Thermoplastic raw material foaming forming device for recovering PET (polyethylene terephthalate) to produce chemical fiber products

Abstract

The invention relates to the technical field of plastic waste recycling, in particular to a thermoplastic raw material foaming forming device for recycling PET to produce chemical fiber products, which comprises a rack, a melting foaming box is fixed on the rack, a stirring mechanism is arranged in the melting foaming box, and a plurality of air nozzles are distributed and mounted at the top of the melting foaming box at equal intervals; a foaming agent storage tank and a booster pump are further fixedly arranged on the rack, the inlet end of the booster pump is communicated with the foaming agent storage tank through a liquid inlet pipeline, the outlet end of the booster pump is connected with a plurality of branch pipes through a liquid outlet main pipeline, and the branch pipes are communicated with the corresponding air nozzles respectively; according to the invention, the valve rods of the air nozzles are sequentially shifted by the high-position shifting plate and the low-position shifting plate on the sliding seat, so that alternate opening and closing and sequential air injection of the multiple air nozzles are realized, and melt flow field turbulence and system pressure pulsation caused by simultaneous injection of multiple air flows are effectively avoided; therefore, the dispersion uniformity and the foaming quality of the foaming agent in the recycled PET melt are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of plastic waste recycling technology, specifically a foaming molding device for recycling thermoplastic raw materials from PET to produce chemical fiber products. Background Technology

[0002] PET, chemically known as polyethylene terephthalate, is an important thermoplastic polymer. Its products, especially beverage bottles, are consumed in huge quantities, resulting in a large amount of waste PET. To achieve energy conservation and environmental protection, it is particularly important to recycle and utilize waste PET. Recycling PET into thermoplastic raw materials with microporous structures through physical foaming processes, and then producing chemical fiber products such as down-like materials and thermal insulation filling materials, is one of the effective ways to upgrade and recycle PET.

[0003] In this physical foaming process, the core step is to efficiently and uniformly disperse and dissolve the foaming agent in the PET melt to form a homogeneous polymer-gas solution. Then, controlled nucleation and foaming are initiated by depressurization. Existing autoclave foaming devices typically place the molten polymer in a sealed high-pressure container and inject the foaming agent simultaneously at one or more points, then rely on mechanical stirring to achieve dispersion. However, this method has obvious limitations. Single-point injection results in a limited contact area between the gas and the melt, a long diffusion path, and low mixing efficiency. If multiple nozzles are used to inject high-pressure gas into the melt simultaneously, strong local pressure and flow field disturbances will be generated near multiple injection points. These disturbances interfere with each other, leading to a chaotic flow field in the melt, which is not conducive to the uniform distribution of gas in the macroscopic range. At the same time, the simultaneous opening of multiple high-pressure gas lines will cause severe instantaneous load and pressure pulsation on the gas source system, affecting the stability and accuracy of the foaming agent metering, thus making it difficult to obtain cells with uniform pore size and regular structure.

[0004] To address these issues, we provide a thermoplastic raw material foaming and molding apparatus for recycling PET to produce chemical fiber products. Summary of the Invention

