34results about How to "Prevent flying car phenomenon" patented technology

The invention discloses an anti-runaway protection system and method for a downward belt conveyor. The protection system comprises a damping device, a hydraulic execution subsystem and a control subsystem, wherein the damping device is used for braking running of the belt conveyor mounted on a downward inclined surface in parallel; the hydraulic execution subsystem is used for driving the damping device to move; the control subsystem is used for detecting and controlling the running state of the belt conveyor in real time; and the system is convenient to mount and operate. The protection method comprises steps as follows: 1, working condition information of the belt conveyor is acquired in real time, and the acquired information is stored and uploaded synchronously; 2, the revolving speed of a motor of the belt conveyor is analyzed and processed; 3, whether a power supply module of a power grid is powered off or not is judged; 4, the belt conveyor is controlled to brake and slow down intermittently; 5, the belt conveyor is controlled to shut down. The system is novel in design, the runaway phenomena of the belt conveyor can be detected and controlled, the belt conveyor can be protected to shut down stably under the condition of the power failure, the condition of runaway of the belt conveyor due to the dead weight of materials during the power failure can be avoided, and the use effect is good.

The invention discloses a PMSM (permanent magnet synchronous motor) load simulation system and a control method therefor, and the system comprises a load simulation PMSM, a load simulation motor drivecircuit, and a data collection control system. The load simulation PMSM is connected with the output end of the load simulation motor drive circuit, and the output shaft of a tested motor is connected with the output shaft of the load simulation PMSM through the shaft coupler. The data collection control system includes a microcontroller, and the input end of the microcontroller is connected witha three-phase current sampling circuit, a three-phase voltage sampling circuit, a speed sensor and a torque sensor. The load simulation motor drive circuit is connected with the output end of the microcontroller. The control method includes the steps: 1, data collection and transmission; 2, data preprocessing 3, the control of the load simulation PMSM in an SVPWM direct torque control mode. The system can accurately simulate a load under different working conditions, has simple method steps, is convenient to implement, and is convenient for popularization and use.

The invention discloses a control method and a control system for runaway of a diesel engine. The control method includes the steps: calibrating an angular acceleration threshold value according to start of the diesel engine to a critical runaway state; acquiring the current angular acceleration of the diesel engine in real time; and reducing the fuel oil supply quantity when the current angular acceleration is larger than the calibrated angular acceleration threshold value. The control method calibrates the angular acceleration threshold value, and a certain time interval is reserved from incontrollable rotational speed to rated rotational speed, so that measures can be taken in advance when the incontrollable rotational speed does not rise violently to the rated rotational speed, namely, using the control method can timely and properly handle a runaway failure in the earlier stage, and further runaway is timely and effectively avoided.

The invention discloses a wind driven generator yawing device capable of effectively withstanding strong wind attack. A connection arm is eccentrically mounted relative to a yawing rotary seat, a tail vane rotary sleeve is rotatably connected onto the connection arm and positioned behind the yawing rotary seat, and the tail vane rotary sleeve is in a tilted arrangement in a way that the higher the tail vane rotary sleeve is, the closer the tail vane rotary sleeve approaches to the side of the yawing rotary seat. A tail vane rod is fixed onto the tail vane rotary sleeve, a first limiting block and a second limiting block are positioned on two sides of the tail vane rod respectively and arranged on the connection rod, and a limiting plate is arranged on the tail vane rod. A tail vane plate is perpendicular to a vane rotation surface when the first limiting block and the limiting plate are in abutted connection. The tail vane plate is parallel to the vane rotation surface when the connection arm rotates relative to the tail vane rod to drive the second limiting block to be in abutted connection with the limiting plate. The wind driven generator yawing device has the advantages of simplicity, reasonability and compactness in structure, convenience in installation, low implementation cost, capability of automatically adjusting vane rotation speed according to wind speed, avoidance of galloping and the like.

The invention discloses a wind-driven generator based on the spring characteristic to adjust a wind mouth, the wind quantity and the wind speed. The wind-driven generator structurally comprises a windspeed adjusting device, a wind-driven generator body and a high-strength supporting rack, wherein the bottom face of the wind-driven generator body is vertically connected with the high-strength supporting rack, and the wind-driven generator body is provided with the wind speed adjusting device. Compared with the prior art, the wind-driven generator based on the spring characteristic to adjust the wind mouth, the wind quantity and the wind speed has the beneficial effects that the size of a wind inlet mouth is adjusted utilizing the characteristic of being capable of equidistantly shrinks from one ring to another of springs, so that the wind inlet quantity is adjusted, and then control of the wind speed is realized, the wind speed is made to be not much more than the rated wind speed to avoid emergency brake failure of the wind-driven generator, so that appearance of the wind-driven generator coasters phenomenon is prevented, wind-driven generator damage can be avoided to a large extent, and minitype wind-driven generators on the coast are made to be also capable of running to generate electricity utilizing the wind energy during the summer typhoon high-incidence season.

