Self-lubricating gasket capable of intelligently monitoring abrasion

Abstract

The invention discloses a self-lubricating gasket capable of intelligently monitoring wear, the gasket comprises a substrate, a wear-resistant layer and a monitoring part, one side of the substrate is adhered to the inner side of a bearing outer ring, and the wear-resistant layer is arranged on the other side of the substrate; the multiple monitoring parts are arranged around the base in the circumferential direction and comprise conductive wear pieces and resistance sensors, the conductive wear pieces are embedded in the surface of the side, close to the wear-resistant layer, of the base, the resistance sensors are arranged in the base, and the conductive wear pieces are connected with the resistance sensors through positive and negative wires; and the substrate, the wear-resistant layer and the conductive wear sheet are all self-lubricating gaskets. When the self-lubricating gasket is used for a self-lubricating bearing, on the premise that the antifriction and abrasion resistance of the self-lubricating gasket is not affected, the resistance value change of the gasket on the bearing can be monitored, the abrasion loss of the gasket is monitored through the resistance value change, shutdown or equipment disassembly is not needed, the detection efficiency is improved, and the labor cost is reduced; errors caused by manual measurement are avoided, and the intelligent monitoring effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of self-lubricating bearings, and in particular to a self-lubricating liner capable of intelligently monitoring wear. Background Art

[0002] The pad-type self-lubricating bearing is formed by bonding and impregnating the self-lubricating fabric on the outer ring. It is widely used in the fields of aviation / engineering machinery, etc. The main failure form of the pad-type self-lubricating bearing is pad wear.

[0003] Self-lubricating fabric linings are mainly made by mixing and weaving polytetrafluoroethylene fibers with outstanding lubricating properties and high-performance reinforcing fibers, compounding them with a resin matrix, and then curing them under certain temperature and pressure conditions. High-performance reinforcing fibers are mainly divided into organic fibers and inorganic fibers. Organic fibers mainly include PBO fibers, aramid fibers, polyester fibers, and polyimide fibers; inorganic fibers mainly include glass fibers and basalt fibers. The resin matrix currently mainly uses two types of phenolic resins and polyimide resins with outstanding processing and wear resistance.

[0004] Among them, the interfacial adhesion between the fiber blended fabric and the resin matrix in the existing self-lubricating gasket is relatively weak, so the main failure mode of the self-lubricating fabric gasket is wear failure under the repeated friction of the mating pair.

[0005] At present, the wear detection method of liner-type self-lubricating bearings is usually to measure the wear by feeler gauge when the machine is stopped, or to measure the clearance after disassembly. Both detection methods need to be completed manually, which is time-consuming and has certain manual errors. In addition, the disassembly and installation of bearings may affect the normal operation of other parts of the equipment. With the development of intelligent equipment, intelligent requirements are put forward for the wear status monitoring of key motion nodes of equipment. Therefore, a liner that can intelligently monitor the wear amount is proposed. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a self-lubricating pad with intelligent wear monitoring, which can realize intelligent monitoring of the wear amount of the self-lubricating pad without affecting the friction reduction and wear resistance performance of the self-lubricating pad.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solution: it comprises a plurality of gaskets arranged around the circumference, the gaskets comprising a base, a wear-resistant layer and a monitoring part, one side of the base is adhered to the inner side of the outer ring of the bearing, the wear-resistant layer is arranged on the other side of the base, and an insulating layer is arranged between adjacent gaskets;

[0008] The monitoring part includes a conductive wear sheet and a resistance sensor, wherein the conductive wear sheet is embedded on a side surface of the substrate close to the wear-resistant layer, and the resistance sensor is arranged in the substrate, and the positive and negative wires of the resistance sensor pass through the substrate and the conductive wear sheet in sequence to the wear-resistant layer;

[0009] The substrate, the wear-resistant layer and the conductive wear sheet are all self-lubricating pads.

[0010] Furthermore, it also includes an elastic part, which includes an elastic member and a push rod. A limiting groove is provided in the base, the elastic member is arranged in the limiting groove and connected to the push rod, and the push rod is connected to the conductive wear sheet.

[0011] When the self-lubricating pad is in use, after the inner wear-resistant layer is worn, the conductive wear sheet on the surface of the base is exposed, and the elastic member pushes the conductive wear sheet to fit the outer surface of the inner ring of the bearing through the push rod. The resistance sensor can monitor the resistance changes of the wear-resistant layer, the conductive wear sheet and the base, thereby monitoring the overall wear of the self-lubricating pad.

