SU1534328A1 - Apparatus for automatic check of storage of loose materials in hopper - Google Patents

Abstract

The invention relates to weighing equipment, namely, devices for automatic control of bulk materials in a bunker, and can be used in the mining industry. To improve the accuracy of monitoring stocks of bulk materials, a correction circuit was inserted in the device, which ensures that the starting and ending times of the bunker volume controlled by two upper levels of the material are recorded, which is calculated from the angle of repose while determining the weight of the material in the controlled volume. . For this, the monitoring device additionally contains a material moisture sensor 14, a material size setting master 16, as well as a summation unit 17, a material inclination angle calculator 18, a proportionality coefficient calculation unit 19, and a correction setting unit 20 associated with the rest of the circuit elements. 1 il.

Description

The invention relates to the field of weighing technology, namely, devices for automatic control of stocks of bulk materials in the bunker, and can be used in the mining industry.

The purpose of the invention is to improve the accuracy of control of stocks of bulk materials in the bunker.

The drawing shows a block diagram of the device for automatic control of stocks of bulk materials in the bunker.

The device contains two sensors 1 and 2 of the upper level of the material in the bunker, over bin 3 and sub-bin A weighing instruments, five AND 5–9 elements, an inverter 10, a delay element 11, a control counter 12 of the weight of the loaded material and a control counter 13 of the unloaded material. In addition, the device contains a material humidity sensor k, an analog-to-digital converter 15, a material size distribution unit 16, a summation unit 17, a sledge angle calculating unit 18, a proportionality coefficient calculating unit 19, a correction setpoint calculator 20, a reversible counter 21, the decoder 22 and the display device 23.

To account for the volume of the material cone in the bunker, it is necessary to determine the angle of repose of the coal in the bunker.

To determine the angle of repose, the following analytical dependencies are obtained:

y-p0-Ak (1-exp) (- Kx3); Ats-20.85- (2.75-0.25-xg) x, -1.05x2 + N.

, 006 + (0.157 + 0.193hg) x ,; , 67 + (1.75 + 0.75 xg) x, + 2.67 x 2; x, - (d-83) / 8; xa- (w-5) / 5,

five

0

five

0

50

five

where ft is the angle of repose, hail;

x - loading height, m;

w - humidity,%;

d is the content of the class of 0-3 mm in the loaded material,%,

Since the upper level sensors are installed stationary, we will assume the value of x const.

An analysis of these dependences shows that with an increase in the moisture content of the feed material, the angle of repose increases, while increasing the size of the material (reducing the fraction content of 0-3 mm) leads to a decrease in the angle of repose. Thus, in order to work out the correction setpoint when the material cone in the bunker reaches the response levels of the first and second Upper level sensors, it is necessary to calculate the weight of the material in the bunker taking into account the angle of repose.

The weight of the material in the hopper is determined by the expression

R, -Rd,

where P4 is the weight of the cylindrical part of the material in the bunker; P.J - the weight of the conical part of the material; RD - weight dosed from the hopper

material.

This expression can be represented as:

R ,

where, (p; -p;); Р, Р - indications

control counters of the loaded and dosed materials; K - coefficient proportional to the angle of slope of the conical part of the material in the bunker,

J

TO

BUT

Kw where K is the proportionality coefficient;

coefficient proportional to the content of class 0-3 mm in the material;

material moisture ratio.

The device works as follows.

When loading material into the hopper, the pulses from the above-bin load cell 3 increase the number recorded in the reversible counter 21 by

using an analog-to-digital converter.

The signal from the output of block 18 for calculating the angle of repose is fed to the input of block 19 for calculating the proportionality coefficient K. The calculation is performed taking into account the geometrical parameters of the bunker. In block 20 for calculating the correction set point, a digital setpoint is determined for the correction, which is fed to the installation inputs of the reversible counter 21.

