Composite roller and preparation method thereof

Abstract

The present application relates to the technical field of conveying equipment, and specifically, to a composite roller and a method for preparing the same. The composite roller is applied to a conveyor belt system and comprises: a connecting shaft, with both ends respectively fixed to a mounting plate; a bearing seat sleeved on both ends of the connecting shaft; a bearing sleeved on the bearing seat; and a roller body sleeved on the bearing, with its surface in contact with the conveyor belt for supporting the conveyor belt; wherein the roller body comprises the following components: 6-20 parts of quartz sand, 5-10 parts of polypropylene, and 1-3 parts of graphite. By adopting the above technical solution, by setting the components of the roller body to quartz sand, polypropylene, and graphite, the wear resistance of the composite roller in complex environments can be improved, so that the quality of the composite roller in specific environments is significantly better than that of the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of conveying equipment, and in particular to a composite roller and a preparation method thereof. Background Art

[0002] Belt conveyors are a fundamental form of material transportation in modern industry, widely used in industries such as mining, metallurgy, ports, thermal power, and cement and building materials. Specifically, in coal mines and other work environments, materials such as coal slag and soil are often transported from underground to designated locations via conveyor belts. For details, see Chinese invention patent application CN118850626A. As critical consumable components in conveyor belt systems, rollers' lifespan and performance significantly impact conveying efficiency and costs.

[0003] Compared with traditional metal rollers, composite rollers made of non-metallic materials have advantages in anti-deformation, anti-static, anti-magnetic, wear resistance and service life, but there is still room for improvement.

[0004] In view of this, this application is filed. Summary of the Invention

[0005] The purpose of this application is to provide a composite roller and a preparation method thereof to solve at least one technical problem mentioned in the background technology.

[0006] Specifically, in a first aspect of the present application, a composite roller is provided, comprising:

[0007] Connecting shaft, both ends of which are connected to the mounting plate.

[0008] The bearing seat is mounted on both ends of the connecting shaft.

[0009] The bearing is arranged in the bearing seat and can rotate relative to the connecting shaft.

[0010] The sealing structure is arranged in the bearing seat and seals the bearing.

[0011] The roller body is sleeved on the outside of the bearing upper seat, and its surface contacts the conveyor belt, and is used to support the conveyor belt;

[0012] Wherein, the roller body includes the following components:

[0013] 6-20 parts of quartz sand,

[0014] Polypropylene 5-10 parts,

[0015] 1-3 parts of graphite.

[0016] By adopting the above technical solution, by setting the components of the roller body to quartz sand, polypropylene, and graphite, the wear resistance of the composite roller in complex environments can be improved, making the quality of the composite roller significantly better than that of the existing technology in specific environments.

[0017] Preferably, the roller body further includes:

[0018] Carbon black 0.5-2 parts.

[0019] Preferably, the roller body further includes:

[0020] Wear-resistant additive 0.08-0.5 parts,

[0021] The wear-resistant additives include:

[0022] The mass ratio of polytetrafluoroethylene, stearic acid and sodium carboxymethyl cellulose is 5-8:1-2:1.

[0023] Preferably, the preparation method of the wear-resistant additive comprises the steps of:

[0024] Take the labeled amount of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water, the temperature of which is 30-50°C, to prepare a sodium carboxymethyl cellulose solution.

[0025] Take polytetrafluoroethylene and stearic acid and place them in a fluidized bed.

[0026] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 5-20 L / h, the inlet air temperature of the fluidized bed is 45-55 ° C, and the inlet air volume is 10-20 m 3 / h, atomization pressure is 0.5-1.5Bar;

[0027] After spraying, the mixture was dried at 40-55°C for 10-40 minutes to obtain composite A particles.

[0028] Preferably, the composite A with a particle size of 200-500 μm is screened as the wear-resistant additive.

[0029] Preferably, polytetrafluoroethylene and stearic acid are taken, passed through a 16-mesh sieve, and placed in a fluidized bed.

[0030] Preferably, the roller body further includes:

[0031] Flame retardant 0.2-2 parts,

[0032] The flame retardant is selected from boron flame retardants or phosphorus flame retardants.

[0033] Preferably, the boron-based flame retardant is zinc borate, and the phosphorus-based flame retardant is aluminum hypophosphite.

[0034] Preferably, the roller body further includes:

[0035] Lubricant 0.05-0.2 parts,

[0036] The lubricant is selected from paraffin or molybdenum disulfide.

[0037] Preferably, the roller body further includes:

[0038] Polyethylene glycol 8000 0.01-0.1 parts.

[0039] Preferably, the roller body does not contain silicon dioxide, or more preferably, the silicon dioxide content in the roller body is not higher than 0.01 parts or not higher than 0.012% by mass.

[0040] A second aspect of the present application provides a method for preparing a composite roller, comprising the steps of:

[0041] Prepare the raw materials for the rollers,

[0042] Preparation of roller body,

[0043] Assemble and form,

[0044] The step of preparing the roller body specifically includes:

[0045] Stir the raw materials, put the prepared raw materials into the blender and stir for 10-60 minutes.

[0046] Raw material extrusion: put the components obtained in the raw material stirring step into the extruder and heat at 100-240℃ for 10-30min.

[0047] Compression molding: placing the components obtained in the raw material extrusion step into a pressing machine mold for compression molding.