[0012] The beneficial effect of the above-mentioned self-lubricating liner with intelligent wear monitoring is that when the wear-resistant layer and the conductive wear sheet are worn, the elastic part can maintain the fit with the inner ring of the bearing to avoid the gap that causes the bearing failure. At the same time, when wear begins to occur, the monitoring part can monitor the wear amount online in real time through the change of resistance value, thereby achieving the effect of intelligent monitoring and better monitoring the health status of the bearing.

[0013] Furthermore, the preparation method of the self-lubricating liner comprises the following steps:

[0014] S1: Degreasing the self-lubricating fabric;

[0015] S2: roughening the surface of the self-lubricating fabric after degreasing;

[0016] S3: In situ synthesis of conductive polyaniline on the roughened self-lubricating fabric surface;

[0017] S4: performing a secondary impregnation treatment on the self-lubricating fabric with in-situ synthesized conductive polyaniline, wherein the first impregnation liquid contains a conductive filler;

[0018] S5: curing the impregnated self-lubricating fabric at high temperature to obtain a self-lubricating liner with a conductive layer.

[0019] Furthermore, in step S4, the self-lubricating fabric of in-situ synthesized conductive polyaniline is subjected to a first impregnation treatment, specifically, conductive filler, phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 5-15%, 50-70%, 10-20% and 10-20% to obtain a first impregnation liquid, the self-lubricating fabric of in-situ synthesized conductive polyaniline is immersed in the first impregnation liquid, an ultrasonic vibration rod is added at the same time, ultrasonic vibration blending is performed, and the self-lubricating fabric after the first impregnation is obtained after curing.

[0020] Furthermore, the self-lubricating fabric after the first impregnation treatment is subjected to a second impregnation treatment, and phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 66%, 17% and 17% to obtain a second impregnation liquid. The self-lubricating fabric after the first impregnation treatment is immersed in the second impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the second impregnation is obtained after curing.

[0021] Furthermore, the conductive filler is one or more of graphite, graphene, carbon fiber or carbon nanotube.

[0022] Furthermore, the conductive filler in the self-lubricating liner of the wear-resistant layer is modified carbon nanotubes, and the modified carbon nanotubes are prepared by the following method: adding carbon nanotubes to an isopropanol solution, stirring evenly at 40-60°C and ultrasonicating to obtain a mixed solution; and drying the mixed solution at 80-100°C to obtain hydroxylated carbon nanotubes.

[0023] Furthermore, the self-lubricating liner of the wear-resistant layer also includes a wear-resistant filler, which is a modified boron nitride. The modified boron nitride is prepared by the following method: dispersing boron nitride in deionized water, then adding a silane coupling agent, reacting at 40-60°C for 4-6 hours, and after the reaction is completed, centrifuging, washing, and drying to obtain the modified boron nitride.

[0024] Wherein, the ratio of boron nitride to silane coupling agent is (5-15):1;

[0025] Wherein, the silane coupling agent is KH-560.

[0026] Furthermore, the self-lubricating fabric is made by weaving aramid fibers and polytetrafluoroethylene fibers.

[0027] In some specific embodiments, in step S1, the specific steps of degreasing the self-lubricating fabric are: soaking the self-lubricating fabric in an acetone solution to remove oil stains on the surface of the self-lubricating fabric, then washing the self-lubricating fabric in deionized water, and then drying it in a drying oven.

[0028] Furthermore, in step S2, the specific steps of roughening the surface of the self-lubricating fabric are as follows:

[0029] The self-lubricating fabric was placed in a sodium hydroxide solution, stirred in a water bath, and then washed with deionized water until the pH of the washing solution was ≈ 7, and then placed in a drying oven for drying.

[0030] Furthermore, in step S3, the specific steps of in-situ synthesizing conductive polyaniline on the surface of the conductive sheet are:

[0031] Aniline solution is added to sulfuric acid solution in a mass ratio of 1:2 to obtain a sulfuric acid solution containing aniline, and the roughened conductive sheet is immersed in the sulfuric acid solution containing aniline for ultrasonic adsorption.

[0032] Furthermore, an ammonium persulfate solution containing aniline is obtained in a mass ratio of ammonium persulfate to aniline solution of 2:1; the ammonium persulfate solution containing aniline is added dropwise into a sulfuric acid solution containing a conductive sheet and aniline, and after the reaction is completed, it is dried for 2 hours to obtain a self-lubricating liner with in-situ synthesized conductive polyaniline.

