On-line detection and control of outer diameter of cable core insulation

introduction

The high-speed, high-quality and intelligent cable core production line is the basis for ensuring the quality and production speed of wire and cable products. Timely and accurate online measurement of the core diameter, capacitance, eccentricity and other important parameters is necessary to ensure stable production of the production line, various online measuring instruments such as: caliper, capacitance measuring instrument, eccentric measuring instrument, surface defect measurement Instrumentation is the key to the advancement of intelligent cable production lines. This article mainly introduces the wire diameter of the cable core measured by the caliper.

The insulation of the core is formed by extruding the molten insulating material on the conductor by an extruder. The outer diameter of the core insulation is the most fluctuating among the core structure dimensions, so the monitoring of the outer diameter of the core is monitored. It is the top priority of production control. The insulation outer diameter of the cable core is usually used as the control basis for the linear speed of the whole core production line and the closed-loop control of the extruder screw speed. Therefore, it is of great significance to develop a high-speed and accurate diameter measuring instrument. Practice has shown that it is best to use a non-contact optical measurement system to ensure that the wire core insulation outer diameter can be measured without affecting the line speed and online.

1, cable caliper

The cable caliper uses the photoelectric method to carry out the precision measuring instrument for wire diameter size detection. The cable caliper is a single-group photoelectric probe for unidirectional measurement of the cable core. The photoelectric probe of the caliper is composed of a transmitting lens and a receiving lens. The light from the point source in the emitting lens passes through the emitting lens to form a parallel light field of view and is directed toward the receiving lens. The parallel light is then focused by the receiving lens and imaged on the receiving unit after passing through the pupil aperture at the focus position. When the object in the field of view passes through the object to be measured, the portion blocked by the object to be measured will have a sharply defined shadow on the chip of the receiving unit. Through photoelectric conversion and digitization, the diameter of the measured object can be calculated by the width of the shadow.

The cable caliper is a non-contact on-line inspection device. The cable core passes through the parallel optical field of view, and the caliper can be used to obtain the wire diameter. And the caliper adopts high-frequency measurement system. The measurement frequency can be measured at 500Hz, that is, 2ms. It can be used for on-line detection of wire diameter size on high-speed high-quality intelligent cable core production line.

2. Insulation outer diameter detection and control of wire core

The insulation of the core is formed by extruding the molten insulating material on the conductor by the extruder, and is also very easy to fluctuate. The size of the cable core insulation is detected and real-time control can be achieved, and the yield of the cable core is achieved. And quality assurance has great significance. To this end, a PID control system is added to the cable caliper.

The PID controller is simple and easy to understand, and requires no preconditions such as accurate system models in use, making it the most widely used controller. The cable caliper is controlled by an incremental PID control system, which can be used to insulate the cable core of the cable core in production by a built-in incremental PID system inverter, electronic governor, air compressor and other external devices. The diameter is precisely controlled. This system is reliable and convenient. It is an ideal choice for cable calipers. The cable caliper uses an incremental PID control system that can be connected to a variety of external devices to form a closed loop control.

The outer diameter of the insulation of the cable core is mainly determined by the extrusion flow rate of the molten insulation and the main traction speed of the system. When the system is running stably, the main traction speed reaches the set value, and the outer diameter depends only on the extrusion flow rate of the plastic: the flow rate increases, the outer diameter increases, and the outer diameter decreases. The speed of the extruder screw is adjusted during the system's variable speed operation to change the plastic flow rate to maintain the wire diameter. It is also possible to control the tractor in the same way, just as opposed to controlling the extruder.

Conclusion

The process time of using the PID controller is more precise than the outer diameter of the cable core insulation, which greatly reduces the wire diameter failure rate of the cable core, and its response speed and anti-interference performance are very good. Widely used in the detection and control of wire diameters of cables, cables, etc.

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