[0048] Preferably, the preparation of the raw materials for the rollers includes the steps of:

[0049] The raw materials were sieved to make the particle size no larger than 500 μm.

[0050] Preferably, the extruder includes a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section and a die head heating section, and the heating temperatures are 100-120°C, 120-160°C, 160-200°C, 200-240°C, 240-180°C, and the heating times are 2-5min, 2-5min, 2-10min, 2-5min, and 2-5min, respectively.

[0051] Preferably, the roller body further includes:

[0052] Wear-resistant additive 0.08-0.5 parts,

[0053] The wear-resistant additives include:

[0054] The mass ratio of polytetrafluoroethylene, stearic acid and sodium carboxymethyl cellulose is 5-8:1-2:1.

[0055] Preferably, the preparation method of the wear-resistant additive comprises the steps of:

[0056] Take the labeled amount of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water, the temperature of which is 30-50°C, to prepare a sodium carboxymethyl cellulose solution.

[0057] Take polytetrafluoroethylene and stearic acid and place them in a fluidized bed.

[0058] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 5-20 L / h, the inlet air temperature of the fluidized bed is 45-55 ° C, and the inlet air volume is 10-20 m 3 / h, atomization pressure is 0.5-1.5Bar;

[0059] After spraying, the mixture was dried at 40-55°C for 10-40 minutes to obtain composite A particles.

[0060] Preferably, the composite A with a particle size of 200-500 μm is screened as the wear-resistant additive.

[0061] Preferably, polytetrafluoroethylene and stearic acid are taken, passed through a 16-mesh sieve, and placed in a fluidized bed.

[0062] In summary, this application has the following beneficial effects:

[0063] First, the composite roller provided in this application can improve the wear resistance of the composite roller in complex environments by setting the components of the roller body to quartz sand, polypropylene, and graphite, so that the quality of the composite roller in specific environments is significantly better than that of the existing technology.

[0064] Second, the composite roller provided in this application can further improve the wear resistance of the composite roller in a specific environment by providing a wear-resistant additive of a specific component, thereby extending its working life and thereby improving the conveying efficiency of the conveyor belt; under the same industrial and mining conditions, the service life of the composite roller provided in this application is more than 5 times that of ordinary steel rollers and more than 2-3 times that of ordinary non-metallic rollers; at the same time, in a complex working environment, it is more corrosion-resistant than metal materials.

[0065] Third, the preparation method of the composite roller provided in this application has a simple process, can make the raw materials quickly molded, has reliable quality, is lighter in weight, is 1 / 3 the weight of a steel roller, is easy to install and maintain, can significantly reduce the labor intensity of workers, and has good commercial prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0067] Figure 1 Schematic diagram of the structure of the antistatic ability testing equipment in this application;

[0068] Figure 2 This is a working principle diagram of the antistatic ability testing equipment in this application;

[0069] Figure 3 Schematic diagram of the structure of the composite roller in some embodiments of the present application.

[0070] Marking description: Through the above-mentioned figure marking description, combined with the embodiments of the present application, the technical solution of the present application can be more clearly understood and explained.

[0071] 10. Connecting shaft; 20. Bearing seat; 30. Bearing; 40. Sealing structure; 50. Roller body. DETAILED DESCRIPTION

[0072] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0073] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0074] The present application will be described in detail below through examples.

[0075] In the existing technology, belt conveyor is the basic form of modern industrial material transportation, and is widely used in mining, metallurgy, ports, thermal power, cement and building materials and other industries. Specifically in coal mines and other working scenarios, it is usually necessary to transport materials such as coal slag and soil from underground to designated locations through conveyor belts. As important consumable components in the conveyor belt system, the life and performance of rollers have a huge impact on conveying efficiency and conveying costs. Compared with traditional metal rollers, composite rollers made of non-metallic materials have advantages in anti-deformation, anti-static, anti-magnetic, wear resistance and service life. However, in some specific harsh environments such as wet flue gas desulfurization, the service life of non-metallic composite rollers is still unsatisfactory.

[0076] In view of this, in order to solve the existing technical problems in the background technology, the inventive concept of this application is to provide a composite roller and a preparation method thereof, wherein the composite roller is applied to a conveyor belt system, including: a connecting shaft, both ends of which are respectively fixed to the mounting plate; a bearing seat, which is sleeved on both ends of the connecting shaft; a bearing, which is sleeved on the bearing seat; a roller body, which is sleeved on the bearing, and its surface is in contact with the conveyor belt, and is used to support the conveyor belt; wherein the roller body includes the following components: 6-20 parts of quartz sand, 5-10 parts of polypropylene, and 1-3 parts of graphite.

[0077] According to the inventive concept, by setting the components of the roller body to quartz sand, polypropylene, and graphite, the wear resistance of the composite roller in complex environments can be improved, making the quality of the composite roller significantly better than that of the existing technology in specific environments.

[0078] To better understand the above technical solution, the following will be described in detail with reference to specific embodiments. Those skilled in the art will also understand that the reaction times and drug dosing times involved in this application cannot be achieved with absolute precision in actual production processes, but are within the allowable error range. For example, if a sample is expected to be heated for 30 minutes, the actual operation may be 1 second over or under 30 minutes; if a 30g sample is expected to be weighed, the actual weighing may be 30.001g or 29.998g.

[0079] Experimental Example 1 Wet Flue Gas Desulfurization Environment Simulation Experiment

[0080] This experimental example is intended to simulate a wet flue gas desulfurization environment, which usually significantly reduces the service life of the rollers.

