SU698655A1 - Method of automatic monitoring of circulating load - Google Patents

Description

I

The invention relates to the separation of solid materials using liquids, in particular, the control of devices using radiation absorption and can be applied in ferrous and nonferrous metallurgy and the construction industry.

A device for the control of a circulatory load in a lockable grinding cycle, containing a classifier, load sensors, an integrator and a recording device in which the load sensors are made in the form of sensitive elements with a sensor, is known.

The disadvantage of such a device is the rapid wear of the measuring elements, re-machining in the pulp flow, which is more abrasive and creates significant mechanical loads. In addition, when measuring the speed of movement of the sands, the readings of the device are greatly influenced by the amount of water supplied to the sand trough.

It is also known to have an automatic circulation load monitoring device, implemented as a source and receiver of penetrating radiation, with integrators registering device 2.

The accuracy of the measurement in this is influenced by the water classifier, and the change in the speed of unloading of sand, the sticking of the material on the spirals and walls of the trough of the classifier. In addition, depending on the changes in the physicochemical properties of the material being milled, moisture-containing sands discharged from the classifier can vary from 9 to 20%, which leads to errors in determining the circulation load.

It is necessary to add that the need to distribute the source and receiver of ionizing radiation far requires large values of the source activity and leads to additional. measurement errors.

Claims (2)

The purpose of the invention is nofu-iiiieKHe precision control of circulatory pulses. This is achieved by the fact that the device is additionally supplied with a source and receiver of neutron radiation, multiplication and subtraction units, to the inputs of which two outputs of the neutron radiation receiver are connected, and integrators connected to the outputs, and the output of the penetrating radiation receiver is connected to the second input of the multiplying unit. shows the proposed device. It has a classifier 1 with spirals 2, a belt conveyor 3, a gamma-ray source 4, a neutron-source 5, a gamble ray and neutron receivers 6, a multiplier unit 8, a subtraction unit 9, integrators 10 and 11, recording instruments 1.3, and 13, sand trough 14, pipeline 15 additional water. The device works as follows. Sands from the trough of classifier 1 unload 1x; spirals 2. on conveyor 3 moving at a constant speed. The gamma-radiation of source 4, the passage through the sands on the conveyor belt, is attenuated in proportion to the weight of the sands P and captured by the receiver 6. The neutron radiation of source 5 when passing through the sands on the tape is reduced proportionally to their hydrogen content (and NV and moisture content is captured by the receiver 7. Signals from the outputs of receivers 6 and 7 are fed to the inputs of multiplication unit 8, from which output a signal is proportional to the number of w in the sands PW. This signal is sent to the integrator .1.0, to which A recording device 12, showing the flow of water carried by the sands. To the second output of block 8 a subtraction unit 9 is connected, in which the signal from the receiver Q proportional to the total weight of sand and water on the tape is subtracted from the unit 8, s proportional to the weight of 6 54 water). From the output of block 9, a signal proportional to the instantaneous weight flow of the solids of the circulation load is fed to the integrator 11 and the recording device 13, the sands from the conveyor are washed into the sand chute 14 with additional water supplied through a pipeline 15 "The proposed device allows accurate measurement of both the flow rate of the solid phase of the circulation load and the amount of moisture transferred by the sands, which makes it possible to improve the control accuracy of the grinding process and to stabilize the process conditions as a result of of increased process productivity precision grinding mi stabilize the product size distribution of grinding with the same production capacity of x. Claims An automatic circulation load control device comprising a load sensor made as a source and receiver of penetrating radiation, an integrator registering a device, characterized in that, in order to improve the control accuracy, the device is additionally equipped with a source and receiver of neutron radiation, multipliers and subtractors , to the inputs of which two outputs of the neutron radiation receiver are connected, and integrators are connected to the outputs, moreover to the second input of the multiplying unit chen receiver output penetrating radiation. Sources of information (taken into account during the examination 1. USSR author's certificate NO 399252, class B 03 B 13 / Ov, 1971. 2. USSR author's certificate number 425654, cl. 03/13/06, 1972 (prototype).