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Development of large-scale explosion-proof butterfly valve electro-hydraulic servo adjustment device
With the development of China's petrochemical industry, the valve industry butterfly valve products continue to grow in caliber, has reached 1m and even a few meters in diameter. For large-diameter valves need to open and close the torque and speed, the valve control in addition to manual, pneumatic and electric drive form, hydraulic transmission and control has also been widely used. In order to make the butterfly valve adjusting device meet the requirements of large-scale coal power station, thermal power plant and petrochemical industry with larger torque, the electro-hydraulic servo proportional control quick closing adjustment device of large explosion-proof butterfly valve was developed. The device adopts electro-hydraulic servo proportional control technology, 1/600, the maximum execution torque of 100000N · m. 2, the system structure Large-scale explosion-proof butterfly valve electro-hydraulic proportional servo speed control device is adjusted to meet the growing needs of the petrochemical industry developed a new product. Mainly by the explosion-proof control cabinet, large diameter butterfly valve, hydraulic servo control system, mechanical transmission and electrical control system components. 2.1, hydraulic servo control system Hydraulic servo control system consists of gear pumps, motors, couplings, electro-hydraulic servo proportional valve, three four-way solenoid valve, relief valve, check valve, throttle, accumulator , Pressure relays, pressure gauges, high pressure filters and fuel tanks and other components. System uses an integrated modular design, the system safety pressure set by the relief valve. Shut-off valve (HV5) role is to release the system pressure oil back to the tank, the throttle valve is used to adjust the system open and close the valve speed, pressure relay set the system hydraulic control upper and lower limits, the pump adopts imported high pressure and low noise gear Pumps, vertical installation, the use of imported valves threaded valve cartridge system greatly reduce the internal leakage, save energy, easy maintenance and installation. Filter with inverted high-pressure filter, compact structure to ensure that the system clean oil and various control valves can be normal operation. The high-performance electro-hydraulic servo proportional valve is a sliding sleeve structure, and the four-way valve spool in the proportional valve can slide in the sliding sleeve. Sliding sleeve into the valve body, the center of the spring so that the valve spool to maintain the neutral position, the linear force to overcome the spring force of the valve so that the spool in both directions can deviate from the middle position, balanced in a new position. The spool is controlled by a closed-loop position control of a proportional solenoid integrated with an inductive electronic sensor. Closed-loop spool valve position control electronics and pulse width modulation drive circuit curing into an integrated block, fixed in the servo valve. When an electrical command signal is applied to the spool position control manifold, the electronics produces a pulse-width modulated current at the linear force motor and the oscillator energizes the spool position sensor. After the demodulation of the spool position signal and the command signal to compare the spool position controller to produce current output to the linear motor, linear motor drive spool to the command position. Spool position and the command signal is proportional. When the spool moves so that the pressure oil P and A or B cavity interlinked, the pressure oil quickly into the cylinder A or B cavity, through the rack and pinion to promote the butterfly valve to complete the opening and quick closing and other regulatory actions. Hydraulic servo drive torque of 25 ~ 100kN · m, provided by the hydraulic pump hydraulic power station, to promote the implementation of the butterfly valve to complete 0 ° ~ 90 ° opening and closing movements. The top of the gearbox spindle is equipped with electronic angular displacement detection device, which can correctly detect the opening and closing angle of the butterfly valve and send out a signal in time to instruct the electrical system to stop the opening and closing movement of the oil cylinder with the control precision of 1/600. When the power is cut off, the actuator can also manually open the butterfly valve drive mechanism. The manual drive mechanism has a gear ratio ≈ 1/138 and a maximum torque of 5 kN · m. Butterfly valve opening and closing angle through the gear box at the top of the angle indicator pointer in the disk visually determined. More Keywords Search: Butterfly valve