Co-injection type hot runner system

Abstract

A co-injection type hot runner system comprises a splitter plate, a valve needle, a valve sleeve and a hot nozzle, the splitter plate is provided with a first injection channel and a second injection channel, at least one part of the valve needle is movably arranged in the valve sleeve in the vertical direction, and at least one part of the valve sleeve is movably arranged in the hot nozzle in the vertical direction. A first flow channel communicated with the first injection channel is formed in the inner side of the valve sleeve, first plastic materials are arranged in the first injection channel and the first flow channel, when the valve needle is located at the lowest position, the valve needle blocks the first plastic materials, and a second flow channel communicated with the second injection channel is formed in the outer side of the valve sleeve. A second plastic material is arranged in the second injection channel and the second flow channel, and when the valve needle and the valve sleeve are both located at the lowest position, the valve needle or the valve sleeve blocks the second plastic material. The hot runner system is provided with the valve sleeve capable of moving up and down, so that the transmission of various plastic materials can be realized through the matching of the valve needle, the valve sleeve and the hot nozzle, the cost is reduced, and the structure is simplified.

Description

Technical Field

[0001] The utility model relates to a hot runner system, in particular to a co-injection hot runner system. Background Art

[0002] The hot runner system is a system used to transfer plastic materials in the injection mold. Some products need to be formed with multiple plastic materials. Accordingly, some hot runner systems can transfer multiple plastic materials at the same time. For example, the Chinese utility model CN205343661U discloses a multi-layer material simultaneous injection hot nozzle and the Chinese utility model CN204773273U discloses a two-color injection hot runner system.

[0003] However, the above hot runner systems all form multiple runners by stacking multiple hot nozzles, which have high costs, greatly increasing the cost of the hot runner system. In addition, the structure of the hot nozzle is relatively complex, and stacking hot nozzles will complicate the structure of the hot runner system. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to design a co-injection hot runner system that uses a single hot nozzle structure to achieve simultaneous transmission of multiple plastic materials, thereby avoiding cost increases and structural complications.

[0005] To achieve the above-mentioned purpose, the utility model provides a co-injection hot runner system, including: a diverter plate, a valve needle, a valve sleeve and a hot nozzle, the diverter plate is provided with a first injection channel and a second injection channel, at least a portion of the valve needle is movably arranged in the valve sleeve along the up-down direction, the upper end of the valve sleeve is tightly matched with the valve needle, at least a portion of the valve sleeve is movably arranged on the hot nozzle along the up-down direction, a first flow channel connected with the first injection channel is formed on the inner side of the valve sleeve, the first injection channel and the first flow channel contain a first plastic material, when the valve needle is at the lowest position, the valve needle blocks the first plastic material, a second flow channel connected with the second injection channel is formed on the outer side of the valve sleeve, the second injection channel and the second flow channel contain a second plastic material, when the valve needle and the valve sleeve are both at the lowest position, the valve needle or the valve sleeve blocks the second plastic material.

[0006] Furthermore, the diverter plate is also provided with a valve sleeve insert, and the valve sleeve passes through the valve sleeve insert in the up-down direction, wherein the valve sleeve insert can guide the movement of the valve sleeve.

[0007] Furthermore, the first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the hot nozzle. When the valve sleeve is at the lowest position, the valve sleeve blocks the second flow channel. The up and down movement of the valve sleeve can block and open the second flow channel, thereby controlling the transmission of the second plastic material.

[0008] Furthermore, the hot nozzle is provided with a hot nozzle flow channel connected to the first flow channel, the hot nozzle flow channel is connected to the outside of the hot nozzle, and the hot nozzle flow channel contains a first plastic material. The hot nozzle flow channel is provided so that the first plastic material can flow to the outside of the hot nozzle, so that the first plastic material wraps the second plastic material in the mold cavity.

[0009] Furthermore, the first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the hot nozzle. When the valve needle is at the lowest position, the valve needle blocks the second flow channel. This structure can realize the co-injection of multiple plastic materials without moving the valve sleeve.

[0010] Furthermore, the manifold is also provided with a manifold insert, at least a part of which is arranged in the hot nozzle; the first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the manifold insert; a third flow channel connected to the first injection channel is formed between the manifold insert and the hot nozzle, and the third flow channel has a first plastic material, and when the valve needle is at the lowest position, the valve needle blocks the third flow channel; when the valve sleeve is at the lowest position, the valve sleeve blocks the second flow channel. This structure can realize the co-injection of three layers of plastic materials to form a three-layer product.

