Polytetrafluoroethylene high-performance sealing piece forming device for recycling waste plastics

Abstract

The application discloses a polytetrafluoroethylene high-performance sealing piece forming device for recycling waste plastics and relates to the technical field of recycling waste plastics, which comprises an injection molding machine, wherein a raw material detection mechanism, a temperature control forming mechanism and a molecular chain crosslinking reinforcing mechanism are arranged on the injection molding machine. Through the synergistic system of the raw material detection mechanism, the temperature control forming mechanism and the molecular chain crosslinking reinforcing mechanism, the raw material detection mechanism accurately identifies the molecular chain degradation degree of waste polytetrafluoroethylene material, the temperature control forming mechanism performs segmented temperature control heating according to the detection result, and the molecular chain crosslinking reinforcing mechanism adds modifiers and fully mixes them, so that the effective inhibition of the molecular chain degradation of the waste polytetrafluoroethylene material is realized, and then the excellent effects that the anti-creep performance of the formed piece is maintained stable, the sealing specific pressure under high-temperature working conditions is kept constant, and the formed sealing piece always maintains stable sealing performance under high-temperature working conditions are achieved.

Description

Technical Field

[0001] This invention relates to the field of waste plastic recycling technology, and in particular to a high-performance polytetrafluoroethylene (PTFE) sealing component molding device for waste plastic recycling. Background Technology

[0002] Polytetrafluoroethylene (PTFE), with its excellent high and low temperature resistance, superior chemical stability, and extremely low coefficient of friction, has become a key material for manufacturing high-performance seals, widely used in high-temperature and high-pressure sealing applications in industries such as petrochemicals, aerospace, and new energy equipment. With the increasing global awareness of energy conservation and environmental protection and the promotion of resource recycling policies, the recycling and reuse of waste PTFE materials has become an important issue for the sustainable development of the industry, leading to the emergence of high-performance PTFE seal molding equipment based on waste plastic recycling. However, existing high-performance PTFE seal molding equipment based on waste plastic recycling still has the following shortcomings during use.

[0003] For example, Chinese patent CN205238408U discloses a hot pressing and shaping machine for recycled polytetrafluoroethylene strip. The machine heats and shapes the recycled strip through a hot pressing mechanism. After the recycled strip is heated and softened, it is compacted and flattened by a set of pressure rollers to remove surface defects, overcome quality defects, and improve the density and quality of the recycled strip.

[0004] However, during the initial use, recycling, crushing, and screening processes, the molecular chains of waste PTFE materials are highly susceptible to breakage and degradation, leading to a significant decrease in melt strength and creep resistance, directly affecting the reliability of the molded seals. While the aforementioned device achieves hot-pressing and shaping of recycled PTFE strips, improving their surface quality and density, it still has significant technical shortcomings in addressing the creep resistance degradation caused by the degradation of the molecular chains in waste PTFE materials.

[0005] Specifically, most heating devices used employ a single heat source, i.e., a non-differentiated temperature control system. Essentially, this is a constant-temperature heating mode, unable to dynamically adjust heating temperature parameters according to the different degrees of degradation of waste materials. This easily leads to further breakage of the degraded molecular chains or insufficient molding, exacerbating the deterioration of creep resistance. Furthermore, simple temperature control alone cannot compensate for the insufficient melt strength caused by the degradation of waste material molecular chains, nor can it form an effective molecular chain cross-linking reinforcement effect. Consequently, the sealing surface of the molded seal is prone to creep deformation, resulting in a decrease in sealing specific pressure and failing to meet the long-term performance requirements of high-temperature industrial sealing scenarios. Summary of the Invention

[0006] The purpose of this application is to provide a high-performance polytetrafluoroethylene (PTFE) sealing component molding device for recycling waste plastics, which can effectively solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this application provides the following technical solution: a high-performance polytetrafluoroethylene (PTFE) sealing component molding device for recycling waste plastics, comprising an injection molding machine, wherein the injection molding machine is equipped with a raw material detection mechanism, a temperature-controlled molding mechanism, and a molecular chain crosslinking reinforcement mechanism; the raw material detection mechanism includes a first storage hopper disposed above the injection molding machine, and the raw material detection mechanism is used to detect the degree of molecular chain degradation of the PTFE plastic in the first storage hopper; the temperature-controlled molding mechanism is used to perform segmented temperature-controlled heating of the PTFE plastic according to the detection results of the raw material detection mechanism; the molecular chain crosslinking reinforcement mechanism includes: a mixing hopper, a modifier filling mechanism, a mixing and stirring mechanism, and an auxiliary stirring mechanism; wherein, the The mixing hopper is located below the first storage hopper, and the discharge end of the first storage hopper is connected to the mixing hopper; the modifier filling mechanism is located on one side of the first storage hopper and is used to add modifier particles identical to those of polytetrafluoroethylene plastic into the mixing hopper; the mixing and stirring mechanism is located in the mixing hopper and is used to stir and mix polytetrafluoroethylene plastic and modifier; and an auxiliary stirring mechanism is provided, which includes an air pump located on the injection molding machine and multiple nozzles installed on the bottom side wall of the mixing hopper; the air outlet of the air pump is connected to the multiple nozzles; when the air pump forms an upward airflow at the bottom of the mixing hopper through the nozzles, the upward airflow counteracts the gravity of the raw material, allowing the raw material to be stirred and mixed in the mixing hopper.

