JP3644538B2 - Moving object transfer weighing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a moving object conveying and weighing apparatus that measures a weight of an object to be measured without stopping while conveying the object.
[0002]
[Prior art]
For example, since marine products, vegetables, and the like have different weights, it is necessary to individually weigh them before shipping. For this reason, various transport and weighing devices that measure these objects 1 while being transported have been proposed.
[0003]
FIG. 10A is composed of a roller conveyor 2, a weighing bar 3, a load cell 4, and the like. The object 1 is moved horizontally by the roller conveyor 2, and the measuring bar 3 is raised from between the rollers 2a in the middle. Then, the object 1 is temporarily replaced, the weight acting on the weighing bar 3 is measured by the load cell 4, and the weighing bar 3 is lowered after the weighing and returned to the roller conveyor 2.
[0004]
FIG. 10B shows an apparatus disclosed in Japanese Patent Laid-Open No. 5-296619 as “a weight weighing apparatus that can measure even during movement”. This apparatus has a cradle 5 having a width and a length that is greater than or equal to the size of the object, and four or more support points disposed on the cradle for the moving object 1 (for example, a transport vehicle) A measurement device 6 (for example, a load cell) that simultaneously measures the load of the object that fluctuates at each support point is provided, and a calculation variation value is calculated by the calculation device 7 to add only the vertical load components.
[0005]
[Problems to be solved by the invention]
The conventional transport and weighing apparatus shown in FIG. 10A has a problem that it is difficult to increase the transport / metering speed because it is necessary to place the object on the bar during weighing. In addition, if the speed is increased, an impact sound is generated when the weighing bar collides with the object, the load accuracy is reduced due to the impact load acting on the load cell, and the object is subjected to an impact during acceleration / deceleration / elevation. For this reason, there is a problem that the container collapses easily.
[0006]
Further, in the conventional transport and weighing device shown in FIG. 10 (B), since it is necessary to place the object 1 on a transport vehicle or the like and move it, a large number of transport means are required, which is suitable for a large object. It was difficult to apply to small objects (for example, seafood, vegetables, etc.). In addition, in this device, vibrations that vary depending on the position of the object on the cradle cause fluctuation components due to vibration to be averaged by the arithmetic processing device, and only the vertical load component needs to be summed, which complicates the arithmetic processing. There was a point.
[0007]
The present invention has been made to solve the various problems described above. That is, an object of the present invention is to continuously transport a measurement object such as a fishery product or vegetable without requiring a large number of transportation means, and to stop the movement of the object without giving an impact load to the object. It is an object of the present invention to provide a moving object transport and weighing device capable of weighing the weight at high speed and with high accuracy.
[0008]
[Means for Solving the Problems]
According to the present invention, there is provided a moving object transport and weighing device that measures the weight of a weighing object for each container to be conveyed without stopping while conveying the weighing object (1) contained in the container. A horizontal belt conveyor (12) for conveying an object horizontally, a plurality or a single load cell (14) for measuring a supporting load of an object to be measured acting on the horizontal belt conveyor, and an operation for calculating the detected load of the load cell The horizontal belt conveyor (12) has an anti-vibration shoe (13) that comes into contact with the lower surface of the upper belt (12a) and suppresses the vertical vibration thereof, and the arithmetic processing unit ( 16) includes a low-pass filter (16a) that suppresses fluctuations in the support load, and subtracts a predetermined constant weight from the sum of the support loads processed by the low-pass filter to reduce the weight of the object to be measured. And then, the load cell (14) is adapted to weigh the support loads acting on the vibration damping shoe (13), the predetermined constant weight, the weight sum of the tare of the vibration-proof shoe with weighing object There is provided a moving object conveying and weighing device characterized in that.
[0009]
According to the configuration of the present invention, while the weighing object (1) is transported horizontally by the horizontal belt conveyor (12), the supporting load of the horizontal belt conveyor is weighed by a plurality or a single load cell (14). Then, a predetermined constant weight can be subtracted from the sum of the support loads by the arithmetic processing unit (16) to obtain the weight of the object to be measured. Accordingly, the weighing object can be continuously conveyed without the need for a large number of conveying means, and weighing can be performed without applying an impact load to the object and without stopping the movement of the object.
