Assembling method of taper-variable self-deviation-adjusting carrier roller

Abstract

The invention discloses an assembling method of a taper-variable self-deviation-adjusting carrier roller. The assembling method comprises the following steps: cleaning a part to be assembled; the adjusting elastic piece is sleeved in a specified position of the inner cylinder body; the two bearing seats are installed and welded to the two ends of the inner barrel correspondingly, and the ends of the elastic pieces are welded to the ends of the bearing seats in a welding mode; filling gaps of the to-be-assembled parts with mining lithium-based lubricating grease; the labyrinth inner seal, the labyrinth outer seal and the cover cap are assembled into a sealing ring assembly according to drawing requirements; a center shaft is installed, and a sealing ring, a bearing, a check ring, a sealing ring assembly and a protective cover are sequentially pressed into bearing seats at the two ends of the center shaft in a press-fitting mode; the roller ring plates, the supporting rods and the elastic pieces are hinged and assembled; the assembled self-deviation-adjusting carrier roller is detected, and it is ensured that the self-deviation-adjusting carrier roller meets the use requirement. By adopting a reasonable assembling mode, the assembling precision, the sealing performance, the lubricating effect and the overall performance of the assembled self-deviation-adjusting carrier roller can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of belt conveyors, and in particular to an assembly method of a self-adjusting idler with a variable taper. Background Art

[0002] At present, the mechanical automatic deviation adjustment structures of belt conveyors include forward tilting rollers, conical deviation adjustment rollers, spiral rollers, etc., all of which achieve deviation adjustment by applying reverse friction to the belt. Among them, the conical deviation adjustment roller is a key component used in belt conveyors to automatically correct the deviation of the conveyor belt. Figure 1 As shown in the figure, the diameter of one end of the structure is larger, and the diameter of the other end is smaller, and the taper of both ends is fixed. Since the tapered deflection adjustment roller body is tapered, the linear speed of different positions when the roller rotates is different (the linear speed is higher at the larger diameter). When the conveyor belt deviates to the large end of the tapered roller, the linear speed of the contact point on this side is greater than the speed of the conveyor belt, generating reverse friction and pushing the conveyor belt to the center; conversely, when it deviates to the small end, it generates positive correction force. The correction effect of the tapered deflection adjustment roller is affected by factors such as load, speed and taper size, and needs to be reasonably designed according to the working conditions. However, the actual working conditions such as belt speed, transportation volume, material characteristics, etc. are all changing. It is difficult for the existing fixed-taper roller body to reasonably match the working conditions and achieve good results.

[0003] Based on the above problems, the application of variable taper self-adjusting rollers was born, but the problems of assembly accuracy, sealing performance, lubrication effect, overall performance, etc. of the variable taper self-adjusting rollers after assembly have not been effectively solved. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned technology, it is necessary to provide an assembly method of a self-adjusting idler with variable taper.

[0005] A method for assembling a tapered self-adjusting roller comprises the following steps: Step S1: remove iron filings, dust and other debris on the parts to be assembled; Step S2: adjusting the elastic member to fit into the designated position of the inner cylinder, and fixing the position of the elastic member by winding with a high temperature resistant tape; Step S3: fix the inner cylinder on the welding fixture, adjust the coaxiality of the bearing seats at both ends of the inner cylinder and the inner cylinder, weld the two bearing seats to the two ends of the inner cylinder respectively by welding, and use a three-coordinate measuring instrument to detect the coaxiality of the bearing seat and the inner cylinder to ensure that it meets the requirements; weld the end of the elastic member to the end of the bearing seat by welding; Step S4: Use a high-pressure grease gun to fill the bearing gap with mining lithium-based grease, and at the same time fill 2 / 3 of the gaps between the labyrinth inner seal, the labyrinth outer seal, the protective cover, and the cover with mining lithium-based grease; Step S5: Assemble the inner seal of the labyrinth, the outer seal of the labyrinth, and the cover according to the requirements of the drawing to form a sealing ring assembly; Step S6: insert one end of the central shaft into the inner cylinder along one of the bearing seats, so that the central shaft is at a specified position, and press the sealing ring, bearing, retaining ring, sealing ring assembly, and protective cover into the bearing seats at both ends of the central shaft in sequence by press-fitting; Step S7: Connect the roller plate to one end of the support rod through a pin and a split pin, and then connect the other end of the support rod to the end of the elastic member through a pin and a split pin, and finally connect the tail of the roller plate to the bearing seat through a pin and a split pin. After the assembly is completed, ensure that the coaxiality of the roller body meets the requirements; Step S8: Inspect and test the assembled self-aligning roller to ensure that it meets the use requirements.

