SU1374058A1 - Belt=conveyer weigher - Google Patents

Abstract

This invention relates to a weighing and weighing technique. The purpose of the invention is to increase the accuracy of weighing. The signal of the force-measuring converter 4, proportional to the load on the mechanism 3, enters the analog-to-digital converter 8, where it is converted into a code. The signal of the converter L of speed is fed to the input of counter 1. The higher bits of the latter determine the number of a portion of the tape of the feeder 2 located on mechanism 3, and the lower bits define the moment of passage of the mechanism 3 by the boundary of the next portion of the tape of the feeder 2. an array of average values of tare mass, the addresses of which elements correspond to the numbers of sections of the tape. In the measurement mode, the value of the tare mass for the zero portion of the tape is read from the memory 12 at the address generated by the adder 16. This value is subtracted in the container subtraction unit 11 from the mass code supplied from the analog-digital converter 8. The obtained mass value is multiplied in block 6 by the speed signal received from the speed converter 5. 1 hp f-ly, 2 ill. to WITH and about ate 00.

Description

The invention relates to weighing and weighing technology and can be used in conveyor dispensers of continuous action.

The aim of the invention is to improve the weighing accuracy.

FIG. 1 shows a functional diagram of the scales; in fig. 2 7 the same, with the sensor of the installation of the beginning of the conveyor belt.

Scales contain loading hopper 1, installed above the feeder 2, under the belt of which the load is built

The load on the load-receiving mechanism 3, enters the ADC 8, where it is converted into a code, and the signal of the speed converter 5 is fed to the input of the counter 7, the high-order bits of which determine the section number of the feeder 2 located on the load-receiving mechanism 3, and the lower the moment of passage of the load-receiving mechanism by the boundary of the next section of the belt feeder 2.

Setting mode.

Tape length code at the counter output

the receiving mechanism 3 with the force emulator if ka 7 is equal to zero. With this counter 7

ny converter 4, speed converter 5, multiplication unit 6, counter 7, analog-to-digital converter (ADC) B, switch

9 modes of operation, block 10 averaging, 20 makes the average value of the mass code

(tare mass), coming from the ADC 8 The Setup command comes from the switch of 9 modes to the first AND 14 circuit.

container subtraction unit 11, memory 12, multiple input circuit And 13, two circuits And 14 and 15 and adder 16, with the output of the force-measuring transducer 4 connected to the input of the ADC 8, the output of which is connected to the information input of the averaging unit 10 and to the summing input The unit 11 for subtracting tare, the output of which is connected to one input of multiplication unit 6, the other input of which is connected to the output of converter 5 and to the counting input of counter 7, the outputs of the lower bits of which are connected to the inputs of the multiple input circuit I 13, the output of which is connected to the first inputs of the first 14 and second 15 circuits And and with the control input of the averaging unit 10, the output of which is connected to the information input of the storage device 12, the output of which is connected to the subtractive input of the container subtraction unit 11, and the address input to the output of the adder 16, the first input which is connected to the outputs of the higher bits of counter 7, the second to the second input of the second circuit 15 and the second output of the switch 9 operating modes, the first output of which is connected (tare) coming from the ADC 8. The Setup command comes from the switch 9 p presses the first AND gate 14.

25 By the time the current section of the load receiving mechanism 3 completes its passage in the averaging block 10, the average value of this section for the tare mass is formed. At the time of passing by the boundary of the section of the belt of the load-receiving mechanism 3, the lower bits of the counter 7 become equal to one.

At the output of the multi-input circuit And 13

35, a sign of the end of the tape section is formed, which is fed to the inputs of the averaging unit 10 and the first AND circuit 14. At the same time, the corresponding output is fixed at the output of the averaging unit

40 the final section of the tape is the average value of the tare mass, and at the output of the first circuit And 14 a signal is generated. Record allowing writing information into memory 12.

45 from averaging unit 10.

The address at which the information is recorded is formed by the adder 16 as the sum of the tape segment number (high bits of the counter 7)

To the second input of the first circuit, And 14, 50 "commands - Measurement (in the setup mode, the Measure command is zero).

the output of which is connected to the first control input of the memory 12, the second control input of which is connected to the output of the second circuit 15.

Scales work in setup and measurement modes.