[0008] Preferably, the auxiliary stirring mechanism includes a gas storage shell, a linkage mechanism, and multiple mounting blocks; the gas storage shell is coaxially sleeved at the bottom of the mixing hopper, and an airflow channel is provided inside the gas storage shell; each of the multiple mounting blocks is fixed with a rotating shaft, and the mounting blocks are rotatably connected to the mixing hopper via the rotating shaft; the nozzle is mounted on the mounting block; the output end of the air pump is connected to the nozzle on the multiple mounting blocks via the airflow channel; the linkage mechanism is located in the gas storage shell and is used to drive the mounting blocks to rotate around the axis of the rotating shaft, so that the nozzle is tilted towards the inside of the mixing hopper or hidden in the inner wall of the mixing hopper.

[0009] Preferably, the linkage mechanism includes a rotating ring, multiple torsion springs, wedge blocks, a push plate, a first telescopic tube, and a second telescopic tube; the rotating ring is coaxially rotatably connected to the mixing hopper, and the multiple wedge blocks are equally spaced around the rotating ring; the mounting block has a groove adapted to the wedge blocks, and the wedge blocks are slidably connected in the groove; the multiple push plates are fixed to the rotating ring, and one end of the push plate is inserted into the airflow channel of the gas storage shell; the multiple first telescopic tubes are equally spaced around the mixing hopper in the airflow channel; the push plate is located at the middle position of the first telescopic tube and divides the first telescopic tube into a connecting cavity and a pressure cavity; one end of the connecting cavity of the first telescopic tube is connected to the airflow channel, and the pressure cavity of the first telescopic tube is connected to the nozzle on the mounting block through the second telescopic tube; the push plate has a through hole, and the connecting cavity and the pressure cavity are connected through the through hole.

[0010] Preferably, the linkage mechanism further includes a one-way valve coaxially installed in the through hole, and a push pin is provided in the pressure chamber of the first telescopic tube. One end of the push pin is aligned with the top ball on the one-way valve. When the air pressure in the airflow channel increases, it allows the push plate to move, compressing the pressure chamber in the first telescopic tube, thereby allowing the push pin to push the top ball on the one-way valve to move, so that the one-way valve opens.

[0011] Preferably, the raw material testing mechanism includes a first conveying pipe, a first metering pump, an observation window, and a testing instrument; the first storage hopper and the mixing hopper are connected by the first conveying pipe, the first metering pump is installed on the injection molding machine, one end of the first metering pump is connected to the discharge end of the first storage hopper, and the other end of the first metering pump is connected to the mixing hopper through the first conveying pipe; an observation window is provided on the first conveying pipe, and a flat transparent glass is installed on the observation window; the testing instrument is installed on the injection molding machine, and the laser emitting end of the testing instrument faces the observation window.

[0012] Preferably, the raw material detection mechanism further includes a first electric valve disposed on the first conveying pipe; the first electric valve allows control of the flow rate of the raw material in the first conveying pipe to increase the residence time of the raw material at the observation window position.

[0013] Preferably, the temperature-controlled molding mechanism includes multiple heating sleeves, annular electric heating wires, and thermal insulation cotton; the multiple heating sleeves are coaxially sleeved on the injection end of the injection tube of the injection molding machine, the annular electric heating wires are sleeved inside the heating sleeves, and the gap between the heating sleeves and the annular electric heating wires is filled with thermally conductive silicone; the thermal insulation cotton is sleeved on the heating sleeves.

[0014] Each adjacent heating jacket is coaxially provided with a heat-insulating partition ring; the heat-insulating partition ring is an integrally formed structure of zirconia ceramic material.

[0015] Preferably, the modifier filling mechanism includes a second storage hopper, a second conveying pipe, a second metering pump, and a second electric valve; the second storage hopper is disposed above the mixing hopper, and the second storage hopper and the mixing hopper are connected through the second conveying pipe; the second electric valve is installed on the second conveying pipe near one end of the mixing hopper; the second metering pump is installed on the injection molding machine, one end of the second metering pump is connected to the outlet of the second storage hopper, and the other end of the second metering pump is connected to the mixing hopper through the second conveying pipe.

[0016] Preferably, the injection molding machine is equipped with a controller, and the controller is connected to the detector and the second metering pump via signal control.

[0017] Preferably, the mixing mechanism includes a motor and a spiral stirring rod; the motor is installed on the top of the mixing hopper; the spiral stirring rod is coaxially connected to the output end of the motor and is used to stir and mix the raw materials in the mixing hopper.

[0018] In summary, the technical effects and advantages of this invention are as follows:

[0019] 1. This invention establishes a synergistic system comprising a raw material detection mechanism, a temperature-controlled molding mechanism, and a molecular chain crosslinking reinforcement mechanism. The raw material detection mechanism accurately identifies the degree of molecular chain degradation in waste polytetrafluoroethylene (PTFE) materials. The temperature-controlled molding mechanism performs segmented temperature-controlled heating based on the detection results. The molecular chain crosslinking reinforcement mechanism selectively adds modifiers and mixes them thoroughly. This effectively inhibits the degradation of the molecular chains in waste PTFE materials, thereby maintaining stable creep resistance and constant sealing pressure under high-temperature conditions, ensuring that the molded seals maintain stable sealing performance under high-temperature conditions.

[0020] 2. This invention incorporates an auxiliary stirring mechanism. The airflow generated by the air pump forms a spiral upward airflow through the nozzle, which counteracts the gravity of the raw materials and keeps them in a suspended state. This, combined with the spiral stirring rod of the mixing and stirring mechanism, achieves all-round stirring. At the same time, the linkage mechanism drives the nozzle to tilt towards the inside of the mixing hopper or hide it on the inner wall. This not only improves the uniformity of mixing between the raw materials and the modifier, but also avoids obstructing the falling of materials, ensuring uniform cross-linking and reinforcement of molecular chains, and further enhancing the consistency of the performance of the molded parts.