[0005] The purpose of this invention is to provide a foaming and molding apparatus for recycling PET to produce chemical fiber products, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A thermoplastic raw material foaming molding device for recycling PET to produce chemical fiber products includes a frame, a melt foaming box fixed on the frame, a stirring mechanism inside the melt foaming box, and multiple air nozzles evenly distributed on the top of the melt foaming box. The frame is also fixedly equipped with a foaming agent storage tank and a booster pump. The inlet end of the booster pump is connected to the foaming agent storage tank through a liquid inlet pipe, and the outlet end of the booster pump is connected to multiple branch pipes through a liquid outlet main pipe. Each branch pipe is connected to a corresponding jet nozzle. A valve body is fixedly installed on each of the branch pipes, a valve stem is rotatably installed on the valve body, and a valve core for opening and closing the internal air passage of the valve body is fixed on the valve stem. A sliding seat is slidably mounted on the frame in the horizontal direction, and a low-position lever and a high-position lever are fixed on the sliding seat from right to left. A main shaft is also rotatably mounted on the frame, and the main shaft is connected to the drive end of the stirring mechanism, the sliding seat, and the drive end of the booster pump through a linkage mechanism. When the main shaft rotates in the first direction, the linkage mechanism synchronously drives the stirring mechanism to run, drives the booster pump to run, and drives the sliding seat to move horizontally, so that the low-position dial plate and the high-position dial plate can alternately move each valve rod to swing, thereby alternately opening multiple valve bodies. When the main shaft rotates in a second direction opposite to the first direction, the sliding seat is driven to move horizontally and reset through the linkage mechanism, and at this time neither the stirring mechanism nor the booster pump is running.

[0007] A thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET, as described above: the stirring mechanism includes a stirring shaft rotatably mounted on a melt foaming box, and stirring blades located inside the melt foaming box are fixedly mounted on the stirring shaft.

[0008] A thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET, as described above: the linkage mechanism includes a pump shaft connected to the impeller of a booster pump and a lead screw rotatably mounted on a frame; the sliding seat is threadedly connected to the lead screw; the frame is provided with a limiting component for the movement of the sliding seat; the main shaft cooperates with the pump shaft, lead screw, and stirring shaft through a transmission mechanism; when the main shaft rotates in a first direction, the lead screw, pump shaft, and stirring shaft are synchronously driven to rotate through the transmission mechanism; when the main shaft rotates in a second direction opposite to the first direction, the lead screw is driven to rotate in the opposite direction through the transmission mechanism, and at this time, neither the pump shaft nor the stirring shaft rotates.

[0009] The above-described thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET: a motor is fixedly installed on the frame, and the output end of the motor is connected to the main shaft through a coupling to drive the main shaft to rotate.

[0010] A thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET, as described above: the limiting component includes two guide rods symmetrically distributed on both sides of the lead screw and fixed on the frame, the guide rods passing through the sliding seat.

[0011] A thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET, as described above: the transmission mechanism includes a main shaft pulley fixed on the main shaft and a screw pulley fixed on the screw rod, and the main shaft pulley and the screw pulley are driven by a transmission belt; A drive shaft is rotatably mounted on the frame. The main shaft and the drive shaft are connected by a one-way transmission mechanism. When the main shaft rotates in a first direction, it drives the drive shaft to rotate. When the main shaft rotates in a second direction opposite to the first direction, the drive shaft does not rotate. The drive shaft is connected to the stirring shaft and the pump shaft via a pulley mechanism. When the drive shaft rotates, it drives the stirring shaft and the pump shaft to rotate synchronously.

[0012] As described above, a thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET includes: a drive gear rotatably mounted on the frame, a driven gear fixed on the transmission shaft and meshing with the drive gear, and a ratchet fixed on the main shaft; a pawl hinged to the drive gear and engaging with the ratchet teeth; and a reset spring fixed to one side of the drive gear for applying a preload to the pawl.

[0013] The above-described thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET: the pulley mechanism includes a pump shaft pulley fixed on the pump shaft, a transmission shaft pulley fixed on the transmission shaft, and a stirring shaft pulley fixed on the stirring shaft, wherein the pump shaft pulley, the transmission shaft pulley, and the stirring shaft pulley are driven by a linkage belt.

[0014] A thermoplastic raw material foaming molding device for producing chemical fiber products from recycled PET, as described above: a feed hopper for adding raw materials into the melt foaming box is fixedly installed on the frame and communicates with the melt foaming box; a discharge valve is fixedly installed at the bottom of the melt foaming box.

