PVC (polyvinyl chloride) molding granulation mold

Abstract

The utility model relates to a PVC (Polyvinyl Chloride) molding granulation mould which comprises an outer mould body, a granulation head and a shunting head, a shunting cavity is formed between the shunting head and the outer mould body, the shunting cavity is sequentially communicated with a first-stage drainage groove, a second-stage drainage groove and a molding hole on the granulation head, and the sections of the first-stage drainage groove and the second-stage drainage groove are annular in the direction vertical to the axis of the granulation head; in the direction parallel to the axis of the granulation head, the cross sections of the first-stage drainage groove and the second-stage drainage groove are isosceles trapezoids, the feeding ports of the first-stage drainage groove and the second-stage drainage groove are larger than the discharging ports of the first-stage drainage groove and the second-stage drainage groove respectively, and the forming holes are distributed in the second-stage drainage groove in a circumferential array mode. According to the scheme, the flow guide groove and the secondary flow guide groove which can guide flow and pressurize are formed in the granulation head, so that pressure borne by molten raw materials in the granulation head is more uniform, the flow speed is more stable, the raw materials can pass through the forming holes more smoothly, the problem of material stagnation is avoided, meanwhile, particles formed through extrusion can be completely plasticized, and the granulation efficiency is improved. And the particle diameter is uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of granulation moulds, in particular to a PVC forming granulation mould. Background Art

[0002] Granulation refers to the process of processing waste plastics or plastic raw materials into small particles using a granulation mold. Compared with waste plastics, plastic particles after granulation are more uniform and delicate, which is not only convenient for transportation and storage, but also can be processed as raw materials for plastic products, which can realize resource recycling and achieve the purpose of environmental protection and energy saving.

[0003] In the traditional PVC granulation molding die, the molten PVC raw material is extruded from the hot die and cut into particles by a rotating knife rotating against the die surface. After the particles are cut, they are cooled and formed to complete the hot cutting granulation. In the PVC granulation production process, the granulator head is responsible for extruding the wire and is also used as a pelletizing die. However, when the granulator head in the prior art is working, due to the difference in internal pressure of the granulator head and material flow rate, there is a material stagnation area in the extrusion molding die, the particles produced by the granulator head are not completely plasticized, and the molded particles have uneven diameters. Adding such particles to the powder material for producing pipes will result in poor plasticization of the product, unstable size, and reduced product performance. Utility Model Content

[0004] The utility model provides a PVC forming granulation die to solve the problem that the internal pressure of the granulation head and the material flow rate are different in the above-mentioned prior art solutions, resulting in a material stagnation area in the extrusion molding die. The PVC forming granulation die in this solution can prevent the material stagnation, avoid the problems of incomplete plasticization of particles and uneven diameter of formed particles.

[0005] The technical scheme adopted by the utility model is: a PVC forming granulation mold, comprising an outer mold body, a granulation head connected to the outer mold body and a diverter head located in the inner cavity of the outer mold body, the diverter head is fixedly connected to the granulation head, a diverter cavity is formed between the diverter head and the outer mold body, the diverter cavity and the primary drainage groove, the secondary drainage groove and the forming hole on the granulation head are connected in sequence, in the direction perpendicular to the axis of the granulation head, the cross sections of the primary drainage groove and the secondary drainage groove are both annular; in the direction parallel to the axis of the granulation head, the cross sections of the primary drainage groove and the secondary drainage groove are both isosceles trapezoidal, the feed ports of the primary drainage groove and the secondary drainage groove are both larger than their respective discharge ports, and the forming holes are arranged in a circular array on the secondary drainage groove.

[0006] When the mold is working, the molten raw material flows from the feed port of the outer mold body to the diversion cavity in the outer mold body, and continues to move forward in the diversion cavity. When it flows through the primary drainage groove, since the feed port of the primary drainage groove is larger than the discharge port, the primary drainage groove compresses the raw material, so that the pressure on the raw material flowing through the primary drainage groove in the mold becomes greater, so that the raw material becomes dense after being evenly stressed, and quickly passes through the primary drainage groove. Then the raw material passes through the secondary drainage groove. Since the feed port of the secondary drainage groove is also larger than the discharge port, the secondary drainage groove will compress the raw material again, so that the raw material is more evenly stressed after the second stress, and the flow rate is faster and more stable. After the raw material flowing out of the secondary drainage groove enters the forming hole, it can maintain a stable flow rate and pass through the forming hole smoothly. Under the pressure of the forming hole, the diameter and thickness of the formed particles are also more uniform.