[0021] 3. By setting up a heat-insulating partition ring, which is integrally molded from zirconia ceramic material, the present invention has an extremely low thermal conductivity, which can effectively block the heat conduction interference between adjacent heating jackets. Combined with the annular electric heating wire and thermally conductive silicone inside the heating jacket, the temperature of each segmented heating area is always kept within the preset range, the temperature zoning accuracy is greatly improved, and the problems of further breakage of degradation molecular chains or insufficient molding are avoided, which significantly improves the crystallinity uniformity and creep resistance of the molded parts. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall second-view three-dimensional structure of the present invention;

[0025] Figure 3 This is a three-dimensional enlarged schematic diagram of a portion of the temperature-controlled molding mechanism of the present invention;

[0026] Figure 4 This is a three-dimensional enlarged structural diagram of the raw material detection mechanism and the molecular chain crosslinking reinforcement mechanism of the present invention;

[0027] Figure 5 This is a three-dimensional enlarged structural schematic diagram of the molecular chain crosslinking reinforcement mechanism of the present invention;

[0028] Figure 6 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the mixing hopper of the present invention;

[0029] Figure 7 This is a three-dimensional enlarged structural schematic diagram of the gas storage shell of the present invention;

[0030] Figure 8 This is a three-dimensional enlarged schematic diagram of the internal structure of the gas storage shell of the present invention;

[0031] Figure 9 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the linkage mechanism of the present invention;

[0032] Figure 10 This is a partially cross-sectional, three-dimensional magnified structural diagram of the nozzle of the present invention;

[0033] Figure 11 For the present invention Figure 10 A magnified structural diagram of region A in the middle.

[0034] In the diagram: 1. Injection molding machine; 2. Raw material testing mechanism; 21. First hopper; 22. First conveying pipe; 23. First metering pump; 24. First electric valve; 25. Observation window; 26. Detector; 3. Temperature-controlled molding mechanism; 31. Heating jacket; 32. Annular electric heating wire; 33. Thermal insulation cotton; 34. Thermal insulation separator ring; 4. Molecular chain cross-linking reinforcement mechanism; 41. Modifier filling mechanism; 411. Second hopper; 412. Second conveying pipe; 413. Second metering pump; 414. Second electric valve; 4 2. Mixing hopper; 43. Mixing and stirring mechanism; 431. Motor; 432. Spiral stirring rod; 44. Auxiliary stirring mechanism; 441. Air pump; 442. Air storage shell; 443. Airflow channel; 444. Mounting block; 445. Nozzle; 446. Linkage mechanism; 4461. Torsion spring; 4462. Rotating ring; 4463. Wedge block; 4464. Slide groove; 4465. Push plate; 4466. First telescopic tube; 4467. Second telescopic tube; 4468. One-way valve; 4469. Ejector pin. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figures 1-2 , Figures 4-5 and Figure 7The illustrated high-performance polytetrafluoroethylene (PTFE) sealing component molding device for recycling waste plastics includes an injection molding machine 1. The injection molding machine 1 is equipped with a raw material detection mechanism 2, a temperature-controlled molding mechanism 3, and a molecular chain crosslinking and reinforcing mechanism 4. The raw material detection mechanism 2 includes a first storage hopper 21 located above the injection molding machine 1, used to detect the degree of molecular chain degradation of the PTFE plastic in the first storage hopper 21. The temperature-controlled molding mechanism 3 is used to heat the PTFE plastic in stages according to the detection results of the raw material detection mechanism 2. The molecular chain crosslinking and reinforcing mechanism 4 includes a mixing hopper 42, a modifier filling mechanism 41, a mixing and stirring mechanism 43, and an auxiliary stirring mechanism 44. The mixing hopper 42 is located below the first storage hopper 21, and the discharge end of the first storage hopper 21 is connected to the mixing hopper 42. The modifier filling mechanism 41 is located in the first storage hopper 21. 1. On one side, a modifier with the same particles as polytetrafluoroethylene plastic is added to the mixing hopper 42; a mixing and stirring mechanism 43 is disposed in the mixing hopper 42 and is used to stir and mix polytetrafluoroethylene plastic and modifier; it is understood that the modifier is prior art and will not be described in detail; the auxiliary stirring mechanism 44 includes an air pump 441 disposed on the injection molding machine 1 and a plurality of nozzles 445 installed on the bottom side wall of the mixing hopper 42; the air outlet of the air pump 441 is connected to the plurality of nozzles 445; when the air pump 441 forms an upward airflow at the bottom of the mixing hopper 42 through the nozzles 445, the upward airflow counteracts the gravity of the raw material, allowing the raw material to be stirred and mixed in the mixing hopper 42; it is understood that a vent is provided at the top of the mixing hopper 42 to allow the upward airflow to be discharged through the vent; and a filter screen is provided on the vent to prevent the discharge of powdery raw material.

[0037] It should be noted that during use, as the old PTFE raw material is conveyed from the first storage hopper 21 to the mixing hopper 42, the degree of degradation of the PTFE plastic molecular chains is detected by the raw material detection mechanism 2. Then, a suitable molecular chain crosslinking modifier is filled into the mixing hopper 42 through the modifier filling mechanism 41. Afterwards, the mixing and stirring mechanism 43 is activated to stir and mix the raw material and modifier in the mixing hopper 42. At the same time, the air pump 441 of the auxiliary stirring mechanism 44 is activated, and the air outlet of the air pump 441 delivers airflow to multiple nozzles 445. The nozzles 445 form an upward airflow at the bottom of the mixing hopper 42. This upward airflow can counteract the gravity of the raw material, keeping the raw material in a suspended state in the mixing hopper 42, which, together with the mixing and stirring mechanism 43, achieves more thorough mixing. The uniformly mixed material enters the temperature-controlled molding mechanism 3. The temperature-controlled molding mechanism 3 performs segmented temperature-controlled heating on the material according to the detection results of the raw material detection mechanism 2, and finally completes the molding of the PTFE high-performance seal.

