Plastic particle forming mold

Abstract

The utility model relates to a plastic particle forming die. The plastic particle forming die comprises an extrusion die and a heating assembly. The extrusion die comprises a first part and a second part in the flowing direction of the plastic melt, and the first part and the second part are integrally formed; a feeding channel is formed in the first part, a plurality of die holes are formed in the second part, and the die holes communicate with the feeding channel. And the heating assembly is arranged on the periphery of the second part in a sleeving mode, abuts against the second part and is used for heating the first part and the plastic melt in the mold hole. According to the plastic granulator, when liquid plastic in a molten state is extruded out of the mold hole, the heating assembly heats the second part of the extrusion mold, so that the influence of a cooling assembly in the plastic granulator on the second part is reduced; therefore, the second part and the plastic in the die hole are kept at a high temperature, so that the liquid plastic can be extruded out of the die hole conveniently.

Description

Technical Field

[0001] This application relates to the technical field of plastic granulators, and in particular to a plastic particle forming die. Background Art

[0002] A plastic granulator is a mechanical device that converts plastic raw materials into granular products through a series of technological processes such as heating, melting, extrusion, and cutting.

[0003] The working principle of a plastic granulator is as follows: Plastic raw materials are fed into the heating cylinder of the granulator. Under the rotation of the screw and the action of the heating element, the plastic gradually melts and reaches a temperature and viscosity suitable for extrusion. The molten plastic is pushed towards the extrusion head under the rotation and shearing action of the screw. The head of the plastic granulator is provided with a forming die, and several die holes are provided on the forming die; the molten plastic is extruded through the die holes of the forming die to form a continuous and uniform plastic strip.

[0004] In the prior art, a cutting assembly can be directly installed at the end of the forming die, and a cooling assembly (water cooling assembly or air cooling assembly) is provided between the switching assembly and the forming die, so as to use the cooling assembly to cool the plastic strip extruded from the forming die, making the plastic change from a liquid state to a solid state; subsequently, the cutting assembly directly cuts the plastic strip into plastic particles to reduce the floor area of the equipment and produce plastic particles with regular shapes and smooth surfaces.

[0005] However, in addition to cooling the extruded plastic strip, the cooling assembly will also cool the forming die and transfer the influence to the plastic in a molten state in the die holes; thus causing the plastic melt to cool and harden in advance, affecting the extrusion of the plastic melt. Utility Model Content

[0006] In order to reduce the influence of the cooling assembly on the forming die in a plastic granulator so as to facilitate the extrusion of the plastic melt from the forming die, this application provides a plastic particle forming die.

[0007] A plastic particle forming die provided by this application adopts the following technical solutions:

[0008] A plastic particle forming die includes an extrusion die and a heating assembly; along the flow direction of the plastic melt, the extrusion die includes a first component and a second component, and the first component and the second component are integrally formed; a feeding channel is opened inside the first component, and several die holes are opened in the second component, and the several die holes are communicated with the feeding channel; the heating assembly is sleeved on the outer periphery of the second component, and the heating assembly abuts against the second component, and the heating assembly is used to heat the first component and the plastic melt in the die holes.

[0009] By adopting the above technical solution, when the liquid plastic in a molten state is extruded from the die hole, the heating component heats the second component of the extrusion die to reduce the influence of the cooling component in the plastic granulator on the second component; thereby enabling the second component and the plastic in the die hole to maintain a relatively high temperature, facilitating the extrusion of the liquid plastic from the die hole, and improving the production quality and production efficiency of plastic particles.

[0010] Optionally, the heating component includes a housing, a heating element, and a first connecting wire. The housing is fixedly connected to the extrusion die, and the housing is in contact with the outer periphery of the second component. The housing is provided with a receiving cavity for receiving the heating element. The housing is provided with a first mounting hole for the first connecting wire to pass through. One end of the first connecting wire passes through the mounting hole and is connected to the heating element, and the other end of the first connecting wire is connected to a power supply device.

