Extrusion die with temperature adjusting function

Abstract

The utility model relates to the technical field of PVC pipe extrusion dies, and discloses an extrusion die with a temperature adjusting function, the extrusion die comprises a die body, a mouth die and a die core, the die core is arranged in the mouth die, an extrusion channel is formed between the outer wall of the die core and the inner wall of the mouth die, a feeding port is formed in one side of the die body, and a temperature control transition pipe is arranged at the feeding port; a heat exchange cavity is formed in the temperature control transition pipe, the heat exchange cavity is communicated with an external air cooler and provided with ventilation pipes, a control valve is arranged in the ventilation pipe located at the air inlet position on the wall of the temperature control transition pipe, a thermometer is arranged in the ventilation pipe located at the air outlet position on the wall of the temperature control transition pipe, and the thermometer is electrically connected to the control valve. A sizing sleeve is arranged at the discharge hole of the mouth mold in a communicating manner; and a cooling piece is arranged on the sizing sleeve. The forming effect of the mold extrusion forming pipe is improved.

Description

Technical Field

[0001] The present application relates to the technical field of PVC pipe extrusion dies, and in particular to an extrusion die with a temperature regulating function. Background Art

[0002] PVC plastic is a widely used plastic material, a polymer formed by free radical polymerization of vinyl chloride monomer. PVC plastic has the advantages of good chemical corrosion resistance, electrical insulation, mechanical strength, processing performance and low cost, so it has been widely used in construction, wire and cable, packaging, medical equipment, automotive parts and other fields.

[0003] Extrusion molding is generally used for the production of continuous profiles such as thermoplastic pipes, rods, films, wires, etc. It has the characteristics of continuous molding, constant cross-section of plastic parts, balanced and tight internal structure of plastic parts, and strong applicability. The important parameters of the extrusion molding process include temperature. The temperature difference and temperature fluctuation during the extrusion process will affect the quality of the plastic parts and cause residual stress in the plastic parts. Uneven strength at each point will cause the extruded quick-cut surface to be matte.

[0004] A Chinese patent with announcement number CN218519144U discloses a ring groove pressure-equalizing and diverting extrusion PVC hose mold, comprising a mold body, a mouth mold and a mold core, wherein the mold core is arranged in the mouth mold, and an extrusion channel is formed between the outer wall of the mold core and the inner wall of the mouth mold. A feed port is arranged on the mold body, and the mouth mold and the mold core are arranged on the outlet of the mold body. The feed port is connected to the extrusion channel, and a plurality of ring grooves are arranged between the feed port and the extrusion channel to stabilize the pressure.

[0005] The above-mentioned mold has a too short travel distance for the melt provided by the feed channel and the extrusion channel, so it is difficult to reduce the temperature of the plastic part extruded from the discharge port. In addition, the plastic part extruded through this mold is very likely to have an excessively high temperature, and thus cannot resist the deformation due to its own weight. Even due to the excessively high temperature, the extruded plastic part still flows out of the mold discharge port as a melt, which not only affects the shaping effect of the molded tube extruded by the mold, but also reduces the production efficiency. Utility Model Content

[0006] In order to improve the shaping effect of a molded tube extruded by a mold, the present application provides an extrusion mold with a temperature regulating function.

[0007] The present application provides an extrusion die with temperature regulation function adopts the following technical solution:

[0008] An extrusion die with a temperature regulation function comprises a die body, a die and a die core, wherein the die core is arranged in the die, an extrusion channel is formed between the outer wall of the die core and the inner wall of the die, a feed port is arranged on one side of the die body, a temperature control transition pipe is arranged at the feed port, a heat exchange cavity is opened inside the temperature control transition pipe, the heat exchange cavity is connected to an external cooling air blower and a ventilation pipe is arranged, a control valve is arranged in the ventilation pipe at the air inlet on the wall of the temperature control transition pipe, a thermometer is arranged in the ventilation pipe at the air outlet on the wall of the temperature control transition pipe, the thermometer is electrically connected to the control valve, a sizing sleeve is arranged at the outlet of the die, and a cooling element is arranged on the sizing sleeve.

