Processing device and process for mixing polytetrafluoroethylene and filling material

Abstract

The invention relates to the technical field of plastic processing, in particular to a processing device and process for mixing polytetrafluoroethylene and a filling material. Self-sealing feeding mechanisms are respectively mounted at the tops of two pretreatment tanks which are arranged in parallel in pairs; the turning and drying mechanism is rotationally mounted at the bottom of the inner cavity of the pretreatment tank and is provided with an air outlet hole; the material turning driving part is provided with a hollow shaft which synchronously drives the two material turning and drying mechanisms to vertically rotate; the dry hot air circulating mechanism is used for sucking water-containing air in the pretreatment tank, drying the water-containing air and rotationally supplying the water-containing air into the hollow shaft; feeding valves are arranged between the two ends of the top of the mixing shell with the two ends collecting towards the middle and the bottom of the pretreatment tank; the stirring motor is used for driving the cage-shaped stirring mechanism to rotate in the mixing shell; the outer end of the radial stirring mechanism rotationally sleeves the middle part of the cage-shaped stirring mechanism and rotates along with the rotation of the cage-shaped stirring mechanism; an inlet of the discharging auger is formed in the middle of the bottom of the mixing shell. Therefore, the polytetrafluoroethylene and the filler can be efficiently and uniformly mixed.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing, and specifically to a processing device and process for mixing polytetrafluoroethylene with a filler material. Background Art

[0002] Polytetrafluoroethylene (Teflon or PTFE), commonly known as the "king of plastics", is a high-molecular compound polymerized from tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing performance, high lubricity and non-stickiness, electrical insulation, and good anti-aging endurance. It is generally applied to corrosion-resistant pipelines, containers, pumps, valves with relatively high performance requirements, as well as radar, high-frequency communication equipment, radio equipment, etc.

[0003] With the rapid development of science and technology, many fields have higher requirements for the mechanical strength and wear resistance of plastic materials. Therefore, it is necessary to add filler materials such as graphite, carbon black, molybdenum disulfide, glass fiber, carbon fiber, polyphenylene sulfide, etc. to polytetrafluoroethylene to process it into composite plastics, so as to achieve the effect of improving the creep characteristics and wear resistance of plastics. Therefore, when processing composite plastics, it is often necessary to use a mixing device to fully mix polytetrafluoroethylene with the filler material.

[0004] Most of the existing mixing devices pour various polytetrafluoroethylene and filler materials into the container structure of the mixing device together, and then use a stirring mechanism to achieve the mixing of multiple materials. However, in the actual processing process, it is easy to have a phenomenon of accumulation of various raw materials in the container structure, and most of the existing stirring mechanisms can only stir in one direction, with low mixing efficiency. In addition, due to the easy agglomeration of polytetrafluoroethylene and the filler due to the difference in surface properties, it is difficult to mix them evenly, thus affecting the performance of the composite plastic.

[0005] Therefore, when processing composite plastics at present, there is an urgent need for a mixing device and a mixing process that can efficiently and evenly mix polytetrafluoroethylene with the filler material. Summary of the Invention

[0006] The purpose of the present invention is to provide a processing device and process for mixing polytetrafluoroethylene with a filler material, so as to solve the problem that it is difficult for the existing mixing device to achieve efficient and uniform mixing of polytetrafluoroethylene with the filler.

[0007] To achieve the above object, the present invention provides the following technical solutions: Excessive water content in polytetrafluoroethylene and the filler will damage the interfacial bonding force between the two, and decomposition is likely to occur during mixing; in addition, it is difficult to ensure the compatibility between the filler itself and polytetrafluoroethylene. In view of the above problems, for the processing device for mixing polytetrafluoroethylene and the filler, it is necessary to provide a drying mechanism for drying polytetrafluoroethylene and the filler before mixing and a mechanism for surface activation treatment of the filler. Therefore, two pretreatment tanks are provided respectively for the pretreatment before mixing polytetrafluoroethylene and the filler. The two pretreatment tanks are arranged in parallel in pairs so as to facilitate the setting of a material turning driving member between the two pretreatment tanks. In addition, a turning and drying mechanism is rotatably installed at the bottom of the inner cavity of the pretreatment tank and has micropores on its surface. The material turning driving member has a hollow shaft that synchronously drives the turning and drying mechanisms on both sides to rotate vertically. The two ends of the inner cavity of the hollow shaft are respectively communicated with the micropores; a dry hot air circulation mechanism is used to suck the water-containing air in the pretreatment tank and supply dry hot air into the hollow shaft in a rotating manner after drying treatment. The operation of drying and removing water in the two pretreatment tanks is synchronously realized. Since the coupling agent added to the filler requires a high-temperature environment to achieve the surface activation treatment of the filler, during the hot air drying treatment process, the operation of surface activation and coating of the coupling agent on the filler is synchronously completed.

[0008] To ensure the sealing performance of the pretreatment tank, the feeding mechanism is of a self-sealing type, that is, the self-sealing feeding mechanism is installed at the top of the pretreatment tank and maintains the dynamic seal between the top and bottom of its inner cavity during the feeding process into the pretreatment tank. A feed valve is installed at the bottom end of the pretreatment tank for discharging the polytetrafluoroethylene and the filler after pretreatment.