In both modes, the signal of the force-measuring converter 4, proportionally counts the pulses of the speed converter 5, following with a frequency proportional to the speed of the belt feeder 2, and the averaging block 1-0 determines the average value of the mass code

(tare weight), coming from the ADC 8. The Setup command comes from the 9 mode switch to the first And 14 circuit.

By the time the current section of the load receiving mechanism 3 completes its passage in the averaging block 10, the average value of this section for the tare mass is formed. At the moment of passing the border of the area of the load-carrying mechanism tape 3, the lower bits of the counter 7 become equal to one.

At the output of the multi-input circuit And 13

a sign of the end of the tape section is formed, which is fed to the inputs of the averaging unit 10 and the first AND circuit 14. At the same time, the corresponding output is fixed at the output of the averaging unit

the final section of the tape is the average value of the tare mass, and at the output of the first circuit And 14, a signal is generated.

from block 10 averaging.

The address at which the information is recorded is formed by the adder 16 as the sum of the tape segment number (high bits of the counter 7)

“Commands- Measurement (in the setup mode, the Measurement command is zero).

Thus, in the memory 12 at an address equal to the number of the tape section, the average tare weight corresponding to that section is recorded. With the arrival of the next pulse from the speed converter 5, the lower bits

counter 7 becomes equal to zero, and the code of the high bits increases by one. In this case, the sign of the end of the tape section is removed, which causes a reset of the information in the averaging block 10 and the removal of the Record signal, after which the described operation is repeated for the next tape segment.

In the storage device 12, an array of average values of tare mass is formed, the addresses of the elements of which correspond to the numbers of the tape sections.

Measurement mode

All bits of counter 7 are equal to one. At the same time, the multi-input circuit And 13 forms a sign of the end of the section, and the second circuit 15 on the basis of this sign and the Measurement command, coming from the mode switch 9, forms the Read command.

From the storage device 12, the value of the tare mass for the zero portion of the tape is read at the address formed by the adder 16. This value is subtracted in the container subtraction unit 11 from the mass code from the ADC 8.

The obtained value of the corrected mass is multiplied in block 6 by multiplying by the speed signal from the converter 5 speed. The tare value of the tare mass remains at the output of the memory until the lower bits of the counter become equal to one again. At the same time, the next section of the tape is transferred to the load-receiving unit 3 and the address of the information in the storage device 12 is increased by one and the Read command is formed.

From the storage device 12, a new tare mass value is read that corresponds to the tape section located on the load receptor.

The weights may inaccurately determine the position of the tape caused by the accumulation of an error in the counter 7, which can cause an error during the formation of the Address signal and the reading of the tare mass from the memory and its device 12.

To eliminate this error during the passage of the movable part of the sensor 17 associated with the conveyor belt.

an electric circuit closes past its fixed part and the signal from the output of sensor 17 is fed to the input of the zero setting of counter 7. After each turn of the conveyor belt, an error of determining its position, accumulating in counter 7, is quenched.

Claims (2)

1. Conveyor scales containing a hopper mounted above the feeder, under the belt of which a load-receiving mechanism associated with a load transducer, a speed converter and a multiplication unit are built, characterized in that an analog-to-digital converter is inserted in order to increase the weighing accuracy , mode switch, averaging unit, container subtracting unit, memory device, multiple input circuit AND, two AND circuits, and adder, the output of the force-measuring converter connected to the input ohm analog-to-digital converter, the output of which is connected to the information input of the averaging unit and to the summing input of the container subtracting unit, the output of which is connected to one input of the multiplication unit, the other input of which is connected to the output of the speed converter and to the counting input of the counter, the lower-order outputs of which connected to the inputs of the multi-input circuit And, the output of which is connected to the first inputs of the first and second circuits And and to the control input of the averaging unit, the output of which is connected to the information input I remember device, the output of which is connected to the subtracting input of the container subtracting unit, and the address input to the output of the adder, the first input of which is connected to the outputs of the higher bits of the counter, and the second input to the second input of the second circuit AND and the second output of the operation mode switch, the first the output of which is connected to the second input of the first circuit AND, the output of which is connected to the first control input of the storage device, the second control input of which is connected to the output of the second circuit I. 0 five 0 five 0 five 2. Scales POP.1, characterized in that they are introduced 513740586 sensor of the installation of the beginning of the conveyor house; installation of the zero belt length counter, the output of which is connected to the inlet belt. (five and. / 7 four 13 Su FSE 31 fie.g -AND :