[0011] By adopting the above technical solution, the temperature of the housing is increased by the heating element, and the heat is transferred to the second component of the extrusion die through the housing to maintain the temperature of the second component and the liquid plastic in the die hole.

[0012] Optionally, the heating component further includes a temperature sensor. The temperature sensor includes a temperature probe and a second connecting wire connected to each other. The housing is provided with a second mounting hole for installing the temperature probe. The end of the temperature probe extends into the receiving cavity. The temperature probe is used to collect the temperature in the receiving cavity. One end of the second connecting wire is connected to the temperature probe, and the other end of the second connecting wire is connected to a background terminal controller.

[0013] By adopting the above technical solution, the temperature of the heating component is detected by the temperature sensor, thereby controlling the power of the heating element.

[0014] Optionally, the forming die further includes a fastener, and there are two heating components. The two heating components are arranged oppositely. The two heating components enclose a through hole for installing the extrusion die. The ends of the two heating components are connected by a fastener, and the fastener is used to force the heating component to be in contact with the extrusion die.

[0015] By adopting the above technical solution, the two heating components are fixed by the fastener, thereby improving the degree of contact between the heating component and the extrusion die, facilitating the transfer of heat from the heating component to the extrusion die, and maintaining the temperature of the second component and the liquid plastic in the die hole.

[0016] Optionally, the fastener includes a fastening bolt and a fastening nut. Both ends of the heating component are provided with connecting ear plates. The connecting ear plates are provided with third mounting holes for the fastening bolt to pass through. The fastening bolt passes through the two third mounting holes and is threadedly connected to the fastening nut.

[0017] By adopting the above technical solution, two heating components are fixed by fastening bolts and fastening nuts, which is convenient for the staff to operate.

[0018] Optionally, the forming die further includes a flexible heat-conducting pad, and the heat-conducting pad is disposed between the heating component and the extrusion die.

[0019] By adopting the above technical solution, by arranging a flexible heat-conducting pad between the heating component and the extrusion die, the gap between the heating component and the extrusion die can be reduced; when heat is transferred from the heating component to the extrusion die, the heat transfer efficiency can be improved to maintain the temperature of the extrusion die.

[0020] Optionally, the heat-conducting pad is a synthetic graphite heat-conducting film.

[0021] By adopting the above technical solution, the synthetic graphite heat-conducting film is placed between the heating component and the extrusion die to facilitate the transfer of heat between the heating component and the extrusion die.

[0022] Optionally, an avoidance gap is provided at the end of the heating component and the second component.

[0023] By adopting the above technical solution, an avoidance gap is provided at the end of the heating component and the second component to reduce the influence of the heating component on the cooling component and the switching component.

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

[0025] 1. When the liquid plastic in a molten state is extruded from the die hole, the heating component heats the second component of the extrusion die to reduce the influence of the cooling component in the plastic granulator on the second component; thereby enabling the second component and the plastic in the die hole to maintain a relatively high temperature, facilitating the extrusion of the liquid plastic from the die hole, and improving the production quality and production efficiency of plastic particles;

[0026] 2. The temperature of the heating component is detected by a temperature sensor to control the power of the heating element; reducing the occurrence of situations where the heating component is not heated sufficiently or is overheated;

[0027] 3. Two heating components are fixed by fasteners, thereby improving the degree of fit between the heating component and the extrusion die, facilitating the transfer of heat from the heating component to the extrusion die, and maintaining the temperature of the second component and the liquid plastic in the die hole. Description of the Drawings

[0028] Figure 1 It is a schematic diagram showing the structure of the forming die in Embodiment 1.

[0029] Figure 2 It is a cross-sectional view showing the structure of the molding die in Embodiment 1 of the present invention.

[0030] Figure 3 It is a schematic diagram showing the structure of the heating assembly in Embodiment 1 of the present invention.

[0031] Figure 4 It is a schematic diagram showing the structure of the molding die in Embodiment 2 of the present invention.

