SU897913A1 - Scanning device for paper-making machines - Google Patents

Description

(54) SCANNING DEVICE FOR PAPER MACHINES

I

The device relates to a technique for continuously controlling parameters across a width of a web-like material and can be used in the pulp and paper, chemical, textile, metallurgical and other industries.

It is known to scan, its device for paper machines, containing a rigid frame with a carriage with windings on it, on which the primary transducers of monitored parameters, two tires rigidly mounted along the direction of the frame, an information-measuring system and a power supply source wives 1.

The disadvantage of such devices is a relatively low efficiency.

The purpose of the invention is to increase the efficiency of the device.

This goal is achieved by the fact that in the scanning device for papermaking machines, containing a rigid frame with a carriage with windings on it, on which are primary transducers of controlled parameters with a power supply unit, two tires, rigidly installed along the guide frames, information-measuring the system and the source of supply voltage, the tires are made of magnetic conductive material, form a closed magnetic circuit and have at least two windings located on them, one of which is The x is connected to the power supply source, the other to the input of the information-measuring system, and the carriage additionally has at least two windings, one of which is connected to the power supply unit of the primary converters, and the second is connected to the outputs of all the primary converters.

FIG. 1 shows a device with an overall block diagram; in fig. 2 - the electrical circuit of the device is functional.

Claims (1)

The device consists of a rigid frame 1 with a carriage 2 located on it, on which the primary transducers 3 of the controlled parameters of the moving canvas-like material are mounted. The carriage 2 can perform a reciprocating motion along frame 1 along the guides 4 of the frame 1. Tires 5 made of magnetic conductive material are rigidly mounted along the guides 4 of the frame 1 and form a closed magnetic circuit equipped with two windings 6 and 6, one of which 6 is connected to the power supply source 7, and the other 6 is connected to the input of the information-measuring system 8. There are two windings 9 and 9 on the carriage. One of the windings 9 is connected as a power source to the power supply unit 10 of the primary converters 3 .. ..3 and you moves of primary converters 3 .... 3, converting analogous signals of primary converters 3V ... 3 to a form convenient for their transformation by any known method, are connected to the second winding 9 via a block of converters 11. Both windings 9 and 9 are placed on the carriage 2 in such a way that the magnetic core 5 acts as a core. The device works as follows. When a supply voltage 7 is connected to the winding 6, a current flows through the winding, creating an alternating magnetic flux in a closed magnetic circuit, causing an electromotive force in the winding 6 and windings, the value of which is proportional to the number of turns in these windings. A specific selection of turns in the winding 9 induces an emf sufficient to power all the primary converters 3, and in the windings 9 and 6 they induce an emf of industrial frequency of relatively small magnitude. To completely isolate the information-measuring system 8 and the converter unit 11 from these EMFs, it is possible to put a filter plug tuned to the industrial frequency between them and the corresponding windings 6 and 9. During the reciprocating movement of the carriage 2 along the guides of the frame 1, the moving sheet-like material is scanned over its area and information signals, whose magnitudes are proportional to the current values of the controlled parameters of the sheet-like materials, are fed from the primary transducer outputs through the primary transducer 3 either in frequency-modulated signals, or in a sequence of pulses on a winding 9. At the same time, by winding 9 ekaet current causing the appearance of a closed magnet circuit corresponding magnetic fluxes, resulting in the appearance of boiling in the coil 6 emf value or a code state of the output signals which are proportional to the primary transducers. These EMFs are fed to the input of an information-measuring system, which processes them in accordance with specified algorithms and provides information about the values of monitored parameters. Simultaneously, similar EMFs are induced in the windings 6 and 9. Formula of the invention A scanning device for paper machines containing a rigid frame with a carriage with windings on it, on which the primary transducers of controlled parameters with a power supply unit are mounted, two tires rigidly mounted along the guide frames, an information-measuring system and a source of supply voltage, characterized in that, in order to increase the efficiency, the wounds are made of a magnetic conductive mat They form a closed magnetic circuit and have at least two windings located on them, one of which is connected to the supply voltage source, the other is connected to the input of the information-measuring system, and the carriage additionally has at least two windings, one of which is connected to the power supply unit of the primary converters, and the second is connected to the outputs of all the primary converters. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2614581, cl. D 21 F 7/00, 1978.  gh j f