[0009] Both ends of the top of the mixing housing are respectively connected to the bottom end of the feed valve and have a shape of aggregating from both ends to the middle; a cage-shaped stirring mechanism is rotatably installed in the mixing housing; a stirring motor is used to drive the cage-shaped stirring mechanism to rotate; a plurality of radial stirring mechanisms are circumferentially distributed, and the outer ends are respectively rotatably sleeved on the middle part of the cage-shaped stirring mechanism and rotate self-rotatingly with the rotation of the cage-shaped stirring mechanism; the cage-shaped stirring mechanism and the radial stirring mechanism provide multi-directional material turning and mixing operations for the mixed material, so as to facilitate the efficient mixing of the mixed material and ensure uniform mixing. The inlet of the discharging auger is arranged at the middle of the bottom of the mixing housing to facilitate the rapid discharging of the uniformly mixed mixed material to avoid the phenomenon of material accumulation and improve the mixing efficiency.

[0010] Preferably, the pretreatment tank includes a vertical cylinder, a hemispherical shell connected to the bottom end of the vertical cylinder, bushings fixedly sleeved on the bottom ends of both side walls of the vertical cylinder, and an air outlet interface sleeved on the outer edge of the top surface of the vertical cylinder. The bottom of the self-sealing feeding mechanism is fixed to the top surface of the vertical cylinder. A rectangular opening corresponding to the outlet of the self-sealing feeding mechanism is provided in the center of the top surface of the vertical cylinder. The air outlet interface is connected to the inlet of the dry hot air circulation mechanism. The bushings are used to rotatably support the material turning and drying mechanism. The top of the feeding valve is centrally installed at the bottom of the hemispherical shell. Among them, the setting of the hemispherical shell facilitates providing a space for the vertical turning of the material turning and drying mechanism.

[0011] Preferably, the self-sealing feeding mechanism includes a connection shell fixedly connected to the top surface of the pretreatment tank at the bottom, a hopper fixed to the rear part of the top surface of the connection shell, a shaft rod rotatably sleeved at the middle parts of both side walls of the connection shell at both ends, and a plurality of sealing plates fixedly arranged on the outer peripheral wall of the shaft rod along the circumferential direction and extending radially respectively. A feeding port is provided at the rear part of the top surface of the connection shell corresponding to the bottom port of the hopper. A material passing port is provided at the rear part of the bottom surface of the connection shell. A cylindrical cavity with an inner wall in frictional contact with the outer edge of the sealing plate is arranged in the connection shell. The front parts of the top and bottom ends of the cylindrical cavity are respectively communicated with the feeding port and the material passing port. Among them, the outer edge of the sealing plate is coated with a flexible polyurethane layer to ensure the sealing and wear resistance of the sealing performance of the sealing plate.

[0012] Preferably, the material turning and drying mechanism includes an annular pipe, short shafts and short pipes fixedly sleeved on both sides of the annular pipe and rotatably sleeved with the bushings respectively, and a plurality of round pipes arranged in the ring of the annular pipe and sleeved on the inner peripheral wall of the annular pipe at both ends. The micropores are arranged on the peripheral wall of the round pipe. The short pipes are respectively fixedly sleeved on the ends of the hollow shaft. Among them, the outer diameter of the annular pipe is slightly smaller than the inner diameters of the hemispherical shell and the vertical cylinder.

[0013] Preferably, the material turning driving member further includes a gear box arranged between the bottoms of the two pretreatment tanks and rotatably sleeved with the middle parts of both sides of the hollow shaft on both side walls, a material turning motor assembled on the top surface of the gear box and with the bottom end of the power output shaft extending into the inner cavity of the gear box, a bevel gear one fixedly sleeved on the bottom end of the power output shaft of the material turning motor, and a bevel gear two fixedly sleeved on one side of the middle part of the hollow shaft and meshing with the bevel gear one. The inner cavity bottom of the gear box is filled with gear oil at an appropriate oil level.

[0014] Preferably, the dry hot air circulation mechanism includes a circulation air pump, an air outlet pipe connected to the output end of the circulation air pump, an electric heating sleeve sleeved outside the air outlet pipe, an annular shell with its top end sleeved with the bottom end of the air outlet pipe and rotatably sleeved and matched with the hollow shaft, a fixing seat for fixedly supporting the annular shell, a water removal structure with its bottom sleeved with the input end of the circulation air pump, and an air inlet pipe with one end sleeved with the top of the water removal structure and the other end sleeved with the air outlet interface. A plurality of air outlet openings are provided on the inner peripheral wall of the annular shell along the circumferential direction, and a plurality of air inlet openings are provided on the circumferential wall of the hollow shaft corresponding to the air outlet openings. A rotating sealing mechanism is provided between the two end portions of the inner cavity of the annular shell and the hollow shaft to ensure airtightness.

