SU575288A1 - Device for monitoring the speed of conveyer belt movement - Google Patents

Description

Invention

refers to vehicles.

The known device speed control, made, for example, in the form of a tachogenerating sensor and secondary equipment (1.

Disadvantages include bulkiness, complexity, and lack of reliability.

A device for controlling speed of a conveyor belt is known, comprising a speed sensor, kinematically associated with a tension drum axis, and an electronic unit (2J.

In order to increase the reliability of the device, the speed sensor has a movable core made in the form of a multipath star behind: mounted on an axis, kinetically connected to the axis of the tension 6apa6aHaV and a magnetic base made in the form of a disk, in the center of which there is a cylindrical core with the input winding, and at the periphery of the disk - a cylindrical core with an output winding connected to the electronic unit.

The drawing shows the proposed device.

The device comprises a drum 1, controlled by an electric motor 2, and a tension drum 3, rotating due to the movement of the conveyor belt 4 around an axis 5, kinematically connected with a speed sensor.

The speed sensor contains a movable core 6, made in the form of a multi-star, fixed on an axis, kinematically connected with the axis of the tension drum 3 and the magnetic base 7, made in the form of a disk. In the center of the latter, along axis 5, there is a cylindrical core 8 with an input winding 9 podmyuchennoy to a source of direct current, and the core 10, mounted on the periphery of the magnetic base with the output winding II connected to. electronic unit. The electronic unit contains RC - circuit 12 connected to the control electrodes of the thyristor 13, and the winding of the executive relay 14 connected to the anode circuit of the thyristor 13 in parallel with the capacitor 15.

The device works as follows.

When the electric motor 2 is turned on, the driving drum I rotates and drives the conveyor belt 4. The movement of the conveyor belt rotates the tension drum 3 with the axis 5, at the end of which a movable core 6 is fixed to the end side of the core 8 of the rotating core closes the magnetic circuit of the core 8 s the input winding and the core 10 with the output winding 11 through

magnetic base 7.

The hook as winding 9 is powered by a constant current source, the periodic closing of the magnetic circuit and the drive emf proportional to the rate of change of magnetic flux and the number of turns W of winding II, which is defined by

d0

W

E d t

Claims (2)

In view of the fact that the magnitude of the signal E with a constant number of turns W and a magnetic flux F depends on the speed of rotation of core 6, then using RC - circuit 12 it is easy to adjust the thyristor to a speed of rotation of the drum at which it remains on (state normal mode), and when the speed decreases, it switches off and gives a command to external control and signal circuits. Apparatus of the Invention A device for monitoring the speed of a conveyor belt containing a sensor speed, kinematically associated with the axis of the tension drum, and the electronic unit, are different from the fact that, in order to increase the reliability of the device, the speed sensor has a moving core, made in the form of a multipath star, fixed on the axis, kinematically connected with the axis of the tension drum, and a magnetic base, made in the form of a disk, in the center of which there is a cylindrical core with an input winding on the axis, and a cylindrical core with an output winding connected to the electronic unit on the periphery of the disk. Sources of information taken into account in the examination: I. Buchholz V.P. Sensors and relays of automatic control in the mining industry. M., 1971, “Subsoil, p. 54-55. 20 2. Kosharsky B.D. et al. Automation of enrichment plants. M., "Nedra, - 1966, p. 217 -219.