Melt reversing device and on-line resin modification forming equipment with same

Abstract

The utility model belongs to the field of plastic forming processing, and particularly relates to a melt reversing device and on-line resin modification forming equipment with the same, the melt reversing device comprises a sealing needle, a base, a first channel and a second channel, the base is provided with a mounting groove for mounting the sealing needle, and the first channel and the second channel are communicated in the base; the side wall or the end of the sealing needle slides relative to the base to block the space where the first channel and the second channel are communicated, so that the first channel and the second channel are blocked or communicated, and the melt flows in different directions according to different working stages. According to the melt reversing device, a sliding valve element is omitted, so that the structure is simple, the situation that the melt reversing function fails due to the fact that the valve element is stuck due to material leakage is avoided, the replacement and cleaning time is saved in actual production, and the production efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of plastic processing, and specifically relates to a melt commutation device and a resin online modification molding device with such a structure. Background Art

[0002] Resin modification refers to changing the molecular structure or chemical properties of resin through 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, blow molding, etc. Based on the improvement of the LFT-D (Long Fiber Reinforced Thermoplastic Composite Direct Molding Process) technology, the prior art has proposed a resin online modification molding device, which integrates the modification and molding of plastics, improving the quality and performance of plastic products.

[0003] In the existing resin online modification molding device, in order to realize the continuous production of the device, an overflow device is provided between the molding system and the modification system. The function of this overflow device is that when the molding device is working, the melt of the modification system cannot enter the molding system, avoiding excessive pressure inside the device, and thus discharging the melt through the overflow device. In addition, the storage function of the molding system of the device is limited, and it is necessary to control the conversion between the storage function and the injection function of the molding system. That is to say, when the storage of the molding system is full, it needs to enter the injection stage. At this time, it is necessary to block the modification system and the molding system to prevent the melt from the modification system from continuing to enter the molding system.

[0004] The basic principles of the above-mentioned overflow device and the device with a storage-injection conversion function are both to change the flow direction of the melt. Therefore, in the prior art, a sliding spool structure is adopted for these two key parts. Different channels are provided inside the sliding spool, and the movement of the spool enables the melt to enter different channels, so as to block the melt or change the flow direction of the melt to achieve different working stages.

[0005] Although the sliding spool in the prior art can realize the function of melt commutation, its structure design is complex, the processing difficulty is high, and it is extremely easy to leak material at the spool sliding part. Affected by the melt viscosity, the leakage of material causes the spool to be stuck, and thus the device cannot exert its due melt commutation function. It is extremely inconvenient to replace and clean in actual production, affecting production efficiency. Therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] In order to overcome the defects in the prior art that the sliding spool structure is complex and easy to leak material, resulting in the failure of the melt commutation device function, the purpose of this application is to provide a device with a simple structure, not easy to leak material, and maintaining the melt commutation function during the working process. Specifically, it is realized through the following technical solutions:

[0007] A melt commutation device includes a sealing needle, a base, a first channel, and a second channel. An installation groove for installing the sealing needle is provided on the base. The first channel and the second channel communicate with each other inside the base. The side wall or end of the sealing needle blocks the space where the first channel and the second channel communicate through relative sliding with the base, so that the first channel and the second channel are blocked or communicated, and thus the melt flows in different directions according to different working stages.

[0008] Optionally, a jacket is provided between the sealing needle and the installation groove, and a clamping portion is provided at one end of the jacket outside the base.

[0009] Optionally, the length of the jacket is equal to the depth of the installation groove.

[0010] Optionally, the first channel and the second channel are vertically arranged in the same plane.

[0011] Optionally, the radial distance of the sealing needle is less than the radial distance of the first channel.

[0012] Optionally, the end of the sealing needle is adapted to the side wall of the first channel to reduce the influence on the performance of the melt flowing in the first channel.

[0013] Optionally, the first channel and the second channel are vertically arranged in different planes.

[0014] Optionally, a circulation hole corresponding to and adapted to the second channel is provided on the side wall of the jacket.

