Nozzle structure and injection molding machine

Abstract

This invention discloses a nozzle structure and an injection molding machine, including a nozzle body and a crushing roller. The nozzle body has an inlet, an outlet, and a main channel connecting the inlet and outlet. The crushing roller is rotatably disposed in the main channel and forms a material passage between itself and the side wall of the main channel. The material passage connects the inlet and outlet. The crushing roller is used to crush and agitate the molten material. It can utilize the crushing roller to crush and agitate the molten material in the material passage, continuously refining the solids in the molten material. Simultaneously, it causes the molten material to continuously change its flow direction and alternate and merge. Furthermore, the molten material is subjected to axial and rotational forces, thereby effectively melting, mixing, and homogenizing the molten material, resulting in fully plasticized molten material and better product quality.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a nozzle structure and an injection molding machine. Background Technology

[0002] Plasticization of plastics is the primary condition for achieving good injection molding and ensuring the quality of molded products. Currently, the principle of plasticization is as follows: During pre-plasticization, the screw rotates, continuously propelling the material falling from the feed port into the screw channel forward. The heating coil transfers heat to the material in the screw channel through the barrel wall. Under the dual action of external heating and screw rotation shearing, and after passing through the thermal process of each functional section of the screw, the solid material achieves plasticization and melting. The molten material pushes open the check ring and flows into the storage chamber of the barrel through the channel inside the screw head, generating back pressure and pushing the screw backward to complete the metering of the molten material. During injection, the screw acts as a plunger, moving forward rapidly under the action of the hydraulic cylinder, injecting the melt in the storage chamber into the mold through the nozzle.

[0003] In practical applications, even after using a screw to melt plastic, the molten material still cannot be fully melted, homogenized, and mixed, resulting in defects in the quality of the molded products. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a nozzle structure that can fully melt, homogenize and mix the molten material, thereby improving the quality of the product; the present invention also aims to provide an injection molding machine that can fully melt, homogenize and mix the molten material, thereby improving the quality of the product.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] The nozzle structure includes a nozzle body and a crushing roller. The nozzle body is provided with a feed inlet, a discharge outlet, and a main channel connecting the feed inlet and the discharge outlet. The crushing roller is rotatably disposed in the main channel and forms a material passage between itself and the side wall of the main channel. The material passage connects the feed inlet and the discharge outlet. The crushing roller is used to crush and stir the molten material in the material passage.

[0007] Furthermore, the crushing roller can be rotated by the pressure of the molten material entering the material passage.

[0008] Furthermore, the nozzle body is also provided with a shrinkage channel and a diffuser channel that are arranged one by one and connected to each other. The shrinkage channel is connected to the feed inlet and gradually shrinks from one end near the feed inlet to the other end. The diffuser channel is connected to the feed channel and gradually expands from one end near the shrinkage channel to the other end.

[0009] Furthermore, the crushing roller includes a roller shaft and a plurality of crushing protrusions spaced apart on the outer peripheral wall of the roller shaft, the crushing protrusions being used to crush the solids in the molten material.

[0010] Furthermore, the roller shaft is provided with multiple sets of crushing protrusions along its axial direction. Each set of crushing protrusions includes multiple crushing protrusions arranged one by one and spaced apart around the axis of the roller shaft, and the crushing protrusions in each set are spaced apart.

[0011] Furthermore, the crushing roller is rotatably disposed in the main channel via at least one set of rolling elements, and each set of rolling elements includes a plurality of rolling elements arranged one by one and spaced apart around the axis of the crushing roller.

[0012] Furthermore, the rolling element is a ball; the main channel is provided with a first concave ring that is partially adapted to each of the balls, and the crushing roller is provided with a second concave ring that is partially adapted to each of the balls. The first concave ring and the second concave ring cooperate with each of the balls in a one-to-one manner to limit each ball and prevent the balls from jumping radially and axially.

[0013] Furthermore, a set of rolling elements is provided at both ends of the crushing roller along its axial direction.

[0014] Furthermore, the outer peripheral wall of the crushing roller is provided with two annular raceways, and each of the rolling elements in each group of rolling elements is correspondingly located in each of the annular raceways.

