SU1588658A1 - Apparatus for checking longitudinal rupture of conveyer belt - Google Patents

Abstract

This invention relates to automation of conveyor transport and is intended to control the integrity of conveyor belts. The goal is to increase the sensitivity and reduce energy intensity. The device contains a sensor-conductor 3, laid in the form of parallel series-connected loops inside the conveyor belt 4. The height of the loops is equal to the width of the belt 4. The conductor is connected to the receiver 2 and the transmitter 1 of the signal, made in the form of decayed antennas placed between the cargo and the idle branches mi conveyor. When the tape 4 moves and the generator 5 is turned on in transmitter 1, a harmonically varying current flows, creating an electromagnetic field through conductor 3. In the absence of a tape gust, an alternating current flows along the contour creating a field with a frame antenna receiver 2. The signal from its output through the signaling unit formed the amplifier 6, the rectifier 7 and the comparator 8, is registered by the actuator 9. When the tape is broken, the comparator 8 of the signaling unit has a zero signal output, according to which the actuator zm 9 will disable the conveyor drive. 1 il.

Description

The invention relates to devices for controlling conveyor belts with longitudinal breaks and can be used on belt conveyors.

The aim of the invention is to increase the sensitivity of the device and reduce energy consumption.

The drawing shows a structural diagram of a device.

A device for controlling a longitudinal rush of conveyor belts comprises a transmitter 1 and a receiver 2 made in the form of frame antennas. The transmitter 1 and receiver 2 are located at such a distance that their mutual inductance is almost equal to the bullet. The device also contains a conductor 3, laid in the form of parallel series-connected loops inside the tape 4.

The height of the loops of the conductor 3 is equal to the width of the working part of the tape 4, and the step between the loops is selected based on the maximum allowable longitudinal rush of the tape 4.

The loop antennas of the transmitter 1 and receiver 2 are located in the plane of the closed loop formed by the conductor 3, between the cargo and idle branches of the conveyor.

The harmonic oscillation generator 5 is connected to the transmitter 1. The frequency of the generator 5 depends on the length of the conveyor belt, and is also determined by the radiation resistance of the antenna - transmitter 1, which should be insignificant in order to practically eliminate the connection between the transmitter 1 and receiver 2 bypassing a closed loop formed by the conductor 3 (due to the emission of electromagnetic waves by the transmitter 1).

The output of the receiver 2 through the amplifier 6, the rectifier 7 and the comparator 8, forming a signaling unit, is connected to the actuator 9. To increase the sensitivity of the device, a capacitor 10 is connected in parallel with the receiver antenna of the receiver 2, the capacitance of which is selected so that the frequency of natural oscillations of the circuit formed by the inductance antenna receiver 2 and the capacitor 10, coincides with the frequency of the generator 5. This significantly increases the amplitude of the useful signal.

The device operates as follows.

When the generator 5 is connected to the antenna of the transmitter 1, a harmonically 50 variable conductivity current flows in it, creating an alternating electromagnetic field in space. The flux of the magnetic induction vector, the specified magnetic field through

Editor N. Horvat Order 2511

VNIIIPI State

113035, Production and publishing closed conductive circuit, laid in the belt 5 of the conveyor, also varies in harmonic law. According to the law of electromagnetic induction, an alternating current flows in the circuit in the absence of a tear of the tape 4. This current creates its own alternating magnetic field, the lines of force of the induction vector of which, penetrating the frame of the receiver antenna 2, induce an induction emf in it, which also changes in harmony with the law with a frequency equal to the frequency of the generator 5 transmitting the antenna-transmitter 1.

The signal taken from the output of the loop antenna receiver 2 enters the signaling unit, is amplified by its amplifier15 lem 6, rectified by its rectifier 7 and fed to the input of its comparator 8. At the output of the comparator 8 of the signaling unit, we obtain a high-level constant voltage corresponding to a logical unit. With a longitudinal rupture of the con ^{20 of the} fan belt 4, the conductivity of the circuit laid in the tape 4 is broken, so the amplitude of the EMF in the receiver 2 drops to almost zero, the signal level at the input of the comparator 8 of the signaling unit _{25 is} insignificant, and therefore, the voltage at its output drops to the level corresponding to logical zero.

When a logical zero appears at the output of the comparator 8 of the signaling unit, the actuator 9 _I 30 trips the conveyor drive (not shown).

Thus, the device constantly monitors the longitudinal integrity of the belt, which significantly increases the operational reliability of the conveyor belt 35 equipment, reduces the cost of acquiring conveyor belts during operation and increases the useful life of the equipment.

Claims (1)

Claim A device for monitoring a longitudinal rupture of a conveyor belt, comprising a sensor conductor forming a closed loop inside the belt, connected to a receiver and a signal transmitter, a signaling unit connected to the output of the signal receiver, and an actuator, characterized in that, in order to increase the sensitivity and reduce energy consumption, the conductor is laid in the form of parallel series-connected loops equal in height to the width of the tape, the transmitter and signal receiver are made in the form of loop antennas located between do cargo and idle branches of the conveyor. Proofreader V. Girnyak SCST USSR Gagarina, 101