Rotary drying machine for ultra-high molecular weight polyethylene

Abstract

The rotary drying machine comprises a machine body which is a cylinder capable of rotating around the axis of the machine body, and further comprises a driving device which is connected with the machine body to drive the machine body to rotate, a plurality of supporting systems which do not affect rotation of the machine body are arranged outside the machine body, and the whole machine body is arranged in a downward inclined mode from left to right; the feeding box and the discharging box are arranged at the two axial ends of the machine body through sealing structures respectively; and the heating system is arranged in the machine body and used for indirectly heating the materials. According to the method, hot water with the temperature smaller than or equal to 100 DEG C is adopted for indirect heating in a closed circulation mode, so that the risk that a heating medium exceeds the softening point of UHMW-PE105 DEG C can be avoided, the problem that traditional steam temperature control lags behind is solved, and the material quality is guaranteed; by adopting a combined structure of the cylindrical supporting pipe and the smooth forward / reverse inclined shoveling plate, a material accumulation dead zone can be eliminated, the heat efficiency is improved, the material retention time is regulated and controlled, and the materials are prevented from being overheated and deteriorated.

Description

Technical Field

[0001] This invention mainly relates to the field of new materials technology, specifically a rotary dryer for ultra-high molecular weight polyethylene. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMW-PE) is a high-performance thermoplastic engineering plastic widely used in important fields such as high-end equipment manufacturing and medical devices due to its outstanding wear resistance, high impact resistance, and excellent self-lubricating properties. In its production process, the wet material obtained after the polymerization reaction needs to undergo a drying process to remove residual organic solvents, thereby obtaining a final product that meets standards.

[0003] Currently, the industry commonly uses rotary dryers with steam as the heat source to dry UHMW-PE materials. However, such traditional equipment has limitations: Firstly, it relies on steam for heating and indirectly controls the temperature by adjusting the steam pressure. However, the steam temperature usually exceeds 100°C, and the system response is lagging, resulting in insufficient temperature control accuracy. There is a risk that the actual steam temperature may momentarily exceed the material's softening point (approximately 105°C), leading to poor temperature control safety. Secondly, the equipment often uses flat support components perpendicular to the cylinder wall to fix the heating tubes. This type of structure easily forms a material accumulation area at the back. The accumulated material will deteriorate under long-term heating, affecting the overall product quality. Summary of the Invention

[0004] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. It primarily offers a rotary dryer for ultra-high molecular weight polyethylene (UHMW-PE), overcoming the limitations of mainstream steam-heated rotary dryers used for drying UHMW-PE materials, as mentioned in the background section. These limitations include: firstly, insufficient temperature control accuracy in steam heating, delayed system response, and steam temperatures frequently exceeding 100°C, easily surpassing the material's softening point of 105°C, resulting in poor temperature control safety; and secondly, the internal use of flat heating tubes supporting the vertical cylinder wall leads to material accumulation on the back, causing long-term heat-induced deterioration and impacting product quality.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A rotary dryer for ultra-high molecular weight polyethylene includes a body, which is a cylindrical body rotatable about its axis, and further includes: A drive device is connected to the body to drive its rotation. The body is provided with multiple support systems that do not affect its rotation, and the body as a whole is inclined downward from left to right. The feed box and discharge box are respectively set at both ends of the machine body through a sealing structure; The heating system, located inside the machine body, is used for indirect heating of materials; The heating system includes an external heat tracing pipe laid on the body of the machine and a heat exchange pipe located inside the body and extending along its axial direction. The heat exchange pipe and the external heat tracing pipe are evenly distributed on the body of the machine, and the external heat tracing pipe and / or the heat exchange pipe are connected to the inlet and outlet water distributor through a water distribution ring pipe located outside the body of the machine to form a closed hot water circulation loop. The machine body is equipped with a lifting plate assembly, which is used to push the material towards the discharge end when the machine body rotates, and at the same time can prevent the material from flowing too fast towards the discharge end.

[0006] Further preferably, the heating system also includes a support structure, which includes a support pipe and a support sleeve. One end of the support sleeve is connected to the cylinder wall of the machine body, and the other end is connected to the support sleeve. The support sleeve is fitted onto the outer wall of the heat exchange tube, and the support sleeve is spliced ​​from two semi-circular clamps, one of which is connected to the support pipe. The support structure is used to support and position the heat exchange tube.