[0015] As described above, a thermoplastic raw material foaming molding device for recycling PET to produce chemical fiber products: When the sliding seat slides horizontally, it first drives the valve rod to deflect 45° through the low-position deflector plate, which drives the valve core to rotate synchronously by 45°, so that the air passage of the valve body switches from the closed state to the fully open state; then, the sliding seat continues to move, and drives the valve rod to deflect to 90° through the high-position deflector plate, which drives the valve core to rotate synchronously to 90°, so that the air passage of the valve body switches from the fully open state to the closed state again.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention uses multiple jet nozzles arranged at equal intervals along the top of the molten foaming box and a drive system composed of a main shaft and a linkage mechanism to control the valves connected to these jet nozzles to open sequentially and alternately, rather than simultaneously. This method effectively avoids the mutual interference and pressure conflict of the flow field when multiple high-pressure gas jets are injected into the melt at the same time, so that the foaming agent can be injected in a more orderly manner at multiple points and in stages. Combined with the synchronous operation of the stirring mechanism composed of the stirring shaft and stirring blades, the foaming agent can be dispersed and mixed immediately after local enrichment is formed at the injection point, which greatly shortens the macroscopic diffusion path and saturation homogenization time of the foaming agent in the melt, thus facilitating the formation of an ideal cell structure with uniform size and fine distribution. (2) The present invention uses a single drive source motor to drive the main shaft. Through the linkage mechanism, the three process actions of stirring the melt inside the molten foaming box, pumping the foaming agent by the booster pump, and alternating opening and closing of the multi-way valve are mechanically coupled together. Compared with the complex fully automatic continuous production line, the mechanical linkage scheme of this device eliminates multiple independent servo drive units and complex collaborative control programs. The structure is relatively simple, making the manufacturing, debugging, operation and subsequent maintenance of the equipment more convenient and economical. It is particularly suitable for customized production or R&D test scenarios with small and medium batches and multiple varieties. (3) The present invention uses a sliding seat with a low-position and a high-position lever to drive the valve stem to swing in two 45° stages. This design enables alternating, precise and rapid switching control of the gas path of each valve body. Combined with the synchronous operation of the booster pump and the avoidance of the impact of multiple simultaneous openings on the gas source system, it ensures the accuracy and consistency of the gas metering in each jet cycle, providing a foundation for stable foaming. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a thermoplastic raw material foaming and molding device for producing chemical fiber products from recycled PET.

[0018] Figure 2 for Figure 1 A schematic diagram of the decomposed part of the structure.

[0019] Figure 3 for Figure 2 A structural diagram from another perspective.

[0020] Figure 4 for Figure 2 A schematic diagram of the decomposed part of the structure.

[0021] Figure 5 for Figure 4 A structural diagram from another perspective.

[0022] Figure 6 for Figure 4 A schematic diagram of the decomposed part of the structure.

[0023] Figure 7 for Figure 6 A schematic diagram of the decomposed part of the structure.

[0024] Figure 8 for Figure 7 A schematic diagram of the decomposed part of the structure.

[0025] Figure 9 for Figure 6 A schematic diagram of the decomposed part of the structure.

[0026] Figure 10 for Figure 9 A schematic diagram of the decomposed part of the structure.

