1. The application of displacement sensor in the shield machine
In the tunnel construction equipment, the structural characteristics and supporting facilities of different forms of shield machines are also different. In some messy shield machines, the functions of the shield machine are systematic and diversified. Including: mechanical, hydraulic, measurement and control and other functions. For example, on some composite shield machines, there are various functions such as excavation system, main drive system, propulsion system, grouting system, hydraulic system and so on.
As a linear sensor, the displacement sensor is mainly used to measure the mechanical displacement in the linear azimuth, and each group of cylinders in the shield machine propulsion system is equipped with a displacement sensor to measure the displacement data when the cylinder is pushed.
2. The application of magnetostatic grid displacement sensor in elevator control system
The role of the magnetostatic grid displacement sensor in the elevator control system is the adjustment of the elevator leveling control, and the electronic control system is the "central nervous system" of the elevator.
The magnetostatic gate displacement sensor is a combination of two parts: the "magnetostatic gate source" and the "magnetostatic scale". The "magnetostatic grid source" uses aluminum alloy sealed passive NdFeB magnetic grid to form a magnetic grid coding array; The "magnetostatic scale" is encapsulated with a special high-strength aluminum alloy tube with an embedded microprocessor system, a Hall code array composed of a switch-type Hall sensor material, and an anti-oxidation plastic plating treatment is applied to the outside of the aluminum alloy tube.
When the "magnetostatic gate source" moves along the axis of the "magnetostatic scale" without touch (relative void tolerance and relative attitude tolerance up to 50mm), the digital displacement information is separated by the "magnetostatic scale", and the digital signal of displacement is directly generated by orders of magnitude higher than millimeters. Abundant resources of the embedded microprocessor are exploited, and the data update speed is increased to the order of milliseconds, so that the displacement response can be accustomed to the movement speed below 5m/s.
Because the operation of the elevator is controlled according to the call signal and travel signal of the floor and the car, and the call of the floor and the car is random, therefore, the system control adopts random logic control. That is, on the basis of completing the basic control requirements of the elevator with sequential logic control, the operation of the elevator is controlled in a timely manner according to the random input signal and the corresponding condition of the elevator.
In addition, the orientation of the car is confirmed by the magnetostatic gate displacement sensor and sent to the PLC counter to control it. Together, a magnetostatic gate source is set up on each floor to detect the floor signal of the system.
The magnetostatic grid displacement sensor is selected to complete the elevator leveling control. It can complete the intellectualization of elevator control, the elevator operation comfort is good, and the comfort of starting, deceleration and leveling does not change due to the change of car load.
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