An extrusion die for preventing crossflow between inner and outer channels

Abstract

The utility model provides an extrusion mould of preventing inner and outer passageway cross flow, include: feed assembly, the extrusion mould body includes the inner spiral body, the outer spiral body is provided with outside the inner spiral body, the right end of inner spiral body and outer spiral body is fixedly connected through the left end of connecting seat with connecting part, the right end part between inner spiral body and connecting part left surface is provided with the sealing ring and prior art compared with annular structure, the utility model has the beneficial effect as follows: through setting up sealing ring between connecting part and inner spiral body, can intercept the material of feed passageway one to multiple feed passageway two series flow, through setting up inner layer glue inlet, outer layer glue inlet, and setting up feed passageway two and dispersed runner, separate the raw material passageway of inner and outer layer, cooperate above-mentioned sealing ring, can ensure that the raw material passageway of inner and outer layer each stable conveying raw material and will not have the problem of cross flow.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion die technology, and specifically relates to an extrusion die that prevents crossflow between internal and external channels. Background Technology

[0002] Existing double-walled corrugated pipe extrusion dies have significant drawbacks in preventing cross-flow between the inner and outer channels. Specifically, during the inner wall material feeding process, it easily seeps into the outer wall material channel through the gap between the outer spiral body and the spiral outer sleeve, thus affecting product quality. This problem stems from assembly errors in the die structure design and the material flow characteristics. During the assembly of the outer spiral body and the spiral outer sleeve, due to manufacturing precision limitations and differences in thermal expansion, minute gaps inevitably form. Since the inner wall material has high fluidity during high-pressure injection, these gaps become the main channels for inner wall material to flow into the outer wall material channel. Conventional solutions to these drawbacks include optimizing the assembly process to reduce gaps, adding seals between the outer spiral body and the spiral outer sleeve, or using special coatings to reduce the adhesion of the inner wall material.

[0003] However, these methods all have certain drawbacks: while optimizing the assembly process can reduce gaps to some extent, it is difficult to completely eliminate them, and it requires extremely high equipment precision, increasing manufacturing costs; adding seals can effectively block crossflow, but the seals are prone to aging and deformation under high temperature and high pressure for a long time, requiring regular replacement, which increases maintenance difficulty and costs; and special coating technology may have unstable effects due to uneven coating thickness or insufficient wear resistance, and its preparation process is complex. Therefore, we hope to design an extrusion die with a novel structure to solve this problem. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an extrusion die that prevents crossflow between the inner and outer channels, thereby solving the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: an extrusion die for preventing crossflow between internal and external channels, comprising: a feeding assembly, the right end of which is fixed to the discharge end of the extruder, and the left end of which is fixed to an extrusion die body for producing double-walled threaded tubes. The feeding assembly includes a connecting seat connected to the extruder, and an inner layer inlet for feeding the inner layer is provided on the upper left side of the connecting seat.

[0006] The extrusion die body includes an inner spiral body, and an outer spiral body is provided on the outside of the inner spiral body. The right ends of the inner spiral body and the outer spiral body are fixedly connected to the left end of the connecting seat through a connecting part. A sealing ring with an annular structure is provided between the right end of the inner spiral body and the left surface of the connecting part. The inner layer inlet extends downward to form a feeding channel one, which is connected to the inner extrusion channel formed between the inner spiral body and the outer spiral body. In actual use, the sealing ring intercepts the material flowing from the feeding channel one to the multiple feeding channels two, effectively avoiding the problem of reduced product quality caused by material crossflow.

[0007] In a preferred embodiment, the feeding assembly further includes an air inlet pipe. The right side of the insertion hole is located inside the lower end of the connector, and the left side extends into the inner spiral body. The insertion hole has an overall L-shaped structure. An air inlet pipe for air intake is inserted inside the insertion hole. In actual use, the insertion hole, in conjunction with the air pipe, can deliver gas into the air chamber, so that when the inner and outer layers of the double-walled corrugated pipe are laminated, the inner layer can better adhere to the outer layer.

