SU1682820A1 - Method and device for weighing moving objects - Google Patents

Abstract

The invention makes it possible to increase the accuracy of weighing goods transported by vehicles in motion. To do this, several measuring sections with load cells 3-5 are placed in the path of the object, while track sensors 1 and 2 are placed in front of the first measuring section, and the speed of movement of the object and the distance between its axes are determined from their signals. Then, successive measurements of the signals of the load sensors are used with a frequency equal to the ratio of the speed of movement to the length of the measuring section; 2 sec. and 1 z. p. f-ly, 3 ill.

Description

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This invention relates to a weight measuring technique.

The purpose of the invention is to improve accuracy.

The method of weighing moving objects consists in the fact that several measuring sections with load-measuring sensors are sequentially placed on the movement path of an object, track sensors are placed in front of the first measuring section, their signals determine the speed of movement of the object and the distance between its axes, produce sequential measurement of signals from load sensors with a frequency equal to the ratio of the speed of movement to the length of the measuring section, form a periodic signal by summing the direct latter is present on odd force measuring sensors and inverted signals from even force measuring sensors which, after digital filtering is used to calculate the weight.

The essence of the method lies in the fact that when the moving object moves along the measuring sections, a periodic signal is generated, the amplitude of which is directly proportional to the weight of the moving object and only. The sampling frequency of the load sensors is determined by the expression

,

where I is the length of the measuring section; v is the speed of movement of the object, determined by signals from track sensors located in front of the measurement areas at a given distance from each other. The signals of the load sensors are delayed by an amount determined by the speed of the object, so that after the end of the signal from the previous sensor, the signal from the next one starts. Thus, by summing the direct signals from the odd sensors and the inverse signals from the even sensors, we have a periodic signal. Then, the received signal is adaptively filtered by a digital filter tuned to a frequency of maximum harmonic component equal to f v / l. The amplitude of the highlighted harmonic depends proportionally on the weight of the moving object.

Fig. 1 shows a block diagram of a device for weighing moving objects, in which the method described is implemented; figure 2 - the location of the measuring stations and track sensors; on

FIG. 3 are graphs explaining the process of forming a periodic total signal.

The device contains the first 1 and second

2 track sensors, load sensors, the total number of which can be different, multiplexer 6, data input keyboard 7, generator 8 clock pulses, first key 9, first 10 and second 11

0 counters and the second key 12, the controller 13 interrupts, the microcomputer 14, programmable timers 15-17 (their number may be different) and the indicator 18.

Outputs of load sensors

5 are connected respectively to the inputs of the multiplexer 6. The output of the multiplexer 6 is connected to the information inputs (bus) of the microcomputer 14. The outputs of the traveling sensors 1 and 2 are connected to the first and second

0 inputs of keys 9 and 12 and the first and second inputs of the controller 13 interrupts. The remaining inputs of the interrupt controller 13 are associated with the corresponding outputs of the timers 15-17, the inputs of which are connected to

5 information input of microcomputer 14. The output of interrupt controller 13 is connected to information input of microcomputer 14. Generator output 8 of sync pulses is connected to third (control) inputs of keys 9 and 12 and microcomputer synchronous input 14, and information input of microcomputer 14 - with the input of the indicator 18. The outputs of the keys 9 and 12 are connected to the inputs of counters 10 and 11, the outputs of which are connected to the information input of the microcomputer 14, to which the keyboard 7 is also connected,

The first 1 and second 2 track sensors are located in front of the measuring areas at a distance of 0 between them, and at the distance S from the second sensor 2 there is an end of the support of the first measuring section. The measuring sections (total N) are attached to the edges along the edges, and in the centers contain load sensors. The distance of the measuring section between the supports is equal to I. The distance S is chosen, based on the time required to perform the required calculations and initialize the hardware to receive information. The measuring section is a reinforced concrete base with rigidly embedded steel.

5 carriers (on the railway - these are rails).

The device works as follows.

