One-way valve, melt conveying system and resin online modification forming equipment

Abstract

The utility model discloses a one-way valve, a melt conveying system and on-line resin modification forming equipment, and belongs to the field of plastic forming processing, the one-way valve comprises a valve seat and a valve body, and is characterized by further comprising a fixing chuck, a pressing disc, a clamping sleeve, a sealing needle, a feeding port, a buffering port, a melt channel and a valve port, the valve seat is provided with a through hole, the valve port is connected with the melt channel, and the valve body is provided with a through hole. When the sealing needle is tightly attached to the valve port, melt cannot pass through the valve port, the outer diameter of the sealing needle is smaller than the inner diameter of the melt channel, the sealing needle can move in the valve body, and the feeding port corresponds to the tail end of the clamping sleeve. Therefore, the reliability of equipment operation is improved.

Description

Technical Field

[0001] The present invention belongs to the field of plastic processing, and particularly relates to a one-way valve, a melt conveying system, and an on-line resin modification and 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, and mechanical properties. 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 modification and molding device is proposed. The device has an extruder, a molding machine, and a melt conveying system. This device not only has the advantages of realizing one-time heating for plastic modification and molding, reducing the damage to the plastic molecular structure, and improving the quality and performance of plastic products, but also can modify and mold thermoplastic plastics with a relatively high melting point and a relatively fast cold crystallization rate, improving the production efficiency while expanding the application range of the on-line molding technology.

[0004] The above device can achieve the purpose of on-line molding, but the structure it adopts still has deficiencies. Plastic modification and molding are two different processes. During the modification process, its complex structure design is not conducive to replacing the extruder screw. When the melt enters the molding process after extrusion, the general movable valve core structure leaks material, resulting in the valve core being stuck and the injection transfer failing, increasing the maintenance cost. Summary of the Invention

[0005] In order to overcome the problems of complex valve core structure and easy material leakage in the prior art, the purpose of the present invention is to provide a one-way valve with a simple structure and avoiding material leakage, which is specifically realized through the following technical solutions:

[0006] A one-way valve includes a valve seat, a valve body, a fixed chuck, a pressure plate, a jacket, a sealing needle, a feed port, a buffer port, a melt channel, and a valve port. The valve seat is provided with a through hole. The valve port is connected to the melt channel. When the sealing needle is in close fit with the valve port, the melt cannot pass through the valve port. The outer diameter of the sealing needle is smaller than the inner diameter of the melt channel, and it can move within the valve body. The feed port corresponds to the end position of the jacket.

[0007] Optionally, the sealing needle is provided with a jacket at the connection with the valve body.

[0008] Optionally, the feed port and the buffer port are at the same horizontal position.

[0009] Optionally, one end of the sealing needle close to the second valve port is conical.

[0010] Optionally, the sealing needle moves axially along the melt channel.

[0011] This application also provides a melt conveying system, including the one-way valve described above, and further including a buffer system, the buffer system including a buffer cylinder and a buffer oil cylinder.

[0012] Optionally, the buffer cylinder is connected to the buffer port.

[0013] Optionally, the buffer cylinder is provided with an overflow port.

[0014] This application also provides a resin on-line modification and molding device, including the melt conveying system described above, and further including an extruder, a mold, a nozzle, a storage cylinder, and an injection oil cylinder.

[0015] Optionally, the extruder and the buffer cylinder are distributed on the same horizontal plane, and the buffer cylinder and the storage cylinder are distributed in the same vertical plane.

[0016] The working principle of the one-way valve and the resin on-line modification and molding device of this application is as follows: The extruder feeds the modified melt into the one-way valve through the feed port. During the storage process, the sealing needle is lifted by the power device, and the buffer cylinder, the extruder, and the storage cylinder are connected. The melt from the extruder and the buffer cylinder enters the storage cylinder through the melt channel. The direction of the nozzle depends on the sealing effect of the mold runner, and the melt will not flow towards the nozzle direction. After the storage is completed, the sealing needle is pressed down by the power device to block the connection between the buffer cylinder and the storage cylinder, and the injection of the melt starts. At this time, the sealing needle and the valve port are completely closed to prevent the melt from flowing back into the buffer cylinder. At the same time, the melt from the extruder enters the buffer cylinder. When the buffer cylinder is full of melt, the excess melt will overflow through the overflow port to avoid excessive pressure at the head of the machine, without the need for additional mechanical actions of the equipment, and the reliability of the equipment is higher.

[0017] Compared with the prior art, this application has the following beneficial effects: The structure is simple, avoiding the problem of material leakage, eliminating the original movable valve structure, avoiding the problem of material leakage of the valve core causing the valve core to be stuck and the storage and injection conversion to fail, and improving the reliability of the equipment operation. Description of the Drawings

[0018] Figure 1 Schematic diagram of the one-way valve described in Embodiment 1;

[0019] Figure 2 Cross-sectional structure schematic diagram of the one-way valve described in Embodiment 1;

[0020] Figure 3 Schematic diagram of the structure of the conveying system described in Embodiment 2;

[0021] Figure 4Schematic cross-sectional structure diagram of the conveying system described in Embodiment 2;

[0022] Figure 5 Schematic structure diagram of the on-line resin modification and molding described in Embodiment 3.

