Pull rope displacement sensor working principle and installation notes
1. Working principle and common parameters of pull rope displacement sensor The function of pull rope type displacement sensor is to convert mechanical motion into electric signal that can be measured, recorded or transmitted. The pull-rope displacement sensor is wound on a threaded hub made of a stretchable stainless steel wire. The hub is connected to a precision rotating sensor. The sensor can be an incremental encoder, absolute (stand-alone) encoder, hybrid or Conductive plastic rotary potentiometer, synchronizer or resolver.
In operation, the pull-rope displacement sensor is mounted in a fixed position and the pull rope 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 drawstring tension does not change. The threaded hub drives the rotation of the precision rotary sensor and outputs an electrical signal that is proportional to the distance the rope moves. Measuring the output signal gives the displacement, direction, or velocity of the moving object.
Common parameters include measurement stroke, output signal mode, linearity, repeatability, resolution, wire diameter specifications, outlet outlet tension, maximum round-trip speed, weight, input resistance, power, operating voltage, operating temperature, vibration, protection rating, etc. .
2, pull rope displacement sensor signal output method Rope displacement sensor signal output is divided into digital signal output and analog signal output, digital output type can choose incremental rotary encoder, absolute encoder, etc., the output signal is square wave ABZ signal Or Gray code signal, the maximum stroke can be achieved 10000 mm, the maximum linear accuracy of 0.01%, the maximum resolution can reach 0.001 mm / pulse according to the configuration.
Analog output type can choose precision potentiometer, Hall encoder, absolute encoder, etc. The output signal can be 4-20 mA, 0-5 V, 0-10 V, serial SSI and resistance signal, etc. It can reach 12500mm, use environment can reach IP65 maximum protection level, -45°C～+105°C wide temperature environment.
3, the use of installation precautions 1. Use the bottom of the four fixed screw holes, according to the site and machine installation space facilities, direct installation or additional protection or other mechanical use.
2. When installing the stainless steel cable, attention should be paid to the horizontal angle, that is, the mechanism that makes the cable from the outlet to the moving part as much as possible, slide horizontally during operation to keep the minimum angle (tolerance +/- 30) to ensure measurement accuracy and The life of the steel cable.
3. The wire rope body is stainless steel coated with fluorine layer, do not allow it to be cut by the external force, burning, impact and other improper things happen: excess dust, accumulated debris or enough to destroy the wire rope stored in the internal The pulley or outlet will cause damage to the cable, leading to unsatisfactory operation.
4 is not installed on the table or fixed seat, do not pull the cable with your hand or other products and let it spontaneously rebound. This will cause the wire 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 MPS-L and MPS-LP series products must not exceed 0.5 m/s; The wire will be broken and the company will not assume responsibility beyond this scope.
6. If used in non-linear motion agencies, please install the appropriate pulley operation.
7. If used in harsh environments or special occasions, please install protection agencies or contact the manufacturer to avoid loss.
Pull-rope displacement sensors are divided into digital output and analog output two product categories. Suitable for linear guide systems, hydraulic cylinder systems, telescopic systems, storage location positioning, pressure machinery, papermaking machinery, textile machinery, sheet metal machinery, packaging machinery, printing machinery, level control instruments, construction machinery and other related size measurement and position control. In the testing machine industry screen display, digital display system is also more widely used, other applications can be customized pull rope displacement sensor. In addition, the pull rope displacement sensor can completely replace the grating ruler and electronic ruler to realize low-cost high-precision measurement.
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