[0009] By adopting the above technical solution, before the plastic melt enters the molding cavity of the mold body, the temperature is first controlled within a suitable range by the temperature control transition pipe, and then it passes through the extrusion channel, and finally, with the assistance of the cooling piece, the plastic part is extruded from the outlet of the sizing sleeve to form a molded plastic part. The staff can set a value for the thermometer according to the ideal molding temperature, and then electrically connect the thermometer to the control valve, so that the control valve can regulate the flow of cold air entering the heat exchange tube, which can well control the molding temperature of the mold, and well cool and shape the plastic part through the sizing sleeve and the cooling piece, thereby improving the shaping effect of the molded tube extruded by the mold.

[0010] Optionally, a plurality of branch channels are provided in the temperature-controlled transition pipe corresponding to the plastic melt, and the plurality of branch channels are connected and arranged to avoid the heat exchange cavity.

[0011] By adopting the above technical solution, the provision of a plurality of branch channels increases the heat exchange area between the plastic melt and the inner wall of the temperature-controlled transition pipe, thereby improving the cooling effect of the temperature-controlled transition pipe.

[0012] Optionally, a filter plate is provided at the feed inlet connecting the temperature-controlled transition pipe and the inner cavity of the mold body.

[0013] By adopting the above technical solution, the setting of the filter plate can not only filter out impurities in the plastic melt, but also increase the flow resistance of the plastic melt, destroy the larger bubbles in the plastic melt caused by vibration, make the plastic melt denser, and further improve the molding effect of the plastic parts.

[0014] Optionally, a butterfly valve is provided in the temperature control transition pipe at a position close to the filter plate.

[0015] By adopting the above technical solution, when the melt flow rate output from the extruder to the feed end of the temperature-controlled transition pipe is constant, the butterfly valve adjusts the flow diameter of the plastic melt entering the mold body, thereby realizing the speed control of the plastic melt entering the mold body.

[0016] Optionally, a cavity is defined in the sizing sleeve, and the cooling element is a cooling water pipe wound in the cavity of the sizing sleeve. The water inlet and outlet ends of the cooling water pipe penetrate the side wall of the sizing sleeve and extend out of the sizing sleeve to communicate with an external cooling circulation system.

[0017] By adopting the above technical solution, a water-cooled heat exchange method is used to provide a cooling effect for the plastic part in the sizing sleeve, thereby accelerating the molding of the plastic part and improving the molding effect of the plastic part.

[0018] Optionally, a diverter is coaxially arranged at one end of the mold core facing the filter plate, and the diameter of the diverter gradually decreases along the direction toward the filter plate.

[0019] By adopting the above technical solution, the diverter head setting helps to disperse the impact pressure of the plastic melt entering the mold cavity and improve the uniformity of plastic parts during extrusion.

[0020] Optionally, a plurality of spiral guide vanes are distributed circumferentially on the flow diverter head, and the plurality of spiral guide vanes abut between the flow diverter head and the inner wall of the mold body.

[0021] By adopting the above technical solution, the spiral of the spiral guide plate increases the flow rate of the plastic melt, and serves as a connection between the mold core and the mold body, and also has the effect of further mixing the plastic melt evenly. In the process of the flow of the plastic melt, the pressure of the plastic melt impacting the diverter head is further dispersed, thereby improving the uniformity of plastic part molding.

[0022] Optionally, an outlet die is extended from one end of the mold core close to the discharge port, and the extension length of the mold core is adapted to the length of the sizing sleeve.

[0023] By adopting the above technical solution, while the sizing sleeve cools and shapes the outer wall of the plastic part, it also supports the inner wall of the plastic part, thereby reducing the possibility of deformation of the inner diameter of the plastic part during the shaping process and further improving the shaping effect of the molded tube extruded by the mold.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Before the plastic melt enters the molding cavity of the mold, the temperature is first controlled within a suitable range through a temperature-controlled transition pipe, and then it passes through the extrusion channel, and finally, with the assistance of the cooling element, it is extruded from the outlet of the sizing sleeve to form a plastic part. The staff can set a value for the thermometer according to the ideal molding temperature, and then electrically connect the thermometer to the control valve, so that the control valve can regulate the flow of cold air entering the heat exchange tube, which can well control the molding temperature of the mold, and the sizing sleeve and cooling element can be used to cool and shape the plastic part well, thereby improving the shaping effect of the molded tube extruded by the mold;

[0026] 2. The setting of several branch channels increases the heat exchange area between the plastic melt and the inner wall of the temperature-controlled transition tube, thereby improving the cooling effect of the temperature-controlled transition tube;

