in claim 7.

10. The feeding distribution method of the PE pipe three-layer co-extrusion spiral die as recited in claim 8, wherein the feeding distribution method is characterized in that

In the following steps:

the outer layer material from the outer feed inlet enters the outer arc-shaped groove (11) and is divided into two paths of outer layer materials, each path of outer layer material enters the outer layer spiral body (33) through the outer through hole (13), the inner layer material from the inner feed inlet enters the inner arc-shaped groove (12) and is divided into two paths of inner layer materials, and each path of inner layer material enters the inner layer spiral body (31) through the inner through hole (14);

each path of outer layer material entering the outer layer spiral body (33) enters eight spiral flow passages of the outer layer spiral body (33) through the three-level spiral body groove for spiral distribution, each path of inner layer material entering the inner layer spiral body (31) enters the eight spiral flow passages of the inner layer spiral body (31) through the three-level spiral body groove for spiral distribution, and the middle layer material from the middle feeding hole enters the middle layer spiral body (32) for spiral distribution;

the outer layer material distributed by the outer layer spiral body (33), the middle layer material distributed by the middle layer spiral body (32) and the inner layer material distributed by the inner layer spiral body (31) are converged and compressed at an outlet of the spiral section (3) to form a PE pipe;

the PE pipe is extruded along the discharging flow channel (4), and sequentially passes through the release section (6), the adjusting co-extrusion ring (7) and the tail section of the discharging flow channel (4) formed by the neck ring (8) and the core rod (9) in the extruding process;

when the PE pipe passes through the adjusting co-extrusion ring (7), the color marking material is fed through the marking line flow passage (71), and the marking line is processed on the PE pipe through the adjusting co-extrusion ring (7).