[0006] Preferably, in step S3, CO2 gas shielded welding is used to weld the bearing seat, and the welding parameters are: set current 130A, voltage 22V, welding speed 300mm / min; weld requirements: continuous welding, weld height 3mm, no undercut and pores; remove the tape, and use argon arc welding to spot weld 3 places between the end of the elastic part and the bearing seat, with a weld point diameter ≤2mm and a spacing of 30mm.

[0007] Preferably, in step S4, when filling the mining lithium-based grease, the lithium-based grease is placed in a constant temperature box, heated to 40±2°C, and stirred until there are no lumps. The high-pressure grease gun is evacuated of air before use, and the grease injection amount is calibrated to an error of ≤±1%.

[0008] Preferably, in step S6, when press-fitting the bearing, pay attention to the direction of the open end of the nylon retainer of the bearing facing outward, adjust the appropriate pressure, ensure that all parts must be pressed into place and must not be deformed by pressure; when press-fitting the parts, adjust the length of the plug in the pressure head, and ensure that the two grooves on the center axis are in the correct position in the roller so that the retaining ring can be installed correctly.

[0009] Preferably, when the bearing is press-fitted, the outer ring of the bearing is coated with a low-temperature refrigerant, the outer diameter is reduced by 0.03 mm, and the bearing is quickly pressed into the bearing seat with the opening of the retainer facing outward.

[0010] Preferably, in step S7, when installing the roller plate, the axial clearance between the roller plate and the bearing seat is detected with a feeler gauge, and the end face of the support rod is ground if the clearance exceeds the tolerance.

[0011] Preferably, in step S8, the self-aligning roller is tested including static testing and dynamic testing; Static inspection: measure the entire length of the shaft with a micrometer; Dynamic test: Run at 500 rpm for 2 hours on the test bench under no-load conditions, and use an infrared thermal imager to monitor the bearing temperature rise to ≤35°C; apply a radial load of 5kN under load conditions, and use a vibration analyzer to detect the vibration speed to ≤4.5mm / s, with no abnormal peaks in the spectrum.

[0012] Preferably, the self-adjusting eccentric roller includes an inner cylinder, a roller body, a center axis, an elastic member, and a support rod; the center axis is coaxially built into the inner cylinder, and the two ends of the center axis are rotatably adapted to the inner cylinder; the roller body includes a plurality of roller ring plates evenly spaced along the circumference of the inner cylinder, the upper end of each roller ring plate is a free end, and the lower end is hinged to the lower end of the inner cylinder; the number of the support rods is consistent with the number of the roller ring plates, and the lower end of each support rod is correspondingly hinged to the inner wall of the roller ring plate; the upper end of the elastic member is connected to the upper end of the inner cylinder, and the lower end of the elastic member is correspondingly hinged to the upper end of the support rod.

[0013] Preferably, the two ends of the inner cylinder are provided with bearing seats rotatably connected to the two ends of the central axis, the bearing seat located at the lower end of the inner cylinder is hinged to the lower end of the roller plate, and the bearing seat located at the upper end of the inner cylinder is not connected to the upper end of the roller plate.

[0014] Preferably, a sealing ring, a bearing, a retaining ring, an inner labyrinth seal, an outer labyrinth seal, a cover, and a protective cover are sequentially installed in the bearing seat.

[0015] Compared with the prior art, the assembly method of the variable-taper self-adjusting idler provided by the present invention has the following advantages: 1. Improve assembly accuracy: Through detailed cleaning, pretreatment and coaxiality detection steps, ensure that all parts are assembled in place and improve the overall assembly accuracy.

