33results about How to "Speed ​​real-time control" patented technology

The invention discloses a smoke exhaust blockage control method of a gas water heater and a control system thereof. The controller drives and controls the blower rotating speed of the gas water heater by changing the drive current, judges whether the smoke exhaust resistance of the water heater exceeds the warning limit based on the real-time monitoring on the blower rotating speed, closes the gas passage of the water heater and warns the water heater user when the smoke exhaust resistance exceeds the warning limit, and judges whether air supply for compensation is necessary when the smoke exhaust resistance is lower than the warning limit. The invention aims to provide the detecting method for judging the smoke exhaust condition at the air outlet by detecting the blower rotating speed, and the control method and the control system for controlling to improve the combustion working condition of the constant-temperature gas water heater in case of smoke exhaust blockage and improve the working stability of the water heater.

The invention discloses a mechanical arm zero force control experimental system facing direct demonstration. The system comprises a n-degree-of-freedom mechanical arm with n flexible joints, and a main controller; each flexible joint of the mechanical arm is provided with a sensor acquiring circuit and a joint controller; each joint controller communicates with the main controller through a bus mode; each sensor acquiring circuit comprises a joint speed sensor, a joint position sensor and a joint torque sensor for respectively acquiring speed information, position information and torque information of each flexible joint and sending to the main controller; the main controller performs the zero force control to obtain each joint compensation torque value needing compensation and to return to each joint controller; and through a torque-speed loop control algorithm in each joint controller, the received compensation torque values are converted to corresponding joint speeds for joint control.

The invention discloses an in-loop simulation system of the double-diesel engine propulsion control hardware of a ship, and the system comprises a diesel engine simulation test bench, a diesel engine monitoring and alarm system, a right diesel engine control console, a diesel engine rotating speed comprehensive control system and a left diesel engine simulation control system; the diesel engine simulation test bench and the diesel engine monitoring and alarm system respectively communicate with the right diesel engine control console through a point to point interface (PPI) protocol; the diesel engine rotating speed comprehensive control system comprises an electronic speed governor and Siemens S7-1200 PLC, and the S7-1200 PLC communicates with the right diesel engine control console through a Modbus protocol; and the left diesel engine simulation control system mutually exchanges data with the S7-1200 PLC of the diesel engine rotating speed comprehensive control system through an OLE for process control (OPC) protocol. According to the in-loop simulation system of the double-diesel engine propulsion control hardware of the ship, a user can set different ship diesel engine parameters in the diesel engines, a gearbox signal simulation box and a touch screen as needed, and thus can simulate the operation of the diesel engines under different working conditions.

The invention belongs to the field of control over a motor, and provides a rotation speed control circuit and method for the motor. The rotation speed control circuit comprises a detection circuit used for obtaining the work currents of the motor, a single-chip microcomputer used for controlling the pulse frequency according to a current frequency table and the work currents to output pulse signals to a driving circuit of the motor, and the driving circuit used for controlling the rotation speed of the motor according to the pulse signals. According to the rotation speed control circuit and method for the motor, the detection circuit detects the work currents fed back by a motor end, after the work currents are analyzed and processed by the single-chip microcomputer, the single-chip microcomputer outputs the pulse signals to the driving circuit of the motor by controlling the pulse frequency, real-time control over the rotation speed of the motor is achieved, the utilization rate of the motor is effectively improved, the service life of the motor is prolonged, energy consumption is effectively saved, and meanwhile the noise of the motor is lowered.

The utility model relates to a double-stage matrix converter for Mega Watt wind turbine, belonging to the technical filed of wind turbine, and comprising a motor side converter and a net side converter. The utility model is characterized in that the motor side converter and the net side converter are respectively formed by connecting three-phase bridge type arms in parallel which consist of six double-direction switches with same structure. Each double-direction switch is formed by reversely connecting the common emitters of two insulated double-stage transistors in series or reversely connecting the common connectors of two insulated double-stage transistors in series. The motor side converter and the net side converter are back-to-back connected with each other through a DC bus-bar. The utility model has the advantages of good input and output performance, reversible energy transmission, no energy storing element needed in the DC link, real time control on the rotation of the wind turbine motor unit and adjustable input and output power factors of the motor unit.