[0032] Figure 5 It is Figure 4 an enlarged view of part A in

[0033] Explanation of reference numerals: 1. Extrusion die; 11. First component; 111. Feed channel; 12. Second component; 121. Die hole; 2. Heating assembly; 21. Housing; 211. Accommodation cavity; 212. First mounting hole; 213. Second mounting hole; 22. Heating element; 23. First connecting wire; 24. Temperature sensor; 241. Temperature probe; 242. Second connecting wire; 3. Connecting ear plate; 31. Third mounting hole; 4. Fastening bolt; 5. Heat-conducting backing plate. Detailed implementation manners

[0034] The following further elaborates on the present application Figures 1-5 in conjunction with the attached drawings.

[0035] Embodiment 1

[0036] An embodiment of the present application discloses a plastic particle molding die. Referring to Figure 1 and Figure 2 , the plastic particle molding die includes an extrusion die 1 and a heating assembly 2; the heating assembly 2 is fixedly arranged on the outer periphery of the extrusion die 1, and the heating assembly 2 is used for heating the extrusion die 1.

[0037] Referring to Figure 1 and Figure 2 , the extrusion die 1 is arranged at the end of the heating cylinder of the plastic granulator. Along the flow direction of the plastic melt, the extrusion die 1 includes a first component 11 and a second component 12, and the first component 11 and the second component 12 are integrally formed; a feed channel 111 is formed inside the first component 11, and a plurality of die holes 121 are formed in the second component 12, and the plurality of die holes 121 are communicated with the feed channel 111; thus, under the pressure inside the plastic granulator, the molten liquid plastic is extruded from the molding die to form plastic strips.

[0038] Referring to Figure 1 and Figure 2 , in this embodiment, the extrusion die 1 is horizontally arranged, and the extrusion die 1 is in a stepped shape. The cross-sectional area of the first component 11 is larger than the cross-sectional area of the second component 12, and the cross-section of the second component 12 is circular. The plurality of film holes are circumferentially distributed.

[0039] In the prior art, a cutting assembly is directly installed at the end of a plastic granulator, and a cooling assembly (water cooling assembly or air cooling assembly) is arranged between the switching assembly and the forming die, so as to cool the plastic strip extruded from the forming die by means of the cooling assembly, and make the plastic change from a liquid state to a solid state; subsequently, the cutting assembly directly cuts the plastic strip into plastic particles, so as to reduce the floor area of the equipment and produce plastic particles with regular shapes and smooth surfaces.

[0040] However, in addition to cooling the extruded plastic strip, the cooling assembly will also cool the forming die and transfer the influence to the plastic in a molten state in the die hole 121; thus, the plastic melt is cooled and hardened in advance, affecting the extrusion of the plastic melt.

[0041] Refer to Figure 1 and Figure 2 Therefore, the heating assembly 2 is fixedly arranged on the outer periphery of the extrusion die 1, and the heating assembly 2 is used for heating the extrusion die 1. Specifically, the heating assembly 2 is sleeved on the outer periphery of the second component 12, and the heating assembly 2 is in contact with the second component 12. The heating assembly 2 is used for heating the first component 11 and the plastic melt in the die hole 121. And an avoidance gap is provided between the heating assembly 2 and the end of the second component 12 to reduce the influence of the heating assembly 2 on the cooling assembly and the switching assembly.

[0042] Refer to Figure 2 and Figure 3 The heating assembly 2 includes a housing 21, a heating element 22, a first connecting wire 23 and a temperature sensor 24.

[0043] Refer to Figure 2 and Figure 3 In this embodiment, the housing 21 is circular, the housing 21 is directly sleeved on the outer periphery of the second component 12 of the extrusion die 1, and an avoidance gap is provided between the housing 21 and the outer periphery of the second component 12. At the same time, the inner peripheral wall of the housing 21 is attached to the outer periphery of the second component 12.