[0007] The granulation head in this scheme is provided with a drainage groove and a secondary drainage groove that can divert and increase pressure, so that the pressure on the molten raw material in the granulation head is more uniform, the flow rate is more stable, the raw material can pass through the forming hole more smoothly, avoiding the problem of material stagnation, and at the same time the extruded particles can be completely plasticized, so that the particle diameter is uniform.

[0008] Preferably, there are several secondary drainage grooves, and the cross-sections of the several secondary drainage grooves in the direction perpendicular to the axis of the granulation head are concentric rings, and the isosceles trapezoidal cross-sections in the direction parallel to the axis of the granulation head are the same. A plurality of secondary drainage grooves connected to the primary drainage groove are provided, and each secondary drainage groove has a plurality of forming holes arranged in a circumferential array, so that the mold can further improve the production efficiency of the formed particles without affecting the quality of the formed particles.

[0009] Preferably, the forming hole includes a primary forming hole and a secondary forming hole, in a direction parallel to the axis of the granulation head, the cross section of the primary forming hole is an isosceles trapezoid, the feed port of the primary forming hole is larger than the discharge port, the feed port width D1 of the primary forming hole is the same as the width L2 of the discharge port of the secondary drainage groove, and the side wall of the secondary forming hole is parallel to the axis of the granulation head. The forming hole also includes a primary forming hole, the primary forming hole can drain the raw material entering the forming hole from the secondary drainage groove, and can also increase the pressure of the raw material entering the secondary forming hole, so that the flow rate of the raw material passing through the secondary forming hole is more stable and the pressure is more uniform. The feed port width of the primary forming hole is the same as the width of the discharge port of the secondary drainage groove, so that the molten raw material can flow smoothly into the primary forming hole, avoiding the raw material from being retained between the primary forming hole and the secondary drainage groove.

[0010] Preferably, the length L1 of the secondary forming hole is 5-9 times the width D2 of the secondary forming hole. The length of the secondary forming hole is related to the plasticization degree of the molten raw material and the uniformity of the particle size. Experiments have shown that when the length of the secondary forming hole is 5-9 times the width of the secondary forming hole, it can ensure that the extruded molten raw material is sufficiently plasticized and the particle size is uniform. The specific length can take different values ​​according to the differences in different raw materials. If the recycled material itself is filled more, the multiple takes a small value. If the raw material filling and impurities are small, the multiple takes a large value.

[0011] Preferably, the inclination angle of the side wall of the secondary drainage groove is the same as the inclination angle of the side wall of the primary drainage groove. The width of the feed port of the diverter chamber is greater than the width of the discharge port of the diverter chamber, and an arc chamfer is provided on the diverter head to prevent the fluid from being retained in the diverter chamber. The inclination angle of the side wall of the secondary drainage groove is the same as the inclination angle of the side wall of the primary drainage groove, so that when the molten raw material enters the secondary drainage groove from the primary drainage groove, it will not be retained between the primary drainage groove and the secondary drainage groove. The width of the feed port of the diverter chamber is greater than the width of the discharge port of the diverter chamber, which can perform preliminary diversion and compression on the molten raw material, further making the raw material evenly subjected to pressure, and the diameter of the molded particles after plasticization is equal. The arc chamfer on the diverter head provides an arc transition where the fluid passes, further avoiding the retention of raw materials.

[0012] Preferably, it also includes a diverter seat, which is provided with two discharge ports, each of which is connected to an outer mold body, and the two discharge ports are symmetrically arranged with the axis of the diverter seat as the symmetry axis. The discharge port of the diverter seat is also provided with a flow control ring for controlling the flow rate of the diverter seat discharge port, the flow control ring is detachably connected to the diverter seat, and the two ends of the flow control ring are respectively connected to the diverter seat and the outer mold body. After the diverter seat is set, the mold can supply molten raw materials to two outer mold bodies at the same time, and the two outer mold bodies work at the same time, further improving the working efficiency of the mold. The flow control rings with different inner ring sizes can be replaced to preliminarily control the flow rate of the molten raw materials entering the inner cavity of the outer mold body.

