35results about How to "Braking is simple" patented technology

The invention discloses a three-phase power supply default phase and power failure detection system and a braking method. The detection system comprises a three-phase power supply RST, a rectification circuit, a relay circuit, an IPM circuit, two optocoupler processing circuits, a DSP processor, a braking circuit, a Nixie tube and a servo motor and is applicable to a motor control system of a servo driver. The braking method comprises the following steps: judging abnormal conditions such as default phase and power failure of the three-phase power supply, then closing a PWM signal by the DSP processor, cutting off a busbar power supply by virtue of the relay circuit, starting and accessing the braking circuit, connecting a braking power resistor among three-phase windings of the servo motor in series for realizing short connection of the three-phase windings, and generating current in a short connection loop by virtue of residual magnetism potential of a stator winding, so that the motor is rapidly braked. The detection system and the braking method, which are disclosed by the invention, have the advantages that security protection effect on electrical equipment and personnel is realized, implementation is easy, cost is low, and the problems that a motor in existing electrical equipment adopts a band-type brake module, price is high, size is large and control and wiring are complex can be solved, so that the detection system and the braking method have a good application prospect.

The invention relates to the technical field of oil and gas drilling and geological exploration, in particular to a hydraulic winch and a drilling machine. The hydraulic winch comprises a support and two braking assemblies; the support comprises a box assembly and two end cover assemblies; the box assembly comprises a hollow-inside box and two gear case shells symmetrically connected to the two ends of the box; the two braking assemblies are symmetrically arranged at the two ends of the box; each braking assembly comprises a driving mechanism, a speed reducing mechanism and a braking mechanism; the driving mechanisms are arranged on the end cover assemblies; the speed reducing mechanisms are arranged on the gear case shells; the driving mechanisms are connected with the speed reducing mechanisms; and the braking mechanisms are connected between the driving mechanisms and the speed reducing mechanisms. According to the hydraulic winch, when the hydraulic winch needs to be braked, the braking mechanisms can directly brake the driving mechanisms, because the torque generated by the driving mechanisms is small before being transmitted to the speed reducing mechanisms, braking is easy, braking is flexible, reliable and high in safety, and the hydraulic winch is suitable for being used in large hydraulic winches.

An electric working machine including: a motor; a driving unit configured to be driven by the motor; a trigger switch configured to allow rotation of the motor; a power supply unit configured to supply electric power to the motor; and a control unit configured to control rotation of the motor, characterized in that: the electric working machine further comprises a switching element configured to perform short-circuiting between terminals of the motor to apply electronic braking, wherein the control unit is configured to perform adjustment of the braking by controlling the switching element when stopping the motor.

The invention discloses a hydraulic braking system. The braking system comprises a braking pump, a prefill valve and a treadle valve, wherein the oil outlet of the braking pump is connected with the oil inlet of the prefill valve, the return opening of the prefill valve is connected with a return tank; the prefill valve comprises a first charging port and a second charging port; the treadle valve comprises a first treadle valve and a second treadle valve, wherein the first charging port is connected with the oil inlet of the first treadle valve, the second charging port is connected with the oil inlet of the second treadle valve, and the return openings of the first treadle valve and the second treadle valve are both connected with the return tank, the oil outlet of the first treadle valve is connected with a rear axle brake, and the oil outlet of the second treadle valve is connected with a front axle brake. By adopting the hydraulic braking system, the braking system can be greatly simplified in structure; by adopting two-way braking, the reliability is high.