[0081] The temperature of the experimental chamber was controlled at 60±1℃ and the humidity was 75%, and sulfur dioxide gas was added to make its content 1g / m 3 .

[0082] The samples to be tested are placed in the above-mentioned experimental box for 30 days.

[0083] Experimental Example 2: Room Temperature Storage Experiment

[0084] The temperature of the experimental chamber was controlled at 25±1℃ and the humidity was 30%.

[0085] The samples to be tested are placed in the above-mentioned experimental box for 30 days.

[0086] Experimental Example 3 Flame retardant test experiment

[0087] The test was conducted in a combustion chamber. A 400cc alcohol burner was installed on the left inner side of the chamber, and a specimen holder was located on the right inner side. The burner was tilted upward at 45° and equipped with an advance and retreat mechanism. The test used industrial pure alcohol (95% or higher) as the fuel.

[0088] Experimental steps: Draw a mark on the wide surface of the specimen at 25mm and 100mm away from the ignition source. Then place the specimen horizontally with its long axis and fix it to the specimen clamp at a 45° angle with the horizontal axis of its cross section. Place a water tray 300mm below it. Light the alcohol burner, adjust the flame length to 25mm and turn it into a blue flame, and control the distance between the flame core and the bottom edge of the specimen to about 6mm. Start timing and apply the flame for 30 seconds. Do not move the alcohol burner during this period. After the time is up, remove the flame and observe whether the specimen is burning and keep a record. The same specimen is considered qualified if it is tested twice without burning.

[0089] Experimental Example 4 Test method for antistatic ability

[0090] The equipment uses ZC46A high insulation resistance measuring instrument to measure the upper and lower surface resistance values of the sample.

[0091] Instrument structure: It mainly consists of five parts, such as Figure 1 shown.

[0092] (1) DC high voltage output: 10, 50, 100, 500, 1000V;

[0093] (2) Select the appropriate range multiplier according to the resistance value and DC high voltage value of the sample;

[0094] (3) High input impedance DC amplifier (input impedance > 1015 Ω);

[0095] (4) Indicating instrument, indicating the insulation resistance being measured;

[0096] (5) The power supply provides working power to all parts of the instrument.

[0097] The main principle of the instrument when performing high resistance test is as follows Figure 2As shown, during the test, the test sample resistance Rx is connected in series with the input resistance (multiplier resistance) Ro of the high-impedance DC amplifier and connected across the DC power supply. The high-impedance DC amplifier amplifies the divided voltage Uo on its input resistance Ro and sends it to the indicator to indicate the measured insulation resistance value, and calculates the insulation resistance according to formula (a).

[0098]

[0099] Among them, U represents the test voltage, Ro represents the rate sampling resistor, the voltage on it is Uo, Rx represents the insulation resistance of the sample under test, and Ko represents the amplification factor of the amplifier.

[0100] Experimental Example 5 Wear Resistance Test

[0101] The Akron abrasion test is adopted, and its specific method can be referred to GB / T1689-2014.

[0102] The Akron wear loss of the material is expressed as a percentage of mass loss per unit travel (g / 1.61km) and is calculated according to formula (b)

[0103]

[0104] Where x represents the mass loss percentage, M represents the mass loss (g / 1.61 km), and M0 represents the initial mass of the tested sample.

[0105] Experimental Example 6

[0106] Experimental Plan A

[0107] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, and 0.1 parts of molybdenum dioxide, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0108] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0109] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0110] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0111] Experimental Plan B

[0112] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.12 parts of polytetrafluoroethylene, and sieve the above raw materials before weighing to make the particle size no greater than 500 μm;

[0113] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0114] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0115] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0116] Experimental Plan C

[0117] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, 0.12 parts of polytetrafluoroethylene, and 0.02 parts of sodium carboxymethyl cellulose, and sieve each of the above raw materials before weighing to make the particle size no greater than 500 μm;

[0118] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0119] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0120] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0121] Experimental Plan D

[0122] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, 0.12 parts of polytetrafluoroethylene, 0.03 parts of stearic acid, and 0.02 parts of sodium carboxymethyl cellulose, and sieve each of the above raw materials before weighing to make the particle size no greater than 500 μm;

[0123] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0124] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0125] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0126] Experimental Plan E

[0127] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, 0.12 parts of polytetrafluoroethylene, and 0.1 parts of silicon dioxide, and sieve each of the above raw materials before weighing to make the particle size no greater than 500 μm;

[0128] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0129] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0130] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0131] Experimental Plan F

[0132] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, 0.12 parts of polytetrafluoroethylene, 0.1 parts of silicon dioxide, 0.03 parts of stearic acid, and 0.02 parts of sodium carboxymethyl cellulose, and sieve the above raw materials before weighing to make the particle size no greater than 500 μm;

[0133] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0134] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0135] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0136] Experimental Plan G

[0137] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0138] Weigh 0.6 parts of polytetrafluoroethylene and 0.15 parts of stearic acid, pass through a 16-mesh sieve, and place in a fluidized bed.

[0139] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 10 L / h, the inlet air temperature of the fluidized bed is 50°C, and the inlet air volume is 15 m 3 / h, atomization pressure is 1.0Bar;

[0140] After spraying, the mixture was dried at 50°C for 30 min to obtain composite A particles.

