JP7236726B2 - Portable weighing device - Google Patents

Description

The present invention relates to a portable weighing device.

A fishing boat that operates on the sea weighs the caught fish on the same day. For measuring the weight of fish and shellfish on the sea, it is conceivable to use an ordinary scale such as a platform scale for land use. However, on board a ship that is constantly in motion, the value on the scale is not fixed, making it difficult to read.

Therefore, a weighing device for measuring the weight of a ship regardless of vertical movement and rocking of the hull has been disclosed (for example, Patent Document 1). In this weighing device, a control unit, a display means, and a printer are arranged on the cabin side, and an amplifier box is arranged. A control unit corrects the output of the measuring load cell based on the output of the reference load cell to obtain the weighing value.

Further, a weight measurement method for measuring weight in an environment where shaking occurs, such as on a ship, has been disclosed (for example, Patent Document 2). In this weight measurement method, each load cell simultaneously measures the weight of the object to be measured and the dummy weight, compares the measured weight of the dummy weight with the true weight, and finds the difference between the measured weight of the dummy weight and the true weight. The measured weight of the measurement object simultaneously measured within the predetermined range is adopted as the normal measured value.

JP-A-2000-241236 JP 2008-070282 A

However, the above-mentioned prior arts are all fixed to and integrated with the ship, lacking freedom of movement and installation location on the ship, and lack versatility. Also, if a prior art scale is to be installed on board a ship, part of the ship must be rebuilt, and the scale cannot be easily installed.

SUMMARY OF THE INVENTION The present invention provides a portable weighing device that is not fixed to a ship, can be transported, can be easily used on the ship, and can reduce swinging of the hull to enable highly accurate weighing.

A portable weighing device according to one aspect of the present invention includes a first weight corresponding output unit that outputs a first output in accordance with the weight of a reference weight that is a reference weight, and a second output in accordance with the weight of an object to be weighed. a bottomed box-shaped member having an open upper portion and having the first weight corresponding output portion and the second weight corresponding output portion fixed side by side to the inner bottom surface thereof; A lid-shaped member that covers the top opening of the bottomed box-shaped member and on which the object to be weighed is placed is connected to the second weight corresponding output section and the lid-shaped member, and the second a spacer for supporting the lid-shaped member so that the weight corresponding output section can perform the second output according to the weight of the object to be weighed; a control unit for correcting the second output from the second output unit for weight based on the first output from the first output unit for weight; and the object to be weighed based on the corrected second output. and a display unit for displaying the weight value of the weight value of the weighing object, and the control unit is registered in advance with the first output and the second output in a state where the object to be weighed is placed on the lid-shaped member. The second output is corrected based on the first output when one gravitational acceleration is applied and a unique value due to individual differences of the portable weighing device.

The control unit calculates an accuracy correction coefficient that varies depending on the weight of the object to be weighed based on a unique value due to individual differences of the portable weighing device for each measurement, and the object to be weighed is attached to the lid-like member. The second output is determined based on the first output and the second output in the placed state, the first output when a pre-registered one gravitational acceleration is applied, and the accuracy correction coefficient. It is characterized by correcting.

According to the portable weighing device according to the present invention, it is not fixed to the ship, it can be transported, it can be easily used on the ship, and it can be weighed with high accuracy by reducing the rocking motion of the ship.

It is an appearance perspective view showing an example of the appearance of the weighing device in this embodiment. It is a block diagram showing an example of the hardware constitutions of the weighing device in this embodiment. 4 is a flow chart showing weighing processing according to the present embodiment.

FIG. 1 is an external perspective view showing an example of the external appearance of the weighing device according to this embodiment. The weighing device 1 of FIG. 1 is of a transportable type, and includes an indicator section 2, an indicator support section 5, and a weighing platform 6, as an example.

The indicator unit 2 inputs setting information of the weighing device 1 and displays weighing results. The indicator section 2 is provided with an input section 3 and a display section 4 . The input unit 3 is an input interface for performing various settings of the weighing device 1 . The display unit 4 may be, for example, a 7-segment display, a liquid crystal display, an organic EL (Electro Luminescence) display, or the like that digitally displays the weighing result. Note that the indicator unit 2 may be configured by a touch panel.

The weighing table 6 is a weighing device body that performs weighing. The weighing platform 6 is supported by four weighing platform supports 7 provided at the four corners of its bottom surface. The indicator support section 5 supports the indicator section 2 and connects the indicator section 2 and the weighing platform 6 .

FIG. 2 is a block diagram showing an example of the hardware configuration of the weighing device according to this embodiment. The weighing platform 6 includes a bottom-side housing 21 , a platform 22 , a reference load cell 23 , a reference weight 24 , a weighing load cell 25 and spacers 26 .

The bottom-side housing 21 is a box-shaped member with an open top, and a reference load cell 23 and a weighing load cell 25 are installed on the inner bottom surface. The platform 22 is a cover that covers the opening of the bottom-side housing 21, and an object to be weighed is placed thereon.

