JPH03220425A - Weighing apparatus - Google Patents

Abstract

PURPOSE:To enable more accurate determination of a static weight value of an object of weighing, by providing a subtracting element which determines a value obtained by subtracting the static weight value determined by a first weight computing element from the static weight value determined by a second weight computing element. CONSTITUTION:When a horse, which is an object of weighing, is weighed, for instance, first a man as a guiding body guides the horse, with reins in his hand, onto the entrance side of a weigher 2 and the man gets ahead on the weigher 2 from a pedestal 1 and stops thereon. Then a first weight computing element S1 determines a static weight value of the guiding body from weighed value data sent from the weigher 2 while the guiding body alone is on the weigher 2. Next, a second weight computing element S2 determines a static weight value being the sum of the values of the guiding body and the object of weighing, from the weighed value data sent from the weigher 2 while the guiding body and the object of weighing are on the weigher 2. Then, a subtracting element S3 subtracts the static weight value determined by the first weight computing element S1 from the static weight value determined by the second weight computing element S2 and determines the static weight value only of the object of weighing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a weighing device that weighs a guide object and a weighing object located behind the guide object by moving them over a weighing device.

[Conventional technology]

For example, if the object to be weighed is a horse and the guiding object is a human, the human first holds the reins and guides the horse toward the entrance side of the weighing device. Then, with the human and horse standing side by side, the human walks along the side of the weighing device, and the horse walks on the weighing device. As a result, only the weighing value data of the horse is outputted from the scale, and the static weight value of the horse is determined by the weight calculation means.

[Problem to be solved by the invention] Humans and horses are connected through reins, so if a human pulls the reins too hard and tension is applied, the weight value output from the scale will fluctuate. May have an undesirable effect on static weight values. Although the error in the static weight value due to fluctuations in the weighing value is minute compared to the horse's weight, it cannot be ignored when weighing requires precise measurement. Furthermore, since humans and horses often walk side by side, there is a risk that the horse may miss the scale and not be sufficiently loaded, and improvements have been desired from these points as well.

The purpose of the present invention is to eliminate the influence of force that acts when guiding a guide object or an object to be weighed, to prevent the object to be weighed from protruding from the weighing device, and to more accurately determine the static weight value of the object to be weighed. The aim is to meet the needs of the people.

Means for Solving Two Problems] In the weighing device according to the present invention, the static weight value of the guiding object is calculated from the weighing value data from the weighing device while only the guiding object is on the weighing device. First thing to ask for
A weight calculating means calculates a static weight value of the combined guided object and the weighed object from weight value data from the weighing device while the guided object and the weighed object are on the weighing device. A second weight calculating means to calculate the first weight from the static weight value calculated by the second weight calculating means.
The first characteristic configuration is that a subtraction means is provided for obtaining a value obtained by subtracting the static weight value obtained by the weight calculation means.

Further, the first weight calculation means is configured to extract a data portion in which the amplitude of the weighed value data falls within a set range, and calculate a static weight value of the guiding object based on the data. A second characteristic configuration is that a notification means is provided to notify the end of the weight calculation by the first static weight calculation means.

[Function] According to the first characteristic configuration, first, the static weight value of the guide object is calculated by the first weight calculating means or from the weigh value data from the scale while only the guide object is on the scale. demand. Next, the second weight calculation means calculates the static weight value of the guide object and the weighing object from the weighing value data from the scale while the guide object and the weighing object are on the scale. Then, the subtraction means subtracts the static weight value determined by the first weight calculation means from the static weight value determined by the second weight calculation means to obtain the static weight value of only the object to be weighed.

According to the second characteristic configuration, the first weight calculation means extracts a data portion in which the amplitude of the weighed value data falls within a set range, and determines the static weight value of the guide object based on the data. The notifying means notifies the end of the weight calculation by the first static weight calculating means and prompts the weighing object to be guided onto the guiding object or the weighing platform. The static weight value of the guiding object is determined in a state where no force associated with guiding acts between the guiding object and the object to be weighed, such as by standing still on the guiding object. After the notification is made by the notification means, the object to be weighed is guided onto the weighing platform, and the weighing device is moved along with the weighing platform to determine the static weight values of the guided object and the object to be weighed. Then, subtract the static weight value of only the object to be weighed from the static weight value that is the sum of the guided object and the object to be weighed,
The balance calculates the static weight value of only one object.

〔Effect of the invention〕

With the first characteristic configuration, it is possible to eliminate the influence of forces that act along with guidance. Furthermore, since the object to be weighed is moved past the scale with the guiding object leading above the scale, it is possible to effectively prevent the object to be weighed from protruding from the scale. As a result, the static weight value of the object to be weighed can be determined more accurately.

