Modified nylon top roller for tobacco primary belt conveyor and process for making same

Abstract

This invention belongs to the technical field of tobacco processing equipment, and provides a modified nylon idler roller for a tobacco processing belt conveyor and its manufacturing process. The idler roller includes a roller shaft, a three-section roller, a positioning sleeve, and a sealing end cap. The three-section roller is integrally formed from modified nylon material, and has an axially extending sleeve groove inside, with friction texture on its outer circumference. The positioning sleeve is embedded in the sleeve groove, and its outer ring has a guide rail that cooperates with the sleeve groove. The three-section roller and the positioning sleeve are axially limited by a snap-fit ​​structure. A brass sleeve is fixed to the inner ring of the positioning sleeve, and the brass sleeve has a bearing housing cavity that rotatably cooperates with the reduced diameter shaft section. The outer wall of the brass sleeve slides in contact with the inner wall of the sleeve groove. The sealing end cap is fixedly connected to the end of the three-section roller and together with the roller shaft and the positioning sleeve, forms a closed chamber. This invention enables oil-free, low-resistance, and sealed rotation, and is suitable for the harsh working conditions of tobacco processing workshops.

Description

Technical Field

[0001] This application relates to the field of tobacco processing equipment technology, and in particular to modified nylon idlers for tobacco processing belt conveyors and their manufacturing process. Background Technology

[0002] In tobacco processing workshops, belt conveyors are typically equipped with metal idlers. However, these workshops require maintaining specific temperatures and humidity levels, and the concentration of tobacco dust is high. Metal idlers present several technical drawbacks.

[0003] (1) The ball bearings at both ends are in a humid and hot + dusty environment for a long time, which makes them prone to scaling and corrosion, directly causing the roller to jam and become unable to rotate;

[0004] (2) Roller jamming causes dry friction and slippage between the conveyor belt and the idler surface, which aggravates idler wear and conveyor belt loss, resulting in frequent idler failure;

[0005] (3) After the bearing is corroded, it is difficult to disassemble and repair. It can only be scrapped and replaced as a whole, which results in serious waste of resources and high equipment maintenance costs.

[0006] (4) The rollers are not flexible in rotation and have high running resistance, which makes the material conveying process unstable and reduces the production efficiency of the tobacco shredding production line.

[0007] To address the aforementioned issues, existing technological improvements are limited to enhancing bearing sealing performance or changing bearing materials, failing to fundamentally solve the core problems of metal idlers being prone to corrosion, heavy, and difficult to maintain, thus unable to meet the actual needs of long-term stable operation of equipment in tobacco processing workshops. Furthermore, if ordinary nylon is directly used to make the idler body, the nylon material is hygroscopic and easily absorbs water and expands in the humid and hot environment of the workshop, causing changes in the clearance between it and mating components, affecting the idler's rotational flexibility. Therefore, targeted modification treatment of the nylon material is necessary.

[0008] For example, patent CN2825539Y discloses a flame-retardant and antistatic nylon idler roller, including a roller body, bearing housing, bearing, main shaft, and end caps. The bearing housing is located at both ends of the roller body, and the bearing is located inside the bearing housing. The roller body is fixed to the main shaft by the bearing. The roller body is an integral nylon roller body. A polyurethane elastomer sealing ring with a double-lip structure is set on the main shaft outside the bearing, and grease is placed between the two lips of the sealing ring. This solution, due to the use of an integral nylon roller body, has the advantages of light weight, flame retardancy, antistatic properties, and good wear resistance. In terms of sealing, the use of a polyurethane elastomer sealing ring with a double-lip structure with excellent sealing performance can effectively protect the bearing and prevent the intrusion of moisture and dust, further improving the wear resistance and sealing performance of the sealing ring. It is waterproof and dustproof, suitable for belt conveyors of different speeds underground. It is particularly suitable for use in heavy-duty high-speed belt conveyors underground. However, this solution still uses the classic metal rotating structure of bearing housing + rolling bearing + main shaft. In the high-dust, high-humidity environment of a tobacco workshop, even with double-lip polyurethane seals and grease, dust particles can still gradually seep into the bearing or cause grease emulsification and failure, ultimately leading to bearing corrosion or scaling. Once a bearing fails, it still requires complete replacement or destructive repair, which does not meet the requirements of tobacco processing workshops for "maintenance-free, easy replacement, and long service life." Furthermore, although this solution uses nylon as the roller body material, it does not undergo any modification treatment or structural compensation design to address its hygroscopicity. In the long-term high-temperature, high-humidity environment of a tobacco processing workshop, nylon material may still slowly absorb water, causing slight expansion of the roller's inner diameter. This alters the clearance between the roller and the bearing housing or main shaft, leading to increased rotational resistance or even jamming, affecting the roller's rotational flexibility.