[0038] The raw material testing mechanism 2 accurately measures the degree of molecular chain degradation in waste PTFE, providing data support for subsequent temperature control and modification. The segmented temperature control design of the temperature-controlled molding mechanism 3 avoids further breakage of degraded molecular chains or insufficient molding caused by constant temperatures, ensuring molding quality. The molecular chain crosslinking reinforcement mechanism 4, with its mixing hopper 42, modifier filling mechanism 41, and mixing and stirring mechanism 43, achieves uniform mixing of the modifier and raw materials. Combined with the upward airflow of the auxiliary stirring mechanism 44, it significantly improves mixing uniformity, ensuring that the modifier can fully contact the degraded molecular chains and form crosslinking bonds, effectively compensating for the insufficient melt strength caused by the degradation of waste material molecular chains. The coordinated operation of the entire structure significantly improves the creep resistance of the molded seal, maintaining a stable sealing pressure under high-temperature conditions.

[0039] See Figures 5-7 The auxiliary mixing mechanism 44 includes an air storage shell 442, a linkage mechanism 446, and multiple mounting blocks 444. The air storage shell 442 is coaxially sleeved at the bottom of the mixing hopper 42, and an airflow channel 443 is provided inside the air storage shell 442. A rotating shaft is fixed on each of the multiple mounting blocks 444, and the mounting blocks 444 are rotatably connected to the mixing hopper 42 via the rotating shaft. Nozzles 445 are mounted on the mounting blocks 444. The output end of the air pump 441 is connected to the nozzles 445 on the multiple mounting blocks 444 via the airflow channel 443. The linkage mechanism 446 is located in the air storage shell 442 and is used to drive the mounting blocks 444 to rotate around the axis of the rotating shaft, so that the nozzles 445 are tilted towards the inside of the mixing hopper 42 or hidden within the inner wall of the mixing hopper 42. It is understood that, as Figure 11 As shown, the nozzle of the nozzle 445 can be designed as an inclined nozzle, so that the airflow ejected by the nozzle 445 can form a spiral upward airflow in the mixing hopper 42, thereby preventing the raw materials from falling while increasing the dispersion range of the raw materials in the mixing hopper 42 and increasing the mixing effect of the raw materials.

[0040] It should be noted that when mixing is required, the linkage mechanism 446 drives the mounting block 444 to rotate around the axis of the rotating shaft, causing the nozzle 445 to tilt towards the inside of the mixing hopper 42. At this time, the airflow delivered by the air pump 441 is sprayed into the mixing hopper 42 through the nozzle 445, forming an upward airflow. After mixing is completed, the linkage mechanism 446 drives the mounting block 444 to rotate in the opposite direction, causing the nozzle 445 to be hidden in the inner wall of the mixing hopper 42, thus preventing the nozzle 445 from obstructing the falling material.

[0041] The linkage mechanism 446 enables the adjustment and concealment of the nozzle 445's angle. During mixing, the nozzle 445 tilts towards the inside of the mixing hopper 42, precisely generating an upward airflow to enhance the mixing effect. After mixing, the nozzle 445 is concealed within the inner wall of the mixing hopper 42, effectively preventing interference with the material's descent and ensuring smooth material flow into the subsequent temperature-controlled molding mechanism 3. The design of the gas storage shell 442 and the airflow channel 443 makes the airflow delivery more stable, and the even distribution of multiple mounting blocks 444 ensures the uniformity of the upward airflow, further improving the mixing effect of the raw materials and modifier.

[0042] See Figures 7-11 The linkage mechanism 446 includes a rotating ring 4462, multiple torsion springs 4461, wedge blocks 4463, push plates 4465, first telescopic tubes 4466, and second telescopic tubes 4467. The rotating ring 4462 is coaxially rotatably connected to the mixing hopper 42. Multiple wedge blocks 4463 are evenly spaced around the rotating ring 4462. The mounting block 444 has a groove 4464 adapted to the wedge blocks 4463, and the wedge blocks 4463 are slidably connected in the groove 4464. Multiple push plates 4465 are fixed to the rotating ring 4462, and one end of the push plate 4465 is inserted into the airflow channel 443 of the gas storage shell 442. Multiple first telescopic tubes 4466 are evenly spaced around the mixing hopper 42 in the airflow channel 443. The push plate 4465 is located at the middle position of the first telescopic tube 4466. The first telescopic tube 4466 is divided into a connecting chamber and a pressure chamber. One end of the connecting chamber of the first telescopic tube 4466 is connected to the airflow channel 443, and the pressure chamber of the first telescopic tube 4466 is connected to the nozzle 445 on the mounting block 444 through the second telescopic tube 4467. A through hole is provided on the push plate 4465, and the connecting chamber and the pressure chamber are connected through the through hole. The linkage mechanism 446 also includes a one-way valve 4468 coaxially installed in the through hole. A pin 4469 is provided in the pressure chamber of the first telescopic tube 4466, and one end of the pin 4469 is aligned with the top ball on the one-way valve 4468. When the air pressure in the airflow channel 443 increases, the push plate 4465 is allowed to move, compressing the pressure chamber in the first telescopic tube 4466, thereby allowing the pin 4469 to push the top ball on the one-way valve 4468 to move, so that the one-way valve 4468 opens.

