Principle and application of drawstring displacement sensor
The rope displacement sensor is also called a rope sensor. It is a new and simple length displacement sensor with a wide range of applications, such as compact structure, long measuring stroke, small installation space, high measurement accuracy, good reliability, long life and low maintenance. In addition, the cable displacement sensor is easy to install and use, and is suitable for many dangerous applications, widely used and measured. This paper mainly introduces the working principle of the rope displacement sensor and the precautions when installing the cable displacement sensor. 
The working principle of the rope displacement sensor The function of the rope type displacement sensor is to convert the mechanical motion into an electrical signal that can be measured, recorded or transmitted. The cable displacement sensor is wound by a stretchable stainless steel wire on a threaded hub that is connected to a precision rotary sensor. The sensor can be an incremental encoder, an absolute (independent) encoder, mixed or Conductive plastic rotary potentiometer, synchronizer or resolver.
In operation, the drawstring displacement sensor is mounted in a fixed position and the drawstring is attached to the moving object. The linear motion of the drawstring is aligned with the axis of motion of the moving object. When the movement occurs, the drawstring stretches and contracts. An internal spring ensures that the tension of the drawstring does not change. The threaded hub drives the precision rotary sensor to rotate, outputting an electrical signal proportional to the distance the cable moves. Measuring the output signal can give the displacement, direction or velocity of the moving object.
Common parameters of the rope displacement sensor commonly used parameters are measurement stroke, output signal mode, linearity, repeatability, resolution, wire diameter specification, outlet pull force, maximum round trip speed, weight, input resistance value, power, working voltage, working temperature , vibration, protection level, etc.
Drawstring displacement sensor signal output mode The cable displacement sensor signal output mode is divided into digital signal output and analog signal output. The digital output type can select incremental rotary encoder, absolute encoder, etc., and the output signal is square wave ABZ signal or Gray. The code signal can achieve a stroke of up to 10000 mm, a linear accuracy of up to 0.01%, and a resolution of up to 0.001 mm/pulse depending on the configuration.
The analog output type can be selected from precision potentiometer, Hall encoder, absolute encoder, etc. The output signal can be 4-20 mA, 0-5 volts, 0-10 volts, serial SSI and resistance signal, etc. It can reach 12500 mm, and the maximum operating environment can reach IP65 protection level, and it can be used in a wide temperature range of -45 °C to +105 °C.
The drawstring displacement sensor classification drawstring displacement sensor is divided into two product categories: digital output type and analog output type. Suitable for linear guide system, hydraulic cylinder system, telescopic system, storage position positioning, pressure machinery, paper machinery, textile machinery, sheet metal machinery, packaging machinery, printing machinery, level control instrument, construction machinery and other related dimensional measurement and position control. It is also widely used in the screen display and digital display systems of the testing machine industry. The cable-type displacement sensor can be customized for other applications. In addition, the rope displacement sensor can completely replace the scale and electronic scale to achieve low-cost high-precision measurement.
Use installation considerations
1. Use the bottom 4 fixing screw holes to install directly or add protection or other mechanical use according to the needs of the site and machine installation space facilities.
2. When installing the stainless steel cable, pay attention to the horizontal angle, that is, the mechanism that makes the cable from the outlet to the moving part as far as possible, and slide horizontally during operation to maintain the minimum angle (tolerance +/- 30) to ensure the measurement accuracy and The life of the cable.
3. The steel cable body is made of stainless steel and coated with fluorine layer. Do not let it be damaged by external force, burning, impact, etc.: Excessive dust, accumulated debris or items sufficient to damage the cable are stored inside. The pulley or the outlet will cause the cable to be damaged, resulting in a malfunction.
4. If it is not installed on the workbench or in front of the fixed seat, please do not pull the steel cable by hand or other products and let it bounce back in time. This will cause the cable to break, damage the body structure and personal safety.
5. The instantaneous acceleration of the reciprocating motion of the MPS-S and MPS-M series products must not exceed 1 m/s; the instantaneous acceleration of the reciprocating motion of the MPS-L and MPS-LP series products must not exceed 0.5 m/s; Will cause the cable to break, the company will not be responsible for this outside the scope.
6. If using a mechanism that is not linear, please install the appropriate pulley.
7. If it is used in harsh environments or special occasions, please install a protection mechanism or contact the manufacturer to avoid loss.
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