When the wheel of a moving object passes through the first sensor 1, it is generated. coming on the first key 9 and the controller 13 interrupts. The key 9 opens and the pulses from the generator 8 clock pulses arrive at the counter 10. Using the same pulse from the track sensor 1, the interrupt controller 13 generates an interrupt command in the micro-computer 14. After the second track sensor 2 passes the moving object of the second track sensor 2 this sensor. The state of the counter 10 determines the time the wheel travels the distance between the first sensors 1 and 2. According to the distance 1 ° (known) and the time found, the speed of the object is determined. The pulse of the sensor 2 when passing through the wheel also allows the pulse counting of the generator 8 sync pulses by the second counter 11. The counting continues until the next wheel arrives at the first track sensor 1, the signal of which causes the microcomputer 14 to interrupt through the interrupt controller 13. According to this interruption, microcomputer 14 interrogates the state of the second counter 11, which determines the distance between adjacent wheels of the vehicle (if it is unknown) by a known speed and time.

The distance between the wheels is used to identify a single moving object in a column of equivalent objects. From the speed and distance I of the measuring section between the sensors, the sampling frequency f v / l is determined. The result obtained is loaded into one of the timers 15-17 and starts it with a constant time determined by the speed of movement of the wheel of the moving object. After a predetermined time, determined by the loaded value, the corresponding timer generates an interrupt signal, through the interrupt controller, the microcomputer 14 begins to take data from the force-measuring sensor on which the wheel is located. As is known: the speed v of the wheel, the distance I of the measuring section between the supports and the width H of the support of the microcomputer 14 calculate the position of the wheel on the path, the number of necessary sensor choices on a given section of the path and the number of the measuring section. Similarly, the process of polling the remaining load sensors is carried out. The microcomputer 14 generates a periodic signal by summing the direct signals from odd force sensors and inverse sensors from even and delaying signals so that after the signal from the previous sensor ends, the signal from the next one starts (fig. 3e-e). Most of the signal power (about 60% or more) comes from the first harmonic. Digital filtering periodic

The signal with the frequency f v / l (i.e., the center frequency of the filter bandwidth is given by this voltage) gives only an information signal proportional to the weight (the constant component is 0).

In the described method and device it implements, in contrast to the known, when changing one of the destabilizing factors, for example, temperature,

5, the signal from the force-measuring sensors will also change (Fig. 2a-d, dashed line), and as a result of the formation of a periodic signal, there will be a change in the magnitude of the constant component, but

The weight is judged by the magnitude of the harmonic amplitude, the frequency of which is determined by the speed of the object and the length of the measuring section, which leads to an increase in the weighing accuracy.

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Claims (3)

1. The method of weighing moving objects, which consists in placing track sensors on the path of the object and 0 of the measuring section with a force-measuring sensor, the signal of which, after digital filtering, is used to calculate the weight, characterized in that, in order to improve the accuracy, 5 object movements sequentially place several measuring sections with load sensors, and track sensors are placed in front of the first measuring section, their signals determine the speed of the object and the distance between its axes, make successive measurements of the signals of load sensors with a frequency equal to movement speed to length 5 of the measuring section, they form a periodic signal of summation of direct signals from odd force sensors and inverse signals from even force sensors, which is used to calculate the weight after digital filtering. 2. A device for weighing moving objects, comprising a measuring section with a force measuring device. 5 sensor, the first and second track sensors, the first pulse counter, micro-computer, with the information input of which the indicator is connected, and with the synchronous input - the output of the clock generator, characterized in that, in order to increase accuracy, additional measuring stations with load cells, a multiplexer, a second counter, programmable timers, an interrupt controller, a data entry keyboard and the first and second keys were entered, the outputs of the load cells through the multiplexer are connected to the information bus of the micro-computer, The inputs of the programmable timers, the outputs of the first and second counters, the output of the interrupt controller, and the output of the keyboard for data input, are informational to. . SI H 0 the inputs of the first and second keys and two inputs of the interrupt controller are connected to the outputs of the first and second track sensors placed in front of the first measuring section, the control inputs of the first and second keys are connected to the outputs of the clock generator, and the outputs to the inputs of the first and second counters, respectively. 3. The device according to claim 2, characterized in that the edges of the measuring sections are rigidly fixed, and the load sensors are located along the centers of the measuring sections. 1R yy yy Basic but t E.Savina s Fi.3 Compiled by V.Shirshov Tehred M. Morgental L & J LЈJ FIG. Z Proofreader M. Pojo