[0015] Preferably, the mixing shell includes a straight cylinder part, conical shell bodies fixedly docked at both ends of the straight cylinder part, an annular cover fixedly connected to the middle of the outer peripheral wall of the straight cylinder part, a feed pipe head fixedly connected to the outer end of the top of the conical shell body and docked with the bottom end of the feed valve, and bases respectively used for fixedly supporting the bottoms of the conical shell bodies at both sides of the top. An annular groove is provided in the middle of the straight cylinder part corresponding to the inner cavity of the annular cover. A discharge port corresponding to the inlet of the discharge auger is provided at the bottom of the straight cylinder part on one side of the annular groove. A discharge cylinder extending along its axial direction is fixed at the bottom of the conical shell body close to the discharge port. The inner end top of the discharge cylinder is fixedly fitted at the discharge port. The discharge auger is rotatably sleeved in the discharge cylinder. The middle part of the cage-shaped stirring mechanism is rotatably sleeved in the annular groove. The stirring motor is arranged on the outer end face of one of the conical shell bodies.

[0016] Preferably, the cage-shaped stirring mechanism includes a rotating ring rotatably installed in the annular groove, a circular plate rotatably sleeved at the outer end of the inner cavity of the conical shell body, and a plurality of slats with both ends respectively connected to the outer edge of the inner side wall of the circular plate and the middle fixed to the inner peripheral wall of the rotating ring. A plurality of shaft rings rotatably sleeved and matched with the outer ends of the radial stirring mechanism are provided on the rotating ring along the circumferential direction. The center of the circular plate at one end is fixedly sleeved on the power output shaft of the stirring motor.

[0017] Preferably, the radial stirring mechanism includes a rotating shaft rotatably sleeved in the shaft ring and extending radially inward at the inner end into the inner cavity of the cage-shaped stirring mechanism, a mixing strip plate fixedly arranged on the outer peripheral wall of the rotating shaft along the radial direction, and a third bevel gear fixedly sleeved on the outer end of the rotating shaft. A bevel gear disk meshing with the third bevel gear is fixed on one side wall of the inner cavity of the annular groove.

[0018] A processing technology for mixing polytetrafluoroethylene and filling materials includes the following steps: S1. Put polytetrafluoroethylene powder into the corresponding pretreatment tank through one of the self-sealing feeding mechanisms, and put fillers and coupling agents into the corresponding pretreatment tank through the other self-sealing feeding mechanism; S2. Start the turning drive part and the dry hot air circulation mechanism, so that the turning and drying mechanism stirs and dries the corresponding materials with hot air; Among them, the temperature of the dry hot air supplied into the hollow shaft by the dry hot air circulation mechanism is 100 - 150 °C, and the drying time is preferably 2 - 4 h. A humidity sensor can be set at the top of the inner cavity of the pretreatment tank to monitor the moisture content of the materials, and the temperature of the drying air is controlled by a temperature control system to realize the automatic control of the drying and activation treatment of the materials; S3. The dried polytetrafluoroethylene powder, the mixture of filler and coupling agent are respectively discharged into the mixing housing through the feed valve; S4. Start the stirring motor, so that the cage-shaped stirring mechanism and the radial stirring mechanism carry out multi-directional mixing of the mixture in the mixing housing; S5. Discharge the mixed and evenly stirred mixture through the discharge auger.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The processing device and process for mixing polytetrafluoroethylene and filling materials involved in the present invention are not only convenient for synchronously drying and removing water from polytetrafluoroethylene and the filler before mixing, ensuring the interfacial bonding force between the two; but also carry out surface activation coating treatment of the coupling agent on the filler, improving the compatibility between polytetrafluoroethylene and the filler, and ultimately beneficial to improving the mechanical strength, corrosion resistance and other properties of the products.

[0020] 2. The processing device and process for mixing polytetrafluoroethylene and filling materials involved in the present invention can carry out multi-directional turning and mixing when mixing polytetrafluoroethylene and the filler, and is convenient for discharging, which preferably solves the problem that it is difficult for mixing equipment to achieve efficient and uniform mixing of polytetrafluoroethylene and the filler. Brief Description of the Drawings

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the whole of the present invention; Figure 2 It is a three-dimensional structure schematic diagram of the pretreatment tank of the present invention; Figure 3 It is a three-dimensional structure schematic diagram of the self-sealing feeding mechanism of the present invention; Figure 4 It is a three-dimensional structure schematic diagram of the turning and drying mechanism of the present invention; Figure 5 It is a three-dimensional structure schematic diagram of the turning drive part of the present invention; Figure 6 It is a three-dimensional structure schematic diagram of the dry hot air circulation mechanism of the present invention; Figure 7 It is a three-dimensional structure schematic diagram of the mixing housing of the present invention; Figure 8 This is a schematic three-dimensional structure diagram of the cage-shaped stirring mechanism of the present invention; Figure 9 This is a schematic three-dimensional structure diagram of the radial stirring mechanism of the present invention; Figure 10 This is the present invention Figure 1 An enlarged structure diagram of part A in; Figure 11 This is the present invention Figure 1 An enlarged structure diagram of part B in.

