183results about How to "Safe and reliable braking" patented technology

The invention relates to a moving model test braking method and a braking system thereof for train aerodynamic performance simulation. The braking method comprises: arranging friction material on one section of running track of a train model so as to make the train model suffer a friction and decelerate when running to the track; on the running track of a train model, arranging a braking pendant connecting with a traction rope which connects to a braking wedge capable of being articulated with the braking pendant with a piston body in a braking cylinder; when the train model passes by the braking pendant, connecting the braking wedge with the braking pendant. The invention is capable of realizing safe braking in an ultrashort distance and not producing any interference to train-carried test system in the train model, and realizing safe and effective braking of high-speed train through mechanical mode, thereby being favorable to ultrashort distance arrangement of test track, reducing design cost of train aerodynamic performance simulation test, and improving safety of braking of train model.

The invention relates to a frictional material, in particular to a novel brake pad material of truck. The invention provides a novel brake pad material of a truck, wherein the novel brake pad material is used in a dry one-step hot press molding process applied to a nanocopper modified phenolic resin agglutination technology and a parent material modifying and adjusting technology. The raw material mixing ratio of the novel brake pad material is as below: 15%-20% of binder, 30%-50% of framework material, 10%-15% of friction enhancing agent, 5%-10% of anti-friction agent and 20%-30% of filling material. The binder is nanocopper modified phenolic resin, the framework material is mineral fibre and the like, the friction enhancing agent is great-hardness chromium ore power, and the like, the anti-friction agent is low-hardness graphite, and the like, the filling material is BaSO4, coarse whiting, and the like. The novel brake pad material has the advantage that a brake lining has a stable friction factor, stable recovery performance, good heat resistance, no crack performance, low speed sensitivity, good wearability and no braking noise.

Disclosed is a fuzzy adaptive pictorial information digitizer (PID) control method of a motor train unit based on multi-model switch. According to the method, a data driving modeling method is proposed according to collected running process data of the motor train unit and field experience knowledge, the number of braking models is determined by means of subtraction cluster, and then a plurality of partial linear models describing a braking process of the motor train unit are established. The partial linear models adopt the recursive least-squares method to identify model parameters. At each sampling moment, an optimal partial model is selected based on the multi-model switch strategy, and the fuzzy adaptive PID control algorithm is adopted to control the braking process of the motor train unit, and therefore safe, punctual and effective running of the motor train unit is achieved. The multi-model adaptive PID control of the braking process of the motor train unit is simple, practical, capable of achieve multi-purpose control of the braking process of the motor train unit, and suitable for on-line monitoring and automatic control of the braking process of the motor training unit.

The invention relates to an energy-consumption braking control module of a three-phase asynchronous motor, comprising a power supply unit, a single chip control unit and a braking direct-current voltage output unit, wherein direct-current voltage output by the braking direct-current voltage output unit is transmitted to a two-phase stator winding of a motor when the motor stops so as to generate braking torque. The energy-consumption braking control module of a three-phase asynchronous motor is characterized in that the single chip control unit detects the work state of the motor by the work conduction angle of the voltage output unit, and a preset program controls the size of the conduction angle so as to regulate the output time and magnitude of the direct-current voltage required by braking. The energy-consumption braking control module of a three-phase asynchronous motor also comprises a zero cross signal detection unit, a running state detection unit, a winding temperature detection unit and a braking current detection unit, wherein each unit respectively outputs a corresponding signal transmitted to the single chip control unit for processing. The invention adopts integrated IC, has little used elements, compact structure, independent products and convenient installation and use and is beneficial to popularization and application; and the single chip is flexible to control, the intellectualized degree is high, and the braking of the motor is safe and stable.

The invention discloses an overload protection type intelligent twisting and grinding machine, which comprises a tension sensor component, a display measurement component, a switch, a setting control component, an equipment power supply component and an electric starting maneuvering twisting and grinding body. The overload protection type intelligent twisting and grinding machine disclosed by the invention has the advantages of small size, simple construction and convenience in installation and is suitable for the safe monitoring of a small maneuvering twisting and grinding machine for the line construction, and the stressing situation of traction equipment can be visually reflected. When a working load exceeds a set load, the overload protection type intelligent twisting and grinding machine can automatically stop operating, and the requirement of safe construction is achieved. The equipment can be electrically started, and an engine can charge a power supply during operation.

The invention relates to an electronically controllable pneumatic brake system (100), comprising: at least two brake circuits (A, B, C), wherein at least one of the at least two brake circuits (A, B,C) is assigned an electrically and pneumatically controllable control valve (11, 13) for specifying brake pressures (p1, p2, p3, p4, pPB) for controlling wheel brakes (1, 2, 3, 4) of the associated brake circuit (A, B, C); and a first control unit (110), which is designed to electrically control the control valve (11, 13) in question in accordance with a vehicle target deceleration (zSoll) requested in an automated manner or in accordance with an actuation (ds) specified by the driver by means of an actuation device (24a). According to the invention, at least one bypass valve (21) associated with a control valve (11, 13) is also provided, which bypass valve is designed to pneumatically (pA, pB) control the associated control valve (11, 13), wherein the pneumatic control (pA, pB) is performed in accordance with the vehicle target deceleration (zSoll) requested in an automated manner or in accordance with the actuation (ds) specified by the driver.

