JP2002277309A - Moving body conveying and weighing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving body conveying and weighing device capable of conveying continuously a weighing object such as marine products, vegetables or the like without requiring many conveyance means, and measuring the weight thereof at high speed with high accuracy without applying an impact load to the object and without stopping the movement of the object. SOLUTION: This device is equipped with a horizontal belt conveyor 12 for conveying the weighing object 1 horizontally, a plurality of or a single load cell 14 for weighing the support load of the weighing object working on the horizontal belt conveyor, and an operation processing device 16 for executing operation processing of the detection load of the load cell. The horizontal belt conveyor 12 has a vibration isolating shoe 13 in contact with the under surface of the upper-side belt 12a, for suppressing its vertical vibration. The operation processing device 16 is equipped with a low-pass filter 16a for suppressing fluctuation of the support load, and a prescribed fixed weight is subtracted from the total of the support load processed by the low-pass filter, to determine the weight of the weighing object.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object transport and weighing apparatus for weighing an object to be weighed without stopping it while transporting the object.

[0002]

2. Description of the Related Art For example, marine products, vegetables, and the like have different weights, and therefore must be individually weighed before shipment. Therefore, various transport weighing devices for weighing these objects 1 while transporting them have been proposed.

FIG. 10A is composed of a roller conveyor 2, a weighing bar 3, a load cell 4, and the like. The object 1 is horizontally moved by the roller conveyor 2, and the roller 2 is moved along the way.
a, the object 1 is temporarily placed on the weighing bar 3 by lifting the weighing bar 3, and the weight acting on the weighing bar 3 is transferred to the load cell 4.
After the weighing, the weighing bar 3 is lowered and returned onto the roller conveyor 2.

FIG. 10B shows an apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 5-296819 as a "weight measuring apparatus capable of measuring even while moving". This device is a moving object 1
(For example, a transport vehicle), a cradle 5 having a width and a length greater than or equal to the size of the object, four or more support points disposed on the cradle, and the object varying at each of the support points And a measuring device 6 (for example, a load cell) for simultaneously measuring the load of the vehicle, and the arithmetic device 7 performs arithmetic processing on the measured fluctuation values to add only the vertical load components.

[0005]

In the conventional transfer and weighing apparatus shown in FIG. 10A, it is difficult to increase the transfer and weighing speed because it is necessary to replace an object on a bar at the time of weighing. There was a problem. In addition, when the speed is increased, an impulsive sound is generated when the weighing bar collides with the object, an weighing accuracy is reduced due to an impact load applied to the load cell, and an impact during acceleration / deceleration / elevation is applied to the object. Therefore, there has been a problem that the collapse of the load in the container easily occurs.

Further, in the conventional transport weighing device shown in FIG. 10 (B), since it is necessary to move the object 1 on a transport vehicle or the like, a large number of transportation means are required. Suitable but small objects (eg marine products, vegetables, etc.)
Was difficult to apply. Further, in this device, since different vibrations occur depending on the position of the object on the cradle, it is necessary to average the fluctuation components due to the vibrations by an arithmetic processing device and add only the vertical load components, which complicates the arithmetic processing. There was a point.

The present invention has been made to solve the various problems described above. In other words, an object of the present invention is to continuously transport objects to be measured such as marine products and vegetables without requiring a large number of transportation means, without applying an impact load to the objects, and stopping the movement of the objects. It is an object of the present invention to provide a moving object transport and weighing device capable of weighing the weight of the moving object at high speed and with high accuracy.

[0008]

According to the present invention, a horizontal belt conveyor (1) for horizontally transporting an object (1) to be weighed is provided.
2) and a plurality or single load cells (14) for measuring the supporting load of the object to be measured acting on the horizontal belt conveyor
And a processing unit (16) for calculating the detected load of the load cell, wherein the horizontal belt conveyor (12)
Has an anti-vibration shoe (13) that contacts the lower surface of the upper belt (12a) and suppresses vertical vibration thereof, and the arithmetic processing unit (16) includes a low-pass filter (16a) that suppresses fluctuation of the support load. ), Wherein a predetermined constant weight is subtracted from the sum of the supporting loads processed by the low-pass filter to obtain the weight of the object to be weighed.

According to the configuration of the present invention, while the object to be weighed (1) is horizontally conveyed by the horizontal belt conveyor (12), the supporting load of the horizontal belt conveyor is carried out by a plurality or a single load cell (14) in the middle thereof. Is weighed, and a predetermined constant weight is subtracted from the sum of the supporting loads by the arithmetic processing unit (16) to obtain the weight of the object to be weighed. Therefore, the object to be weighed can be continuously conveyed without requiring a large number of transportation means, and the weighing can be performed without applying an impact load to the object and without stopping the movement of the object.

