JPH0690070B2 - Step-out detection device for weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] In the present invention, a pedestal is provided in an adjacent state around a weighing machine for weighing animals, and the upper surface of the weighing machine and the upper surface of the pedestal have the same height. Relates to a weighing device formed in.

[Conventional technology]

For cowardly animals such as horses, not only do weigh scales with fences, but also flat scales without fences on the ground, there are only steps I don't try to get there easily. Therefore, a pedestal is used to hide the step between the ground and the weighing machine, and then a human holds the steel and guides the horse onto the weighing machine for weighing. In this case, since a human walks on the pedestal and only the horse rides on the weighing machine, the weighing value obtained from the weighing machine is only for the horse.

By the way, if the upper surface of the weighing machine and the upper surface of the pedestal are formed at the same height and are flush with each other, there is a risk that a part of the horse's foot may step off the weighing machine and step on the pedestal. In particular,
When walking on the balance and weighing in the meantime, the probability of overstepping is high. If the horse's foot rides on the pedestal, the weight of the horse is distributed toward the pedestal, and this amount becomes an error and is included in the weighing value output from the weighing machine.

In the conventional weighing device, a boundary line is drawn on the upper surface of the pedestal to clarify the boundary between the weighing machine and the pedestal, but it is possible to accurately determine whether or not one of the four feet has been stepped off while walking. It's hard to do. Therefore, as shown in FIG. 10, it is considered to attach a long rubber tube (9) along the boundary line so that the rubber tube (9) is slightly raised to make it easy to detect a stepping off.

[Problems to be Solved by the Invention]

However, even if it is easier to detect the stepping off with the rubber tube, it is impossible to accurately determine if the stepping off is subtle. Moreover, when the horse is walking or stepping on, the stepping off becomes a moment, and it becomes more difficult to find the stepping off. In addition, the horses resisted the climax, making it difficult to obtain satisfactory results.

The present invention has been made by paying attention to such an actual situation, and an object thereof is to make it possible to reliably detect the stepping off of the foot of the animal to be weighed, and to obtain a reliable weighed value. is there.

[Means for Solving the Problems]

A characteristic configuration of the present invention is that a sensor is provided for detecting that the foot of the weighing target animal on the weighing machine is in contact with the upper surface of the pedestal.

[Work]

During weighing, if the paw of the animal to be weighed touches the upper surface of the pedestal beyond the boundary between the weighing machine and the pedestal, it is detected by the sensor. You will be able to judge whether or not there is. If it is determined that the error is included, it is necessary to take measures such as weighing it again or correcting the error.

〔The invention's effect〕

It has become possible to easily obtain a highly reliable weighing value that does not include an error due to misstep. Also, since it is not necessary to check whether or not the horse has stepped off, it is possible to weigh efficiently.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, a pedestal (1) having a hollow central portion is installed, a weighing machine (2) is installed in the hollowed portion, and a side of the pedestal (1) is installed. A measurement processing device (H) is installed on one side to configure a weighing device used for weighing a horse.

The pedestal (1) is also for making the height difference between the weighing machine (2) and the ground inconspicuous so that the horse can easily go up to the weighing machine (2). The upper surface of the pedestal (1) is flush with the weigher (2) at a portion adjacent to the periphery of the weigher (2), and is inclined downward when separated from the front and rear. In addition, by making the width of the pedestal (1) slightly wider than the width of the weighing machine (2), it is possible for a man with hand steel to walk at the same height as the horse while guiding the horse. is there.

The weighing machine (2) has a structure in which four corners of a weighing table (2a) are supported by four load cells (2b). A small gap is provided between the weighing table (2a) and the pedestal (1) to prevent the load applied to the weighing table (2a) from being distributed to the pedestal (1). The size of this weighing platform (2a) is
The length is set so that a horse rides and advances two or three steps, and the width is set so that one horse can pass through.

A conductive tape (3A) is provided at a portion of the pedestal (1) and the weighing platform (2a) which are adjacent to each other so as to detect whether or not the horse has stepped off the weighing machine (2) during weighing. , (3B)
Are attached to each other while being insulated from each other. These tapes (3A) and (3B) form a pair of electrodes, the tape (3A) on the pedestal (1) side is grounded, and the weighing platform (2a)
The side tape (3B) is connected to the continuity detector (4) in the measurement processing device (H). In other words, the horse is a weighing platform (2a)
When stepping off, the legs contact the pedestal (1) and the two tapes (3A) and (3B) are conducted by the horseshoe (5) as shown in FIG.
By detecting the continuity of A) and (3B), it is possible to detect whether or not the horse has stepped off the weighing platform (2a). When the conduction is detected, a detection signal is sent from the conduction detector (4) to a central control unit (7) described later. In this embodiment, the tape (3A), (3B) and the continuity detector (4) constitute the sensor (S).

As shown in FIG. 5, the measurement processing device (H) receives an input unit (6) for receiving a weighing value signal (analog electric signal) obtained by adding the detection signals of the four load cells (2b), and receives it. Central control unit (7) for obtaining the static weight value by sequentially capturing and storing the weight value signal as time-series weight value data
And a display unit (8) for displaying the static weight value.