[0016] 2. Enhanced sealing performance: Filling and pressing of labyrinth seal and labyrinth outer seal, as well as sealing test, ensure that the roller has good sealing performance to prevent grease leakage and contaminants from entering.

[0017] 3. Ensure lubrication effect: Accurate grease filling amount and filling position ensure that the bearing and sealing cavity are fully lubricated, reduce friction and wear, and extend service life.

[0018] 4. Improve dynamic balancing performance: Through dynamic balancing test, adjust the imbalance of the roller to ensure smooth and vibration-free operation, thereby improving operational stability and reliability.

[0019] 5. Improve overall performance: After rigorous inspection and testing, ensure that the dimensional accuracy, sealing performance, lubrication effect and dynamic balance performance of the rollers meet the requirements, thereby improving the overall performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a roller group in the prior art.

[0022] Figure 2 It is a schematic structural diagram of the self-adjusting idler of the present invention.

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure of AA.

[0024] Figure 4 It is a structural schematic diagram of the central axis of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the self-adjusting idler roller group of the present invention.

[0026] In the figure: roller frame 01, middle roller 02, deviation adjustment roller 03, inner cylinder 31, roller body 32, central shaft 33, elastic member 34, support rod 35, roller ring plate 36, sleeve 37, rotating disk 38, connecting disk 39, bearing seat 04, sealing ring 05, bearing 06, retaining ring 07, labyrinth inner seal 08, labyrinth outer seal 09, cover 10, protective cover 20, annular rib 30, conveyor belt 40. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0029] In one embodiment, the present invention provides a method for assembling a tapered variable self-adjusting idler, comprising the following steps: Step S1: remove iron filings, dust and other debris on the parts to be assembled, the specific method is as follows; Use a marker pen to mark the part number on the non-matching surface to avoid confusion; Soak the parts (center shaft, bearing seat) in kerosene for 10 minutes, and use a nylon brush to remove surface oil and iron filings; Transfer the parts to an ultrasonic cleaner (frequency 40kHz, temperature 50°C), add alkaline cleaning agent (pH 9-10), and clean for 15 minutes; Use compressed air (pressure 0.4-0.6MPa) to blow dry the inner cavity of the part, then wipe the surface with a dust-free cloth and visually check for residual stains; Spray a thin layer of anti-rust oil (ISO VG32 standard) on the non-assembly surface of the parts, with a spraying distance of 200mm and a coverage rate of ≥95%; wrap the assembly surface (such as the center shaft journal and bearing seat hole) with plastic wrap to prevent secondary contamination; Step S2: adjusting the elastic member to fit into the designated position of the inner cylinder, and temporarily fixing the position of the elastic member by wrapping it with a high temperature resistant tape; Step S3: fix the inner cylinder on the welding fixture, adjust the coaxiality of the bearing seats at both ends of the inner cylinder and the inner cylinder, weld the two bearing seats to the two ends of the inner cylinder respectively by welding, and use a three-coordinate measuring instrument to detect the coaxiality of the bearing seat and the inner cylinder to ensure that it meets the requirements; weld the end of the elastic member to the end of the bearing seat by welding; locally heat the weld area to 300°C (monitored by an infrared thermometer), keep warm for 10 minutes, slowly cool, and perform stress relief annealing; Step S4: Use a high-pressure grease gun to fill the bearing gap with mining lithium-based grease, and at the same time fill 2 / 3 of the gaps between the labyrinth inner seal, the labyrinth outer seal, the protective cover, and the cover with mining lithium-based grease; Step S5: Assemble the inner seal of the labyrinth, the outer seal of the labyrinth, and the cover according to the requirements of the drawing to form a sealing ring assembly; Step S6: Insert one end of the central shaft into the inner cylinder along one of the bearing seats, so that the central shaft is in the specified position, and press the sealing ring, bearing, retaining ring, sealing ring assembly, and protective cover into the bearing seats at both ends of the central shaft in sequence by press-fitting; when press-fitting, first install the special pressing head into the press-fitting machine, and apply molybdenum disulfide grease (thickness 0.05mm) on the contact surface of the pressing head to reduce the pressing resistance.

