SU1735579A1 - Miner position sensor - Google Patents

Abstract

The goal is to increase the sensitivity and reliability of the control of the location of a working excavation machine. Sensitivity and reliability are increased by making the source of a constant magnetic field in the form of an open magnetic conductor with a DC winding on its rod, and the magnetic circuit of the sensing element is L-shaped. The AC winding is placed in the bore of one of the td-shaped magnetic cores connected in series with a rectifier bridge. 4 il.

Description

The invention relates to mining equipment, in particular for controlling the position of a combine, a cutting machine or plow.

The aim of the invention is to increase the sensitivity and reliability of the device.

FIG. 1 shows a notching machine with a sensor on the base section, general view; in fig. 2 is a view along arrow B, the sensor device in FIG. one; in fig. 3 is a section along A-A in FIG. 2; in fig. 4 is a circuit for switching on a sensor.

The device consists of an excavation machine 1 moving along the base sections 2. Each base section is fixed to elements 3. sensitive to a constant magnetic field. Each element is made in the form of a magnetic core 4 insulated from the body of the base section 2 by a non-magnetic gasket 5 A horizontal magnet core of the magnetic core is located in a DC 7 magnetization winding, and in the bore of another safety bar 8 is an alternating current winding 9. The magnetic core around the winding The belt current 9 is closed and an alternating magnetic flux Fl /, is created in this winding. The DC winding 7 generates a constant magnetic flux F-1 in horizontal rods x 6 and 8. An alternating current winding 9 is connected through a rectifying bridge 10 in series with a direct current biasing winding 7.

To compare the voltage drop on the DC winding 7, the reference voltage source Uon. Was inserted, to which potentiometer 14 is connected. The output voltage is removed from the resistor 15, one terminal of which is connected to the end of the DC winding 7 and the other from the findings of potentiometer 14, another conclusion

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which is connected to the other end of the winding 7.

On one of the skis 11 of the excavation machine 1, a source of a constant magnetic field 12 is installed, made in the form of an open core 12 (П, Ш-shaped or other type), with a DC winding 13, which creates a constant magnetic flux F-2. In order for the flux F-2 not to pass through the horizontal rod 6, there is an air gap 16 in the latter, which also serves to eliminate EMF in the winding of the biasing 7 from the AC winding 9.

The device works as follows.

An alternating current is applied to the winding of the alternating current 9 of the sensing element. Alternating current creates an alternating magnetic flux in the rod 8. The magnetic core for alternating current & JB rod 8 is closed. Since the alternating current winding 9 is connected through the rectifier bridge 10 in series with the bias winding 7, direct current flows through the latter, creating a constant magnetic flux F-1 that passes through the rods 6 and 8. If the ferromagnetic core 12 does not is in the zone of interaction with the sensitive element 4, then through the winding 9 in the rod

8 passes alternating current idling. Since the resistance of the winding 9 is relatively high, an insignificant direct current flows through the bias winding 7, creating a slight magnetising of the rod 8 by the flux F-1, which almost does not reduce the inductance of the alternating current 9. The voltage across the winding 7 is equal to the voltage taken from the potentiometer 14, and at the output of the voltage Uvih is zero.

At the approach of the excavation machine and the establishment of the ferromagnetic core 12 against the sensing element 4, the constant magnetic flux F-2, created by the winding of the direct current 13, passes through an L-shaped magnetic circuit 4 of the sensing element. As a result of imposing a constant magnetic field F-2 on an alternating field F, the windings of alternating current

9 its inductance decreases. This leads to an increase in the current through the winding of the bias 7 of the direct current, and, consequently, to an increase in the constant magnetic flux F-1. As a result, the alternating current winding 9 is further magnetised, the current in it increases before the onset of the steady state process. When the voltage on the winding bias 7 DC maximum, on

The output of the circuit is a signal that records the position of the excavation machine. The power of an alternating current winding 9 with its magnetowire is tenths or units of watts.

Due to the horizontal rod 6 with the winding bias 7 of direct current, the envelope of the magnetic core of the sensitive element does not increase by more than 1.5-2 times. Overall dimensions significantly

below those that has a prototype.

These advantages increase the reliability of information, which leads to an increase in productivity of the excavation machine and reduces the cost of production.

minerals.

Claims (1)

Claims of excavation position sensor containing permanently sensitive elements of the magnetic field, each of which contains a potentiometer, an alternating current winding connected via a rectifying bridge in series with the bias winding of a direct current, one end of the bias winding connected to one of the output terminals of the sensor, characterized in sensitivity and reliability, it is supplied with sources of voltage support and a source of a constant magnetic field, which is made in the form of an open ferromagnetic core with a DC winding, and toprovod each sensitive element is made-shaped, wherein at one horizontal rod is winding bias DC, in the bore of the other horizontal rod - AC coil, and to a source of reference voltage connected a potentiometer, one output of which is connected to the second end of the bias winding, and the other connected to the second output terminal. (L iA FIG. 2 0W s Rig. H I ig 1 four