[0010]
Moreover, since the 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 combined use of both of them eliminates the need for complicated calculation processing. It is possible to weigh moving objects with simple calculation processing. Furthermore, since the object is transported by the belt without stopping at a constant speed, 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.
[0011]
[0012]
In addition, it is easy to measure the weight without the main body of the horizontal belt conveyor (12) by subtracting the sum of the weight of the anti-vibration shoe and the wind object of the object to be weighed by a plurality of (for example, four) load cells (14). The actual weight of the object can be measured. Moreover, in this structure, since the main-body part of a horizontal belt conveyor (12) is not measured, the fixed weight to subtract can be made small and a measurement precision can be improved.
[0013]
The low-pass filter (16a) is preferably a low-pass filter that cuts a frequency of approximately 10 Hz or more. From the examples described later, in the low-pass filter of less than 10 Hz, the fluctuation in the detection support load is almost completely eliminated, and there is a risk of the accuracy being lowered. On the contrary, in the case of 100 Hz or more, the fluctuation in the detection support load is large. There is a risk that accuracy will be reduced. Therefore, a low-pass filter that cuts a frequency of about 10 Hz or more is preferable, and a low-pass filter that cuts a frequency of about 50 Hz or more is more preferable.
[0014]
At least the inner surface of the belt (12a) is made of a synthetic resin having a small friction coefficient, and the contact surface of the anti-vibration shoe (13) with the belt is made of polytetrafluoroethylene , a synthetic resin or a metal having a small friction coefficient. It is preferable. 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 can be reduced. Detection accuracy can be increased.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
[0016]
FIG. 1 is a perspective view showing a usage state of the moving object transport and weighing device of the present invention. As shown in this figure, the moving object conveyance and weighing device (metering 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, aquatic product) housed in a foamed polystyrene box 8. , Vegetables, etc.) are weighed without stopping while transporting them.
[0017]
Further, in this figure, the print head 22 prints without stopping while transporting the actual weight of the object 1 weighed on the side surface of the foamed polystyrene box 8 during transport by the weighing device 10. In addition, the alignment part 21a aligns the foamed polystyrene box 8 in the attitude | position suitable for this measurement and printing. Further, the control panel 11 controls the operation of both the weighing device 10 and the print head 22.
[0018]
Further, in this example, the ice crusher 25 (not shown) packs the crushed ice in the foamed polystyrene box 8 on the inclined belt conveyor 24, and then accommodates the ice in the freezer 9 for shipment.
[0019]
FIG. 2 is a schematic diagram illustrating a reference example of the moving object transport and weighing device . As illustrated in FIG. 1 , the moving object transport and weighing device 10 includes a horizontal belt conveyor 12, a plurality of (for example, four) load cells 14, and an arithmetic processing device 16.
[0020]
The horizontal belt conveyor 12 has an endless belt 12a that is stretched between horizontally spaced pulleys, and the weighing 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 includes an anti-vibration shoe 13 that is in contact with the lower surface of the upper belt 12a and suppresses the vertical vibration thereof. The contact surface of the anti-vibration shoe 13 with the belt 12a is made of polytetrafluoroethylene or synthetic resin having a small friction coefficient. The anti-vibration shoe 13 is similarly provided on the upper side of the lower belt in addition to the lower side of the upper belt 12a.
[0021]
In this reference example , the load cell 14 is configured to support the entire horizontal belt conveyor 12 and measures the support load of the weighing object 1 acting on the horizontal belt conveyor 12.
