SU830136A1 - Weighht measuring device - Google Patents

Description

(54) WEIGHT-MEASURING DEVICE

device and an increase in measurement error.

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

To achieve this goal, the autocompensator is equipped with a speed switch and a speed selector, while the speed selector contains a reversible frequency divider, at least two AND schemes and one OR circuit, and the speed selector node has two counters, an AND scheme, a decoder, and a register , the switching inputs of the reverse frequency divider are connected to the corresponding outputs of the zero-organ, the counting input is connected to the generator output, and the outputs are connected to the first inputs of the circuits AND the fast switch The outputs of these circuits are connected to the inputs of the OR circuit, the output of which is connected to the counting input of the reversible counter, and the first input of the AND circuit of the speed selector unit is connected to the output of the zero-organ, the second input of this circuit and the counting input of the first counter are connected to the output generator, and the output of the circuit AND is connected to the counting input of the second counter, while the output of the first counter is connected with the reset input of the second counter and the setup input of the register, and the outputs of the second counter are connected to the decoder inputs, the outputs of which connected to the installation inputs of the register, with this output of the register connected to the second inputs of the circuits AND speed switch.

The drawing shows the block diagram of the weight measuring device.

The device contains a weight bunker 1 supported by strain gauges 2 whose output signal enters the input circuit 3 of the following autocompensator containing a linear decoding converter 4, null organ 5, a reversing counter 6 and a generator 7. The clock pulses from the generator output are fed to the input of the speed switch 8 containing a frequency divider 9 frequency, two or more logic circuits AND 10 and one logical circuit OR 11. Logic control And 10 performs the node 12 speed selection, containing logical ical AND circuit 13, counters 14 and 15, the decoder 16 and the register 17.

The weighing device operates as follows.

The change in mass of the material in the weight bin 1 is converted by strain gauges 2 into a proportional analog electrical signal, which is algebraically combined in the input circuit 3 with the output signal of the linear decoding converter 4. The resulting difference of the two signals

is fed to the input of the null organ 5, which drives the reverse tires of the reversible counter b connected to the linear decoding converter 4 in such a way that the indicated difference of the signals tends to zero. At the same time, at the output of the reversible counter 6, a code is generated corresponding to the measured signal. The filling of the reversible counter b is carried out by pulses of the generator 7, the frequency of which, in order to limit the speed, of the weighing device is reduced by means of the reversing frequency divider 9. The speed limit is determined by selecting the appropriate AND 10 circuit that feeds the filling pulses to the input of the reversible counter 6 through the OR 11 logic, so that when the filling hopper 1 has a high filling speed, the high frequency pulses go to the input of the reversible counter B, and when the speed decreases when filling the weight bin, the frequency of the pulses accordingly decreases. The automatic determination of the filling rate of the weigh bin and, accordingly, the selection of the speed of the weighing device is carried out by the speed selection unit 12 as follows. During a certain time interval determined by the filling time of the counter 14, through the AND 13 circuit, the input of the counter 15 receives filling pulses, the number of which is proportional to the loading speed of the weigh bin. The code combination formed at the outputs of the counter 15 is fed to the input of the decoder 16, which converts this code combination to a series of output signals, each of which corresponds to a certain average filling speed of the weight bin for a specified time interval. The code combination obtained at the output of the decoder after overflow of counter 14 is rewritten into register 17, which selects the corresponding circuit AND 10. At the same time, counter 15 overflows the counter 15 to zero and the process of determining the filling rate of the weighing bin starts again.

Claims (2)

The proposed weight measuring device can be widely used in various weight and weight dosing systems for measuring slowly varying weights. In particular, it should be used to build discrete weighing dosing units, static weighing scales, weighing devices for weighing airplanes to determine the center of gravity, etc. This significantly improves the accuracy of measurement of the slowly varying weight of the weighed cargo in the case of a discrete metering unit, the metering accuracy of various bulk materials. In particular, when the frequency of the filling pulses at the output of the OR circuit is reduced by a factor of eight, the measurement error decreases, depending on tee on the physical properties of materials dosed 3-5 times. Claims Weighing device comprising a weighing bin supported by strain gauges, a phase-sensitive null organ, a reversible counter, a linear decoding transducer and a generator connected according to a follower autocompensator circuit, characterized in that, for the purpose of improving measurement accuracy, the follower autocompensator is equipped with a speedometer switch and node speed, while the speed switch contains a reversible frequency divider. at least two AND schemes and one. the OR circuit, and the speed selector node, two counters, the AND circuit, the decoder and the register, the switching inputs of the reverse of the reverse frequency divider are connected to the corresponding zero-body outputs, the counting input is connected to the generator output, and the outputs are connected to the first inputs of the AND circuit switches speed, while the outputs of these circuits are connected to the inputs of the OR circuit, the output of which is connected to the counting input of the reversible counter, and the first input of the AND circuit of the high-speed selector node is connected to the output of the zero-organ, the second input of this circuit and the counting input of the first counter is connected to the output of the generator, and the output of the AND circuit is connected to the counting input of the second counter, while the output of the first counter is connected to the reset input of the second counter and the setup input of the register, and the outputs of the second counter are connected to the decoder inputs, the outputs of which are connected with the register setup inputs, the register outputs being connected to the second inputs of the circuits AND speed switch. Sources of information taken into account during the examination 1. USSR author's certificate No. 180258, cl. G 01 G 23/36, 1969. 2. USSR author's certificate number 306358, cl. G 01 G 23/16, 05.11.69 (prototype). / mw7 / 77: ff ///////////