Multi-layer extrusion die head capable of rapidly changing colors

Abstract

The utility model discloses a multi-layer extrusion die head capable of changing colors quickly, which comprises a wall thickness control assembly, a feeding assembly and a die body assembly, the wall thickness control assembly is arranged above the die body assembly, the die body assembly comprises a die core, a core rod and a mouth die, the mouth die is arranged at the bottom of the die core, the core rod is arranged in the die core, a lifting end of the wall thickness control assembly is connected with the core rod, and a lifting end of the feeding assembly is connected with the mouth die. A plurality of sets of runner structures distributed in the circumferential direction are formed in the mold core, the feeding assembly communicates with the head ends of the multiple sets of runner structures, the tail ends of the multiple sets of runner structures communicate with the mouth mold, and the runner structures are of inverted-Y-shaped structures. The inverted-Y-shaped runner structure is arranged in the mold core, so that the flowing paths and changes of raw materials are increased, residual raw materials can be washed away by new raw materials more easily, and the phenomenon of color deviation is avoided; and compared with a complex runner, residual old raw materials can be discharged more quickly, so that the time required by color changing is greatly shortened, the production efficiency is improved, and the production pause caused by color changing is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to extrusion blow molding equipment technical field especially relates to a multilayer extrusion die head of quick color change. BACKGROUND

[0002] In the plastic processing industry, extrusion blow molding process is widely used in the production of plastic products of various shapes and sizes. Its production process is to extrude the molten plastic through the extrusion die head, and then blow molding into the product of the required shape. The extrusion die head of the traditional extrusion blow molding machine usually adopts a straight line type runner structure, the raw material enters from the storage cavity, and is directly extruded through the material pressing device and the extrusion die. Although this runner structure is simple, in actual application, due to the limited flow guiding effect of the straight line type runner on the raw material, when the color of the plastic product needs to be switched, the residual raw material in the straight line type runner is difficult to drain, which leads to the mixing of the residual raw material with the new raw material, and further leads to the color deviation of the product.

[0003] In order to solve the problem of color deviation after color change, some manufacturers begin to try to improve the flow guiding effect of the raw material by designing more complex die head runner. By setting the complex runner to increase the tortuosity and change of the runner structure, the discharge of the residual raw material is promoted, so as to reduce the color pollution when the new and old raw materials are replaced. However, this way can improve the efficiency of raw material discharge to some extent, but the residual raw material in the complex runner is difficult to discharge in a short time, generally needs 2-3 hours, which has a great impact on the production efficiency. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a multilayer extrusion die head of quick color change to solve one or more technical problems existing in the above background technical.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A multilayer extrusion die head of quick color change, including wall thickness control assembly, feeding assembly and die body assembly, the wall thickness control assembly is established in the top of the die body assembly, the die body assembly includes die core, core rod and die orifice, the die orifice is established in the bottom of the die core, the core rod is established in the die core, the lifting end of the wall thickness control assembly is connected with the core rod, the die core is opened in the circumferentially distributed multiple groups of runner structure, the feeding assembly is communicated with the first end of multiple groups of the runner structure, the tail end of multiple groups of the runner structure is communicated with the die orifice, and the runner structure is inverted Y-shaped structure.

[0007] Preferably, the flow channel structure comprises a vertically arranged main flow channel and two obliquely arranged sub-flow channels, the first ends of the two sub-flow channels are connected with the end of the main flow channel, and the two sub-flow channels extend along the left and right sides of the main flow channel to form an inverted Y-shaped structure, and the ends of the sub-flow channels are connected with the ends of the adjacent sub-flow channels.

[0008] Preferably, the mold core comprises a feeding top cover, an inner layer flow channel sleeve, at least one middle layer flow channel sleeve, an outer layer flow channel sleeve, and a mold body outer layer, the inner layer flow channel sleeve is fixed at the bottom of the feeding top cover, the middle layer flow channel sleeve is sleeved outside the inner layer flow channel sleeve, the outer layer flow channel sleeve is sleeved outside the middle layer flow channel sleeve, and the mold body outer layer is arranged outside the outer layer flow channel sleeve, the outer sides of the inner layer flow channel sleeve, the middle layer flow channel sleeve, and the outer layer flow channel sleeve are provided with the flow channel structure, and the feeding top cover is provided with a plurality of feeding ports in communication with the feeding assembly, and the feeding ports are connected with the first ends of the flow channel structure.

[0009] Preferably, the mold body assembly further comprises a mesh wire heating ring, and the mesh wire heating ring covers the outside of the mold body outer layer.