[0141] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0142] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0143] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0144] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0145] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0146] Experimental Plan H

[0147] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0148] Weigh 0.6 parts of polytetrafluoroethylene, 0.15 parts of stearic acid, and 0.5 parts of silicon dioxide, pass through a 16-mesh sieve, and place in a fluidized bed.

[0149] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 10 L / h, the inlet air temperature of the fluidized bed is 50°C, and the inlet air volume is 15 m 3 / h, atomization pressure is 1.0Bar;

[0150] After spraying, the mixture was dried at 50°C for 30 min to obtain composite A particles.

[0151] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0152] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0153] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0154] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0155] The components obtained in the previous step were placed in a pressing machine mold and pressed to form a roller body. Experimental Scheme I The roller body was prepared by referring to the preparation method of Example 1 in Chinese invention patent CN1310809C.

[0156] The roller bodies obtained from Experimental Schemes A to B were placed under the environments of Experimental Examples 1 and 2 for 30 days, respectively. The wear resistance of each scheme was measured according to the method of Experimental Example 5, as shown in Table 1.

[0157] Table 1 Wear resistance of experimental schemes AH under different environments

[0158] Group Experimental Example 1 Environment (%) Experimental Example 2 Environment (%) Experimental Plan A 1.08 0.60 Experimental Plan B 1.10 0.58 Experimental Plan C 1.04 0.61 Experimental Plan D 0.92 0.55 Experimental Plan E 1.02 0.52 Experimental Plan F 1.16 0.50 Experimental Plan G 0.68 0.46 Experimental Plan H 0.86 0.49 Experimental Plan I 1.98 1.02

[0159] Based on the experimental results in Table 1, the applicant can preliminarily deduce the following conclusions:

[0160] First, referring to Experimental Scheme 1, the wear resistance of the conventional idler roller body will be significantly reduced under the environment of Experimental Example 1, indicating that the adaptability of the conventional idler roller body in this environment is poor and needs to be improved;

[0161] Second, compared to Experimental Scheme I, Experimental Schemes AH provided in this application have better wear resistance properties regardless of the environment of Example 1 or Example 2;

[0162] Third, by comparing experimental scheme D with experimental schemes AC, it can be seen that when the wear-resistant additives include polytetrafluoroethylene, stearic acid and sodium carboxymethyl cellulose at the same time, the wear resistance of the roller body is more greatly promoted;

[0163] Fourth, comparing Experimental Scheme D with Experimental Schemes EF, it can be seen that adding silica, a commonly used wear-resistant ingredient, to the wear-resistant additive does not improve the wear resistance of the product under the environment of Experimental Example 1, and may even have an adverse effect. The applicant speculates that this environment may cause the denaturation of silica.

[0164] Fifth, comparing Experimental Scheme G with Experimental Scheme D, pre-preparing the wear-resistant additive through a fluidized bed can further improve its wear resistance under the environment of Experimental Example 1. The applicant speculates that the components can be fully mixed through the granulation process of the fluidized bed, and the sodium carboxymethyl cellulose can be encapsulated to increase the wear resistance in acidic air. Example 1

[0165] Weigh 6 parts of quartz sand, 5 parts of polypropylene, 1 part of graphite, 0.2 parts of zinc borate, and 0.05 parts of molybdenum dioxide, and sieve the above raw materials before weighing to make the particle size no greater than 500 μm;

[0166] Place the prepared raw materials into a blender and stir for 10 minutes to fully mix the raw materials;

[0167] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 100°C, 120°C, 160°C, 200°C, and 180°C, respectively, and the heating times were 5 min, 5 min, 10 min, 5 min, and 5 min, respectively.

[0168] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 2

[0169] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, and 0.1 parts of molybdenum dioxide, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0170] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0171] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0172] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 3

[0173] Weigh 20 parts of quartz sand, 10 parts of polypropylene, 3 parts of graphite, 2 parts of zinc borate, and 0.2 parts of molybdenum dioxide, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0174] Place the prepared raw materials into a blender and stir for 60 minutes to fully mix the raw materials;

[0175] The components obtained in the previous step are placed into an extruder, which includes a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section and a die head heating section. The heating temperatures are 120°C, 160°C, 200°C, 240°C, and 240°C, respectively, and the heating times are 2 min, 2 min, 2 min, 2 min, and 2 min, respectively.

[0176] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 4

[0177] Weigh 6 parts of quartz sand, 5 parts of polypropylene, 1 part of graphite, 0.2 parts of zinc borate, 0.05 parts of molybdenum dioxide, 0.05 parts of polytetrafluoroethylene, 0.02 parts of stearic acid, and 0.01 parts of sodium carboxymethyl cellulose, and sieve each of the above raw materials before weighing to make the particle size no greater than 500 μm;

[0178] Place the prepared raw materials into a blender and stir for 10 minutes to fully mix the raw materials;

[0179] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 100°C, 120°C, 160°C, 200°C, and 180°C, respectively, and the heating times were 5 min, 5 min, 10 min, 5 min, and 5 min, respectively.