[0043] It should be noted that when the air pressure in the airflow channel 443 increases, the airflow pushes the pressure chamber in the first telescopic tube 4466 to increase, thereby pushing the push plate 4465 to move. At the same time, the movement of the push plate 4465 drives the rotating ring 4462 to rotate. Through the cooperation of the wedge block 4463 and the slide groove 4464, the nozzle 445 on the mounting block 444 is driven to disengage from the inner wall of the mixing hopper 42. At the same time, the torsion spring 4461 is compressed. When the push plate 4465 moves, the top ball on the one-way valve 4468 abuts against the ejector pin 4469, thereby driving the one-way valve 4468 to open through the ejector pin 4469. At this time, the airflow enters the pressure chamber through the through hole and is then sprayed out from the nozzle 445 through the second telescopic tube 4467. When the air pressure in the airflow channel 443 decreases, the one-way valve 4468 automatically closes, the ejector pin 4469 resets, and the push plate 4465 resets under the elastic action of the first telescopic tube 4466 and the torsion spring 4461, which drives the rotating ring 4462 and the mounting block 444 to reset, and drives the nozzle 445 to hide.

[0044] The push plate 4465 and rotating ring 4462 are driven by airflow pressure to move, thereby adjusting the angles of the mounting block 444 and nozzle 445. This eliminates the need for an additional drive power source, simplifying the structural design and reducing energy consumption. The cooperation between the wedge block 4463 and the slide groove 4464 ensures smoother and more precise rotation of the mounting block 444, guaranteeing that the nozzle 445 accurately reaches the preset position. The first telescopic tube 4466 and the second telescopic tube 4467 ensure smooth airflow delivery and accommodate positional changes caused by the movement of the push plate 4465 and the rotation of the mounting block 444. The overall linkage structure responds quickly and operates reliably; it facilitates the rotation of the nozzle 445, aiding in material mixing, and the nozzle 445 can automatically rotate and retract, allowing for automatic discharge of the mixed material.

[0045] See Figures 1-2 and Figures 4-5 The raw material testing mechanism 2 includes a first conveying pipe 22, a first metering pump 23, an observation window 25, and a detector 26. The first storage hopper 21 and the mixing hopper 42 are connected through the first conveying pipe 22. The first metering pump 23 is installed on the injection molding machine 1. One end of the first metering pump 23 is connected to the discharge end of the first storage hopper 21, and the other end of the first metering pump 23 is connected to the mixing hopper 42 through the first conveying pipe 22. An observation window 25 is provided on the first conveying pipe 22. A flat transparent glass is installed on the observation window 25. The detector 26 is installed on the injection molding machine 1, and the laser emitting end of the detector 26 is facing the observation window 25.

[0046] It should be noted that the waste polytetrafluoroethylene raw material flows out from the first storage hopper 21, is metered by the first metering pump 23, and then enters the first conveying pipe 22. When the raw material flows through the observation window 25, the laser emitting end of the detector 26 emits a laser, which shines through the flat transparent glass onto the raw material. The detector 26 receives the reflected signal and analyzes it to determine the degree of degradation of the molecular chain of the raw material.

[0047] The first delivery pipe 22 and the first metering pump 23 enable quantitative delivery of raw materials, ensuring precise and controllable quantity of raw materials entering the mixing hopper 42, thus providing a foundation for the accurate addition of modifiers. The design of the observation window 25 and the flat transparent glass allows the detector 26 to clearly and accurately detect the degree of molecular chain degradation of the raw materials, significantly improving the accuracy of the test results. This facilitates precise modification by the subsequent molecular chain crosslinking and reinforcing mechanism 4 and segmented temperature control by the temperature-controlled molding mechanism 3, making the parameter matching of each mechanism more precise. This effectively avoids problems such as insufficient modification or improper temperature control caused by inaccurate detection of raw material quantity or degradation degree, further improving the performance stability and reliability of the molded parts, and keeping the sealing pressure drop of the seal within a minimum range.

[0048] See Figure 5 Raw material testing institution 2 (such as Figure 2 (As shown) It also includes a first electric valve 24 disposed on the first conveying pipe 22; the first electric valve 24 allows the flow rate of the raw material in the first conveying pipe 22 to be controlled, so as to increase the residence time of the raw material at the observation window 25.

[0049] It should be noted that when the raw material flows through the observation window 25, the flow rate of the raw material in the first conveying pipe 22 can be controlled by adjusting the opening of the first electric valve 24. This extends the residence time of the raw material at the observation window 25, or even stops the flow, causing the raw material to accumulate at the observation window 25. This ensures that the detector 26 has sufficient time to complete the detection, improving the accuracy of the detection results. After the detection is completed, the opening of the first electric valve 24 is increased to allow the raw material to flow quickly into the mixing hopper 42, preventing raw material accumulation.

[0050] The first electric valve 24 allows for flexible adjustment of the raw material flow rate. By extending the residence time of the raw material at the observation window 25, the detector 26 can collect more complete information about the raw material, significantly improving detection accuracy. Precise detection results provide a more reliable basis for subsequent adjustments to the modifier filling amount and the setting of temperature control parameters, resulting in better effects on molecular chain crosslinking reinforcement and segmented temperature control.

