Melt conveying device and online resin modification forming equipment

Abstract

The utility model discloses a melt conveying device and resin online modification forming equipment, and belongs to the field of plastic forming processing.The melt conveying device comprises a cavity and a control valve, the cavity comprises a feeding port and a discharging port, the control valve comprises a valve seat, a valve deck, a valve element and a valve element control rod, and the valve seat and the valve deck are provided with a containing cavity in a matched mode; the valve cover is provided with a feeding channel, the valve seat is provided with a discharging channel, the valve element can move in the containing cavity, the valve element control rod comprises a first branch part and a second branch part, the outer diameter of the first branch part is smaller than that of the second branch part, the outer diameter of the second branch part is smaller than the inner diameter of the cavity, the valve element control rod can move in the cavity, and the structure is simpler. The melt direction switching mode is improved while the melt is conveyed, no control program needs to be additionally added, the material leakage risk of the melt switching device is reduced, and the operation reliability of the mechanism is improved.

Description

Technical Field

[0001] The present invention belongs to the field of plastic processing, and particularly relates to a melt conveying device and an on-line resin modification molding device. Background Art

[0002] Resin modification refers to changing the molecular structure or chemical properties of resin by physical or chemical means, so as to improve its performance or endow it with new properties. The modified resin may be improved in terms of processability, heat resistance, corrosion resistance, mechanical properties, etc. The molding process after resin modification mainly uses the modified resin for various molding operations, such as injection molding, extrusion molding, blow molding, etc.

[0003] In the prior art, based on the improvement of the LFT-D (Long Fiber Reinforced Thermoplastic Composite Direct Molding Process) technology, a modified molding device is proposed. This device has an extruder, a molding machine, and a melt conveying system. Such a device not only has the advantages of realizing the modification and molding of plastics with one-time heating, reducing the damage to the plastic molecular structure, and improving the quality and performance of plastic products, but also can realize the modification molding of thermoplastic plastics with a relatively high melting point and a relatively fast cold crystallization rate, improving the production efficiency and expanding the application range of the on-line molding technology.

[0004] The above-mentioned device can achieve the purpose of on-line molding, but the structure it adopts still has deficiencies. Since the modification and molding of plastics are two different processes, when the melt enters the molding process after extrusion, it is necessary to control the flow direction of the melt. In the prior art, a melt switching valve controlled by an oil cylinder is used, which requires an additional control program, has a complex control logic, and has a low operating reliability. At the same time, during the molding process, the melt processed by the extruder enters a buffer cylinder for temporary storage, and the structural design is complex. Summary of the Invention

[0005] In order to overcome the problems of complex melt commutation structure and low reliability in the melt conveying process in the prior art, the purpose of the present application is to provide a melt conveying device with a simple structure and capable of controlling the melt flow direction, which is specifically achieved through the following technical solutions:

[0006] A melt conveying device includes a cavity and a control valve. The cavity includes a feed inlet and a discharge outlet. The control valve includes a valve seat, a valve cover, a valve core, and a valve core control rod. The valve seat and the valve cover are cooperatively provided with a receiving cavity. The valve cover is provided with a feed channel, and the valve seat is provided with a discharge channel. The valve core can move within the receiving cavity. The positions of the valve core facing the feed channel and the discharge channel are the upper end face and the lower end face respectively. When the upper end face fits with the feed channel, the melt in the feed channel is blocked from flowing into the receiving cavity. The lower end face is provided with a melt channel. When the lower end face of the valve core fits with the discharge channel, the melt flows out of the receiving cavity through the melt channel. The valve core control rod includes a first part and a second part. The outer diameter of the first part is smaller than that of the second part, and the outer diameter of the second part is smaller than the inner diameter of the cavity. The valve core control rod can move within the cavity.

[0007] Optionally, the second part is provided with a sealing needle structure.

[0008] Optionally, a damping ring is provided on the inner wall of the sealing needle.

[0009] Optionally, the second part can perform relative parallel movement with respect to the first part.

[0010] Optionally, a jacket is provided between the second part and the inner wall of the cavity.

[0011] Optionally, the valve core control rod moves axially within the cavity.

[0012] Optionally, the valve core is provided with a mounting hole at the top.

[0013] Optionally, the melt channel is a smooth curved surface.

[0014] Optionally, the valve seat is provided with a through hole communicating with the discharge channel.

[0015] This application also provides a resin on-line modification and molding device, which includes the melt conveying device according to any one of the above, and further includes a modification system, a storage and injection system, and a mold. The modification system includes an extruder, and the storage and injection system includes an injection cylinder, a storage cylinder, and a nozzle.

[0016] Optionally, the through holes are respectively connected to the storage cylinder and the nozzle.

[0017] Optionally, the extruder and the storage cylinder are arranged in parallel, and the position of the extruder is higher than that of the storage cylinder.