[0015] Optionally, the end of the sealing needle is an inclined curved surface.

[0016] This application also provides a resin on-line modification and molding device, which includes a modification system, a molding system, and also includes the melt commutation device described in any one of the above. The melt commutation device is located between the modification system and the molding system. The molding system includes a storage cylinder and a nozzle.

[0017] Optionally, the resin on-line modification and molding device includes a first melt commutation device and a second melt commutation device. When the sealing needle of the second melt commutation device slides outward to the outside of the base, the first channel and the second channel are communicated, and the melt in the modification system enters the molding system through the first channel and the second channel. When the sealing needle slides inward to the inside of the base to block the communication between the first channel and the second channel, the melt enters the molding working state, playing the role of melt conversion. At this time, the modification system is still in the working stage. To relieve the melt pressure in the resin on-line modification and molding device, the melt discharges the excess melt through the second channel of the first melt commutation device, playing the role of overflow.

[0018] Compared with the prior art, the present application has the following beneficial effects: eliminating the sliding spool simplifies the structure, avoiding the failure of the melt commutation function caused by the spool jamming due to material leakage, saving the time for replacement and cleaning in actual production, and improving the production efficiency. Description of the Drawings

[0019] Figure 1 Schematic structural diagram of the melt commutation device described in Embodiment 1;

[0020] Figure 2 Schematic cross-sectional structural diagram of the melt commutation device described in Embodiment 1;

[0021] Figure 3 Schematic structural diagram of the melt commutation device described in Embodiment 2;

[0022] Figure 4 Schematic cross-sectional structural diagram of the melt commutation device described in Embodiment 2;

[0023] Figure 5 Schematic structural diagram of the sealing needle and jacket of the melt commutation device described in Embodiment 2;

[0024] Figure 6 Schematic diagram of the resin in-line modification and molding equipment described in Embodiment 3;

[0025] In the figure, the reference numerals are:

[0026] 1 - Melt commutation device, 11 - First melt commutation device, 12 - Second melt commutation device, 2 - Sealing needle, 21 - End portion, 3 - Base, 4 - First channel, 5 - Second channel, 6 - Installation groove, 7 - Jacket, 71 - Flow hole, 72 - Clamping portion, 8 - Modification system, 9 - Molding system, 91 - Storage cylinder, 92 - Nozzle. Detailed Embodiments

[0027] The following elaborates on the detailed embodiments of the present application through examples. Additionally, it should be noted that the name of the melt commutation device varies depending on its location, but this does not affect the structure of the present application. Moreover, the first and second in the present application are not specific designations, merely used to distinguish different structures and should not be construed as limitations to the present application. Common structures in the device, such as the power device, are not elaborated in the following embodiments, and those skilled in the art should understand. The specific implementation of the present application does not limit the technical solution of the present application. Any non-substantive changes such as replacing common technical solutions in the art using the technical solutions described in the embodiments of the present application fall within the protection scope of the present application.

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2The melt commutation device 1 shown includes a sealing needle 2, a base 3, a first channel 4, and a second channel 5. An installation groove 6 for installing the sealing needle 2 is provided on the base 3. The first channel 4 and the second channel 5 communicate with each other inside the base 3. The side wall or end 21 of the sealing needle 2 blocks the space where the first channel 4 and the second channel 5 communicate through relative sliding with the base 3, so that the first channel 4 and the second channel 5 are blocked or communicated, and thus the melt flows in different directions according to different working stages. The end 21 of the sealing needle 2 is located inside the base 3.

[0030] A jacket 7 is provided between the sealing needle 2 and the installation groove 6. The jacket 7 is provided with a clamping portion 72 at one end outside the base 3. The presence of the jacket 7 can protect the long-term use of the sealing needle 2, and at the same time increase the sealing performance to prevent the problem of melt leakage through the contact gap between the sealing needle 2 and the installation groove 6. The jacket 7 is further fixed through the clamping portion 72 to prevent the jacket 7 from entering the melt channel due to the movement of the sealing needle 2 during operation, thereby affecting the operation of the equipment. In other embodiments, the jacket 7 may also be selected not to be used, and the functions of the device involved in the present application can also be realized.