[0051] See Figures 1-3The temperature-controlled molding mechanism 3 includes multiple heating sleeves 31, annular electric heating wires 32, and insulation cotton 33. The multiple heating sleeves 31 are coaxially sleeved on the injection end of the injection tube of the injection molding machine 1. The annular electric heating wires 32 are sleeved inside the heating sleeves 31, and the gap between the heating sleeves 31 and the annular electric heating wires 32 is filled with thermally conductive silicone. The insulation cotton 33 is sleeved on the heating sleeves 31. A heat-insulating separator ring 34 is coaxially arranged between adjacent heating sleeves 31. The heat-insulating separator ring 34 is an integrally molded structure made of zirconia ceramic material.

[0052] It should be noted that, based on the test results of the raw material testing agency 2, segmented temperature control heating is achieved by controlling the heating power of the annular electric heating wire 32 inside the heating jacket 31. The thermally conductive silicone ensures that the heat generated by the annular electric heating wire 32 is quickly transferred to the heating jacket 31, the heat insulation cotton 33 reduces heat loss, and the heat insulation partition ring 34 blocks heat conduction interference between adjacent heating jackets 31.

[0053] The combination of multiple heating jackets 31 and annular electric heating wires 32 enables segmented temperature control, while the filling with thermally conductive silicone improves thermal conductivity. Insulation cotton 33 effectively reduces heat loss, improves energy utilization, and ensures the stability of the heating temperature. The zirconia ceramic insulating ring 34 has an extremely low thermal conductivity, effectively blocking heat conduction interference between adjacent heating areas, ensuring that the temperature of each heating segment remains within the preset range, and significantly improving the accuracy of temperature zoning.

[0054] Example 2: The technical solution of this example differs from that of Example 1 in that: (See below) Figures 4-5 The modifier filling mechanism 41 includes a second storage hopper 411, a second conveying pipe 412, a second metering pump 413, and a second electric valve 414. The second storage hopper 411 is located above the mixing hopper 42, and the second storage hopper 411 and the mixing hopper 42 are connected through the second conveying pipe 412. The second electric valve 414 is installed on the second conveying pipe 412 near one end of the mixing hopper 42. The second metering pump 413 is installed on the injection molding machine 1, and one end of the second metering pump 413 is connected to the outlet of the second storage hopper 411. The other end of the second metering pump 413 is connected to the mixing hopper 42 through the second conveying pipe 412.

[0055] It should be noted that, based on the test results of the raw material testing agency 2, the second metering pump 413 precisely controls the output of the modifier in the second storage hopper 411. The modifier is transported to the mixing hopper 42 via the second conveying pipe 412. The second electric valve 414 controls the opening and closing of the second conveying pipe 412 to ensure that the modifier is added as needed.

[0056] The second metering pump 413 enables precise quantitative delivery of the modifier, allowing adjustment of the modifier dosage based on the degree of molecular chain degradation in the raw materials to optimize the cross-linking and reinforcing effect of the degraded molecular chains. The second electric valve 414 ensures the timeliness and controllability of modifier addition, preventing over- or under-addition of the modifier.

[0057] See Figures 1-2 and Figure 4 The injection molding machine 1 is equipped with a controller, which is connected to the detector 26 and the second metering pump 413 via signal control. It is understood that the controller and the detector 26 are existing technologies. The detector 26 can be a laser Raman spectrometer, which will not be described in detail here.

[0058] It should be noted that the detector 26 transmits the detected raw material molecular chain degradation level signal to the controller. Based on the preset correspondence between the degradation level and the modifier addition amount, the controller sends a control signal to the second metering pump 413. The second metering pump 413 adjusts the modifier delivery amount according to the control signal, achieving automatic and precise control of the modifier addition amount. Simultaneously, the controller can also adjust the heating parameters of the heating jacket 31 and the annular electric heating wire 32 of the temperature-controlled molding mechanism 3 according to the degradation level signal. Through the heat insulation effect of the heat-insulating separator ring 34, the temperature of each heating zone is ensured to remain stable within the appropriate range.

[0059] The controller enables automated control of the device. The signal connection between the detector 26 and the second metering pump 413 allows the modifier addition amount to be automatically adjusted according to the degree of raw material degradation without manual intervention, thus improving the automation level and production efficiency of the device. The controller adjusts the parameters of the heating jacket 31 and the annular electric heating wire 32 of the temperature-controlled molding mechanism 3. Combined with the efficient heat insulation of the heat insulation separation ring 34, this further ensures the precision of the coordination between the various mechanisms, making the entire production process more consistent and reliable.

[0060] See Figures 5-6 It is understood that this application does not limit the specific structure and installation method of the mixing mechanism 43. The following only provides a feasible technical solution: The mixing mechanism 43 includes a motor 431 and a spiral stirring rod 432; the motor 431 is installed on the top of the mixing hopper 42; the spiral stirring rod 432 is coaxially connected to the output end of the motor 431 and is used to stir and mix the raw materials in the mixing hopper 42.

[0061] It should be noted that after the raw materials and modifiers enter the mixing hopper 42, the motor 431 starts, driving the spiral stirring rod 432 to rotate. The spiral stirring rod 432 performs spiral stirring of the materials in the mixing hopper 42, ensuring thorough mixing of the raw materials and modifiers. Simultaneously, the rising airflow generated by the air pump 441 of the auxiliary stirring mechanism 44, combined with the stirring action of the spiral stirring rod 432, further enhances the mixing effect. After the uniformly mixed material enters the temperature-controlled molding mechanism 3, under the segmented heating of the heating jacket 31 and the annular electric heating wire 32, and the heat insulation effect of the heat-insulating separating ring 34, the high-performance sealing component is formed.