[0027] 3. The setting of the filter plate can not only filter out impurities in the plastic melt, but also increase the flow resistance of the plastic melt, destroy the large bubbles in the plastic melt caused by vibration, make the plastic melt more compact, and further improve the molding effect of the plastic parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Mold body; 11. Feed inlet; 111. Filter plate; 12. Compression chamber; 2. Mouth die; 3. Mold core; 31. Diverter; 311. Spiral guide vane; 4. Temperature control transition pipe; 41. Heat exchange chamber; 42. Diverter; 43. Ventilation pipe; 431. Air inlet pipe; 432. Air outlet pipe; 44. Butterfly valve; 5. Temperature control component; 51. Control valve; 52. Thermometer; 6. Sizing sleeve; 7. Cooling part; 71. Cooling water pipe; 8. Extrusion channel; 9. Shaping channel. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-2 This application is described in further detail.

[0033] The embodiment of the present application discloses an extrusion die with a temperature regulation function.

[0034] Reference Figure 1 and Figure 2 An extrusion die with a temperature regulating function comprises a die body 1, a die mouth 2 and a die core 3. A feed port 11 is provided on one side of the die body 1. A filter plate 111 is fixedly provided at the feed port 11. A temperature control transition pipe 4 is installed at the feed port 11 in communication with the filter plate 111. The temperature control transition pipe 4 is provided with a temperature control component 5. The die mouth 2 is installed in the die body 1 by bolts, and a sizing sleeve 6 is coaxially installed at the discharge port of the die mouth 2. A cooling member 7 is provided on the sizing sleeve 6. The die core 3 is provided in the die mouth 2, and one end of the die core 3 close to the discharge port extends from the die mouth 2 and the extension length is adapted to the length of the sizing sleeve 6. An extrusion channel 8 is formed between the outer wall of the die core 3 and the inner wall of the die mouth 2, and a shaping channel 9 is formed between the outer wall of the die core 3 and the inner wall of the sizing sleeve 6.

[0035] Reference Figure 1 and Figure 2Before the plastic melt enters the molding cavity of the mold body 1, it first passes through the temperature-controlled transition pipe 4, and the temperature of the plastic melt before entering the mold body 1 is controlled within a suitable range by the temperature-controlled component 5, and then enters the mold body 1 after being filtered by the filter plate 111. The plastic melt flows through the extrusion channel 8 in the mold body 1 for compression molding, and finally, with the assistance of the cooling member 7, the molded plastic part is extruded from the discharge port of the molding channel 9.

[0036] Reference Figure 1 and Figure 2 A heat exchange cavity 41 and a plurality of flow diversion channels 42 are provided inside the temperature control transition tube 4. The plurality of flow diversion channels 42 are connected and arranged to avoid the heat exchange cavity 41. A ventilation pipe 43 is connected between the heat exchange cavity 41 and the external air cooler. The ventilation pipe 43 includes an air inlet pipe 431 and an air outlet pipe 432. The air inlet pipe 431 is arranged on the side wall of the temperature control transition tube 4 close to its own feed, and the air outlet pipe 432 is arranged on the side wall of the temperature control transition tube 4 close to the feed port 11. The temperature control component 5 includes a control valve 51 and a thermometer 52. The control valve 51 is fixedly arranged in the air inlet pipe 431, and the thermometer 52 is fixedly arranged at the connection between the air outlet pipe 432 and the temperature control transition tube 4. The thermometer 52 is electrically connected to the control valve 51.

[0037] Reference Figure 1 and Figure 2 A cavity is provided in the sizing sleeve 6. In this embodiment, the cooling member 7 is a cooling water pipe 71. The cooling water pipe 71 is arranged in the cavity of the sizing sleeve 6. The water inlet and outlet ends of the cooling water pipe 71 penetrate the side wall of the sizing sleeve 6 and extend out of the sizing sleeve 6. The water inlet and outlet ends of the cooling water pipe 71 are connected to the external cooling circulation system.

