The function of the elevator traction system is to output and transmit power to drive the elevator. It is mainly composed of traction machine, traction wire rope, guide pulley and reverse sheave. The towing machine provides power for the operation of the elevator, which is composed of motor, towing wheel, coupling, reducer and electromagnetic brake. Both ends of the pulling wire are connected to the lift car and counterweight respectively, and the lift car is driven up and down by the friction between the wire rope and the pulling wheel. The guide wheel is used to separate the space between the lift car and the counterweight. The use of compound winding type can also increase the drag force. Professional Elevator Traction System manufacturer is located in China, including Traction Elevator System,Traction Lift System,Traction Elevator, etc. Elevator Traction System,Traction Elevator System,Traction Lift System,Traction Elevator Suzhou Stable Trade Co., Ltd , https://www.stable-elevator.com
Electric control valve main performance and testing
Electric control valve main performance and test: electric control valve main performance indicators are: basic error, backlash, dead zone, the rated stroke deviation, leakage, sealing, compressive strength, appearance, rated flow coefficient, the inherent flow characteristics, resistance Vibration, temperature, long-term reliability, explosion-proof, damping characteristics, changes in power supply voltage, environmental temperature changes, insulation resistance, dielectric strength and so on. The first 10 indicators of the requirements and test methods are the same or similar with the pneumatic valve, in which the basic error, backlash, dead zone, leakage, sealing, appearance, damping characteristics, power supply voltage changes, the insulation resistance of the factory test items, 3 performance requirements and test methods are as follows: 1) Damping characteristics Damping characteristics of the electric control valve, in both positive and negative direction of the provisions of the stem does not exceed 3 "half-cycle" swing. The test method is to input the input signal range value of 20%, 50%, 80% of the signal to observe the valve stem in the positive and reverse stroke corresponding position "half-cycle" number of oscillations. 2) Changes in power supply voltage When the supply voltage of the electric regulating valve changes within the range of 220 + 20-30V, the displacement of the stem should not exceed 1.5% of the full stroke. The test method is to measure the corresponding stem stroke value of the signal of 20% of the signal range value at the input voltage of 220V and adjust the power supply voltage to 190V and 240V to measure the corresponding stem stroke change value . Then turn on the signal range value of 50%, 80% of the signal, measure the valve stem travel changes. 3) Insulation resistance When the ambient temperature is 10 ~ 35 ℃, the relative humidity does not exceed 85%, the insulation resistance of the electric control valve should meet the following requirements: the input terminal to the chassis is not less than 20MΩ; each input terminal to the power supply terminal is not less than 50MΩ; power terminals on the chassis is not less than 50MΩ. Test method is the use of 500 megohmmeter test.