[0062] Working principle: In use, the air pump 441 of the auxiliary stirring mechanism 44 is first started. The airflow is delivered to multiple mounting blocks 444 through the airflow channel 443 in the air storage housing 442. The air pressure in the airflow channel 443 increases, pushing the push plate 4465 in the first telescopic tube 4466 to move, compressing the pressure chamber of the first telescopic tube 4466. At the same time, it drives the rotating ring 4462 to rotate, causing the wedge block 4463 on the rotating ring 4462 to slide along the sliding groove 4464 of the mounting block 444, driving the mounting block 444 to rotate around its own axis, so that the nozzle 445 switches from the hidden state inside the mixing hopper 42 to the tilted state facing the inside of the mixing hopper 42. At the same time, during the movement of the push plate 4465, the ejector pin 4469 in the pressure chamber pushes the top ball of the one-way valve 4468, opening the one-way valve 4468. The airflow enters the first telescopic tube 4466 through the through hole of the push plate 4465. The pressure chamber is then conveyed to the nozzle 445 through the second telescopic tube 4467. The nozzle 445 sprays out airflow, forming a spiral upward airflow in the mixing hopper 42. The bottom of the mixing hopper 42 is sealed by the continuous upward airflow.

[0063] Then, the waste polytetrafluoroethylene raw material is fed into the first storage hopper 21 of the raw material testing mechanism 2. The first metering pump 23 is started, quantitatively conveying the raw material in the first storage hopper 21 to the first conveying pipe 22. The first electric valve 24 on the first conveying pipe 22 is adjusted to control the flow rate of the raw material in the first conveying pipe 22, extending the residence time of the raw material at the observation window 25. Then, the detector 26 is started, with its laser emitting end facing the flat transparent glass of the observation window 25, emitting laser light onto the raw material flowing through the observation window 25, and simultaneously receiving and analyzing the reflected signal to obtain data on the degree of degradation of the raw material molecular chain. The detector 26 transmits the detection data to the controller on the injection molding machine 1. The controller sends a control signal to the second metering pump 413 of the modifier filling mechanism 41 based on the received data on the degree of degradation of the raw material molecular chain. The second metering pump 413 is started, quantitatively extracting the modifier in the second storage hopper 411 and conveying it to the mixing hopper 42 through the second conveying pipe 412. Then, the second electric valve 414 on the second conveying pipe 412 near the mixing hopper 42 is opened, and the modifier enters the mixing hopper 42. Then, the motor 431 of the mixing and stirring mechanism 43 is started, driving the spiral stirring rod 432 to rotate coaxially, stirring the raw materials and modifier in the mixing hopper 42; and cooperating with the spiral upward airflow formed in the mixing hopper 42, the mixing work is completed.

[0064] After mixing is complete, the air pump 441 stops working, the air pressure in the airflow channel 443 decreases, the one-way valve 4468 automatically closes, and the ejector pin 4469 resets; the push plate 4465 resets under the action of the elastic force of the first telescopic tube 4466 and the torsion spring 4461, driving the rotating ring 4462 to rotate in the opposite direction; the mounting block 444 resets along with the rotating ring 4462, and the nozzle 445 is hidden again in the inner wall of the mixing hopper 42; and the mixed material is introduced from the bottom of the mixing hopper 42 into the injection tube of the injection molding machine 1 under the action of gravity.

