System and method for controlling hydrological winch

Abstract

The invention discloses a system and method for controlling hydrological winch. The system comprises a programmable logic controller (PLC) control unit, a human machine interface (HMI) display setting unit, an emergency control contact unit, a rotary encoder, a frequency converter, a frequency conversion brake motor, a rotary drum speed reducer and an angle sensor. The HMI display setting unit is connected with the PLC control unit, the PLC control unit controls the emergency control contact unit and the frequency converter, the emergency control contact unit and the frequency converter are connected with the frequency conversion brake motor, the frequency conversion brake motor is connected with the speed reducer to drive the speed reducer to drive a rotary drum to work, the rotary encoder detects a state signal of the rotary drum speed reducer and transfers the state signal to the PLC control unit and the frequency converter, and the angle sensor transfers an angle signal to the PLC control unit. The system can accurately measure and calculate the length, the speed and relative water depth of a winding and releasing steel wire rope and accurately and stably delivers a device to a designated position to finish surveying and mapping operation.

Description

technical field [0001] The invention relates to a hydrological winch, in particular to a control system and method for retracting and unwinding a cable of a hydrological winch, and belongs to the technical field of ship hydrological measurement. Background technique [0002] As a hydrographic measurement equipment for ships, the hydrological winch is generally used on hydrographic survey ships in rivers. It is a special mechanical transmission lifting device for sending hydrological measurement equipment (lead fish) to designated detection points for hydrological sampling during hydrological testing. [0003] The hydrological winches in the prior art have the following series of problems: For example, the boom is mainly a rigid support structure boom, which requires a large space for actual installation and installation, and cannot be flexibly retracted; the drum adopts a multi-layer winding method, and the upper drum The length of the steel wire rope in each circle is diff...

AI Technical Summary

Problems solved by technology

[0003] The hydrological winches in the prior art have the following series of problems: For example, the boom is mainly a rigid support structure boom, which requires a large space for actual installation and installation, and cannot be flexibly retracted; the drum adopts a multi-layer winding method, and the upper drum The length of the steel wire rope in each circle is different, which cannot effectively guarantee the speed of retracting and unwinding the steel wire rope on site, and the actual length of the wire rope can not be accurately calculated; when calculating the relative water depth, the signal of the angle of entry of the wire rope into the water is not compensated, and the wire rope can only be roughly calculated. length, it is impossible to calculate the relative water depth position of the hydrological equipment at this time

In addition, the traditional hydrological winch cannot know immediately after the hydrological measurement device bottoms out. After the equipment bottoms out, it can only be judged by directly observing the tension degree of the steel wire rope, which causes a delay for a period of time after the measurement device bottoms out before judging that it has bottomed out. Lack of effective monitoring of the depth of the load lowering, continuous bottoming is easy to damage the measuring equipment

In the existing technology, a bottoming signal sensor is installed at the bottom of the equipment to judge whether it is bottoming, which requires additional underwater cables, and the steel wire rope and cables need to be retracted synchronously, which increases the manufacturing cost of the equipment and brings new problems to the system. Unreliable factors

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