[0009] Therefore, a new type of nylon idler roller for belt conveyors is needed to address the various defects of traditional metal idlers under these conditions and improve the operational stability of the conveying equipment. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a modified nylon idler roller for a tobacco processing belt conveyor and its manufacturing process. This invention can completely solve the problems of bearing corrosion, roller jamming, and friction slippage of metal idlers in humid, hot, and dusty environments, while also solving the problem of ordinary nylon swelling due to water absorption affecting rotation. It achieves oil-free, low-resistance, and sealed rotation, making it suitable for the harsh working conditions of tobacco processing workshops.

[0011] To achieve the above and related objectives, the present invention employs the following technical means:

[0012] The first aspect of the present invention provides a modified nylon idler for a tobacco shredding belt conveyor, comprising a roller shaft, a three-section roller, a positioning sleeve, and a sealing end cap;

[0013] The roller shaft has reduced diameter sections at both ends;

[0014] The three-section roller is integrally molded from modified nylon material. It has an axially extending sliding groove inside and a friction texture on the outer circumference of the three-section roller.

[0015] The positioning sleeve is embedded in the sliding groove of the sleeve, and its outer ring is provided with a slide rail that guides and cooperates with the sliding groove of the sleeve. The three-section roller and the positioning sleeve are axially limited by a snap-fit ​​structure.

[0016] The inner ring of the positioning sleeve is fixed with a brass sleeve. The brass sleeve has a bearing housing cavity that rotates with the reduced diameter shaft section, and the outer wall of the brass sleeve slides in contact with the inner wall of the sleeve groove.

[0017] The sealing end cap is fixedly connected to the end of the three-section roller and together with the roller shaft and positioning sleeve, forms a closed chamber.

[0018] Furthermore, the snap-fit ​​structure includes: a snap ring groove provided on the inner wall of the sliding sleeve groove, and a snap ring provided on the outer ring of the positioning sliding sleeve and cooperating with the snap ring groove.

[0019] Furthermore, the positioning sleeve is also provided with a push hole for disassembly and assembly under load.

[0020] Furthermore, the friction texture is a knurled structure.

[0021] Furthermore, the modified nylon material contains glass fiber reinforcement, polytetrafluoroethylene lubricant, and anti-water-absorbing modifier.

[0022] Furthermore, the sealing end cap includes a sealing gland and a sealing pad, the sealing gland being made of modified nylon material and the sealing pad being made of wool material.

[0023] A second aspect of the present invention provides a process for preparing modified nylon idlers for a tobacco shredding belt conveyor, comprising the following steps:

[0024] S1. A modified nylon material is prepared by mixing a nylon substrate with a glass fiber reinforcing agent, a polytetrafluoroethylene lubricant and an anti-water-absorbing modifier, and then granulating the mixture by melt extrusion.

[0025] S2. A three-section roller is injection molded from modified nylon material, forming a sliding sleeve groove inside, a friction texture on the outer periphery, and an end cap mounting structure at the end.

[0026] S3. The positioning slide sleeve is injection molded using modified nylon material. A brass slide sleeve is fixed in the inner ring of the positioning slide sleeve. The positioning slide sleeve is inserted into the slide sleeve groove and forms an axial locking and limiting connection with the three-section roller.

[0027] S4. Prepare a sealing end cap, fix the sealing end cap to the end cap mounting structure of the three-section roller, and form a closed chamber together with the roller shaft and positioning sleeve to complete the assembly of the modified nylon idler roller.

[0028] Furthermore, the rollers are made of steel that has been tempered and then precision machined.

[0029] Furthermore, the positioning sleeve is machined with a push hole. During assembly, force is applied to the positioning sleeve through the push hole, causing the positioning sleeve to slide to the limit position in the sleeve groove and be locked in place.

[0030] Furthermore, the three-section roller and the sealing end cap are machined with connecting holes for screw fixing assembly.