[0013] Preferably, the flow channel of the diverter seat includes a feed flow channel and a diverter flow channel, and the ratio of the width d1 of the feed flow channel to the width d2 of the diverter flow channel is 2.1:1-2.3:1. The angle α between the axes of the two diverter flow channels is 30°.

[0014] -60°. Experiments have shown that when the flow channel of the manifold seat includes a feed flow channel and a manifold, the ratio of the width of the feed flow channel to the width of the manifold is 2.1:1-2.3:1, and the angle α between the axes of the two manifolds is between 30°-60°, it can ensure that the molten raw material is effectively initially compressed in the manifold seat and forcibly distributed into two streams of molten raw material.

[0015] Compared with the prior art, the beneficial effect of the utility model lies in that: the granulation head in the present scheme is provided with a drainage groove and a secondary drainage groove that can divert and increase pressure, so that the pressure on the molten raw material in the granulation head is more uniform, the flow rate is more stable, the raw material can pass through the forming hole more smoothly, avoiding the problem of material stagnation, and at the same time, the extruded particles can also be completely plasticized, so that the particle diameter is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the internal structure of a PVC molding and granulation mold of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of a granulation head of a PVC forming granulation mold of the utility model;

[0018] Figure 3 This utility model is a PVC molding granulation mold Figure 2 The structural diagram of the secondary drainage trough in the middle A part;

[0019] Figure 4 This utility model is a PVC molding granulation mold Figure 2 Schematic diagram of the structure of the forming hole in part B. DETAILED DESCRIPTION

[0020] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0021] The same or similar numbers 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 the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0023] Example 1

[0024] like Figure 1-Figure 4 The figure shows an embodiment 1 of a PVC molding granulation mold, comprising an outer mold body 1, a granulation head 2 connected to the outer mold body 1, and a diverter head 3 located in the inner cavity of the outer mold body 1, the diverter head 3 is fixedly connected to the granulation head 2, and a diverter cavity 4 is formed between the diverter head 3 and the outer mold body 1, and the diverter cavity 4 and the primary drainage groove 201, the secondary drainage groove 202 and the molding hole on the granulation head 2 are connected in sequence, in the direction perpendicular to the axis of the granulation head 2, the cross-sections of the primary drainage groove 201 and the secondary drainage groove 202 are both annular; in the direction parallel to the axis of the granulation head 2, the cross-sections of the primary drainage groove 201 and the secondary drainage groove 202 are both isosceles trapezoidal, the feed ports of the primary drainage groove 201 and the secondary drainage groove 202 are both larger than their respective discharge ports, and the molding holes are arranged in a circular array on the secondary drainage groove 202.

[0025] The working principle or working process of this embodiment: when the mold is working, the molten raw material flows from the feed port of the outer mold body 1 in the mold to the diverter cavity 4 in the outer mold body 1, and continues to move forward in the diverter cavity 4. When flowing through the primary drainage groove 201, since the feed port of the primary drainage groove 201 is larger than the discharge port, the primary drainage groove 201 compresses the raw material, so that the pressure on the raw material flowing through the primary drainage groove 201 in the mold becomes larger, so that the raw material becomes dense after being uniformly stressed, and quickly passes through the primary drainage groove 201. Then the raw material passes through the secondary drainage groove 202. Since the feed port of the secondary drainage groove 202 is also larger than the discharge port, the secondary drainage groove 202 will compress the raw material again, so that the raw material is more uniformly stressed after the second stress, and the flow rate is faster and more stable. After the raw material flowing out of the secondary drainage groove 202 enters the forming hole, it can maintain a stable flow rate and pass through the forming hole smoothly. Under the pressure of the forming hole, the diameter and thickness of the formed particles are also more uniform.

[0026] Beneficial effects of this embodiment: The granulation head 2 in this scheme is provided with a drainage groove and a secondary drainage groove 202 that can divert and increase pressure, so that the pressure on the molten raw material in the granulation head 2 is more uniform, the flow rate is more stable, the raw material can pass through the forming hole more smoothly, avoiding the problem of material stagnation, and at the same time, the extruded particles can also be completely plasticized, so that the particle diameter is uniform.

[0027] Example 2

[0028] A PVC forming granulation die embodiment 2, such as Figure 1-Figure 4 As shown, based on Example 1, the internal structure of the outer model body 1 is further limited.

