4911 results about "Brake" patented technology

The invention includes an unbalanced horizontal blind with a spring means to provide a lifting or retraction force for the slats of the blinds. A brake means prevents undesired movement of the slats that would otherwise result from the continuous retraction force of the spring means when the slats are set in a desired position. Controls for the release of the brake means and tilting are also provided in an embodiment of a blind of the invention. An embodiment of the invention permits the blind to be operated by a single wand that can be used to either raise the slats or tilt the slats. This eliminates the need for a loose cord or bead chain that would traditionally be used as the user interface for controlling the movement of the slats of the blind.

Disclosed is a roll-up blind with safety arrangement. The blind comprises a headrail, a brake mechanism proximate the headrail, a cord having one end passed the brake mechanism to form an operable portion, a shade cloth coupled to the headrail, the shade cloth having a lower end coupled to the other end of the cord, and a plurality of cord covers formed on the shade cloth to cover the other end of the cord. Whereby pulling the operable portion of the cord will cause the shade cloth to wrinkle upwardly and the cord covers to contract together. Most importantly, a dangerous ring will not be formed by the cord and the cord covers in operation. Also, the shade cloth is wrinkled upwardly and the cord covers are contracted together to form aesthetic members in response to drawing up.

The invention relates to an urban rail operation vehicle and in particular relates to a straddle type monorail operation vehicle with a structure comprising two pairs of wheels. The straddle type monorail operation vehicle comprises a carriage, a steering frame, an engine, a transfer case and a walking pump, wherein the steering frame is connected with an underframe of the carriage through a central pin dragging device; the steering frame comprises a framework, a secondary suspension device and a dragging device; the overall framework is of an II-shaped full-steel installed and welded plate type box structure and comprises a side beam, end beams connected to two ends of the upper part of the side beam and two vertical beams which are connected between the end beams; a motor bracket is fixed between the upper part of the side beam and the corresponding vertical beam; two independently-driven walking wheel assemblies are mounted on two motor brackets; four guide wheel assemblies are mounted on two sides of the middle part of the side beam; two stabilizing wheel assemblies are mounted on two sides of the lower part; the secondary suspension device adopts a secondary steel coil spring assembly. The straddle type monorail operation vehicle can reasonably meet the circuit requirements of monorail PC beams and is high in safety coefficient, excellent in dragging performance, simple and compact in structure, easy to maintain, stable in running and excellent in brake performance.

The invention discloses a machining tool and a machining method of a steering knuckle bearing hole. The tool comprises a fixture; the fixture includes a baseplate, a positioning shaft, a support part, a peripheral positioning clamping device, an auxiliary pressing device and a pressing device; the auxiliary pressing device is arranged in a tool magazine of a machining center; and a cutter clamping device on a main shaft of the machining center is used for automatically clamping to press on a steering knuckle to be machined in the fixture. The invention further designs the machining method corresponding to the tool. The tool and the method realize high-precision and high-efficiency machining of the steering knuckle bearing hole, integrate machining of a fender fixed hole end surface, a brake mounting hole end surface, an ABS mounting surface and a hole, reduce the clamping times, save the time, and improve the efficiency.

A hinge for pivotally interconnecting first and second brackets includes a shaft having a shaft body extending through the first and second brackets and formed with an engaging end portion proximate to the second bracket, a fixing member connected to the engaging end portion, a ratchet sleeved rotatably on the shaft body between the fixing member and the second bracket, a friction mechanism having an urging unit sleeved on the shaft body between the ratchet and the fixing member and pressing the ratchet toward the second bracket, and a brake mechanism disposed on the second bracket and having a pawl member releasably engaged to the ratchet.

A caster includes a casing having a shank and a locking unit is located at a lower end of the shank. Two wheels are connected to two sides of the casing by a shaft and an inner gear is connected to each of the two wheels. A direction unit is located in the casing and includes a first lever and an opening, the first lever connects the direction unit to the locking unit. A brake unit is located in the casing and includes a second lever. The second lever connects the brake unit to the locking unit and the inner gears. The second lever is engaged with the opening of the first lever and shares a common pivot with the first lever so as to respectively brake the caster and control direction of the caster.