[0065] When the uniformly mixed material in the mixing hopper 42 enters the operating area of ​​the temperature-controlled molding mechanism 3, the controller sends a heating parameter signal to the temperature-controlled molding mechanism 3 based on the data on the degradation degree of the raw material molecular chain. Multiple annular electric heating wires 32, coaxially sleeved within the heating jacket 31 at the injection end of the injection tube of the injection molding machine 1, start heating at a preset power. Heat is transferred to the heating jacket 31 through the thermally conductive silicone between the heating jacket 31 and the annular electric heating wires 32. The insulation cotton 33 outside the heating jacket 31 reduces heat loss, and the heat-insulating separation rings 34 between adjacent heating jackets 31 block heat conduction interference, achieving segmented temperature-controlled heating. Under segmented temperature control conditions, the material completes the molding of the polytetrafluoroethylene (PTFE) seal through the injection molding machine 1.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-performance polytetrafluoroethylene (PTFE) sealing component molding device for recycling waste plastics, comprising an injection molding machine (1), characterized in that: The injection molding machine (1) is equipped with a raw material detection mechanism (2), a temperature control molding mechanism (3), and a molecular chain crosslinking reinforcement mechanism (4); the raw material detection mechanism (2) includes a first storage hopper (21) located above the injection molding machine (1), and the raw material detection mechanism (2) is used to detect the degree of molecular chain degradation of polytetrafluoroethylene plastic in the first storage hopper (21); The temperature-controlled molding mechanism (3) is used to heat polytetrafluoroethylene plastic in segments according to the detection results of the raw material detection mechanism (2); the molecular chain crosslinking reinforcement mechanism (4) includes: A mixing hopper (42) is located below a first storage hopper (21), and the discharge end of the first storage hopper (21) is connected to the mixing hopper (42). Modifier filling mechanism (41), wherein the modifier filling mechanism (41) is disposed on one side of the first storage hopper (21); A mixing and stirring mechanism (43) is provided in the mixing hopper (42); And an auxiliary stirring mechanism (44), the auxiliary stirring mechanism (44) includes an air pump (441) installed on the injection molding machine (1) and a plurality of nozzles (445) installed on the bottom side wall of the mixing hopper (42); the air outlet of the air pump (441) is connected to the plurality of nozzles (445); when the air pump (441) forms an upward airflow at the bottom of the mixing hopper (42) through the nozzles (445), the upward airflow counteracts the gravity of the raw material, allowing the raw material to be stirred and mixed in the mixing hopper (42); The auxiliary stirring mechanism (44) includes a gas storage shell (442), a linkage mechanism (446), and multiple mounting blocks (444). The gas storage shell (442) is coaxially sleeved at the bottom of the mixing hopper (42). An airflow channel (443) is provided inside the gas storage shell (442). A rotating shaft is fixed on each of the multiple mounting blocks (444). The mounting blocks (444) are rotatably connected to the mixing hopper (42) through the rotating shaft. The nozzle (445) is mounted on the mounting block (444). The output end of the air pump (441) is connected to the nozzle (445) on the multiple mounting blocks (444) through the airflow channel (443). The linkage mechanism (446) is located in the gas storage shell (442) and is used to drive the mounting blocks (444) to rotate around the axis of the rotating shaft, so that the nozzle (445) is tilted towards the inside of the mixing hopper (42) or hidden in the inner wall of the mixing hopper (42). The linkage mechanism (446) includes a rotating ring (4462), multiple torsion springs (4461), wedge blocks (4463), push plates (4465), a first telescopic tube (4466), and a second telescopic tube (4467). The rotating ring (4462) is coaxially rotatably connected to the mixing hopper (42), and the multiple wedge blocks (4463) are equally spaced around the rotating ring (4462). The mounting block (444) has a groove (4464) adapted to the wedge blocks (4463), and the wedge blocks (4463) are slidably connected in the groove (4464). The multiple push plates (4465) are all fixed to the rotating ring (4462), and the push plates (4465) are slidably connected to the mixing hopper (4467). One end of the plate (4465) is inserted into the airflow channel (443) of the gas storage shell (442). Multiple first telescopic tubes (4466) are arranged at equal intervals around the mixing hopper (42) in the airflow channel (443). The push plate (4465) is located in the middle of the first telescopic tubes (4466) and divides the first telescopic tubes (4466) into a connecting chamber and a pressure chamber. One end of the connecting chamber of the first telescopic tube (4466) is connected to the airflow channel (443). The pressure chamber of the first telescopic tube (4466) is connected to the nozzle (445) on the mounting block (444) through the second telescopic tube (4467). The push plate (4465) has a through hole, and the connecting chamber and the pressure chamber are connected through the through hole. The linkage mechanism (446) also includes a one-way valve (4468) coaxially installed in the through hole. A pin (4469) is provided in the pressure chamber of the first telescopic tube (4466). One end of the pin (4469) is aligned with the top ball on the one-way valve (4468). When the air pressure in the airflow channel (443) increases, the push plate (4465) is allowed to move, compressing the pressure chamber in the first telescopic tube (4466), thereby allowing the pin (4469) to push the top ball on the one-way valve (4468) to move, so that the one-way valve (4468) opens.

2. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 1, characterized in that: The raw material testing mechanism (2) includes a first conveying pipe (22), a first metering pump (23), an observation window (25), and a detector (26); the first storage hopper (21) and the mixing hopper (42) are connected through the first conveying pipe (22), the first metering pump (23) is installed on the injection molding machine (1), one end of the first metering pump (23) is connected to the discharge end of the first storage hopper (21), and the other end of the first metering pump (23) is connected to the mixing hopper (42) through the first conveying pipe (22); an observation window (25) is provided on the first conveying pipe (22), and a flat transparent glass is installed on the observation window (25); the detector (26) is installed on the injection molding machine (1), and the laser emitting end of the detector (26) faces the observation window (25).

3. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 2, characterized in that: The raw material testing mechanism (2) also includes a first electric valve (24) disposed on the first conveying pipe (22); the first electric valve (24) allows the flow rate of the raw material in the first conveying pipe (22) to be controlled, so as to increase the residence time of the raw material at the observation window (25).

4. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 1, characterized in that: The temperature-controlled molding mechanism (3) includes multiple heating sleeves (31), annular electric heating wires (32), and insulation cotton (33); the multiple heating sleeves (31) are coaxially sleeved on the injection end of the injection tube of the injection molding machine (1), the annular electric heating wires (32) are sleeved inside the heating sleeves (31), and the gap between the heating sleeves (31) and the annular electric heating wires (32) is filled with thermally conductive silicone; the insulation cotton (33) is sleeved on the heating sleeves (31). Each of the adjacent heating sleeves (31) is provided with a heat insulation partition ring (34) on the same axis; the heat insulation partition ring (34) is an integrally formed structure of zirconia ceramic material.

5. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 2, characterized in that: The modifier filling mechanism (41) includes a second storage hopper (411), a second conveying pipe (412), a second metering pump (413), and a second electric valve (414). The second storage hopper (411) is located above the mixing hopper (42), and the second storage hopper (411) and the mixing hopper (42) are connected through the second conveying pipe (412). The second electric valve (414) is installed on the second conveying pipe (412) at one end near the mixing hopper (42). The second metering pump (413) is installed on the injection molding machine (1), and one end of the second metering pump (413) is connected to the outlet of the second storage hopper (411). The other end of the second metering pump (413) is connected to the mixing hopper (42) through the second conveying pipe (412).

6. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 5, characterized in that: The injection molding machine (1) is equipped with a controller, which is connected to the detector (26) and the second metering pump (413) via signal control.

7. The polytetrafluoroethylene high-performance sealing component molding device for recycling waste plastics according to claim 1, characterized in that: The mixing mechanism (43) includes a motor (431) and a spiral stirring rod (432); the motor (431) is installed on the top of the mixing hopper (42); the spiral stirring rod (432) is coaxially connected to the output end of the motor (431) and is used to stir and mix the raw materials in the mixing hopper (42).

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