A durable lubricating antifriction slide plate for bridge bearing

Abstract

A durable lubricating and friction-reducing sliding plate for bridge bearings is disclosed. The composite sliding plate is composed of a wear-resistant material and a slow-release friction-reducing material. The wear-resistant material is a non-metallic wear-resistant sliding plate molded from a polymer-based high-molecular material. Dents or grooves are formed on the surface of the non-metallic wear-resistant sliding plate, and the slow-release friction-reducing material is solidified within these depressions or grooves. The slow-release friction-reducing material is composed of a carrier material, an adsorbent material, a lubricating material, and a stabilizer. By weight percentage, the components in the slow-release friction-reducing material are: carrier material 30%~60%, adsorbent material 5%~20%, lubricating material 10%~40%, and stabilizer 10%~20%. This composite sliding plate features high pressure resistance, low friction coefficient, excellent wear resistance, and long effective lubrication time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of developing high polymer materials for bridge bearings, and particularly relates to a durable lubrication and friction reduction sliding plate for bridge bearings. BACKGROUND

[0002] The bridge bearing is a "joint" part connecting the bridge and the pier, and has the functions of bearing the load of the upper bridge structure of the bearing and sliding and rotating. The sliding and rotating functions of the bridge are realized through the bearing plane friction pair and the spherical friction pair. In order to reduce the friction resistance in the sliding and rotating process of the bridge, the bearing friction pair is composed of a non-metallic sliding plate and a metal mating surface with good surface finish, and silicon grease is applied between the non-metallic sliding plate and the metal mating surface as lubricating grease. At present, 5201-2 silicon grease is used for the bearing friction pair. The 5201-2 silicon grease is a paste, and the bearing rotation and sliding during use will cause extrusion, shearing and other effects on the silicon grease, resulting in the precipitation of base oil of the silicon grease. The heat and wind of the external environment will accelerate the volatilization and loss of the base oil. The abrasion and dust of the external environment mixed with the silicon grease will further accelerate the loss of the silicon grease. With the increase of the service life, the 5201 silicon grease will gradually harden due to the loss of the base oil and the mixing of impurities, and the lubrication effect of the silicon grease will be reduced or even lost. The friction resistance will increase when the bearing is driven to slide and rotate by the expansion and creep and deflection of the beam body, which will have a great adverse effect on the pier. At present, the design life of the domestic bridge bearing is consistent with the life of the bridge, and the effective lubrication time of the silicon grease in the bridge bearing is much lower than the design life of the bearing, so the long-term friction reduction of the bridge bearing cannot be realized.

[0003] The patent "ZL 201220725641.3 A railway bridge bearing with durable and wear-resistant ball type bearing" discloses a ball type bearing which can periodically supplement silicon grease, so as to realize the long-term friction reduction and wear resistance of the bearing. Although the ball type bearing can realize the long-term friction reduction and wear resistance of the bearing, the silicon grease needs to be supplemented many times during the life of the bearing, and a large amount of time, manpower, financial resources and materials need to be invested for each time of supplementing the silicon grease, which is not economical.

[0004] Therefore, it is necessary to develop a new type of composite sliding plate to realize the long-term friction reduction technology of the railway bridge bearing during the whole life cycle and improve the safety of the operation of the railway bridge bearing. SUMMARY

[0005] To solve the above technical problems, the present application provides a durable lubrication and friction reduction sliding plate for bridge bearings, which has the characteristics of strong pressure bearing capacity, small friction coefficient, excellent wear resistance and long effective lubrication time.

[0006] In order to achieve the above technical purpose, the technical scheme adopted is: a long-lasting lubrication friction-reducing slide plate for bridge support, the composite slide plate is composed of wear-resistant material and slow-release friction-reducing material, the wear-resistant material is a non-metal wear-resistant slide plate formed by polymer-based high molecular material, and the slow-release friction-reducing material is solidified in the pits or grooves on the surface of the non-metal wear-resistant slide plate;

[0007] The slow-release friction-reducing material is composed of carrier material, adsorbent material, lubricating material and stabilizer, and the proportion of each component in the slow-release friction-reducing material is as follows: carrier material 30% to 60%, adsorbent material 5% to 20%, lubricating material 10% to 40%, and stabilizer 10% to 20% by weight percentage.

[0008] Further, the carrier material is selected from small molecular weight polymers with a melting point lower than 120 DEG C, preferably polyethylene wax.

[0009] Further, the adsorbent material is selected from porous adsorbent materials, preferably one or both of graphite worm and graphene, and the graphite worm is preferred.

[0010] Further, the lubricating material is selected from lubricating oil, preferably silicon oil as the lubricating material.

[0011] Further, the viscosity of the selected lubricating oil is not greater than 200000 cst.

[0012] Further, the stabilizer is selected from polytetrafluoroethylene micro powder.

[0013] Further, the non-metal wear-resistant slide plate is a polytetrafluoroethylene slide plate, a modified ultra-high molecular weight polyethylene slide plate, a polymer-based fiber-reinforced composite material slide plate or a polyester type wear-resistant slide plate.

[0014] Further, the pits are at least one combination of spherical, cylindrical, cuboid, triangular or square.

[0015] Further, the grooves are at least one combination of long strip, wave or sawtooth.

[0016] Further, the proportion of the grooves or pits to the surface area of the non-metal wear-resistant plate is 10% to 25%.

[0017] The present application has the following beneficial effects:

[0018] (1) Long-acting slow-release lubricity. After mixing graphite worms, graphene and lubricating oil, graphite worms and graphene will adsorb silicone oil in the structure of graphite worms and graphene by their excellent adsorption performance. The slow-release lubricating material is uniformly dispersed in the slow-release lubricating material during preparation. During the operation of the support, with the progress of the friction process, the adsorbed lubricating oil in the graphite worms and graphene on the friction interface will be continuously released to form an oil film on the friction interface, playing a role in lubrication and friction reduction. In the entire life cycle of the support, the slow-release lubricating material is stored in the grooves and pits on the surface of the slide plate. The slow-release lubricating material in the grooves or pits will release the adsorbed lubricating oil on the friction interface during the entire life cycle of the support, thereby achieving long-acting slow-release lubrication effect.

[0019] (2) Small friction coefficient of slide plate. The slow-release lubricating material greatly reduces the friction coefficient of the slide plate. The lubricating oil in the slow-release lubricating material can form an oil film on the friction interface during the friction process, greatly reducing the friction coefficient of the slide plate. At the same time, graphite worms, polytetrafluoroethylene and polyethylene wax and other materials themselves have the effect of lubrication and friction reduction. Especially graphite worms and polytetrafluoroethylene, graphite worms have the self-lubricating effect of graphite, and polytetrafluoroethylene is the solid lubricating material with the smallest friction coefficient at present. During the friction process, the two will form a transfer film on the friction interface, which will play a role in reducing friction and lubrication together with the oil film formed by the lubricating oil in the slow-release lubricating material. The multiple lubrication and friction reduction methods work together to greatly reduce the friction resistance in the friction process and greatly reduce the friction coefficient.

[0020] (3) Better wear resistance of slide plate. The slow-release lubricating material is used to lubricate the wear-resistant slide plate. Due to the long-acting lubrication and friction reduction effect of the slow-release lubricating material, the friction force acting on the friction surface is smaller, and the shearing effect of the friction force on the wear-resistant slide plate is weakened, so the wear of the wear-resistant slide plate is greatly reduced during the friction process. Therefore, the composite slide plate has better wear resistance.

[0021] (4) Better storage stability. The slow-release lubricating material is prepared from polyethylene wax, polytetrafluoroethylene powder, graphite worms and other solid materials, and exists in the form of solid in the grooves or pits on the surface of the wear-resistant slide plate. The grooves or pits have good constraint performance for the slow-release lubricating material. The slow-release lubricating material exists in the form of solid and will not flow, avoiding the problem of loss of base oil in the current silicone grease lubrication, and having better storage stability.

[0022] (5) Stronger bearing capacity. The slow-release lubricating material exists in the form of solid in the grooves or pits on the surface of the wear-resistant slide plate, and the slow-release lubricating material is compounded with the slide plate material, which has better mechanical stability than lubricating grease or lubricating oil. The bearing area of the slide plate surface is increased, and the bearing capacity is stronger. Attached Figure Description

[0023] Figure 1 These are cross-sectional structural diagrams of Embodiments 1, 2, and 3 of this invention.

[0024] Figure 2 for Figure 1 A top-view structural diagram;

[0025] Figure 3 These are cross-sectional structural schematic diagrams of Embodiments 4 and 5 of the present invention.

[0026] Figure 4 for Figure 3 A top-view structural diagram;

[0027] Figure 5 This is a cross-sectional view of Embodiment 6 of the present invention.

[0028] Figure 6 for Figure 5 A top-view structural diagram;

[0029] Figure 7 This is a schematic diagram of the structure of Embodiment 7 of the present invention;

[0030] Figure 8 for Figure 7 A top-view structural diagram;

[0031] Figure 9 This is a schematic cross-sectional view of the slide plate with spherical recesses of the present invention.

[0032] Figure 10 for Figure 9 A top-view structural diagram;

[0033] Figure 11 This is a schematic cross-sectional view of the slide plate with triangular recesses according to the present invention.

[0034] Figure 12 for Figure 11 A top-view structural diagram;

[0035] In the picture: 1. Wear-resistant sliding plate, 2. Slow-release lubricating material. Detailed Implementation

[0036] A durable lubricating and friction-reducing sliding plate for bridge bearings, the composite sliding plate is composed of wear-resistant material and slow-release friction-reducing material. The wear-resistant material is a non-metallic wear-resistant sliding plate formed by polymer-based polymer material. Pits or grooves are opened on the surface of the non-metallic wear-resistant sliding plate, and the slow-release friction-reducing material is solidified in the pits or grooves on the surface of the non-metallic wear-resistant sliding plate.

[0037] The slow-release friction-reducing material is composed of carrier material, adsorbent material, lubricating material and stabilizer, and the proportion of each component in the slow-release friction-reducing material is as follows: carrier material 30-60%, adsorbent material 5-20%, lubricating material 10-40%, and stabilizer 10-20% by weight percentage.

[0038] The carrier material is selected from small molecular weight polymers with a melting point lower than 120 DEG C, preferably polyethylene wax.

[0039] The adsorbent material is selected from porous adsorbent material, preferably graphite worm and / or graphene.

[0040] The lubricating material is selected from lubricating oil, preferably dimethyl silicone oil or methyl phenyl silicone oil, and the viscosity of the lubricating oil is not more than 200000 cst.

[0041] The stabilizer is selected from polytetrafluoroethylene powder.

[0042] The friction coefficient of the prepared sliding plate is 0.01-0.06, the friction coefficient is small, and the lubrication life is greater than or equal to 80 years.

[0043] The non-metal wear-resistant sliding plate is a polytetrafluoroethylene sliding plate, a modified ultra-high molecular weight polyethylene sliding plate, a polymer-based fiber-reinforced composite sliding plate or a polyester heat-resistant wear-resistant sliding plate.

[0044] The recess is at least one combination of spherical, cylindrical, cuboid, triangular or square.

[0045] The groove is at least one combination of strip-shaped, wavy or zigzag-shaped, and the shape of the recess or groove does not affect the final experimental results.

[0046] The proportion of the groove or recess to the surface area of the non-metal wear-resistant plate is 10-25%.

[0047] The lubricating oil is dimethyl silicone oil or methyl phenyl silicone oil, and the kinematic viscosity thereof is not more than 200000 cst.

[0048] The slow-release friction-reducing material is prepared by melting and mixing graphite worm, graphene, lubricating oil, polytetrafluoroethylene powder and polyethylene wax, and the components of the slow-release friction-reducing material are as follows: polyethylene wax 30-60%, polytetrafluoroethylene powder 10-20%, graphite worm 5-20%, graphene 0-5%, and lubricating oil 10-40% by weight percentage.

[0049] A preparation method of a composite sliding plate for bridge support mainly comprises the following steps:

[0050] (1) mixing graphite worm, graphene and silicone oil:

[0051] Mix the graphite worm, graphene and silicone oil in a high-speed mixer in proportion, respectively, and then stand for more than 12 hours to make the graphite worm and graphene fully absorb the silicone oil;

[0052] (2) Mix the polytetrafluoroethylene with the lubricating oil mixture prepared in step (1) uniformly, and stand for more than 2 hours;

[0053] (3) Preparation of slow-release lubricating material

[0054] First melt the polyethylene wax at 110-130 DEG C, then add the mixture prepared in step (2) into the polyethylene wax melt, stir uniformly at high speed, and cool and solidify to obtain the slow-release lubricating material;

[0055] (4) Preparation of non-metal wear-resistant slide plate: prepare the non-metal wear-resistant slide plate with grooves or pits on the surface according to the requirements, and preheat the slide plate to 40-50 DEG C;

[0056] (5) Preparation of composite slide plate: inject the slow-release lubricating material prepared in step (3) into the grooves or pits on the surface of the non-metal wear-resistant slide plate in a melting or heated extrusion manner, and complete the preparation of the composite slide plate after the slow-release lubricating material solidifies.

[0057] The thickness of the slide plate is 4-12 mm.

[0058] Example 1

[0059] (1) Prepare the raw materials according to the proportions of 30% polyethylene wax, 20% graphite worm, 40% silicone oil and 10% polytetrafluoroethylene powder;

[0060] (2) Mix the graphite worm and silicone oil at high speed, stand for 24 hours, and then mix with the polytetrafluoroethylene powder, and stand for 2 hours;

[0061] (3) Melt the polyethylene wax at 115 DEG C, then stir the mixture prepared in step (2) and the polyethylene wax melt uniformly, and cool to obtain the slow-release lubricating material

[0062] (4) Preparation of non-metal wear-resistant slide plate: prepare the modified ultra-high molecular weight polyethylene slide plate with cylindrical pits on the surface according to the requirements, and preheat the slide plate to 40 DEG C;

[0063] (5) Preparation of composite slide plate: melt the slow-release lubricating material prepared in step (2) in a melting manner, and coat the melt into the cylindrical pits on the surface of the non-metal wear-resistant slide plate in step (4), and complete the preparation of the composite slide plate after the slow-release lubricating material solidifies.

[0064] Example 2

[0065] (1) Prepare raw materials according to the ratio of polyethylene wax 50%, graphite worm 20%, silicone oil 20%, and polytetrafluoroethylene powder 10%;

[0066] (2) Mix graphene and silicone oil at high speed, place for 24 h, and then mix with polytetrafluoroethylene powder, stand for 2 h;

[0067] (3) Melt the polyethylene wax at 120°C, then mix the mixture prepared in step (2) with the polyethylene wax melt, stir uniformly, and cool to obtain the slow-release lubricating material

[0068] (4) Non-metal wear-resistant slide plate preparation: prepare a modified ultra-high molecular weight polyethylene wear-resistant slide plate with a cylindrical recess on the surface according to the requirements, and preheat the slide plate to 40°C;

[0069] (5) Composite slide plate preparation: melt the slow-release lubricating material prepared in step (2) by melting, and apply the melt to the cylindrical recess on the surface of the non-metal wear-resistant slide plate in step (4). After the slow-release lubricating material solidifies, the composite slide plate is prepared.

[0070] Example 3

[0071] (1) Prepare raw materials according to the ratio of polyethylene wax 60%, graphite worm 20%, silicone oil 10%, and polytetrafluoroethylene powder 10%;

[0072] (2) Mix graphene and silicone oil at high speed, place for 24 h, and then mix with polytetrafluoroethylene powder, stand for 2 h;

[0073] (3) Melt the polyethylene wax at 125°C, then mix the mixture prepared in step (2) with the polyethylene wax melt, stir uniformly, and cool to obtain the slow-release lubricating material

[0074] (4) Non-metal wear-resistant slide plate preparation: prepare a modified ultra-high molecular weight polyethylene wear-resistant slide plate with a cylindrical recess on the surface according to the requirements, and preheat the slide plate to 40°C;

[0075] (5) Composite slide plate preparation: melt the slow-release lubricating material prepared in step (2) by melting, and apply the melt to the cylindrical recess on the surface of the non-metal wear-resistant slide plate in step (4). After the slow-release lubricating material solidifies, the composite slide plate is prepared.

[0076] Example 4

[0077] (1) Prepare raw materials according to the ratio of polyethylene wax 30%, graphite worm 20%, silicone oil 30%, and polytetrafluoroethylene powder 20%;

[0078] (2) Mix graphene and silicone oil at high speed, place for 24 h, and then mix with polytetrafluoroethylene powder, stand for 2 h;

[0079] (3) The polyethylene wax is melted at 115°C, and then the mixture prepared in step (2) is stirred uniformly with the polyethylene wax melt, and cooled to obtain the slow-release lubricating material

[0080] (4) Non-metal wear-resistant slide preparation: prepare a polymer-based fiber-reinforced composite slide with horizontal grooves on the surface according to requirements, and preheat the slide to 45°C;

[0081] (5) Composite slide preparation: melt the slow-release lubricating material prepared in step (2) in a molten manner, and apply the melt to the horizontal grooves on the surface of the non-metal wear-resistant slide in step (4), and complete the preparation of the composite slide after the slow-release lubricating material solidifies.

[0082] Example 5

[0083] (1) Prepare raw materials according to the ratio of 35% polyethylene wax, 20% graphite worm, 30% silicone oil, and 15% polytetrafluoroethylene powder;

[0084] (2) Mix the graphite worm and dimethyl silicone oil at high speed, and then mix with the polytetrafluoroethylene powder after standing for 24 hours, and stand for 2 hours;

[0085] (3) The polyethylene wax is melted at 120°C, and then the mixture prepared in step (2) is stirred uniformly with the polyethylene wax melt, and cooled to obtain the slow-release lubricating material

[0086] (4) Non-metal wear-resistant slide preparation: prepare a polyester wear-resistant slide with horizontal grooves on the surface according to requirements, and preheat the slide to 50°C;

[0087] (5) Composite slide preparation: melt the slow-release lubricating material prepared in step (2) in a molten manner, and apply the melt to the horizontal grooves on the surface of the non-metal wear-resistant slide in step (4), and complete the preparation of the composite slide after the slow-release lubricating material solidifies.

[0088] Example 6

[0089] (1) Prepare raw materials according to the ratio of 40% polyethylene wax, 5% graphite worm, 5% graphene, 40% silicone oil, and 10% polytetrafluoroethylene powder;

[0090] (2) Mix the graphite worm, graphene, and silicone oil at high speed, and then mix with the polytetrafluoroethylene powder after standing for 24 hours, and stand for 2 hours;

[0091] (3) The polyethylene wax is melted at 125°C, and then the mixture prepared in step (2) is stirred uniformly with the polyethylene wax melt, and cooled to obtain the slow-release lubricating material

[0092] (4) Non-metal wear-resistant slide plate preparation: prepare the polymer-based fiber-reinforced composite slide plate with wavy grooves on the surface according to the requirements, and preheat the slide plate to 50°C;

[0093] (5) Composite slide plate preparation: melt the slow-release lubricating material prepared in step (2) in a molten manner, apply the melt into the wavy grooves on the surface of the non-metal wear-resistant slide plate prepared in step (4), and complete the preparation of the composite slide plate after the slow-release lubricating material solidifies.

[0094] Example 7

[0095] 1) Prepare raw materials according to the ratio of 45% polyethylene wax, 5% graphite worm, 40% silicone oil, and 10% polytetrafluoroethylene powder;

[0096] (2) Mix the graphite worm and silicone oil at high speed, and then mix with the polytetrafluoroethylene powder after standing for 24 h, and stand for 2 h;

[0097] (3) Melt the polyethylene wax at 120°C, then mix the mixture prepared in step (2) with the polyethylene wax melt, stir uniformly, and cool to obtain the slow-release lubricating material

[0098] (4) Non-metal wear-resistant slide plate preparation: prepare the ultra-high molecular weight polyethylene slide plate with rectangular pits on the surface according to the requirements, and preheat the slide plate to 40°C;

[0099] (5) Composite slide plate preparation: melt the slow-release lubricating material prepared in step (2) in a molten manner, apply the melt into the rectangular pits on the surface of the non-metal wear-resistant slide plate prepared in step (4), and complete the preparation of the composite slide plate after the slow-release lubricating material solidifies.

[0100] The implementation effect is shown in Table 1:

[0101]

[0102] The composition of the three control groups (by weight percentage) is shown in Table 2:

[0103]

[0104] The implementation effect of the three control groups is shown in Table 3:

[0105]

[0106] Note (1): Comparing the control group 1 and 2, it can be seen that only changing the ratio of graphite worms and graphene, the friction coefficient and linear wear rate of the third group data of the control group 1 and 2 are lower than those of the first group data and the second group data of the control group 1 and 2, and it can be concluded that the combination of graphite worms and graphene can better combine with other materials and achieve better results. From the data of the control group 3, it can be seen that only changing the content of silicone oil, it can be seen that with the increase of the content of silicone oil, the friction coefficient and linear wear rate gradually decrease; from the data of the control group 4, it can be seen that with the increase of the content of polytetrafluoroethylene, the friction coefficient and linear wear rate of the friction pair also gradually decrease.

Claims

1. A long-lasting lubricated antifriction slide for bridge bearing, the long-lasting lubricated antifriction slide is a composite slide, the composite slide is composed of wear-resistant material and slow-release lubricating material, the wear-resistant material is a non-metallic wear-resistant slide formed by a polymer-based macromolecular material, and the long-lasting lubricated antifriction slide is characterized in that: The recesses or grooves are formed on the surface of the non-metal wear-resistant slide plate, the proportion of the recesses or grooves in the surface area of the non-metal wear-resistant slide plate is 10% to 25%, and the slow-release lubricating material is solidified in the recesses or grooves on the surface of the non-metal wear-resistant slide plate, so that the slow-release lubricating material is combined with the non-metal wear-resistant slide plate; ​ The slow-release lubricating material is composed of carrier material, adsorbing material, lubricating material and stabilizer, and the proportion of each component in the slow-release lubricating material is as follows: carrier material 30% to 60%, adsorbing material 5% to 20%, lubricating material 10% to 40%, and stabilizer 10% to 20% by weight percentage; The carrier material is selected from small-molecular-weight polymers such as polyethylene wax with a melting point lower than 120℃. The adsorbing material is selected from porous adsorbing materials, and the porous adsorbing material is graphite worm and graphene. The lubricating material is selected from silicon oil as lubricating oil, and the viscosity of the lubricating oil is not greater than 200000cst. The stabilizer is selected from polytetrafluoroethylene powder. The preparation method of the long-lasting lubricating antifriction slide plate for bridge supports mainly includes the following steps: (1) mixing graphite worm, graphene and silicon oil: According to the proportion, graphite worm, graphene and silicon oil are mixed uniformly in a high-speed mixer, and then are left to stand for more than 12 hours, so that the graphite worm and graphene completely adsorb the silicon oil; (2) mixing polytetrafluoroethylene with the lubricating oil mixture prepared in step (1) uniformly and leaving for more than 2 hours; (3) preparation of slow-release lubricating material The polyethylene wax is first melted at 110℃ to 130℃, then the mixture prepared in step (2) is added to the polyethylene wax melt, and is stirred uniformly at high speed, and is cooled and solidified to prepare the slow-release lubricating material: (4) preparation of non-metal wear-resistant slide plate: a non-metal wear-resistant slide plate with grooves or recesses on the surface is prepared according to the requirements, and the slide plate is preheated to 40 to 50℃; (5) preparation of composite slide plate: the slow-release lubricating material prepared in step (3) is injected into the grooves or recesses on the surface of the non-metal wear-resistant slide plate in a molten or heated extruded manner, and the preparation of the composite slide plate is completed after the slow-release lubricating material is solidified.

2. A long-lasting lubricated friction-reducing slide plate for bridge bearings as claimed in claim 1, characterized in that: In the entire life cycle of the support, the slow-release lubricating material is stored in the grooves and recesses on the surface of the slide plate, and the slow-release lubricating material in the grooves and recesses will release the adsorbed lubricating oil at the friction interface during the entire life cycle of the support.

3. The long-lasting lubricating antifriction slide plate for bridge supports according to claim 1, wherein the non-metal wear-resistant slide plate is a polytetrafluoroethylene slide plate, a modified ultra-high molecular weight polyethylene slide plate, a polymer-based fiber-reinforced composite material slide plate or a polyester type wear-resistant slide plate.

4. A long-lasting lubricated friction-reducing slide plate for bridge bearings as claimed in claim 1, characterized in that: The recesses are at least one combination of spherical, cylindrical, cuboid, triangular or square.

5. A long-lasting lubricated friction-reducing slide plate for bridge bearings as claimed in claim 1, characterized in that: The grooves are at least one combination of long strip, wave or zigzag.

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