[0011] After adopting the above technical scheme, the beneficial effect of the utility model is: since the hot runner system of the utility model is provided with a valve sleeve that can move up and down, it can realize the transmission of various plastic materials through the cooperation of the valve needle, the valve sleeve and the hot nozzle, which not only reduces the cost but also simplifies the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the hot runner system involved in Example 1 of the utility model;

[0013] Figure 2 It is a partial enlarged view of the hot runner system involved in Example 1 of the utility model at circle A;

[0014] Figure 3 It is a schematic diagram of a hot runner system involved in Example 2 of the utility model;

[0015] Figure 4 It is a partial enlarged view of the hot runner system involved in Example 2 of the utility model at circle B;

[0016] Figure 5 It is a schematic diagram of a hot runner system involved in Example 3 of the utility model;

[0017] Figure 6 It is a partial enlarged view of the hot runner system involved in Example 3 of the utility model at circle C.

[0018] The accompanying drawings are marked as follows: 1. diverter plate; 2. valve needle; 3. valve sleeve; 4. hot nozzle; 10. first flow channel; 11. first injection channel; 12. second injection channel; 13. valve sleeve insert; 14. diverter plate insert; 20. second flow channel; 30. third flow channel; 41. hot nozzle flow channel; 100. first plastic material; 200. second plastic material; 300. product. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below by way of embodiments:

[0020] [Example 1]

[0021] The utility model provides a co-injection hot runner system, combined with Figures 1-2 As shown, the hot runner system includes: a manifold 1, a valve needle 2, a valve sleeve 3 and a hot nozzle 4, the manifold 1 is provided with a first injection channel 11, a second injection channel 12 and a valve sleeve insert 13, the manifold 1 is fixed to the hot nozzle 4, at least a part of the valve needle 2 is movably arranged in the valve sleeve 3 along the up-down direction, the upper end of the valve sleeve 3 is tightly matched with the valve needle 2, the valve sleeve 3 passes through the valve sleeve insert 13 along the up-down direction, at least a part of the valve sleeve 3 is movably arranged in the hot nozzle 4 along the up-down direction, and the inner side of the valve sleeve 3 is formed with a first flow channel 10 connected with the first injection channel 11 The hot nozzle 4 is provided with a hot nozzle flow channel 41 connected with the first flow channel 10, and the hot nozzle flow channel 41 is connected with the outside of the hot nozzle 4. The first injection channel 11, the first flow channel 10 and the hot nozzle flow channel 41 have a first plastic material 100. When the valve needle 2 is located at the lowest position, the valve needle 2 blocks the first plastic material 100. The outer side of the valve sleeve 3 is formed with a second flow channel 20 connected with the second injection channel 12. The second injection channel 12 and the second flow channel 20 have a second plastic material 200. When the valve sleeve 3 is located at the lowest position, the valve sleeve 3 blocks the second plastic material 200.

[0022] When using the hot runner system, firstly, the first plastic material 100 and the second plastic material 200 are injected through the first injection channel 11 and the second injection channel 12 respectively. The first flow channel 10 receives the first plastic material 100 and flows to the cavity between the hot nozzle 4 and the upper mold plate through the hot nozzle flow channel 41. At this time, the valve needle 2 blocks the cavity. The second flow channel 20 receives the second plastic material 200. At this time, the valve sleeve 3 blocks the second flow channel 20. Then, the valve needle 2 is moved upward for a distance to open the needle for the first time. At this time, the hot nozzle 4 and the upper mold plate are in contact with each other. The cavity between the templates is opened, and the first plastic material 100 enters the mold cavity; then the valve needle 2 and the valve sleeve 3 are moved upward for a distance at the same time, and the needle is opened for the second time. At this time, the second flow channel 20 is opened, and the second plastic material 200 enters the mold cavity and the interior of the first plastic material 100, forming a product 300 with the first plastic material 100 as the outer layer and the second plastic material 200 as the inner layer; after the mold cavity is filled, the valve needle 2 and the valve sleeve 3 are moved downward at the same time to re-block the cavity and the second flow channel 20. Among them, the upper end of the valve sleeve 3 guides the movement of the valve needle 2.

[0023] In this embodiment, the first flow channel 10 is located between the valve needle 2 and the valve sleeve 3, and the second flow channel 20 is located between the valve sleeve 3 and the hot nozzle 4. The outer wall of the valve sleeve 3 is provided with an upper inclined surface, and the inner wall of the hot nozzle 4 is provided with a lower inclined surface. When the valve sleeve 3 is at the lowest position, the upper inclined surface and the lower inclined surface are in contact with each other to block the second flow channel 20.

[0024] [Example 2]

[0025] In this embodiment, combined with Figures 3-4 As shown, different from Example 1, the hot nozzle 4 is not provided with a hot nozzle flow channel, and the first plastic material 100 in the first flow channel 10 directly leads to the cavity of the mold. When the valve needle 2 and the valve sleeve 3 are both at the lowest position, the valve needle 2 blocks the second flow channel 20, while the valve sleeve 3 does not block the second flow channel 20.

