Control function of laser measuring instrument

The outer diameter of the cable mainly depends on the extrusion flow rate of the plastic and the main traction speed of the system. When the system operates stably, the main traction speed reaches the set value, and the outer diameter only depends on the extrusion flow rate of the plastic: when the flow rate increases, the outer diameter increases, whereas the outer diameter decreases. When the system operates at variable speed, the rotation speed of the extruder screw is adjusted to change the plastic flow rate to maintain the wire diameter. The tractor is the opposite.

The single axis caliper adopts PID adjustment function to control the wire diameter. The on-line measuring instrument is used to measure the outer diameter of the product, calculate the deviation between the wire diameter and the set nominal value, and control the screw speed of the extruder or the speed of the tractor through the regulator to make the actual wire diameter as close as possible to the nominal value. The outer diameter feedback control system has a time lag characteristic, and its typical value is 1-10 seconds. The feedback control can not eliminate or reduce the rapid fluctuation whose change period is shorter than the delay time of the system. According to the actual response of the system, the calculation system realizes the real-time and optimal adjustment of PID parameters. The selection of PID initial parameters is related to the stability and adjustment time of the control system. Appropriate PID initial parameters can not only ensure the stability of the system, but also shorten the transition process time and improve the dynamic response characteristics.

For the measurement of the long and short axis dimensions, the wire rod caliper adopts an eight axis probe, the distance between the measuring points is 22.5 ° circular arc, and the projection of the measuring instrument is "insensitive" at 11.25 °. From simple geometric calculation, it can be seen that this point mainly has a projection of more than 1% of its diameter, and its projection will be found to block the projections in the two adjacent directions. The difference between the projection of this projection data and the projection of the diameter and outer diameter is less than 1%, and the difference between the projection of this projection data and the projection of the diameter and outer diameter is less than 1% For the measurement of the same section and the slight torsion of the measured object, the measuring instrument can quickly find the product defects and size fluctuations, and find the process problems in production in real time. At the same time, it can detect eight directions, measure the major and minor axis dimensions, and calculate the ellipticity dimension.

For steel rolling production, the wire rod caliper brings not only the convenience of outer diameter dimension detection, but also its various functions are very friendly to the staff. The image display of cross-section diagram, trend diagram, defect diagram and wave diagram is very intuitive, and it can detect the common defects of round steel, such as "ear", "wrong roll", etc.

The wire rod caliper has been used in wire rod workshops of many iron and steel plants. According to the actual use on the site, even though there is much dust and water vapor on the site, the instrument can still work normally under serious interference such as motor, crown block and electric welding machine.