In view of magnetostriction Displacement sensor It depends on the precise pulse that it works. Therefore, it is necessary to provide certain conditions for the use of the clock in the controller to synchronize with the corresponding frequency of the sensor.
In the instrument and electrical control system, according to the process requirements of the control object, it is often necessary to convert some physical quantities, such as process parameters, equipment position and status, into electrical signals that can be controlled by the system, so as to control or display their values. This is what the sensor does. The sensor introduced in this paper, which uses the principle of magnetostriction to detect displacement, belongs to the detection device of position signal conversion. The sensor has high precision and high reliability, which has been widely recognized in the world, and has thousands of successful application cases. Because the sensor is non-contact measurement, by detecting the displacement of the movable magnet which is integrated with the piston rod of the hydraulic cylinder, and the magnet has no direct contact with the detection part of the sensor, the sensor is very suitable for working in extremely harsh industrial environment, such as the environment easily contaminated by oil, solution, dust or other substances, and will not pose a threat to the sensor. In addition, the working principle and structure of the sensor determine that it is more able to withstand high temperature, high pressure and high vibration environment. The output signal of the sensor is absolute value, so even if the power supply is interrupted, it will not pose any problem to the previously detected data, let alone return to zero again. In addition, because the sensitive detection elements are non-contact, even if the sensing process is repeated, it will not cause any wear to the sensor. According to the German space agency statistics, germanjet Displacement sensor The average time between failures of the magnetostrictive sensors is 23 years.
There are also some problems in the assembly of hydraulic cylinder
First, the machining dimension of the assembly part shall be controlled according to the tolerance requirements in the figure below.
Second, during assembly, it should be noted that if the hydraulic cylinder is made of ferromagnetic materials, the magnetic isolation washer made of non-magnetic material should be padded on the lower part of the sliding magnetic ring when installing the sliding magnetic ring, and all the screws fixing the sliding magnetic ring must be made of non-magnetic materials.
In addition, attention should be paid to the effective working area of displacement sensor. The actual measurement range should be placed in the effective measurement area of the sensor. Due to the presence of the sensor at both ends of the structure. Please refer to the figure for details. According to the data, the dead zone of 19h sensor, that is, the front end of the measuring rod, is 63.5mm for the measuring range of 5m, and 66mm for the measuring range of 5m to 7.6m.