[0022]
The arithmetic processing unit 16 includes a low-pass filter 16 a that suppresses fluctuations in the support load detected by the load cell 14. The low-pass filter 16a is preferably a low-pass filter that cuts a frequency of approximately 10 Hz or more, more preferably a frequency of approximately 50 Hz or more so as to suppress fluctuations in the detection support load and prevent a decrease in detection accuracy. A low-pass filter for cutting is preferable. By this arithmetic processing unit 16, a predetermined constant weight is subtracted from the sum of the support loads processed by the low-pass filter 16a to obtain the weight of the object to be measured. This low-pass filter 16a may be provided for each load cell 14 to suppress the variation of the support load detected by each load cell 14, or after adding the outputs of a plurality of load cells 14, the single low-pass filter 16a You may make it suppress a fluctuation | variation. In this reference example , the predetermined constant weight is the sum of the weights of the horizontal belt conveyor and the tare of the weighing object.
[0023]
According to the configuration of the reference example described above, while the weighing object 1 is transported horizontally by the horizontal belt conveyor 12, the supporting load of the horizontal belt conveyor is measured by the plurality of load cells 14 in the middle, and the arithmetic processing device 16 A predetermined constant weight can be subtracted from the sum of the supporting loads to obtain the weight of the weighing object. Accordingly, the weighing object can be continuously conveyed without the need for a large number of conveying means, and weighing can be performed without applying an impact load to the object and without stopping the movement of the object.
[0024]
Further, since the 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 can be suppressed, by using both of them, simple calculation can be performed without performing complicated calculation processing. We can weigh moving objects by processing. Further, since the object is transported by the belt without stopping at a constant speed, no impact load acts on the object, and the object does not move up and down, so 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.
[0025]
In addition, according to the reference example of FIG. 2, the weight including the horizontal belt conveyor 12 is measured by a plurality of (for example, four) load cells 14, and the sum of the weights of the horizontal belt conveyor and the tare of the weighing object is subtracted. The actual weight of the object can be easily measured.
[0026]
FIG. 3 is a schematic diagram showing an embodiment of the moving object conveyance and weighing device of the present invention. In this example, the load cell 14 measures the supporting load acting on the vibration isolating shoe 13, and the predetermined constant weight subtracted by the arithmetic processing unit 16 is the weight of the vibration isolating shoe and the tare of the measurement object. It is sum. Other configurations are the same as those of the reference example of FIG.
[0027]
Even with this configuration, similarly to the reference example , the weighing object can be continuously conveyed without requiring a large number of transportation means, without applying an impact load to the object, and without stopping the movement of the object. The weight can be measured at high speed and with high accuracy. Moreover, in this embodiment, since the main-body part of the horizontal belt conveyor 12 is not measured, the fixed weight to subtract can be made small and a measurement precision can be raised more.
[0028]
Hereinafter, a reference example will be described more specifically. 4 is a plan view of a reference example , FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a cross-sectional view taken along line BB in FIG. The reference examples in FIGS. 4 to 6 correspond to the reference example shown in FIG.
[0029]
4 to 6, the horizontal belt conveyor 12 includes two endless belts 12a, a drive pulley 12b, a driven pulley 12c, a drive motor 12d, and a support base 12e. The two endless belts 12a are installed at intervals at which the foamed polystyrene box 8 containing the measurement object 1 (for example, seafood, vegetables, etc.) can be stably conveyed, and rotate endlessly in synchronization with the drive motor 12d. The weighing object 1 placed on the upper surface thereof is transported horizontally.
[0030]
In this example, the two endless belts 12a, the drive pulley 12b, the driven pulley 12c, and the drive motor 12d are attached to the 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.
[0031]
The four load cells 14 support the four corners of the support base 12e, and all the weights on the support base 12e are supported by the load cells 14. The arrangement of the load cell 14 is not limited to this example, and the load cell 14 may be supported at the center of the four sides of the support base 12e, or may be supported by three or five or more load cells 14.
[0032]
7 to 9 are specific examples of the support load detected using the above-described apparatus, FIG. 7 is a variation example of the conventional support load, and FIG. 8 is a diagram showing the effect of the shoe and the filter in the present invention. 9 is a diagram 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 detection load. In this example, after the outputs of the four load cells 14 are added together, the fluctuation is suppressed by a single low-pass filter 16a.