[0010] Preferably, the feeding assembly comprises a main feeding connector and a secondary feeding connector, the main feeding connector and the secondary feeding connector are arranged on one side of the mold body assembly, the main feeding connector is in communication with the flow channel structure of the middle layer flow channel sleeve, and the secondary feeding connector is in communication with the flow channel structures of the inner layer flow channel sleeve and the outer layer flow channel sleeve.

[0011] Preferably, the mold body assembly further comprises a mesh wire heating ring, and the mesh wire heating ring covers the outside of the mold body outer layer.

[0012] Preferably, the feeding assembly comprises a main feeding connector and a secondary feeding connector, the main feeding connector and the secondary feeding connector are arranged on one side of the mold body assembly, the main feeding connector is in communication with the flow channel structure of the middle layer flow channel sleeve, and the secondary feeding connector is in communication with the flow channel structures of the inner layer flow channel sleeve and the outer layer flow channel sleeve.

[0013] Preferably, the feeding assembly comprises a main feeding connector and a secondary feeding connector, the main feeding connector and the secondary feeding connector are arranged on one side of the mold body assembly, the main feeding connector is in communication with the flow channel structure of the middle layer flow channel sleeve, and the secondary feeding connector is in communication with the flow channel structures of the inner layer flow channel sleeve and the outer layer flow channel sleeve.

[0014] Preferably, the transparent line assembly is arranged on one side of the mold core and communicates with the middle and lower part of the mold core.

[0015] Compared with the prior art, the beneficial effects of the utility model are that: by arranging the inverted Y-shaped flow channel structure in the mold core, compared with the traditional straight-line flow channel, the inverted Y-shaped flow channel structure increases the flow path and change of raw materials, so that the residual raw materials are more easily flushed clean by new raw materials, avoiding the phenomenon of color deviation; compared with the complex flow channel, the residual old raw materials can be discharged more quickly, thereby greatly shortening the time required for color change, improving the production efficiency and reducing the production downtime caused by color change. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings further illustrate the utility model, but the contents in the drawings do not constitute any limitation on the utility model.

[0017] Figure 1 It is the overall structure schematic diagram of one embodiment of the utility model;

[0018] Figure 2 It is the internal structure schematic diagram of the mold body assembly of one embodiment of the utility model;

[0019] Figure 3 It is the structure schematic diagram of the inner layer flow channel sleeve of one embodiment of the utility model;

[0020] Figure 4 It is the structure schematic diagram of the middle layer flow channel sleeve of one embodiment of the utility model;

[0021] Figure 5 It is the structure schematic diagram of the outer layer flow channel sleeve of one embodiment of the utility model;

[0022] Figure 6 It is the structure schematic diagram of the main regulating valve of one embodiment of the utility model;

[0023] Figure 7 It is the structure schematic diagram of the auxiliary regulating valve of one embodiment of the utility model.

[0024] Wherein: 1, wall thickness control assembly; 2, feeding assembly; 3, die body assembly; 31, die core; 32, core rod; 33, die orifice; 3121, inner layer runner structure; 3131, middle layer runner structure; 3141, outer layer runner structure; 3122, main runner; 3123, branch runner; 311, feeding top cover; 312, inner layer runner sleeve; 313, middle layer runner sleeve; 314, outer layer runner sleeve; 315, die body outer layer; 3111, feeding port; 316, wire heating ring; 21, main feeding connector; 22, auxiliary feeding connector; 4, flow distribution assembly; 41, flow distribution body; 411, main feeding channel; 412, auxiliary feeding channel; 42, main regulating valve; 43, auxiliary regulating valve; 421, main regulating rod; 431, auxiliary regulating rod; 44, heating plate; 5, transparent wire assembly. DETAILED DESCRIPTION

[0025] The technical scheme of the utility model will be further illustrated below in combination with the drawings and through specific embodiments.

[0026] The multi-layer extrusion die of the embodiment can realize fast color changing, and the die core 31, the core rod 32 and the die orifice 33 are arranged in the die body assembly 3. Figure 1 , 2 The wall thickness control assembly 1 is arranged above the die body assembly 3, the die body assembly 3 comprises the die core 31, the core rod 32 and the die orifice 33, the die orifice 33 is arranged at the bottom of the die core 31, the core rod 32 is arranged in the die core 31, the lifting end of the wall thickness control assembly 1 is connected with the core rod 32, a plurality of groups of runner structures are arranged in the die core 31 in a circumferential direction, the feeding assembly 2 is communicated with the first ends of the groups of runner structures, the last ends of the groups of runner structures are communicated with the die orifice 33, and the runner structure is in a reverse Y shape.

