SU1183839A1 - Arrangement for weighing moving objects - Google Patents

Abstract

A DEVICE FOR THE PROMOTION OF MOVING OBJECTS containing a force-measuring transducer, connected to a microprocessor-based computing device and one input of a memory unit, the other input of which is connected to the output of a microprocessor-based computing device, and path sensors, different in that, in order to improve the accuracy at the expense of more compact devices, moreover, in order to improve the accuracy by means of a computing device, which, in order to improve the accuracy, at the expense of more compact devices, moreover, more than that, in order to improve the accuracy by means of a computer, there are more than one expense of which, in order to improve the accuracy of the computer, it is connected to the expense of other devices connected to the microprocessor. suppression of dynamic interference, a counter with a control device, two registers and two comparison devices are entered into it, the outputs of the comparison devices are connected with the information inputs of the meter control device, the control input of which is connected to the track sensors, the first output is connected to the input of the microprocessor computing device, and the second - with the first input of the counter, the second input of which is connected to the synchronous output of the microprocessor computing device, the input is connected to the output of the first register, and the output is connected to the input from the microprocessor computing device and the inputs of the comparison devices, the other inputs of which are connected to the outputs of the respective registers, the inputs connected to the output of the microprocessor computing device. co 00 co co

Description

11 The invention relates to a weighing equipment, and more specifically to devices for weighing objects during their movement. The purpose of the invention is to increase the accuracy due to more complete suppression of dynamic noise. Figure 1 presents the block diagram of the device; 2 shows graphs explaining the operation of the device. The device contains a weighing platform 1, track sensors 2 and 3, a force-measuring transducer 4 embedded in the platform, a microprocessor-based computing device 5 which includes a central processor 6, read-only memory 7, a control device 8 and a synchronizer 9. The input of the device 5 is connected to the outputs of the force-measuring converter 4 and the memory block-10. The interrupt input of the device 5 is connected to the output of the control meter device 11, 12, the second input of which is connected to track sensors 2 and 3, and the output to the counter 12, the second input of which is connected to the synchronization output of the device 5, and the output is connected to the input of the device 5 and The codes of devices 13 and 14 are compared. The output of the device 5 is connected to the input of the memory block 10, the indicator 15 and the inputs of the registers 16 and 17, the outputs of the registers 16 and 17 are connected to the second inputs of the comparison devices 13 and 14, respectively, whose outputs are connected to the inputs of the counter control device 11. The output of the register 16 connected to the third input of the counter 12. The device operates as follows. When a wheel hits a weighing plate, Form 1, the track sensor 2 is triggered by the signal from which the meter control device 11 is started. The meter control device 11 generates an interruption signal fed to the central processor 6, on which the information processing program recorded in constant the memory device 7 of the microprocessor computing device 5. From the converter 4, through the data input input to the device 55 15, information on the measured weight with the polling period is received, corresponding to sample rate. 9. 2. All discrete weight samples are recorded in memory unit 10 and, at the same time, by comparing the discrete samples in the central processor 6, the maximum and minimum values of the measured discrete samples are searched. The cell addresses of the memory block 10, in which the minimum and maximum values of discrete samples are written,,, are entered into registers 16 and 17, respectively. By a signal from the track sensor 3, which signals the departure of the wheel from platform 1, the counter control device 11 generates a signal whereby the central processor 6 is transferred to the execution of a digital filtering routine, the algorithm of which is recorded in the persistent storage device 7. To obtain a high accuracy in measuring weight, for example, 0.1%, in the presence of dynamic interference a Mplitudoi 10-20% of the useful signal, it is necessary to ensure the suppression of this interference by 40-50 dB. Obtaining this degree of suppression with limited measurement time is possible with digital filters, usually synthesized by the time window method. The device uses a non-recursive digital filter with a Dolph-Chebyshev window, the constant component of which is determined by the formula N-X (Mi, (1c),, N .0 N is the number of counts in the observation window; x (1) - time counts input signal; u) (k) - window time samples $ Vg - constant component of the input signal. Practically, with the passage of the weighing platform, no more than 1.2-1.6 periods of dynamic disturbance are stacked, which is not enough to obtain the required suppression, and hence the measurement accuracy.

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In the proposed device, the number of periods of dynamic disturbance in the observation window is artificially increased. This is achieved by simultaneously with transferring the processor to the digital filtering subroutine, the counter control device 11 generates a signal on which the address code is written to counter 12 (PF register 16, after which counter 12 is switched to the pulse summing mode from the clock output of the device 5.

When increasing the contents of the counter 12 from the initial value of fN

The MICS at its output are formed the addresses of the cells of the U memory block, in which discrete samples of the measured input signal are recorded, which are selected in processor 6 and subjected to digital filtering.

At the same time, the current address code from the counter output is compared on the comparison device 14 with the value of the address code. When they are equal, the device 14 outputs the signal on which the counter control device 11 puts the counter 12 into the subtraction mode and the sample

838394

discrete values of the input signal from the memory block 10 is carried out in the opposite direction from ° C

At the same time, the code from the output of the counter 12 is compared in the device 13 of the comparison with the address 5

At the moment of comparison, the device 13 generates a signal, ps to which the control device 11 transfers 10 the counter 12 to the summation mode, and the cycle repeats.

Thus, to obtain the required suppression ratio of 40g 50 dB, the required number of tS periods (2.5-3) of the dynamic disturbance (Fig. 2) is accumulated, which ensures a higher accuracy of the weight measurement. After processing the information in the device 5 (digital filtering, mas20 scaling, etc.), the signal characterizing the measured weight of the moving object is displayed on the indicator 15.

When the weighing device is installed on a movable object (crane, trolley) for weighing the goods being moved, the control device is activated manually by the operator or according to the program from the five-shaft device 5.

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Claims (1)

DEVICE FOR WEIGHING MOVING OBJECTS, containing a power transducer, connected to a microprocessor computing device and one input of a memory unit, the other input of which is connected to the output of a microprocessor computing device, and track sensors, characterized in that, in order to increase accuracy due to more full suppression of dynamic noise, a counter with a control device, two registers and two comparison devices are introduced into it, and the outputs of the comparison devices are connected to the info the inputs of the counter control device, the control input of which is connected to the track sensors, the first output is connected to the Interrupt input of the microprocessor computing device, and the second is connected to the first counter input, the second input of which is connected to the synchronizing output of the microprocessor computing device, the third input is connected to the output of the first register and the output - with the input of the microprocessor computing device and the inputs of the comparison devices, the other inputs of which are connected to the outputs respectively constituents registers, inputs connected to the output of the microprocessor computing device. SU „, 1183839