303results about How to "Reduce friction noise" patented technology

The nanometer vibration-reducing and noise-reducing self repairing material is prepared with nanometer level metal powder and natural ore powder as main material and through adding several kinds of supplementary material and certain technological process, and is added into lubricating oil or ultrasonic medium as high performance repair material. The present invention features that the high performance repair material can create high hardness self-repairing lubricating film fast on the surface of metal friction pairs to regulate the interval of the friction pair, reduce friction coefficient, raise bearing capacity, leveling the friction surface, reduce vibration and noise caused by the unbalance, friction and damage of the moving machine parts, and prolong the service life of the machine parts. The present invention may be used widely in improving performance of mechanical friction parts.

The invention discloses an inner detection system for submarine pipelines and a detection method thereof. The inner detection system comprises an electronic sealed cabin arranged in a supporting frame. The supporting frame is provided with a supporting roller array, an odometer wheel, a pressure sensor, a temperature sensor and a sound sensor, wherein the supporting roller array, the odometer wheel, the pressure sensor, the temperature sensor and the sound sensor are distributed in an annular mode. The detection method includes: the inner detection system is connected to an upper computer to download signals collected by the sensors, and filtering and noise reduction processing is performed on the signals; traveling mileage of the inner detection system and included angles of the axis of the inner detection system and a local geomagnetic field and local gravitational acceleration are calculated at any time t, and a direction vector of the axis of the inner detection system is obtained through the included angles; the position of the inner detection system at any time is obtained; and whether leakage exists is judged through comparison of processed sound signals, pressure signals and temperature signals, and leakage rate is estimated. The inner detection system for submarine pipelines and the detection method of the inner detection system achieve detection of little leakage, improve detection accuracy, reduce detection difficulty and cost, and shorten detection period.

Noise can be effectively reduced without rotative power transmission accuracy being compromised.

In a tooth 2 of a resin gear 1, a tooth face that is a predetermined area from a tooth crest 8 towards a tooth root 10 side serves as a tooth profile modification area 11. A tooth surface excluding the tooth profile modification area 11 serves as an involute profile area 12. The tooth profile modification area 11 includes a linear standard profile portion 14 formed by an involute curved line from the tooth crest 8 of the tooth towards the tooth root 10 side and a profile modification portion 16 in which a tooth thickness gradually and smoothly decreases from the standard profile portion 14 along a tooth width direction and the tooth thickness gradually and smoothly decreases from a tooth root end side 15 towards the tooth crest 8. In the tooth profile modification area 11, a contacting section becomes elastically deformed as a result of the resin gear coming into contact with a meshing mating gear. A tooth width direction length of the contact surface gradually increases from a minute, point-like width to a full tooth width from the tooth crest 8 side towards the tooth root 10 side.

A sheet conveying apparatus includes: a sheet conveyance path designed so as to include nonlinear portions; a first conveyance roller pair which is provided at predetermined positions of the sheet conveyance path and which has a conveyance width capable of nipping and conveying a sheet having the minimum size sheet passing width among sheets to be passed through the sheet conveying apparatus; a guide plate which is placed in a downstream side or an upstream side of the first conveyance roller pair in a sheet conveyance direction and has a curved guide surface; and a plurality of guide ribs which are extended on the guide surface in the sheet conveyance direction and are provided in a sheet passing width direction of the sheet in a region corresponding to the conveyance width of the first conveyance roller pair.

The invention discloses a self-adaption rail car. The car comprises two front wheels capable of rolling front and back and rotating horizontally and provided with sensors, guide devices connected with the front wheels to facilitate turning of the car, and two rear wheels for self-adaption to the rail deformation; the rear wheels are driven by a power mechanism; and the rear wheels and the power mechanism are mounted on a rotating bearing of a car body. Compared with the prior art, the self-adaption rail car has the following advantages: when the car provided with the sensors, the front wheel guide devices and the car body rotating bearing walks on rails, the rotating bearing can be controlled to drive the rear wheels to rotate by a certain angles according to induction signals of the sensors to a curve limiting switch when the car enters a curve, so that low-speed smooth passing of the car in small-radius curve is realized. When the wheels are suspended and the car is stopped at rail deformation sections, identification signals obtained after detecting the front wheels by the front wheel sensors can be matched with a PLC to start a rear wheel self-adaption device, so that the car passes through the deformation rail sections, and normal walking of the car is realized.