The invention relates to a pneumatic variable pitch brake system of a wind power generator. Fan blades are rotatablely installed on a wheel hub of the wind power generator by a fan blade shaft, the wheel hub is connected with a rotor shaft, one side of the rotor shaft is provided with a disc type brake, the pneumatic variable pitch brake system is arranged at the front end of the wheel hub, and comprises a synchronous disc drive mechanism, a synchronous disc and a variable pitch connecting tumbler connected with the synchronous disc, and the variable pitch connecting tumbler is connected with the fan blade shaft of the fan blades, to drive fan blade variable pitch to be braked. The pneumatic variable pitch brake system is quick in reaction and is suitable for severe environments, is hardly influenced by environment, can be used in moist, dusty, vibratory and over-cold and over-hot environments, furthermore, a drive mechanism is simple in drive, and direct in driving force, so that the failure rate is greatly reduced, and power generation security of the wind power generator is guaranteed. When the pneumatic variable pitch brake system is aerated, the wind power generator normally works, and when the pneumatic variable pitch brake system is deflated, the wind power generator is braked or the variable pitch is performed, so that the wind power generator can be controlled without the sudden interruption or deflation, the variable pitch brake system can be manfully controlled or automatically controlled by a programmable logic controller (PLC), and the manual control is matched with the automatic control, and therefore, the wind power generator is safe and stable to work.

The invention relates to a method for algae removal of aquiculture water by use of a high-voltage pulsed electric field and belongs to the technical field of aquiculture. The method adopts a specific process and such specific parameters as output voltage of 18-25 kv, pulse width of 12-20 [mu]s and pulse frequency of 50-80 Hz; then a generator is started up for circulating water treatment for 2-3 times, circulating treatment of aquatic water effectively breaks algae floccules and cell lethal, the algae removal ratio is 96-97 percent, and the algae control purpose is achieved; meanwhile, a coagulant (polyaluminium sulfate) and a sludge pumping machine are provided to realize algae body flocculation and sedimentation and withdrawal, and the algae removal ratio can be increased to 100 percent to the utmost extent; algae decomposition for algal toxin release is prevented, and the healthy environment of aquatic water is effectively guaranteed. The method provided by the invention is a physical method, is good in effect, most direct, free from secondary contamination and low in cost, can remove all algae and is very suitable for being applied to algae removal of aquiculture water.

The invention relates to braking systems, in particular to an automatic circulation system and an automatic circulation braking system established by the same. The automatic circulation system and the automatic circulation braking system established by the same are suitable to loading machines and other vehicles and can achieve full effect braking through automatic circulation of brake fluid. The automatic circulation system comprises a booster pump, a check valve, an on-off control piece, an oil return pipe, oil line pipes and a brake caliper. The air inlet of the booster pump is externally connected to an air source, the oil outlet of the booster pump is connected to the inlet of the check valve, the outlet of the check valve is connected to the oil inlet of the brake caliper through the oil line pipes, the oil outlet of the brake caliper is connected to the oil inlet of the on-off control piece through the oil line pipes, the oil outlet of the on-off control piece is connected to one end of the oil return pipe, the other end of the oil return pipe is connected to an oil cup of the booster pump, and the air inlet of the on-off control piece is externally connected to the air source. The automatic circulation braking system comprises a pressure regulating valve, an air storage cylinder, a pneumatic brake assembly, a front axle automatic circulation system and a rear axle automatic circulation system.

The embodiment of the invention discloses an engine braking method and device and a vehicle. The engine braking method comprises the steps that the state of an engine auxiliary braking switch is obtained; a vehicle driving signal is obtained, wherein the vehicle driving signal at least comprises a brake signal; and if the state of the engine auxiliary braking switch is automatic braking, the braking state of the engine is automatically controlled according to the vehicle driving signal. According to the technical scheme provided by the engine braking method and device and the vehicle, controlover engine braking is simplified, normal work of the vehicle is guaranteed, distraction of a driver is avoided, and safety guarantee is improved.