[0031] The beneficial technical effects of this invention are as follows:

[0032] This invention avoids metal corrosion at its source by combining modified nylon material with brass sliding sleeve. At the same time, the modified nylon material can solve the problem of water absorption and expansion, ensuring stable fitting clearance, flexible and reliable roller rotation, and achieving the purpose of rust prevention, jamming prevention, and dimensional stability.

[0033] The friction texture on the surface of the three-section roller of this invention can increase the friction with the conveyor belt, effectively preventing slippage. The combination of the self-lubricating material of the modified nylon can reduce friction loss and extend the service life of the idler roller and the conveyor belt, achieving the purpose of anti-slip and low wear.

[0034] The positioning sleeve of this invention can be disassembled as a whole by being pushed out through the push hole, and the internal components can be replaced individually without the need for complete scrapping. This can significantly reduce equipment maintenance time and costs, achieving the goal of convenient maintenance and cost reduction.

[0035] The idler roller of this invention has low rotational resistance, which can reduce the energy consumption of equipment operation. It also has good overall sealing performance and stable rotation, which can effectively improve the overall conveying efficiency and production stability of the tobacco processing production line, thereby achieving the purpose of energy saving, efficiency improvement and stable operation.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0037] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. In the drawings:

[0038] Figure 1This is a schematic diagram of the assembly structure of the modified nylon idler roller of this application;

[0039] Figure 2 This is a schematic diagram of the explosive decomposition of a section of the modified nylon idler roller of this application;

[0040] Figure 3 This is a schematic diagram of the roller structure of this application;

[0041] Figure 4 This is a schematic diagram of the three-section roller structure of this application;

[0042] Figure 5 for Figure 4 Partial cross-sectional view of one end of a three-section roller;

[0043] Figure 6 This is a schematic diagram of the positioning sliding sleeve structure of this application;

[0044] Figure 7 This is a sectional view of the positioning sleeve in this application;

[0045] Figure 8 This is a schematic diagram of the internal components of the positioning sleeve in this application;

[0046] Figure 9 This is a schematic diagram of the sealing gland and sealing gasket structure of this application.

[0047] Figure Labels

[0048] 1: Screw; 2: Sealing cap; 3: Sealing gasket; 4: Snap ring; 5: Surface bearing; 6: Brass sleeve; 7: Positioning sleeve; 8: Roller shaft; 81: Reduced diameter shaft section; 82: Lead screw; 9: Three-section roller; 91: Sleeve groove; 92: First connecting hole; 93: Snap ring groove; 94: Slide rail; 71: Slide rail; 72: First positioning groove; 73: Push hole; 74: Second positioning groove; 21: Third positioning groove. Detailed Implementation

[0049] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of the invention (described in the context of separate embodiments for clarity) may also be provided in a single embodiment. Conversely, multiple features of the invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of the invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of the invention are merely illustrative and should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be covered within the scope of protection of the invention.

[0050] like Figures 1 to 4 As shown, this application provides a modified nylon idler roller for a tobacco shredding belt conveyor, including a roller shaft 8, a three-section roller 9, a positioning sleeve 7, and a sealing end cap; the roller shaft 8 has a reduced diameter shaft section 81 at both ends; the three-section roller 9 is integrally formed from modified nylon material, and has a sleeve groove 91 extending axially inside, and the outer circumferential surface of the three-section roller 9 has friction texture; the positioning sleeve 7 is embedded in the sleeve groove 91, and its outer ring has a slide rail 71 that guides and cooperates with the sleeve groove 91; the three-section roller 9 and the positioning sleeve 7 are axially limited by a snap-fit ​​structure; a brass sleeve 6 is fixed to the inner ring of the positioning sleeve 7, and the brass sleeve 6 has a bearing receiving cavity that rotatably cooperates with the reduced diameter shaft section 81, and the outer wall of the brass sleeve 6 slides in contact with the inner wall of the sleeve groove 91; the sealing end cap is fixedly connected to the end of the three-section roller 9, and together with the roller shaft 8 and the positioning sleeve 7, forms a closed chamber.

[0051] Furthermore, such as Figure 3 As shown, the diameter of the reduced-diameter shaft sections 81 at both ends of the roller shaft 8 in this application is smaller than that of the shaft body, forming dedicated mounting positions for the flat bearing 5 and the brass sleeve 6, effectively limiting the axial movement of the flat bearing 5 and the brass sleeve 6. Furthermore, the shaft head of the reduced-diameter shaft section 81 is set as a lead screw 82, with a matching nut for axial tightening, ensuring assembly stability. Figure 2 and Figure 8 As shown, the planar bearing 5 of this application cooperates with the nut to axially constrain the brass sleeve 6 in a set position, preventing it from axially reciprocating, thereby ensuring clearance and rotational stability. In addition, the planar bearing 5 can achieve relative rotation with a small amount of friction while bearing axial load, achieving rotational flexibility and reducing local wear.

