SU1416704A1 - Device for measuring and monitoring final displacement of mining machine jack piston - Google Patents

Abstract

The invention relates to mining technology and allows to increase the measurement sensitivity when changing the final movements. For this, the device is equipped with two rectifying bridges and an additional AC winding of DOPT 11, and the inductive sensor is made of two B-shaped cores (C) 8. Each of the C 8 is equipped with a bias winding (GO) 9 and DOPT 12. There is a GPR 9 on the middle rod 10 С 8, and DOPT 11 and 12 are located in eccentric bores made in C 8. The proprietary DOPT 12 of one C 8 is connected in parallel to one of the diagonals of each rectifying bridge, and parallel to their other diagonal is connected the winding of the PKO 9 with the other C 8. When the piston is moved and stopped against one or the second C 8, the flow corresponding to OPM 9 increases. bias C 8. On one of the DOPT 11 or 12 the inductance decreases, and on the other - increases. Accordingly, the voltage increases on one of the DCPT 11 or 12, and decreases on the other, which causes additional bias C 8. Decreasing the voltage on the DOPT 12 of one C 8 reduces the current of the PM 9 of the other C 8. At the output of the circuit (on the resistor 14) a signal appears, the polarity of which is determined by the position of the piston, and the magnitude of the signal by the coordinate of the piston from the end position. 3 il. I (L

Description

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The invention relates to mining technology and is intended for contactless measurement of the final movements of a jack of a mining machine or complex.

The aim of the invention is to increase the sensitivity of the measurement when changing the final movements.

FIG. 1 shows the proposed device, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a circuit for turning on the device.

The device (Fig. 1) contains a cylinder 1, a rod 2, a piston 3 with ferromagnetic tips 4 of a conical shape, an inductive sensor consisting of devices 5 and 6 and mounted in the cylinder through non-magnetic sleeves 7 from the side of the piston and piston cavities. Devices 5 and 6 are made the same. Each device consists of an W-shaped core 8, a submagnet winding 9 located on the middle rod 10, alternating current windings 11 and 12, which are placed in a concentric bore of the rod 10 in such a way that the 4to magnetic conductor around them is closed. The windings are interconnected in series and connected to alternating voltage. The winding 12 of the device 5 is via a rectifying bridge 13 connected in series with the winding 9 of the magnetised device 6, and the winding 12 of the device 6 via a rectifying bridge 13 is connected in series with the winding 9 of the magnetization of the device 5. The output voltage of the terminals is removed from the resistor 14, connected to the same poles of rectifying bridges 13.

The device works as follows.

An alternating voltage is applied to the windings 11. If the jack piston is between devices 5 and 6, then the voltage on the windings 11 of the sensor, equal to each other, is equal to half the network voltage. The voltages on the windings 12 are also equal. Since the magnetic cores of the devices for the biasing windings 9 are open, the biasing of the middle rods with the windings 11 and 12 is equally due to the scattering fluxes. The inductive resistance of the windings 12 is relatively large, the current and power consumed by the devices are small. The output voltage taken from resistor 14 is zero. When the piston is moved and stopped, for example, against device 6, the constant magnetic flux from the winding 9 of this device

melts, which leads to an increase in the magnetized winding of the magnetic biasing from another depletion of the core 8 with the windings 11 of the core.

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12 alternating current. The inductance of the winding 11 of the device 6 decreases, so the voltage also decreases, and the voltage across the winding 11 of the device 5 increases. As a consequence, the voltage on the winding 12 of the device 6 decreases, and on the winding 12 of the device 5 increases, causing an increase in the current of the winding 9 of the device 6 and thereby providing additional biasing of the core with windings II and 12.

 A decrease in the voltage on the winding 12 of the device 6 reduces the current of the winding 9 of the device 5. As a result, the output of the circuit (on the resistor 14) is a signal whose polarity is determined by the position of the piston, and the magnitude of the signal is the coordinate of the piston from the end position. When the piston is located at the device 5, the voltage on the windings 11 and 12 of this device decreases, and the voltage on the windings 11 and 12 of device 6 increases, which leads to an increase in the biasing of the device 5 and the appearance of a voltage on the output of the resistor 14 with polarity corresponding to the position of the piston above the device 5, the magnitude of the signal is determined by the coordinate of the piston from the end position.

Claims (1)

Invention Formula five A device for monitoring and measuring the final movements of the ground jack of the mountains The machine’s NOR contains an inductive end-motion sensor interacting with a ferromagnetic tip with an AC winding connected to an AC source, characterized in that, in order to increase the measurement sensitivity, the device is equipped with two rectifying bridges and an additional AC winding, and an inductive sensor made of two W-shaped cores, each of which is provided with a bias winding placed on the middle core of the core, and an additional winding AC, while the W-shaped cores are made with concentric borings, in which the AC windings are located, with parallel to one of the diagonals of each rectifying bridge an own additional AC winding is connected, parallel to the other diagonal of each rectifying bridge, the bias winding is connected to the other core. BUT FIG. g