[0007] More preferably, the interior of the casing is provided with uniformly and equidistantly distributed support reinforcing rings for auxiliary support of several heat exchange tubes arranged in a ring.

[0008] More preferably, the scraper assembly includes a forward-angled scraper and a reverse-angled scraper connected to the inner wall of the machine body, wherein only the forward-angled scraper is provided near both ends of the machine body, and the forward-angled scraper and the reverse-angled scraper are distributed alternately in the remaining areas; The inclined and reverse inclined lifting plates are evenly distributed along the machine body axis. The inclined direction of the inclined lifting plate is adapted to drive the material to push towards the discharge end when the machine body rotates. The inclined direction of the reverse inclined lifting plate is designed to block the material from flowing towards the discharge end.

[0009] More preferably, the inclination angle of the forward and reverse inclination plates is 30°-60°, and the surfaces of the forward and reverse inclination plates are smooth with no recessed areas.

[0010] More preferably, the device further includes a feeding sealing structure and a discharging sealing structure, wherein the feeding sealing structure is disposed at the connection between the feeding box and the machine body, and the discharging sealing structure is disposed at the connection between the discharging box and the machine body, and the feeding sealing structure and the discharging sealing structure are consistent.

[0011] More preferably, the discharge sealing structure includes a stuffing box, a support ring, a sealing curtain assembly, a packing, and a packing gland installed in the discharge box; The support ring is sleeved on the machine body and located inside the stuffing box, and it is made of ultra-high molecular weight polyethylene material; The sealing curtain assembly includes a sealing curtain made of ultra-high molecular weight polyethylene, and a pressure plate and a partition plate for clamping and fixing the sealing curtain, wherein the inner side of the sealing curtain is in dynamic contact with the rotating surface of the machine body. The air-sealing ring is disposed on the machine body and located between the support ring and the packing. The air-sealing ring has a plurality of air holes facing the surface of the machine body. The packing is filled inside the stuffing box and located on one side of the air seal ring. The packing gland is used to axially compress the packing. The pressure plate, partition plate, packing gland and stuffing box are connected in sequence by fasteners.

[0012] More preferably, the air seal annular ring is provided with an air inlet for connecting an external air source and introducing inert gas to form an air curtain seal in the area between the sealing curtain and the packing.

[0013] More preferably, the feed box is provided with a first exhaust gas outlet, the discharge box is provided with a second exhaust gas outlet, and both the first and second exhaust gas outlets are provided with a suction device, which is used to extract the exhaust gas inside the machine body, thus forming a double suction structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This rotary dryer uses hot water at a temperature below 100℃ as the heating medium and indirectly heats the material through a closed-loop circulation system consisting of heat exchange tubes, external heat tracing pipes, water distribution ring pipes, and inlet / outlet water distributors. This avoids the risk of the heat medium temperature exceeding the softening point of ultra-high molecular weight polyethylene (105℃). The system has stable temperature control and direct response, which can solve the problem of temperature runaway caused by the lag in pressure regulation in traditional steam heating. This ensures that the material will not denature, turn yellow, or clump due to overheating during the drying process, thus guaranteeing the high quality of the product.

[0015] 2. This rotary dryer employs a combination of cylindrical support tubes and smooth, inclined and reverse-inclined lifters with opposing driving forces on the axial flow of the material. These lifters are staggered within the main body of the drum, eliminating dead zones where material accumulates inside the equipment. The cylindrical support tubes have no back space for material accumulation, while the synergistic effect of the inclined and reverse-inclined lifters controls the axial movement speed of the material, extending the drying time. This ensures continuous renewal and uniform heating of the material within the drum, preventing the risk of localized material deterioration due to overheating from prolonged retention.

[0016] 3. This rotary dryer features a dual-extraction structure with exhaust outlets at the top of both the feed and discharge boxes, connected to extraction devices. This improves the uniformity and overall flow velocity of the drying medium within the cylinder, thereby enhancing the mass transfer driving force. It can more efficiently remove vaporized organic solvents from the material, thus improving drying efficiency. Furthermore, the equipment can operate flexibly and stably within a wide pressure range of -25 kPa to +4 kPa, meeting the specific pressure (or vacuum) requirements of different process stages.