[0027] Compared with the traditional linear runner, the reverse Y-shaped runner structure increases the flow path and changes of the raw material, so that the residual raw material is more easily flushed clean by the new raw material, and the color deviation phenomenon is avoided; compared with the complex runner, the residual old raw material can be discharged more quickly, so that the time required for color changing is greatly shortened, the production efficiency is improved, and the production stop caused by color changing is reduced. In the actual color changing process, the color changing time is shortened to 30 minutes, there is no residual color in the material blank convergence part, and there is no color mixing; and the extrusion pressures of the material blanks are balanced, so that the lengths of the material blanks are consistent. The wall thickness control assembly 1 is a prior art, which is used for adjusting the position of the core rod 32 according to different production requirements, so as to control the wall thickness of the plastic product.

[0028] Preferably, referring to the accompanying drawings, Figures 3-5The flow channel structure comprises a vertically arranged main flow channel 3122 and two obliquely arranged branch flow channels 3123. The first ends of the two branch flow channels 3123 are connected to the end of the main flow channel 3122, and the branch flow channels 3123 extend along the left and right sides of the main flow channel 3122 to form an inverted Y-shaped structure. The ends of the branch flow channels 3123 are connected to the ends of adjacent branch flow channels 3123.

[0029] The vertically linear main flow channel 3122 ensures stable flow of the raw material when the raw material enters the mold assembly 3 from the feeding assembly 2, reduces the complexity of the flow channel structure, and shortens the time for removing the residual raw material during color changing. The two obliquely arranged branch flow channels 3123 are connected to the end of the main flow channel 3122 and extend along the left and right sides to form an inverted Y-shaped structure, which increases the tortuosity of the flow channel and promotes the discharge of residual raw material. Thus, the inverted Y-shaped flow channel structure formed by the connection of the main flow channel 3122 and the two branch flow channels 3123 can make the old raw material be flushed out of the flow channel by the new raw material more quickly, greatly shortening the time required for color changing.

[0030] Preferably, the mold core 31 comprises a feeding top cover 311, an inner layer flow channel sleeve 312, at least one middle layer flow channel sleeve 313, an outer layer flow channel sleeve 314, and a mold body outer layer 315. The inner layer flow channel sleeve 312 is fixed at the bottom of the feeding top cover 311. The middle layer flow channel sleeve 313 is sleeved outside the inner layer flow channel sleeve 312. The outer layer flow channel sleeve 314 is sleeved outside the middle layer flow channel sleeve 313. The mold body outer layer 315 is arranged outside the outer layer flow channel sleeve 314. The outer sides of the inner layer flow channel sleeve 312, the middle layer flow channel sleeve 313, and the outer layer flow channel sleeve 314 are provided with flow channel structures. The feeding top cover 311 is provided with a plurality of feeding ports 3111 which are connected to the feeding assembly 2. The feeding ports 3111 are connected to the first ends of the flow channel structures.

[0031] The inner layer flow channel structure 3121 is formed between the inner layer flow channel sleeve 312 and the middle layer flow channel sleeve 313. The middle layer flow channel structure 3131 is formed between the middle layer flow channel sleeve 313 and the outer layer flow channel sleeve 314 or between two middle layer flow channel sleeves 313. The outer layer flow channel structure 3141 is formed between the outer layer flow channel sleeve 314 and the mold body outer layer 315. Thus, the extrusion die of the embodiment can be used for the extrusion of plastic products with a multi-layer structure. The inner and outer layers of the extruded product can have different colors to meet different production requirements. The inner layer flow channel structure 3121, the middle layer flow channel structure 3131, and the outer layer flow channel structure 3141 are all inverted Y-shaped structures, which make the color changing of each layer faster. The switching from red, blue, and black raw materials to the original color material can be realized within 30 minutes. By arranging the feeding top cover 311 with a plurality of feeding ports 3111, the feeding ports 3111 are connected to the corresponding flow channel structures, which facilitates the introduction of raw materials into the mold core 31.

[0032] Preferably, the mold body assembly 3 further comprises a mesh heating ring 316 covering the outside of the mold body outer layer 315. By covering the mesh heating ring 316 on the outside of the mold body outer layer 315, uniform and stable heating of the flow channel sleeve of each layer of the mold core 31 and the mold body outer layer 315 can be ensured, ensuring smooth flow of the raw materials in the flow channel structure and avoiding problems such as solidification or poor flow of the raw materials caused by uneven temperature.