[0029] Specifically, there are a plurality of secondary drainage grooves 202 , and the cross sections of the plurality of secondary drainage grooves 202 in the direction perpendicular to the axis of the granulation head 2 are concentric rings, and the cross sections in the direction parallel to the axis of the granulation head 2 are the same isosceles trapezoidal shape.

[0030] Specifically, the forming holes include a primary forming hole 203 and a secondary forming hole 204. In the direction parallel to the axis of the granulation head 2, the cross-section of the primary forming hole 203 is an isosceles trapezoid. The feed port of the primary forming hole 203 is larger than the discharge port. The feed port width D1 of the primary forming hole 203 is the same as the width L2 of the discharge port of the secondary drainage groove 202. The side wall of the secondary forming hole 204 is parallel to the axis of the granulation head 2.

[0031] Specifically, the length L1 of the secondary forming hole 204 is 5-9 times the width D2 of the secondary forming hole 204. The specific length can take different values ​​according to the difference of different raw materials. If the backfill itself is more, the multiple is a small value. If the raw material filling and impurities are small, the multiple is a large value. The inclination angle of the side wall of the secondary drainage groove 202 is the same as the inclination angle of the side wall of the primary drainage groove 201. The width of the feed port of the diverter cavity 4 is greater than the width of the discharge port of the diverter cavity 4. The diverter head 3 is provided with an arc chamfer to prevent the fluid from being retained in the diverter cavity 4.

[0032] Beneficial effects of this embodiment: multiple secondary drainage grooves 202 connected to the primary drainage groove 201 are provided, and multiple forming holes are arranged in a circumferential array on each secondary drainage groove 202, so that the mold can further improve the production efficiency of the formed particles without affecting the quality of the formed particles. The forming holes also include a primary forming hole 203, which can drain the raw materials entering the forming hole from the secondary drainage groove 202, and can also increase the pressure of the raw materials entering the secondary forming hole 204, so that the flow rate of the raw materials passing through the secondary forming hole 204 is more stable and the pressure is more uniform. The width of the feed port of the primary forming hole 203 is the same as the width of the discharge port of the secondary drainage groove 202, so that the molten raw materials can flow smoothly into the primary forming hole 203, avoiding the raw materials from being retained between the primary forming hole 203 and the secondary drainage groove 202. When the length of the secondary forming hole 204 is 5-9 times the width of the secondary forming hole 204, it can ensure that the extruded molten raw materials are sufficiently plasticized and the particle size is uniform. The inclination angle of the side wall of the secondary drainage groove 202 is the same as the inclination angle of the side wall of the primary drainage groove 201, so that when the molten raw material enters the secondary drainage groove 202 from the primary drainage groove 201, it will not be retained between the primary drainage groove 201 and the secondary drainage groove 202. The width of the feed port of the diverter cavity 4 is greater than the width of the discharge port of the diverter cavity 4, which can perform preliminary diversion compression on the molten raw material, further making the raw material evenly subjected to pressure, and the diameter of the formed particles after plasticization is equal. The arc chamfer on the diverter head 3 provides an arc transition where the fluid passes, further avoiding the retention of raw materials.

[0033] Example 3

[0034] A PVC forming granulation die embodiment 3, such as Figure 1As shown, on the basis of Example 1 or Example 2, it further includes a diverter seat 5, on which two discharge ports are provided, each of which is connected to an outer mold body 1, and the two discharge ports are symmetrically arranged with the axis of the diverter seat 5 as the symmetry axis. A flow control ring 6 for controlling the flow rate of the discharge port of the diverter seat 5 is also provided on the discharge port of the diverter seat 5, and the flow control ring 6 is detachably connected to the diverter seat 5, and the two ends of the flow control ring 6 are respectively connected to the diverter seat 5 and the outer mold body 1.

[0035] Specifically, the flow channel of the flow splitter seat 5 includes a feed flow channel 501 and a split flow channel 502, and the ratio of the width d1 of the feed flow channel 501 to the width d2 of the split flow channel 502 is 2.1:1-2.3:1. The angle α between the axes of the two split flow channels 502 is 30°-60°.