[0038] Reference Figure 2 In order to eliminate the uneven extrusion of plastic parts caused by the accumulation of pressure when the plastic melt enters the extrusion channel 8, the end of the mold core 3 facing the feed inlet 11 of the mold body 1 is coaxially integrally formed with a diverter 31, and the diameter of the diverter 31 gradually decreases along the direction toward the feed inlet 11. At the same time, a number of spiral guide plates 311 are distributed along the circumference of the diverter 31, and the spiral guide plates 311 are abutted between the diverter 31 and the inner wall of the mold body 1. A compression chamber 12 is formed between the diverter 31 and the inner wall of the mold body 1, and the compression chamber 12 is connected to the extrusion channel 8.

[0039] Reference Figure 1 In order to control the flow rate of the plastic melt, a butterfly valve 44 is fixedly connected and arranged at a position near the filter plate 111 in the temperature control transition pipe 4 .

[0040] The implementation principle of an extrusion mold with a temperature regulation function in an embodiment of the present application is as follows: before the plastic melt enters the molding cavity of the mold body 1, it first passes through the temperature-controlled transition pipe 4. The staff can set a value for the thermometer 52 according to the ideal molding temperature, and then the thermometer 52 is electrically connected to the control valve 51, so that the control valve 51 regulates the flow of cold air entering the heat exchange tube, and then enters the mold body 1 after being filtered by the filter plate 111, and the staff can adjust the flow rate of the plastic melt entering the mold body 1 as needed through the butterfly valve 44.

[0041] The plastic melt enters the compression chamber 12 in the mold body 1, hits the diverter head 31 and the guide plate, which can disperse the pressure, and evenly enters the extrusion channel 8 for compression molding. Finally, with the assistance of heat exchange by the cooling water pipe 71, the molded plastic part is extruded from the outlet of the molding channel 9.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An extrusion die with a temperature regulating function, comprising a die body (1), a die (2) and a die core (3), characterized in that: The mold core (3) is arranged in the die (2), and an extrusion channel (8) is formed between the outer wall of the mold core (3) and the inner wall of the die (2). A feed port (11) is arranged on one side of the mold body (1), and a temperature control transition pipe (4) is arranged at the feed port (11), and a heat exchange cavity (41) is opened inside the temperature control transition pipe (4), and the heat exchange cavity (41) is connected to an external cooling air machine and is provided with a ventilation pipe (43), a control valve (51) is arranged in the ventilation pipe (43) at the air inlet on the wall of the temperature control transition pipe (4), and a thermometer (52) is arranged in the ventilation pipe (43) at the air outlet on the wall of the temperature control transition pipe (4), and the thermometer (52) is electrically connected to the control valve (51), and a sizing sleeve (6) is arranged at the discharge port of the die (2), and a cooling element (7) is arranged on the sizing sleeve (6).

2. The extrusion die with temperature regulation function according to claim 1, characterized in that: A plurality of branch channels (42) are provided in the temperature-controlled transition pipe (4) corresponding to the plastic melt, and the plurality of branch channels (42) are connected and arranged to avoid the heat exchange cavity (41).

3. The extrusion die with temperature regulation function according to claim 1, characterized in that: A filter plate (111) is provided at the feed inlet (11) connecting the temperature-controlled transition pipe (4) and the inner cavity of the mold body (1).

4. The extrusion die with temperature regulation function according to claim 3, characterized in that: A butterfly valve (44) is provided in the temperature control transition pipe (4) at a position close to the filter plate (111).

5. The extrusion die with temperature regulation function according to claim 1, characterized in that: A cavity is provided in the sizing sleeve (6), and the cooling element (7) is a cooling water pipe (71) wound in the cavity of the sizing sleeve (6). The water inlet and outlet ends of the cooling water pipe (71) penetrate the side wall of the sizing sleeve (6) and extend out of the sizing sleeve (6) to communicate with an external cooling circulation system.

6. The extrusion die with temperature regulation function according to claim 1, characterized in that: A flow divider (31) is coaxially arranged at one end of the mold core (3) facing the filter plate (111), and the diameter of the flow divider (31) gradually decreases in a direction toward the filter plate (111).

7. The extrusion die with temperature regulation function according to claim 6, characterized in that: A plurality of spiral guide vanes (311) are distributed on the flow splitter (31) along the circumferential direction, and the plurality of spiral guide vanes (311) are in contact between the flow splitter (31) and the inner wall of the mold body (1).

8. The extrusion die with temperature regulation function according to claim 1, characterized in that: The outlet die (2) is extended from one end of the die core (3) close to the discharge port, and the extension length of the die core (3) is adapted to the length of the sizing sleeve (6).

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