Three-layer composite pipe die

Abstract

The utility model discloses a three-layer composite pipe die which is characterized in that a rear feeding end of an inner-layer spiral body is fixed on an inner-layer spiral body base, a middle-layer spiral body is sleeved outside the inner-layer spiral body and the inner-layer spiral body base, and the middle-layer spiral body, the inner-layer spiral body and the inner-layer spiral body base form an inner-layer runner; the rear feeding end of the middle-layer spiral body is fixed to the middle-layer spiral body base, the middle-layer spiral body and the middle-layer spiral body base are sleeved with the outer-layer spiral body, and the outer-layer spiral body, the middle-layer spiral body and the middle-layer spiral body base form a middle-layer flow channel; the rear feeding end of the outer-layer spiral body is fixed to the outer-layer spiral body base, the outer mold body is arranged outside the outer-layer spiral body and the outer-layer spiral body base in a sleeving mode, and the outer mold body, the outer-layer spiral body and the outer-layer spiral body base form an outer-layer flow channel; and the rear feeding end of the mold outer body is fixed on the mold back plate. The utility model has the advantages that each spiral body is not easy to be eccentric and materials are not easy to leak during long-term use.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic pipe extrusion production equipment, in particular to a three-layer composite pipe die. Background Art

[0002] In the process of plastic pipe extrusion production, the mold plays a very critical role in product quality and appearance. The role of the mold is to establish a certain extrusion pressure and cooperate with the extruder to fully plasticize the extruded melt and pass through the entire mold section.

[0003] like Figure 1 As shown, the three-layer composite mold currently used in the market has a structure comprising: a mold outer body 111, an inner spiral body 112, a middle spiral body 113 and an outer spiral body 114 are sequentially sleeved inside the mold outer body 111 from the inside to the outside, and a mold back plate 115 is simultaneously tightly fixed to the rear end face of the mold outer body 111, the rear end face of the inner spiral body 112, the rear end face of the middle spiral body 113 and the rear end face of the outer spiral body 114; the inner spiral body 112, The middle layer spiral body 113 and the mold back plate 115 form an inner layer flow channel 116; the middle layer spiral body 113, the outer layer spiral body 114 and the mold back plate 115 form a middle layer flow channel 117; the outer layer spiral body 114, the mold outer body 111 and the mold back plate 115 form an outer layer flow channel 118; side feed channels 119 for feeding materials to the inner layer flow channel 116, the middle layer flow channel 117 and the outer layer flow channel 118 are respectively arranged on the side walls of the mold outer body 111.

[0004] The above three-layer composite mold has the following disadvantages: (1) It adopts the side feeding mode, and the side of the spiral body is subjected to the feeding pressure. Long-term use will cause the spiral body to be eccentric. The eccentricity of the spiral body will cause uneven stratification of the three layers and large deviation of the wall thickness of the three layers, thus affecting the product quality; (2) The mold back plate will directly bear the feeding pressure of the inner layer flow channel, the middle layer flow channel and the outer layer flow channel at the same time. The extrusion pressure on the mold back plate is large, which makes the connection between the mold back plate and the mold outer body easy to loosen and produce a gap. The raw material is easy to leak from the gap between the mold back plate and the mold outer body, resulting in a waste of raw materials and an increase in the production and use costs of the enterprise. Utility Model Content

[0005] The utility model aims to provide a three-layer composite pipe mould in which each spiral body is not easy to be eccentric and not easy to leak material during long-term use.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a three-layer composite pipe mold, including an inner layer spiral body, an intermediate layer spiral body, an outer layer spiral body, a mold outer body, an inner layer spiral body base, an intermediate layer spiral body base, an outer layer spiral body base, and a mold back plate;

[0007] The rear feed end of the inner spiral is fixed on the inner spiral base, the middle spiral is sleeved on the outside of the inner spiral and the inner spiral base, and the middle spiral, the inner spiral and the inner spiral base form an inner flow channel;

[0008] The rear feed end of the middle layer spiral is fixed on the middle layer spiral base, the outer layer spiral is sleeved on the outside of the middle layer spiral and the middle layer spiral base, and the outer layer spiral, the middle layer spiral and the middle layer spiral base form a middle layer flow channel;

[0009] The rear feed end of the outer spiral is fixed on the outer spiral base, the outer mold body is sleeved on the outer layer of the outer spiral and the outer spiral base, and the outer mold body, the outer spiral and the outer spiral base form an outer flow channel;

[0010] The rear feed end of the mold outer body is fixed to the mold back plate;