[0033] Preferably, the feeding assembly 2 comprises a main feeding joint 21 and a secondary feeding joint 22, which are arranged on one side of the mold body assembly 3. The main feeding joint 21 is in communication with the flow channel structure of the middle layer flow channel sleeve 313, and the secondary feeding joint 22 is in communication with the flow channel structure of the inner layer flow channel sleeve 312 and the outer layer flow channel sleeve 314.

[0034] By arranging the main feeding joint 21 and the secondary feeding joint 22, two independent feeding channels are provided for the mold core 31. The main feeding joint is in communication with the middle layer flow channel structure 3131, and the secondary feeding joint 22 is in communication with the inner layer flow channel structure 3121 and the outer layer flow channel structure 3141, so that the feeding of the middle layer and the inner and outer layers of the plastic product is independent. During production, the raw materials for forming the middle layer are added through the main feeding joint 21, and the raw materials for forming the inner and outer layers are added through the secondary feeding joint 22. Therefore, different colored raw materials can be added to form products with different colors in the middle layer and the inner and outer layers, thereby meeting the production needs of different plastic products.

[0035] Preferably, with reference to the accompanying drawings Figure 6 and 7 The feeding assembly 2 further comprises a flow distribution assembly 4 arranged between the wall thickness control assembly 1 and the mold body assembly 3. The flow distribution assembly 4 comprises a flow distribution body 41, the main feeding joint 21 and the secondary feeding joint 22 are fixed on one side of the flow distribution body 41, the flow distribution body 41 is provided with a main feeding channel 411 and a secondary feeding channel 412, the main feeding joint 21 is in communication with the main feeding channel 411, the main feeding channel 411 is in communication with the flow channel structure of the middle layer flow channel sleeve 313, the secondary feeding joint 22 is in communication with the secondary feeding channel 412, and the secondary feeding channel 412 is in communication with the flow channel structure of the inner layer flow channel sleeve 312 and the outer layer flow channel sleeve 314.

[0036] By arranging the flow distribution assembly 4, the raw materials of the main feeding joint 21 and the secondary feeding joint 22 are distributed, and the raw materials entering from the main feeding joint 21 and the secondary feeding joint 22 are guided to flow uniformly to the flow channel structure in the corresponding flow channel sleeve, thereby realizing the production of plastic products with multiple layers and different colors in the inner and outer layers and the middle layer.

[0037] Preferably, the flow distribution assembly 4 further comprises a plurality of primary regulating valves 42 and a plurality of secondary regulating valves 43, the primary regulating valves 42 and the secondary regulating valves 43 are arranged on the other side of the flow distribution body 41, the regulating end of the primary regulating valve 42 is connected with a primary regulating rod 421, the primary regulating rod 421 extends into the primary feeding channel 411, the regulating end of the secondary regulating valve 43 is connected with a secondary regulating rod 431, the secondary regulating rod 431 extends into the secondary feeding channel 412.

[0038] By arranging the primary regulating valves 42 and the secondary regulating valves 43, the regulating of the raw material entering flow in the primary feeding channel 411 and the secondary feeding channel 412 is realized, and the requirement of the raw material distribution and flow of the complex plastic product is met. The primary regulating rod 421 of the primary regulating valve 42 and the secondary regulating rod 431 connected with the secondary regulating valve 43 respectively extend into the primary feeding channel 411 and the secondary feeding channel 412, and the regulating of the extending amount of the primary regulating rod 421 and the secondary regulating rod 431 by the primary regulating valve 42 and the secondary regulating valve 43 is realized, so that the regulating of the raw material entering flow in the primary feeding channel 411 and the secondary feeding channel 412 is realized.

[0039] Preferably, the flow distribution assembly 4 further comprises a heating plate 44, the heating plate 44 covers the outer side of the flow distribution body 41. By arranging the heating plate 44 covering the outer side of the flow distribution body 41, the high-temperature environment is provided for the raw material in the flow distribution body 41, and the proper fluidity of the raw material in the flow distribution process is ensured, and the problem of raw material solidification or poor flow caused by too low temperature is avoided.

[0040] Preferably, the transparent line assembly is further arranged on one side of the mold core 31, and the transparent line assembly is in communication with the middle and lower part of the mold core 31. The transparent line assembly is prior art, and the transparent line assembly is arranged in the embodiment to form the transparent visual liquid level line on the molded plastic product, and the production requirement of different products is met.