[0027] In the diagram: 1. Frame; 2. Melt foaming tank; 3. Stirring shaft; 4. Stirring blade; 5. Air nozzle; 6. Foaming agent storage tank; 7. Booster pump; 8. Inlet pipe; 9. Outlet main pipe; 10. Branch pipe; 11. Valve body; 12. Valve stem; 13. Valve core; 14. Sliding seat; 15. Low position lever; 16. High position lever; 17. Lead screw; 18. Guide rod; 19. Main shaft; 20. Motor; 21. Main shaft pulley; 22. Lead screw pulley; 23. Drive belt; 24. Pump shaft; 25. Drive shaft; 26. Pump shaft pulley; 27. Drive shaft pulley; 28. Stirring shaft pulley; 29. ​​Linkage belt; 30. Drive gear; 31. Driven gear; 32. Ratchet; 33. Pad; 34. Return spring; 35. Feed hopper. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Please see Figures 1-10 As an embodiment of the present invention, a thermoplastic raw material foaming molding device for recycling PET to produce chemical fiber products includes a frame 1, a melt foaming box 2 fixed on the frame 1, a stirring mechanism inside the melt foaming box 2, and multiple air nozzles 5 evenly distributed on the top of the melt foaming box 2. The frame 1 is also fixedly equipped with a foaming agent storage tank 6 and a booster pump 7. The inlet end of the booster pump 7 is connected to the foaming agent storage tank 6 through the liquid inlet pipe 8, and the outlet end of the booster pump 7 is connected to multiple branch pipes 10 through the liquid outlet main pipe 9. Each branch pipe 10 is connected to the corresponding jet nozzle 5. Each branch pipe 10 is fixedly installed with a valve body 11, a valve stem 12 is rotatably installed on the valve body 11, and a valve core 13 for opening and closing the internal air passage of the valve body 11 is fixed on the valve stem 12. A sliding seat 14 is slidably mounted on the frame 1 in the horizontal direction. A low position dial 15 and a high position dial 16 are fixed on the sliding seat 14 from right to left. A main shaft 19 is also rotatably mounted on the frame 1. The main shaft 19 is connected to the drive end of the stirring mechanism, the sliding seat 14 and the drive end of the booster pump 7 through a linkage mechanism. When the main shaft 19 rotates in the first direction, the linkage mechanism synchronously drives the stirring mechanism to run, drives the booster pump 7 to run, and drives the sliding seat 14 to move horizontally, so that the low-position dial plate 15 and the high-position dial plate 16 can alternately dial each valve rod 12 to swing, thereby alternately opening multiple valve bodies 11. When the main shaft 19 rotates in the second direction opposite to the first direction, the sliding seat 14 is driven to move horizontally and reset through the linkage mechanism, and at this time neither the stirring mechanism nor the booster pump 7 is running.

[0030] In this embodiment, during use, the recycled PET raw material is first crushed and added to the melt foaming tank 2 and heated to a molten state. When it is necessary to inject the foaming agent, the main shaft 19 is driven to rotate in the first direction. The rotation of the main shaft 19 is synchronously converted into three coordinated actions through the linkage mechanism: first, the booster pump 7 is driven to run, extracting and pressurizing the foaming agent from the foaming agent storage tank 6, and delivering it to the branch pipe 10 through the liquid inlet pipe 8 and the liquid outlet main pipe 9; second, the stirring mechanism is driven to run, stirring the melt in the melt foaming tank 2; and third, the sliding seat 14 is driven to move in the horizontal direction. When the sliding seat 14 moves, the low-position deflector 15 and the high-position deflector 16 on it will sequentially contact the valve stems 12 that are evenly spaced. The low-position deflector 15 first drives a valve stem 12 to swing, which drives the valve core 13 to rotate, thereby opening the corresponding valve body 11 and allowing the high-pressure foaming agent to be injected into the melt from the nozzle 5 at that position. Subsequently, as the sliding seat 14 continues to move, the valve stem 12 is driven by the high-position deflector 16 to continue swinging, which drives the valve core 13 to continue rotating, closing the valve body 11 and stopping the jetting at this point. At the same time, the low-position deflector 15 has moved to the position of the next valve stem 12 and begins to drive it to swing, opening the next nozzle 5. This cycle is repeated to realize the sequential and alternating jetting of multiple nozzles 5. During this process, the continuous operation of the stirring mechanism quickly disperses and mixes the newly injected foaming agent into the melt. Combined with the alternating jetting mode, it effectively avoids the flow field disturbance caused by the simultaneous injection of multiple air streams, and promotes the uniform dispersion and dissolution of the foaming agent in the melt. After the jetting and mixing process is completed, the rotation of the main shaft 19 is stopped. Then, the main shaft 19 is driven to rotate in the second direction. At this time, the linkage mechanism only drives the sliding seat 14 to move horizontally to reset, while the stirring mechanism and the booster pump 7 do not operate. Afterwards, the operator turns multiple valve rods 12 to the initial position to prepare for the next working cycle. Finally, the melt that has formed a homogeneous polymer-gas solution in the molten foaming box 2 can be depressurized to allow it to foam and form.