[0180] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 5

[0181] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, 0.12 parts of polytetrafluoroethylene, 0.03 parts of stearic acid, and 0.02 parts of sodium carboxymethyl cellulose, and sieve each of the above raw materials before weighing to make the particle size no greater than 500 μm;

[0182] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0183] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0184] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0185] Example 6

[0186] Weigh 20 parts of quartz sand, 10 parts of polypropylene, 3 parts of graphite, 2 parts of zinc borate, 0.2 parts of molybdenum dioxide, 0.4 parts of polytetrafluoroethylene, 0.05 parts of stearic acid, and 0.05 parts of sodium carboxymethyl cellulose, and sieve the above raw materials before weighing to make the particle size no greater than 500 μm;

[0187] Place the prepared raw materials into a blender and stir for 60 minutes to fully mix the raw materials;

[0188] The components obtained in the previous step are placed into an extruder, which includes a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section and a die head heating section. The heating temperatures are 120°C, 160°C, 200°C, 240°C, and 240°C, respectively, and the heating times are 2 min, 2 min, 2 min, 2 min, and 2 min, respectively.

[0189] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 7

[0190] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0191] Weigh 0.6 parts of polytetrafluoroethylene and 0.15 parts of stearic acid, pass through a 16-mesh sieve, and place in a fluidized bed.

[0192] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 5 L / h, the inlet air temperature of the fluidized bed is 45°C, and the inlet air volume is 10 m 3 / h, atomization pressure is 0.5Bar;

[0193] After spraying, the mixture was dried at 40°C for 40 min to obtain composite A particles.

[0194] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0195] Weigh 6 parts of quartz sand, 5 parts of polypropylene, 1 part of graphite, 0.2 parts of zinc borate, 0.05 parts of molybdenum dioxide, and 0.08 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0196] Place the prepared raw materials into a blender and stir for 10 minutes to fully mix the raw materials;

[0197] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 100°C, 120°C, 160°C, 200°C, and 180°C, respectively, and the heating times were 5 min, 5 min, 10 min, 5 min, and 5 min, respectively.

[0198] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 8

[0199] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0200] Weigh 0.6 parts of polytetrafluoroethylene and 0.15 parts of stearic acid, pass through a 16-mesh sieve, and place in a fluidized bed.

[0201] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 10 L / h, the inlet air temperature of the fluidized bed is 50°C, and the inlet air volume is 15 m 3 / h, atomization pressure is 1.0Bar;

[0202] After spraying, the mixture was dried at 50°C for 30 min to obtain composite A particles.

[0203] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0204] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0205] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0206] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0207] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body. Example 9

[0208] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0209] Weigh 0.6 parts of polytetrafluoroethylene and 0.15 parts of stearic acid, pass through a 16-mesh sieve, and place in a fluidized bed.

[0210] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 20 L / h, the inlet air temperature of the fluidized bed is 55°C, and the inlet air volume is 20 m 3 / h, atomization pressure is 1.5Bar;

[0211] After spraying, the mixture was dried at 55°C for 10 min to obtain composite A particles.

[0212] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0213] Weigh 20 parts of quartz sand, 10 parts of polypropylene, 3 parts of graphite, 2 parts of zinc borate, 0.2 parts of molybdenum dioxide, and 0.5 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0214] Place the prepared raw materials into a blender and stir for 60 minutes to fully mix the raw materials;

[0215] The components obtained in the previous step are placed into an extruder, which includes a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section and a die head heating section. The heating temperatures are 120°C, 160°C, 200°C, 240°C, and 240°C, respectively, and the heating times are 2 min, 2 min, 2 min, 2 min, and 2 min, respectively.

[0216] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0217] Example 10

[0218] This embodiment is basically the same as embodiment 8, except that:

[0219] When the raw materials are placed in the blender, 0.01 parts of polyethylene glycol 8000 are added. Example 11

[0220] This embodiment is basically the same as embodiment 8, except that:

[0221] When the raw materials are placed in the blender, 0.05 parts of polyethylene glycol 8000 are added. Example 12

[0222] This embodiment is basically the same as embodiment 8, except that:

[0223] When the raw materials are placed in the blender, 0.1 parts of polyethylene glycol 8000 are added. Example 13

[0224] This embodiment is basically the same as embodiment 8, except that:

[0225] The flame retardant zinc borate was replaced by aluminum hypophosphite. Example 14

[0226] This embodiment is basically the same as embodiment 8, except that:

[0227] In the step of weighing the raw materials, carbon black is added, specifically:

[0228] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of carbon black, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive. Before weighing, sieve the above raw materials separately to make the particle size of the raw materials no greater than 500 μm. Example 15

[0229] This embodiment is basically the same as embodiment 8, except that:

[0230] In the step of weighing the raw materials, carbon black is added, specifically:

[0231] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 2 parts of carbon black, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive. Before weighing, sieve the above raw materials separately to make the particle size of the raw materials no greater than 500 μm.

[0232] Comparative Example 1

[0233] The roller body was prepared by referring to the preparation method of Example 1 in Chinese invention patent CN1310809C.

[0234] Comparative Example 2

[0235] Take 0.1 parts of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water at 40°C to prepare a sodium carboxymethyl cellulose solution.

[0236] Weigh 0.6 parts of polytetrafluoroethylene, 0.15 parts of stearic acid, and 0.5 parts of silicon dioxide, pass through a 16-mesh sieve, and place in a fluidized bed.

[0237] The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 10 L / h, the inlet air temperature of the fluidized bed is 50°C, and the inlet air volume is 15 m 3 / h, atomization pressure is 1.0Bar;

[0238] After spraying, the mixture was dried at 50°C for 30 min to obtain composite A particles.