[0041] The technical principles of the utility model are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the utility model, and cannot be explained as the limitation of the protection scope of the utility model in any way. Based on the explanation herein, the other specific embodiments of the utility model can be thought of by the person skilled in the art without creative labor, and these embodiments will fall into the protection scope of the utility model.

Claims

1. A multi-layered extrusion die capable of fast color change, characterized in that, The wall thickness control assembly, the feeding assembly and the die assembly are provided, the wall thickness control assembly is arranged above the die assembly, the die assembly comprises a die core, a core rod and a die head, the die head is arranged at the bottom of the die core, the core rod is arranged in the die core, the lifting end of the wall thickness control assembly is connected with the core rod, a plurality of groups of flow channel structures are arranged in the die core in a circumferential direction, the feeding assembly is communicated with the first ends of the plurality of groups of flow channel structures, the last ends of the plurality of groups of flow channel structures are communicated with the die head, and the flow channel structure is a reverse Y-shaped structure.

2. The multi-layer extrusion die according to claim 1, wherein, the flow channel structure comprises a vertical main flow channel and two inclined branch flow channels, the first ends of the two branch flow channels are connected with the last end of the main flow channel, and the branch flow channels extend along the left and right sides of the main flow channel to form a reverse Y-shaped structure, and the last ends of the branch flow channels are connected with the last ends of the adjacent branch flow channels.

3. A multi-layered extrusion die for rapid color change according to claim 2, wherein the die core comprises a feeding top cover, an inner layer flow channel sleeve, at least one middle layer flow channel sleeve, an outer layer flow channel sleeve and a die outer layer, the inner layer flow channel sleeve is fixed at the bottom of the feeding top cover, the middle layer flow channel sleeve is sleeved outside the inner layer flow channel sleeve, the outer layer flow channel sleeve is sleeved outside the middle layer flow channel sleeve, the die outer layer is arranged outside the outer layer flow channel sleeve, the outer sides of the inner layer flow channel sleeve, the middle layer flow channel sleeve and the outer layer flow channel sleeve are provided with the flow channel structures, a plurality of feeding ports are arranged on the feeding top cover and communicated with the feeding assembly, and the feeding ports are connected with the first ends of the flow channel structures.

4. A multi-layered extrusion die for rapid color change according to claim 3, wherein the die assembly further comprises a mesh wire heating ring, and the mesh wire heating ring covers the outside of the die outer layer.

5. A multi-layered extrusion die for rapid color change according to claim 3, wherein the feeding assembly comprises a main feeding connector and a secondary feeding connector, the main feeding connector and the secondary feeding connector are arranged on one side of the die assembly, the main feeding connector is communicated with the flow channel structures of the middle layer flow channel sleeve, and the secondary feeding connector is communicated with the flow channel structures of the inner layer flow channel sleeve and the outer layer flow channel sleeve.

6. A multi-layered extrusion die for rapid color change according to claim 5, wherein the feeding assembly further comprises a flow distribution assembly, the flow distribution assembly is arranged between the wall thickness control assembly and the die assembly, the flow distribution assembly comprises a flow distribution body, the main feeding connector and the secondary feeding connector are fixed on one side of the flow distribution body, the flow distribution body is provided with a main feeding channel and a secondary feeding channel, the main feeding connector is communicated with the main feeding channel, the main feeding channel is communicated with the flow channel structures of the middle layer flow channel sleeve, the secondary feeding connector is communicated with the secondary feeding channel, and the secondary feeding channel is communicated with the flow channel structures of the inner layer flow channel sleeve and the outer layer flow channel sleeve.

7. A multi-layered extrusion die for rapid color change according to claim 6, wherein the flow distribution assembly further comprises a main adjusting valve and a secondary adjusting valve, the main adjusting valve and the secondary adjusting valve are arranged on the other side of the flow distribution body, the adjusting end of the main adjusting valve is connected with a main adjusting rod, the main adjusting rod extends into the main feeding channel, the adjusting end of the secondary adjusting valve is connected with a secondary adjusting rod, and the secondary adjusting rod extends into the secondary feeding channel.

8. A multi-layered extrusion die for rapid color change according to claim 6, wherein the flow distribution assembly further comprises a heating plate, and the heating plate covers the outside of the flow distribution body.

9. A multi-layered extrusion die for rapid color changing according to claim 3, wherein, Also included is a transparent line assembly provided on one side of the mold core, which communicates with the middle and lower part of the mold core.

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