For the purpose of visual observation

well, corresponding to the weight of the loaded 15 results on the pre-material display unit 23. In the process of dosing material from the hopper, the pulses from the sub-bin weighing device k are fed to the input of the subtraction of the reversible counter 21 and reduce the number recorded in it by the amount of material consumed. With simultaneous dosing and loading, the calculation process proceeds in parallel. If, during the loading process, the material level reaches the first sensor of the upper level, the pulses from the over-bin weighing device 3 through the first element I will be fed to the input of the counter 12 of the weight of the loaded material, and the pulses from the sub-bin weighing meter k through the second element I to the input of the counter 13 of the metered material .

After the operation of the second upper level sensor, the first 5 and second 6 elements I are locked through the inverter 10, i.e. The pulses from the weighing meters to the counters 12 and 13 stop. At the same time, the third element And 7 connects the outputs of both counters to the summing unit 17, unlocking the fourth 8 and fifth fifth elements I. In the summation unit, the weight of the material in the conical part is calculated by calculating the output difference weight measurement signals. From the output of the summing unit 17, the signal enters the block 18 for calculating the angle of repose.

Since fluctuations in the size of the charged coal are relatively rare and small, the value of the product KxKj is set manually with the aid of a grain composition setter with a pulse output. The magnitude of the coefficient K, is determined by the magnitude of the signal from the humidity sensor, and the signal is converted from analogue form to digital 5 o

The output signal of the reversible counter 21, received in binary-decimal code, is converted into a signal in decimal code using a decoder 22.

After performing the operations, the output signal of the third element And 7 through the delay element 11 sets the control counters 12 and 13 of the weights of the loaded and metered materials to the zero state.

Control weight counters and a reversible counter, And elements and a delay element can be made on the basis of the use of K155 series microcircuits. The decoder can be implemented on the chip K155ID1. The display unit is structurally made on IN-6 neon lamps.

Computing units can be implemented using microprocessor technology. An analog-digital converter can be obtained on a K57APV1A microcircuit. As a humidity sensor, you can use the Neutron-3 moisture meter commercially available by the domestic industry. The particle size adjuster can be implemented on 5 K155 series triggers using push-button preset.

Claims (1)

Invention Formula five 0 A device for automatic monitoring of bulk materials in a bunker, containing over bunkering and sub bunker weighing instruments with pulse outputs, five logic elements AND, a reversible counter, the input to the subtraction of which is connected to the output of a sub bunker weighing meter, a control counter of the weight of the loaded material, an inverter, the first upper level datum material and display unit, characterized in that, in order to improve the accuracy of control, a control counter of the discharged material is inserted into it, the second sensor is top its material level, set at the same level with the first, the delay element, the decoder, the material moisture sensor, the analog-to-digital converter, the particle size adjuster, as well as the blocks of summation, calculating the angle of repose of the material, calculating the proportionality factor and calculating the correction setting, the first the inputs of the first three elements And are connected to the first material level sensor, the second inputs of the first and second elements And are connected via an inverter with the second material level sensor Ala, the second input of the third element I is connected to the second sensor of the upper level, the third input of the first element I is connected to the output of an over-bin weight gauge and the input to the addition of a reversible counter, the third input of the second element I is connected to the output of the bunker weight gauge Dinen with the first input of the control estimator of the weight of the loaded material, the output of the second element AND is connected to the first input of the control counter of the weight of the material being unloaded; the second inputs of both control weight counters are connected through the delay element to the output of the third element AND, the outputs of the control counters of the weight of the loaded and unloaded materials are respectively connected to the first inputs of the fourth and fifth elements And , the second inputs of which are connected with the output of the third element I, and the outputs of the fourth and fifth elements AND are associated respectively with the first and second inputs of the summation block, yes The moisture sensor is connected via an analog-digital converter to the first input of the unit for calculating the angle of repose of the material, the second input of which is connected to the unit of the particle size distribution of the material, and the output to the input of the proportionality ratio calculator, the output of which is connected to the first input of the correction setting calculation unit, the second input of which is connected to the output of the summation block, and the output of the block for calculating the correction setpoint is connected with the installation input of the reversible counter, the output of which is through The actuator is connected to the display unit.