[0017] 4. This rotary dryer employs a multi-stage combined sealing structure consisting of a dynamic air curtain formed by an ultra-high molecular weight polyethylene (UHMWPE) sealing curtain, a support ring, and an air seal ring, along with polytetrafluoroethylene (PTFE) packing. This achieves efficient sealing of both ends of the cylinder under rotational conditions. The UHMWPE sealing curtain has strong wear resistance and a certain degree of resilience, ensuring sealing performance and providing excellent wear resistance, thus extending the replacement cycle. It can be effectively used under both positive and negative pressure conditions. Furthermore, the air curtain seal forms a dynamic barrier between the contact seal and the packing seal, improving overall sealing performance. This allows the equipment to maintain the required operating pressure stably for a long period, preventing air infiltration that could cause safety risks and ensuring the purity of the process atmosphere.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the full cross-sectional structure of the fuselage of the present invention; Figure 3 This is a schematic diagram of the reverse engineering component structure of the present invention; Figure 4 This is a schematic diagram of the material discharge sealing structure of the present invention; Figure 5 For the present invention Figure 2 Enlarged structural diagram at point A in the diagram; Figure 6 For the present invention Figure 2 A schematic diagram of the full cross-section structure at points AA and BB.

[0020] Numbering on the map: 1. Machine body; 21. Heat exchanger tube; 22. External heat tracing tube; 23. Inlet and outlet water distributor; 24. Water distribution ring pipe; 25. Support structure; 251. Support pipe; 252. Support sleeve; 3. Feed box; 31. First exhaust gas outlet; 4. Discharge box; 41. Second exhaust gas outlet; 61. Sealing curtain; 62. Support ring; 63. Air seal hole ring; 64. Packing; 65. Stuffing box; 66. Pressure plate; 67. Partition plate; 68. Packing gland; 71. Positive inclined lifting plate; 72. Reverse inclined lifting plate; 8. Support reinforcing ring pipe. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Please refer to the appendix carefully. Figures 1-6 A rotary dryer for ultra-high molecular weight polyethylene includes a machine body 1 and a control system. The machine body 1 is driven by an external drive device, which typically includes a motor, a reducer and a pinion meshing with a large gear ring, and rotates continuously around its horizontal axis. The machine body 1 is mounted on multiple support systems and is inclined downward at a slight angle from the feed end to the discharge end, typically between 1° and 5°, to facilitate the material to move slowly towards the discharge end under its own weight and the action of the lifting plates.

[0024] The two ends of the machine body 1 are connected to the feed box 3 and the discharge box 4 through a sealing structure, respectively. The top of the feed box 3 is provided with a first exhaust gas outlet 31, and the top of the discharge box 4 is provided with a second exhaust gas outlet 41. Both outlets are connected to an exhaust device, such as an induced draft fan, forming a double exhaust structure. This design can improve the flow rate and distribution uniformity of the drying medium in the cylinder, improve the drying efficiency, and enable the machine body 1 to maintain a stable operating pressure of -25kPa to +4kPa.

[0025] In this embodiment, as Figure 1 and Figure 2As shown, the heating system abandons the traditional steam heating that is prone to overheating and adopts indirect hot water heating. The heating system includes an external heat tracing pipe 22 laid on the body 1 in a circular direction, and several heat exchange pipes 21 arranged evenly and parallel along the axis of the body 1. The external heat tracing pipe 22 and the heat exchange pipes 21 are evenly distributed on the body 1 to form a dense heat exchange network. The external heat tracing pipe 22 and the heat exchange pipes 21 are connected to a fixed inlet and outlet water distributor 23 through a water distribution ring pipe 24 set outside the body 1 to form a closed hot water circulation loop.

[0026] Specifically, the inlet and outlet water distributor 23 includes independent inlet and outlet water distributors, which are used to evenly distribute constant temperature hot water to each heat exchange pipe and to collect and discharge cooled water. The water distribution ring pipe 24 is provided with multiple connecting ports, which are sealed to the heat exchange pipe 21 and the external heat tracing pipe 22 through metal hoses or rotary joints. All water-contacting components, including the heat exchange pipe 21, the external heat tracing pipe 22, the inlet and outlet water distributor 23 and the water distribution ring pipe 24, are made of 304 stainless steel to ensure corrosion resistance and no pollution.