[0008] In a preferred embodiment, the right end of the connector is recessed to the left to form an outer glue inlet, and the left side of the outer glue inlet is connected to six feeding channels that are evenly distributed in a ring structure.

[0009] In a preferred embodiment, the lower end of the first feeding channel has an L-shaped structure and extends to the middle of the right end of the inner spiral body. The end axis of the first feeding channel is collinear with the axis of the inner spiral body.

[0010] In a preferred embodiment, the end of the first feeding channel is connected to six uniformly distributed annular flow channels, and its structure is the same as that of the six uniformly distributed annular feeding channels on the left side of the outer glue inlet.

[0011] In a preferred embodiment, the left ends of the six dispersion channels extend to the left and communicate with the right end of the inner extrusion channel. The inner extrusion channel is connected to the feed channel 1 through the six dispersion channels. The feed channel 1 is connected to the external feeding equipment through the inner glue inlet.

[0012] In a preferred embodiment, the extrusion die body further includes an extrusion head and a guide cone. The extrusion head is fixedly connected to the left end of a spiral outer sleeve installed on the outside of the extrusion die body via a flange. The right end of the spiral outer sleeve is fixedly connected to the left end of the connecting part. A guide cone is fixed to the left end of the inner spiral.

[0013] A composite channel is provided between the outer wall of the guide cone and the inner wall of the extruder head. An air chamber is formed through the middle of the guide cone from left to right, and the right end of the air chamber is connected to the air inlet pipe.

[0014] In a preferred embodiment, an external extrusion channel is provided between the outer wall of the outer spiral and the inner wall of the spiral sheath, and the right end of the external extrusion channel is connected to the left end of the six feed channels.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are: 1. By setting a sealing ring between the connecting part and the inner spiral body, the material flowing from the feed channel one to the multiple feed channels two can be intercepted, and conversely, the material flowing from the multiple feed channels two to the feed channel one can also be intercepted, effectively avoiding the problem of reduced product quality caused by material crossflow.

[0016] 2. By setting an inner layer glue inlet and an outer layer glue inlet, and setting a second feeding channel and a dispersion channel, the raw material channels of the inner and outer layers are separated. With the sealing ring mentioned above, it can be ensured that the raw material channels of the inner and outer layers stably transport raw materials without cross-flow problems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an extrusion die for preventing crossflow between internal and external channels according to the present invention.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the connecting seat of an extrusion die for preventing cross-flow between internal and external channels according to the present invention.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the inner inlet and inner spiral of an extrusion die for preventing cross-flow between inner and outer channels according to the present invention.

[0021] In the diagram, 100-feeding assembly, 110-inner layer glue inlet, 111-feeding channel one, 120-connector, 121-outer layer glue inlet, 122-feeding channel two, 130-insertion hole, 140-air inlet pipe;

[0022] 200-Extrusion die body, 210-Extrusion head, 220-Inner spiral, 221-Inner extrusion channel, 230-Outer spiral, 231-Outer extrusion channel, 240-Guide cone, 241-Composite channel, 242-Air chamber. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] As the first embodiment of this utility model:

[0025] Please see Figures 1 to 3 An extrusion die for preventing crossflow between internal and external channels includes: a feeding assembly 100, the right end of which is fixed to the discharge end of the extruder, and the left end of which is fixed to an extrusion die body 200 for producing double-walled threaded tubes. The feeding assembly 100 includes a connecting seat 120 connected to the extruder, and an inner layer inlet 110 for inner layer feeding is provided on the upper left side of the connecting seat 120.

[0026] The extrusion die body 200 includes an inner spiral 220 and an outer spiral 230. The right ends of the inner spiral 220 and the outer spiral 230 are fixedly connected to the left end of the connecting seat 120 through a connecting part. A sealing ring with an annular structure is provided between the right end of the inner spiral 220 and the left surface of the connecting part. The inner inlet 110 extends downward to form a feed channel 111, which is connected to the inner extrusion channel 221 formed between the inner spiral 220 and the outer spiral 230. In actual use, the sealing ring intercepts the material flowing from the feed channel 111 to the multiple feed channels 222, effectively avoiding the problem of reduced product quality caused by material flow.

