Currently known guy wire Displacement sensor Its principle is to convert the linear displacement into an angle for measurement. It is composed of a line angle converter for winding wire and an angle sensor for measuring, which are connected by a coupling device. The wire rope passes through the hole on the sensor shell and connects with the winding wheel in the shell. The winding angle is measured by the angle sensor. The length of the winding line represents the elongation of the pulling wire, which can be calculated according to the diameter of the winding wheel and the winding angle. Angle measurement sensor generally uses multi turn potentiometer or rotary encoder, but these electronic devices have poor water resistance and pull wire Displacement sensor When in water, the external water will enter into the angle sensor through the threading hole, which will cause electrical failure. Therefore, this kind of pull wire displacement sensor can not be used in water.
Contents of utility model
In order to overcome the disadvantage that the angle sensor in the existing pull wire displacement sensor can not be used in water, the utility model first adopts a fully sealed structure for the angle sensor, so that the angle sensor has waterproof function and can be used in water. At the same time, the magnetic coupling coupling coupling method is used to connect the line angle converter and the angle sensor instead of the traditional coupling method, so as to realize the sealing isolation between the two.
The utility model is composed of a wire rope and a displacement transducer, which is composed of a wire rope and a displacement sensor. The angle measuring device is composed of angle sensor, bracket, magnet and signal cable, and is sealed in another stainless steel shell. The stay wire rope passes through the stainless steel shell of the line angle converter and is wound on the winding wheel. The winding wheel rotates and the winding angle has an accurate linear relationship with the elongation of the stay wire. The winding wheel of the line angle converter is a double shaft extension. One end of the shaft is equipped with a magnet and the other end is equipped with a reaction spring. The angle measuring device is composed of angle sensor, bracket, magnet and signal cable, which is sealed in another stainless steel shell. Another magnet is installed on the rotating shaft of the angle sensor. The output voltage signal of the angle sensor is connected with the outer body of the shell with a waterproof cable, and the cable outlet is fixed on the shell of the angle measuring device with a sealing clamp. Because the angle measuring device is sealed, when placed in the water, the angle sensor and other electronic components are completely isolated from the water, which ensures the reliable operation of the sensor.
Through a connecting plate, the line angle converter and the angle measuring device are connected together, so that the magnets on the two rotating axes are on the same axis, forming a magnetic coupling coupling coupling mechanism. When the stretching and stretching of the stay wire rope causes displacement, the wire angle converter rotates the winding wire, and through the magnetic attraction on the shaft, the rotating shaft of the angle sensor is pulled to rotate synchronously, and the rotation angle of the line angle converter, that is, the telescopic displacement of the stay wire, is converted into the rotation angle of the angle sensor for electrical measurement. The displacement of stay wire can be calculated according to the linear relationship between the stretching length of stay wire and the voltage of angle measurement.
The utility model has the beneficial effect that the pull wire displacement sensor can measure underwater, and the depth of the installation point can reach 100 meters.
Description of drawings
The implementation mode of the utility model is further explained in combination with the attached drawings
In Figure 1: 1. Wire angle converter housing, 2. Winding wheel, 3. Reaction spring, 4. Wire rope stay wire, 5. Magnet, 6. Angle measuring device housing, 7. Angle sensor, 8. Magnet, 9. Cable, 10. Angle sensor bracket, 11. Connecting disc, 12. Cable clamp, 13. Bearing.
Specific implementation mode
In Fig. 1, the stainless steel wire rope (4) passes through the stainless steel shell (1) and is horizontally wound on the winding wheel (2). The winding wheel is of double shaft extension and is supported and rotated by two bearings (13). One end of the double shaft extension is connected with the reaction spring (3),
The other end is provided with a magnet (5), and the above structure is packaged in a stainless steel shell (1) to form a line angle converter. The angle sensor (7) is first installed on the bracket (10) and then fixed on the connecting plate (11). The rotating shaft of the angle sensor is provided with a magnet (8). The output signal of the angle sensor is led out with a cable (9), and the outlet hole is fixed with a cable clamp (12). The above structure is sealed in a stainless steel shell (6) to form an angle measuring device. The wire angle converter housing (1) and the angle measuring device housing (6) are connected to form an underwater pull rope displacement sensor through the connecting plate (11).
So as to realize: the stretching and stretching displacement of the stay wire rope generates displacement, which makes the winding wheel rotate, and the magnet on the winding axle rotates at the same time. The magnetic coupling pulls the magnet on the angle sensor shaft to rotate synchronously. The angle sensor converts the linear displacement of the steel wire rope into the angle voltage signal and outputs it from the cable line Through calibration calculation, the stretching displacement value of stay wire rope can be obtained.