With the second characteristic configuration, it is possible to quickly and reliably know when the calculation of the static weight value of the guiding object is completed, so the process from calculating the static weight value of the guiding object until placing the weighing object on the scale is possible. There is no need to waste time in between, and weighing can be done more efficiently.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 6 and 7, a pedestal (1) with a rectangular hollow in the center is installed, and a weighing device is placed inside the hollow. (
2) and a measurement processing device (H) installed on the lateral side of the pedestal (1) to constitute a weighing device used for weighing horses.

The pedestal (1) is intended to make the difference in height between the scale (2) and the ground less noticeable so that the horse can easily climb onto the scale (2). The upper surface of the pedestal (1) is formed to be flush with the scale (2) at a portion adjacent to the periphery of the scale (2), and to slope downward when separated from the scale in the front and back directions.

The weighing device (2) has a structure in which the four corners of a weighing platform (2a) are supported by four load cells (2b).

A slight gap is provided between the weighing platform (2a) and the pedestal (1) to prevent the load applied to the weighing platform (2a) from being dispersed toward the pedestal (1). The size of the weighing platform (2a) is set so that the length of the weighing platform (2a) is such that the horse can take just four steps on its front legs while fully mounted, and the width is set such that the horse's head can pass through it.

As shown in FIG. 1, the measurement processing device (H) includes an input section (3) that receives and receives a weighing value signal (analog electrical signal) that is the sum of the detection signals of the four load cells (2b);
The receiver sequentially captures and stores the received weighing value signals as time-series weighing value data, and then sends them to the central control unit (4) which calculates the static weight value.
), a display section (5) for displaying the static weight value, and a buzzer (6) for notification.

The input section (3) includes an amplifier (3A) that amplifies the weighed value signal, a low-pass filter (3B) that smoothes the output of this amplifier, and A that quantizes the smoothed signal at a predetermined sampling time. /D converter (3C).

The central control unit (4) is configured to control the sample-linked ffj
A storage unit (M) that stores real time series weight value data for a certain period of time; a first weight calculation unit (S1) that calculates a static weight value of a human being from the weight value data; and the second to calculate the combined static weight value of the horse.
It consists of a weight calculation section (S2) and a subtraction section (S3) that calculates the static weight value of the horse alone by subtracting the calculation result of the first weight calculation section (S1) from the calculation result of the second weight calculation section (S2). ,
It consists of a microcomputer as the main part.

Next, we will explain the procedure for weighing a horse and the process of determining the static weight of a horse using the measurement processing device (old version).

When weighing a horse, first a human takes the horse's reins and guides it to the entrance side of the weighing machine (2).
Step 1) onto the scale (2) and stop. At this time, keep the reins relaxed. Eventually, when the buzzer (6) sounds, pull the reins to guide the horse onto the weighing machine (2), and start walking with the horse on the weighing machine (2) toward the exit, and then pull the reins to guide the horse onto the weighing machine (2). Descend to the pedestal (1) from the exit side.

In the input section (3), the amplifier (3A) amplifies the signal from the load cell (2b) that is output when a person or horse walks on the scale (2), and outputs the signal as shown in FIG. to an analog weighing value signal.

This analog weighing value signal is passed through a low-pass filter (3B).
3 to remove harmonic components and obtain a smoothed analog signal as shown in FIG. Furthermore, this smoothed analog signal is quantized by an A/D converter (3C) at a predetermined sampling time. In the graph of Fig. 3, the area indicated by a is a state in which only a human is completely riding on the scale (2), and the area indicated by b is a state in which both a human and a horse are riding on the scale (2). In the area indicated by C, only the horse is riding on the weighing device (2).

When weighing is started and the quantized weight value data (hereinafter simply referred to as weight value data) exceeds a set value (K+) that is smaller than the weight of an average person, it is determined that the weight of the human being is V<2>
As shown in FIG. 4, the weighing value data is sequentially taken in as a sample link series, stored in the storage section (M), and how many of the first weight calculation means (S1) are calculated. The thickest value and the smallest value of the amplitude of the value data, as well as the difference between them, are determined at any time. When this difference becomes less than the set value, it is assumed that the weighing value data is stable, and the static weight of a person is determined by calculating the average of multiple (for example, 10) consecutive weighing value data starting from the minimum value at that time. Furthermore, when the resting weight of the person is determined, it is output to the display section (5) for display, and a buzzer (6) is sounded to notify that the calculation has been completed. Incidentally, a person's resting weight can be determined within one second.

As mentioned earlier, the person who heard the buzzer guided the horse and placed it on the scale (2), then started walking ahead of the horse towards the exit, and eventually reached the scale (2). From the exit side to the pedestal (
Descend to 1).

During this time, the weighing data of the human and horse while walking is sequentially taken in as a sampling series and stored in the storage unit (4A).
is stored in If the weighing shift data falls below a set value (K2) that is smaller than the average horse's weight, the horse will be weighed on the scale (2).
), storage of weighed value data stops.

