SU1571411A2 - Device for measuring static load in conveyer - Google Patents

Abstract

This invention relates to a weight measuring technique. In order to expand the scope of application due to the possibility of measuring simultaneously on several sections of the conveyor, additional combinational and accumulating adders in the amount equal to the number of controlled sections of the conveyor are entered into the device, the shift register is made in the form of serially connected sections, the number of which corresponds to the number of controlled sections of the conveyor, and the capacity of each of which is proportional to the length of the corresponding section of the conveyor, with the summing inputs additional to mbinatsionnyh adders connected in parallel with the respective inputs of the shift register sections, subtracting their inputs connected to the outputs of the same sections, and outputs connected to inputs of the respective other accumulator, whose clock inputs and clock inputs of combinational additional adders are connected to outputs sync block. 1 il.

Description

This invention relates to a weight measuring technique.

A device for measuring a static load on a conveyor is known, comprising a two-channel display device, a conveyor drive speed sensor and a running load sensor, the outputs of each of which are connected to the corresponding inputs of a multiplier unit whose output is connected to the integrator input by a contactless key, first shift and the second accumulating adders, the output of each of which is connected respectively to the input of the first and second-channel input device channel, a combinational adder, g VA analog-digital converter, the sampling-hryvnia device whose input is connected to the integrator's output, and the output of the sampling-storage device through the first analog-to-digital converter connected to the input of the first accumulating adder, input + combi-dryer and information input of the shift register, the output of which is connected with input - combinational word:; ator, generator, irregular: frequency divider, whose input is associated with the output

js-lt

Stssi

1H

the generator and the output with the synchronizing inputs of the first and second analog-to-digital converter, the synchronization unit and the adjustable frequency divider, whose information input is connected to the generator, the output with the input of the synchronization unit, and the control input of the adjustable divider the output of the second analog-digital converter, the input of which is connected to the output of the speed sensor, each of the outputs of the synchronization unit being connected, respectively, to the control inputs of the shift register, contactless cells Cha, the first and second accumulators, and Raman Matora sampling-storage device and the output of the adder combination with one with the input of the accumulator,

The known device allows with sufficient accuracy to determine the sum of the static load on the conveyor belt, but does not allow to simultaneously determine the static load on separate sections of the belt between the drives of the multi-drive conveyor or on single-drive -sworm ™ conveyors with a complex material transport route profile.

The purpose of the invention is to expand the field of application of the device by means of providing the possibility of measuring simultaneously on several subjects:

The drawing shows a functional diagram of the proposed device (an embodiment, when the number of tape sections is N 3),

The device contains the speed of the first in the course of the movement of the material of the electric motor 2, the electric motors 3 and 4 and the sensor 5 running load. The outputs of the sensors 1 and fi are connected to the inputs of the multiplication unit 6 The output of the multiplication unit 6 is connected to the input of the integrator 7, which is plugged with a contactless key 8, The output of the integrator 7 is connected to the i input of the device 9 sampling-storage, the output of which is connected to the first analog-digital converter (ADC) 10, the outputs of the ADC 10 are connected to the inputs of the first accumulating adder 11, summing the input Raman adder 12 and the data inputs of the shift

five

0

five

0

0

five

register 13, the shift register 13 consists of sections 14-16 connected in series, the capacity of each of which is proportional to the length C, LJI and L3 of the corresponding section of the tape. The outputs of the shift register 13 are connected to the subtracting inputs of the combinational adder 12, the outputs of which are connected to the inputs of the second accumulating adder 17.

The outputs of the accumulating adder 11 are connected to the first channel of the display device 18, and the outputs of the accumulating adder 17 are connected to the second channel of the display device 18.

The output of the reference generator 19 is connected to the input of the unregulated frequency divider 20 and is connected to the synchronization unit 22 through the adjustable frequency divider 21, and the output of the speed sensor 1 via the second ADC 23 is connected to the control inputs of the adjustable frequency divider 21.

The inputs of sections 14-16 of the shift register 13 are connected to the summing inputs of the corresponding additional combinational adders 24-26, to the subtractive inputs of which are connected the outputs of the corresponding sections 14-16 of the shift register 13, the outputs of the additional combinational sum-tori 24-26 are connected respectively to the inputs of the additional accumulating adders 27-29,

The outputs C of the synchronization unit 22 are connected to the control inputs of the sections 14-16 of the shift register 13, the control inputs of the contactless key 8, the sampling-storage device 9, the combinational 12, 24, 25 and 26 and accumulating 11, 17, 27, 28 and 29 adders and display device 18 "The outputs a and b of the unregulated frequency divider 20 are connected respectively to the clock inputs of the A / D converters 10 and 23.

The device works as follows

The transported material is fed to the conveyor belt t and is continuously weighed by the sensor 5 linear load, the output of which produces a signal proportional to the linear load q (l) - n is fed to the first input of unit 6 multiplying 0 Speed sensor 1 of the electric motor 2 generates a signal proportional to speed

51

the conveyor belt V (t) movement, which is fed to the second input of multiplication unit 6, the output of which produces a signal proportional to the instantaneous Performance Q (t) at the loading point of the conveyor:

U6 - K, q (i) V (t) K, Q (t),

where K, is the coefficient of pro-proportional

nosti

The signal from the output of multiplication unit 6 is fed to the input of integrator 7, which integrates it over time. The integration time T, T, of the integrator 7 varies depending on the speed of movement of the conveyor belt and is proportional to the transit time of a unit of length of the tape at the loading point of the conveyor:

t A1

1 and V (t)

where U1 is the length of the tape segment on which the quantity of the incoming load is determined,

The change in the integration time is provided by shunting the integrator 7 with a contactless key 8, the control input of which receives pulses from the synchronization unit 22, the frequency of which is proportional to the speed of the conveyor belt.