[0018] The working principle of the melt conveying device of the present application is as follows: The modified melt flows into the cavity through the feed port. During the storage process, the valve core control rod is pushed forward under the action of the oil cylinder, reducing the cavity volume to the minimum value. At this time, the lower end face of the valve core fits with the discharge channel, and the melt flows through the melt channel and then into the storage system through the through hole. The nozzle direction depends on the die sealing effect, and the melt will not flow in the nozzle direction. After the storage is completed, the injection process begins. The valve core control rod is retracted under the action of the oil cylinder, and the channel volume increases. At this time, the upper end face of the valve core fits with the feed channel, blocking the connection between the cavity and the storage system. The melt that has stopped injection flows back into the cavity, and at the same time, the melt from the extruder enters the cavity for temporary storage, acting as a buffer cylinder.

[0019] Compared with the prior art, the present application has the following beneficial effects: The volume of the cavity can change with the working stage of the device, eliminating the need for a buffer cylinder, making the structure simpler. While conveying the melt, the way of switching the melt direction is improved, without the need to add an additional control program, reducing the risk of leakage of the melt switching device and enhancing the reliability of the mechanism operation. Description of the Drawings

[0020] Figure 1 Structural schematic diagram of the melt conveying device described in Embodiment 1;

[0021] Figure 2 Cross-sectional structural schematic diagram of the melt conveying device described in Embodiment 1;

[0022] Figure 3 Structural schematic diagram of the control valve described in Embodiment 1;

[0023] Figure 4 Structural schematic diagram of the valve core control rod described in Embodiment 1;

[0024] Figure 5 Cross-sectional structural schematic diagram of the valve core control rod described in Embodiment 1;

[0025] Figure 6 Structural schematic diagram of the valve core described in Embodiment 1;

[0026] Figure 7 Structural schematic diagram of the valve core control rod described in Embodiment 2;

[0027] Figure 8 Cross-sectional structural schematic diagram of the valve core control rod described in Embodiment 2;

[0028] Figure 9 Structural schematic diagram of the resin on-line modification and molding equipment described in Embodiment 3.

[0029] In the figure, the reference numerals are: 1 - cavity, 101 - feed port, 102 - discharge port, 2 - control valve, 201 - valve seat, 2011 - through hole, 202 - valve cover, 203 - valve core, 2031 - mounting hole, 204 - valve core control rod, 2041 - first part, 2042 - second part, 205 - receiving cavity, 206 - feed channel, 207 - discharge channel, 208 - upper end face, 209 - lower end face, 210 - melt channel, 211 - sealing pin, 212 - damping ring, 213 - jacket, 3 - mold, 4 - extruder, 5 - injection cylinder, 6 - material storage cylinder, 7 - nozzle. Detailed implementation manners

[0030] The following elaborates the detailed implementation manners of the present application through embodiments. However, the specific implementation of the present application does not limit the technical solution of the present application. Any non-substantive changes such as common technical solution replacements in the art using the technical solutions described in the embodiments of the present application are within the protection scope of the present application.

[0031] The first and second in the present application are not specific, but are used to distinguish components, and those skilled in the art should understand. Embodiment

[0032] As Figures 1 to 6 shown, a melt conveying device includes a cavity 1 and a control valve 2. The cavity 1 includes a feed port 101 and a discharge port 102. The control valve 2 includes a valve seat 201, a valve cover 202, a valve core 203, and a valve core control rod 204. The valve seat 201 and the valve cover 202 are cooperatively provided with a receiving cavity 205. The valve cover 202 is provided with a feed channel 206, and the valve seat 201 is provided with a discharge channel 207. The valve core 203 can move in the receiving cavity 205. The positions of the valve core 203 facing the feed channel 206 and the discharge channel 207 are the upper end face 208 and the lower end face 209 respectively. When the upper end face 208 fits with the feed channel 206, the melt in the feed channel 206 is blocked from flowing into the receiving cavity 205. The lower end face 209 is provided with a melt channel 210. When the lower end face 209 of the valve core 203 fits with the discharge channel 207, the melt flows out of the receiving cavity 205 through the melt channel 210. The valve core control rod 204 includes a first part 2041 and a second part 2042. The outer diameter of the first part 2041 is smaller than that of the second part 2042, and the outer diameter of the second part 2042 is smaller than the inner diameter of the cavity 1. The valve core control rod 204 can move in the cavity 1.

[0033] In this embodiment, the second part 2042 is provided with a sealing pin 211 structure, so that the variation range of the volume of the cavity 1 increases, that is, the melt buffered in the cavity 1 increases. The inner wall of the sealing pin 211 is provided with a damping ring 212. The valve core control rod 204 drives the valve core 203 to move downward or upward through the damping ring 212 by introducing a downward or upward force.

[0034] In this embodiment, the second part 2042 can move relative to the first part 2041 in a parallel manner, that is, the needle 211 can axially move along the valve core control rod 204. When the relative displacement between the valve core control rod 204 and the needle 211 reaches the maximum, the volume of the cavity 1 becomes the largest.