[0031] The length of the jacket 7 is equal to the depth of the installation groove 6. When the length of the jacket 7 is less than the depth of the installation groove 6, stock will be generated at the through hole, affecting production. When the length of the jacket 7 is greater than the depth of the installation groove 6, it will hinder the flow of the melt in the channel.

[0032] In this embodiment, the first channel 4 and the second channel 5 are vertically arranged in the same plane. In other embodiments, the first channel 4 and the second channel 5 may also have other relative position relationships. For example, the first channel 4 and the second channel 5 are of irregular shapes and do not have a vertical position relationship, as long as the above effects can be achieved.

[0033] The radial distance of the sealing needle 2 is less than the radial distance of the first channel 4. That is to say, when the sealing needle 2 is in the forward state, it will not affect the flow of the melt in the first channel 4.

[0034] The end 21 of the sealing needle 2 is adapted to the side wall of the first channel 4 to reduce the impact on the performance of the melt flowing in the first channel 4.

[0035] In this embodiment, the sealing needle 2 is detachably connected to the through hole. If the function of this module fails during operation, only the nested structure needs to be replaced, rather than the whole, so as to achieve the purpose of reducing costs. The whole or part of the material of the sealing needle 2 uses steel to improve the reliability of the overall operation of the equipment.

[0036] The detailed working process of this embodiment is described below:

[0037] The melt commutation device 1 operates in two modes. When it functions as an overflow device, the first channel 4 connects the modification system 8 and the molding system 9, and the second channel 5 connects the first channel 4 and the outside. When the sealing pin 2 is in the forward state, the end 21 located inside the base 3 blocks the second channel 5. At this time, the melt from the modification system 8 flows through the first melt channel and enters the material storage stage of the molding system 9. When the sealing pin 2 is in the retracted state, the second channel 5 is connected to the first channel 4 to form an unobstructed state. At this time, the molding system 9 is performing the injection operation, and the melt from the modification system 8 cannot enter the molding system 9. The melt in the first channel 4 will enter the second channel 5 under the pressure inside the device, thereby discharging the device to achieve the overflow function.

[0038] When it functions as a melt conversion device, the first channel 4 connects the material storage cylinder 91 and the nozzle 92 in the molding system 9, and the second channel 5 connects the first channel 4 and the modification system 8. When the sealing pin 2 is in the forward state, the end 21 located inside the base 3 blocks the second channel 5, and the melt is injection molded through the first channel 4. The melt from the modification system 8 cannot enter the molding system 9. When the sealing pin 2 is in the retracted state, the first channel 4 is connected to the second channel 5, and the melt from the modification system 8 flows into the first channel 4 through the second channel 5 and then enters the material storage cylinder 91 to achieve the material storage function. With the switching of different states of the sealing pin 2, the storage and injection conversion effect is achieved.

[0039] Embodiment 2

[0040] As Figure 3 、 Figure 4 and Figure 5 shown in the embodiments, the same parts as in Embodiment 1 will not be described in detail. The difference is that in this embodiment, the first channel 4 and the second channel 5 are vertically arranged in different planes, and the melt will pass through the communication space inside the base 3 when flowing from the first channel 4 to the second channel 5.

[0041] A flow hole 71 corresponding to and adapted to the second channel 5 is provided on the side wall of the jacket 7. In other embodiments, it is also possible to choose not to use the jacket 7.

[0042] The end 21 of the sealing pin 2 is an inclined curved surface, which provides a buffering effect for the flowing melt and reduces the influence of the device structure on the melt properties.