[0033] Furthermore, the self-lubricating liner of the substrate, the wear-resistant layer and the conductive wear sheet has different resistance values.

[0034] The beneficial effects of the above-mentioned self-lubricating liner with intelligent wear monitoring are:

[0035] 1) The self-lubricating pad in the present application can maintain the original wear resistance while also having the function of monitoring resistance by synthesizing conductive polyaniline in situ on the self-lubricating fabric and impregnating phenolic resin and phenolic resin containing conductive fillers at the same time. When it is used in a self-lubricating bearing, it can monitor the change of the resistance value of the pad on the bearing, and monitor the wear amount of the pad through the change of the resistance value, which does not require stopping or disassembling the equipment, improves the detection efficiency and reduces the labor cost, and avoids the error of manual measurement, achieving the effect of intelligent monitoring.

[0036] 2) The present application configures the self-lubricating pads of the base, the wear-resistant layer and the conductive wear sheet to have different resistance values, so that the self-lubricating pads in the present invention can judge the wear condition of the self-lubricating pads of each plate according to the change of the resistance value in the self-lubricating pad, thereby achieving a better monitoring effect.

[0037] 3) The wear-resistant layer and the conductive wear-resistant sheet in the present application are surface-modified by carbon nanotubes and boron nitride so that their surfaces have active groups such as hydroxyl and amino groups. At the same time, the carbon nanotubes have a certain adsorption effect, and the modified boron nitride can be stabilized on the surface of the carbon nanotubes by adsorption or bonding, which effectively reduces the stacking of boron nitride sheets, thereby allowing the wear-resistant filler to be evenly dispersed in the resin system; in addition, the modified hydroxylated carbon nanotubes and silanized boron nitride can be bonded or hydrogen-bonded with the hydroxymethyl functional groups in the phenolic resin and the amino matrix in the self-lubricating fabric of the in-situ synthesized conductive polyaniline to form a stable three-dimensional network structure, thereby having excellent wear resistance while being supplemented by the good conductive properties of the self-lubricating pad, thereby improving the service life of the self-lubricating pad for intelligent wear monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0039] Figure 1 A schematic diagram of a self-lubricating liner with intelligent wear monitoring provided by one embodiment of the present invention;

[0040] Reference numerals:

[0041] 1- pad, 2- insulation layer;

[0042] 10-substrate, 20-wear-resistant layer, 30-conductive wear sheet, 31-resistance sensor, 40-spring, 41-push rod. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0044] The present invention provides a general and / or specific description of the materials and test methods used in the experiment. The test methods or test methods involved are all conventional methods unless otherwise specified; the reagents or instruments used are all conventional products available on the market, prepared or used in a conventional manner, unless the manufacturer is specified.

[0045] In the following examples, the conductive filler used is carbon nanotubes with a specific surface area of ​​100-200 m 2 / g of single-walled carbon nanotubes; the heat-resistant filler used is boron nitride, and its particle size is 15-45μm; the self-lubricating fabric used is woven from aramid fibers and polytetrafluoroethylene fibers.

[0046] Example 1

[0047] The present invention provides a method for preparing a self-lubricating liner, comprising the following steps:

[0048] S1: Degreasing the self-lubricating fabric: soaking the self-lubricating fabric in an acetone solution to remove oil stains on the surface of the self-lubricating fabric, then washing the self-lubricating fabric in deionized water, and then drying the self-lubricating fabric in a drying oven;

[0049] S2: roughening the surface of the degreased self-lubricating fabric: placing the self-lubricating fabric in a sodium hydroxide solution, stirring it in a water bath, washing the self-lubricating fabric with deionized water until the pH of the washing solution is ≈ 7, and then drying it in a drying oven;

[0050] S3: In-situ synthesis of conductive polyaniline on the roughened self-lubricating fabric surface: first, adding aniline solution to sulfuric acid solution in a mass ratio of 1:2 to obtain a sulfuric acid solution containing aniline, and immersing the roughened conductive sheet in the sulfuric acid solution containing aniline for ultrasonic adsorption;