[0030] Step S7: Connect the roller plate to one end of the support rod through a pin and a split pin, and then connect the other end of the support rod to the end of the elastic member through a pin and a split pin, and finally connect the tail of the roller plate to the bearing seat through a pin and a split pin. After the assembly is completed, ensure that the coaxiality of the roller body meets the requirements; Step S8: Inspect and test the assembled self-aligning roller to ensure that it meets the use requirements.

[0031] Specifically, in step S3, the bearing seat is welded by using CO2 gas shielded welding, and the welding parameters are: set current 130A, voltage 22V, welding speed 300mm / min; weld requirements: continuous welding, weld height 3mm, no undercut and pores; remove the tape, and use argon arc welding to spot weld 3 places between the end of the elastic part and the bearing seat, with a weld point diameter ≤2mm and a spacing of 30mm.

[0032] Specifically, in step S4, when filling the lithium-based grease for mining, put the lithium-based grease into a thermostat, heat it to 40±2°C, stir it until there are no lumps, and pre-empt the air from the high-pressure grease gun before use, and calibrate the grease injection amount to an error of ≤±1%. When filling the lithium-based grease for mining into the bearing, place the inner ring of the bearing upwards, and use a high-pressure grease gun to inject grease from the ball gap until the grease overflows from the outer ring; the grease injection amount of the single-sided bearing is 8±0.5g, and it is weighed and confirmed with an electronic scale (accuracy 0.1g).

[0033] Specifically, in step S6, when press-fitting the bearing, pay attention to the direction of the open end of the nylon cage of the bearing facing outward, adjust the appropriate pressure, ensure that all parts must be press-fitted into place, and must not be deformed by pressure; when press-fitting each part, adjust the length of the plug in the pressure head, and ensure that the two grooves on the center axis are in the correct position in the roller so that the retaining ring can be installed correctly.

[0034] Of course, when press-fitting the bearing, the outer ring of the bearing is coated with a low-temperature refrigerant (-196°C liquid nitrogen), the outer diameter is reduced by 0.03mm, and it is quickly pressed into the bearing seat with the cage opening facing outward.

[0035] Specifically, in step S7, when installing the roller plate, use a feeler gauge to detect the axial clearance between the roller plate and the bearing seat (0.1-0.3mm), and grind the end face of the support rod if it exceeds the tolerance. The holes of the pin and the support rod need to be matched for installation, and the contact area should be checked with red lead powder before assembly to be ≥80%.

[0036] Specifically, in step S8, the self-aligning roller is tested including static testing and dynamic testing; Static inspection: measure the entire length of the shaft with a micrometer; Dynamic test: Run at 500 rpm for 2 hours on the test bench under no-load conditions, and use an infrared thermal imager to monitor the bearing temperature rise to ≤35°C; apply a radial load of 5kN under load conditions, and use a vibration analyzer to detect the vibration speed to ≤4.5mm / s, with no abnormal peaks in the spectrum.

[0037] Please see Figure 3 to Figure 4In one embodiment, the present invention further provides a tapered variable self-adjusting idler, which includes an inner cylinder 31, a roller body 32, a central shaft 33, an elastic member 34, and a support rod 35; the central shaft 33 is coaxially built into the inner cylinder 31, and the two ends of the central shaft 33 are rotatably adapted to the inner cylinder 31. The roller body 32 includes a plurality of roller ring plates 36 that are evenly spaced along the circumference of the inner cylinder 31, and the upper end of each roller ring plate 36 is a free end, and the lower end is hinged to the lower end of the inner cylinder 31. The gap width between adjacent roller ring plates 36 is 1-5mm; the gap is filled with a polyurethane elastomer or a silicone damping block, and the hardness of the damping block is Shore A 50-80. The number of support rods 35 is consistent with the number of roller plates 36, and the lower end of each support rod 35 is hinged to the inner wall of the roller plate 36; the upper end of the elastic member 34 is connected to the upper end of the inner cylinder 31, and the elastic member 34 is sleeved on the inner cylinder, and the lower end of the elastic member 34 is hinged to the upper end of the support rod 35. When the conveyor belt deviates to one side, the pressure on the roller body 32 on the deviated side increases, and the pressure is transmitted to the support rod 35 through the roller plate 36, thereby compressing the elastic member 34, causing the roller plate 36 to rotate inward around one end hinge point, and finally forming a conical shape with a small outer diameter and a large inner diameter. The deviation correction force is generated through the linear speed difference and the change of friction force, so that the belt is returned to the right position.