[0033]
From FIG. 7, when the anti-vibration shoe 13 and the low-pass filter 16a according to the present invention are not used, the detected support load fluctuates greatly, and the arithmetic processing for averaging only the fluctuating components due to vibration and adding the vertical load components becomes complicated. It turns out that high-precision weighing is difficult.
[0034]
Further, from the comparison of FIGS. 8A and 8B, the use of the anti-vibration shoe 13 in the present invention can suppress the variation of the support load to some extent, but it is not sufficient yet, and the low-pass filter 16a is additionally used. Thus, it can be understood that the variation of the support load can be sufficiently suppressed and the accuracy can be maintained, so that the moving object can be measured by a simple calculation process without performing a complicated calculation process.
[0035]
Furthermore, from the comparison of (A) to (D) in FIG. 9, the low-pass filter of less than 10 Hz almost completely eliminates fluctuations in the detection support load, which may cause a decrease in accuracy. The variation of the detection support load is large, and there is a risk that the accuracy may be similarly lowered. Therefore, a low-pass filter that cuts a frequency of about 10 Hz or more is preferable, and a low-pass filter that cuts a frequency of about 50 Hz or more is more preferable.
[0036]
In addition, this invention is not limited to the Example mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.
[0037]
【The invention's effect】
As described above, the moving object transportation and weighing device of the present invention can continuously convey a measurement object such as fishery products and vegetables without requiring a large number of transportation means, without giving an impact load to the object. In addition, it has an excellent effect that the weight can be measured with high speed and 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 reference example of a moving object transport and weighing device.
FIG. 3 is a schematic diagram showing an embodiment of the moving object conveyance and weighing device of the present invention.
FIG. 4 is a plan view of a reference example .
5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
FIG. 7 is a diagram showing a variation example of a conventional support load.
FIG. 8 is a diagram showing the effect of a shoe and a filter in the present invention.
FIG. 9 is a diagram showing the influence of the frequency cut by the low-pass filter in the present invention.
FIG. 10 is a schematic diagram of a conventional transport and weighing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Object (object), 2 roller conveyor, 2a roller, 3 measuring bar, 4 load cell, 5 receiving stand, 6 measuring device, 7 calculating device, 8 foamed polystyrene box, 9 freezer, 10 moving object conveyance measuring device, 11 Control panel, 12 horizontal belt conveyor, 12a belt, 13 anti-vibration shoe, 14 load cell, 16 arithmetic processing unit, 16a low-pass filter, 21 belt conveyor, 21a alignment unit, 22 print head, 23 free roller, 24 inclined belt conveyor, 25 Ice filling machine

Claims (3)

A moving object transport and weighing device that measures the weight of the weighing object for each container to be conveyed without stopping while conveying the weighing object (1) contained in the container,
A horizontal belt conveyor (12) that transports the object to be measured horizontally, a plurality or a single load cell (14) that measures the supporting load of the object to be measured acting on the horizontal belt conveyor, and a calculation processing of the detected load of the load cell An arithmetic processing unit (16) for performing
The horizontal belt conveyor (12) has an anti-vibration shoe (13) that touches the lower surface of the upper belt (12a) and suppresses vertical vibrations thereof,
The arithmetic processing unit (16) includes a low-pass filter (16a) that suppresses fluctuations in the support load, and subtracts a predetermined constant weight from the sum of the support loads processed by the low-pass filter to obtain the weight of the measurement object. And
The load cell (14) is adapted to measure a support load acting on the vibration isolating shoe (13), and the predetermined constant weight is a sum of weights of the vibration isolating shoe and the tare of the measurement object.
A moving object conveyance weighing device characterized by the above.   The moving object transport and weighing device according to claim 1, wherein the low-pass filter (16a) is a low-pass filter that cuts a frequency of approximately 10 Hz or more. At least the inner surface of the belt (12a) is made of a synthetic resin having a small friction coefficient, and the contact surface of the anti-vibration shoe (13) with the belt is made of polytetrafluoroethylene , a synthetic resin or a metal having a small friction coefficient. The moving object conveying and weighing apparatus according to claim 1, wherein:

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