The invention relates to a rotatable lift car toe guard, solving the problem that the retractable toe guard in the prior art is easy to be damaged upon collision with the ground and possibly cannot be returned in place. The lift car toe guard comprises an upper toe guard piece and a lower toe guard piece articulated to each other, wherein a stop rod mechanism rotating along with the downward movement of the lift is arranged on the upper toe guard piece; a cam coaxially connected with the stop rod mechanism is further arranged on the upper toe guard piece; and a link mechanism capable of pulling the lower toe guard piece for turnover along with the rotation of the cam is arranged on the cam. The design of the stop rod mechanism, the cam and the link mechanism of the toe guard provided by the invention realizes transformation from rotation to linear movement so that the toe guard rotates at a certain angle; in this way, the demand for the depth of the foundation pit is reduced; the toe guard does not need to collide with the ground surface of the foundation pit; and damage on the toe guard and accidental harm on people are avoided.

The invention provides a grinding unit for a high speed train and a preparation method of the grinding unit. The grinding unit is composed of a friction material and a steel backing, wherein the friction material is composed of phenolic resins having specific physical properties, reinforced fibers, fillers and the like; the components of the friction material need to be pretreated such as mixing and drying; the steel backing needs to be pretreated such as abrasive blasting and resin glue spraying; the pretreated friction material and steel backing are subjected to special hot press molding, heat treatment and other processes, thereby obtaining the grinding unit. According to the grinding unit disclosed by the invention, by improving the thermal stability and enhancing the shock strength, the performance of the grinding unit in aspects such as metal inlaying, crack chipping, wheel shaping, friction noise and the like are improved, damage to the wheel tread is small, the phenomena such as hot cracks and severe wave furrowed abrasion are difficultly caused, and the grinding unit has important application value and wide market prospects in the field of high-speed trains.

The invention relates to a dust removal device for a grinding wheel cutting machine, and is used for solving the problems of dust and noise pollution of the grinding wheel cutting machine. The technical scheme is as follows: the dust removal device for the grinding wheel cutting machine comprises a protective cover, an ash suction fan, a dust collection pipe, an ash collection cavity and a dust cleaning tank, wherein the ash suction fan is positioned at the top of the protective cover and is communicated with the protective cover, and the ash suction fan is communicated with the dust collection pipe; an outlet end of the dust collection pipe reaches the ash collection chamber, and the dust cleaning tank is positioned at the lower part of the dust collection pipe; silencer pipes are arranged in the ash collection chamber and are uniformly distributed around the dust collection pipe, and the upper ends of the silencer pipes are higher than the outlet end of the dust collection pipe; and the lower ends of the silencer pipes penetrate through a bottom plate of the ash collection chamber and reach water in the ash cleaning tank. The dust removal device has the advantages that the dust removal and noise reduction are integrated, the intrusion of dust pollution to operators can be avoided, the production site is purified, and the adverse affect of dust on other equipment in a workshop is prevented, and meanwhile, the friction noise generated by the grinding wheel cutting machine is greatly reduced. The trial shows that the dust removal effect is excellent and the environmental protection and noise reduction effects are obvious.

A linear actuator using a metal beam-type piezoelectric material, and an apparatus and a method for actuating the same. The piezoelectric actuator includes: a moving member having a predetermined length and moving in a forward or a backward direction; and a piezoelectric portion contacting the moving member and moving the moving member linearly using a vibration generated when a piezoelectric element contracts or expands in response to an electrical signal.

The invention provides a preparation method of a composite frictional material. The preparation method comprises the following steps that 1, a ferrous-based powder metallurgical frictional material is prepared; 2, shearing, smashing and screening are performed; 3, material mixing is performed; 4, the composite frictional material is prepared; 5 posttreatment is performed; 6, the composite frictional material is machined. Compared with the prior art, the composite frictional material integrates the characteristics of high temperature resistance and low abrasion resistance of the ferrous-based powder metallurgical frictional material and the characteristics of good toughness and low hardness of a resin-based composite material and has the advantages of high temperature resistance, low abrasion resistance, good toughness and low hardness. The ferrous-based powder metallurgical frictional material is used for preparing an automobile braking accessory, scratching of an automobile brake disc or drum is effectively avoided based on good braking performance, and frictional noise is small.