Disclosed is a fuzzy-control-based soft abrasive flow grain processing method. The method comprises that the current temperature of soft abrasive grains is measured and obtained by a temperature sensor inside a liquid storage groove, and the optimal velocity under the current temperature is calculated in accordance with a temperature-optimal velocity formula; the optimal velocity is output to a fuzzy controller and serves as a velocity specified value of the fuzzy controller, the current flow velocity is obtained through measurement of a speed sensor, the current flow velocity serves as a feedback amount of the fuzzy controller to be input, the output amount is a variable quantity of voltage frequency and an executive mechanism is a frequency converter; and the frequency of the input voltage of a pump is changed through the frequency converter, the rotary velocity is changed, the flow velocity of the soft abrasive grains is controlled and the soft abrasive grain flow processing is achieved. The invention also discloses a system. By the aid of the system, the soft abrasive flow grain processing method can be achieved. Accordingly, the flow velocity controlling accuracy is high and the processing efficiency is improved.

The invention discloses a self-sealing variable-frequency oil gun, which comprises an oil inlet and a self-sealing structure, wherein the self-sealing structure comprises a gating membrane; a self-sealing top cover is arranged above the self-sealing structure; a volume pump in an oiling machine hydraulic system is connected with the oil inlet of the oil gun; and an oiling machine variable-frequency control device in the oiling machine hydraulic system, a frequency converter, an oil pumping motor and the volume pump are connected in sequence. The self-sealing variable-frequency oil gun is characterized in that: the oil gun is provided with a control signal input device; the control signal input device is electrically connected with the oiling machine variable-frequency control device; a limiting switch is arranged from the self-sealing top cover to the inside of the oil gun; the top of the limiting switch is positioned on the self-sealing top cover; the bottom of the limiting switch ispressed against the top of the gating membrane; and the limiting switch is electrically connected with the variable-frequency control device. A control method of the oil gun comprises the following steps of: controlling the magnitude of the oil output of the oil gun through an input signal; and judging whether the self-sealing structure is in self-sealing state to control whether to stop the oil pumping motor. The oil gun has a good energy-saving effect and high safety performance.

The invention provides a control system and a control method for a pelletizer. The system comprises a pelletizer, a water supply device, a feeding belt weigher, a rotating speed controller, an inclination angle controller, a water controller, a material controller and a central processing unit; the central processing unit is configured to execute the following steps that according to the rotating speed of a pelletizer, the inclination angle of a pelletizing disc of the pelletizer, the feeding amount, the water feeding amount, the variety and proportion of all components in a mixture, the proportion of a binder in the mixture and the original moisture rate of the mixture, the qualified rate of green pellets is predicted, and predicted values of the qualified rate of green pellets in multiple prediction periods are obtained; the rotating speed of the pelletizer, the inclination angle of a pelletizing disc of the pelletizer, the feeding amount and the water feeding amount are optimized by adopting a rolling optimization model in combination with the predicted value of the qualified rate of the green pellets and a preset target value of the qualified rate of the green pellets; and therefore, the rotating speed of the balling machine in the balling machine, the inclination angle of the balling disc of the balling machine, the feeding amount provided for the balling machine and the water feeding amount provided for the balling machine are controlled in real time.

The invention belongs to the field of tailing water treatment, and specifically relates to a system and a method for controlling the rotating speed of a rake of a thickener in real time. The system comprises a flow meter, a concentration meter, a PLC (Programmable Logic Controller), an upper computer and a frequency converter, wherein the flow meter and the concentration meter are arranged on a feeding pipe of the thickener and are used for monitoring real-time flow data and real-time concentration data of ore pulp and transmitting signals to the PLC; the PLC is capable of calculating an appropriate rotating speed of the rake of the thickener according to a set thickener rake rotating speed control algorithm and displaying the appropriate rotating speed on the upper computer, and meanwhile, the PLC is used for transmitting a thickener rotating speed control signal to the frequency converter; the frequency converter is connected with a rotating motor of the rake of the thickener. The rotating speed of the rake is changed, real-time control on the rotating speed of the rake can be realized, a rake pressing accident can be effectively prevented, and the working efficiency of the thickener is iimproved.

The invention discloses a heat dissipation device provided with a heat dissipation fan and used for an electrical device, and belongs to the technical field of heat dissipation. The electrical device comprises a body and a chip fixed on the body, and a heat conduction silica gel gasket, a heat dissipation module and the heat dissipation fan are sequentially arranged at the other side, opposite to the body, of the chip; the heat dissipation device further comprises a PLC and a thermocouple, a temperature sensing probe of the thermocouple is fixed to the surface of the chip, and the PLC is electrically and separately connected with the thermocouple and the heat dissipation fan. According to the present invention, the heat conduction silica gel gasket, the heat dissipation module and the heat dissipation fan are combined for use, compared with a traditional aluminum extrusion heat dissipation structure, under the same conditions, the heat dissipation efficiency is high, heat dissipation is uniform, the heat accumulation can be effectively reduced, and the heat in a high-temperature area can be rapidly conducted out and transmitted to the heat dissipation module, and the heat on the heat dissipation module is taken away through the heat dissipation fan, so that the heat dissipation efficiency is higher, and the application field is wider.