[0011] A plurality of first inlets connected to the inner layer flow channel are evenly distributed along the circumferential direction on the front end surface of the inner layer spiral base where the inner layer flow channel is located, a first feed slot is arranged on the rear feed end surface of the inner layer spiral base, each first inlet is connected to the first feed slot through a first flow channel arranged in the inner layer spiral base, a second feed hole corresponding to the first feed slot is arranged on the middle layer spiral base, a third feed hole corresponding to the second feed hole is arranged on the outer layer spiral base, and a fourth feed hole corresponding to the third feed hole is arranged on the mold back plate, the fourth feed hole, the third feed hole, the second feed hole, the first feed slot, the first flow channels and the first inlets together form a rear feed channel of the inner layer flow channel for feeding the inner layer flow channel;

[0012] A plurality of second inlets connected to the middle layer flow channel are evenly distributed along the circumferential direction on the front end surface of the middle layer spiral base where the middle layer flow channel is located, a second feed slot is arranged on the rear feed end surface of the middle layer spiral base, each second inlet is connected to the second feed slot through a second flow channel arranged in the middle layer spiral base, a fifth feed hole corresponding to the second feed slot is arranged on the outer layer spiral base, a sixth feed hole corresponding to the fifth feed hole is arranged on the mold back plate, the sixth feed hole, the fifth feed hole, the second feed slot, each second flow channel and each second inlet together form a rear feed channel of the middle layer flow channel for feeding the middle layer flow channel;

[0013] A number of third inlets connected to the outer layer flow channel are evenly distributed along the circumferential direction on the front end surface of the outer layer spiral base where the outer layer flow channel is located, and a third feed slot is arranged on the rear feed end surface of the outer layer spiral base, and each third inlet is connected to the third feed slot through a third flow channel arranged in the outer layer spiral base, and a seventh feed hole corresponding to the third feed slot is arranged on the back plate of the mold, and the seventh feed hole, the third feed slot, each third flow channel and each third inlet together form a rear feed channel of the outer layer flow channel for feeding the outer layer flow channel.

[0014] Furthermore, the aforementioned three-layer composite pipe mold, wherein: the inner layer spiral and the inner layer spiral base, the middle layer spiral and the middle layer spiral base, the outer layer spiral and the outer layer spiral base, and the mold outer body and the mold back plate are all locked and fixed by bolts.

[0015] Furthermore, in the aforementioned three-layer composite pipe mold, the inner layer spiral body base, the middle layer spiral body base and the outer layer spiral body base are all fixed to the mold back plate by bolts.

[0016] Through the implementation of the above technical scheme, the beneficial effects of the utility model are: (1) by adopting the rear feeding mode, the side of the spiral body will not be subjected to pressure, ensuring that the spiral body will not be eccentric during the long-term use of the mold, thereby ensuring the uniformity of the three-layer stratification and ensuring the product quality; (2) the feeding pressure of each flow channel is directly borne by its respective matching spiral body base, and the mold back plate no longer directly bears the feeding pressure from the inner layer flow channel, the middle layer flow channel and the outer layer flow channel, so that the mold back plate can always be tightly connected with the mold outer body, so that the raw material is not easy to leak from the connection between the mold back plate and the mold outer body, thereby reducing the waste of raw materials and reducing the production and use costs of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the three-layer composite pipe mold described in the background technology.

[0018] Figure 2 It is a structural schematic diagram of a three-layer composite pipe mold described in the utility model.

[0019] Figure 3 It is a schematic diagram of the connection relationship between the first feed slot, the first flow channel and the first inlet in the inner spiral base.

[0020] Figure 4 It is a schematic diagram of the connection relationship between the second feed slot, the second flow channel and the second inlet in the middle layer spiral base.

[0021] Figure 5 It is a schematic diagram of the connection relationship between the third feed slot, the third flow channel and the third inlet in the outer spiral base. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the three-layer composite pipe mold comprises an inner spiral body 1, an intermediate spiral body 2, an outer spiral body 3, a mold outer body 4, an inner spiral body base 5, an intermediate spiral body base 6, an outer spiral body base 7, and a mold back plate 8;

[0024] The rear feed end of the inner spiral body 1 is fixed to the inner spiral body base 5 by bolts, and the middle spiral body 2 is sleeved on the outer part of the inner spiral body 1 and the inner spiral body base 5, and the middle spiral body 2, the inner spiral body 1 and the inner spiral body base 5 form an inner flow channel 9;

[0025] The rear feed end of the middle layer spiral body 2 is fixed to the middle layer spiral body base 6 by bolts, and the outer layer spiral body 3 is sleeved on the outside of the middle layer spiral body 2 and the middle layer spiral body base 6, and the outer layer spiral body 3, the middle layer spiral body 2 and the middle layer spiral body base 6 form a middle layer flow channel 10;