The invention relates to a high performance and low cost C/C-SiC composite brake disc, a preparation method and application thereof. The preparation method includes: carbonizing a brake disc prefab, and densifying the carbonized brake disc prefab by chemical vapor infiltration method to obtain a C/C composite material; then performing heat treatment in an inert atmosphere to improve the graphitization degree of the composite material; then conducting machining to obtain a C/C composite blank; treating the C/C composite blank by molten silicon infiltration method to obtain a C/C-SiC composite brake disc; then treating the C/C-SiC composite brake disc by means of chemical vapor infiltration or precursor infiltration pyrolysis; and machining the obtained product into a final design size, thus obtaining a composite brake disc finished product. The C/C-SiC composite brake disc and the preparation method thereof provided by the invention can reduce the preparation cost and improve the mechanical performance, thermal conductivity and friction and wear performance of the brake disc.

The invention discloses a suspension type monorail train bogie. The suspension type monorail train bogie comprises a framework, a traction suspension device, guide wheels, walking wheels, a driving device, a brake device and a collector shoe. The at least eight guide wheels are arranged at the four end corners of the upper portion of the framework and the four end corners of the lower portion of the framework respectively, the driving device comprises a gearbox, the four walking wheels are arranged on four output shafts of the gearbox respectively, the guide wheels are solid rubber wheels, and the walking wheels are inflated rubber wheels. The eight solid rubber wheels are used as the guide wheels, the self-guide function of the bogie is achieved, the four inflated rubber tires are used as the walking wheels, longitudinal force between a train and a rail is transmitted, and the weight of the train is borne. The suspension type monorail train bogie is compact in structure, excellent in train running stability and riding comfort, and capable of being driven on lines with the big gradient (100 parts per thousand) and the small radius (the minimum curve radius of the plane is 30 m) and has the good adaptability to the complex terrain (up and down terrain, mountain cities and rivers).

The invention relates the low-alloy high-tensile structural steel and preparing method. The components are as follows: C:0.05%-0.60%, Si: 0.05%-0.70%, Mn: 0.5%-2.5%, P: <= 0.04%, S: <=0.04%, Cr: 0-0.70%, Ni: 0-0.70%, molybdenum: 0-0.60%, Cu: 0-0.20%, vanadium: 0.01%-0.30%, Al 0-0.1%, niobium: 0.001%-0.10%, N: 0.004%-0.02%, and the left is Fe. The method comprises the following steps: using revolving furnace to smelt, and using LF furnace to refine. The yield strength as is above 460Mpa, the dynamic ductility Akv is above 27J at low temperature (-40Deg.C), endurance life is above 2 million times, and the finished steel can be used for train brake beam, engineering machinery and hydraulic support without heat treatment. After quenching and high tempering modified heat treatment, the strength for extension of the steel is above 750Mpa, the dynamic ductility Akv is above 150J at low temperature (-40Deg.C). After carbonization, the steel can be used for abrasion-proof driving mechanism elements and parts.

Hand-operated brakes caster system is easy to use, compact, lightweight, low-cost. A fork supports a rotating wheel via an axle. A bag mounted base supports the swinging fork. A hollow swing shaft mounts on a base bearing. A force transmitting wire is pulled by a rotation knob in a controller away from the wheel. Opening direction force is applied by a spring to the wire in the opening direction. Therefore, if the knob is rotated by an angle not smaller than a predetermined value, reverse rotational moment is applied, locking the rotation knob. Force transmitted to a lever via the wire is magnified by the action of the lever, and the resulting force pushes a brake pin located inside the fork swing shaft. The brake pin abuts the tire resulting in frictional resistance preventing rotation of the wheel.

Vibrations generated by the wheel units of a vehicle are reduced by a low pulsating operation that optimally simulates actual vehicle operating conditions. For this purpose the mass moment of inertia of the wheel unit and of rotating components such as the hub and the brake disc are taken into account. The wheel unit is rotatably mounted on a balancing spindle (2) in a measuring apparatus to determine the mass and angular location of balancing weights (31). The vibrations are measured at a speed that corresponds to a typical travel speed of a vehicle. A loading mechanism including a roller shoe (20) applies a force to the tire tread surface through a spring damping (14, 15) to optimally simulate the conditions of a roadway. The roller shoe (20) has rollers (13) with sections of larger and smaller diameters so that neighboring rollers intermesh. The combined masses of the rollers, as reduced to the roller radius dw, corresponds to the rotational mass of the vehicle wheel as reduced to the tread radius (dR). It is also possible to disengage the contact force from the tread surface for dynamically balancing the wheel unit under load-free conditions. Thus, wheel-balancing steps under loaded and load free conditions can be done on one machine.