[0239] Screening the composite A with a particle size of 200-500 μm as a wear-resistant additive;

[0240] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive, and sieve the above raw materials before weighing to make the particle size of the raw materials no greater than 500 μm;

[0241] Place the prepared raw materials into a blender and stir for 30 minutes to fully mix the raw materials;

[0242] The components obtained in the previous step were placed into an extruder, which included a feed inlet heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section, and a die head heating section. The heating temperatures were 110°C, 140°C, 180°C, 220°C, and 210°C, respectively, and the heating times were 2 min, 3 min, 5 min, 3 min, and 2 min, respectively.

[0243] The components obtained in the previous step are placed into a pressing machine mold and pressed to form a roller body.

[0244] Comparative Example 3

[0245] This comparative example is basically the same as comparative example 2, except that:

[0246] The amount of silica was adjusted to 0.01 parts.

[0247] Comparative Example 4

[0248] This comparative example is basically the same as Example 8, except that:

[0249] Screening the composite A with a particle size of 500-1000 μm as a wear-resistant additive;

[0250] Weigh 10 parts of quartz sand, 6 parts of polypropylene, 1.25 parts of graphite, 0.5 parts of zinc borate, 0.1 parts of molybdenum dioxide, and 0.17 parts of wear-resistant additive, and sieve the above raw materials respectively to make the raw material particle size 500-1000 μm.

[0251] Comparative Example 5

[0252] Commercially available rubber rollers. Example 16

[0253] The roller bodies prepared according to the methods of Examples 1-15 and Comparative Examples 1-5 were tested for flame retardancy, antistatic ability, and wear resistance using the methods of Experimental Examples 3-5. The test results are shown in Table 2.

[0254] Table 2 Flame retardancy, antistatic ability and wear resistance of the roller bodies in Examples 1-15 and Comparative Examples 1-5

[0255] Group Flame retardant ability Average surface resistance (Ω) Average lower surface resistance (Ω) Wear resistance (%) Example 1 qualified <![CDATA[4.6×10 5 ]]> <![CDATA[5.6×10 6 ]]> 0.59 Example 2 qualified <![CDATA[4.8×10 5 ]]> <![CDATA[5.7×10 6 ]]> 0.61 Example 3 qualified <![CDATA[5.2×10 5 ]]> <![CDATA[6.4×10 6 ]]> 0.59 Example 4 qualified <![CDATA[5.4×10 5 ]]> <![CDATA[6.4×10 6 ]]> 0.55 Example 5 qualified <![CDATA[6.0×10 5 ]]> <![CDATA[7.1×10 6 ]]> 0.57 Example 6 qualified <![CDATA[6.0×10 5 ]]> <![CDATA[6.9×10 6 ]]> 0.54 Example 7 qualified <![CDATA[5.8×10 5 ]]> <![CDATA[6.8×10 6 ]]> 0.51 Example 8 qualified <![CDATA[5.2×10 5 ]]> <![CDATA[6.0×10 6 ]]> 0.50 Example 9 qualified <![CDATA[5.3×10 5 ]]> <![CDATA[6.0×10 6 ]]> 0.52 Example 10 qualified <![CDATA[5.0×10 5 ]]> <![CDATA[5.5×10 6 ]]> 0.52 Example 11 qualified <![CDATA[4.6×10 5 ]]> <![CDATA[5.6×10 6 ]]> 0.51 Example 12 qualified <![CDATA[4.8×10 5 ]]> <![CDATA[5.7×10 6 ]]> 0.51 Example 13 qualified <![CDATA[6.2×10 5 ]]> <![CDATA[7.1×10 6 ]]> 0.51 Example 14 qualified <![CDATA[5.1×10 5 ]]> <![CDATA[6.2×10 6 ]]> 0.48 Example 15 qualified <![CDATA[4.9×10 5 ]]> <![CDATA[5.7×10 6 ]]> 0.46 Comparative Example 1 qualified <![CDATA[8.6×10 5 ]]> <![CDATA[9.8×10 6 ]]> 0.67 Comparative Example 2 qualified <![CDATA[5.0×10 5 ]]> <![CDATA[5.9×10 6 ]]> 0.50 Comparative Example 3 qualified <![CDATA[5.1×10 5 ]]> <![CDATA[6.4×10 6 ]]> 0.52 Comparative Example 4 qualified <![CDATA[5.5×10 5 ]]> <![CDATA[6.6×10 6 ]]> 0.60 Comparative Example 5 qualified <![CDATA[6.1×10 5 ]]> <![CDATA[6.7×10 6 ]]> 1.08

[0256] According to the results in Table 2, we can see that:

[0257] First, the flame retardancy, electrical resistance, and wear resistance of each embodiment proposed in this application all meet the qualified indicators, and the antistatic effect and wear resistance are better than those of the prior art (Comparative Example 1); at the same time, the wear resistance is also significantly better than that of the commercially available rubber roller (Comparative Example 5);

[0258] Second, comparing Example 8 with Example 2, the wear-resistant additive proposed in this application can improve the life of the product in harsh environments, but its antistatic ability is reduced; further comparing Examples 10-12 with Example 8, adding a small amount of polyethylene glycol 8000 to the components can improve the antistatic effect of this product to a certain extent;

[0259] Third, comparing Examples 14-15 with Example 8, adding a small amount of carbon black to the components of the present application can improve the antistatic ability of the product to a certain extent.