The invention discloses a flange friction type shape memory alloy rod self-restoring steel frame beam-edge column joint. The flange friction type shape memory alloy rod self-restoring steel frame beam-edge column joint comprises a steel column, a steel beam, a shape memory alloy rod, an L-shaped bracket, a shear plate and a friction energy dissipater, wherein the steel beam is located on one side of the steel column, the shape memory alloy rod transversely penetrates through the steel column, the L-shaped bracket is located at the inner side of a steel beam flange, the shear plate is located in the middle position of a steel beam web plate, and the friction energy dissipater is located at the outer side the steel beam flange; the friction energy dissipater comprises a steel plate, an energy-dissipation friction sheet and high-strength bolts, wherein the steel plate is arranged at the outer side of the steel beam flange, the position between the steel plate and the steel beam flange is filled with the energy-dissipation friction sheet, and the high-strength bolts penetrate the steel beam flange to connect the steel plate, the energy-dissipation friction sheet and the L-shaped bracket. According to the flange friction type shape memory alloy rod self-restoring steel frame beam-edge column joint, the stable energy-dissipation capacity of the joint can be improved significantly, and the self-restoring performance of the joint is achieved at the same time by utilizing super elasticity of shape memory alloy; and convenience of floor arrangement of the position of the joint and replaceability of components are improved, and the ability of resisting local buckling deformity of the steel beam flange is strengthened by reasonable designing for the joint structure.

The invention discloses an anti-attrition spacer capable of reducing frictional abnormal sound and an application of the anti-attrition spacer and belongs to the field of mechanical parts. The anti-attrition spacer takes a low-carbon alloy cold-rolled sheet as a base body, and carbonitriding thermal treatment and surface coating treatment of a polyfluorocomplex and/or a nylon 11 coating are successively performed on the low-carbon alloy cold-rolled sheet. The adhesive force between the coating and the base body in the anti-attrition spacer provided by the invention is large, and the coating has excellent anti-attrition effect and wear-resistant effect. The anti-attrition spacer is used between contact surfaces which rub with each other. With prolonging of frictional time, the coating on the anti-attrition spacer does not fall off, so that the durability of the anti-attrition spacer is ensured, the frictional coefficient between the anti-attrition spacer and the contact surfaces is effectively reduced, and the adhesive wear is reduced, and therefore, the frictional abnormal sound is further reduced. In particular, the anti-attrition spacer used in the field of automobiles can effectively relieve the frictional abnormal sound generated between the end face of a universal joint at the fixed end of a driving shaft and a contact surface of a hub bearing of an automobile.

The invention relates to a hard framework guide slot top strip. The hard framework guide slot top strip comprises a hard framework guide slot top strip body with an opening in the lateral direction, a first upper clamping part and a second upper clamping part. The first upper clamping part and the second upper clamping part are located on the top face of the hard framework guide slot top strip body and are parallel to the axial direction of the hard framework guide slot top strip body. The first upper clamping part is located on the sealed side of the hard framework guide slot top strip body and is a semi-solid-rubber semi-sponge-rubber lip. The part, facing the open side, of the lip is made of solid rubber, and the part, opposite to the open side, of the lip is made of sponge rubber. The second upper clamping part is located on the open side of the hard framework guide slot top strip body and is a fin-shaped hollow sponge foam pipe parallel to the axial direction of the hard framework guide slot top strip body. Due to the design, abnormal friction sounds generated by connection of the top strip structure and a vehicle body in the vehicle running process are reduced, air noise is lowered, and the sealing performance of a system without a first sealing strip is achieved.

The invention relates to a preparation method for an alloy sample surface wear-resisting protective layer. Firstly, an alloy sample is subject to micro-arc oxidation treatment, and a multi-hole micro-arc oxidation layer is obtained on the alloy sample surface; and secondly, a sealant is applied to the alloy sample surface. According to the preparation method, through the technologies of micro-arcoxidation, sealant applying and the like, an even micro-arc oxidation layer and lubrication particle composite self-lubricating wear-resistant coating is prepared on the alloy sample surface, the characteristic that micropores and lubrication particles are organically bonded is effectively used, and the antiseptic, wear-resisting and lubricating properties are greatly improved.

The invention provides a friction particle which can be prepared by the following methods of: 1) preparing the following materials in percent by mass: 55-73% of grinding dust, 1-3% of phenolic resin, 15-20% of liquid butyronitrile rubber and 7-22% of a first tribological property conditioning agent; and (2) uniformly mixing the materials in proportion, feeding the mixed materials into an internal mixer to be refined for 5-8 minutes, wherein the refining temperature is 80-100 DEG C, and cooling the refined material blocks and crushing so as to obtain the friction particle. The invention further provides a friction material and friction goods with the friction particle. The friction material and friction goods prepared from the friction particle have the advantages of low corrosion loss, high strength, low hardness, low noise and the like.