Then, the second weight calculation means (S2) uses the gait periodicity evaluation section (4B) to determine the maximum value Wmax from the weighed value data group stored in the storage section (4A), and calculates the maximum value Wmax as shown in FIG. This maximum value: A data group having a value of 80% or more of Wmax is regarded as a weighing value data group when the full weight load of a human and a horse or the full weight load of a horse is applied to the scale (2). At the same time, the walking periodicity is evaluated from this weighing value data group by examining its maximum value.

Maximum values occur when one of a person's legs is lifted, or when one of a horse's hind legs is lifted. However, since the static weight value of a horse is nearly 10 times the static weight of a human, if both the human and the horse walk on the scale (2) at the same time, only the maximum value associated with the horse's walking will occur. appears. Based on the length of the scale (2), it takes 4 steps for the horse to walk when both the human and the horse are fully mounted, and it takes 2 steps for the horse to walk with only the horse fully mounted after the human dismounts. As shown in FIG. 5, the maximum values are Wl, W2. W3. W4. W
Six S and W6 will appear.

The minimum value: WS between the first maximum value Wl and the second maximum value W2 is determined, and starting from the point at which this minimum value: WS appears, the maximum value: W4 appears multiple times, in this case, the fourth time. A valid data section (T) is set with the time point as the end point. However, the first maximum value: Wl is excluded from the valid data interval (T) because it has been confirmed through experiments that it tends to be smaller than other maximum values, and it can be considered as unreliable weighing value data. It is from.

In addition, the reason why the three maximum values are included in the effective data interval (T) is that a weighing value data group that includes at least three maximum values is required to calculate an accurate static weight value.
This is because the fifth and subsequent maximum values: WS and W6 are the maximum values that appear when a person dismounts and walks only on a horse or on the scale (2).

Further, the second weight calculating means (S2) averages the sampling data within the valid data interval (T) and calculates the static weight value of the total weight of the human and the horse.

When the static weight value of the total of humans and horses is determined, the subtraction unit (S3) subtracts the previously calculated static weight value of only humans from the static weight value to obtain the static weight value of only horses. The static weight value is immediately output to the display section (5) for display.

[Another example]

(a) In the previous embodiment, a human rides on the weighing device (2) and, after coming to rest, the horse is guided onto the weighing device (2). If it were possible to calculate the static weight value of a human weighing a horse while walking on the scale (2), it would be possible to
It can also be guided upwards.

b) Various methods can be considered for the first weight calculation means (SL) to determine whether or not the weighed value data is stable. For example, the weighing value data may become stable after a predetermined period of time has elapsed since the first maximum value was detected. It is also possible to detect the point in time when the vehicle (2) starts to descend or the point in time when it finishes descending from the vessel (2), and specify the effective data section (T) based on that information. can be applied to things other than humans, and the weighing object can be applied to things other than horses, such as cows.

It should be noted that the present invention is not limited to the structure of the attached drawings by adding or writing numerals in the claims for convenient comparison with the drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the weighing device according to the present invention, in which Fig. 1 is a functional block diagram, Fig. 2 is a graph showing an analog signal of a weighed value, and Fig. 3 is a low-pass filter applied to the signal in Fig. 2. Figure 4 is a graph showing the sampling status of area a of the graph in Figure 3, Figure 5 is a graph showing the sampling link status of area b, and Figure 6 is a plan view of the subsequent signal.
FIG. 7 is a side view. (S1)...First weight calculation means, (s2)...
...Second weight calculating means, (S3)...Subtraction means, (2)...Weighing device, (6)...
Notification means.

Claims (1)

[Scope of Claims] 1. A weighing device that weighs a guide object and a weighing object located behind the weighing object by moving them over a weighing device (2), wherein only the guiding object is weighed by passing over a weighing device (2). 2) first weight calculation means (S) for calculating a static weight value of the guiding object from weighing value data from the weighing device (2) while riding on the guiding object;
1), and from the weight value data from the weighing device (2) while the guiding object and the weighing object are on the weighing device (2), the guiding object and the weighing object are combined. a second weight calculating means (S2) for calculating the static weight value determined by the second weight calculating means (S2); and a static weight calculated by the first weight calculating means (S1) from the static weight value calculated by the second weight calculating means (S2). A weighing device provided with a subtraction means (S3) for obtaining a value by subtracting a value. 2. The weighing device according to claim 1, wherein the first weight calculation means (S1) extracts a data portion in which the amplitude of the weighed value data falls within a set range, and based on that data, the first weight calculation means (S1) configured to determine a static weight value of the guided object;
A weighing device comprising a notification means (6) for notifying the completion of weight calculation by the first weight calculation means (S1).