[0031] As a further embodiment of the present invention, the stirring mechanism includes a stirring shaft 3 rotatably mounted on the melt foaming box 2, and a stirring blade 4 located inside the melt foaming box 2 is fixedly mounted on the stirring shaft 3.

[0032] In this embodiment, the stirring shaft 3 drives the stirring blades 4 to rotate, generating shearing and circulating action on the PET melt in the molten foaming box 2, thereby achieving homogenization of the melt and rapidly mixing and dispersing the injected foaming agent.

[0033] As a further embodiment of the present invention, the linkage mechanism includes a pump shaft 24 connected to the impeller of the booster pump 7 and a lead screw 17 rotatably mounted on the frame 1. The sliding seat 14 is threadedly connected to the lead screw 17. The frame 1 is provided with a limiting component for the sliding seat 14 when it moves. The main shaft 19 is connected to the pump shaft 24, the lead screw 17, and the stirring shaft 3 through a transmission mechanism. When the main shaft 19 rotates in the first direction, the lead screw 17, the pump shaft 24, and the stirring shaft 3 are driven to rotate synchronously through the transmission mechanism. When the main shaft 19 rotates in the second direction opposite to the first direction, the lead screw 17 is driven to rotate in the opposite direction through the transmission mechanism. At this time, neither the pump shaft 24 nor the stirring shaft 3 rotates.

[0034] In this embodiment, the rotation of the lead screw 17 is converted into the horizontal linear movement of the sliding seat 14 through the threaded pair. The limiting component restricts the sliding seat 14 to move horizontally only and not rotate. The transmission mechanism reasonably distributes the power of the main shaft 19 so that when the main shaft 19 rotates in the first direction, the stirring, pumping and valve driving operate synchronously. When the main shaft 19 rotates in the second direction opposite to the first direction, only the sliding seat 14 is reset, and the stirring and pumping work is not started.

[0035] As a further embodiment of the present invention, a motor 20 is fixedly installed on the frame 1, and the output end of the motor 20 is connected to the main shaft 19 through a coupling to drive the main shaft 19 to rotate.

[0036] In this embodiment, the motor 20 is the only power source that provides power to the device. The motor 20 is electrically connected to an external power source through wires. By controlling its direction and speed, the start, stop, timing and speed of the entire foaming work cycle can be controlled.

[0037] As a further embodiment of the present invention, the limiting component includes two guide rods 18 symmetrically distributed on both sides of the lead screw 17 and fixed on the frame 1, with the guide rods 18 passing through the sliding seat 14.

[0038] In this embodiment, the guide rod 18 provides precise linear motion guidance for the sliding seat 14, preventing it from rotating with the lead screw 17 and ensuring the smoothness of its horizontal movement, so that the low-position lever 15 and the high-position lever 16 can accurately align and move each valve stem 12.

[0039] As a further embodiment of the present invention, the transmission mechanism includes a main shaft pulley 21 fixed on the main shaft 19 and a lead screw pulley 22 fixed on the lead screw 17, and the main shaft pulley 21 and the lead screw pulley 22 are driven by a transmission belt 23. A drive shaft 25 is rotatably mounted on the frame 1. The main shaft 19 and the drive shaft 25 are connected by a one-way transmission mechanism. When the main shaft 19 rotates in the first direction, it will drive the drive shaft 25 to rotate. When the main shaft 19 rotates in the second direction opposite to the first direction, the drive shaft 25 will not rotate. The drive shaft 25 is connected to the stirring shaft 3 and the pump shaft 24 via a pulley mechanism. When the drive shaft 25 rotates, it will drive the stirring shaft 3 and the pump shaft 24 to rotate synchronously.