[0026] Specifically, when the needle is opened for the first time, the valve needle 2 is moved upward for a distance, the second flow channel 20 is opened, and the second plastic material 200 enters the mold cavity; when the needle is opened for the second time, the valve needle 2 is continued to be moved upward for a distance, the first flow channel 10 is opened, the first plastic material 100 enters the mold cavity and enters the interior of the second plastic material 200, forming a product 300 with an outer layer of the second plastic material 200 and an inner layer of the first plastic material 100. The other structures of this embodiment are similar to those of Embodiment 1 and are not described in detail here.

[0027] That is to say, in this embodiment, the valve sleeve 3 does not need to be moved during the injection molding process, and the hot runner system can also perform the co-injection operation of multiple plastic materials in a manner of not moving the valve sleeve 3 .

[0028] [Example 3]

[0029] In this embodiment, combined with Figures 5-6 As shown, different from Example 1, the hot nozzle 4 is not provided with a hot nozzle flow channel, and the first plastic material 100 in the first flow channel 10 directly leads to the cavity of the mold; the diverter plate 1 is also provided with a diverter plate insert 14, at least a part of the diverter plate insert 14 is arranged in the hot nozzle 4 and fixed to the hot nozzle 4; the first flow channel 10 is located between the valve needle 2 and the valve sleeve 3, and the second flow channel 20 is located between the valve sleeve 3 and the diverter plate insert 14; a third flow channel 30 connected to the first injection channel 11 is formed between the diverter plate insert 14 and the hot nozzle 4, and the third flow channel 30 has the first plastic material 100. When the valve needle 2 is at the lowest position, the valve needle 2 blocks the third flow channel 30.

[0030] When the needle is opened for the first time, the valve needle 2 is moved upward for a distance, the third flow channel 30 is opened, and the first plastic material 100 enters the mold cavity; when the needle is opened for the second time, the valve needle 2 and the valve sleeve 3 are moved upward for a distance at the same time, the first flow channel 10 and the second flow channel 20 are opened at the same time, the first plastic material 100 of the first flow channel 10 and the second plastic material 200 of the second flow channel 20 enter the mold cavity at the same time, the first plastic material 100 of the first flow channel 10 is located inside the second plastic material 200 of the second flow channel 20, and the second plastic material 200 of the second flow channel 20 is located inside the first plastic material 100 of the third flow channel 30, thereby forming a product 300 with the first plastic material 100 as the inner layer, the second plastic material 200 as the middle layer, and the first plastic material 100 as the outer layer. The other structures of this embodiment are similar to those of embodiment 1, and will not be repeated here.

Claims

1. A co-injection hot runner system, comprising: A diverter plate, a valve needle, a valve sleeve and a hot nozzle, the diverter plate is provided with a first injection channel and a second injection channel, at least a portion of the valve needle is movably arranged in the valve sleeve along the up-down direction, the upper end of the valve sleeve is tightly matched with the valve needle, and is characterized in that: at least a portion of the valve sleeve is movably arranged in the hot nozzle along the up-down direction, a first flow channel connected with the first injection channel is formed on the inner side of the valve sleeve, the first injection channel and the first flow channel contain a first plastic material, when the valve needle is at the lowest position, the valve needle blocks the first plastic material, a second flow channel connected with the second injection channel is formed on the outer side of the valve sleeve, the second injection channel and the second flow channel contain a second plastic material, when the valve needle and the valve sleeve are both at the lowest position, the valve needle or the valve sleeve blocks the second plastic material.

2. The co-injection hot runner system according to claim 1, characterized in that: The diverter plate is also provided with a valve sleeve insert, and the valve sleeve passes through the valve sleeve insert in the up and down directions.

3. The co-injection hot runner system according to claim 1, characterized in that: The first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the hot nozzle. When the valve sleeve is located at the lowest position, the valve sleeve blocks the second flow channel.

4. The co-injection hot runner system according to claim 3, characterized in that: The hot nozzle is provided with a hot nozzle flow channel communicated with the first flow channel, the hot nozzle flow channel is communicated with the outside of the hot nozzle, and the hot nozzle flow channel contains a first plastic material.

5. The co-injection hot runner system according to claim 1, characterized in that: The first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the hot nozzle. When the valve needle is located at the lowest position, the valve needle blocks the second flow channel.

6. The co-injection hot runner system according to claim 1, characterized in that: The diverter plate is also provided with a diverter plate inlay, at least a part of which is arranged in the hot nozzle; the first flow channel is located between the valve needle and the valve sleeve, and the second flow channel is located between the valve sleeve and the diverter plate inlay; a third flow channel connected to the first injection channel is formed between the diverter plate inlay and the hot nozzle, and the third flow channel has a first plastic material. When the valve needle is at the lowest position, the valve needle blocks the third flow channel; when the valve sleeve is at the lowest position, the valve sleeve blocks the second flow channel.

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