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The reliability and accuracy of the pull rod displacement sensor stem from the precise coordination of multiple key components
Date: 2025-12-23Read: 22
Pull rod displacement sensor is a high-precision measuring device that converts linear displacement into rotational angle through flexible steel wire rope, and outputs electrical signals through internal encoder or potentiometer. Its compact structure, flexible installation, and wide range are widely used in fields such as engineering machinery, hydraulic gates, bridge monitoring, industrial automation, and testing equipment. The reliability and accuracy of the rod type displacement sensor stem from the precise coordination of multiple key components.
1、 Distance measuring wire rope and coil spring mechanism
High tensile steel wire rope: made of stainless steel multi strand twisted wire, coated with rust proof layer on the surface, with a diameter of usually 0.2-0.6mm, possessing high flexibility and low elongation (<0.01%), ensuring no lag in displacement transmission;
Hengli coil spring: Built in precision spring, providing constant winding tension (0.5-3N), ensuring that the steel wire rope is always taut and avoiding measurement errors caused by looseness.
2、 Rotary encoder/potentiometer
Incremental/absolute encoder: mainstream configuration, resolution up to 0.001mm, output digital signals such as RS485, SSI, CANopen, etc., strong anti-interference, long lifespan (>50 million cycles);
Conductive plastic potentiometer (economical type): outputs analog voltage (0-10V) or current (4-20mA), with low cost but short lifespan (about 1 million cycles), suitable for low-frequency applications.
3、 Shell and protective structure
The main body is made of die cast aluminum or stainless steel material, with a protection level of IP65/IP67, dustproof and waterproof, resistant to oil stains, vibration and impact;
The outlet is equipped with waterproof joints, and the steel wire rope outlet is equipped with a sealed guide sleeve to prevent sediment and water vapor from entering the internal mechanism.
4、 Guide wheel and installation bracket
External high hardness ceramic or engineering plastic guide wheels to reduce wire rope wear and ensure that the pulling direction is consistent with the sensor axis;
The bracket supports multi angle adjustment, making it easy to align the motion trajectory of the measured object on site and avoiding damage to the internal bearings caused by lateral forces.
5、 Signal processing and output module
Built in signal conditioning circuit, supporting zero calibration, range setting, and filtering parameter adjustment;
Some models integrate temperature compensation algorithms to eliminate the impact of environmental temperature changes on mechanical dimensions and improve long-term stability.