[0044] Refer to Figure 2 and Figure 3, on the side of the housing 21 close to the first component 11, there is a receiving cavity 211, and the housing 21 is bolted to the first component 11, and the housing 21 is in contact with the first component 11. The receiving cavity 211 is used to accommodate the heating element 22. In this embodiment, the heating element 22 is installed on the inner peripheral wall of the housing 21, and the heating element 22 is an electric heating wire. The housing 21 is provided with a first mounting hole 212 for the first connecting wire 23 to pass through. One end of the first connecting wire 23 passes through the mounting hole and is connected to the heating element 22, and the first connecting member is hermetically connected to the second mounting hole 213 through a metal member. The other end of the first connecting wire 23 is connected to the power supply device. The hermetic connection between the metal member and the second mounting hole 213 can be a threaded connection. Thus, the temperature of the housing 21 can be increased by the heating element 22, and the heat can be transferred from the housing 21 to the second component 12 of the extrusion die 1 to maintain the temperature of the second component 12 and the liquid plastic in the die hole 121.

[0045] Refer to Figure 2 and Figure 3 , the temperature sensor 24 includes a temperature probe 241 and a second connecting wire 242 connected to each other. The housing 21 is provided with a hole side wall of the second mounting hole 213 for the temperature probe 241 to pass through via a metal connecting member. The end of the temperature probe 241 extends into the receiving cavity 211. The temperature probe 241 is used to collect the temperature in the receiving cavity 211. One end of the second connecting wire 242 is connected to the temperature probe 241, and the other end of the second connecting wire 242 is connected to the background terminal controller. The temperature of the heating assembly 2 is detected by the temperature sensor 24, so as to control the power of the heating element 22; reduce the situation that the heating of the heating assembly 2 is insufficient or overheating occurs.

[0046] The implementation principle of a plastic pellet forming die in an embodiment of the present application is as follows:

[0047] Refer to Figure 2 and Figure 3 , when the liquid plastic in a molten state is extruded from the die hole 121, the heating assembly 2 heats the second component 12 of the extrusion die 1 to reduce the influence of the cooling assembly in the plastic granulator on the second component 12; so that both the second component 12 and the plastic in the die hole 121 maintain a relatively high temperature, facilitating the extrusion of the liquid plastic from the die hole 121 and improving the production quality and production efficiency of plastic pellets.

[0048] Embodiment 2

[0049] The difference between this Embodiment 2 and Embodiment 1 is:

[0050] In Embodiment 1, to make the heating component 2 fit the outer periphery of the extrusion die 1, there are relatively high machining precision requirements for the housing 21 of the heating component 2, and there are also relatively high installation precision requirements for the installation of the heating component 2. Therefore, the present application makes further settings for the heating component 2 to facilitate the processing and installation of the heating component 2 by the staff.

[0051] Referring to Figure 4 and Figure 5 , in this embodiment, there are two heating components 2, and the heating component 2 is in a semicircular shape. The two heating components 2 enclose a through hole for installing the extrusion die 1; both ends of the heating component 2 are provided with connecting ear plates 3, and the connecting ear plates 3 are provided with third mounting holes 31.

[0052] Referring to Figure 4 and Figure 5 , in addition, the forming die further includes a fastener and a flexible heat-conducting cushion plate 5. The two heating components 2 are arranged oppositely, and the ends of the two heating components 2 are connected by the fastener. The fastener is used to force the heating component 2 to fit the extrusion die 1; to improve the degree of fit between the heating component 2 and the extrusion die 1, so as to facilitate the heat to be transferred from the heating component 2 to the extrusion die 1 and maintain the temperature of the liquid plastic in the second component 12 and the die hole 121.

[0053] Referring to Figure 4 and Figure 5 , in this embodiment, the fastener includes a fastening bolt 4 and a fastening nut (the fastening nut is not shown in the figure due to the viewing angle). The fastening bolt 4 passes through the two third mounting holes 31 and is threadedly connected to the fastening nut, which is convenient for the staff to operate.