[0038] Of course, the gap between adjacent roller plates 36 can also be a wedge-shaped gap with a gradient width, with a gap inlet width W1=2±0.5mm and an outlet width W2=1±0.2mm. When the belt deviation Δ≥10mm, the wedge-shaped gap of the roller plates 36 can cause the deviation correction force F to increase nonlinearly according to F=K·Δ³, K=0.5-1.2N / mm³.

[0039] To explain specifically, the two ends of the inner cylinder 31 are provided with bearing seats 04 rotatably connected to the two ends of the central axis 33, the bearing seat 04 located at the lower end of 31 is hinged to the lower end of the roller plate 36, and the bearing seat 04 located at the upper end of 31 is not connected to the upper end of the roller plate 36.

[0040] Among them, a sealing ring 05, a bearing 06, a retaining ring 07, a labyrinth inner seal 08, a labyrinth outer seal 09, a cover 10, and a protective cover 20 are installed in the bearing seat 04 in sequence.

[0041] Specifically, an annular rib 30 is provided on the bearing seat 04 at the upper end of the inner cylinder 31 to prevent the tape from deviating beyond a preset range. The height of the annular rib 30 is 10-15 mm, and the inner wall of the annular rib 30 is covered with a rubber buffer layer with a hardness of Shore A 70-90.

[0042] Specifically, the roller plate 36 is in an arc or V shape, and its curvature radius matches the running track of the belt to enhance the centering guiding effect of the belt. The arc curvature radius R of the roller plate 36 satisfies: R = 0.8-1.2 times the belt width, and the arc surface is coated with a tungsten carbide coating by a thermal spraying process, and the coating thickness is 0.5-1.2mm. The arc curvature radius R of the roller plate 36 and the belt width B satisfy the relationship: R = (0.9B)² / (8h) + h / 2, where h is the maximum allowable deviation of the belt, h=50-150mm.

[0043] Please see Figure 5 In one embodiment, the present invention further provides a tapered variable self-adjusting roller group, including a roller frame 01, an intermediate roller 02 rotatably arranged on the roller frame 01, and a self-adjusting roller 03, wherein the self-adjusting roller 03 is symmetrically arranged on both sides of the intermediate roller 02.

[0044] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for assembling a tapered self-adjusting idler, characterized in that: The following steps are involved: Step S1: remove iron filings, dust and other debris on the parts to be assembled; Step S2: adjusting the elastic member to fit into the designated position of the inner cylinder, and fixing the position of the elastic member by winding with a high temperature resistant tape; Step S3: fix the inner cylinder on the welding fixture, adjust the coaxiality of the bearing seats at both ends of the inner cylinder and the inner cylinder, weld the two bearing seats to the two ends of the inner cylinder respectively by welding, and use a three-coordinate measuring instrument to detect the coaxiality of the bearing seat and the inner cylinder to ensure that it meets the requirements; weld the end of the elastic member to the end of the bearing seat by welding; Step S4: Use a high-pressure grease gun to fill the bearing gap with mining lithium-based grease, and at the same time fill 2 / 3 of the gaps between the labyrinth inner seal, the labyrinth outer seal, the protective cover, and the cover with mining lithium-based grease; Step S5: Assemble the inner seal of the labyrinth, the outer seal of the labyrinth, and the cover according to the requirements of the drawing to form a sealing ring assembly; Step S6: insert one end of the central shaft into the inner cylinder along one of the bearing seats, so that the central shaft is at a specified position, and press the sealing ring, bearing, retaining ring, sealing ring assembly, and protective cover into the bearing seats at both ends of the central shaft in sequence by press-fitting; Step S7: Connect the roller plate to one end of the support rod through a pin and a split pin, and then connect the other end of the support rod to the end of the elastic member through a pin and a split pin, and finally connect the tail of the roller plate to the bearing seat through a pin and a split pin. After the assembly is completed, ensure that the coaxiality of the roller body meets the requirements; Step S8: Inspect and test the assembled self-aligning roller to ensure that it meets the use requirements.