[0022] In the figure: 1 - pretreatment tank; 101 - vertical cylinder; 1011 - rectangular opening; 102 - hemispherical shell; 103 - shaft sleeve; 104 - air outlet interface; 2 - self-sealing feeding mechanism; 201 - connecting shell; 2011 - cylindrical cavity; 2012 - feeding port; 2013 - material passing port; 202 - hopper; 203 - shaft rod; 204 - sealing plate; 3 - material turning and drying mechanism; 301 - annular pipe; 302 - short shaft; 303 - short pipe; 304 - circular pipe; 3041 - micropores; 4 - material turning driving part; 401 - gear box; 402 - hollow shaft; 4021 - air inlet; 403 - material turning motor; 404 - bevel gear one; 405 - bevel gear two; 5 - dry hot air circulation mechanism; 501 - circulation air pump; 502 - air outlet pipe; 503 - electric heating sleeve; 504 - annular shell; 5041 - air outlet; 505 - fixing seat; 506 - water removal structure; 507 - air inlet pipe; 6 - mixing shell; 601 - straight cylinder part; 6011 - annular groove; 6012 - discharge port; 602 - frustum shell; 603 - annular cover; 604 - feed pipe head; 605 - discharge cylinder; 606 - bevel gear disc; 607 - base; 7 - feed valve; 8 - cage-shaped stirring mechanism; 801 - rotating ring; 8011 - shaft collar; 802 - circular plate; 803 - slats; 9 - radial stirring mechanism; 901 - rotating shaft; 902 - bevel gear three; 903 - stirring slat plate; 10 - stirring motor; 11 - discharge auger. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-11 , the present invention provides a technical solution for a processing device for mixing polytetrafluoroethylene and a filling material.

[0025] Two pretreatment tanks 1 are arranged in parallel in pairs. Each pretreatment tank 1 includes a vertical cylinder 101, a hemispherical shell 102 connected to the bottom end of the vertical cylinder 101, a shaft sleeve 103 fixedly sleeved on the bottom ends of the two side walls of the vertical cylinder 101, and an air outlet interface 104 sleeved on the outer edge of the top surface of the vertical cylinder 101. A rectangular opening 1011 is provided in the center of the top surface of the vertical cylinder 101.

[0026] Two self-sealing feeding mechanisms 2 are respectively installed on the tops of the two pretreatment tanks 1 and maintain dynamic sealing between the top and bottom of the inner cavity during the feeding process into the pretreatment tanks 1. Among them, the self-sealing feeding mechanism 2 includes a connecting shell 201 fixedly connected to the top surface of the vertical cylinder 101 at the bottom, a hopper 202 fixed to the rear part of the top surface of the connecting shell 201, a shaft rod 203 rotatably sleeved at the middle parts of the two side walls of the connecting shell 201 at both ends, and a plurality of sealing plates 204 uniformly fixed on the outer peripheral wall of the shaft rod 203 along the circumferential direction and respectively extending radially. An inlet 2012 is provided on the rear part of the top surface of the connecting shell 201 corresponding to the bottom port of the hopper 202, and a material passing port 2013 is provided on the rear part of the bottom surface of the connecting shell 201. The material passing port 2013 is directly opposite to the rectangular opening 1011. A cylindrical cavity 2011 is provided in the connecting shell 201, and the inner wall of the cylindrical cavity 2011 is in frictional contact with the outer edge of the sealing plate 204. The rear parts of the top and bottom ends of the cylindrical cavity 2011 are respectively communicated with the inlet 2012 and the material passing port 2013. When the material is poured into the hopper 202, the material forms a downward pressure on the sealing plate 204 located at the rear side position, so as to realize the continuous rotation of the impeller mechanism composed of the sealing plate 204 and the shaft rod 203. The included angle between two adjacent sealing plates 204 is smaller than the central angle corresponding to the arc surface between the top end of the material passing port 2013 and the bottom end of the corresponding inlet 2012 on one side, so as to ensure that the sealing plate 204 can always avoid the phenomenon of communication between the top and bottom of the inner cavity of the connecting shell 201 during the flipping process.

[0027] The material turning and drying mechanism 3 is rotatably installed at the bottom inside the pretreatment tank 1 and has micropores 3041 on its surface. Among them, the material turning and drying mechanism 3 includes an annular pipe 301, short shafts 302 and short pipes 303 fixedly sleeved on both sides of the annular pipe 301 and rotatably sleeved with the shaft sleeves 103 respectively, and a plurality of circular pipes 304 arranged inside the ring of the annular pipe 301 and sleeved on the inner peripheral wall of the annular pipe 301 at both ends. The micropores 3041 are arranged on the peripheral wall of the circular pipe 304. That is, the short shafts 302 and the short pipes 303 support the annular pipe 301 to vertically rotate in the space at the bottom inside the hemispherical shell 102 and the vertical cylinder 101. High-temperature drying gas is blown out from the micropores 3041. Coupled with the material turning mechanism composed of the annular pipe 301 and the circular pipe 304 continuously turning the material up and down, the hot air drying process of the material is efficiently completed. In addition, in order to ensure the material turning effect of the material turning mechanism composed of the annular pipe 301 and the circular pipe 304, the outer diameter of the annular pipe 301 should be as close as possible to the inner diameters of the vertical cylinder 101 and the hemispherical shell 102.