[0054] Referring to Figure 4 and Figure 5 , and the heat-conducting cushion plate 5 is arranged between the heating component 2 and the extrusion die 1. When the fastening bolt 4 is threadedly connected to the fastening nut, the two heating components 2 approach each other to squeeze the heat-conducting cushion plate 5, so as to improve the tightness of the connection between the heating component 2 and the extrusion die 1. The heat-conducting cushion plate 5 can be made of any heat-conducting material such as a graphite heat-conducting film, an alumina heat-conducting sheet, a boron nitride heat-conducting sheet, etc. In this embodiment, the heat-conducting cushion plate 5 is a synthetic graphite heat-conducting film.

[0055] Referring to Figure 4 and Figure 5 , that is, by arranging the flexible heat-conducting cushion plate 5 between the heating component 2 and the extrusion die 1, the gap between the heating component 2 and the extrusion die 1 can be reduced; when the heat is transferred from the heating component 2 to the extrusion die 1, it is convenient for the heat to be transferred between the heating component 2 and the extrusion die 1, improving the heat transfer efficiency to maintain the temperature of the extrusion die 1.

[0056] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A plastic particle forming mold, characterized in that: It includes an extrusion die (1) and a heating component (2); along the flow direction of the plastic melt, the extrusion die (1) includes a first component (11) and a second component (12), and the first component (11) and the second component (12) are integrally formed; a feed channel (111) is provided inside the first component (11), and a plurality of die holes (121) are provided in the second component (12), and the plurality of die holes (121) communicate with the feed channel (111); the heating component (2) is sleeved on the outer periphery of the second component (12), and the heating component (2) abuts against the second component (12), and the heating component (2) is used to heat the first component (11) and the plastic melt in the die holes (121).

2. The plastic particle forming mold according to claim 1, characterized in that: The heating component (2) includes a housing (21), a heating element (22) and a first connecting wire (23), the housing (21) is fixedly connected to the extrusion die (1), and the housing (21) fits against the outer periphery of the second component (12), a receiving cavity (211) is provided inside the housing (21), and the receiving cavity (211) is used to accommodate the heating element (22), the housing (21) is provided with a first mounting hole (212) for the first connecting wire (23) to pass through, one end of the first connecting wire (23) passes through the mounting hole and is connected to the heating element (22), and the other end of the first connecting wire (23) is connected to a power supply device.

3. The plastic particle forming mold according to claim 2, characterized in that: The heating component (2) further includes a temperature sensor (24), the temperature sensor (24) includes a temperature probe (241) and a second connecting wire (242) connected to each other, the housing (21) is provided with a second mounting hole (213) for the temperature probe (241) to be installed, the end of the temperature probe (241) extends into the receiving cavity (211), the temperature probe (241) is used to collect the temperature inside the receiving cavity (211), one end of the second connecting wire (242) is connected to the temperature probe (241), and the other end of the second connecting wire (242) is connected to a background terminal controller.

4. The plastic particle forming mold according to claim 1, characterized in that: The forming die further includes a fastener, and there are two heating components (2), the two heating components (2) are arranged oppositely, and the two heating components (2) enclose a through hole for the extrusion die (1) to be installed, and the ends of the two heating components (2) are connected by a fastener, and the fastener is used to force the heating component (2) to fit against the extrusion die (1).

5. The plastic particle forming mold according to claim 4, characterized in that: The fastener includes a fastening bolt (4) and a fastening nut, connection lugs (3) are provided at both ends of the heating component (2), and the connection lugs (3) are provided with third mounting holes (31) for the fastening bolt (4) to pass through, and the fastening bolt (4) passes through the two third mounting holes (31) and is threadedly connected to the fastening nut.

6. The plastic particle forming mold according to claim 4, wherein: The forming die further includes a flexible heat-conducting backing plate (5), and the heat-conducting backing plate (5) is arranged between the heating component (2) and the extrusion die (1).

7. The plastic particle forming mold according to claim 6, characterized in that: The heat-conducting backing plate (5) is a synthetic graphite heat-conducting film.

8. The plastic particle forming mold according to claim 1, wherein: An avoidance gap is provided at the end of the heating component (2) and the second component (12).

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