The invention provides a method for preparing 24CrNiMo bainite alloy steel by using a selective laser melting technology. The method includes the steps that a laser device is used for conducting scanning on 24CrNiMo alloy steel power which is spread out on a base plate according to a preset selective laser melt scanning route till the power melts. According to the method, by optimizing technology parameters, taking use of the effects of alloy elements such as C, Cr, Ni, Mo, the bainite alloy steel which is uniform in microstructure is obtained at a high selective laser melting cooling speed, the average micro-hardness of the obtained bainite microstructure reaches 330-346 HV, the tensile strength is 962-978 Mpa, the elongation ratio is 16.4-17.6%, the product of tensile strength and elongation reaches 16.1-16.9 Gpa%, and the microstructure has excellent matched strength and toughness. The method and the technology are mainly applied to selective laser melting manufacture of 24CrNiMo alloy steel high speed rail brake discs.

A gondola car has a body for lading carried on an underframe. The underframe includes a center sill and cross-bearers. The car has deep side beams having top chords, side sills, and side sheets. The lower portion of the car includes tubs that seat between the cross-bearers. The car may have an internal volume of more than 8000 cu. ft. The car may have rotary dump claw sockets. The car has opposed internal and external stiffeners aligned at the longitudinal stations of the cross-bearers. The internal stiffeners may be triangular cantilevers extending upwardly inside the side sheets. The side sheet lies intermediate the stiffeners and their flanges. The top chords may be wider in cross-section than the side sills. The side sills may define torque tubes that co-operate with the sidewall stiffeners and the top chords to resist lateral deflection. The car may include a false deck, or dog-house at one end to accommodate the brake reservoir and brake valve, such that the car is longitudinally asymmetric.

The invention provides a ceramic/metal composite material brake lining for a high-speed train and a preparation method of the ceramic/metal composite material brake lining, and belongs to the technical field of high-speed brake. The existing high-speed train brake lining has the defects that the thermal stability is poor, the friction factor is low, the abrasion rate is high, the thermal decay resistance is poor, and the service life is short. The ceramic/metal composite material brake lining comprises friction blocks, a base plate and a heat radiation fin, wherein the friction blocks are made of ceramic block reinforced metal composite materials, the gap width among the friction blocks is 3 to 8mm, the ceramic block is obtained through sintering ceramic posts of a certain rule and connected ceramic biscuits of ceramic substrates connected with the ceramic posts, and the connected ceramic biscuits can be formed in modes of slurry filling, gel mold filling, molding pressing, isostatic pressing and the like. The preparation method provided by the invention comprises the following steps including ceramic block sintering, surface treatment, brake lining casting, precise processing and heat treatment. The ceramic/metal composite material brake lining has the characteristics that the thermal stability is good, the friction factor is high, the abrasion rate is low, the thermal decay resistance is good, the service life is long, and the like, and the effective braking can be realized on 380km/h high-speed trains.

This invention is an apparatus and method for reversible intermodal conversion of transport tractors and trailers, highway-to-rail. Trailer add-ons are wheel mount shims and an axle housing draft sill pin receptacle. No add-ons are required for tractors. Highway-to-rail conversion involves securing a rail interface apparatus, consisting of rail carriage assemblies, bogies, and end coupler draft sills beneath each vehicle to align and bear loads-to-rails, and to provide draft load transfer. Staging is on paved grade slightly above rail level. Vehicle conversion is made without loading/unloading mechanized infrastructure, add-on weight, wheel removal, or powered actuators. Full use of inherent vehicle suspension and anti-roll devices is afforded. Draft sills, pneumatic brake lines, and knuckle couplers are employed for train configurations. Draft may be afforded by either a locomotive or a rail converted highway tractor.

The invention discloses a speed regulation and control system for a lifting mechanism of a tower crane. The lifting mechanism of the tower crane is controlled by a PLC through a frequency converter; the switching value of each shift during the ascending and descending of the tower crane is input into the PLC; the output of the PLC is connected with the frequency converter; the output of the frequency converter is connected with an ascending motor; and the PLC program design completes the logic operation of a given signal and a peripheral signal of the ascending frequency converter, the control of a brake, the logic judgment and alarm of various fault signals. An electrical towage system of the tower crane is subjected to technical transformation by using advanced PLC frequency conversion and speed regulation technology, so that the lifting mechanism of the crane realizes stable operation, enhances the operating efficiency, improves overload operation, eliminates starting impact and braking impact, reduces electric maintenance, reduces power consumption, and improves power factors. Simultaneously, the lifting mechanism has the advantages of over-current protection, over-voltage protection, under-voltage protection and input phase-lacking protection, and over-temperature protection, overload protection and over-speed protection of the frequency converter, overheat protection of a brake unit, an I/O fault protection, and motor fault protection and the like.