[0026] The rear feed end of the outer spiral body 3 is fixed to the outer spiral body base 7 by bolts, and the mold outer body 4 is sleeved on the outside of the outer spiral body 3 and the outer spiral body base 7, and the mold outer body 4, the outer spiral body 3 and the outer spiral body base 7 form an outer layer flow channel 11; the rear feed end of the mold outer body 4 is fixed to the mold back plate 8 by bolts; the inner spiral body base 5, the middle spiral body base 6 and the outer spiral body base 7 are all fixed to the mold back plate 8 by bolts;

[0027] On the front end surface of the inner spiral base where the inner layer flow channel 9 is located, a plurality of first inlets 12 connected to the inner layer flow channel 9 are evenly distributed along the circumferential direction, and a first feed slot 13 is arranged on the rear feed end surface of the inner layer spiral base 5, each first inlet 12 is connected to the first feed slot 13 through a first flow channel 14 arranged in the inner layer spiral base 5, and a second feed hole 15 corresponding to the first feed slot 13 is arranged on the middle layer spiral base 6, and a third feed hole 16 corresponding to the second feed hole 15 is arranged on the outer layer spiral base 7, and a fourth feed hole 17 corresponding to the third feed hole 16 is arranged on the mold back plate 8, and the fourth feed hole 17, the third feed hole 16, the second feed hole 15, the first feed slot 13, the first flow channels 14 and the first inlets 12 together form an inner layer flow channel rear feed channel for feeding into the inner layer flow channel 9;

[0028] On the front end surface of the intermediate layer spiral body base 6 where the intermediate layer flow channel 10 is located, a plurality of second inlets 18 connected to the intermediate layer flow channel 11 are uniformly distributed along the circumferential direction, and a second feed slot 19 is arranged on the rear feed end surface of the intermediate layer spiral body base 6, and each second inlet 18 is connected to the second feed slot 19 through a second flow channel 20 arranged in the intermediate layer spiral body base 6, and a fifth feed hole 21 corresponding to the second feed slot 19 is arranged on the outer layer spiral body base 7, and a sixth feed hole 22 corresponding to the fifth feed hole 21 is arranged on the mold back plate 8, and the sixth feed hole 22, the fifth feed hole 21, the second feed slot 19, each second flow channel 20 and each second inlet 18 together form an intermediate layer flow channel rear feed channel for feeding the intermediate layer flow channel 10;

[0029] A plurality of third inlets 23 connected to the outer layer flow channel 11 are evenly distributed along the circumferential direction on the front end surface of the outer layer spiral base 7 where the outer layer flow channel 11 is located, and a third feed slot 24 is arranged on the rear feed end surface of the outer layer spiral base 7, each third inlet 23 is connected to the third feed slot 24 through a third flow channel 25 arranged in the outer layer spiral base 7, and a seventh feed hole 26 corresponding to the third feed slot 24 is arranged on the mold back plate 8, and the seventh feed hole 26, the third feed slot 24, each third flow channel 25 and each third inlet 23 together form an outer layer flow channel rear feed channel for feeding the outer layer flow channel 11;

[0030] When in use, the material extruded by the inner layer extruder enters the first feed slot 13 of the rear end face of the inner layer spiral base 5 through the fourth feed hole 17, the third feed hole 16, and the second feed hole 15 in sequence, and then passes through each first flow channel 14 in the inner layer spiral base 5, and then evenly enters the inner layer flow channel 9 from each first inlet 12. In the process of feeding the inner layer flow channel 9 in the rear feeding mode, the inner layer spiral base 6 plays the role of diverting the flow to bear the inner layer extrusion pressure, so as to prevent the mold back plate 8 from directly bearing the inner layer extrusion pressure; The material extruded by the middle layer extruder enters the second feed slot 19 of the rear end face of the middle layer spiral base 6 through the sixth feed hole 22 and the fifth feed hole 21 in turn, and then enters the middle layer flow channel 10 evenly from each second inlet 18 after passing through each second flow channel 20 in the middle layer spiral base 6. In the process of feeding the middle layer flow channel 10 in the rear feeding mode, the middle layer spiral base 6 plays the role of diverting the flow to bear the middle layer extrusion pressure, so as to prevent the mold back plate 8 from directly bearing the middle layer extrusion pressure; the outer layer extruder The material extruded out of the machine enters the third feed slot 24 on the rear end face of the outer spiral base 7 through the seventh feed hole 26 in turn, and then passes through the third flow channels 25 in the outer spiral base 7, and then evenly enters the outer flow channel 11 from the third inlets 23. In the process of feeding the outer flow channel 11 using the rear feeding mode, the outer spiral base 7 plays a role in diverting the flow to bear the outer layer extrusion pressure, thereby preventing the mold back plate 8 from directly bearing the outer layer extrusion pressure; since the feed pressure of each flow channel is directly borne by its own matching spiral base, the mold back plate no longer directly bears the feed pressure from the inner layer flow channel, the middle layer flow channel and the outer layer flow channel, so that the mold back plate can always be tightly connected to the mold outer body, so that the raw material is not easy to leak from the connection between the mold back plate and the mold outer body, thereby reducing raw material waste and reducing the production and use costs of the enterprise; and because the rear feeding mode is adopted, the side of the spiral will not be under pressure, ensuring that the spiral will not be eccentric during the long-term use of the mold, thereby ensuring the uniformity of the three-layer stratification and ensuring product quality.