In addition, the vertical vibration of the belt can be suppressed by the anti-vibration shoe (13), and the low-pass filter (16a)
Since the fluctuation of the support load detected by the above is suppressed, the moving object can be weighed by simple arithmetic processing without performing complicated arithmetic processing by using both of them. Furthermore, since the object is conveyed by the belt at a constant speed without stopping, no impact load acts on the object, and the object does not move up and down, so that no impact load acts on the load cell (14). Therefore, even if the speed of the belt conveyor is increased more than before, the weighing accuracy can be maintained, and the weight of the object can be weighed at high speed and with high accuracy.

According to a preferred embodiment of the present invention, the load cell (14) supports a horizontal belt conveyor (12), and the predetermined constant weight is set between the horizontal belt conveyor and the object to be weighed. It is the sum of the weight of the wind body.
With this configuration, a plurality (for example, four) of load cells (1
According to 4), the weight including the horizontal belt conveyor (12) is measured, and the actual weight of the target object can be easily measured by subtracting the sum of the weight of the horizontal belt conveyor and the wind of the target object.

According to another preferred embodiment of the present invention, the load cell (14) includes an anti-vibration shoe (13).
The predetermined constant weight is the sum of the weight of the anti-vibration shoe and the wind of the object to be measured. With this configuration, a plurality of (for example, four) load cells (14) are used to control the horizontal belt conveyor (12).
, The actual weight of the object can be easily measured by subtracting the sum of the weight of the anti-vibration shoe and the wind of the object to be measured. Further, in this configuration, since the main body of the horizontal belt conveyor (12) is not weighed, the constant weight to be subtracted can be reduced, and the measurement accuracy can be improved.

[0013] The low-pass filter (16a) is preferably a low-pass filter for cutting a frequency of about 10 Hz or more. According to the embodiment described later, in the low-pass filter of less than 10 Hz, the fluctuation of the detection supporting load is almost completely eliminated, and there is a possibility that the accuracy may be reduced.
When the frequency is higher than 00 Hz, the detection support load greatly fluctuates, and similarly, there is a possibility that the accuracy is reduced. Therefore, almost 10
A low-pass filter that cuts frequencies equal to or higher than Hz is preferable, and a low-pass filter that cuts frequencies equal to or higher than about 50 Hz is more preferable.

At least the inner surface of the belt (12a) is made of a synthetic resin having a small coefficient of friction, and the contact surface of the vibration isolating shoe (13) with the belt is made of Teflon, synthetic resin or metal having a small coefficient of friction. Is preferred. With this configuration, the sliding resistance between the upper belt (12a) of the horizontal belt conveyor (12) and the anti-vibration shoe (13) can be reduced, the required power can be reduced, and the horizontal force acting on the load cell is reduced. Detection accuracy can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a perspective view showing the state of use of the moving object transport and weighing device of the present invention. As shown in this figure, a moving object transport and weighing device (a weighing device 10) of the present invention is installed between a belt conveyor 21 and a free roller 23, and is a weighing object 1 (for example, marine product) stored in a styrofoam box 8. , Vegetables, etc.) are weighed without stopping while being transported.

Further, in FIG.
No. 2 prints without stopping while transporting the actual weight of the measured object 1 on the side surface of the styrofoam box 8 during transport by the measuring device 10. The alignment unit 21a aligns the styrofoam box 8 in a posture suitable for the weighing and printing. The control panel 11 controls the operation of both the weighing device 10 and the print head 22.

Further, in this example, an ice filling machine 25 (not shown) is used.
Thus, after the crushed ice is packed in the styrofoam box 8 on the inclined belt conveyor 24, the crushed ice is stored in the freezing car 9,
It is to be shipped.

FIG. 2 is a schematic view showing a first embodiment of the moving object transport and weighing device according to the present invention. As shown in this figure,
The moving object transport and weighing device 10 of the present invention includes a horizontal belt conveyor 12, a plurality (for example, four) of load cells 14, and an arithmetic processing device 16.

The horizontal belt conveyor 12 includes an endless belt 12 stretched between horizontally spaced pulleys.
a, and the measuring object 1 is conveyed horizontally by the movement of the belt. At least the inner surface of the belt 12a is made of a synthetic resin having a small friction coefficient. The horizontal belt conveyor 12 further has an anti-vibration shoe 13 that contacts the lower surface of the upper belt 12a and suppresses vertical vibration. The contact surface of the anti-vibration shoe 13 with the belt 12a is made of Teflon or a synthetic resin having a small friction coefficient. The anti-vibration shoes 13 are similarly provided not only below the upper belt 12a but also above the lower belt.