[0027] Specifically, by setting a sealing ring between the connecting part and the inner spiral body 220, in actual use, since the lower part of the feed channel 111 spans the gap between the connecting part and the inner spiral body 220, and the connection between the six feed channels 222 and the outer extrusion channel 231 also needs to span the gap between the connecting part and the inner spiral body 220, the addition of a sealing ring between the connecting part and the inner spiral body 220 can intercept the material flowing from the feed channel 111 to the multiple feed channels 222, and conversely, it can also intercept the material in the multiple feed channels 222 flowing into the feed channel 111, effectively avoiding the problem of reduced product quality caused by material crossflow.

[0028] As a second embodiment of this utility model:

[0029] Please see Figures 2 to 3The feeding assembly 100 also includes an air inlet pipe 140. The right side of the insertion hole 130 is located inside the lower end of the connector, and its left side extends into the inner spiral body 220. The insertion hole 130 has an overall L-shaped structure. An air inlet pipe 140 for air intake is inserted inside the insertion hole 130. In actual use, the insertion hole 130, in conjunction with the air pipe, can deliver gas into the air chamber 242, so that when the inner and outer layers of the double-wall corrugated pipe are laminated, the inner layer can better fit with the outer layer.

[0030] The right end of the connector 120 is recessed to the left to form an outer glue inlet 121, and the left side of the outer glue inlet 121 is connected to six feeding channels 122 that are evenly distributed in a ring structure.

[0031] The lower end of the feed channel 111 has an L-shaped structure and extends to the middle of the right end of the inner spiral body 220. The axis of the end of the feed channel 111 is collinear with the axis of the inner spiral body 220.

[0032] The end of feed channel 111 is connected to six evenly distributed annular flow channels, and its structure is the same as that of the six evenly distributed annular feed channels 122 on the left side of the outer glue inlet 121.

[0033] The left ends of the six dispersing channels extend to the right end of the inner extrusion channel 221 and are connected thereto. The inner extrusion channel 221 is connected to the feed channel 111 through the six dispersing channels. The feed channel 111 is connected to the external feeding equipment through the inner glue inlet 110.

[0034] The extrusion die body 200 also includes an extrusion head 210 and a guide cone 240. The extrusion head 210 is fixedly connected to the left end of the spiral outer sleeve installed on the outside of the extrusion die body 200 via a flange. The right end of the spiral outer sleeve is fixedly connected to the left end of the connecting part. The guide cone 240 is fixed to the left end of the inner spiral 220.

[0035] A composite channel 241 is provided between the outer wall of the guide cone 240 and the inner wall of the extruder 210. An air chamber 242 is formed by passing through the middle of the guide cone 240 from left to right. The right end of the air chamber 242 is connected to the air inlet pipe 140.

[0036] An external extrusion channel 231 is provided between the outer wall of the outer spiral body 230 and the inner wall of the spiral body jacket. The right end of the external extrusion channel 231 is connected to the left end of the six feed channels 122.