[0035] In this embodiment, a jacket 213 is provided between the second part 2042 and the inner wall of the cavity 1 to prevent the existence of residual materials in the upper part of the cavity 1 and to fix the valve core control rod 204.

[0036] In this embodiment, the valve core control rod 204 moves axially in the cavity 1.

[0037] In this embodiment, the valve core 203 is provided with a mounting hole 2031 at the top, and the valve core control rod 204 is connected to the valve core 203 through the mounting hole 2031. In other embodiments, the valve core 203 and the valve core control rod 204 can also be integrally formed.

[0038] In this embodiment, the melt channel 210 is a smooth curved surface. In other embodiments, the melt channel 210 can be of any shape as long as it can satisfy that when the lower end surface 209 of the valve core 203 is in contact with the discharge channel 207, the melt can flow out through the melt channel 210.

[0039] In this embodiment, the valve seat 201 is provided with a through hole 2011 communicating with the discharge channel 207. Embodiment

[0040] As Figure 7 、 Figure 8 shown in a melt delivery device, other structures and working methods are the same as those in Embodiment 1 and will not be elaborated. The difference is that the second part 2042 of the valve core control rod 204 is no longer provided with a needle 211 and a damping ring 212, and the volume change of the cavity 1 is achieved by the difference in the outer diameters between the second part 2042 and the first part 2041. Embodiment

[0041] As Figure 9 shown in a resin on-line modification and molding equipment, which is characterized by including the melt delivery device described in Embodiment 1 or Embodiment 2, and further including a modification system, a storage and injection system, and a mold 3. The modification system includes an extruder 4, and the storage and injection system includes an injection cylinder 5, a storage cylinder 6, and a nozzle 7.

[0042] In this embodiment, the through hole 2011 is respectively connected to the storage cylinder 6 and the nozzle 7, and during the molding process, the melt flows into the nozzle 7 through the through hole in the storage cylinder 6.

[0043] In this embodiment, the extruder 4 and the storage cylinder 6 are arranged in parallel, and the position of the extruder 4 is higher than that of the storage cylinder 6, which optimizes the structural design and facilitates the replacement of the screw of the extruder 4.

[0044] Among them, in this embodiment, the power structure, heating and insulation system, cooling system, part ejection system, etc. that should also be included in the mold 3 can be understood by those skilled in the art based on their experience on how to implement them, which do not belong to the key points of this application and will not be elaborated here.

[0045] It should be noted that for the components used in the above embodiments, those skilled in the art can select or replace them according to their needs, which does not exceed the protection scope of this application.

Claims

1. A melt conveying device, characterized in that: The invention comprises a cavity and a control valve, wherein the cavity comprises a feed port and a discharge port, the control valve comprises a valve seat, a valve cover, a valve core and a valve core control rod, the valve seat and the valve cover cooperate to form an accommodating cavity, the valve cover is provided with a feed channel, the valve seat is provided with a discharge channel, the valve core can move in the accommodating cavity, the positions of the valve core facing the feed channel and the discharge channel are the upper end face and the lower end face respectively, the upper end face is fitted with the feed channel, the melt in the feed channel is blocked from flowing into the accommodating cavity, the lower end face is provided with a melt channel, when the lower end face of the valve core is fitted with the discharge channel, the melt flows out of the accommodating cavity through the melt channel, the valve core control rod comprises a first section and a second section, the outer diameter of the first section is smaller than the outer diameter of the second section, the outer diameter of the second section is smaller than the inner diameter of the cavity, and the valve core control rod can move in the cavity.

2. The melt conveying device according to claim 1, characterized in that: The second subsection is provided with a sealing needle structure.

3. The melt conveying device according to claim 2, characterized in that: A damping ring is arranged on the inner wall of the sealing needle.

4. The melt conveying device according to claim 1, characterized in that: The second section can realize relative parallel movement with the first section.

5. The melt conveying device according to claim 1, characterized in that: A jacket is provided between the second sub-portion and the inner wall of the cavity.

6. The melt conveying device according to claim 1, characterized in that: The valve core control rod moves axially in the cavity.

7. The melt conveying device according to claim 1, characterized in that: The valve core is provided with a mounting hole at the top end.

8. The melt conveying device according to claim 1, characterized in that: The melt channel is a smooth curved surface.

9. The melt conveying device according to claim 1, characterized in that: The valve seat is provided with a through hole which is communicated with the discharge channel.

10. A resin online modification molding equipment, characterized in that: It comprises the melt conveying device according to any one of claims 1 to 9, and also comprises a modification system, a storage and injection system, and a mold, wherein the modification system comprises an extruder, and the storage and injection system comprises an injection cylinder, a storage cylinder, and a nozzle.

11. The resin online modification molding equipment according to claim 10, characterized in that: The through holes are respectively connected to the material storage cylinder and the nozzle.

12. The resin online modification molding equipment according to claim 10, characterized in that: The extruder is distributed in parallel with the storage cylinder, and the position of the extruder is higher than that of the storage cylinder.

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