[0051] Then, the ammonium persulfate solution containing aniline is obtained in a mass ratio of ammonium persulfate to aniline solution of 2:1; the ammonium persulfate solution containing aniline is added dropwise into the sulfuric acid solution containing the conductive sheet and aniline, and after the reaction is completed, it is dried for 2 hours to obtain a self-lubricating fabric with in-situ synthesized conductive polyaniline;

[0052] S4: performing a secondary impregnation treatment on the self-lubricating fabric prepared by in-situ synthesizing conductive polyaniline, wherein the first impregnation liquid contains a conductive filler, wherein the conductive filler is a carbon nanotube;

[0053] The self-lubricating fabric of in-situ synthesized conductive polyaniline is subjected to a first impregnation treatment: specifically, carbon nanotubes, phenolic resin, ethyl acetate and alcohol are added according to a formula mass ratio to obtain a first impregnation liquid, the self-lubricating fabric of in-situ synthesized conductive polyaniline is immersed in the first impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the first impregnation is obtained after curing;

[0054] The proportions of the raw materials in the first impregnation liquid of the self-lubricating liner of the substrate are: 5% carbon nanotubes, 70% phenolic resin, 15% ethyl acetate, and 10% ethanol;

[0055] The ratio of each raw material in the first impregnation liquid of the self-lubricating liner of the wear-resistant layer is: 10% carbon nanotubes, 60% phenolic resin, 15% ethyl acetate, and 15% ethanol;

[0056] The ratio of each raw material in the first impregnation liquid of the self-lubricating liner of the conductive wear sheet is: 15% carbon nanotubes, 50% phenolic resin, 20% ethyl acetate, and 15% ethanol;

[0057] The self-lubricating fabric after the first impregnation treatment is subjected to a second impregnation treatment, and phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 66%, 17% and 17% to obtain a second impregnation liquid. The self-lubricating fabric after the first impregnation treatment is immersed in the second impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the second impregnation is obtained after curing.

[0058] S5: curing the impregnated self-lubricating fabric at high temperature to obtain a self-lubricating liner with a conductive layer.

[0059] Example 2

[0060] The present embodiment provides a method for preparing a self-lubricating liner with intelligent wear monitoring. The raw materials and proportions used are basically the same as those in Example 1, except that the conductive filler in the wear-resistant layer is replaced by modified carbon nanotubes.

[0061] The modified carbon nanotubes are prepared by the following modification method: adding carbon nanotubes to an isopropanol solution (immersing), stirring evenly at 50° C. and ultrasonicating to obtain a mixed solution; and drying the mixed solution at 90° C. to obtain hydroxylated carbon nanotubes.

[0062] Example 3

[0063] The present embodiment provides a method for preparing a self-lubricating liner for intelligent wear monitoring. The raw materials and proportions used are basically the same as those in Example 1, except that 8% of wear-resistant filler is added to the self-lubricating liner of the wear-resistant layer, specifically:

[0064] The ratio of each raw material in the first impregnation liquid of the self-lubricating liner of the wear-resistant layer is: 10% carbon nanotubes, 8% modified boron nitride, 60% phenolic resin, 12% ethyl acetate, and 10% ethanol;

[0065] The modified boron nitride used in the wear-resistant layer is modified by the following method:

[0066] Boron nitride was dispersed in deionized water, and then a silane coupling agent (KH-560) was added, wherein the mass ratio of boron nitride to silane coupling agent was 10:1, and the mixture was reacted at 50°C for 5 hours. After the reaction was completed, the mixture was centrifuged, washed, and dried to obtain modified boron nitride, wherein the particle size of the boron nitride was 15-45 μm.

[0067] Comparative Example 1

[0068] The preparation method of a self-lubricating liner with intelligent wear monitoring disclosed in this comparative example adopts the same raw materials and proportions as those in Example 1, and the method steps are basically the same as those in Example 1, except that in the impregnation process, ultrasonic vibration blending is not used, but the impregnation liquid is coated on the surface of the self-lubricating liner of in-situ synthesized conductive polyaniline by coating.