[0028] The material turning driving part 4 is arranged between the bottoms of the two pretreatment tanks 1 and has a hollow shaft 402 that synchronously drives the material turning and drying mechanisms 3 on both sides to rotate vertically. The two ends inside the cavity of the hollow shaft 402 are respectively communicated with the micropores 3041. Among them, the short pipes 303 on both sides are respectively fixedly sleeved on the two ends of the hollow shaft 402. The material turning driving part 4 further includes a gear box 401 arranged between the bottoms of the two pretreatment tanks 1 and rotatably sleeved on both sides of the middle part of the hollow shaft 402 on both side walls, a material turning motor 403 assembled on the top surface of the gear box 401 and the bottom end of the power output shaft extending into the inner cavity of the gear box 401, a bevel gear one 404 fixedly sleeved on the bottom end of the power output shaft of the material turning motor 403, and a bevel gear two 405 fixedly sleeved on one side of the middle part of the hollow shaft 402 and meshing with the bevel gear one 404. A cross beam for fixedly supporting the gear box 401 is fixed between the two hemispherical shells 102. When the material turning motor 403 is started, the hollow shaft 402 is driven to rotate through the meshing transmission relationship of the bevel gear one 404 and the bevel gear two 405. The hollow shaft 402 drives the material turning and drying mechanisms 3 on both sides to rotate vertically synchronously.

[0029] The dry and hot air circulation mechanism 5 is used to suck the water-containing air in the pretreatment tank 1 and supply the dried hot air to the inside of the hollow shaft 402 in a rotational manner after drying treatment. Among them, the dry and hot air circulation mechanism 5 includes a circulation air pump 501, an air outlet pipe 502 connected to the output end of the circulation air pump 501, an electric heating sleeve 503 sleeved outside the air outlet pipe 502, an annular housing 504 with its top end sleeved with the bottom end of the air outlet pipe 502 and rotationally sleeved and matched with the hollow shaft 402, a fixing seat 505 for fixedly supporting the annular housing 504, a water removal structure 506 with its bottom end sleeved with the input end of the circulation air pump 501, and an air inlet pipe 507 with one end sleeved on the top of the water removal structure 506 and the other end sleeved with the air outlet interface 104. A plurality of air outlet openings 5041 are provided along the circumferential direction on the inner peripheral wall of the annular housing 504, and a plurality of air inlet openings 4021 are provided on the circumferential wall of the hollow shaft 402 corresponding to the air outlet openings 5041. In order to facilitate real-time monitoring of the water content in the air at the input end of the water removal structure 506, a humidity sensor is provided in the air outlet interface 104, and the electric heating sleeve 503 is controlled for heating temperature by a temperature control system. The water removal structure 506 adopts an adsorption dryer. That is, since the air inlet openings 4021 and the air outlet openings 5041 can ensure an intercommunicating state during the rotation process. The air dried by the water removal structure 506 is pumped into the air outlet pipe 502 by the circulation air pump 501, and the dry air flowing through the air outlet pipe 502 is heated by the electric heating sleeve 503 to form dried hot air. The dried hot air sequentially enters the inner cavity of the hollow shaft 402 through the inner cavity of the annular housing 504, the air outlet openings 5041, and the air inlet openings 4021, and then enters the annular pipe 301 through the short pipe 303. The dried hot air in the annular pipe 301 is distributed to each round pipe 304 and finally discharged from the micropores 3041. The air that takes away the moisture in the material flows back to the water removal structure 506 through the air outlet interface 104 and the air inlet pipe 507 for water treatment, thus forming a circulating air flow. In order to prevent the material from being discharged through the air outlet interface 104 along with the water-containing air, a filter membrane structure is provided at the inner port of the air outlet interface 104. In addition, a suitable vertical support frame is provided at the rear side of the equipment for fixedly supporting the pretreatment tank 1 and the water removal structure 506 (not shown in the figure), and the circulation air pump 501 is fixedly assembled on the outer wall of the water removal structure 506.

[0030] The tops of the two feeding valves 7 are respectively installed at the bottoms of the two hemispherical shells 102.

[0031] The two ends of the top of the mixing housing 6 are respectively connected to the bottom ends of the feed valves 7, and it has a shape that aggregates from both ends to the middle. Among them, the mixing housing 6 includes a straight cylinder part 601, frustum-shaped housings 602 fixedly docked at both ends of the straight cylinder part 601, an annular cover 603 fixedly connected to the middle of the outer peripheral wall of the straight cylinder part 601, a feed pipe head 604 fixedly connected to the outer end of the top of the frustum-shaped housing 602 and docked with the bottom end of the feed valve 7, and bases 607 respectively used to fixedly support the bottom of the frustum-shaped housing 602 at the top ends on both sides. An annular groove 6011 is provided in the middle of the straight cylinder part 601 corresponding to the inner cavity of the annular cover 603. An outlet 6012 is provided at the bottom of the straight cylinder part 601 on one side of the annular groove 6011. A discharge cylinder 605 extending along its axis is fixedly provided at the bottom of the frustum-shaped housing 602 near the outlet 6012. The top of the inner end of the discharge cylinder 605 is fixedly fitted at the outlet 6012.

