49results about How to "Low coefficient of sliding friction" patented technology

An oily electro-magnetism vertical type semi-continuous casting process for a magnesium alloy ingot blank and a crystallizer are disclosed. The crystallizer comprises a metal liner, a cooling system, an excitation winding, a splash ring and a cover gas ring. The metal liner is disposed at the center of crystallizer. A cavity cooling system is disposed out of the metal liner. The excitation winding is disposed at the lower part in the cooling water cavity. A splash ring is disposed at the upper edge of the crystallizer liner. A cover gas ring is disposed above the splash ring. The invented method comprises following steps: coating a thin layer of lubricant oil on the inner wall of the metal liner, starting the crystallizer cooling system; then starting the low frequency generation power source to supply low frequency alternating current to the excitation winding; inducing the magnesium alloy fluid into the shunting disk disposed in the center of the liner; opening the cover gas ring; starting the casting machine and adjusting the crystallizer liquid level to be stable after the magnesium alloy fluid fills the top of the dummy ingot head; enlarging the cooling water flow, opening and adjusting control valve for controlling the splash ring. The invented proves can improve the surface quality of the magnesium alloy ingot blank, reduce surface turning quantity thereof, and increase casting speed thereof.

The invention discloses a construction support device and a construction method for a bridge adjacent to a business line. The construction support device for the bridge adjacent to the business line comprises a middle support (81) used for supporting the middle of the bridge, a side support group used for supporting the side face portion of the bridge and a disc buckle frame (84) arranged on the side support group and used for supporting a template on the side face portion of the bridge. The construction support device for the bridge adjacent to the business line realizes supporting for the template on the side face portion of the supported bridge through the disc buckle frame (84), realizes supporting for the middle of the supported bridge through the middle support (81), and realizes moving for the bridge through the side support group, thereby realizing construction for the bridge far away from an existing rail traffic business line, and improving construction efficiency of the bridge.

The invention discloses a wear-resistant PTFE composite material. The wear-resistant PTFE composite material is characterized by being prepared from the following components in percent by mass: 60-77%of PTFE, 5-10% of carbon fibers, 6-10% of glass fibers, 10-13% of graphite and 2-7% of molybdenum disulfide. The design balances the mechanical properties and friction property of the material, improves the wear resistance of the material to the maximum extent while reducing the tensile performance to the minimum extent, reduces the sliding friction coefficient of the product and improves the dimensional stability of the product effectively and prolongs the service life effectively. The formula is suitable for a sealing part which is good in wear resistance and bearing capacity or a frictionstructural part needing to reciprocate, so that the friction noise can be reduced, the grinding amount entering a circulating region is reduced, and the risk of strain breakage in assembly and use isreduced.

The invention discloses an unmanned aerial vehicle real-time tension detection device and a detection method thereof, and belongs to the technical field of force measurement. The unmanned aerial vehicle real-time tension detection device comprises a first fixed sleeve, a second fixed sleeve, an installing base, a motor fixing seat, a tension sensor, a motor, a vibration reduction spring and a propeller, wherein the motor and the propeller are fixed on the motor fixing seat; the first fixing sleeve is connected with a machine body; the second fixing sleeve is internally sleeved or externally sleeved onto the first fixing sleeve and is provided with a position limiting device in the axial direction; the motor fixing seat and the second fixing sleeve are in rigid connection; meanwhile, the motor fixing seat is connected with one end of the tension sensor through the vibration reduction spring; the other end of the tension sensor is fixed on the installing base; the installing base is fixed onto the machine body. The non-circular sleeve type design is used, so that the reverse twisting force generated when the motor and the propeller work can be counteracted; the free movement can be performed in the tension direction; the tension detection function is realized.

The invention relates to a particle-stabilized nanometer emulsion lubricant for water-based drilling fluids, and a preparation method thereof, wherein the particle-stabilized nanometer emulsion lubricant comprises 30-60% of fatty acids and ester derivatives thereof, 5-25% of a nonionic surfactant, 10-20% of a cationic surfactant, 5-20% of a solid lubricant, and 15-40% of water. According to the present invention, the particle-stabilized nanometer emulsion lubricant has good dispersibility in water-based drilling fluids, can overcome the disadvantages of difficult dispersion and easy oil phaseprecipitation of mineral oil or vegetable oil or other conventional liquid lubricants, can form the stable adsorption film on drill bits, drilling rods and well walls, can effectively reduce the friction coefficient of the friction surface, improve the lubrication performance and reduce the wear, and further can maintain good lubrication performance under extreme pressure or high load.

The invention provides a frictional sliding seat. The frictional sliding seat comprises a first molding plate and a second molding plate which are arranged in separation, and a sliding block structure which is arranged between the first molding plate and the second molding plate. The first molding plate is provided with a first frictional face. The second molding plate is provided with a second frictional face. The first frictional face and the second frictional face are arranged in opposition. The sliding block structure is provided with a first sliding face and a second sliding face which are oppositely arranged. Both of the first sliding face and the second sliding face are provided with a plurality of lubricating blocks. The lubricating blocks of the first sliding face are contacted with the first frictional face when being installed. The lubricating blocks of the second sliding face are contacted with the second frictional face.

