SU145464A1 - The method of controlling the completeness of shifting sections of mechanized mine lining - Google Patents

Description

Control of the completeness of the movement of each section of the support by the full step size is a prerequisite for normal operation of mechanized supports in coal mines.

The known methods of such control are based on the use of a multi-wire signaling scheme, which requires a large number of copper wires, cluttering up, their passages in the lining and creating, their inconvenience during operation.

The proposed method of controlling the completeness of shifting sections of mechanized mine lining does not have these disadvantages. The method differs from the known ones in that instead of a multi-wire signaling circuit, a circuit is applied using inductive sensors and non-contact telemechanical devices, where the signals on the support sections position are transmitted to the operator by means of ferrite-diode cells.

FIG. 1 shows an electrical diagram of the installation of an inductive sensor on one of the lining sections; in fig. 2 is a block diagram of the proposed control method.

The diagrams indicate: / - wires for signaling transmission; 2 - wires for internal communication; 5 - wires for sending forward pulses; 4 - wires for power; POISON - inductive sensors; MEs are kits consisting of two magnetic elements and two communication diodes; PT - semiconductor triodes, which are contactless sensor keys; W „- load winding of the magnetic element; DG - differential transformer; F — Motion Impulse Driver; LS - linear signal transmission unit; LSI - linear unit of transmission of the clock pulse; C - match schemes; Р - contactless distributor of operator’s station, made on the same magnetic elements as

Al 145464-2ME; BR - contactless relays controlling indicators (lamps, etc.); 3-block, including a sound signal of a non-revenue section (common to the entire installation); BP - power supply unit.

The base of each lining section is supplied with an inductive sensor. On the sliding part of the lining is the sensor bore, which can serve as one of the structural elements of the section. In the extended position, the measles closes the magnetic flux of the sensor, not income to the poles of the magnetic circuit by 1-2 cm, and the current changes, which is used to reverse the voltage phase on the output winding of the differential transformer DT. The magnetic fluxes of the input windings Wi and W2 act towards each other. With a sensor position corresponding to a large current, the winding flux Wi prevails over the winding flux Wz and the output voltage has a phase corresponding to the phase of the f / s flow. With a low sensor current, current 02 prevails and the voltage Id changes its phase to reverse. The phase reversal of the f / s voltage leads to the opening of a contactless key, which in the open position passes signals from the pulse generator to the communication line. In the non-inverted phase of the voltage Ug, the triode is closed and the signals do not pass. Opening the key passes when the section is fully extended and the measles reach the sensor magnetic circuit. The accuracy of control of the implementation of the stroke can be adjusted and be depending on the need and working conditions, lining 1 cm and more

To transmit signals to the operator, control the extreme positions of the sections of the support using non-contact, time-divided tele-signaling, built on the use of ferrite-diode cells. The source of the impulse above. Into the communication line the contactless key of the sensor is the load winding W of the magnetic element. The source of the propulsive pulses is the alternating current network, from which the windings of the transmitting elements and the components of the distributor of the receiving device are fed through the pulse shaper F of the pulses.

The ME, PT and DT nodes are mounted in the same shell of the section block. The block section has an explosion-proof design.

The sensor body is made of a non-magnetic material and its cavity is filled with insulating mastic. The sensor is suitable for use in earths that are hazardous to gas and dust.

All nodes (except for the sound signal) indicated on the operator’s point and circled by a dotted line are placed in one control device, also having an explosion-proof design.

A power unit and a pulse shaper are placed in the separate section in a separate shell.

9 wires are laid between the sections: two for signaling transmission, three for internal communication, two for sending forwarding pulses and two for power. Supply voltage 36 V, 50 Hz. Maximum current of one sensor is 0.2 a. Since normally half of all sections of the unit are pushed in and half extended, the average sensor current will be 0.15 a.

The maximum allowable distance from the support to the operator with a TVS type cable can be up to 6 km.

On the monitoring device, the indication of the position of the sections can be made in various ways: with a single warning light (tracked, lit), with two differently colored lamps, a dial instrument, a recording on a multi-pen recorder. Alarms can

produced with permanently extinguished lamps, illuminated only when an abnormality appears, or with permanently burning lamps. If the section is not profitable, a sound signal (common) can be turned on and the corresponding signal lamp flashes. In conclusion, the Institute of Mining. AA Skochinsky notes that the proposed method fully complies with the requirements for monitoring the position of mechanized roof supports and is suitable for virtually any number of sections. The advantages of the method are: the absence of mechanically activated contacts, explosion safety, good protection from the influence of external environment and ease of operation. In conclusion, it is also noted that the proposed solution for controlling the movement of sections of mechanized roof supports is new, fundamentally workable, and has industrial utility. The Institute of Mining considers it necessary to develop equipment, make prototypes and carry out bench and industrial tests on one of the mechanized supports.

Subject invention

A method for controlling completeness of mechanized shaft support sections, characterized in that inductive sensors and a non-contact telemechanical system are used to control their complete shifting, and signals on the position of the support sections are transmitted to the operator using ferrite-diode cells.

Operator point

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