[0023] In the figure, the reference numerals are: 1 - valve seat, 2 - valve body, 3 - fixed chuck, 4 - pressure plate, 5 - jacket, 6 - sealing needle, 7 - feed port, 8 - buffer port, 9 - melt channel, 10 - valve port, 11 - through hole, 12 - buffer cylinder, 13 - buffer oil cylinder, 14 - overflow port, 15 - extruder, 16 - mold, 17 - nozzle, 18 - storage cylinder, 19 - injection oil cylinder, 20 - hydraulic cylinder. Detailed implementation manners

[0024] 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 solutions 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. Embodiment

[0025] Such as Figure 1 、 Figure 2 shown, a one-way valve includes a valve seat 1 and a valve body 2, and further includes a fixed chuck 3, a pressure plate 4, a jacket 5, a sealing needle 6, a feed port 7, a buffer port 8, a melt channel 9, and a valve port 10. The valve seat 1 is provided with a through hole 11. The valve port 10 is connected to the melt channel 9. When the sealing needle 6 is in close fit with the valve port 10, the melt cannot pass through the valve port 10. The outer diameter of the sealing needle 6 is smaller than the inner diameter of the melt channel 9, and it can move within the valve body 2. The feed port 7 corresponds to the end position of the jacket 5.

[0026] In this embodiment, the sealing needle 6 is provided with a jacket 5 at the connection with the valve body 2. The combined use of the sealing needle 6 and the jacket 5 prevents the occurrence of material leakage and improves the reliability of the equipment.

[0027] In this embodiment, the feed port 7 and the buffer port 8 are at the same horizontal position to prevent the melt from entering the buffer cylinder 12 during the storage process.

[0028] In this embodiment, one end of the sealing needle 6 close to the valve port 10 is conical, reducing the influence on the melt components due to the shape of the sealing needle. In other embodiments, other shapes such as an arc structure can also be adopted.

[0029] In this embodiment, the sealing needle 6 moves axially along the melt channel 9.

[0030] In this embodiment, the power device uses a hydraulic cylinder 20. In other embodiments, other power devices can also be used to achieve the movement of the sealing needle 6. Embodiment

[0031] As shown in Figure 3 , Figure 4 a melt conveying system, which includes the check valve described in Embodiment 1, and further includes a buffer system. The buffer system includes a buffer cylinder 12 and a buffer oil cylinder 13. The structure of the check valve is the same as that described in Embodiment 1 and will not be elaborated here. In this embodiment, the buffer cylinder 12 is connected to the buffer port 8, and the buffer cylinder 12 is provided with an overflow port 14, so that no additional mechanical action is required for the equipment to prevent the melt from filling the buffer cylinder 12 and causing excessive pressure at the head. Embodiment

[0032] As shown in Figure 5 a resin on-line modification and molding device, which includes the melt conveying system described in Embodiment 2, and further includes an extruder 15, a mold 16, a nozzle 17, a storage cylinder 18, and an injection oil cylinder 19. In this embodiment, the extruder 15 and the buffer cylinder 12 are distributed on the same horizontal plane, and the buffer cylinder 12 and the storage cylinder 18 are distributed in the same vertical plane, optimizing the structural arrangement and design of the equipment and improving the problem of difficult screw replacement.

[0033] Among them, the power structure, heating and heat preservation system, cooling system, part ejection system, etc. that should be included in the mold in this embodiment can be understood by those skilled in the art based on their experience on how to implement them, and do not belong to the key points described in this application, so they will not be elaborated here.

[0034] 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 one-way valve, comprising a valve seat and a valve body, characterized in that: It also includes a fixed chuck, a pressure plate, a jacket, a sealing needle, a feed port, a buffer port, a melt channel, and a valve port. The valve seat is provided with a through hole, and the valve port is connected to the melt channel. When the sealing needle is tightly fitted to the valve port, the melt cannot pass through the valve port. The outer diameter of the sealing needle is smaller than the inner diameter of the melt channel and can move within the valve body. The feed port corresponds to the end position of the jacket.

2. The one-way valve according to claim 1, characterized in that: The jacket is located at the connection between the sealing needle and the valve body.

3. The one-way valve according to claim 1, characterized in that: The feed port and the buffer port are located at the same horizontal position.

4. The one-way valve according to claim 1, characterized in that: One end of the sealing needle close to the second valve port is in a cone shape.

5. The one-way valve according to claim 1, characterized in that: The sealing needle moves axially along the melt channel.

6. A melt delivery system, characterized in that: It comprises the one-way valve according to any one of claims 1 to 5, and also comprises a buffer system, wherein the buffer system comprises a buffer cylinder and a buffer oil cylinder.

7. The melt delivery system according to claim 6, characterized in that: The buffer cylinder is connected to the buffer port.

8. The melt delivery system according to claim 6, characterized in that: The buffer cylinder is provided with an overflow port.

9. A resin online modification molding equipment, characterized in that: The melt delivery system comprises the melt delivery system as described in claim 7, and further comprises an extruder, a mold, a nozzle, a storage cylinder, and an injection cylinder.

10. The resin online modification molding equipment according to claim 9, characterized in that: The extruder and the buffer cylinder are distributed on the same horizontal plane, and the buffer cylinder and the material storage cylinder are distributed on the same vertical plane.

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