The Design And Researth Of The Winch General Parameters Testing Instrument

In order to make sure the trouble-free operation, the device of the winch not only offers the power to the cable, but also collects the depth, velocity and tension of the cable in the silo operating such as well logging, perforation and repair. The logging instrument our country introduced earlier adopted digital logic circuit which has a low integrated level. Recently the logging instrument our country introduced is special in several aspects such as screen display, operational application and the external appearance. With the rapid development of the science and the technology, it's hard to maintain the equipment and buy some spare part of it.Firstly, the development of the logging instrument and the problem faced now are introduced. Secondly, based on the deficiency of the logging instrument and the domestic application the winch general parameters testing instrument is designed in this paper. Its main function is measuring the velocity, depth and the tension to the cable of the logging instrument in the well.In order to make the software design convenient and modularize the program for the repetitive use, chips used for the hardware design were chosen from the same company. Several kinds of singlechips produced by Microchip were used as the central control. The system also used DA,AD,LED display drivers and DC-DC produced by Maxim to achieve the function of collecting and outputting the signals and LED display. The sensing device used in measuring the velocity and the depth is the incremental encoder which was fixed on the derrick. The incremental encoder rotates with the pulley to achieve the function of measuring the velocity and the depth. Hang the tension pick-up beneath the pulley. The tension of the instrument passes to the tension pick-up through the cable and the pulley. So we can measure the tension in this way. The system also used real time(SD2300A)to display the real time and 101 LED to display the analog signal.