The invention relates to a relay connection device (3) for forced ventilation equipment (1) having relay fan(s) (8), which includes a duct assembly (6) forming an inner channel (6c) of which the ends (6a, 6b) are open and provided with attachment means (13c, 14c) designed for a sealed connection between a so-called upstream line section (7) and a subsequent line section (7) provided with a relay fan (8), so as to establish fluid communication therebetween, the duct assembly (6) also being provided with means (9) for measuring at least one parameter of the flow with a view to controlling the operation of the relay fan (8) so as to obtain the desired flow conditions at the end of the upstream line section (7). The invention also describes a relay connection system (2) including said relay connection device (3) and forced ventilation equipment (1) including such relay connection systems (2).

The invention discloses a real-time monitoring system for a workshop enamelling machine, and the system achieves the networking monitoring of the workshop enamelling machine, and achieves the centralized management. One person can carry out the real-time management of a plurality of devices at a monitoring center, thereby reducing the manpower cost. The system comprises a single enamelling machine control module, a workshop enamelling machine networking module and a control room real-time monitoring module, and employs a CAN bus communication mode. The single enamelling machine control module comprises a temperature control meter group, a frequency converter group, an I/O module and a controller, wherein the temperature control meter group, the frequency converter group and the I/O module are respectively connected with the controller. The workshop enamelling machine networking module comprises a workshop control room industrial control computer PCI-CAN board card, and the workshop control room industrial control computer PCI-CAN board card communicates with the controller through a CAN bus. The temperature control meter group comprises a circulating wind temperature control meter, a post-catalysis temperature control meter, a fore-catalysis temperature control meter, an outlet temperature control meter, a central temperature control meter, and an inlet temperature control meter. The frequency converter group comprises a temperature adjustment fan, a circulating fan, a waste discharge fan, a left constant-speed motor, a right constant-speed motor, a left tension motor, and a right tension motor.

The invention discloses an emergency braking mechanism applied to an adjusting shaft, and relates to the field of adjusting shafts, the emergency braking mechanism comprises a middle rail and extension mechanisms, folding cavities are symmetrically and fixedly installed on the two sides of the middle rail, the extension mechanisms are symmetrically and rotatably installed at the upper ends and the lower ends of the folding cavities, and each extension mechanism comprises a wing plate, a rotating pin, a sleeve, a ratchet wheel, a shaft rod, a first wrench and a pawl. The problems that a bearing seat serves as a device for externally supporting an adjusting bearing, a bearing seat in the current market is simple in structure and single in function, can only achieve the effect of installing and supporting an adjusting shaft, is deficient in function, generally does not have a braking effect, and needs to wait for stopping the adjusting shaft in the frequent machining process, so that the production cost is high, and the like are solved. The invention provides an emergency braking mechanism applied to an adjusting shaft, which aims at solving the technical problems that the existing adjusting shaft has a certain limitation due to the influence on the machining working efficiency, provides a self-lubricating capability for a bearing seat, prolongs the service life of the bearing seat, and also provides the bearing seat with the functions of adapting to different specifications of adjusting bearing loads and braking.

The invention discloses a gas pretreatment pressurizing device, and relates to the correlative technical field of gas pretreatment. The gas pretreatment pressurizing device comprises a device body. Agas inlet cavity and a gas outlet cavity are formed in the two sides of an inner cavity of the device body. A first installation groove is formed in the lower end of the middle of the device body, anda second installation groove is formed in the upper end of the middle of the device body. The invention further discloses a control method of the gas pretreatment pressurizing device. The control method comprises eight steps. Stable operation of a plurality of parallel roots blowers can be effectively guaranteed, and the effects of economical operation and stable operation are achieved. Accordingto the gas pretreatment pressurizing device, the first installation groove and the second installation groove are formed in the device body, a variable-frequency motor is fixedly installed in the first installation groove, the roots blowers are fixedly installed in the second installation groove, and therefore the variable-frequency motor and the roots blowers can be conveniently installed and replaced, and the working efficiency of the pressurizing device is improved.