[0027] The hot water circulation system includes a PID temperature controller, temperature sensors placed in key sections of the cylinder (such as the feed section, middle section, and discharge section), and electric valves for regulating flow, ensuring that the working temperature inside the cylinder is stable within ±2℃ of the set value.

[0028] In this embodiment, as Figure 1 , Figure 5 and Figure 6 As shown, the support structure 25 includes a support pipe 251 welded to the wall of the fuselage 1, and a support sleeve 252 sleeved on the outer wall of the heat exchange tube 21. The support pipe 251 is cylindrical, and the support sleeve 252 is made of two semi-circular clamps. One of the semi-circular clamps is welded to the end of the support pipe 251. The two clamps are fastened by bolts to hold the heat exchange tube 21 tightly. The support structure 25 is evenly distributed in a ring along the axial direction inside the fuselage 1. In addition, multiple support reinforcing ring pipes 8 are evenly distributed along the axial direction inside the fuselage 1. The support reinforcing ring pipes 8 provide auxiliary support for the heat exchange tube 21 to prevent it from deflecting due to excessive length.

[0029] In this embodiment, as Figure 3As shown, the lifting plate assembly includes a forward-inclined lifting plate 71 and a reverse-inclined lifting plate 72 welded to the inner wall of the machine body 1. In the area near both ends of the machine body 1, only the forward-inclined lifting plate 71 is provided to ensure smooth material entry and exit. In the main drying area of ​​the machine body 1, the forward-inclined lifting plates 71 and the reverse-inclined lifting plates 72 are distributed alternately and evenly. The inclination direction of the forward-inclined lifting plate 71 (for example, inclined at 30°-60° towards the discharge end) allows it to push the lifted material towards the discharge end when the machine body 1 rotates. The inclination direction of the reverse-inclined lifting plate 72 is opposite to that of the forward-inclined lifting plate 71, which can impede the axial flow velocity of the material and prolong the residence time of the material in the drum. The surface of all lifting plates is a smooth structure without any depressions, thereby avoiding dead zones where material accumulates.

[0030] In this embodiment, as Figure 1 and Figure 4 As shown, the sealing structure is installed on the discharge box 4, and mainly includes: Stuffing box 65: Fixedly installed on the discharge box 4, serving as the main frame of the sealing structure.

[0031] Support ring 62: It is sleeved on the rotating shaft of the machine body 1 and located inside the stuffing box 65. Its material is ultra-high molecular weight polyethylene to avoid wear and contamination of materials.

[0032] Sealing curtain assembly: Located on the outside of the support ring 62, it includes a sealing curtain 61 made of ultra-high molecular weight polyethylene, and a metal pressure plate 66 and a partition 67 for clamping and fixing the sealing curtain 61. The inner side of the sealing curtain 61 maintains dynamic contact with the surface of the body 1 to form a contact seal.

[0033] Air seal ring 63: This ring is mounted on the machine body 1 and installed between the support ring 62 and the packing 64. The air seal ring 63 has a ring of tiny air holes and is made of 304 stainless steel. The air seal ring 63 connects to an external air source through an air inlet, allowing the introduction of inert gas to form a stable air curtain seal in the area between the sealing curtain 61 and the packing 64, preventing dust from escaping and external air from infiltrating.

[0034] The packing seal assembly includes a flexible packing 64, preferably made of polytetrafluoroethylene, filled inside the stuffing box 65, and a packing gland 68 for axially compressing the packing 64 from the outside. The packing gland 68 is connected to the stuffing box 65 by bolts, and the compression of the packing 64 can be adjusted by adjusting the tightness of the bolts to ensure a long-term effective seal.

[0035] The pressure plate 66, partition plate 67, packing gland 68 and stuffing box 65 are connected and fixed in sequence by long bolts to form an integral adjustable, multi-layer protective sealing module.