The input unit (6) has an amplifier (6A) for amplifying the weighing value signal, a low-pass filter (6B) for smoothing the output of the amplifier, and an A for quantizing the smoothed signal with a predetermined sampling time. / D converter (6C).

The central control unit (7) has a storage unit (7) for storing time-series weight value data of sampled weight values for a fixed time.
A), a gait periodicity evaluation unit (7B) that calculates the gait periodicity from the time series weighed value data, and valid data that sets a valid data section (T) from the time series weighed value data based on the gait periodicity. It is composed of a section setting section (7C) and a calculation section (7D) for calculating the static weight value of a walking horse from the time series weighted value data in the valid data section (T). is there.

Next, the procedure for weighing a horse and the processing for obtaining the stationary weight of the horse by the measurement processing device (H) will be described.

When weighing a horse, first hold the horse's hand steel and mount the pedestal (1).
Guide the horse to the center of the pedestal (1), walk straight on the scale (2), and lower the horse from the center of the pedestal (1). At that time, the human rides from the left and right sides of the pedestal (1) while holding the hand steel of the horse, walks straight on the left and right sides of the weighing machine (2) along with the horse, and from the left and right sides of the pedestal (1). Try to get off.

As the horse walks on the weighing machine (2), an analog signal indicating the weighing value as shown in FIG. 6 is sent from the load cell (7) as an amplifier output. In this graph, the area indicated by a is a state in which only the forefoot of the horse is on the scale (2), and the area indicated by b is the state in which the total weight of the horse is on the scale (2), The area indicated by c is a state in which only the hind legs of the horse are on the scale (2).

The output of this amplifier is passed through a low pass filter (6B) and becomes a smoothed signal as shown in FIG. Figure 8 shows
It is an enlarged view of the area shown by b above, and from this figure it can also be seen how the analog weighted value signal is sampled and quantized.

After the weighing is started, when the quantized weighing value data (hereinafter simply referred to as weighing value data) becomes larger than a set value (K) which is slightly larger than the weight of the weighing machine (2), the horse is weighed. As soon as the user starts riding on the vessel (2), the weighing value data is sequentially stored in the storage section (7A) as a sampling sequence.
The storage by the storage unit (7A) is continued over the sample data section (T ₀ ) until a fixed time elapses after the storage is started.

However, when the detection signal is sent from the continuity detector (4) to the central control unit (7), the acquisition of the weighing value data is stopped at that time and an error is displayed on the display unit (8). Is done.

Next, the walking periodicity evaluation unit (7B) obtains the maximum value: Wmax from the sampling data stored in the storage unit (7A), and the data group having a value of 90% or more of this maximum value is The total weight load of is regarded as the weighing value data group in the state of being placed on the weighing machine (2), and is specified as the weighing value data group.

Further, the gait periodicity evaluation unit (7B) evaluates the gait periodicity from the weighing value data group by examining its maximum value. In the case shown in FIG. 8, the maximum value is
There are five of W1, W8, W15, W23, W29.

Then, the valid data section setting unit (7C) sets the valid data section (T) with the time point at which the first maximum value W1 appears as the starting point, and the time point at which the maximum value W23 appears a plurality of times, here the fourth time, as the end point. Will be done.

However, in the setting of this effective data section (T), how many walking cycle peaks to include can be set in advance depending on the type of walking animal, the natural frequency of the weighing machine (2), and the like.

The computing unit (7D) averages the sampling data in the valid data section (T) set in this way, and the static weight value of the horse walking on the weighing machine (2) is calculated. The calculated static weight value is immediately displayed on the display unit (8).
Is displayed in.

[Another embodiment]

(A) As shown in FIG. 9, a sheet-shaped pressure sensor (10) is provided along the portion of the upper surface of the pedestal (1) adjacent to the weighing machine (2), and based on the information of this pressure sensor. It may be possible to detect that the horse has stepped off.

(B) The present invention can be applied to walking animals other than horses, such as cows, sheep and goats.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a stepping-off detection device for a weighing device according to the present invention. Fig. 1 is a plan view, Fig. 2 is a vertical sectional side view, Fig. 3 is a vertical sectional front view, and Fig. 4 shows a conduction state by stepping off. FIG. 5, FIG. 5 is a functional block diagram, FIG. 6 is a diagram showing an analog signal of a weighing value, FIG. 7 is a diagram showing a signal after a low-pass filter is applied to the signal of FIG. 6, and FIG. It is an enlarged view which shows the sampling state of the principal part of FIG. FIG. 9 is a sectional perspective view of another embodiment, and FIG. 10 is a sectional perspective view of a conventional example. (S) ... Sensor, (1) ... Pedestal, (2) ... Weighing device.

Claims (1)

[Claims] 1. A pedestal (1) is provided adjacent to a weighing machine (2) for weighing an animal, and an upper surface of the weighing machine (2) and an upper surface of the pedestal (1) are the same or substantially the same. A stepping-off detection device for a weighing device, which is provided with a sensor (S) for detecting that a leg of an animal to be weighed contacts the upper surface of the pedestal (1) in the weighing device formed at a height.