The reference load cell 23 is a device that measures a reference load (reference weight 24) as a change in electrical resistance with a strain gauge and converts it into weight. The reference weight 24 is a reference weight. The heavier the reference weight 24, the higher the correction resolution when weighing. It is judged and decided comprehensively. Although it depends on the specifications, the reference weight 24 may be a weight of 4 kg as an example, considering the balance between the portable weighing device and the resolution. In order to effectively utilize the space in the bottom side housing 21 , the end portion of the reference weight 24 may have a hanging structure so as to be held at a position lower than the upper surface of the reference load cell 23 . As a result, the reference weight 24 can be efficiently arranged in the limited space inside the bottom side housing 21, and the reference weight 24 can be arranged stably against shaking.

Note that the reference weight 24 is supported only by the reference load cell 23, and a gap is formed between the reference weight 24 and the platform 22, and the reference load cell 23 and the reference weight 24 are supported by the load to be weighed. It is structured so as not to be affected by

The weighing load cell 25 is a device that measures the load of the object to be weighed placed on the platform 22 supported via the spacer 26 as a change in electrical resistance with a strain gauge and converts it into weight. The spacer 26 is a spacer that fills the gap between the weighing load cell 25 and the platform 22 . The spacer 26 supports the platform 22 and transmits the load to the weighing load cell 25 .

It is preferable that the reference load cell 23 and the weighing load cell 25 are closer, preferably adjacent to each other. As a result, the effect of gravity applied during shaking between the reference load cell 23 and the weighing load cell 25 can be made more uniform under the same conditions and environments, so that the effect of correction can be improved.

Ideally, the reference load cell 23 and the weighing load cell 25 should have the same conditions except for the load. Therefore, it is preferable that the reference load cell 23 and the weighing load cell 25 are load cells of the same kind, the same model, and the same specifications.

Indicator section 2 includes input section 3 , display section 4 , control section 11 , memory 12 and A/D converter 13 . The control unit 11 is a processor that controls the weighing device 1 as a whole, such as a central processing unit (CPU). The control unit 11 executes the program according to the present embodiment, for example, performs processing based on the contents input by the input unit 3, and calculates weighing results based on signals from the reference load cell 23 and weighing load cell 25. is displayed on the display unit 4, or the like.

The memory 12 is, for example, a storage unit that stores programs according to the present embodiment, stores the contents and predetermined values input by the input unit 3, and temporarily holds data. The memory 12 may be a semiconductor memory such as a flash memory that is resistant to vibration and shaking.

The A/D converter 13 converts the analog signal (analog value) output from the reference load cell 23 and the weighing load cell 25 into a digital signal (digital value), and converts the converted digital signal (digital value) into an A/D value. , and is output to the control unit 11 . Note that the A/D converter 13 may be inside the weighing platform 6 .

Hereinafter, a signal obtained by converting an analog signal output from the reference load cell 23 into a digital signal (A/D value) will be referred to as a "reference A/D value". A signal obtained by converting an analog signal output from the weighing load cell 25 into a digital signal is called a "weighing A/D value".

FIG. 3 is a flow chart showing weighing processing in this embodiment. This weighing process is executed by the control unit 11 each time weighing is performed. The control unit 11 preloads programs and values necessary for weighing processing from the memory 12 .

First, when the object to be measured is placed on the platform 22, the control unit 11 waits until 30 ms elapse for filtering (NO in S1). Here, the waiting time of 30 ms is an example and is not limited to this.

After 30 milliseconds have elapsed (YES in S1), the control unit 11 outputs the weighing A/D value output from the weighing load cell 25 and converted by the A/D converter 13, and the A/D value output from the reference load cell 23. A reference A/D value converted by the converter 13 is obtained (S2, S3).

The control unit 11 calculates the optimum value of the accuracy correction coefficient α by Equation (1) (S4). Since the accuracy correction coefficient α is a value that varies depending on the weight of the object to be weighed, the optimum value is calculated for each weighing process.
Accuracy correction coefficient α=P1+{(measurement A/D value-P2)/(reference A/D value-P2)}×P3 (1)
Here, P1, P2, and P3 are fixed values of the weighing device 1 that differ depending on the characteristics of the reference load cell 23 and the weighing load cell 25, and the like. As described above, the reference load cell 23 and the weighing load cell 25 are load cells of the same kind, the same type, and the same specifications. It is necessary to adjust P1, P2 and P3 according to the device.

Next, the control unit 11 calculates a weighing A/D value (corrected weighing A/D value) obtained by correcting the weighing A/D value based on the reference A/D value (S5). The control unit 11 calculates the correction metric A/D value by the formula (2).
Corrected weighing A/D value = weighing A/D value × (reference A/D value at 1G - α) / (reference A/D value - α) (2)
Here, the reference A/D value at 1 G is the reference A/D value obtained by converting the analog signal output to the reference load cell 23 into a digital signal when the gravitational acceleration is 1 G (=9.80665 m/ ^s2) . are stored in advance in the memory 12 and read out by the control unit 11 .