[0036] In this embodiment, as Figure 1As shown, the main structural components of the equipment, such as the cylinder wall of the machine body 1, the feed box 3, and the discharge box 4, are all made of 304 stainless steel, ensuring the cleanliness and corrosion resistance of the entire equipment when in contact with materials and the process environment.

[0037] The specific operation process of this invention is as follows: During operation, the drive device starts, driving the machine body 1 to rotate continuously around its horizontal axis. Hot water, pre-prepared and kept at a set temperature by an external heat source (such as a hot water boiler or electric heating device), is evenly distributed into the water distribution ring pipe 24 surrounding the machine body 1 through the inlet water distributor in the fixed inlet and outlet water distributor 23, and then split into the heat exchange pipe 21 and the external heat tracing pipe 22, forming a closed circulating heating loop. The hot water flows inside the pipe, providing stable and uniform indirect heating to the inside of the machine body 1 through the pipe wall. After releasing heat, the temperature decreases, and the hot water is collected through the outlet water distributor and returned to the external heat source for reheating, thereby continuously and controllably providing the heat required for drying.

[0038] The ultra-high molecular weight polyethylene wet material to be dried is continuously and quantitatively fed into the rotating machine body 1 from the feed box 3. Due to the slight inclination of the machine body 1 from the feed end to the discharge end of 1° to 5°, coupled with the action of the specially designed lifting plate assembly inside, the material undergoes complex movement inside the cylinder.

[0039] Specifically, in the main drying zone of the machine body 1, the inclined lifting plates 71 disperse the material during rotation, fully exposing it for efficient heat exchange, and the organic solvents in the material are vaporized. Simultaneously, the inclined design of the inclined lifting plates 71 provides the material with an axial force that propels it towards the discharge end, while the staggered, counter-inclined lifting plates 72, with their opposite inclined directions, impede the axial flow of the material, thereby extending the residence time of the material in the high-temperature drying zone and ensuring thorough drying. In the areas near both ends, the inclined lifting plates 71 primarily serve a conveying and guiding function, ensuring smooth material entry and exit. The smooth surface of all lifting plates ensures that the material is completely dispersed and renewed, with no residual material accumulation.

[0040] The drying medium required for the drying process (usually hot nitrogen or other inert gas) can be introduced from both ends. The water vapor evaporated from the material is carried by the drying medium to form exhaust gas. The exhaust gas is then drawn through the first exhaust gas outlet 31 on the feed box 3 and the second exhaust gas outlet 41 on the discharge box 4 using an external suction device. This dual suction structure can improve the uniformity and velocity of the airflow along the entire length of the cylinder, enhance the mass transfer process, improve the drying efficiency, and can be flexibly adjusted to maintain the set operating pressure inside the machine body 1 between -25 kPa and +4 kPa.

[0041] After drying, the qualified material is slowly moved to the discharge box 4 with the help of the lifting plates and the tilt of the cylinder, and the unloading is completed.

[0042] Throughout the process, the discharge sealing structure (and the same applies to the feed end) provides a crucial guarantee for the stable operation of the equipment under high vacuum. Its working principle is a multi-layer synergistic seal: First, the sealing curtain 61, made of ultra-high molecular weight polyethylene, is tightly fitted to the surface of the rotating shaft of the machine body 1, forming the first contact seal and blocking most of the dust. Second, the inert gas introduced into the gas sealing ring 63 forms a stable air curtain barrier through the tiny pores on it in the gap between the sealing curtain 61 and the flexible packing 64, further blocking the exchange of gas and fine powder. Finally, the polytetrafluoroethylene packing 64, which is moderately compressed by the packing gland 68, constitutes the third packing seal. These three seals work together to ensure the effective isolation of the process atmosphere inside the cylinder from the external environment, avoiding leakage and material contamination during operation.