The invention discloses a long-life type water-glycol fire-resistant hydraulic fluid. The long-life type water-glycol fire-resistant hydraulic fluid is characterized by comprising the following main materials by mass: 30-40 parts of water, 35-45 parts of glycol, 10-20 parts of tackifier, 3-10 parts of lubricant, 0.6-1.8 parts of composite corrosion inhibitor, 0.05-0.2 part of chelating agent, 0.002-0.005 part of anti-foaming agent, and 0.001-0.002 part of coloring agent; the lubricant is fatty acid amine salt, and the composite corrosion inhibitor is a mixture of mercaptobenzothiazole, sodiummolybdate and methylbenzotriazole. The long-life type water-glycol fire-resistant hydraulic fluid is excellent in stability, has a good lubricating property and a long service life, comprehensively balances the various performances of the fire-resistant hydraulic fluid, meets the actual use requirement of hydraulic equipment, and is particularly suitable for the use requirement of the hydraulic equipment under the high temperature and open fire accessible working environment.

The invention discloses a spherical swing device for a large rotary forging press. The spherical swing device comprises a fixing seat, driving gear boxes and an oil motor. The driving gear boxes are fixed at the top of the fixing seat, and are fixedly connected with an angle-deflected sleeve spindle set inside the fixing seat through a long driving bond and a connecting tray, a swing spindle is located at the center of the angle-deflected sleeve spindle set, a ball head and a swing head are arranged at the lower end of the swing spindle, and rotational connection is achieved through cooperation of the ball head and a ball bowl. A high molecular wear-resistant layer is arranged on the surface of the ball bowl, one oil supply hole extending from the outside to a contact surface of the ball head and the ball bowl is formed the ball bowl, and an oil receiver with an annular groove is fixed at the bottom of the ball wall along a contact circle of the ball bowl head through bolts. The spherical swing device for the large rotary forging press has the advantages that the angle-deflected sleeve spindle set has a function of floating compensation, so that clearance self-compensation after spherical pairs are slightly worn can be achieved; the oil supply hole formed in a ball bowl body serves as a forced lubrication cooling oil channel, so that friction is greatly reduced, and reliability of operation of a large-tonnage rotary forging press is guaranteed.

The invention provides double-layer composite fabric and a production method and use thereof. The composite fabric comprises a polytetrafluoroethylene filament fabric layer and an other fiber fabric layer. The warp yarn density of the polytetrafluoroethylene filament fabric layer is 70-360/inch and the covering coefficient of the polytetrafluoroethylene filament fabric layer is 1500-2800; the average roughness of center lines of the surface of the polytetrafluoroethylene filament fabric layer is below 15[mu]m; the number of defects on the surface of the composite fabric is less than 30 every 100m<2>. The double-layer composite fabric has the advantages of fewer defects, low sliding friction coefficient, and durable wear resistance and the characteristics of simple process and low cost and can be applied to mechanical movement parts of sliding bearings.

The drawing frame especially for a ring spinning frame has at least two sets of drawing frame cylinders and the apron band for guiding a fiber. A guide means (4, 41) acts so as to guide and slide the apron band (2, 21, 22, 23). Simultaneously, a combination of materials having little friction with the apron band (2, 21, 22, 23) is aimed at. In an advantageous practical embodiment, the apron band (2, 21, 22, 23) can have an additional part engaging with a notch of a shaft (3), and the apron band (2, 21, 22, 23) can be pressed to the driven shaft (3) by a pressing roll.

The invention provides an optical grating ruling engine indexing system macro-positioning executing mechanism adopting an ultrasonic friction-reduction technology. The optical grating ruling engine indexing system macro-positioning executing mechanism comprises a lead screw shaft, a nut in threaded fit with the lead screw shaft, a pulling rod assembly fixedly connected with the nut, and an ultrasonic vibrator assembly; and the ultrasonic vibrator assembly comprises an ultrasonic vibrator fixed to the nut and a driving module connected with the ultrasonic vibrator, and the ultrasonic vibrator vibrates under the effect of the driving module to reduce friction between the nut and the lead screw shaft. According to the optical grating ruling engine indexing system macro-positioning executing mechanism adopting the ultrasonic friction-reduction technology, the creeping phenomenon can be eliminated, the positioning precision of the macro-positioning link is improved, and the control difficulty of a whole indexing system is significantly lowered.

A bearing frame (1) or a cylinder head cover (2) for an internal combustion engine (3) may include at least one camshaft (4) mounted in tunnel bearings in at least two bearing openings (5) arranged along a bearing channel and completely enclosing at least one of the camshaft (4) and a radial bearing, and at least one axial shaft bearing ring (6) arranged on the camshaft (4). The axial shaft bearing ring (6) may have a ring groove (7) which is open towards the bearing frame (1) or towards the cylinder head cover (2). At least one engagement element (8) may be arranged on the bearing frame (1) or on the cylinder head cover (2), which engagement element (8) may engage into the ring groove (7) and forms an axial bearing (10) for the camshaft (4).