2. The method for assembling the tapered self-adjusting idler according to claim 1, characterized in that: In step S3, the bearing seat is welded using CO2 gas shielded welding, and the welding parameters are: set current 130A, voltage 22V, welding speed 300mm / min; weld requirements: continuous welding, weld height 3mm, no undercut and pores; remove the tape, and use argon arc welding to spot weld 3 places between the end of the elastic part and the bearing seat, with a weld point diameter ≤2mm and a spacing of 30mm.

3. The method for assembling the variable taper self-adjusting idler according to claim 2, characterized in that: In step S4, when filling in mining lithium-based grease, the lithium-based grease is placed in a constant temperature box, heated to 40±2°C, and stirred until there are no lumps. The high-pressure grease gun is evacuated of air before use, and the grease injection amount is calibrated to an error of ≤±1%.

4. The method for assembling the tapered self-adjusting idler according to claim 3 is characterized in that: In step S6, when press-fitting the bearing, pay attention to the direction of the open end of the nylon cage of the bearing facing outward, adjust the appropriate pressure, ensure that all parts must be press-fitted into place, and must not be deformed by pressure; when press-fitting each part, adjust the length of the plug in the pressure head, and ensure that the two grooves on the center axis are in the correct position in the roller so that the retaining ring can be installed correctly.

5. The method for assembling a tapered self-adjusting idler according to claim 4, characterized in that: When press-fitting the bearing, apply low-temperature refrigerant to the outer ring of the bearing, reduce the outer diameter by 0.03mm, and quickly press it into the bearing seat with the cage opening facing outward.

6. The method for assembling a tapered self-adjusting idler according to claim 5, characterized in that: In step S7, when installing the roller plate, the axial clearance between the roller plate and the bearing seat is detected with a feeler gauge, and the end face of the support rod is ground if the clearance exceeds the tolerance.

7. The method for assembling a tapered self-adjusting idler according to claim 6, characterized in that: In step S8, the self-aligning roller is tested including static inspection and dynamic test; Static inspection: measure the entire length of the shaft with a micrometer; Dynamic test: Run at 500 rpm for 2 hours on the test bench under no-load conditions, and use an infrared thermal imager to monitor the bearing temperature rise to ≤35°C; apply a radial load of 5kN under load conditions, and use a vibration analyzer to detect the vibration speed to ≤4.5mm / s, with no abnormal peaks in the spectrum.

8. The method for assembling a tapered self-adjusting idler according to claim 1, characterized in that: The self-adjusting eccentric roller includes an inner cylinder, a roller body, a central axis, an elastic member, and a support rod; the central axis is coaxially built in the inner cylinder, and the two ends of the central axis are rotatably adapted to the inner cylinder; the roller body includes a plurality of roller ring plates evenly spaced along the circumference of the inner cylinder, the upper end of each roller ring plate is a free end, and the lower end is hinged to the lower end of the inner cylinder; the number of the support rods is consistent with the number of the roller ring plates, and the lower end of each support rod is correspondingly hinged to the inner wall of the roller ring plate; the upper end of the elastic member is connected to the upper end of the inner cylinder, and the lower end of the elastic member is correspondingly hinged to the upper end of the support rod.

9. The method for assembling a variable taper self-adjusting idler according to claim 2, characterized in that: The two ends of the inner cylinder are provided with bearing seats rotatably connected to the two ends of the central axis. The bearing seat located at the lower end of the inner cylinder is hinged to the lower end of the roller plate, and the bearing seat located at the upper end of the inner cylinder is not connected to the upper end of the roller plate.

10. The method for assembling a tapered self-adjusting roller according to claim 3, characterized in that: The bearing seat is provided with a sealing ring, a bearing, a retaining ring, a labyrinth inner seal, a labyrinth outer seal, a cover and a protective cover in sequence.

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