[0069] Comparative Example 2

[0070] The preparation method of a self-lubricating liner for intelligent wear monitoring disclosed in this comparative example is basically the same as that of Example 1, except that the conductive polyaniline is not synthesized in situ on the self-lubricating fabric. Specifically, the preparation method comprises the following steps:

[0071] S1: Degreasing the self-lubricating fabric: soaking the self-lubricating fabric in an acetone solution to remove oil stains on the surface of the self-lubricating fabric, then washing the self-lubricating fabric in deionized water, and then drying the self-lubricating fabric in a drying oven;

[0072] S2: roughening the surface of the degreased self-lubricating fabric: placing the self-lubricating fabric in a sodium hydroxide solution, stirring it in a water bath, washing the self-lubricating fabric with deionized water until the pH of the washing solution is ≈ 7, and then drying it in a drying oven;

[0073] S3: performing a second impregnation treatment on the roughened self-lubricating fabric, wherein the first impregnation liquid contains a conductive filler, wherein the conductive filler is a carbon nanotube;

[0074] The self-lubricating fabric of in-situ synthesized conductive polyaniline is subjected to a first impregnation treatment: specifically, carbon nanotubes, phenolic resin, ethyl acetate and alcohol are added according to a formula mass ratio to obtain a first impregnation liquid, the self-lubricating fabric of in-situ synthesized conductive polyaniline is immersed in the first impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the first impregnation is obtained after curing;

[0075] The proportions of the raw materials in the first impregnation liquid of the self-lubricating liner of the substrate are: 5% carbon nanotubes, 70% phenolic resin, 15% ethyl acetate, and 10% ethanol;

[0076] The ratio of each raw material in the first impregnation liquid of the self-lubricating liner of the wear-resistant layer is: 10% carbon nanotubes, 60% phenolic resin, 15% ethyl acetate, and 15% ethanol;

[0077] The ratio of each raw material in the first impregnation liquid of the self-lubricating liner of the conductive wear sheet is: 15% carbon nanotubes, 50% phenolic resin, 20% ethyl acetate, and 15% ethanol;

[0078] The self-lubricating fabric after the first impregnation treatment is subjected to a second impregnation treatment, and phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 66%, 17% and 17% to obtain a second impregnation liquid. The self-lubricating fabric after the first impregnation treatment is immersed in the second impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the second impregnation is obtained after curing.

[0079] S5: curing the impregnated self-lubricating fabric at high temperature to obtain a self-lubricating liner with a conductive layer.

[0080] Comparative Example 3

[0081] The preparation method of a self-lubricating liner with intelligent wear monitoring disclosed in this comparative example uses raw materials and proportions that are basically the same as those in Example 3, except that the boron nitride used is non-silanized boron nitride, and the method steps are the same as those in Example 3.

[0082] The self-lubricating liner with intelligent wear monitoring provided by the present invention is as follows Figure 1 As shown, it includes multiple groups of gaskets 1 arranged around the circumference, and the gaskets 1 include a base 10, a wear-resistant layer 20 and a monitoring part. One side of the base 10 is pasted on the inner side of the outer ring of the bearing, and the wear-resistant layer 20 is arranged on the other side of the base 10. An insulating layer 2 is arranged between adjacent gaskets 1. The monitoring part includes a conductive wear sheet 30 and a resistance sensor 31. The conductive wear sheet 30 is embedded on the surface of one side of the base 10 close to the wear-resistant layer 20. The resistance sensor 31 is arranged in the base 10, and the positive and negative wires of the resistance sensor 31 pass through the base 10 and the conductive wear sheet 30 to the wear-resistant layer 20 in sequence. The base 10, the wear-resistant layer 20 and the conductive wear sheet 30 are all self-lubricating gaskets, wherein the thickness of the base layer is 0.3mm, the thickness of the wear-resistant layer is 0.04mm, the thickness of the conductive wear sheet is 0.02mm, and they have different resistance values.

[0083] The self-lubricating pad also includes an elastic part, which includes an elastic member and a push rod 41. The elastic member is specifically a spring 40. A limiting groove is provided in the base 10. The spring 40 is arranged in the limiting groove and connected to the push rod 41. The push rod 41 is connected to the conductive wear sheet 30.

[0084] When the self-lubricating pad is in use, after the inner wear-resistant layer 20 and the wire are worn, the conductive wear sheet 30 on the surface of the base 10 is exposed. Under the action of the spring 40, the push rod 41 pushes the conductive wear sheet 30 to fit with the outer surface of the inner ring of the bearing to avoid gaps that cause bearing failure. After the wear begins, the resistance sensor 31 can monitor the resistance changes of the wear-resistant layer 20, the conductive wear sheet 30 and the base 10 online. Since the base 10, the wear-resistant layer 20 and the conductive wear sheet 30 have different resistances, after the wear-resistant layer 20 / the conductive wear sheet 30 are completely worn, the conductive wear sheet 30 / the base 10 begins to wear. This can achieve the effect of monitoring the wear of the self-lubricating pad as a whole and each part, realize the effect of intelligent monitoring, and better monitor the health status of the bearing.