The invention relates to a control circuit of a fast and low-noise brake and belongs to the technical field of an elevator for a permanent-magnet synchronous traction machine. The control circuit comprises a transformer, a safety switch, a band-type brake switch and a brake coil, wherein the input end or output end of the brake coil is connected with an emergency stop switch in series. Since the overall circuit control is not changed, and just one emergency stop switch is added in the control circuit, and the switch is fully controlled by an elevator control system. The emergency stop switch does not act when the elevator normally runs, and the emergency stop switch acts only when the elevator needs emergency braking. The emergency braking of the elevator happens in a few circumstances, so the damage of the brake coil can be neglected; and due to the existence of the emergency stop switch, the brake braking can be divided into two modes, one braking is braking when the elevator normally runs, and the other braking is braking when the elevator is in an emergency situation. Not only can braking noise of the brake be greatly reduced, but also the stopping of the elevator is safer by adopting the control mode.

The invention discloses a split-type brake disc. The split-type brake disc comprises a disc hub, friction blocks and installation pins. The disc hub is provided with a middle hole. The number of the friction blocks is an odd number larger than three; each friction block comprises two friction plates and a plurality of radiation ribs, wherein the radiation ribs are located between the two friction pieces, and the two friction plates and the radiation ribs of the friction block are integrally formed or fixedly connected. Flanges of the disc hub are located between the two friction plates of each friction block. Each friction plate is provided with an installation boss, and the installation bosses are provided with installation holes. The flanges of the disc hub are provided with flange holes. The installation pins penetrate through the installation holes in the installation bosses and the flanges holes in the flanges so that the friction blocks can be fixedly connected with the disc hub. The friction blocks are installed on the disc hub in an annularly-arrayed mode, and a gap exists between every two adjacent friction blocks. The split-type brake disc is good in thermal stress relief effect, reliable in installation and convenient to disassemble and assemble.

The invention discloses a free-fall control method of a locking device of a crane. The control method comprises the following steps of: releasing the locking device on a free-fall height, and detecting a tensile force of a steel wire rope in the process; and when the tensile force is 0, controlling a hoist to brake by an electromagnetic valve. The invention further discloses a controller, a control system and a crane for realizing the method. By the technical scheme, an automatic detecting and controlling method is used to replace the method of judging and controlling the hoist to brake through a manual visual inspection method in the prior art; the brake time can be exactly grasped, and errors can be reduced, so that the potential security risks which possibly occur in free-fall brake can be reduced, and the whole process of the hoist to brake is safe and reliable; and the scheme does not depend on factors such as observation ability, response speed, working experience and operation number degree of an operator, so that the error operation caused by manual factors can be reduced.

Disclosed are a multi-wheel-train brake system and a control method thereof. An antiskid control box conducts logical operation on brake pressure state signals output by hydraulic pressure relays and speed state signals of an airplane, and whether the airplane is in a low-speed and low-energy state or other states is determined; when the airplane is in a low-speed and low-energy state, the antiskid control box controls electro-hydraulic pressure servo valves not to output the brake pressure to a left front airplane wheel set and a right front airplane wheel set, and the left front airplane wheel set and the right front airplane wheel set are forbidden from braking; and under the other conditions, the left front airplane wheel set, the right front airplane wheel set, a left rear airplane wheel set and a right rear airplane wheel set carry out braking. The characteristic of the large brake torque of brake main airplane wheels of a carbon brake disc in the low-speed and low-energy stage of the airplane is fully utilized, under the premise that the using requirements of the airplane for the brake system are met, and the brake times of the brake airplane wheel sets are decreased by decreasing the number of the airplane wheel sets, so that the problem of serious abrasion of the carbon brake disc in a low speed is solved, and accordingly the service life of the brake main airplane wheels is prolonged.

The invention discloses a regenerated braking energy recovery optimization method and system for a hybrid power tramcar. According to an operation characteristic curve of the fuel cell hybrid power tramcar and a mechanical characteristic curve of a traction motor, braking operation control optimization of a driving mode is set, electric braking force is fully utilized, and braking energy feedbackis maximized; and then, by optimizing energy management strategies, output distribution of all power supplies is controlled, and braking energy recovery is maximized. According to the regenerated braking energy recovery optimization method and system for the hybrid power tramcar, stable braking and braking energy recovery are achieved while it is ensured that a fuel cell hybrid power system supplies electricity to the load of the tramcar reliably; under the premise of ensuring the braking property of the system, braking optimization of combination of feedback braking, energy consumption braking and mechanical braking is achieved, braking energy recovery is maximized as much as possible, the fuel utilization rate is increased, and the purpose of fuel economy is achieved; and braking noise is reduced, emission is reduced, the service life of an energy storage device is prolonged, the operating cost is reduced, and the braking safety of the tramcar is improved.