[0032] The discharge auger 11 is rotatably sleeved in the discharge cylinder 605. During the mixing process, the inlet of the discharge auger 11 faces downward, and the outlet faces upward, that is, the inner end of the cylindrical shell of the discharge auger 11 seals the outlet 6012; when discharging is required, the discharge auger 11 is rotated 180°, so that its inlet is aligned with the outlet 6012, and the outlet is turned downward, so as to facilitate discharging. In order to facilitate the automatic rotation of the discharge auger 11, an external gear ring can be fixedly sleeved at the position of the discharge auger 11 close to the outer end of the discharge cylinder 605, and a gear transmission mechanism driven by a servo motor is installed at the outer end of the discharge cylinder 605, and the gear meshes with the external gear ring to realize the automatic rotation operation of the discharge auger 11.

[0033] The cage-shaped stirring mechanism 8 includes a rotating ring 801 rotatably installed in the annular groove 6011, a circular plate 802 rotatably sleeved at the outer end of the inner cavity of the frustum-shaped housing 602, and a plurality of slats 803 respectively connected to the outer edges of the inner side walls of the circular plate 802 at both ends and fixed to the inner peripheral wall of the rotating ring 801 in the middle. A plurality of collar rings 8011 are provided on the rotating ring 801 along the circumferential direction. Support shaft members rotatably sleeved with the centers of the outer end faces of the two frustum-shaped housings 602 are respectively fixedly sleeved at the centers of the circular plate 802.

[0034] The stirring motor 10 is installed on the outer end face of one frustum-shaped housing 602. And the power output shaft of the stirring motor 10 is fixedly docked with the support shaft member corresponding to the center of the circular plate 802. That is, the stirring motor 10 is used to directly drive the whole cage-shaped stirring mechanism 8 to perform a rotary motion, so that the slats 803 continuously stir the mixed material.

[0035] A plurality of radial stirring mechanisms 9 are circumferentially distributed. The outer ends are respectively rotatably sleeved on the middle part of the cage-shaped stirring mechanism 8 and rotate self-rotatingly as the cage-shaped stirring mechanism 8 rotates. Among them, the radial stirring mechanism 9 includes a rotating shaft 901 rotatably sleeved in the collar 8011 and with the inner end extending radially into the inner cavity of the cage-shaped stirring mechanism 8, a mixing strip plate 903 fixed on the outer peripheral wall of the rotating shaft 901 along the radial direction, and a bevel gear three 902 fixedly sleeved on the outer end of the rotating shaft 901. A bevel gear disk 606 meshing with the bevel gear three 902 is fixed on one side wall of the inner cavity of the annular groove 6011. That is, when the cage-shaped stirring mechanism 8 rotates as a whole, it will drive the radial stirring mechanism 9 to rotate synchronously, so that the bevel gear three 902 and the bevel gear disk 606 rotate due to meshing, thereby realizing the self-rotation of the rotating shaft 901 driving the mixing strip plate 903. When the cage-shaped stirring mechanism 8 turns over and stirs the mixture, since the inner diameter of the outer end of the frustum-shaped shell 602 is smaller than the inner diameter of its inner end, the mixture tends to converge towards the straight cylinder part 601, and the mixing strip plate 903 rotating with the self-rotation of the rotating shaft 901 will turn the material towards both sides, so as to realize the multi-directional turning and mixing of the mixture, thereby improving the mixing effect and mixing efficiency.

[0036] The processing technology for the mixing of polytetrafluoroethylene and filler materials includes the following steps: S1. Put polytetrafluoroethylene powder into the corresponding pretreatment tank 1 through one of the self-sealing feeding mechanisms 2, and put filler and coupling agent into the corresponding pretreatment tank 1 through the other self-sealing feeding mechanism 2; Among them, the filler is graphite powder with a particle size of 20 - 50 μm, the coupling agent is γ-aminopropyltriethoxysilane; the selected polytetrafluoroethylene has a particle size of 50 - 100 μm; the mass ratio of polytetrafluoroethylene to graphite powder is 100:(20 - 30).

[0037] S2. Start the turning driving part 4 and the dry hot air circulation mechanism 5, so that the turning and drying mechanism 3 stirs and dries the corresponding materials with hot air; Among them, the temperature of the dry hot air supplied into the hollow shaft 402 by the dry hot air circulation mechanism 5 is 100 - 150 °C, and the treatment time is 2 - 4 h.

[0038] S3. The dried polytetrafluoroethylene powder and the mixture of filler and coupling agent are respectively discharged into the mixing housing 6 through the feed valve 7; Among them, the moisture content of the dried polytetrafluoroethylene and filler is not higher than 0.04%.