[0085] Performance Testing

[0086] The present application conducts friction and wear performance tests on the self-lubricating pads with intelligent wear monitoring prepared in Examples 1-3 and Comparative Examples 1-3, specifically:

[0087] 1) Monitoring performance test

[0088] The self-lubricating liner is bonded to the lower sample of the screen display type high temperature material end face friction and wear testing machine, and the material of the lower sample is 45 steel.

[0089] The tribological performance of the self-lubricating pad was tested using a screen-displayed high-temperature material end face friction and wear tester at room temperature, a load of 1000N and a sliding speed of 0.36m / s. At the same time, the resistance change of the self-lubricating pad was measured in real time by a resistance sensor, and the wear scar depth of the self-lubricating pad was measured using a GFM wear meter. Taking Example 1 as an example, the change of the resistance of the prepared self-lubricating pad with the wear time as the wear progresses is shown in Table 1:

[0090] Table 1 shows the change in resistance of the self-lubricating pad in Example 1

[0091] Wear time(s) Resistance(kΩ) Wear depth(mm) 9200 620 0.01 38000 150 0.04 56000 1640 0.06

[0092] It can be seen from Table 1 that the change in resistance and wear depth of the self-lubricating pad of Example 1 show a strong correlation as the friction and wear test proceeds. In the early stage of wear, the specimen is in direct contact with the wear-resistant layer of the self-lubricating pad under the action of the load force, and the resistance is 620 kΩ at this time.

[0093] After 9200s, the resistance value dropped rapidly from about 620kΩ to about 150kΩ, and continued to drop steadily to about 38000s, indicating that as the surface wear-resistant layer peeled off, the specimen came into contact with the conductive wear sheet of the self-lubricating liner, resulting in a step-by-step decline in the resistance value;

[0094] As the wear progresses, the resistance value increases in the opposite direction to 1640kΩ after 56000s, indicating that the conductive wear sheet of the self-lubricating pad has peeled off. The user can judge that the self-lubricating pad has been worn to the corresponding layer (part) or even the base based on the change in resistance value, and alert the staff to replace and repair it.

[0095] 2) Wear resistance test

[0096] When the wear depth is the same, the wear time used is shown in Table 2, specifically:

[0097]

[0098]

[0099] It can be seen from the data in Table 2 that from Comparative Example 1 and Example 1, the self-lubricating gasket in the present application, after being treated by the impregnation + ultrasonic vibration method, can effectively improve the uniform mixing of the blended fiber, resin and filler, thereby greatly improving the wear resistance of the self-lubricating gasket;

[0100] From the comparison between Comparative Example 2 and Example 2, it can be seen that if the conductive polyaniline is not synthesized in situ on the surface of the blended fiber, the problem of poor adhesion between the blended fiber and the resin is likely to occur, affecting the wear resistance of the self-lubricating gasket; while by synthesizing the conductive polyaniline in situ on the surface of the blended fiber, technical support is provided for the self-lubricating gasket to have a conductive monitoring function while maintaining the original strength of the self-lubricating fabric.

[0101] From the comparison between Comparative Example 3 and Example 3, it can be seen that the surface modification of boron nitride allows the flaky boron nitride to be adsorbed or bonded to the surface of the carbon nanotubes, providing technical support for its uniform dispersion and bonding to the self-lubricating fabric of phenolic resin and in-situ synthesized conductive polyaniline, and providing technical support for improving the wear resistance of the self-lubricating liner.

[0102] By comparing Example 1, Example 2 and Example 3, it can be seen that the self-lubricating gasket in the present application is surface-modified by carbon nanotubes and boron nitride so that the surface has active groups such as hydroxyl and amino groups, and at the same time, the carbon nanotubes have a certain adsorption effect, and the modified boron nitride can be stabilized on the surface of the carbon nanotubes by adsorption or bonding, which effectively reduces the stacking of boron nitride flakes, thereby allowing the filler to be evenly dispersed in the resin system.