[0040] In this embodiment, the pulley pair consisting of the main shaft pulley 21, the lead screw pulley 22, and the transmission belt 23 ensures that the rotation of the main shaft 19 can be transmitted to the lead screw 17 regardless of whether it rotates forward or backward. The one-way transmission mechanism realizes the selective transmission of power. When the main shaft 19 rotates in the first direction, the power is transmitted to the transmission shaft 25 through it. When the main shaft 19 rotates in the second direction, the one-way transmission mechanism slips and the transmission shaft 25 does not rotate. Therefore, through the pulley mechanism, the stirring shaft 3 and the pump shaft 24 of the booster pump 7 will only be driven when the transmission shaft 25 rotates.

[0041] As a further embodiment of the present invention, a one-way transmission mechanism is rotatably mounted on a drive gear 30 on a frame 1, a driven gear 31 fixed on a transmission shaft 25 and meshing with the drive gear 30, and a ratchet 32 ​​fixed on a main shaft 19. A pawl 33 that engages with the teeth of the ratchet 32 ​​is hinged to the drive gear 30, and a reset spring 34 that applies a preload force to the pawl 33 is fixed to the drive gear 30 and fits against one side of the pawl 33.

[0042] In this embodiment, when the main shaft 19 rotates in the first direction, the teeth of the ratchet 32 ​​push the pawl 33, thereby driving the drive gear 30 to rotate, which in turn drives the driven gear 31 and the transmission shaft 25 to rotate together. When the main shaft 19 rotates in the second direction, the back side of the teeth of the ratchet 32 ​​slides over the pawl 33. Under the action of the reset spring 34, the pawl 33 maintains contact with the teeth but cannot drive the drive gear 30 to rotate, thereby realizing the disengagement of the transmission shaft 25 from the power.

[0043] As a further embodiment of the present invention, the pulley mechanism includes a pump shaft pulley 26 fixed on the pump shaft 24, a transmission shaft pulley 27 fixed on the transmission shaft 25, and a stirring shaft pulley 28 fixed on the stirring shaft 3. The pump shaft pulley 26, the transmission shaft pulley 27, and the stirring shaft pulley 28 are driven by a linkage belt 29.

[0044] In this embodiment, the linkage belt 29 synchronously transmits the power of the drive shaft 25 to the pump shaft pulley 26 and the stirring shaft pulley 28, thereby ensuring that when the drive shaft 25 rotates, the pump shaft 24 of the booster pump 7 and the stirring shaft 3 can rotate synchronously to achieve pumping and stirring.

[0045] As a further embodiment of the present invention, a feed hopper 35 for adding raw materials into the melt foaming box 2 is fixedly installed on the frame 1 and communicates with the melt foaming box 2. A discharge valve is fixedly installed at the bottom of the melt foaming box 2.

[0046] In this embodiment, the feed hopper 35 is used to add a fixed amount of recycled PET fragments into the molten foaming box 2, and the discharge valve is used to discharge the foamed PET melt material in the box after the foaming process is completed.

[0047] As a further aspect of the present invention, when the sliding seat 14 slides horizontally, it first drives the valve stem 12 to deflect 45° through the low-position lever 15, which drives the valve core 13 to rotate synchronously by 45°, so that the air passage of the valve body 11 switches from the closed state to the fully open state; then, the sliding seat 14 continues to move, and drives the valve stem 12 to deflect to 90° through the high-position lever 16, which drives the valve core 13 to rotate synchronously to 90°, so that the air passage of the valve body 11 switches from the fully open state to the closed state again.

[0048] In this embodiment, the opening and closing process of each valve body 11 is precisely divided into two 45° stages, controlled by the low-position lever 15 and the high-position lever 16 respectively. This design enables the jetting action of a single jet nozzle 5 to form a definite matching relationship with the continuous movement of the sliding seat 14, thereby achieving fast and precise valve control.