An elevator, which comprises an elevator car (1), which is arranged to move in the elevator hoistway (S), a brake (2) on the elevator car (1), a lever mechanism (12,17,18) connected to the brake (2), by- moving which lever mechanism in relation to the elevator car the brake (2) can be transferred to the braking position, a detent (5) in the elevator hoistway, a detent (6) on the elevator car, via which detent the aforementioned lever mechanism can be moved in order to cause braking of the brake (2), and which detents (5,6) on the elevator car and in the elevator hoistway can be brought, by moving at least one of the detents (5,6), to a relative position, in which the detents (5,6) are on a collision course. The elevator comprises - controllable means (7,8,9) for affecting the position of the detent (6), by controlling which means (7,8,9) the detent (6) can be moved between position I and position II, in which position I the detent (6) on the elevator car and the detent (5) in the elevator hoistway are on a collision course with each other, and in which position II the detents (5,6) are not on a collision course, - a control (10) for controlling the means (7,8,9).

The invention discloses a ball valve for sampling, a natural gas hydrate fidelity sampler and a sampling method. The ball valve comprises a shell and a valve core which are matched with each other, the valve core is fixedly connected with a plug pin partially located outside the shell, and the part, located outside the shell, of the plug pin is matched with a steering head; and the ball valve further comprises a first piston for driving the steering head to rotate. The invention aims to provide a ball valve for sampling, a natural gas hydrate fidelity sampler and a sampling method. The problems that in the prior art, the sealing process and the sealing structure of a natural gas hydrate sampler are very complex, and the pressure maintaining effect is limited are solved, rapid sealing and opening of the sampler are achieved, pressure stability is guaranteed, and the fidelity degree of a sample is improved.

The invention discloses an anti-strain abdominal muscle wheel special for fitness beginners. The wheel comprises a grip and a rolling wheel; the rolling wheel is arranged in the middle of the grip androtatably connected with the grip, the grip is provided with a brake device and a counting device, the rolling wheel is provided with a friction ring, and the friction ring and the brake device are arranged at the same side of the rolling wheel and cooperate with each other; the brake device comprises a connecting device, a pressing block and a brake rod, the connecting device is connected with the grip, the brake rod is parallel to the grip, one end of the brake rod cooperates with the connecting device, the end of the brake rod is connected with the pressing block, through the cooperation of the pressing block and the friction ring the counting device and the brake device are arranged at the opposite sides, the end of the grip is provided with a charging port, and the charging port is electrically connected with the counting device.

The invention relates to the field of automobile braking, and particularly discloses a brake caliper integrated with a brake booster, the brake caliper comprises a caliper body and a brake cylinder arranged in the caliper body, a caliper piston, a transmission assembly and a rotating part are arranged in the brake cylinder, the transmission assembly comprises a pushing part capable of moving in the braking direction and pushing the caliper piston. A plurality of first cambered surfaces annularly arranged on the surface of the rotating part are arranged on at least one of the front side and the rear side of the rotating part, second cambered surfaces are arranged at the opposite positions of the first cambered surfaces, and balls are arranged between each pair of the first cambered surface and the second cambered surface; the ball is limited by the first cambered surface and the second cambered surface, can relatively slide along the ramp therein and drives the rotating piece to linearly move in the braking direction; the invention overcomes the limitations of the above solution by further reducing the need for hydraulic installation and the number of components, while retaining the possibility of arranging first-stage, second-stage or third-stage redundancy in the control device and without producing significant costs.

The invention relates to a brake shoe assembly with a wireless alarm function, and belongs to the field of brakes. The brake shoe assembly comprises a brake shoe piece and a friction lining piece laidon the inner circle face of the brake shoe piece. The brake shoe assembly further comprises a wireless alarm. The wireless alarm is arranged on the brake shoe piece or the friction lining piece so asto monitor the thickness changes of the friction lining piece and send alarm signals to an instrument panel. Because the wireless alarm is additionally arranged in the brake shoe assembly, when the friction lining piece is worn to the limit thickness, the wireless alarm emits an alarm signal to the instrument panel after detection. The brake shoe assembly is high in alarm precision and timely inalarming. Meanwhile, only a traditional manufacturing process is needed to produce the brake shoe assembly. Whole brake can be realized without modifying traditional brake parts. The manufacturing issimple, and the safety and reliability are realized.