SU717672A1 - Device for determining the mean content of iron in ore material on conveyer - Google Patents

Description

The invention relates to a technique for contactless quality control of ore materials and can be used to control the quality of iron ore materials. At. Express determination of the iron content in the ore material stream is of practical interest: average contents, determined in equal or weight or time intervals. A device of this designation is known which uses a conveyor mass sensor and an inductive sensor made in the form of an inductor coil spanning the conveyor 1. The signal from the output of the inductive sensor in this device is divided by the signal of the conveyor mass sensor, resulting in a signal proportional to the magnetic field. ore material. The disadvantage of this device is its complexity, due to the presence of a conveyor mass sensor, and the fact that average contents are calculated manually. Automatic calculation of average contents over time intervals is implemented in a magnetic conveyor ferrometer, which contains an inductive magnetic permeability sensor connected through a series-connected voltage converter to the pulse frequency, the first pulse frequency divider and the pulse counter to the recording device, pulse generator connected through the second pulse frequency divider to the control input of the registering device and to the reset pulse shaper 2. In this device, the counter reading, which is the sum of the pulses during the transportation of ore material on the conveyor (ore time), is transmitted to the recording device by a signal time pulse generator. If the ore time coincides with the time interval specified by the time pulse generator, then the information recorded corresponds to the average iron content in the ore material transported by the conveyor. A disadvantage of the known device is that when there is no ore material on the conveyor, the ore time will not coincide with the selected integraose time interval, therefore, the result recorded in such a case will contain a noncontact / malleable error. The elimination of defective amers is not always possible, since the load from the conveyor can be removed briefly and remains unnoticed by the operator. Similarly, when the conveyor stops under load, the pulse count does not stop, as a result of which the result recorded during the corresponding time interval will contain an uncontrolled error. In this case, in the first case, the recorded result will be less than the true, and in the second, more.

The purpose of the present invention is to increase the representativeness of rapid testing.

To do this, motion sensors are entered into the device: the conveyor stops and the presence or absence of ore material on the conveyor, the OR circuit, the second counter or the pulses and the separating device connected between the pulse counter and the recording device, and the sensor outputs are connected via the OR circuit to the inputs of the BL | x) a nejJBO frequency divider and a second impulse counter, connected to the pulse generator, and the control input of the dividing device is connected to the output of the second frequency divider.

The drawing shows a block diagram of the proposed device.

The device contains a sensor 1 of magnetic ohmness of ore material, connected via serially connected converter 2 voltage to its frequency, first divider 3 frequencies and pulse counter 4 to dividing device 5 and recording device 6. Connected in series to the second input of dividing device 5 7 pulse generator and an additional 8 pulse counter. The generator 7 YMG of the tiejpes second frequency divider 9 is connected to the control input of the divider device 5. Frequency dividers 3 and 9 and counters 4 and 8 pulses are reset using a pulse generator W connected to the frequency divider 9. The device is equipped with a movement-stop sensor of the conveyor and a sensor 12, the presence or absence of ore material on the conveyor, connected via logic OR 13 to the inputs of blocking the splitter 3 frequencies and the counter 8 pulses ..

The proposed device works as follows.

The magnetic permeability sensor 1 is a katui1 inductance with

open core, placed under the conveyor belt on a fixed raz-. Standing on the surface of the ore material, the coil can be included in any measuring circuit, for example, in a balanced bridge fed by alternating current. Sensor 1 outputs a voltage signal proportional to the content of magnetite (iron) s ore material located on the conveyor within the range of sensor 1. The signal from the sensor

I is converted by the transducer 2 into a pulse frequency. The pulses from the output of the converter 2 are fed through a divider 3 frequencies to the counter of 4 pulses. The counter of 4 pulses actually integrates in time the signal of the sensor; the 1st gives it; in digital form. The integration interval is set by the generator of 7 pulses and the divider frequency 9, with which you can set any integration interval, for example, 1 minute, 2 hours, 8 hours

etc. Using a pulse generator 7 and a frequency divider 9, current time intervals are formed. Pulse counter 8 allows determining the time of ore material transportation by the conveyor:

tT tn-tn tx,

where tn is the integration interval or, in other words, the time interval over which the average iron content in the ore material is determined;

tn is just the time of the pipeline; x idle time of the conveyor, or, in other words, working time; You are a conveyor without ore material. Thus, in the time interval tn, the ore material is transported only during the time t y.

Time information t is accumulated in a pulse counter. At the end of the integration interval, the output of the frequency divider 9 produces a pulse arriving at the control input of the divider device 5. The latter divides the data of the counter 4 pulses into the data of the counter 8 and distributes the final result to the registering device 6. The result of the division corresponds to the average iron content in the ore material exported during the integration time tj. The device is equipped with sensors 11 and 12, connected through the OR circuit 13 to the inputs of blocking the splitter 3 frequency and the counter 8 pulses. In case of a conveyor stop or the absence of ore material on

Claims (1)

CLAIMS A device for determining the average soder- ₃₀ Zhaniya iron ore in the material on the conveyor,