The invention relates to a rubber noise-reduction wear-resistant road brick and a preparation method thereof, belonging to the technical field of building materials. The invention provides a rubber noise-reduction wear-resistant road brick and a preparation method thereof, wherein the method comprises the steps of: evenly mixing 10wt%-15wt% cement, 5.0wt%-10.0wt% of pulverized fuel ash, 50wt%-70wt% of broken stones and 0.12wt%-0.8wt% of rubber powder and a proper amount of water, so as to obtain a mixture in a semi-dry state for die-filling; then evenly mixing 3.0wt%-5.0wt% of white cement, 7.0wt%-12wt% of quartz sand, 0.08wt%-0.4wt% of rubber powder, more than or equal to 0.4wt% of pigment and a proper amount of water, so as to obtain a mixture in a semi-dry state for die-filling; and washing the rubber powder in advance by adopting water and alkali solution, shaping in a jolt-squeeze manner and carrying out maintenance to obtain the rubber noise-reduction wear-resistant road brick. The method is simple, the road brick has the advantages of good compressive strength, wear resistance property, impact resistance property and noise reduction effect.

The invention relates to a thread transmission type electronic expansion valve, and belongs to valves. An existing electronic expansion valve is large in running noise, and abrasion or clamping of a magnetic steel sleeve is prone to occurrence; the thread transmission type electronic expansion valve is characterized in that a backward step end face leaning shoulder is arranged on the outer circle face of a front base sleeve, the opening end of a back base sleeve is in butt joint with the step end face leaning shoulder in a fixedly welding manner to form a straight-cylinder-shaped shell with two ends closed, a front section of a nut sleeve is inserted into an inner cavity wall of the front base sleeve, and an end face leaning shoulder on the inner cavity wall and an inward turning edge of the opening end of the front base sleeve are used for limiting and fixing; a valve is installed in a hollow inner cavity of a valve rod sleeve fixed to the magnetic steel sleeve in a penetrating manner, the back end of the valve extends out of the back end of the magnetic steel sleeve, and a spacer bush and a spring arranged outside the valve rod in a sleeving manner are used for back stroke limiting; and the valve rod sleeve is matched with inner threads in an axial through hole of the nut sleeve through outer threads to drive the valve rod to move, a buffer connecting piece connected with the front end of the valve rod is arranged on the front section of the axial through hole of the nut sleeve to conduct guide supporting on the valve rod, circumferential limiting protrusions and limiting leaning shoulders which are matched with each other are arranged for front stroke limiting, and the collision noise and friction are reduced.

It solves the complex structure and difficult processing of the existing seal device for the bearings of cooling drive device for vehicles. With major shaft and belt wheels on the cooling drive device, this seal device is set at the end face of the belt wheel, comprises a seal washer embedded outside the seal cover on the major shaft, said seal cover fixed with the inner ring of the bearing and the major shaft, seal washer fastening with the belt wheel, seal cover and seal washer locking with each other with the gaps forming into a labyrinth seal. It has fine anti dust and water proof performance with reduced friction noise and heat. It is convenient for loading and unloading with low cost.

A conveyor apparatus including a main conveyor by which mail items are routed by being nipped between a transport belt and a main belt, and a secondary conveyor towards which the mail items are routed, after switching, along a secondary belt. The main and secondary belts performing the main conveying and the secondary conveying functions are constituted by a single, common belt that is twisted twice. The twice-twisted belt is engaged over a tensioner pulley that is a floating pulley.

The invention relates to a guide rail sliding block device and a machining technology thereof. The guide rail sliding block device and the machining technology thereof are designed aiming at solving the technical problems that the structural design of bearings and guide rails in existing guide rail sliding block devices of the same kind is poor, the noise is large, and the stability is poor. The guide rail sliding block device comprises a sliding block, a guide rail and a sliding block bearing. The guide rail sliding block device is characterized in that a sliding groove of the outer ring of the sliding block bearing is provided with a gluing layer, a polyurethane material is adopted in the glue layer, and the glue layer is integrally formed with the outer ring; the machining technology of the outer ring comprises the steps that the sliding groove is formed in the manufactured molded outer ring, heat treatment is conducted, and sand blasting, groove milling, molding, injection molding, groove lathing and groove grinding are conducted on the sliding groove of the outer ring to obtain the finished product outer ring; a reserved pre-polymer is adopted in the injection molded gluing layer, and the reserved pre-polymer is machined through heating and stirring chain-extending of the pre-polymer and MOCA. Meanwhile, the guide rail is integrally molded by aluminum alloy; and the guide rail sliding block device is good in stability, long in service life, low in friction noise, feasible in machining method, and suitable for sewing machine equipment like an embroidery machine and a quilting machine and sliding rails with the same kind application requirements.