The invention relates to the field of machining, in particular to an automatic grinding and efficient drilling device for the surface of an automobile brake disc. The automatic grinding and efficientdrilling device comprises a material feeding assembly, a limiting assembly, a feeding assembly, a rotating assembly, a grinding assembly and a drilling assembly, the limiting assembly is arranged on one side of the material feeding assembly, the feeding assembly is arranged on the side of the limiting assembly, the rotating assembly is arranged on one side of the feeding assembly and located on the side of the material feeding assembly, the grinding assembly is arranged on the side, away from the feeding assembly, of the rotating assembly and located on the side of the material feeding assembly, the drilling assembly is arranged on the side, away from the material feeding assembly, of the rotating assembly, the rotating assembly comprises a three-jaw chuck and a gear driving mechanism, andthe gear driving mechanism is arranged on one side of the feeding assembly through a platform. According to the automatic automobile brake disc surface grinding and efficient drilling device, the problems that in the grinding and drilling process of the automobile brake disc, automatic feeding cannot be achieved, and grinding and drilling cannot be conducted at the same time are solved, manual labor is reduced, and the machining efficiency is improved.

The invention discloses a loading running-in device for a ball screw pair and a running-in testing method thereof, which belong to the technical field of running-in test of ball screw pairs. In the running-in device, a main spindle box and a tail seat are used for fixing a ball screw pair; a positioning plate is fixedly connected with a ball nut of the ball screw pair; automatic reversing running-in of the ball screw pair is realized by using a limit switch and a limit switch triggering rod; a magnetic powder brake is used for applying an axial load to the ball screw pair; a reversing mechanism is used for controlling positive and negative rotation of a tip; and a control cabinet is used for controlling other devices to work. The running-in test method comprises the following steps of: loading the ball screw pair; fixing the ball nut; performing a running-in procedure; parking; and testing performance parameters and unloading the ball screw pair. In the invention, the axial load is applied to the ball screw pair by using the magnetic powder brake, so that the delivery performance of the ball screw pair is enhanced; and the magnitude of the loaded load is easy to control, so that temperature rise of the ball screw pair after running-in can be tested accurately and conveniently.

The invention discloses a five-drive spherical robot using a mixed synchronous belt. The spherical robot comprises a spherical case and a track frame, wherein the spherical case is fixed on the outer surface of the track frame, and an annular rigid belt formed by the mixed synchronous belt is fixed in the track frame. Two ends of a center shaft are connected through a coupling center shaft motor and an electromagnetic clutch brake respectively and installed in an inner frame. A counter weight swing arm is connected with the center shaft and a counter weight box. Four pairs of T-shaped support arms are connected with a center outer frame and press wheel shafts, press wheels are sleeved on the press wheel shafts in a sliding mode and pressed on tracks of the track frame. Belt wheel shafts are installed in the middle of junctions of the T-shaped support arms, and synchronous belt wheels are mounted on the belt wheel shafts and meshed with the mixed synchronous belt. The four synchronous belt wheels move along the fixed rigid mixed synchronous belt to enable the counter weight position to change under the drive of circumferential motors and to enable the gravity center position of the spherical robot to change under the drive of a center shaft motor, and the spherical case is driven to roll along the ground. Motion control of the spherical robot is achieved through control of five motors.

The invention discloses a quadrilateral circular conveying system. The quadrilateral circular conveying system comprises a quadrilateral rail, a plurality of workpiece carriers and two translational trolleys, wherein the quadrilateral rail consists of two transverse rails and two longitudinal rails, the workpiece carriers move along the transverse rails, and the two translational trolleys move along the two longitudinal rails. The two transverse rails are parallel to each other and provided with a plurality of workstations. A brake component corresponding to each workstation is arranged between the workpiece carriers and the transverse rails and used for controlling the workpiece carriers to stop on the corresponding workstation or move continuously. Extension rails butt jointed with the transverse rails are arranged on the upper surfaces of the translational trolleys, and a locking mechanism used for positioning the workpiece carriers on the translational trolleys is arranged between the workpiece carriers and the translational trolleys. The rails form a quadrangle with a pair of edges parallel, so that workpieces can face outwards by different sides on the two transverse rails, and two sides of the workpieces can be conveniently processed technically. The brake components are reliable in structures, convenient to operate, applicable to popularization and use in the workpiece circular conveying system, especially for large workpieces, and the advantages of the brake components can be more prominent.