[0103] In addition, the modified hydroxylated carbon nanotubes and silanized boron nitride can form a stable three-dimensional network structure by bonding or hydrogen bonding with the hydroxymethyl functional groups in the phenolic resin and the amino matrix in the self-lubricating fabric of in-situ synthesized conductive polyaniline. In addition to the good conductive properties of the self-lubricating pad, it also has excellent wear resistance, thereby improving the service life of the self-lubricating pad with intelligent wear monitoring.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A self-lubricating liner with intelligent wear monitoring, characterized in that: It comprises a plurality of gaskets arranged around the circumference, wherein the gaskets comprise a base, a wear-resistant layer and a monitoring part, one side of the base is adhered to the inner side of the outer ring of the bearing, the wear-resistant layer is arranged on the other side of the base, and an insulating layer is arranged between adjacent gaskets; The monitoring part includes a conductive wear sheet and a resistance sensor, wherein the conductive wear sheet is embedded on a side surface of the substrate close to the wear-resistant layer, and the resistance sensor is arranged in the substrate, and the positive and negative wires of the resistance sensor pass through the substrate and the conductive wear sheet in sequence to the wear-resistant layer; The substrate, the wear-resistant layer and the conductive wear sheet are all self-lubricating pads.

2. The self-lubricating pad with intelligent wear monitoring according to claim 1, characterized in that: It also includes an elastic part, which includes an elastic member and a push rod. A limiting groove is provided in the base, the elastic member is arranged in the limiting groove and connected to the push rod, and the push rod is connected to the conductive wear sheet.

3. The self-lubricating pad with intelligent wear monitoring according to claim 1, characterized in that: The preparation method of the self-lubricating liner comprises the following steps: S1: Degreasing the self-lubricating fabric; S2: roughening the surface of the self-lubricating fabric after degreasing; S3: In situ synthesis of conductive polyaniline on the roughened self-lubricating fabric surface; S4: performing a secondary impregnation treatment on the self-lubricating fabric with in-situ synthesized conductive polyaniline, wherein the first impregnation liquid contains a conductive filler; S5: curing the impregnated self-lubricating fabric at high temperature to obtain a self-lubricating liner with a conductive layer.

4. The self-lubricating pad with intelligent wear monitoring according to claim 3, characterized in that: The step S4 of subjecting the self-lubricating fabric synthesized with conductive polyaniline in situ to a first impregnation treatment is specifically as follows: conductive filler, phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 5-15%, 50-70%, 10-20% and 10-20% to obtain a first impregnation liquid, the self-lubricating fabric synthesized with conductive polyaniline in situ is impregnated in the first impregnation liquid, an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the first impregnation is obtained after curing.

5. The self-lubricating pad with intelligent wear monitoring according to claim 4, characterized in that: The self-lubricating fabric after the first impregnation treatment is subjected to a second impregnation treatment, and phenolic resin, ethyl acetate and alcohol are added in a mass ratio of 66%, 17% and 17% to obtain a second impregnation liquid. The self-lubricating fabric after the first impregnation treatment is immersed in the second impregnation liquid, and an ultrasonic vibration rod is added to perform ultrasonic vibration blending, and the self-lubricating fabric after the second impregnation is obtained after curing.

6. The self-lubricating pad with intelligent wear monitoring according to claim 4, characterized in that: The conductive filler is one or more of graphite, graphene, carbon fiber or carbon nanotube.

7. The self-lubricating pad with intelligent wear monitoring according to claim 6, characterized in that: The conductive filler in the self-lubricating liner of the wear-resistant layer is modified carbon nanotubes, which are prepared by the following method: adding carbon nanotubes to an isopropanol solution, stirring evenly at 40-60°C and ultrasonicating to obtain a mixed solution; drying the mixed solution at 80-100°C to obtain hydroxylated carbon nanotubes.

8. The self-lubricating pad with intelligent wear monitoring according to claim 3, characterized in that: The self-lubricating liner of the wear-resistant layer also includes a wear-resistant filler, which is modified boron nitride. The modified boron nitride is prepared by the following method: dispersing boron nitride in deionized water, then adding a silane coupling agent, reacting at 40-60°C for 4-6 hours, and after the reaction is completed, centrifuging, washing, and drying to obtain the modified boron nitride.

9. The self-lubricating pad with intelligent wear monitoring according to claim 3, characterized in that: The self-lubricating fabric is made by weaving aramid fiber and polytetrafluoroethylene fiber.

10. The self-lubricating pad with intelligent wear monitoring according to any one of claims 1 to 9, characterized in that: The self-lubricating liner of the substrate, the wear-resistant layer and the conductive wear sheet has different resistance values.

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