SU861962A1 - Conveyer scales - Google Patents

Description

I

The invention relates to the field of weighing equipment, in particular to devices for weighing continuously incoming cargo during its feeding.

Known conveyor scales, containing the most frequent weight sensors connected to the adder, the output of which, together with the output of the pulse speed sensor, is connected to a digital integrator connected to the final counter 1.

The disadvantage of these scales is the absence of a signal of instantaneous performance of the conveyor, which makes it difficult to use them in systems of automatic control of technological processes.

Nearby to the technical entity are belt scales, containing a weight sensor connected to one input of the permitting circuit, a speed sensor, a final counter, and an output transducer 2.

Their disadvantage is inadequate accuracy due to the use of an analog signal in the operation of multiplying the signals of the weight and velocity sensors.

The purpose of the invention is to improve the measurement accuracy.

This is achieved by introducing the first H second pulse generator into the weighing belt, a memory cell, a trigger, an instant performance counter and an additional permitting circuit, the speed sensor being connected to the trigger input, the direct output of which is connected to the first pulse generator connected with another input of the permitting circuit, the output of which is connected to the final counter and to one input of the additional permitting circuit, another input connected to the output of the second pulse driver, the input of which The second and control inputs of the memory cell are connected to the inverse output of the trigger, and the output of the additional permit circuit is connected to the input of the instant performance counter, the output of which is connected to the output converter via the memory element.

Claims (2)

Eve drawing shows the structure of the scale conveyor. Conveyor scales contain speed sensor 1, sensor 2, enable circuit 3, total counter 4, trigger 5, first pulse generator 6, second pulse generator 7, additional resolution circuit 8, instant performance counter 9, memory cell 10 and output converter I. Conveyor scales work as follows. The pulses from the speed sensor 1 arrive at the counting input of the trigger 5 and cause the alternating appearance of signals at its direct and inverse outputs, which causes the push-pull mode of the balance. In the first cycle, the signal from the direct output of flip-flop 5 is applied to the input of the first driver of 6 pulses, the output of which Po is a rectangular pulse, and the duration of the pulses of the first generator of 6 is constant and less than the minimum value of the pulse duration period of the sensor 1 or the minimum duration one measure. The rectangular impulse of the first driver 6 is fed to the control input of the resolving circuit 3, which causes the pulses of the weight sensor 2 to pass to the output of the permitting circuit 3 during the pulse time of the first driver 6 of the pulses. The pulses from the output of circuit 3 are fed to the inputs of counter 4 and the resolving circuit 8. Since the frequency of control pulses of circuit 3 is proportional to the frequency of the pulses of speed sensor 1, and therefore proportional to the speed of movement of the conveyor belt, the first counter 4 records the number of pulses of the weight sensor 2, proportional to the weight of the load moved by the conveyor. In the second cycle, the direct output is closed and the inverse output of the trigger 5 opens. The signal from the inverse output of the trigger 5 is fed to the input of the second driver 7 pulses, the output of which is a pulse whose duration is constant and does not exceed the sum of the minimum duration of one clock cycle and the duration pulse first shaper 6 pulses. In addition, the pulse duration of the second driver 7 pulses must be greater than the duration of one clock cycle, which is ensured by selecting the working frequency range of the speed sensor 1. The rectangular pulse of the driver 7 is fed to the control input of the permitting circuit 8 and opens it for the duration of its operation. The impulses of the weight sensor 2 will be; pass to the input of the second counter 9 lshp in the case when both permitting circuits 3 and 8 are open. It follows from the above that in the second cycle at the input of the counter 9 there are no signals, and in the first cycle to the input of the counter 9 there are pulses of the weight sensor 2 during time equal to the difference of the pulse duration of the driver 7 pulses and the duration of the previous second cycle. Consequently, when the speed of the conveyor nen-t decreases, the pulse frequency of the speed sensor 1 decreases, the duration of one cycle increases, and the transit time of the weight sensor 2 pulses through the resolution circuit 8 to the counter 9 decreases. conveyor and the number of pulses counted by the counter 9 for two cycles, corresponds to the value of the instantaneous performance for the same time. In the second cycle from the inverted output of the trigger 5, the signal also goes to the memory input of the memory cell 10, which reads the counted number of pulses from the counter 9 and simultaneously counts the counter 9. The number of pulses recorded in the memory cell 10 is output to the output converter And, which serves as a device for coordinating the output of belt scales with the regulating and recording equipment of the systems for regulating and controlling technological processes. The economic efficiency of using the described belt scales consists in increasing the accuracy of measurement, in the possibility of digital regulation and control. Formula from shadow Conveyor scales containing a weight sensor connected to one input of a resolution circuit, a speed sensor, a total counter and an output transducer, characterized in that, in order to improve accuracy, the first and second pulse shapers are inserted into them, the memory cell trigger, an instant performance counter and an additional enable circuit, the speed sensor being connected to the trigger input, the direct output of which is connected to the input of the first pulse generator connected to another input circuit, the output of which is connected to the total counter and to one input of an additional permitting circuit, another input connected to the output of the second pulse former, whose input and control input of the memory cell are connected to the inverse output of the trigger, and the output of the additional permitting circuit is connected to the counter input instant production58619626 water content, the output of which is through element1. USSR Copyright Certificate W 684319, The memory is connected to the output transducer. G 01 G 11/14, 1977. Information sources, 2. USSR author's certificate N 513261, taken into account during examination. G 01 G 11/12, 1974 (prototype). f // fff / /