[0015] Furthermore, the nozzle body includes a connecting body and a nozzle head. The connecting body is provided with the feed inlet and a first channel, and the nozzle head is provided with the discharge outlet and a second channel. The end of the nozzle head away from the discharge outlet is inserted into the end of the connecting body away from the feed inlet, and the first channel and the second channel are connected to form the main channel.

[0016] Furthermore, it also includes a heating coil and a temperature detector. The heating coil is disposed on the outer peripheral wall of the nozzle body and surrounds the material passage. The heating coil is used to heat the molten material in the material passage. The temperature detector is disposed on the nozzle body and is used to detect the temperature of the nozzle body.

[0017] Injection molding machine, including the nozzle structure described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The nozzle structure of the present invention has a rotatable crushing roller in the main channel. As the molten material enters the nozzle body from the feed port and flows through the material channel, the rotation of the crushing roller can crush and stir the molten material in the material channel, so that the solids in the molten material are continuously refined. At the same time, the molten material continuously changes its flow direction and continuously alternates and merges. In addition, the molten material is subjected to axial and rotational forces, thereby effectively melting, mixing and homogenizing the molten material, so as to fully plasticize the molten material and improve the quality of the product.

[0020] In addition, as the crushing roller rotates continuously as the molten material passes through the material passage, it drives the molten material to alternate continuously, which can avoid dead corners and make the melting, mixing and homogenization of the molten material more uniform and sufficient. At the same time, it can reduce the residence time of the molten material on the crushing roller and reduce the pressure difference of the crushing roller, so as to further improve the quality of the product.

[0021] In addition, the crushing roller can be kept rotating during the injection process, which can effectively clean the molten material in the material passage. This allows injection molding machines with this nozzle structure to quickly switch to production of different colored products, thus improving production efficiency.

[0022] The injection molding machine of the present invention, by adopting the above-mentioned nozzle structure, can effectively melt, mix and homogenize the molten material, thereby fully plasticizing the molten material and improving the quality of the product. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the nozzle structure of the present invention from a first-view perspective;

[0024] Figure 2 This is a schematic diagram of the nozzle structure of the present invention from a second perspective;

[0025] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0026] Figure 4 This is an exploded view of the nozzle structure of the present invention.

[0027] In the diagram: 10. Nozzle body; 11. Connecting body; 111. Feed inlet; 112. First channel; 113. Contraction channel; 114. Diffusion channel; 12. Nozzle head; 121. Discharge outlet; 122. Second channel; 13. Material passage channel; 14. First concave ring; 20. Crushing roller; 21. Roller shaft; 22. Crushing protrusion; 23. Second concave ring; 30. Rolling element; 40. Heating coil; 50. Temperature detector. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] See Figures 1-4 The image shows a nozzle structure according to a preferred embodiment of the present invention, including a nozzle body 10 and a crushing roller 20. The nozzle body 10 is provided with a feed inlet 111, a discharge outlet 121 and a main channel connecting the feed inlet 111 and the discharge outlet 121. The crushing roller 20 is rotatably disposed in the main channel and forms a material passage 13 with the side wall of the main channel. The material passage 13 connects the feed inlet 111 and the discharge outlet 121. The crushing roller 20 is used to crush and stir the molten material in the material passage 13.

[0030] In this embodiment, the crushing roller 20 can be rotated by the pressure of the molten material entering the material passage 13, without the need for an additional power source, resulting in a simpler structure, higher operational reliability, and reduced costs. In other embodiments, a power source can also be provided on the nozzle body 10 to drive the crushing roller 20 to rotate reliably.

[0031] The nozzle structure of the present invention has a rotatable crushing roller 20 in the main channel. When the molten material enters the nozzle body 10 from the feed port 111 and flows through the material passage 13, the rotation of the crushing roller 20 can crush and stir the molten material in the material passage 13, so that the solids in the molten material are continuously refined. At the same time, the molten material continuously changes its flow direction and continuously alternates and merges. In addition, the molten material is subjected to axial and rotational forces, thereby effectively melting, mixing and homogenizing the molten material, so that the molten material is fully plasticized and the product quality is better.