[0039] S4. Start the stirring motor 10, so that the cage-shaped stirring mechanism 8 and the radial stirring mechanism 9 mix the mixture in the mixing housing 6 in multiple directions; Among them, the rotation speed of the stirring motor 10 is 1800 - 3200 rpm.

[0040] S5. The mixture after mixing and stirring evenly is discharged through the discharge auger 11.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Processing device for mixing polytetrafluoroethylene with filler materials, characterized in that, Including: Pre-treatment tanks (1), arranged in pairs in parallel; Self-sealing feeding mechanism (2), installed at the top of the pre-treatment tank (1) and maintaining dynamic sealing between the top and bottom of its inner cavity during the feeding process into the pre-treatment tank (1); Turning and drying mechanism (3), rotatably installed at the bottom of the inner cavity of the pre-treatment tank (1) and having micropores (3041) on its surface; Turning drive member (4), arranged between the two pre-treatment tanks (1) and having a hollow shaft (402) that synchronously drives the turning and drying mechanisms (3) on both sides to rotate vertically. The two ends of the inner cavity of the hollow shaft (402) are respectively communicated with the micropores (3041); Dry hot air circulation mechanism (5), used for sucking the water-containing air in the pre-treatment tank (1) and rotatingly feeding dry hot air into the hollow shaft (402) after drying treatment; Feeding valve (7), installed at the bottom end of the pre-treatment tank (1); Mixing housing (6), the two ends of the top are respectively connected to the bottom end of the feeding valve (7) and has a shape that aggregates from both ends to the middle; Cage-shaped stirring mechanism (8), rotatably installed in the mixing housing (6); Stirring motor (10), used to drive the cage-shaped stirring mechanism (8) to rotate; Radial stirring mechanisms (9), distributed circumferentially in multiple numbers, and the outer ends are respectively rotatably sleeved on the middle part of the cage-shaped stirring mechanism (8) and rotate self-rotatingly with the rotation of the cage-shaped stirring mechanism (8); Discharging auger (11), the inlet of which is arranged at the center of the bottom of the mixing housing (6).

2. The processing device for mixing polytetrafluoroethylene and filling materials according to claim 1, wherein: The pre-treatment tank (1) includes a vertical cylinder (101), a hemispherical housing (102) connected to the bottom end of the vertical cylinder (101), a shaft sleeve (103) fixedly sleeved on the bottom ends of the two side walls of the vertical cylinder (101), and an air outlet interface (104) sleeved on the outer edge of the top surface of the vertical cylinder (101). The bottom of the self-sealing feeding mechanism (2) is fixed to the top surface of the vertical cylinder (101). A rectangular opening (1011) corresponding to the outlet of the self-sealing feeding mechanism (2) is arranged at the center of the top surface of the vertical cylinder (101). The air outlet interface (104) is connected to the inlet of the dry hot air circulation mechanism (5). The shaft sleeve (103) is used to rotatably support the turning and drying mechanism (3). The top of the feeding valve (7) is centrally installed at the bottom of the hemispherical housing (102).

3. The processing device for mixing polytetrafluoroethylene and filler materials according to claim 1, characterized in that: The self-sealing feeding mechanism (2) includes a connection housing (201) fixedly connected to the top surface of the pretreatment tank (1) at the bottom, a hopper (202) fixed to the rear part of the top surface of the connection housing (201), a shaft rod (203) rotatably sleeved at the middle parts of the two side walls of the connection housing (201) at both ends, and a plurality of sealing plates (204) fixedly arranged on the outer peripheral wall of the shaft rod (203) along the circumferential direction and extending radially respectively. An inlet (2012) is provided at the rear part of the top surface of the connection housing (201) corresponding to the bottom port of the hopper (202), a material passing port (2013) is provided at the rear part of the bottom surface of the connection housing (201), a cylindrical cavity (2011) with an inner wall in frictional contact with the outer edge of the sealing plate (204) is arranged in the connection housing (201), and the rear parts of the top and bottom ends of the cylindrical cavity (2011) are communicated with the inlet (2012) and the material passing port (2013) respectively.

4. The processing device for mixing polytetrafluoroethylene and filler materials according to claim 2, wherein: The material turning and drying mechanism (3) includes an annular pipe (301), a short shaft (302) and a short pipe (303) fixedly sleeved on both sides of the annular pipe (301) and rotatably sleeved with the shaft sleeve (103) respectively, and a plurality of round pipes (304) arranged in the ring of the annular pipe (301) and sleeved on the inner peripheral wall of the annular pipe (301) at both ends. The micropores (3041) are arranged on the peripheral wall of the round pipe (304), and the short pipes (303) are fixedly sleeved on the ends of the hollow shaft (402) respectively.

5. The processing device for mixing polytetrafluoroethylene and filling materials according to claim 1, characterized in that: The material turning driving member (4) further includes a gear box (401) arranged at the position between the bottoms of the two pretreatment tanks (1) and rotatably sleeved with the middle parts of both sides of the hollow shaft (402) on both side walls, a material turning motor (403) assembled on the top surface of the gear box (401) and with the bottom end of the power output shaft extending into the inner cavity of the gear box (401), a bevel gear one (404) fixedly sleeved on the bottom end of the power output shaft of the material turning motor (403), and a bevel gear two (405) fixedly sleeved on one side of the middle part of the hollow shaft (402) and meshing with the bevel gear one (404).