[0049] The working principle of this invention is as follows: A single motor 20 drives the main shaft 19 to rotate in the first direction. The power drives the lead screw 17 to rotate via a gear pair, causing the sliding seat 14 to move horizontally. Simultaneously, a one-way transmission mechanism, a transmission shaft 25, and a pulley mechanism synchronously drive the stirring shaft 3 and the pump shaft 24 of the booster pump 7 to rotate. When the sliding seat 14 moves, the low-position deflector 15 and the high-position deflector 16 on it sequentially actuate the equally spaced valve stems 12, causing the corresponding valve bodies 11 to open and close in sequence. This allows each nozzle 5 to alternately inject high-pressure foaming agent into the PET melt, operating synchronously. The stirring action of the rotating stirring shaft 3 and stirring blade 4 will immediately mix and disperse the injected foaming agent. After the jet mixing is completed, the motor 20 reverses in the second direction and drives the main shaft 19 to reverse. At this time, the one-way transmission mechanism is disengaged, the stirring shaft 3 and the pump shaft 24 stop rotating, and only the screw 17 reverses to drive the sliding seat 14 to reset. Then, the valve is manually reset, and finally the pressure is released from the molten foaming box 2 to make the melt foam. The foamed product is taken out through the bottom discharge valve. The whole system realizes precise synchronization and timing control of stirring, pumping and alternating opening and closing of multiple valves in a purely mechanical linkage manner. The structure is simple and reliable.

[0050] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.

Claims

1. A thermoplastic raw material foaming and molding apparatus for producing chemical fiber products from recycled PET, comprising a frame (1), characterized in that, A melt foaming box (2) is fixed on the frame (1). A stirring mechanism is provided inside the melt foaming box (2). Multiple air nozzles (5) are evenly distributed on the top of the melt foaming box (2). The frame (1) is also fixedly equipped with a foaming agent storage tank (6) and a booster pump (7). The inlet end of the booster pump (7) is connected to the foaming agent storage tank (6) through the liquid inlet pipe (8). The outlet end of the booster pump (7) is connected to multiple branch pipes (10) through the liquid outlet main pipe (9). Each branch pipe (10) is connected to the corresponding jet nozzle (5). Each of the branch pipes (10) is fixedly installed with a valve body (11), and a valve stem (12) is rotatably installed on the valve body (11). A valve core (13) for opening and closing the internal air passage of the valve body (11) is fixed on the valve stem (12). A sliding seat (14) is slidably disposed on the frame (1) in the horizontal direction. A low position dial plate (15) and a high position dial plate (16) are fixed on the sliding seat (14) from right to left. A main shaft (19) is also rotatably mounted on the frame (1). The main shaft (19) is connected to the drive end of the stirring mechanism, the sliding seat (14) and the drive end of the booster pump (7) through a linkage mechanism. When the main shaft (19) rotates in the first direction, the linkage mechanism synchronously drives the stirring mechanism to run, drives the booster pump (7) to run, and drives the sliding seat (14) to move horizontally, so that the low-position dial plate (15) and the high-position dial plate (16) can alternately dial each valve rod (12) to swing, thereby alternately opening multiple valve bodies (11). When the main shaft (19) rotates in a second direction opposite to the first direction, the sliding seat (14) is driven to move horizontally to reset through the linkage mechanism, and at this time neither the stirring mechanism nor the booster pump (7) is running.

2. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 1, characterized in that, The stirring mechanism includes a stirring shaft (3) rotatably mounted on the melt foaming box (2), and a stirring blade (4) located in the inner cavity of the melt foaming box (2) is fixedly mounted on the stirring shaft (3).

3. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 2, characterized in that, The linkage mechanism includes a pump shaft (24) connected to the impeller of the booster pump (7) and a lead screw (17) rotatably mounted on the frame (1). The sliding seat (14) is threadedly connected to the lead screw (17). The frame (1) is provided with a limiting component for the sliding seat (14) when it moves. The main shaft (19) is connected to the pump shaft (24), the lead screw (17), and the stirring shaft (3) through a transmission mechanism. When the main shaft (19) rotates in the first direction, the lead screw (17), the pump shaft (24), and the stirring shaft (3) are driven to rotate synchronously through the transmission mechanism. When the main shaft (19) rotates in the second direction opposite to the first direction, the lead screw (17) is driven to rotate in the opposite direction through the transmission mechanism. At this time, neither the pump shaft (24) nor the stirring shaft (3) rotates.

4. The thermoplastic raw material foaming and molding device for producing chemical fiber products from recycled PET according to claim 3, characterized in that, A motor (20) is fixedly installed on the frame (1). The output end of the motor (20) is connected to the main shaft (19) through a coupling to drive the main shaft (19) to rotate.

5. The thermoplastic raw material foaming and molding device for producing chemical fiber products from recycled PET according to claim 3, characterized in that, The limiting component includes two guide rods (18) fixed on the frame (1) and symmetrically distributed on both sides of the lead screw (17). The guide rods (18) pass through the sliding seat (14).

6. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 3, characterized in that, The transmission mechanism includes a main shaft pulley (21) fixed on the main shaft (19) and a screw pulley (22) fixed on the lead screw (17). The main shaft pulley (21) and the lead screw pulley (22) are driven by a transmission belt (23). A drive shaft (25) is rotatably mounted on the frame (1). The main shaft (19) and the drive shaft (25) are connected by a one-way transmission mechanism. When the main shaft (19) rotates in the first direction, it will drive the drive shaft (25) to rotate. When the main shaft (19) rotates in the second direction opposite to the first direction, the drive shaft (25) will not rotate. The drive shaft (25) is connected to the stirring shaft (3) and the pump shaft (24) through a pulley mechanism. When the drive shaft (25) rotates, it will drive the stirring shaft (3) and the pump shaft (24) to rotate synchronously.

7. The thermoplastic raw material foaming and molding device for producing chemical fiber products from recycled PET according to claim 6, characterized in that, The one-way transmission mechanism is rotatably mounted on the frame (1) with a drive gear (30), a driven gear (31) fixed on the transmission shaft (25) and meshing with the drive gear (30), and a ratchet (32) fixed on the main shaft (19). The drive gear (30) is hinged with a pawl (33) that meshes with the teeth of the ratchet (32). The drive gear (30) is fixed with a reset spring (34) that is attached to one side of the pawl (33) for applying a preload force to the pawl (33).

8. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 6, characterized in that, The pulley mechanism includes a pump shaft pulley (26) fixed on the pump shaft (24), a transmission shaft pulley (27) fixed on the transmission shaft (25), and a stirring shaft pulley (28) fixed on the stirring shaft (3). The pump shaft pulley (26), the transmission shaft pulley (27), and the stirring shaft pulley (28) are driven by a linkage belt (29).

9. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 1, characterized in that, The frame (1) is fixedly installed with a feed hopper (35) for adding raw materials into the melt foaming box (2) and communicating with the melt foaming box (2). The bottom of the melt foaming box (2) is fixedly installed with a discharge valve.

10. The thermoplastic raw material foaming and molding device for recycling PET to produce chemical fiber products according to claim 1, characterized in that, When the sliding seat (14) slides horizontally, the valve stem (12) is first driven to deflect 45° by the low-position lever (15), which drives the valve core (13) to rotate 45° synchronously, so that the air passage of the valve body (11) switches from the closed state to the fully open state; then, the sliding seat (14) continues to move, and the valve stem (12) is driven to deflect to 90° by the high-position lever (16), which drives the valve core (13) to rotate to 90° synchronously, so that the air passage of the valve body (11) switches from the fully open state to the closed state again.

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