The control unit 11 converts the calculated corrected weight A/D value into a weight value (kg unit) (S6). The control unit 11 outputs the converted weighing value (in units of kg) to the display unit 4 and displays it on the display unit 4 (S7).

By arranging the reference load cell 23 and the weighing load cell 25 in substantially the same environment by the weighing processing of FIG. Since it extends to the load cell 25 , the weight of the object to be weighed on the weighing load cell 25 can be measured relative to the reference load cell 23 .

At this time, the accuracy correction coefficient α, which varies depending on the weight of the object to be weighed and the individual difference of the load cell, can be adjusted for each weighing.

Note that the configuration of the weighing device 1 in FIG. 1 is an example, and the indicator unit 2 may be directly provided on the weighing platform 6, for example. In addition, although the indicator part 2 is provided at the end of the indicator support part 5 in FIG. Further, the indicator support portion 5 is not limited to a standard housing shape, and may be formed of a flexible tube-shaped material. Alternatively, for example, the indicator support section 5 may be omitted and the indicator section 2 and the weighing platform 6 may be connected using wireless communication (for example, Bluetooth (registered trademark)).

According to this embodiment, the portable weighing device (for example, the weighing device 1)
a first weight corresponding output unit (for example, a reference load cell 23) that performs a first output according to the weight of a reference weight that is a reference weight;
a second weight corresponding output unit (for example, weighing load cell 25) that performs a second output according to the weight of the object to be weighed;
a bottomed box-shaped member (e.g., bottom-side housing 21) having an open top and having the first weight-corresponding output section and the second weight-corresponding output section fixed in parallel on the inner bottom surface;
a lid-shaped member (for example, a platform 22) that covers the top opening of the bottomed box-shaped member and on which the object to be weighed is placed;
A spacer that connects the second weight-corresponding output section and the lid-shaped member and supports the lid-shaped member so that the second weight-corresponding output section can perform the second output according to the weight of the object to be weighed. (eg, spacer 26); and
Control for correcting the second output from the second weight corresponding output section based on the first output from the first weight corresponding output section in a state where the object to be weighed is placed on the lid-like member a unit (for example, the control unit 11);
a display unit (for example, display unit 4) that displays the weight value of the object to be weighed based on the corrected second output;
Prepare.

By constructing in this way, it is not fixed to the vessel, can be transported, can be easily used on the vessel, and can be weighed with high accuracy by reducing the rocking of the hull. In other words, regardless of the structure of the ship or whether the ship is rebuilt, it is possible to reduce the rocking of the hull and easily and accurately weigh the object to be weighed on board.

The control unit outputs the first output and the second output when the object to be weighed is placed on the lid-like member, and the first output when one pre-registered gravitational acceleration is applied. The second output is corrected based on.

By configuring in this way, it is possible to reduce the influence of shaking on the housing and to measure with high accuracy.

The present aspect has been described above based on the embodiments and modifications, but the above-described embodiments are intended to facilitate understanding of the present aspect, and do not limit the present aspect. This aspect may be modified and modified without departing from the spirit and scope of the claims, and this aspect includes equivalents thereof. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

1 weighing device 2 indicator unit 3 input unit 4 display unit 5 indicator support unit 6 weighing base 7 weighing base support unit 11 control unit 12 memory 13 A/D converter 21 bottom side housing 22 platform 23 reference load cell 24 reference Weight 25 Weighing load cell 26 Spacer

Claims (2)

A portable weighing device,
a first weight corresponding output unit that performs a first output according to the weight of the reference weight, which is a reference weight;
a second weight corresponding output unit that performs a second output according to the weight of the object to be weighed;
a bottomed box-shaped member having an open top and having the first weight corresponding output section and the second weight corresponding output section fixed side by side to the inner bottom surface;
a lid-shaped member that covers the top opening of the bottomed box-shaped member and on which the object to be weighed is placed;
A spacer that connects the second weight-corresponding output section and the lid-shaped member and supports the lid-shaped member so that the second weight-corresponding output section can perform the second output according to the weight of the object to be weighed. and,
Control for correcting the second output from the second weight-corresponding output section based on the first output from the first weight-corresponding output section in a state where the object to be weighed is placed on the lid-like member Department and
a display unit that displays the weight value of the object to be weighed based on the corrected second output;
with
The control unit outputs the first output and the second output when the object to be weighed is placed on the lid-like member, and the first output when one pre-registered gravitational acceleration is applied. , a portable weighing device, wherein the second output is corrected based on a unique value due to individual differences of the portable weighing device. The control unit calculates an accuracy correction coefficient that varies depending on the weight of the object to be weighed based on a unique value due to individual differences of the portable weighing device for each measurement, and the object to be weighed is attached to the lid-like member. The second output is determined based on the first output and the second output in the placed state, the first output when a pre-registered one gravitational acceleration is applied, and the accuracy correction coefficient. The portable weighing device according to claim 1, wherein the correction is performed.

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