[0260] Example 17

[0261] The roller bodies prepared according to the methods of Examples 1-15 and Comparative Examples 1-5 were placed using the method of Experimental Example 1, and then tested for flame retardancy, antistatic ability, and wear resistance using the methods of Experimental Examples 3-5. The test results are shown in Table 3.

[0262] Table 3 Flame retardancy, antistatic ability and wear resistance of the roller bodies in Examples 1-15 and Comparative Examples 1-4

[0263] Group Flame retardant ability Average surface resistance (Ω) Average lower surface resistance (Ω) Wear resistance (%) Example 1 qualified <![CDATA[4.8×10 5 ]]> <![CDATA[5.9×10 6 ]]> 1.10 Example 2 qualified <![CDATA[4.8×10 5 ]]> <![CDATA[5.8×10 6 ]]> 1.08 Example 3 qualified <![CDATA[5.6×10 5 ]]> <![CDATA[6.3×10 6 ]]> 1.14 Example 4 qualified <![CDATA[5.9×10 5 ]]> <![CDATA[6.7×10 6 ]]> 0.90 Example 5 qualified <![CDATA[6.6×10 5 ]]> <![CDATA[7.5×10 6 ]]> 0.92 Example 6 qualified <![CDATA[6.3×10 5 ]]> <![CDATA[7.0×10 6 ]]> 0.89 Example 7 qualified <![CDATA[5.8×10 5 ]]> <![CDATA[6.7×10 6 ]]> 0.70 Example 8 qualified <![CDATA[6.3×10 5 ]]> <![CDATA[7.3×10 6 ]]> 0.68 Example 9 qualified <![CDATA[7.0×10 5 ]]> <![CDATA[8.1×10 6 ]]> 0.65 Example 10 qualified <![CDATA[5.4×10 5 ]]> <![CDATA[6.5×10 6 ]]> 0.68 Example 11 qualified <![CDATA[5.0×10 5 ]]> <![CDATA[6.2×10 6 ]]> 0.65 Example 12 qualified <![CDATA[5.1×10 5 ]]> <![CDATA[6.4×10 6 ]]> 0.69 Example 13 qualified <![CDATA[5.2×10 5 ]]> <![CDATA[6.1×10 6 ]]> 0.73 Example 14 qualified <![CDATA[6.4×10 5 ]]> <![CDATA[7.1×10 6 ]]> 0.71 Example 15 qualified <![CDATA[6.6×10 5 ]]> <![CDATA[7.4×10 6 ]]> 0.70 Comparative Example 1 qualified <![CDATA[9.3×10 5 ]]> <![CDATA[10.1×10 6 ]]> 1.97 Comparative Example 2 qualified <![CDATA[6.0×10 5 ]]> <![CDATA[6.9×10 6 ]]> 0.85 Comparative Example 3 qualified <![CDATA[6.9×10 5 ]]> <![CDATA[8.3×10 6 ]]> 0.78 Comparative Example 4 qualified <![CDATA[6.4×10 5 ]]> <![CDATA[7.6×10 6 ]]> 0.98 Comparative Example 5 qualified <![CDATA[6.7×10 5 ]]> <![CDATA[7.7×10 6 ]]> 1.66

[0264] According to the results in Table 3, we can see that:

[0265] First, the flame retardancy, resistance value, and wear resistance of each embodiment proposed in this application are relatively stable in the high humidity and high sulfur environment of Experimental Example 1, and have significant advantages in wear resistance compared to the prior art (Comparative Example 1 and Comparative Example 5);

[0266] Second, comparing Examples 4-9 with Examples 1-3, the wear-resistant additives proposed in this application can increase the life of the product in harsh environments, but their antistatic ability is reduced. Further comparing Examples 10-12 with Example 8, adding a small amount of polyethylene glycol 8000 to the components can improve the antistatic effect of the product to a certain extent, and the impact in high humidity and high sulfur environments is also small.

[0267] Third, comparing Example 8 with Comparative Example 2, after adding silica to the components, the wear resistance of the product is easily affected in a high-humidity and high-sulfur environment; referring to Comparative Examples 2 and 3, when a smaller amount of silica is added, the effect on the wear resistance is slightly smaller;

[0268] Fourth, by comparing Example 8 with Comparative Example 4, the raw material particle size control in the present application also has a beneficial effect on the antistatic effect and wear resistance of the product in a high-humidity and high-sulfur environment.

[0269] Example 18

[0270] The roller bodies obtained in Example 8 and Comparative Example 5 were respectively applied to the Guizhou Tangzhai Power Plant of the State Power Corporation, whose working environment includes wet flue gas desulfurization, and were operated internally in the on-site conveyor belt system for 6 months.

[0271] The roller body of the comparative example 5 has been obviously worn after being used for 6 months, while the roller body of the embodiment 8 is still intact and can be used normally.

[0272] Example 19

[0273] In some embodiments of the present application, Figure 3 As shown, a composite roller is provided, which is applied to a conveyor belt system and includes:

[0274] The connecting shaft 10 has two ends connected to the mounting plates (not shown) of the conveyor belt system;

[0275] The bearing seats 20 are sleeved on both ends of the connecting shaft 10;

[0276] The bearing 30 is disposed in the bearing seat 20 and is capable of rotating relative to the connecting shaft 10;

[0277] The sealing structure 40 is disposed in the bearing seat 20 and seals the bearing 30;

[0278] The roller body 50 is sleeved on the outside of the bearing seat 20, and its surface is in contact with the conveyor belt (not shown) for supporting the conveyor belt.