In the first embodiment, the load cell 1
Numeral 4 supports the entire horizontal belt conveyor 12, and measures the support load of the measurement object 1 acting on the horizontal belt conveyor 12.

The arithmetic processing unit 16 includes a low-pass filter 16 for suppressing a variation in the supporting load detected by the load cell 14.
a. This low-pass filter 16a is preferably a low-pass filter that cuts off a frequency of about 10 Hz or more so as to suppress the fluctuation of the detection support load and prevent the detection accuracy from lowering.
A low-pass filter that cuts off frequencies equal to or higher than Hz is preferable. The arithmetic processing unit 16 subtracts a predetermined constant weight from the sum of the supporting loads processed by the low-pass filter 16a to obtain the weight of the object to be weighed. The low-pass filter 16a may be provided for each load cell 14 to suppress the variation in the supporting load detected by each load cell 14, or after summing the outputs of a plurality of load cells 14, the single low-pass filter 16a The variation may be suppressed. In this embodiment, the predetermined constant weight is the sum of the weight of the horizontal belt conveyor and the wind of the object to be measured.

According to the configuration of the present invention described above, while the object to be weighed 1 is conveyed horizontally by the horizontal belt conveyor 12, the support load of the horizontal belt conveyor is measured by the plurality of load cells 14 in the middle thereof, and the arithmetic processing is performed. The predetermined constant weight is subtracted from the sum of the supporting loads by the device 16 to obtain the weight of the object to be weighed. Therefore, the object to be weighed can be continuously conveyed without requiring a large number of transportation means, and the weighing can be performed without applying an impact load to the object and without stopping the movement of the object.

Further, since the vertical vibration of the belt can be suppressed by the anti-vibration shoe 13 and the fluctuation of the support load detected by the low-pass filter 16a is suppressed, the both can be used together without performing complicated arithmetic processing. Moving objects can be measured by simple arithmetic processing. Further, the object is conveyed by the belt at a constant speed without stopping, so that no impact load acts on the object, and since the object is not moved up and down, no impact load acts on the load cell 14. Therefore, even if the speed of the belt conveyor is increased more than before, the weighing accuracy can be maintained, and the weight of the object can be weighed at high speed and with high accuracy.

According to the first embodiment shown in FIG. 2, the weight including the horizontal belt conveyor 12 is weighed by a plurality (for example, four) of load cells 14, and the weight sum of the horizontal belt conveyor and the wind body of the object to be weighed is obtained. , The actual weight of the object can be easily measured.

FIG. 3 is a schematic diagram showing a second embodiment of the moving object transport and weighing device of the present invention. In this example, the load cell 14 measures the supporting load acting on the anti-vibration shoe 13, and the predetermined constant weight subtracted by the arithmetic processing unit 16 is the weight of the anti-vibration shoe and the weight of the wind body of the object to be measured. It is sum. Other configurations are the same as those of the first embodiment in FIG.

According to this configuration, similarly to the first embodiment, the object to be weighed can be continuously transported without the need for a large number of transportation means, and no impact load is applied to the object and the movement of the object can be performed. Without stopping, the weight can be weighed at high speed and with high accuracy. In this embodiment, since the main body of the horizontal belt conveyor 12 is not weighed, the constant weight to be subtracted can be reduced, and the measurement accuracy can be further improved.

[0028]

EXAMPLES Examples of the present invention will be described below more specifically. FIG. 4 is a plan view of an embodiment of the present invention, and FIG.
6 is a cross-sectional view taken along line AA, and FIG. 6 is a cross-sectional view taken along line BB in FIG. 4 to 6 correspond to the first embodiment shown in FIG.

As shown in FIGS. 4 to 6, the horizontal belt conveyor 12 includes two endless belts 12a, a driving pulley 12b, a driven pulley 12c, a driving motor 12d, and a support base 12e. Two endless belts 12
a is installed at an interval capable of stably transporting the styrofoam box 8 accommodating the weighing target 1 (for example, marine products, vegetables, etc.), is rotated endlessly in synchronization with the drive motor 12d, and is placed on the upper surface thereof. The measured object 1 is transported horizontally.

In this example, two endless belts 12a, a driving pulley 12b, a driven pulley 12c, and a driving motor 12d are mounted on a support base 12e. Further, the anti-vibration shoe 13 is also mounted on the support base 12e by the support fitting 13a so as not to interfere with the endless belt 12a and the like.

The four load cells 14 are mounted on the support base 12.
e, supporting the four corners, and all the weight on the support base 12e is supported by the load cell 14. Note that the arrangement of the load cells 14 is not limited to this example, and the support base 12
e may be supported at the center of the four sides, or may be supported by three or five or more load cells 14.