[0043] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A rotary dryer for ultra-high molecular weight polyethylene, comprising a body (1), the body (1) being a cylindrical body rotatable about its axis, characterized in that, include: A drive device is connected to the body (1) to drive it to rotate. The body (1) is provided with multiple support systems that do not affect its rotation. The body (1) is tilted downward from left to right. The feed box (3) and the discharge box (4) are respectively set at both ends of the machine body (1) through a sealing structure; The heating system is located inside the machine body (1) and is used to indirectly heat the material; The heating system includes an external heat tracing pipe (22) laid on the body (1) and a heat exchange pipe (21) located inside the body (1) and extending along its axial direction. The heat exchange pipe (21) and the external heat tracing pipe (22) are evenly distributed on the body (1), and the external heat tracing pipe (22) and / or the heat exchange pipe (21) are connected to the inlet and outlet water distributor (23) through a water distribution ring pipe (24) located outside the body (1) to form a closed hot water circulation loop. The machine body (1) is equipped with a lifting plate assembly, which is used to push the material to the discharge end when the machine body (1) rotates, and at the same time can prevent the material from flowing to the discharge end too quickly.

2. The rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The heating system also includes a support structure (25), which includes a support tube (251) and a support sleeve (252). One end of the support sleeve (252) is connected to the cylinder wall of the machine body (1), and the other end is connected to the support sleeve (252). The support sleeve (252) is fitted onto the outer wall of the heat exchange tube (21), and the support sleeve (252) is made of two semi-circular clamps spliced ​​together. One of the semi-circular clamps is connected to the support tube (251). The support structure (25) is used to support and position the heat exchange tube (21).

3. A rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The body (1) is provided with uniformly spaced and equidistantly distributed support and reinforcing ring pipes (8) for auxiliary support of several annularly distributed heat exchange tubes (21).

4. A rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The scraper assembly includes a forward-sloping scraper (71) and a reverse-sloping scraper (72) connected to the inner wall of the body (1). Only the forward-sloping scraper (71) is provided near both ends of the body (1), while the other areas are provided with the forward-sloping scraper (71) and the reverse-sloping scraper (72) in an alternating manner. The inclined lifting plate (71) and the reverse inclined lifting plate (72) are evenly distributed along the axial direction of the machine body (1). The inclined direction of the inclined lifting plate (71) is adapted to drive the material to push towards the discharge end when the machine body (1) rotates. The inclined direction of the reverse inclined lifting plate (72) is designed to block the material from flowing towards the discharge end.

5. A rotary dryer for ultra-high molecular weight polyethylene according to claim 4, characterized in that: The surfaces of the oblique plate (71) and the reverse oblique plate (72) are both smooth and without any recessed areas.

6. A rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The system also includes a feeding sealing structure and a discharging sealing structure. The feeding sealing structure is located at the connection between the feeding box (3) and the machine body (1), and the discharging sealing structure is located at the connection between the discharging box (4) and the machine body (1). The feeding sealing structure and the discharging sealing structure are consistent.

7. A rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The discharge sealing structure includes a stuffing box (65), a support ring (62), an air seal ring (63), a sealing curtain assembly, a packing (64), and a packing gland (68) installed in the discharge box (4). The support ring (62) is sleeved on the body (1) and located inside the stuffing box (65), and is made of ultra-high molecular weight polyethylene material; The sealing curtain assembly includes a sealing curtain (61) made of ultra-high molecular weight polyethylene, and a pressure plate (66) and a partition plate (67) for clamping and fixing the sealing curtain (61). The inner side of the sealing curtain (61) is in dynamic contact with the rotating surface of the body (1). The air seal ring (63) is disposed on the body (1) and located between the support ring (62) and the packing (64). The air seal ring (63) has a plurality of air holes facing the surface of the body (1). The packing (64) is filled inside the stuffing box (65) and located on one side of the air seal ring (63). The packing gland (68) is used to axially press the packing (64). The pressure plate (66), partition plate (67), packing gland (68) and stuffing box (65) are connected in sequence by fasteners.

8. A rotary dryer for ultra-high molecular weight polyethylene according to claim 7, characterized in that: The air seal ring (63) is provided with an air inlet for connecting an external air source and introducing inert gas to form an air curtain seal in the area between the sealing curtain (61) and the packing (64).

9. A rotary dryer for ultra-high molecular weight polyethylene according to claim 1, characterized in that: The feed box (3) is provided with a first exhaust gas outlet (31), and the discharge box (4) is provided with a second exhaust gas outlet (41). Both the first exhaust gas outlet (31) and the second exhaust gas outlet (41) are provided with a suction device. The suction device is used to extract the exhaust gas inside the machine body (1) to form a double suction structure.

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