[0043] The detailed working process of the melt commutation device 1 is the same as that in Embodiment 1 and will not be described in detail. The difference is that whether it functions as an overflow device or a melt conversion device, when the sealing pin 2 is in the forward state, the second channel 5 is blocked by the side wall of the sealing pin 2. Of course, in other embodiments, it is also possible to choose the position where the end 21 of the sealing pin 2 blocks the side wall communication of the first channel 4, as long as the communication between the first channel 4 and the second channel 5 is disconnected. Those skilled in the art should understand.

[0044] Embodiment 3

[0045] As Figure 6 shown, a resin on-line modification and molding device includes a modification system 8 and a molding system 9, and further includes the melt commutation device 1 described in Embodiment 1 or Embodiment 2. The melt commutation device 1 is located between the modification system 8 and the molding system 9. The molding system 9 includes a storage cylinder 91 and a nozzle 92.

[0046] The resin on-line modification and molding device includes a first melt commutation device 111 and a second melt commutation device 121. When the sealing needle 2 of the second melt commutation device 121 slides outward of the base 3, that is, when the sealing needle 2 retracts, the first channel 4 is communicated with the second channel 5. The melt in the modification system 8 enters the molding system 9 through the first channel 4 and the second channel 5. When the sealing needle 2 slides inward of the base 3, that is, when the sealing needle 2 advances, the communication between the first channel 4 and the second channel 5 is blocked, and the melt enters the molding working state, playing the role of melt conversion. At this time, the modification system 8 is still in the working stage. To relieve the melt pressure in the resin on-line modification and molding device, the melt discharges the excess melt through the second channel 5 of the first melt commutation device 111, playing the role of overflow. In other embodiments, it is also possible to choose to use only the first melt commutation device 111 or only the second melt commutation device 121.

Claims

1. A melt reversing device, characterized in that: It includes a sealing needle, a base, a first channel, and a second channel. The base is provided with a mounting groove for mounting the sealing needle. The first channel and the second channel are connected inside the base. The side wall or end of the sealing needle blocks the space connecting the first channel and the second channel by relative sliding with the base, so that the first channel and the second channel are blocked or connected so that the melt flows to different directions according to different working stages.

2. The melt reversing device according to claim 1, characterized in that: A jacket is arranged between the sealing needle and the mounting groove, and a clamping portion is arranged at one end of the jacket outside the base.

3. The melt reversing device according to claim 2, characterized in that: The length of the jacket is equal to the depth of the mounting groove.

4. The melt reversing device according to claim 2, characterized in that: The first channel and the second channel are located in the same plane and are arranged vertically.

5. The melt reversing device according to claim 4, characterized in that: The sealing needle radial distance is smaller than the first channel radial distance.

6. The melt reversing device according to claim 4, characterized in that: The end of the sealing needle is matched with the side wall of the first channel to reduce the influence on the performance of the melt flowing in the first channel.

7. The melt reversing device according to claim 2, characterized in that: The first channel and the second channel are located in different planes and are vertically arranged.

8. The melt reversing device according to claim 7, characterized in that: The side wall of the jacket is provided with a flow hole corresponding to and matching the second channel.

9. The melt reversing device according to claim 7, characterized in that: The end of the sealing needle is an inclined curved surface.

10. A resin online modification and molding equipment, comprising a modification system and a molding system, characterized in that: It also includes the melt reversing device according to any one of claims 1 to 9, wherein the melt reversing device is located between the modification system and the molding system, and the molding system includes a storage cylinder and a nozzle.

11. The resin online modification molding equipment according to claim 10, characterized in that: The resin online modification and molding equipment comprises a first melt reversing device and a second melt reversing device. When the sealing needle of the second melt reversing device slides toward the outside of the base, the first channel is connected with the second channel, and the melt in the modification system enters the molding system through the first channel and the second channel. When the sealing needle slides toward the inside of the base to block the connection between the first channel and the second channel, the melt enters the molding working state, playing the role of melt conversion. At this time, the modification system is still in the working stage. In order to relieve the melt pressure in the resin online modification and molding equipment, the melt discharges excess melt through the second channel of the first melt reversing device, playing an overflow role.

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