[0037] Based on the first embodiment described above, further, by setting an inner layer inlet 110, an outer layer inlet 121, and a second feeding channel 122 and a dispersion channel, in actual use, the inner layer material during the production of double-wall corrugated pipes, after being heated and melted, enters through the inner layer inlet 110, passes through the first feeding channel 111 and six evenly distributed dispersion channels, and is evenly transported to the inner extrusion channel 221 between the inner spiral body 220 and the outer spiral body 230. Meanwhile, the outer layer material, after being heated and melted... The material enters through the outer inlet 121 and passes through six evenly distributed feed channels 122, which uniformly transport the outer material to the outer extrusion channel 231 between the outer spiral body 230 and the outer sleeve of the spiral body. Then, the inner and outer layers begin to combine at the left end of the outer spiral body 230 and then enter the extrusion head 210 through the guide cone 240 and the compounding channel 241, separating the material channels of the inner and outer layers. With the aforementioned sealing ring, it can be ensured that the material channels of the inner and outer layers stably transport the material without cross-flow.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An extrusion die for preventing crossflow between internal and external channels, comprising: The feeding assembly (100) is fixed at the right end of the extruder discharge end. The feeding assembly (100) is characterized in that the left end of the feeding assembly (100) is fixed with an extrusion die body (200) for extruding double-walled threaded pipe. The feeding assembly (100) includes a connecting seat (120) connected to the extruder. An inner layer inlet (110) for inner layer feeding is provided on the upper left side of the connecting seat (120). The extrusion die body (200) includes an inner spiral (220), and an outer spiral (230) is provided on the outside of the inner spiral (220). The right ends of the inner spiral (220) and the outer spiral (230) are fixedly connected to the left end of the connecting seat (120) through a connecting part. A sealing ring with an annular structure is provided between the right end of the inner spiral (220) and the left surface of the connecting part. The inner layer inlet (110) extends downward to form a feeding channel (111) which communicates with the inner extrusion channel (221) formed between the inner spiral (220) and the outer spiral (230).

2. The extrusion die for preventing crossflow between internal and external channels as described in claim 1, characterized in that: The feeding assembly (100) also includes an air inlet pipe (140). The lower end of the connector is provided with the right side of the insertion hole (130), and the left side of the insertion hole (130) extends into the inner spiral body (220). The insertion hole (130) is generally L-shaped, and the air inlet pipe (140) for air intake is inserted into the insertion hole (130).

3. The extrusion die for preventing crossflow between internal and external channels as described in claim 1, characterized in that: The right end of the connector (120) is recessed to the left to form an outer glue inlet (121), and the left side of the outer glue inlet (121) is connected to six feeding channels (122) that are evenly distributed in a ring structure.

4. The extrusion die for preventing crossflow between internal and external channels as described in claim 3, characterized in that: The lower end of the feed channel (111) is L-shaped and extends to the middle of the right end of the inner spiral (220). The end axis of the feed channel (111) is collinear with the axis of the inner spiral (220).

5. An extrusion die for preventing crossflow between internal and external channels as described in claim 4, characterized in that: The end of the first feeding channel (111) is connected to six uniformly distributed annular flow channels, and its structure is the same as that of the six uniformly distributed annular feeding channels (122) on the left side of the outer glue inlet (121).

6. An extrusion die for preventing crossflow between internal and external channels as described in claim 5, characterized in that: The left ends of the six dispersion channels extend to the right end of the inner extrusion channel (221) and communicate with it. The inner extrusion channel (221) is connected to the feed channel (111) through the six dispersion channels. The feed channel (111) is connected to the external feeding equipment through the inner glue inlet (110).

7. An extrusion die for preventing crossflow between internal and external channels as described in claim 1, characterized in that: The extrusion die body (200) also includes an extrusion head (210) and a guide cone (240). The extrusion head (210) is fixedly connected to the left end of the spiral outer sleeve installed on the outside of the extrusion die body (200) via a flange. The right end of the spiral outer sleeve is fixedly connected to the left end of the connecting part. The guide cone (240) is fixed to the left end of the inner spiral (220). A composite channel (241) is provided between the outer wall of the guide cone (240) and the inner wall of the extruder (210). An air chamber (242) is formed through the middle of the guide cone (240) from left to right. The right end of the air chamber (242) is connected to the air inlet pipe (140).

8. An extrusion die for preventing crossflow between internal and external channels as described in claim 6, characterized in that: An external extrusion channel (231) is provided between the outer wall of the outer spiral (230) and the inner wall of the spiral jacket. The right end of the external extrusion channel (231) is connected to the left end of the six feed channels (122).

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