[0052] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the three-section roller 9 of this application is integrally molded from modified nylon material. The three-section structure further reduces the overall weight of the idler roller, lowers the moment of inertia, improves rotational flexibility, and reduces equipment operating resistance and energy consumption. Furthermore, the friction texture of the three-section roller 9 is a knurled structure, which increases the friction with the conveyor belt and prevents slippage.

[0053] Furthermore, addressing the issues of ordinary nylon's high water absorption and tendency to expand in humid and hot environments, leading to changes in the mating clearance, this application modifies the nylon material used in the idler roller body. The modified nylon material of this application is formulated with PA66 as the base resin, adding 8%~12% glass fiber reinforcing agent, 3%~5% polytetrafluoroethylene (PTFE) lubricant, 2%~4% anti-water absorption modifier, and 1%~2% antioxidant by mass fraction. The mixture is then melt-extruded and granulated to obtain the modified nylon material of this application. This modified nylon material can reduce water absorption, improve dimensional stability, prevent expansion in humid and hot environments from affecting the mating accuracy with the brass sleeve 6, and ensure the idler roller's rotational flexibility. The water-absorbing modifier in this application can be selected from maleic anhydride-grafted polyolefins, organosilicon modifiers, etc.; the antioxidant can be selected from antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]), antioxidant 1076, antioxidant 168 (tris[2,4-di-tert-butylphenyl]phosphite), antioxidant 626, etc.

[0054] Furthermore, such as Figure 4 and Figure 5 As shown, the three-section roller 9 of this application has four first connecting holes 92 at both ends for subsequent fixing of sealing end caps. The interior of the three-section roller 9 has an axially oriented sliding sleeve groove 91, which is used to radially guide the internal positioning sliding sleeve 7, and its interior has a slide rail 94 for the slide rail 71 to slide on. Figure 6 and Figure 7 As shown, the positioning sleeve 7 of this application is externally provided with a slide rail 71, which is precisely fitted and assembled with the slide channel 94. A first positioning groove 72 and a second positioning groove 74 are formed inside the positioning sleeve 7. The second positioning groove 74 is used for axial positioning of the plane bearing 5, and the first positioning groove 72 is used for positioning of the retaining spring 4. Within the area defined by the first positioning groove 72 and the second positioning groove 74, an annular mounting cavity is formed on the inner ring of the positioning sleeve 7, and a brass sleeve 6 is fixedly installed in this mounting cavity. Because the brass sleeve 6 does not rust and rotates smoothly, when it is assembled on the inner ring of the positioning sleeve 7, it can form a good low-resistance rotation interface with the inner wall of the sleeve groove 91 made of modified nylon material, thereby achieving smooth rotation of the entire idler roller.

[0055] Furthermore, Figure 5 and Figure 8 As shown. The snap-fit ​​structure of this application includes: a snap ring groove 93 disposed on the inner wall of the sliding sleeve groove 91, and a snap ring 4 disposed on the outer ring of the positioning sliding sleeve 7 and cooperating with the snap ring groove 93. Through the cooperation between the snap ring 4 and the snap ring groove 93, this application can effectively limit the movement of the positioning sliding sleeve 7 in the axial direction.

[0056] Furthermore, such as Figure 6 and Figure 7 As shown, the positioning sleeve 7 of this application is also provided with a push hole 73 for disassembly and assembly. With the push hole 73, the positioning sleeve 7 can be pushed out as a whole during maintenance by using a long screw 1, which facilitates disassembly and component replacement.

[0057] Furthermore, such as Figure 9 As shown, the sealing end cap of this application includes a sealing gland 2 and a sealing pad 3. The sealing gland 2 is made of modified nylon material, and the sealing pad 3 is made of wool material. The sealing gland 2 has a third positioning groove 21, through which the sealing pad 3 is mounted on the sealing gland 2. This application uses screws 1 to fix the sealing end cap to the end of the three-section roller 9, forming a closed chamber together with the roller shaft 8 and the positioning sleeve 7, thus creating a multi-level dustproof and moisture-proof sealing structure, effectively preventing moisture and tobacco dust in the workshop from entering the rotating part of the idler roller.