7 to 9 show specific examples of the support load detected by using the above-described apparatus. FIG. 7 shows an example of a conventional change in the support load, and FIG. 8 shows the effect of the shoe and the filter in the present invention. FIG. 9 and FIG. 9 are diagrams showing the influence of the frequency cut by the low-pass filter in the present invention. In each figure, a horizontal thin line indicates an accurate detection level, and a subscript indicates a detected load. Further, in this example, after summing the outputs of the four load cells 14, the fluctuation is suppressed by a single low-pass filter 16a.

FIG. 7 shows that the anti-vibration shoe 13 of the present invention is used.
When the low-pass filter 16a and the low-pass filter 16a are not used, the detected support load fluctuates greatly, and the arithmetic processing of averaging the fluctuation component due to vibration and adding only the vertical load component becomes complicated, which makes it difficult to perform high-precision weighing. Understand.

From the comparison of FIGS. 8A and 8B, the use of the anti-vibration shoe 13 according to the present invention can suppress the fluctuation of the supporting load to some extent, but it is still not enough. By using together, fluctuation of the supporting load can be sufficiently suppressed and accuracy can be maintained,
It can be seen that the moving object can be measured by simple arithmetic processing without performing complicated arithmetic processing.

Further, from the comparison of FIGS. 9A to 9D,
With a low-pass filter of less than 10 Hz, the fluctuation of the detected support load is almost completely eliminated, and there is a possibility that the accuracy will be reduced. is there. Therefore, a low-pass filter that cuts frequencies of about 10 Hz or higher is preferable, and a low-pass filter that cuts frequencies of about 50 Hz or higher is more preferable.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0037]

As described above, the moving object transport and weighing device of the present invention can continuously transport an object to be weighed such as marine products and vegetables without requiring a large number of transportation means, and can apply an impact load to the object. And the weight of the object can be measured at high speed and with high accuracy without stopping the movement of the object.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a moving object transport and weighing device of the present invention.

FIG. 2 is a schematic diagram showing a first embodiment of the moving object transport and weighing device of the present invention.

FIG. 3 is a schematic view showing a second embodiment of the moving object transport and weighing device of the present invention.

FIG. 4 is a plan view of an embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG.

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a diagram showing a conventional example of a change in a supporting load.

FIG. 8 is a diagram showing effects of a shoe and a filter in the present invention.

FIG. 9 is a diagram illustrating an influence of a frequency cut by a low-pass filter according to the present invention.

FIG. 10 is a schematic diagram of a conventional transport weighing device.

[Explanation of symbols]

1 object (object), 2 roller conveyor, 2a roller, 3 weighing bar, 4 load cell, 5 cradle, 6
Measuring device, 7 Calculation device, 8 Styrofoam box, 9
Refrigeration car, 10 Moving object transport and weighing device, 11 Control panel, 1
2 horizontal belt conveyor, 12a belt, 13 anti-vibration shoe, 14 load cell, 16 arithmetic processing unit, 16
a low-pass filter, 21 belt conveyor, 21a
Alignment section, 22 print head, 23 free rollers,
24 inclined belt conveyor, 25 ice filling machine

Claims (5)

[Claims] 1. A horizontal belt conveyor (12) for horizontally transporting an object to be weighed (1), a plurality or a single load cell (14) for weighing a supporting load of the object to be weighed acting on the horizontal belt conveyor, An arithmetic processing unit (16) for arithmetically processing the load detected by the load cell; wherein the horizontal belt conveyor (12) is in contact with the lower surface of the upper belt (12a) and suppresses vertical vibration thereof (13). The arithmetic processing unit (16) includes a low-pass filter (16a) that suppresses a variation in the support load, and subtracts a predetermined constant weight from the sum of the support loads processed by the low-pass filter to measure the weight. A moving object transport and weighing device, wherein the weight is the weight of an object. 2. The load cell (14) supports a horizontal belt conveyor (12), and the predetermined constant weight is the sum of the weight of the horizontal belt conveyor and the air body of the object to be measured. The moving object transport and weighing device according to claim 1, wherein: 3. The load cell (14) is configured to measure a supporting load acting on an anti-vibration shoe (13), and the predetermined constant weight is a weight of the anti-vibration shoe and the weight of a wind object to be measured. The moving object transfer and weighing device according to claim 1, wherein the sum is a sum. 4. The moving object transport and weighing device according to claim 1, wherein the low-pass filter (16a) is a low-pass filter that cuts off a frequency of about 10 Hz or more. 5. At least the inner surface of the belt (12a) is made of synthetic resin having a small coefficient of friction, and the contact surface of the anti-vibration shoe (13) with the belt is made of Teflon (registered trademark) or synthetic resin having a small coefficient of friction. Or made of metal,
The moving object transport and weighing device according to claim 1, wherein: