328 results about "Dry friction" patented technology

The invention discloses a use monitoring method and system for a knife gate valve, and relates to the technical field of knife gate valve monitoring, and the method comprises the steps: integrating a multi-mode sensor array at the root of a valve rod of the knife gate valve, an adjacent region of a sealing surface and in a valve cavity flow channel, and collecting multi-source signals in real time; performing dynamic fusion processing on the multi-source signal, and determining a feature extraction algorithm combination based on the current valve rod temperature and historical working condition data to extract a sealing surface damage feature, a transmission chain wear feature and a particle impact feature; constructing a dynamic anomaly judgment model, updating a clustering boundary of a vibration and torque characteristic space in real time, and performing decoupling diagnosis on a sealing surface dry friction risk, thread clearance expansion and gear wear in combination with time-frequency domain fluctuation analysis of a gear meshing frequency harmonic attenuation rate and an angular acceleration; and generating a three-level maintenance strategy according to the diagnosis result, dynamically adjusting the output torque of the execution mechanism and optimizing the switching frequency of the valve.

The invention relates to the technical field of high polymer materials and preparation thereof, and discloses a wet anti-slip bionic friction pad on a glass surface, which is inspired by a micro-nano structure of toe pads of organisms such as tree frogs and long-horned grasshoppers with wet friction increasing characteristics, and a bulge array is added on the surface of a high-friction material, so that the friction coefficient of the friction pad is increased; the microstructure arrays can discharge a water film on the surface of the friction pad under the capillary action in a wet environment, and the effective contact area between solids is increased, so that the friction pad and a friction surface are always kept in a dry friction state, and stable friction force is ensured. The friction pad comprises a connecting layer, a supporting layer and a tail end protruding straight column array, a tail end contact layer is in a hexagonal straight column shape, the diameter of an inscribed circle of a hexagonal micro-column structure ranges from 5 micrometers to 5000 micrometers, column bodies are densely arranged in a hexagonal mode, the height of the column bodies ranges from 10 micrometers to 1500 micrometers, the tail ends of the column bodies are planes, the interval between every two column bodies ranges from 2 micrometers to 600 micrometers, and tight drainage grooves are formed.

The invention relates to the technical field of aero-engines, and discloses a dry friction damper multi-target robust optimization method considering multi-source uncertainty, and the method specifically comprises the following steps: 1, quantifying the uncertainty parameters of a dry friction damper; step 2, performing hyper-Latin cube (LHS) sampling on value ranges of geometric parameters and contact parameters caused by abrasion to obtain parameter combination sampling capable of expressing global characteristics in a global sample space; 3, calculating a corresponding nonlinear dynamic response by using a multi-dimensional harmonic balance method (MHBM) by using the nonlinear parameters obtained by sampling; by means of the mode of synchronously optimizing key design parameters of the friction-damping system, the optimal robustness design of the friction-damping system is allowed to be carried out under parameter uncertainty with the purpose of vibration reduction, the damping effect of the dry friction damper is improved, the Pareto optimal solution of the neural network is solved through the genetic algorithm, and the optimal stability of the friction-damping system is improved. Therefore, the multi-objective optimization is realized and the calculation efficiency is improved.

The invention belongs to the technical field of electric actuating mechanism testing, and particularly discloses a comprehensive testing device of an electric actuating mechanism, which comprises a base plate, an operation table is fixed at the top of the base plate, a first adjusting groove is formed in the top of the operation table close to the edge of one side, and a second adjusting groove is formed in the top of the base plate. A second adjusting block is slidably connected into the second adjusting groove, a fixing plate is fixed to the top of the second adjusting block, and an oil tank is fixed to the position, close to the edge of one side, of the top of the fixing plate. According to the invention, by arranging the adjusting assembly, the feedback assembly and the protection assembly, the maximum value of the torque during testing of electric equipment with different powers can be adjusted, and meanwhile, in the torque testing process of the electric equipment, when the torque of the electric equipment reaches the maximum value, the electric equipment operates normally, interference is prevented, and the testing efficiency is improved. Moreover, the contact part of the feedback assembly is protected during normal operation after the electric equipment is tested, and the contact part is prevented from being damaged by dry friction.

The invention belongs to the technical field of plunger sealing of high-pressure plunger pumps, and particularly relates to a high-pressure plunger pump plunger assembly self-compensation type abrasion-resistant sealing structure which comprises a high-pressure plunger pump body and an oil suction and outlet tank, the right end of the high-pressure plunger pump body is connected with the oil suction and outlet tank, and a fixing assembly is detachably installed at the right end of the interior of the high-pressure plunger pump body. And the right end of the fixing assembly communicates with the left end of the inner wall of the oil suction and outlet tank, a first sealing structure is detachably installed at the right end of the interior of the fixing assembly, and the high-pressure plunger pump main body is used for driving the first sealing structure to conduct fine opening and closing operation. The friction coefficient of the sealing structure is reduced, and the friction heat conductivity coefficient of the plunger assembly is reduced, so that the wear resistance of the sealing structure is improved, material aging caused by temperature rise is prevented, multiple times of self-compensation can be conducted on a wear gap, and then the durability of the sealing structure is greatly improved.

The invention provides a fuzzy uncertainty analysis method for dynamics optimization of a parallel mechanism containing a gap space, and belongs to the technical field of industrial robot modeling and optimization, and the method comprises the following steps: S1, building a spherical pair model containing a dry friction gap; and S2, according to constraint conditions of the spatial parallel mechanism containing the spherical pair dry friction gap, obtaining a dynamic model of the three-degree-of-freedom spatial parallel mechanism containing the spherical pair dry friction gap. S3, performing optimization according to the dynamic model of the spatial parallel mechanism; and S4, agenting the optimized data into the dynamic model of the mechanism, selecting fuzzy parameters, establishing a dynamic model of the spatial parallel mechanism containing the fuzzy parameters, and carrying out solution analysis. According to the method, the adverse effect of the dry friction gap on the dynamic characteristics of the mechanism can be improved, and the method is provided for predicting the influence of the fuzzy parameters of the mechanism on the dynamic characteristics of the mechanism.

The invention discloses a polymorphic graphite-carbide steel-based multiphase wear-resistant composite material and a preparation method and application thereof.The material is of a composite tissue structure of spheroidal graphite, three-dimensional coralline graphite, multiple carbides and a steel matrix, and the multiple carbides are M3C type carbides and MC type carbides. Comprising the core steps of component design, composite inoculant proportion design, smelting and inoculation treatment, subsequent heat treatment and the like, and is characterized in that synergistic precipitation of spheroidal graphite, three-dimensional coralline graphite and various and multi-size carbides is achieved through chemical component design and inoculation regulation and control; the invention further provides application of the material in high-impact, heavy-load or dry-friction working conditions of crushing or grinding equipment. The material provided by the invention has better comprehensive wear resistance under complex working conditions, has structural stability, impact resistance, lubricity and thermal stability, and has wide engineering application prospects in severe environments such as high impact, high load, dry friction and the like.

The utility model relates to the technical field of coating machines, and discloses a device for preventing dry friction of a scraper of a coating machine, which comprises a fixed plate, the bottom of the fixed plate is fixedly connected with supporting legs, the outer side of the fixed plate is fixedly connected with an air cylinder, and the output end of the air cylinder is fixedly connected with a movable plate. A connecting block is slidably connected to the middle of the movable plate, a bolt is slidably connected to the middle of the movable plate, the bolt is in threaded connection with the connecting block, and a mounting plate is fixedly connected to the side, away from the movable plate, of the connecting block. According to the device, water can be sprayed to the two sides of the scraper through the atomization nozzles by driving the water pump, then the scraper can be protected, the service life of the scraper can be prolonged, the circular gear can drive the rack, the limiting block and the sleeve shell to move through the driving motor, and the distance between the two atomization nozzles can be adjusted; and therefore, when the scraper acts on paper with different sizes, the lubricating work of the scraper can be ensured.

The invention discloses an engine valve guide pipe and a preparation process and application thereof, the valve guide pipe is formed by plating a working surface of a Fe-based alloy matrix by adopting a magnetron sputtering process, and the Fe-based alloy matrix consists of C, N, Co, Cr, Ni, W, Ti, Mn, Al, Cu, V, S, Mo, Mg, Nb, Si, a toughening and cutting additive, a solid lubricant, hard particles and the balance of Fe. The valve guide pipe is prepared through the technological processes of additive preparation, burdening and powder mixing, mold wall lubricating, warm-pressing forming, sintering, siphon copper infiltration, heat treatment, finish machining and magnetron sputtering of the transition layer and the functional plating layer, has excellent hardness and strength and high compactness and further has good corrosion resistance, high-temperature wear resistance and good machining performance, and the service life of the valve guide pipe is prolonged. And the lubricating oil is suitable for working condition requirements including but not limited to hydrogen, natural gas, LPG gas, oil-gas hybrid power, fuel oil engines and the like in environments of high temperature, dry friction, impact, gas corrosion and the like.

The utility model relates to the technical field of track lubrication, and discloses a lubricating track assembly which comprises a supporting piece, a driven wheel rotationally installed on one side of the supporting piece through a rotating shaft, a driving wheel rotationally installed on the other side of the supporting piece through a bearing, and a tooth block fixed to the surface of the driving wheel. By arranging a hollow oil guide plate, a wear-resistant contact piece and a second through hole, lubricating oil can be smeared on the surface of a tooth block of the driving wheel through the second through hole when the driving wheel rotates and drives the tooth block to rotate to pass through one side of the hollow oil guide plate; when the tooth block passes through one side of the wear-resistant contact piece, lubricating oil smeared on the surface of the tooth block is uniformly smeared on the surface of the crawler belt through the wear-resistant contact piece, and redundant lubricating oil is scraped off and is reserved on the surface of the second through hole, so that the surface of the driving wheel tooth block is lubricated; the problem that due to dry friction, the tooth blocks of the driving wheel can be greatly abraded after being used for a long time, and the tooth blocks are damaged is solved, the service life of the tooth blocks is relatively long, and the use cost is relatively reduced.

The invention belongs to the field of mechanical seals, and particularly relates to a low-rotating-speed dry friction mechanical seal and a detection method, the rotating speed range is 0.5-200 r / min, the low-rotating-speed dry friction mechanical seal comprises a mandrel, a spring seat, a spring, a moving ring seat, a moving ring, a static ring, a gland and the like, and the mandrel is located in a cavity and can rotate relative to the cavity; the spring seat and the movable ring seat are arranged on the mandrel, the spring seat and the mandrel are completely fixed, and the movable ring seat and the mandrel are fixed in the circumferential direction; the movable ring is arranged on the movable ring seat, and the movable ring and the movable ring seat are processed and fixed into a whole through a special process; the gland is positioned at the outer end of the cavity and is fixedly connected with the cavity through a bolt; the static ring is arranged in the gland and is circumferentially fixed with the gland; the end face of the moving ring and the end face of the static ring are attached to form a sealing face. The sealing effect of the structure is more reliable, and online detection, disassembly and maintenance of the structure are more convenient.

The invention relates to the technical field of hydraulic element testing, in particular to a high-pressure axial plunger pump bearing bush pair interface friction and oil film characteristic testing device. According to the device, 10-60 MPa adjustable oil pressure is provided through the hydraulic pipeline unit, the driving unit achieves power loading and friction monitoring through a servo motor and a torque sensor, the main body unit conveys high-pressure oil to a bearing bush contact face through an in-shaft cross-shaped oil duct structure to form a static pressure supporting oil film, and a micron-sized oil film sensor is integrated; the oil detection unit monitors oil parameters, and the signal acquisition and control unit performs closed-loop regulation on oil supply flow, motor rotating speed and swash plate load based on oil film thickness, torque and pressure signals. The method has the beneficial effects that 0.2 mu m-level oil film fracture identification is realized, the occurrence rate of dry friction is reduced by 82% through a cross-shaped oil duct in the shaft, and the oil film fluctuation rate lt is cooperatively controlled through multiple parameters; + / -3%, the safety interlocking mechanism responds abnormally within 0.3 s.

The invention relates to Ni3Al-based alloy powder for laser cladding of a copper alloy surface, a cladding layer and a preparation method of the Ni3Al-based alloy powder, belongs to the technical field of laser processing materials, and is used for solving at least one of the problems of poor abradability, low hardness, low interfacial shear strength and the like of an existing copper alloy cladding layer. The Ni3Al-based alloy powder comprises the following chemical components in percentage by mass: 6.6%-7.1% of Al, 3.0%-3.5% of C, 34.5%-37.5% of Cr, 0.041%-0.06% of B, less than or equal to 200ppm of O, less than or equal to 30ppm of N, less than or equal to 5ppm of H and the balance of Ni. By adopting the Cr7C3 reinforced Ni3Al-based alloy powder provided by the invention, a cladding layer which is compact in organization structure, high in bonding strength with a matrix and excellent in wear resistance can be directly prepared on the copper surface. Specifically, the average hardness of a cladding layer on the surface of the copper alloy is larger than or equal to 490 HV, the shear strength of an interface is larger than or equal to 350 MPa, and under the dry friction condition (point friction and opposite grinding materials are Si3N4), the room-temperature wear rate is smaller than or equal to 1.85 * 10 <-5 > mm < 3 > / (N.m), and the wear rate at the temperature of 300 DEG C is smaller than or equal to 2.00 * 10 <-5 > mm < 3 > / (N.m).

The invention belongs to the technical field of wind power generation equipment, and discloses a sliding bearing, a wind power main gear box and a wind turbine generator. The sliding bearing includes a sliding layer. The sliding layer is deposited on the surface of the first member. When the first component and the second component rotate relatively, a lubricating oil layer is formed between the sliding layer and the second component, and the lubricating oil layer serves as a lubricating film with certain bearing capacity and can separate the sliding layer from the solid surface of the second component, so that dry friction is converted into liquid friction among molecules in the lubricating oil layer; the friction coefficient between the sliding layer and the second component is remarkably reduced, and therefore abrasion between the sliding layer and the second component is reduced. The sliding bearing has the advantages of being small in size, light in weight and good in economical efficiency. The sliding layer is made of the wear-resistant material and is deposited on the first component, so that the sliding layer forms a high-hardness and wear-resistant coating on the surface of the first component, and the service life of the sliding bearing can be prolonged.

The utility model discloses high-pressure spraying equipment for dust treatment, which comprises a dust treatment high-pressure spraying equipment main body, a spray head height adjusting assembly is arranged in the dust treatment high-pressure spraying equipment main body, and the spray head height adjusting assembly comprises a lifting plate and a threaded rod main body. Lubricating discs are arranged on the upper portion and the lower portion of the lifting plate respectively, lubricating agents are smeared on the contact portions of the lubricating discs, the lubricating agents can form a layer of protective film on the surface, and therefore the lubricating effect is improved. And dry friction between contact parts is converted into internal friction between lubricant molecules, so that the friction force is reduced, the phenomena of abrasion and blockage are effectively avoided, and the service life of equipment is prolonged.

The invention provides a new energy heavy truck battery replacement collet locking structure, and belongs to the technical field of vehicle equipment, the new energy heavy truck battery replacement collet locking structure comprises a base, the base is fixedly connected with a plurality of shell assemblies, the shell assemblies are connected with driving assemblies, the new energy heavy truck battery replacement collet locking structure further comprises a locking assembly, and the locking assembly is used for fixing a battery box; the guide assembly is used for ensuring the movement stability of the locking assembly; the guide assembly has the beneficial effects that a double-positioning mechanism is formed through sliding fit of the sliding groove hole and the guide seat and embedded limiting of the guide plate and the guide groove, it is ensured that the telescopic track of the locking pin is accurate, deviation caused by vibration is avoided, and deformation of the locking component is prevented; the piston push plate is driven by means of movement of the locking assembly, so that lubricating grease is automatically released, full-range coverage is achieved through the flow guide groove and the containing groove, part loss caused by dry friction is reduced, and the service life is prolonged.

The invention discloses a novel nonlinear rubber steel wire rope composite vibration isolator, and relates to the field of vibration isolators, the novel nonlinear rubber steel wire rope composite vibration isolator comprises a lower clamping plate, an upper clamping plate, rubber and two groups of first steel wire ropes, and the tops and the bottoms of the two groups of first steel wire ropes are symmetrically mounted on the two sides of the upper clamping plate and the lower clamping plate; a gap is reserved between the rubber and the upper clamping plate. According to the novel non-linear rubber steel wire rope composite vibration isolator, when the amplitude of a crystal oscillator is small, vibration energy can be absorbed and dissipated through dry friction damping between the first steel wire ropes, the lower clamping plate, the first steel wire ropes, rubber and the upper clamping plate can generate large dynamic displacement, strong impact can be attenuated, and the vibration isolation effect is good. Meanwhile, a large amount of low-frequency and high-frequency vibration is absorbed and dissipated, and due to the fact that a steel wire rope vibration isolator is small in friction damping and poor in vibration isolation effect during resonance, under the large-amplitude condition, the overall elastic support can be enhanced through the arranged rubber.

The invention provides a vision-variable binocular eyeball mechanism, and relates to the field of robot mechanisms, the vision-variable binocular eyeball mechanism comprises a base and an eyeball mounting seat arranged on the base; two eyeball body modules are movably arranged on the eyeball mounting seat, each eyeball body module comprises an industrial camera, a main movement track and an auxiliary movement track, the main movement track and the auxiliary movement track are arranged on the eyeball body module, and the main movement track and the auxiliary movement track are arranged in a space orthogonal mode; each eyeball body module is correspondingly provided with a driving module; the driving module drives the first driving sliding block and the second driving sliding block to move, so that independent rotation of the eyeball body module in the pitching direction and the yawing direction is achieved. The robot has the beneficial effects that the steering engines are intensively fixed to the base, and a second-stage movable platform is not needed; the bushing is used as a sliding bearing set for dry friction to replace a rolling bearing, so that the structure is simplified; the modular design is adopted, parts are convenient to produce, and assembling is facilitated.

The utility model discloses a variable-friction self-resetting SMA damper, and belongs to the field of concrete building structures. According to the variable-friction self-resetting SMA damper, the vertical baffle, the first friction plate, the push-pull rod, the second friction plate, the friction plate, the SMA rod, the limiting device and the multiple friction sliding devices are arranged, so that the whole device can drive the friction sliding devices to move through the push-pull rod, and then the SMA rod is stretched; the friction force can be increased along with the increase of the external load, the SMA bars are always in a tension state no matter whether the structure is pulled or pressed, the tension resistance of the SMA bars can be fully exerted, and therefore the overall anti-seismic performance of the structure is improved.

The invention relates to a mechanical sealing structure for a high-pressure pump, which is applied to the field of mechanical sealing for pumps and comprises a pump shell, a push spring is mounted in the pump shell, a push ring is connected to the tail end of the push spring, a movable ring is connected to the surface of the push ring, a static ring is mounted in the pump shell, and a plurality of strip-shaped grooves are formed in the surface of the movable ring. An adjusting assembly is mounted in the strip-shaped groove and comprises a telescopic cylinder, a movable part is slidably connected to the inner bottom wall of the telescopic cylinder, a wedge-shaped block is fixed to the inner wall of one end of the strip-shaped groove, an adjusting groove is formed in the surface of the movable part, a sliding block is slidably connected to the interior of the adjusting groove, and a power assembly is mounted on the side, close to the top end, of the movable part; the problem of dry friction of a traditional mechanical seal in the low-speed starting stage is effectively solved through a dynamic adjusting mechanism composed of the adjusting assembly and the power assembly, the balancing weight can be separated from the wedge-shaped block through the first micro electric push rod, and therefore the leakage situation caused by the too thick liquid film is reduced.

The utility model relates to the technical field of scraper conveyors, and discloses a wear-resistant scraper conveyor middle trough which comprises two side plates, a middle plate is fixedly connected between the middle ends of the two side plates, and a sound insulation plate is fixedly embedded in the middle plate. According to the wear-resistant scraper conveyor middle trough, the rolling columns are arranged on the bottom plate, so that a chain can be supported when the chain returns, the direct friction pressure between the chain and the bottom plate is effectively reduced, the overall wear resistance is greatly improved, and the service life of equipment is remarkably prolonged; the lubricating system conveys lubricating liquid in a water tank into a spray pipe through a pump body, and then the lubricating liquid is sprayed to the surface of the middle plate by a nozzle at a downward inclined angle. By means of the design, it is ensured that the middle plate can continuously obtain a proper amount of stable lubricating liquid in the working process, dry friction and additional abrasion caused by insufficient lubrication are effectively avoided, and meanwhile high-temperature coal gangue or coal briquettes can be cooled.

The invention discloses a wet clutch sliding friction state prediction method based on friction pair fluid-solid heat behavior calculation and a vehicle, and the method comprises the steps: carrying out the iterative calculation of the internal fluid-solid pressure, oil film thickness and rough contact area of a friction pair based on the structure and working condition parameters of a wet clutch through a fluid-solid bearing equation, and representing the fluid-solid coupling behavior of a friction gap; a heat-source-input-free heat balance equation and a contact temperature continuity equation are established in combination with physical property parameters, the sliding friction interface heat flow dynamic distribution proportion is calculated at the same time, and a wet clutch temperature field prediction model is established by superposing heat conduction characteristics; through a non-dominated sorting genetic algorithm, clutch dry friction test data and a rough torque model considering radial temperature difference are fused, a rough friction coefficient-temperature fitting equation is solved, and a temperature field prediction model is combined to achieve updating of rough friction coefficients under different thermal load characteristics; and rough torque and viscous torque are respectively solved by integrating fluid-solid heat behaviors of the wet clutch, and the rough torque and the viscous torque and the temperature field jointly represent the sliding friction state of the wet clutch.

The invention provides a low-friction high-wear-resistance resin-based composite material as well as a preparation method and application thereof, and belongs to the field of composite materials. The polyphenylene sulfide-based composite material is prepared from radiation-modified polytetrafluoroethylene nano-powder, graphite nano-powder, molybdenum disulfide nano-powder and other inorganic filler particles in a certain compounding ratio. The composite material shows excellent tribological performance, and on the basis, by adding short carbon fibers and other reinforcing fillers and utilizing a multi-scale functional filler network structure built in the composite material, preparation of the high-strength, low-friction and high-wear-resistance polyphenylene sulfide-based composite material is achieved. The method is simple in technical process route and low in manufacturing cost, can be used for preparing friction protection parts, low-friction wear-resistant structures, wear-resistant bearings, self-lubricating parts, mechanical gaskets and other parts used under dry friction, and has very wide application prospects in the fields of aerospace, traffic transportation, electronic devices, high-end mechanical equipment and the like.

The invention discloses a wear-resistant manganese brass alloy material and a processing method thereof, and relates to the technical field of alloy materials, the wear-resistant manganese brass alloy material comprises the following components by weight: 24%-34% of zinc, 1.5%-3% of manganese, 0.3%-2% of aluminum, 0.3%-1.8% of tin, 0.3%-1.2% of nickel, 0.03%-0.15% of rare earth element cerium, and the balance of copper and inevitable impurities, the wear-resistant manganese brass alloy material is prepared by the preparation method of the wear-resistant manganese brass alloy material. Comprising the following steps: (1) smelting: preheating a medium-frequency induction furnace to 280-380 DEG C, adding a copper block, heating to 1020-1120 DEG C to melt the copper block, sequentially adding zinc, manganese and nickel, stirring for 3-10 minutes after each element is added, then cooling to 920-1020 DEG C, adding aluminum, tin and cerium, and stirring for 8-20 minutes; after the rare earth elements are added into the components of the wear-resistant manganese brass alloy material, the tensile strength and the Brinell hardness value of the prepared wear-resistant manganese brass alloy are remarkably improved, the dry friction coefficient and the wet friction coefficient are remarkably reduced, and the wear-resistant manganese brass alloy shows good wear resistance.

The invention discloses a martensite reinforced self-lubricating copper-based alloy coating and a laser cladding preparation method thereof, the martensite reinforced self-lubricating copper-based alloy coating comprises the following components in percentage by mass: 66 to 84 weight percent of Cu, 10 to 20 weight percent of Al, 3 to 10 weight percent of Ni, 3 to 10 weight percent of Mn, 0 to 2 weight percent of Sn and 0 to 2 weight percent of Pb. In the preparation process, the laser input energy density is controlled within the range of 8.96-13.27 J / mm, and the double strengthening effects of grain refinement and martensite content increase can be synchronously achieved. The main phase structure of the obtained coating is twin-crystal martensite, meanwhile, the coating contains a small amount of alpha-Cu lubricating phase, gamma phase and Fe-rich hard phase, and the dry friction coefficient of the coating is 1t; 0.35, and the solidification hardness gt; and the voltage is 350HV. Compared with the existing self-lubricating tin-based babbitt metal and copper-tin alloy with similar friction coefficients, the coating disclosed by the invention realizes synergistic improvement of high hardness and low friction performance, and is particularly suitable for dynamic friction and wear working conditions with higher impact resistance requirements, such as robot motion joints, precision mechanical transmission parts and the like.

To provide a dry friction material which can be produced more easily than conventional ones, a production method for the dry friction material, a composition for a dry friction material, and a method for producing the composition.SOLUTION: A dry friction material 1 includes a matrix material 11 and a dispersed material 12, the matrix material 11 including a vulcanized rubber, the dispersed material 12 including heat-resistant reinforcing fibers 121 and a friction regulation material, and the heat-resistant reinforcing fibers 121 being oriented in a certain direction. This composition for a dry friction material is formed by extruding a kneaded mixture of an unvulcanized rubber, heat-resistant reinforcing fibers, and a friction regulation material. A production method for this composition for a dry friction material includes an extrusion step of extruding a kneaded mixture of an unvulcanized rubber, heat-resistant reinforcing fibers, and a friction regulation material.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of rail vehicle engineering, and discloses a simulation calculation method for accurately calculating train dynamic curve passing, which comprises the following steps of: establishing a longitudinal-transverse-vertical interaction heavy haul train-rail three-dimensional coupling dynamics refined model; nonlinear links (such as axle box suspension nonlinearity, center plate contact nonlinearity, wedge friction nonlinearity, coupler gap impact effect and dry friction nonlinearity, buffer nonlinear hysteresis impedance and the like) of locomotive suspension and the multi-parameter continuous change characteristic of a curve track are fully considered. If the coupler is used as an independent rigid part for modeling, analyzing the actual coupling and vibration characteristics of the coupler; in combination with the gas flow theory, an air braking model is further improved, and the influence of a train marshalling form on braking wave distribution and braking wave transmission, the influence of distribution of braking force and brake shoe pressure in the braking process on the vehicle wheel-rail power effect and the like can be considered.

The invention relates to a glass insulator with a protection function, and belongs to the technical field of insulators, conditional starting of a cleaning assembly is realized through a wind power triggering assembly, an elastic reset part controls engagement or disengagement of a pawl part and a ratchet wheel under the action of wind power, and when the wind power is small, the elastic reset part cannot generate enough displacement, so that the cleaning assembly is cleaned. The pawl part is separated from the ratchet wheel, and the ratchet wheel idles and the cleaning assembly is kept static, so that the surface abrasion of the insulator body caused by continuous dry friction in small wind is avoided; when wind power is large, the elastic reset part moves to enable the pawl part to be meshed with the ratchet wheel, the ratchet wheel drives the annular rotating part to rotate in one direction, the cleaning assembly is driven to conduct cleaning, and the problem that in the stable strong wind and fixed wind direction environment, the cleaning efficiency is low due to wind power changes in a wind-driven self-cleaning scheme is solved; and the problems of insulator abrasion and mechanical fatigue are also caused.

The bearing closing-in device comprises a closing-in device body, oil injection tanks are fixedly installed on the two sides of the top of the closing-in device body, push rods are fixedly installed on the two sides of the top of an inner cavity of each oil injection tank, a supporting plate is fixedly installed at the output end of each push rod, and a pressurizing plate is fixedly installed at the bottom of each supporting plate through a support. An oil bag is fixedly installed at the bottom of an inner cavity of the oil injection box, and one side of the oil bag communicates with a spray head through a pipeline. According to the technical scheme, the problems that an existing bearing closing-in device does not have an automatic oil injection function, lubricating grease or lubricating oil needs to be regularly and manually supplemented, especially under the severe working conditions of high load, high temperature, high dust and the like, the oil injection period can be shortened to be once per day or per shift, manual operation consumes time and labor, the labor cost of enterprises is increased, and the working efficiency is high are solved. If oil is not injected in time due to negligence or scheduling problems, the temperature of the bearing closing-in device can be rapidly increased due to dry friction, and the problems of surface abrasion, gluing and even locking are caused.

The utility model discloses a road roller press roll device capable of reducing noise and improving efficiency, which comprises an outer cylinder part and an inner cylinder part, and the inner cylinder part is positioned at the central position of the outer cylinder part; end covers are arranged at the two ends of the outer cylinder part, center hole positions are formed in the end covers, an inner cavity of the outer cylinder part is sealed by the end covers, the inner cylinder part is arranged in the center hole positions in a matched mode, and liquid inlets are formed in the end covers. The hollow inner cavity of the compression roller device is filled with lubricating oil, so that the weight of the compression roller device is increased, the compression roller device can make a depressed sound in the rolling process, and noise generated in construction can be reduced; the lubricating oil can lubricate the bearing between the horizontal fulcrum shaft and the center hole position of the compression roller device while increasing the weight of the compression roller device, and the situation that normal work and rest, work and study of local residents are affected due to noise generated by dry friction between movably matched parts is avoided.