[0058] Furthermore, the working principle of the modified nylon idler roller of this application is as follows:

[0059] This application's modified nylon idler employs a working mode where the roller shaft 8 is fixed and the three-section roller 9 rotates freely. After assembly, the roller shaft 8 remains stationary, serving only as overall support and component positioning. During conveyor belt operation, friction drives the three-section roller 9 to rotate. The three-section roller 9 rotates relative to the roller shaft 8 via positioning sleeves 7 at both ends, internal planar bearings 5, and brass sleeves 6. At this time, because the roller, made of modified nylon material, possesses excellent self-lubricating properties, wear resistance, and dimensional stability, it, in conjunction with the brass sleeves 6, achieves oil-free, low-resistance, and flexible rotation. Furthermore, the multiple sealing structures formed by the sealing cap 2 and the sealing gasket 3 effectively prevent workshop moisture and dust from entering the rotating pair, fundamentally avoiding bearing corrosion and jamming. In addition, the knurled structure on the surface of the three-section roller 9 reduces weight while ensuring sufficient friction between the roller and the belt, preventing slippage and achieving long-term stable and reliable operation of the modified nylon idler.

[0060] The present invention also provides a process for preparing modified nylon idlers for tobacco shredding belt conveyors, comprising the following steps:

[0061] S1. A modified nylon material is prepared by mixing a nylon substrate with a glass fiber reinforcing agent, a polytetrafluoroethylene lubricant and an anti-water-absorbing modifier, and then granulating the mixture by melt extrusion.

[0062] S2. A three-section roller is injection molded from modified nylon material, forming a sliding sleeve groove inside, a friction texture on the outer periphery, and an end cap mounting structure at the end.

[0063] S3. The positioning slide sleeve is injection molded using modified nylon material. A brass slide sleeve is fixed in the inner ring of the positioning slide sleeve. The positioning slide sleeve is inserted into the slide sleeve groove and forms an axial locking and limiting connection with the three-section roller.

[0064] S4. Prepare a sealing end cap, fix the sealing end cap to the end cap mounting structure of the three-section roller, and form a closed chamber together with the roller shaft and positioning sleeve to complete the assembly of the modified nylon idler roller.

[0065] Furthermore, in S1 of this application, PA66 is weighed as the base resin according to the formula, and glass fiber reinforcing agent of 8%~12% by mass, polytetrafluoroethylene (PTFE) lubricant of 3%~5%, water-absorbing modifier of 2%~4% and antioxidant of 1%~2% are added. After being mixed evenly in a high-speed mixer, the mixture is granulated by a twin-screw extruder to prepare modified nylon granules, and after drying, modified nylon material is obtained.

[0066] Furthermore, the roller shaft 8 of this application is made of 45 steel as raw material, and is formed by blanking and turning. Both ends are machined into reduced diameter shaft sections 81, and the shaft head is machined into a lead screw 82. Subsequently, it is heat treated and rust-proofed.

[0067] Furthermore, in S2 of this application, modified nylon material is added to an injection molding machine, and a three-section roller 9 blank is injection molded using a special mold. After cooling and demolding, the sliding sleeve groove 91, the slide 94, the first connecting hole 92 and the snap ring groove 93 are machined by a CNC lathe. Finally, the surface of the three-section roller 9 is knurled.

[0068] Furthermore, in S3 of this application, modified nylon material is added to an injection molding machine, and a positioning slide sleeve 7 is injection molded using a special mold. An external slide rail 71, an internal first positioning groove 72, and a second positioning groove 74 are machined. The positioning slide sleeve 7 is also machined with a push hole 73. During assembly, force is applied to the positioning slide sleeve 7 through the push hole 73, causing the positioning slide sleeve 7 to slide to the limit position within the slide sleeve groove 91 and be locked in place.

[0069] Furthermore, the brass bar material of this application is machined into a brass sliding sleeve 6, which is then assembled with the plane bearing 5 and the snap ring 4 into the positioning sliding sleeve 7 to form a complete assembly.

[0070] Furthermore, in S4 of this application, a sealing cap 2 is injection molded from modified nylon material, a third positioning groove 21 and a second connecting hole are processed, and a sealing pad 3 is made by cutting and pressing wool material and embedded in the third positioning groove 21 to form a sealing end cap.

[0071] Furthermore, in this application, the positioning sleeve 7 is assembled to the mounting positions at both ends of the roller shaft 8 and limited by the snap ring 4; the three-section roller 9 is fitted into the roller shaft 8 so that the sliding groove 91 of the sleeve and the positioning sleeve 7 are precisely matched; sealing end caps are installed at both ends of the three-section roller 9 and fastened by screws 1, thus completing the assembly of the whole modified nylon idler roller.

[0072] Furthermore, this application conducts radial runout, rotational flexibility, and sealing performance tests on the assembled modified nylon idler rollers, and puts them into storage after they pass the tests.

[0073] Furthermore, the manufacturing process of this application, through distributed injection molding and machining, can improve injection molding efficiency and dimensional accuracy, ensure the reliability of assembly fit, and the modular assembly process is suitable for mass production.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A modified nylon idler roller for a tobacco processing belt conveyor, characterized in that, It includes a roller shaft (8), a three-section roller (9), a positioning sleeve (7), and a sealing end cap; The roller (8) has reduced diameter shaft sections (81) at both ends. The three-section roller (9) is integrally formed from modified nylon material, and has an axially extending sliding groove (91) inside. The outer circumferential surface of the three-section roller (9) is provided with friction texture. The positioning sleeve (7) is embedded in the sleeve groove (91), and its outer ring is provided with a slide rail (71) that guides and cooperates with the sleeve groove (91). The three-section roller (9) and the positioning sleeve (7) are axially limited by a snap-fit ​​structure. The inner ring of the positioning sleeve (7) is fixed with a brass sleeve (6), and the brass sleeve (6) is provided with a bearing housing cavity that rotates with the reduced diameter shaft section (81), and the outer wall of the brass sleeve (6) slides in contact with the inner wall of the sleeve groove (91). The sealing end cap is fixedly connected to the end of the three-section roller (9) and together with the roller shaft (8) and the positioning sleeve (7) form a closed chamber.

2. The modified nylon idler roller according to claim 1, characterized in that, The snap-fit ​​structure includes: a snap ring groove (93) provided on the inner wall of the sliding sleeve groove (91), and a snap ring (4) provided on the outer ring of the positioning sliding sleeve (7) and cooperating with the snap ring groove (93).

3. The modified nylon idler roller according to claim 1, characterized in that, The positioning sleeve (7) is also provided with a push hole (73) for disassembling and assembling the force.

4. The modified nylon idler roller according to claim 1, characterized in that, The friction texture is a knurled structure.

5. The modified nylon idler roller according to claim 1, characterized in that, The modified nylon material contains glass fiber reinforcement, polytetrafluoroethylene lubricant, and anti-water-absorbing modifier.

6. The modified nylon idler roller according to claim 1, characterized in that, The sealing end cap includes a sealing cap (2) and a sealing pad (3), wherein the sealing cap (2) is made of the modified nylon material and the sealing pad (3) is made of wool material.

7. A process for preparing modified nylon idlers for tobacco processing belt conveyors, characterized in that, Includes the following steps: S1. A modified nylon material is prepared by mixing a nylon substrate with a glass fiber reinforcing agent, a polytetrafluoroethylene lubricant and an anti-water-absorbing modifier, and then granulating the mixture by melt extrusion. S2. A three-section roller is injection molded using the modified nylon material, forming a sliding sleeve groove inside, a friction texture on the outer periphery, and an end cap mounting structure at the end. S3. The positioning slide sleeve is injection molded using the modified nylon material, a brass slide sleeve is fixed in the inner ring of the positioning slide sleeve, and the positioning slide sleeve is inserted into the slide sleeve groove and forms an axial locking and limiting connection with the three-section roller; S4. Prepare a sealing end cap, fix the sealing end cap to the end cap mounting structure of the three-section roller, and form a closed chamber together with the roller shaft and the positioning sleeve to complete the assembly of the modified nylon idler roller.

8. The preparation process according to claim 7, characterized in that, The roller is made of steel that has been tempered and then precision machined.

9. The preparation process according to claim 7, characterized in that, The positioning sleeve is machined with a push hole. During assembly, force is applied to the positioning sleeve through the push hole, so that the positioning sleeve slides to the limit position in the sleeve groove and is locked in place.

10. The preparation process according to claim 7, characterized in that, The three-section roller and the sealing end cap are machined with connecting holes for screw fixing assembly.

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