[0032] In addition, as the molten material passes through the material passage 13, the crushing roller 20 rotates continuously, causing the molten material to alternate continuously, which can avoid dead corners and make the melting, mixing and homogenization of the molten material more uniform and sufficient. At the same time, it can reduce the residence time of the molten material on the crushing roller 20 and reduce the pressure difference of the crushing roller 20, so as to further improve the quality of the product.

[0033] In addition, during the injection process, the crushing roller 20 can be kept rotating, which can effectively clean the molten material in the material passage 13, allowing the injection molding machine with this nozzle structure to enter the production of different colored products more quickly, which helps to improve production efficiency.

[0034] See Figure 3 and Figure 4In this embodiment, the crushing roller 20 includes a roller shaft 21 and a plurality of crushing protrusions 22 spaced apart on the outer peripheral wall of the roller shaft 21. The crushing protrusions 22 are used to crush the solids in the molten material. During the flow of the molten material in the material passage 13, the molten material and the crushing protrusions 22 collide violently, and the molten material is repeatedly diverted and merged by the plurality of crushing protrusions 22, so that the solids in the molten material are continuously refined, thereby making the melting, mixing and homogenization effect of the molten material better, which can further improve the quality of the product.

[0035] See Figure 3 and Figure 4 In this embodiment, the roller 21 is provided with multiple sets of crushing protrusions 22 along its axial direction. Each set of crushing protrusions 22 includes multiple crushing protrusions 22 arranged one by one and spaced apart around the axis of the roller 21. The structure can achieve better melting, mixing and homogenization of the molten material.

[0036] In this embodiment, the cross-section of the broken protrusion 22 may be rectangular, triangular, trapezoidal or other irregular shapes.

[0037] In other embodiments, multiple breaking protrusions 22 can be spirally arranged around the axis of the roller shaft 21, which can also serve to divide and merge the molten material multiple times.

[0038] In other embodiments, the crushing roller 20 may specifically include only a plurality of crushing protrusions 22 arranged and connected sequentially along the axial direction of the main channel.

[0039] See Figure 3 The crushing roller 20 is rotatably mounted in the main channel via two sets of rolling elements 30. Each set of rolling elements 30 is spaced apart along the axial direction of the crushing roller 20. Each set of rolling elements 30 includes multiple rolling elements 30 arranged one by one and spaced apart around the axis of the crushing roller 20 to reliably support the crushing roller 20. Moreover, the arrangement of these rolling elements 30 allows for rolling friction between the crushing roller 20 and the main channel, which can reduce resistance, reduce the driving force required for the crushing roller 20, and make the crushing roller 20 rotate more smoothly.

[0040] In this embodiment, the rolling element 30 is a ball bearing; the main channel is provided with a first concave ring 14 that is locally adapted to each ball bearing, and the crushing roller 20 is provided with a second concave ring 23 that is locally adapted to each ball bearing. The first concave ring 14 and the second concave ring 23 cooperate with each ball bearing in a one-to-one manner to limit each ball bearing, thereby preventing each ball bearing from running radially and axially, which improves reliability. At the same time, since the first concave ring 14 and the second concave ring 23 are locally adapted to the ball bearing, they can provide good guidance for each ball bearing, so that each ball bearing runs more smoothly.

[0041] In other embodiments, the rolling element 30 may also be a roller or a needle roller, and is not limited thereto.

[0042] In other embodiments, one or more sets of rolling elements 30 may be provided. When one set of rolling elements 30 is provided, this set of rolling elements 30 may be located in the middle position of the crushing roller 20 to provide stable support for the crushing roller 20.

[0043] See Figure 3 In this embodiment, the nozzle body 10 is also provided with a shrinkage channel 113 and a diffusion channel 114 that are arranged one after another and connected. The shrinkage channel 113 is connected to the feed port 111 and gradually shrinks from one end near the feed port 111 to the other end. The diffusion channel 114 is connected to the feed passage 13 and gradually expands from one end near the shrinkage channel 113 to the other end. The shrinkage channel 113 can accelerate the molten material, making the flow speed of the molten material higher. The diffusion channel 114 can diffuse the accelerated molten material, making the flow speed and pressure of the molten material entering the feed passage 13 greatly increase. This causes the molten material to collide violently with the crushing roller 20, so as to reliably drive the crushing roller 20 to rotate. At the same time, it is also beneficial to improve the melting, mixing and homogenization effect of the molten material.