Thus, at the output of the integrator 7, a voltage is formed, the value of which at the time of the integrator 7 shunting with the contactless key 8 is proportional to the amount of cargo received per unit length of the conveyor belt:

U7 K2uQ,

where K2 is the proportionality coefficient,

The signal from the output of the integrator 7 is fed to the input of the sample-storage device 9 (VHF), stored and fed to the input of the ADC 10, which is converted into a digital code N; proportional to D Q. From the output of the ADC 1 O, the digital code is fed to the inputs of the accumulating adder 11, to the information inputs of the shift register 13 and to the summing inputs of the combination adder 12,

The accumulating adder 11 performs a digital integration with memory, i.e.

n, -.

6

+ N;

where s j. - result in memory register 111

ty accumulating adder 11 after the 1st cycle; S ,, the same, but after the i-i-th

 1-4

ta;

N is the digital code at the input of the accumulating adder I1 at the time of passing the 1st cycle.

Thus, at the output of accumulating adder 11, a digital code is formed, the value of which is proportional to the total amount of material received on the conveyor:

Q & Q (+ UQ2 +

+ Aqn

 CH8i;

This signal is fed to the first channel of the display device 8,

The shift register 13 delays the digital code N1, which is proportional to the amount of load AQ received per unit length D1 of the conveyor belt, for the time of the transport delay of the conveyor. The time lag is

ъ-L

 v (t)

where L is the length of the conveyor.

To ensure that the static load can be measured simultaneously on N sections of a multi-drive conveyor belt or a single-drive conveyor with a complex transport route profile consisting of N sections, the shift register 13 is made in the form of N serially connected sections, the capacity of which is proportional to the lengths of the respective sections of the tape,

In the proposed embodiment of the device, the number of tape sections on which, at the same time, it is necessary to measure the static load, is N 3, the lengths of these sections are respectively L (L and L-j).

With a constant speed V (c) of the movement of the conveyor belt, the time q, Јr and зап3 of delay in the corresponding sections of the belt are determined by the formulas

LJ V (t)

l Lz bi V (t)

WITH,

L, V (t)

At the output of sections 14-16 of the shift register 13, digital codes are formed that are proportional to the number of gr} - for iQ, received per unit length of D1 tape and delayed by the time of this amount of load, the corresponding sections of the tape

Since the capacitance of the sections is shifted

the register is proportional to length: o-

the corresponding sections of the tape8 then the total time of the transport for the lags is equal to the sum of the transport delays in the sections of the belt;

O- - -L j. /

(j (j, + Li t

/ - L + V (t)

Therefore, at the output of section 14 of the shift register 13, a digital code Nj (t -Ј () arrives at the input of section 15 of the shift register, subtracting inputs of the additional combinational adder 24 and summing inputs of the additional combinational1 adder 25. At the output of section 15 of the shearing register 13 is formed by a digital code equal to

N; (with -Ј,) -С-,

- N; t - (C, + yr),

and arriving at the input of section 16 of the shift register 13, to the subtractive inputs of the additional Raman adder 25 and the summing platoons of the additional Raman adder 26,

At the output of section 16 of the shift register 13, a digital code is generated, equal to

N; t -Ј, -fr2) -, N- (t -t)

and arriving at the entering entrances of the combination sumat: mator 12 and 26 "

At the outputs of the additional combinator of the adders 24 ™ 26, digital codes are formed that are proportional to the difference between the amount of load arriving at the respective sites.

0

0

five

„

ki tape, and the amount of cargo that leaves these parts of the tape. At the output of the combinational adder 12, a digital code is generated, which is proportional to the difference between the amount of cargo entering the conveyor and the amount of cargo leaving the conveyor

From the output of combinational adders 12, 24, 25 and 26, digital codes proportional to the differences between the amount of cargo entering the corresponding sections of the tape and the amount of cargo leaving these sections of the tape arrive at the inputs of the accumulator adders 17, 27, 28 and 29 which simultaneously perform digital integration operations and store information received at their inputs.

Thus, at the output of accumulating adder 17, a digital code is formed proportional to the amount of load j located on the entire conveyor belt (t proportional to the total static load of the conveyor), which is stored and fed into the second channel of the display 18. At the output of the additional accumulating adders 27-29, digital codes 5 are formed proportional to the amount of load located on the first, second and third sections of the tape, respectively, that is proportional to the static

F loads

ST.1

 and F (. on these

sections of the tape.

When changing (adjusting) the speed of the conveyor belt, its transport delay time b changes. Therefore, in order to preserve the algorithm of the device operation when the speed changes, it is necessary to change the frequency of the pulses input to the synchronization unit 22.

To ensure the operation of the device, the control inputs of additional accumulating 27-29 and combinational 24-26 adders are connected to those outputs of synchonization unit 22, which are connected to the control inputs of combinational 2 and accumulating 1 and 17 adders.

-four

Cv

Claims (2)

DEVICE FOR MEASURING STATIC LOAD ON A CONVEYOR according to avt, sv, No. 148680G, characterized by the fact that, in order to expand the scope of application by providing the possibility of measuring simultaneously on several sections of the conveyor, additional Raman scattering has been introduced into it and accumulate ^ 2 The totalizers in the number equal to the number of controlled sections of the conveyor, the shift register is made in the form of serially connected sections, the number of which corresponds to the number of controlled sections of the conveyor, and the capacity of each of which is proportional to the length of the corresponding section of the conveyor, and the summing inputs of additional combinational adders are connected parallel. the inputs of the corresponding sections of the shift register, their subtractive inputs are connected to the outputs of the technical sections, and the outputs are connected to the inputs of the corresponding additional accumulating adders, whose synchronization inputs and synchronization inputs of the additional combinational adders are connected to the outputs of the synchronization unit.