[0031] The advantages of the present invention are: (1) by adopting the rear feeding mode, the side of the spiral body will not be subjected to pressure, ensuring that the spiral body will not be eccentric during the long-term use of the mold, thereby ensuring the uniformity of the three-layer stratification and ensuring product quality; (2) the feeding pressure of each flow channel is directly borne by the corresponding spiral body base, and the mold back plate no longer directly bears the feeding pressure from the inner layer flow channel, the middle layer flow channel and the outer layer flow channel, so that the mold back plate can always be tightly connected with the mold outer body, so that the raw material is not easy to leak from the connection between the mold back plate and the mold outer body, thereby reducing the waste of raw materials and reducing the production and use costs of the enterprise.

[0032] The above description is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A three-layer composite pipe mold, characterized in that: It includes an inner spiral body, a middle spiral body, an outer spiral body, a mold outer body, an inner spiral body base, a middle spiral body base, an outer spiral body base, and a mold back plate; The rear feed end of the inner spiral is fixed on the inner spiral base, the middle spiral is sleeved on the outside of the inner spiral and the inner spiral base, and the middle spiral, the inner spiral and the inner spiral base form an inner flow channel; The rear feed end of the middle layer spiral is fixed on the middle layer spiral base, the outer layer spiral is sleeved on the outside of the middle layer spiral and the middle layer spiral base, and the outer layer spiral, the middle layer spiral and the middle layer spiral base form a middle layer flow channel; The rear feed end of the outer spiral is fixed on the outer spiral base, the outer mold body is sleeved on the outer layer of the outer spiral and the outer spiral base, and the outer mold body, the outer spiral and the outer spiral base form an outer flow channel; The rear feed end of the mold outer body is fixed on the mold back plate; A plurality of first inlets connected to the inner layer flow channel are evenly distributed along the circumferential direction on the front end surface of the inner layer spiral base where the inner layer flow channel is located, a first feed slot is arranged on the rear feed end surface of the inner layer spiral base, each first inlet is connected to the first feed slot through a first flow channel arranged in the inner layer spiral base, a second feed hole corresponding to the first feed slot is arranged on the middle layer spiral base, a third feed hole corresponding to the second feed hole is arranged on the outer layer spiral base, and a fourth feed hole corresponding to the third feed hole is arranged on the mold back plate, the fourth feed hole, the third feed hole, the second feed hole, the first feed slot, the first flow channels and the first inlets together form a rear feed channel of the inner layer flow channel for feeding the inner layer flow channel; A plurality of second inlets connected to the middle layer flow channel are evenly distributed along the circumferential direction on the front end surface of the middle layer spiral base where the middle layer flow channel is located, a second feed slot is arranged on the rear feed end surface of the middle layer spiral base, each second inlet is connected to the second feed slot through a second flow channel arranged in the middle layer spiral base, a fifth feed hole corresponding to the second feed slot is arranged on the outer layer spiral base, a sixth feed hole corresponding to the fifth feed hole is arranged on the mold back plate, the sixth feed hole, the fifth feed hole, the second feed slot, each second flow channel and each second inlet together form a rear feed channel of the middle layer flow channel for feeding the middle layer flow channel; A number of third inlets connected to the outer layer flow channel are evenly distributed along the circumferential direction on the front end surface of the outer layer spiral base where the outer layer flow channel is located, and a third feed slot is arranged on the rear feed end surface of the outer layer spiral base, and each third inlet is connected to the third feed slot through a third flow channel arranged in the outer layer spiral base, and a seventh feed hole corresponding to the third feed slot is arranged on the back plate of the mold, and the seventh feed hole, the third feed slot, each third flow channel and each third inlet together form a rear feed channel of the outer layer flow channel for feeding the outer layer flow channel.

2. A three-layer composite pipe mold according to claim 1, characterized in that: The inner spiral body and the inner spiral body base, the middle spiral body and the middle spiral body base, the outer spiral body and the outer spiral body base, and the mold outer body and the mold back plate are all locked and fixed by bolts.

3. The three-layer composite pipe mold according to claim 1, characterized in that: The inner layer spiral body base, the middle layer spiral body base and the outer layer spiral body base are all fixed to the mold back plate by bolts.

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