SU1485024A1 - Continuous operation apparatus for metering loose materials - Google Patents

Description

The invention relates to the field of weighing equipment, in particular to the dispensers of bulk materials of continuous action, and improves the accuracy

dosing due to the fact that the signal Ρ (ί) from the transducer 2 forces after amplification and conversion to a unified signal using a normalizing amplifier 3 is fed to the input of two serially connected differentiators 4 and 5. From the output of differentiator 5, a signal is derived that is a derivative of of order ά ² Ρ (Γ) / (1 έ ^{2 of} function P (1). Then, using the inverter 6, this signal is inverted with simultaneous multiplication by a constant coefficient τ, and as the first term is fed to the input of the adder 7. / άί and third — τ) Agents are obtained using feedbacks, covering respectively the differentiator 9 and the delay element 8, which delays the output signal ¢ (/) of the adder 7 by the time τ. As a result, a signal is obtained at the output of the adder, which is a function of the change in the instantaneous performance directly at the output of the weighing conveyor in a local section. 1 il.

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1485024

1485024

The invention relates to weighing equipment, in particular to dispensers of bulk materials of continuous action, having a cantilever-type weighing conveyor, with a fixed support on the 5th side of the discharge of material.

The purpose of the invention is to improve the accuracy of dosing of bulk materials.

The drawing is a block diagram of the device. .

The device consists of a weight conveyor 1 of a cantilever type with material unloading from the fixed support side, a power converter 2, a normalizing amplifier 3, two differentiators 4 and 5, an inverter 6, an adder 7, a delay element 8 15, a third differentiator 9, a regulator 10 and unit 11 performance, unit G2 accounting for the total mass of the material, the secondary recording device 13 of the magnetic amplifier 14 and the feeder 15 with electric drive. 20

The device works as follows.

The electrical signal from the transducer 2 is a force proportional to the force P (1) generated by the weight of the material passing through the conveyor 1, after amplification and 25 conversion into a unified signal using a normalizing amplifier 3 is fed to the input of two series-connected differentiators 4 and 5. At the output of the differentiator 5, a signal is obtained representing a second order derivative of the function P (T). Next with

using an inverter 6, this signal is inverted with simultaneous multiplication by a constant coefficient m, and, as the first, is fed to the input of the adder 7.

The second and third —τ) clause

These are obtained by using feedbacks, covering respectively the differentiator 9 and the delay element 8, which delays the output signal ¢ (/) of the adder 7 by the time t.

As a result, the output of the adder is a signal 45

¢ (0 =

representing the change function

instant performance directly at the entrance of the weighing conveyor in the local section.

From the output of the adder 7, the instantaneous performance signal ¢ (/) is fed to the inputs of the secondary recording device 13 for continuous recording of the analog signal, unit 12 taking into account the total mass of material, where this signal is integrated over time, converting the voltage into a frequency signal and summing up successive pulses into counter, the reading of which corresponds to the total mass of material passed through the weight conveyor.

The instantaneous performance signal (/) is also fed to the first input of the performance regulator 10, to the second input of which a reference signal from the setting unit 11 is supplied. Formed in the regulator 10, the signal unbalance after amplification using a magnetic amplifier 14 affects the drive of the feeder 15 in the direction of increasing or decreasing the performance of the feeder 15

Claims (1)

Claim A continuous device for dispensing bulk materials containing a cantilever-type weighing conveyor with a fixed support on the discharge side of the material, with a movable support of which is connected a force transducer connected through a normalizing amplifier to the input of the first differentiator, adder, total mass metering unit, secondary recording device, performance indicator associated with the first input of the regulator, the output of which through a magnetic amplifier is connected to an electric power drive, characterized in that, with In order to improve the accuracy of dosing, two differentiators, an inverter and a delay element are entered into it, the first differentiator is connected via the second differentiator and inverter to the first input of the adder, the output of which is connected to the secondary recording device, to the unit for recording the total mass of the material, through the delay element - with the second input of the adder, through the third differentiator - with the third input of the adder, as well as with the second input of the controller.