[0279] The composite roller obtained in the embodiment of the present application has the following properties:

[0280] First, a longer service life: Under the same mining conditions, the composite graphene rollers offer over five times the life of ordinary steel rollers and over two to three times that of ordinary non-metallic rollers. They also exhibit excellent corrosion resistance even in complex working environments. Second, high wear resistance: Thanks to components such as quartz sand, polypropylene, and graphite, the composite graphene rollers significantly enhance their wear and impact resistance, significantly extending their service life. Third, impact resistance: The composite rollers provided by this application offer excellent impact resistance and can be used directly at the coal drop or impact point of the belt, resolving the issue of non-metallic rollers being easily shattered by impact in existing technologies. Fourth, light weight: At one-third the weight of ordinary steel rollers, they facilitate installation and maintenance, significantly reducing worker workload. Fifth, zero belt damage: With excellent self-lubrication, the roller surface is free of scaling and burrs, minimizing belt wear and extending belt service life. Sixth, low noise levels: Operating noise levels are below 75 decibels, significantly reducing noise levels and improving the noise-prone working environment. Seventh, energy and power saving: Due to the low operating resistance, the belt conveyor's power output can be reduced, saving electricity. Eighth, stable, durable and maintenance-free: maintenance-free design, can be used for a long time after one installation.

[0281] In summary, the composite roller and its preparation method provided in the embodiment of the present invention improve the wear resistance of the composite roller in complex environments by setting the components of the roller body to quartz sand, polypropylene, graphite and other components, solve the technical problem of the narrow application range of rollers in the prior art, achieve a better service life in specific harsh environments, and have good commercial prospects.

[0282] It should be pointed out that for ordinary technicians in this field, the technical features in the above embodiments can be freely combined, and the formed technical solutions also belong to the embodiments disclosed in this application.

[0283] Furthermore, without departing from the principles of the present application, several improvements and modifications may be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A composite roller for use in high sulfur dioxide environments, characterized by: include: Connecting shaft, both ends of which are connected to the mounting plate. The bearing seat is mounted on both ends of the connecting shaft. The bearing is arranged in the bearing seat and can rotate relative to the connecting shaft. The sealing structure is arranged in the bearing seat and seals the bearing. The roller body is sleeved on the outside of the bearing seat, and its surface contacts the conveyor belt, and is used to support the conveyor belt; Wherein, the roller body includes the following components: 6-20 parts of quartz sand, Polypropylene 5-10 parts, 1-3 parts of graphite, Polyethylene glycol 80000.01-0.1 parts; Wear-resistant additive 0.08-0.5 parts, The wear-resistant additive is composed of polytetrafluoroethylene, stearic acid, and sodium carboxymethyl cellulose, and the mass ratio of the three is 5-8:1-2:1; the preparation method of the wear-resistant additive includes the following steps: Take the labeled amount of sodium carboxymethyl cellulose and dissolve it in an appropriate amount of warm water, the temperature of which is 30-50°C, to prepare a sodium carboxymethyl cellulose solution. Take polytetrafluoroethylene and stearic acid and place them in a fluidized bed. The sodium carboxymethyl cellulose solution is sprayed to achieve material mixing in a fluidized bed; wherein the flow rate of the sodium carboxymethyl cellulose solution is 5-20 L / h, the inlet air temperature of the fluidized bed is 45-55 ° C, and the inlet air volume is 10-20 m 3 / h, atomization pressure is 0.5-1.5Bar; After spraying, the mixture is dried at 40-55° C. for 10-40 minutes to obtain particles of complex A. The particles of complex A with a particle size of 200-500 μm are screened and used as a wear-resistant additive.

2. The composite roller according to claim 1, characterized in that: The roller body further comprises: Flame retardant 0.2-2 parts, The flame retardant is selected from boron flame retardants or phosphorus flame retardants.

3. The composite roller according to claim 2, characterized in that: The boron flame retardant is zinc borate, and the phosphorus flame retardant is aluminum hypophosphite.

4. The composite roller according to claim 1 or 2, characterized in that: The roller body further comprises: Lubricant 0.05-0.2 parts, The lubricant is selected from paraffin or molybdenum disulfide.

5. A method for preparing the composite roller according to any one of claims 1 to 4, characterized in that: Including steps: Prepare the raw materials for the rollers, Preparation of roller body, Assemble and form, The step of preparing the roller body specifically includes: Stir the raw materials, put the prepared raw materials into the blender and stir for 10-60 minutes. The raw material is extruded, and the components obtained in the raw material stirring step are placed into an extruder, heated at 100-240° C. for 10-30 minutes, and pressed into shape. The components obtained in the raw material extrusion step are placed into a pressing machine mold for pressing and shaping.

6. The preparation method according to claim 5, characterized in that: The preparation of the raw materials for the roller comprises the following steps: The raw materials were sieved to make the particle size no larger than 500 μm.

7. The preparation method according to claim 5, characterized in that: The extruder includes a feed port heating section, a feed zone heating section, a screw zone heating section, a barrel zone heating section and a die head heating section. The heating temperatures are 100-120°C, 120-160°C, 160-200°C, 200-240°C and 240-180°C, respectively. The heating times are 2-5min, 2-5min, 2-10min, 2-5min and 2-5min, respectively.

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