The invention relates to the technical field of electric unicycles, and discloses an electric unicycle with a detachable handle. A connecting portion is arranged on the upper portion of a shell of the electric unicycle, and the connecting portion is detachably connected with the handle through a connecting part; the handle is of a telescopic structure, and an oval holding portion is arranged at the end of the handle; and an outward inclined angle exists between the holding portion and the handle. The electric unicycle can be conveniently carried, and a rapid-dismounting screw component is firm in fixation; tools are not needed, a beginner can conveniently hold the handle to assist body balance, the unicycle flying phenomenon is avoided, safety of a rider is improved, and two fixing devices are arranged on the upper portion of a telescopic rod, and can be fixedly connected with components such as a mobile phone and a camera so as to serve as snapshot rods, picture recording in riding and other actions.

The invention discloses a control method based on a six-degree-of-freedom serial robot that does not satisfy the Pieper criterion, and belongs to the technical field of robot motion control methods. The motion control method of the six-degree-of-freedom serial robot in the prior art is only applicable to the six-degree-of-freedom serial robot satisfying the Pieper criterion, and the control precision of the six-degree-of-freedom serial robot not satisfying the Pieper criterion is not high, and the control process is cumbersome. The present invention proposes a new analytical control method based on the same joint coordinate system. When establishing a coordinate system for a six-degree-of-freedom serial robot, all joint coordinate systems are consistent with the coordinate directions of the robot base coordinate system, and the "calibration method" is adopted " and "conversion method" to deal with the six-degree-of-freedom series robot that does not meet the Pieper criterion. High precision.

The invention discloses an impeller galloping control method in an aerodynamic performance experiment of a horizontal axis wind turbine. The method comprises steps that a reflective stripe is pasted on a transmission shaft of an experiment device in a wind tunnel, a laser rotating speed measuring instrument is arranged outside an observation window of the wind tunnel, and the reflective stripe is right opposite to the laser rotating speed measuring instrument; a wind tunnel is started, the rotating speed of the impeller is monitored through the laser rotating speed measuring instrument, a rotating speed change curve along with time is established in a computer, and the wind tunnel is closed till the impeller gallops; the galloping process is repeated after the blade mounting angle is adjusted; the computer automatically converts the rotation acceleration of the galloping at the moment before the galloping; an aerodynamic performance experiment is started, the rotating speed of an impeller is monitored in real time, the rotating acceleration at each moment is automatically converted by a computer, the rotating acceleration obtained in real time is compared with the rotating acceleration at the moment before galloping, and the output load capacity of an electric loader is controlled according to a comparison result; and when the real-time output load capacity of the electric loader reaches the total output load capacity set by the experiment, the comparison process is stopped, and the impeller enters a constant-speed rotation process from starting.

The invention relates to an accumulator car motor controller with a handle resetting function and belongs to the technical field of accumulator car control. The accumulator car motor controller comprises a brake detection device, a sensor resetting circuit, a system protection circuit, a control circuit and a handle, wherein the brake detection device and the sensor resetting circuit are connected with the system protection circuit which is connected with the control circuit, and the control circuit is connected with the handle. The accumulator car motor controller with the handle resetting function has the advantages of effectively preventing an accumulator car from galloping, enabling the accumulator car to be controlled easily and facilitating driving safety.

The invention provides a driving device with a safety device. The driving device comprises a motor, a self-circulating pump, the safety device and a hydraulic system. The driving device cannot happenthe galloping phenomenon; and when a fault occurs in a speed regulating portion of the driving device and the maximum operating speed of the driving device cannot be controlled, the safety device in the driving device can automatically control the maximum operating speed of the driving device to not exceed a set value, so that the galloping phenomenon is avoided.

The invention discloses a motor galloping protection system. The motor galloping protection system comprises a controller and a data processing circuit, wherein the data processing circuit controls the controller to be connected with a motor after receiving a starting signal for representing the normal work of the controller, so a motor is allowed to move according to the operation of the controller. By applying the above technical scheme, the controller can control the motor only when the starting signal is received, and the controller and the motor are in a disconnected state when the starting signal is not received, so the phenomenon of galloping of the motor under the conditions that the controller is abnormal and the like can be effectively prevented, and the safety of controlled equipment and personnel is further protected. In addition, the invention further discloses a motor galloping protection method which corresponds to the motor galloping protection system and has the same effect as the motor galloping protection system.