[0036] Beneficial effects of this embodiment: After the diverter seat 5 is set, the mold can supply molten raw materials to two outer mold bodies 1 at the same time, and the two outer mold bodies 1 work at the same time, further improving the working efficiency of the mold. The flow control ring 6 with different inner ring sizes can be replaced to preliminarily control the flow of the molten raw material entering the inner cavity of the outer mold body 1. When the flow channel of the diverter seat 5 includes a feed flow channel 501 and a diverter flow channel 502, the ratio of the width of the feed flow channel 501 to the width of the diverter flow channel 502 is 2.1-2.3, and the angle α between the axes of the two diverter flow channels 502 is between 30°-60°, it can ensure that the molten raw material is effectively preliminarily compressed in the diverter seat 5 and forced to be distributed into two streams of molten raw materials.

[0037] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A PVC forming and granulating mold, characterized in that: The invention comprises an outer mold body (1), a granulation head (2) connected to the outer mold body (1), and a diverter head (3) located in the inner cavity of the outer mold body (1); the diverter head (3) is fixedly connected to the granulation head (2); a diverter cavity (4) is formed between the diverter head (3) and the outer mold body (1); the diverter cavity (4) is connected to a primary drainage groove (201), a secondary drainage groove (202) and a forming hole on the granulation head (2) in sequence; In a direction perpendicular to the axis of the granulation head (2), the cross-sections of the primary drainage groove (201) and the secondary drainage groove (202) are both annular; in a direction parallel to the axis of the granulation head (2), the cross-sections of the primary drainage groove (201) and the secondary drainage groove (202) are both isosceles trapezoidal, the feed ports of the primary drainage groove (201) and the secondary drainage groove (202) are both larger than their respective discharge ports, and the forming holes are arranged in a circular array on the secondary drainage groove (202).

2. A PVC forming and granulating mold according to claim 1, characterized in that: There are a plurality of secondary drainage grooves (202), and the cross-sections of the plurality of secondary drainage grooves (202) in a direction perpendicular to the axis of the granulation head (2) are concentric rings, and the isosceles trapezoidal cross-sections in a direction parallel to the axis of the granulation head (2) are the same.

3. A PVC forming and granulating mold according to claim 1, characterized in that: The forming holes include a primary forming hole (203) and a secondary forming hole (204); in a direction parallel to the axis of the granulation head (2), the cross section of the primary forming hole (203) is an isosceles trapezoid; the feed port of the primary forming hole (203) is larger than the discharge port; the feed port width D1 of the primary forming hole (203) is the same as the discharge port width L2 of the secondary drainage groove (202); and the side wall of the secondary forming hole (204) is parallel to the axis of the granulation head (2).

4. A PVC forming and granulating mold according to claim 3, characterized in that: The length L1 of the secondary forming hole (204) is 5-9 times the width D2 of the secondary forming hole (204).

5. A PVC forming and granulating die according to claim 3, characterized in that: The inclination angle of the side wall of the secondary drainage groove (202) is the same as the inclination angle of the side wall of the primary drainage groove (201).

6. A PVC forming and granulating mold according to claim 1, characterized in that: The width of the feed inlet of the diverter chamber (4) is greater than the width of the discharge outlet of the diverter chamber (4), and the diverter head (3) is provided with an arc chamfer to prevent the fluid from being retained in the diverter chamber (4).

7. A PVC forming and granulating mold according to claim 1, characterized in that: It also includes a diverter seat (5), the diverter seat (5) is provided with two discharge ports, each of the discharge ports is connected to one of the outer mold bodies (1), and the two discharge ports are symmetrically arranged with the axis of the diverter seat (5) as the symmetry axis.

8. A PVC forming and granulating die according to claim 7, characterized in that: The outlet of the diverter seat (5) is also provided with a flow control ring (6) for controlling the flow rate at the outlet of the diverter seat (5); the flow control ring (6) is detachably connected to the diverter seat (5); and the two ends of the flow control ring (6) are respectively connected to the diverter seat (5) and the outer mold body (1).

9. A PVC forming and granulating die according to claim 8, characterized in that: The flow channel of the diverter seat (5) comprises a feed flow channel (501) and a diverter flow channel (502), and the ratio of the width d1 of the feed flow channel (501) to the width d2 of the diverter flow channel (502) is 2.1:1-2.3:

1.

10. A PVC forming and granulating mold according to claim 9, characterized in that: The included angle α between the axes of the two branch flow channels (502) is 30°-60°.

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