6. The processing device for mixing polytetrafluoroethylene and filler materials according to claim 2, wherein: The dry hot air circulation mechanism (5) includes a circulation air pump (501), an air outlet pipe (502) connected to the output end of the circulation air pump (501), an electric heating sleeve (503) sleeved outside the air outlet pipe (502), a ring-shaped housing (504) with the top end sleeved with the bottom end of the air outlet pipe (502) and rotatably sleeved with the hollow shaft (402) in a matching manner, a fixing seat (505) for fixedly supporting the ring-shaped housing (504), a water removing structure (506) with the bottom sleeved with the input end of the circulation air pump (501), and an air inlet pipe (507) with one end sleeved on the top of the water removing structure (506) and the other end sleeved with the air outlet interface (104). A plurality of air outlet openings (5041) are arranged on the inner peripheral wall of the ring-shaped housing (504) along the circumferential direction, and a plurality of air inlet openings (4021) are arranged on the peripheral wall of the hollow shaft (402) corresponding to the air outlet openings (5041).

7. The processing device for mixing polytetrafluoroethylene and filling materials according to claim 1, wherein: The mixing housing (6) includes a straight cylinder part (601), frustum-shaped housings (602) fixedly docked at both ends of the straight cylinder part (601), an annular cover (603) fixedly connected to the middle of the outer peripheral wall of the straight cylinder part (601), a feed pipe head (604) fixedly connected to the outer end of the top of the frustum-shaped housing (602) and docked with the bottom end of the feed valve (7), and bases (607) respectively used for fixedly supporting the bottom of the frustum-shaped housing (602) at both top ends on both sides. An annular groove (6011) is provided at a position in the middle of the straight cylinder part (601) corresponding to the inner cavity of the annular cover (603). An outlet (6012) corresponding to the inlet of the discharge auger (11) is provided at the bottom of the straight cylinder part (601) on one side of the annular groove (6011). A discharge cylinder (605) extending along its axis is fixedly provided at the bottom of the frustum-shaped housing (602) near the outlet (6012). The inner end top of the discharge cylinder (605) is fixedly fitted at the outlet (6012). The discharge auger (11) is rotatably sleeved in the discharge cylinder (605). The middle of the cage-shaped stirring mechanism (8) is rotatably sleeved in the annular groove (6011). The stirring motor (10) is installed on the outer end face of one of the frustum-shaped housings (602).

8. The processing device for mixing polytetrafluoroethylene and filling materials according to claim 7, wherein: The cage-shaped stirring mechanism (8) includes a rotating ring (801) rotatably installed in the annular groove (6011), a circular plate (802) rotatably sleeved at the outer end of the inner cavity of the frustum-shaped housing (602), and a plurality of slats (803) respectively connected to the outer edge of the inner side wall of the circular plate (802) at both ends and fixed to the inner peripheral wall of the rotating ring (801) in the middle. A plurality of collar rings (8011) for rotatably sleeving and matching with the outer ends of the radial stirring mechanisms (9) are provided on the rotating ring (801) along the circumferential direction. The center of the circular plate (802) at one end is fixedly sleeved on the power output shaft of the stirring motor (10).

9. The processing device for mixing polytetrafluoroethylene and filler materials according to claim 8, characterized in that: The radial stirring mechanism (9) includes a rotating shaft (901) rotatably sleeved in the collar ring (8011) and extending radially inward into the inner cavity of the cage-shaped stirring mechanism (8) at the inner end, a mixing strip plate (903) fixedly arranged on the outer peripheral wall of the rotating shaft (901) along the radial direction, and a third bevel gear (902) fixedly sleeved on the outer end of the rotating shaft (901). A bevel gear disk (606) meshing with the third bevel gear (902) is fixedly arranged on one side wall of the inner cavity of the annular groove (6011).

10. A processing process for mixing polytetrafluoroethylene with a filler, using the processing device for mixing polytetrafluoroethylene with a filler according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Put polytetrafluoroethylene powder into the corresponding pretreatment tank (1) through one of the self-sealing feeding mechanisms (2), and put filler and coupling agent into the corresponding pretreatment tank (1) through the other self-sealing feeding mechanism (2). S2. Start the turning driving part (4) and the dry hot air circulation mechanism (5) to make the turning and drying mechanism (3) perform stirring and hot air drying treatment on the corresponding materials. Wherein, the temperature of the dry hot air fed into the hollow shaft (402) by the dry hot air circulation mechanism (5) is 100 - 150 °C. S3. The dried polytetrafluoroethylene powder, as well as the mixture of the filler and the coupling agent, are respectively discharged into the mixing housing (6) through the feed valve (7); S4. Start the stirring motor (10) to make the cage-shaped stirring mechanism (8) and the radial stirring mechanism (9) perform multi-directional mixing on the mixture in the mixing housing (6); S5. Discharge the mixed and evenly stirred mixture through the discharge auger (11).

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