[0044] like Figure 3 In this embodiment, the feed inlet 111, the shrinkage channel 113, the expansion channel 114, the main channel and the discharge outlet 121 are arranged one by one along the length of the nozzle body 10.

[0045] See Figures 1-4 In this embodiment, the nozzle body 10 includes a connecting body 11 and a nozzle head 12. The connecting body 11 is provided with a feed inlet 111 and a first channel 112. The nozzle head 12 is provided with a discharge outlet 121 and a second channel 122. The end of the nozzle head 12 away from the discharge outlet 121 is inserted into the end of the connecting body 11 away from the feed inlet 111. The first channel 112 and the second channel 122 are connected to form a main channel. This arrangement makes it easier to install the crushing roller 20, reduces installation difficulty, and improves assembly efficiency.

[0046] In this embodiment, the nozzle structure also includes a heating coil 40 and a temperature detector 50. The heating coil 40 is disposed on the outer peripheral wall of the nozzle body 10 and surrounds the material passage 13. The heating coil 40 is used to heat the molten material in the material passage 13, so that the molten material is fully melted and the plasticizing effect is better. The temperature detector 50 is disposed on the nozzle body 10 and is used to detect the temperature of the nozzle body 10. The control system of the injection molding machine using this nozzle structure can control the operation of the heating coil 40 according to the detection information of the temperature detector 50, so as to maintain the temperature of the molten material in the material passage 13 at the set temperature and improve the plasticizing effect of the molten material.

[0047] The present invention also provides an injection molding machine including the above-described nozzle structure. Because the injection molding machine of the present invention employs the above-described nozzle structure, it can effectively melt, mix, and homogenize the molten material, thereby fully plasticizing the molten material and improving product quality.

[0048] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A nozzle structure, characterized in that, include: The nozzle body is provided with an inlet, an outlet and a main channel connecting the inlet and the outlet; A crushing roller is rotatably disposed in the main channel and forms a material passage between the crushing roller and the side wall of the main channel. The material passage connects the feed inlet and the discharge outlet. The crushing roller is used to crush and stir the molten material in the material passage. The crushing roller can be driven to rotate by the pressure of the molten material entering the material passage; The nozzle body is also provided with a shrinkage channel and a diffuser channel that are arranged one by one and connected to each other. The shrinkage channel is connected to the feed inlet and gradually shrinks from one end near the feed inlet to the other end. The diffuser channel is connected to the feed channel and gradually expands from one end near the shrinkage channel to the other end. The crushing roller includes a roller shaft and a plurality of crushing protrusions spaced apart on the outer peripheral wall of the roller shaft. The crushing protrusions are used to crush the solids in the molten material. The roller shaft is provided with multiple sets of crushing protrusions along its axial direction. Each set of crushing protrusions includes multiple crushing protrusions arranged one by one and spaced apart around the axis of the roller shaft, and the crushing protrusions in each set are spaced apart. The crushing roller is rotatably disposed in the main channel via at least one set of rolling elements, each set of rolling elements comprising a plurality of rolling elements arranged sequentially and spaced apart around the axis of the crushing roller.

2. The nozzle structure as described in claim 1, characterized in that, The rolling element is a ball bearing; the main channel is provided with a first concave ring that is partially adapted to each of the balls bearings, and the crushing roller is provided with a second concave ring that is partially adapted to each of the balls bearings. The first concave ring and the second concave ring cooperate with each of the balls bearings in a one-to-one manner to limit each ball bearing, so as to prevent the balls bearings from jumping radially and axially.

3. The nozzle structure as described in claim 1, characterized in that, The crushing roller is provided with a set of rolling elements at both ends along its axial direction.

4. The nozzle structure as described in claim 1, characterized in that, It also includes a heating coil and a temperature detector. The heating coil is disposed on the outer peripheral wall of the nozzle body and surrounds the material passage. The heating coil is used to heat the molten material in the material passage. The temperature detector is disposed on the nozzle body and is used to detect the temperature of the nozzle body.

5. An injection molding machine, characterized in that, The nozzle structure includes any one of claims 1-4.

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