The invention provides a braking control method and device and an electric drive vehicle; the method is applied to the electric drive vehicle and comprises the following steps: detecting a brake system of the vehicle; sending a braking request to a vehicle-mounted control panel when a brake system fault is detected; enabling the vehicle-mounted control panel to display a selection interface containing at least one braking instruction according to the braking request; receiving the braking instruction sent by the vehicle-mounted control panel, wherein the braking instruction is sent by the vehicle-mounted control panel when detecting a preset operation on the selection interface; controlling a motor of the vehicle to carry out reverse dragging braking according to the braking instruction. According to the braking control method, the vehicle-mounted control panel serves as a channel for communication between a driver and a vehicle when the brake system breaks down, so the driver can control reverse dragging brake of the motor through the vehicle-mounted control panel; flexible, safe and reliable braking of the vehicle is achieved, and safe driving of the vehicle is achieved.

The invention discloses a rail clamping device structure (20) which comprises a frame (1), a cam mechanism (7) and clamp plates (3, 6), wherein the cam mechanism (7) is installed on the frame (1) and can rotate around the rotating center thereof; the clamp plates (3, 6) are pivoted to the frame (1) through an axis pin (11); one ends of the clamp plates (3, 6) can be connected between a first position (A') and a second position (B') of the cam mechanism (7), thereby driving the clamp plates (3, 6) to pivot around the axis pin (11) and driving the pivoting movement corresponding to the pivoting movement of the clamp plates (3, 6) around the axis pin (11); and the other ends of the clamp plates (3, 6) can respectively form a joint with a rail (17) to realize clamping and disengagement, thereby realizing releasing.

The invention discloses a copper-based powder metallurgical friction material for brake. The copper-based powder metallurgical friction material mainly comprises the following components of 50 to 55%of Cu (copper), 1 to 2% of Ni (nickel), 1.5 to 2.5% of Sn (selenium), 16 to 20% of Fe (iron), 2 to 4% of Cr (chromium), 3 to 4.5% of Mo (molybdenum), 2 to 3% of W (tungsten), 1 to 1.5% of MgO (magnesium oxide), 1 to 1.5% of ZrO2 (zirconium dioxide), 0.5 to 1% of MoO3 (molybdenum trioxide), 1.5 to 2.5% of Ti (titanium), and 9 to 13% of C (carbon). The copper-based powder metallurgical friction material has the advantages that by adopting the particular design on proportional ratio of raw materials and components, the comprehensive property is excellent; the brake requirement of a high-speed train can be met, and the use and maintenance cost of the high-speed train is reduced.

The invention relates to a mouse-cage type tapered rotor electromotor, and the main design of the electromotor comprises that: an inner cavity of a stator and the surface of a rotor of the electromotor are tapered; the tapered rotor is simultaneously used as a brake. After a triphase winding of the stator is connected with a power supply, an axial magnetic pull force is generated to allow the rotor to generate axial movement; an axial braking spring is drawn; and the tapered rotor is pushed to enable the normal operation of the electromotor; when the electromotor is needed to be stopped, the power supply of the electromotor is powered off; and then the axial magnetic pull force disappears; under the action of resilience of the spring, the tapered rotor rapidly brakes to allow the rotor to stop rotating immediately, thereby realizing the function of rapid braking.

A well repairing truck is composed of truck frame, driver cab, engine system, front, middle and back bridges, hydraulic oil tank, speed varying gear, winder, operating cab, the drive system consisting of power output unit, speed variator, primary and secondary hydraulic motors, commutation valve, hydraulic pump, power unit, winder, etc, the hydraulic system consisting of winder, primary and secondary hydraulic motors, energy accumulating pump, master control valve set, energy accumulator, hydraulic pump and power unit, and the electronic control system.

The invention discloses an electric auxiliary vehicle that powered by two motors. Wherein, the power device is formed by two groups of motor, two groups of storage battery, two controller, and two groups of switch and chain wheels. It uses storage batteries and motor to drive the vehicle which can effectively solve the defects of present electric auxiliary vehicle, with easy operation, saved energy and long driving mileage, while it can be used in city and country.

The upward travel protector for lift includes a clamping mechanism, a triggering mechanism and a resetting mechanism, and is held inside one box hinged to the pedestal. The power spring drives one end of the cam body to generate rotation moment, and cam surface presses the braking board to realize braking; the motion of the eccentric wheel and the rod generates reverse rotation torque to make the protector release; and the triggering force is reduced with the lever and the control board in special structure. The present invention can brake lift in case of accident overspeed during upward traveling. The present invention operates mechanically and has safe and reliable braking, greatly reduced triggering force, timely and accurate triggering, and compact structure. The present invention is also suitable for the braking of other system with steel cable.