JP2013088393A - Weight difference measuring apparatus - Google Patents

Weight difference measuring apparatus Download PDF

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Publication number
JP2013088393A
JP2013088393A JP2011231775A JP2011231775A JP2013088393A JP 2013088393 A JP2013088393 A JP 2013088393A JP 2011231775 A JP2011231775 A JP 2011231775A JP 2011231775 A JP2011231775 A JP 2011231775A JP 2013088393 A JP2013088393 A JP 2013088393A
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JP
Japan
Prior art keywords
weight
measuring
load
difference
automobile
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Pending
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JP2011231775A
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Japanese (ja)
Inventor
Yasushi Nakayama
泰 中山
Original Assignee
Daihatsu Motor Co Ltd
ダイハツ工業株式会社
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Priority to JP2011231775A priority Critical patent/JP2013088393A/en
Publication of JP2013088393A publication Critical patent/JP2013088393A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To highly accurately measure a weight difference before and after processing of an object even when the object is heavy one such as an automobile.SOLUTION: An object (automobile 10) to be measured is placed on a placing part 3a arranged on one side from a fulcrum 2 of a fluctuatable measurement base 3 and a weight 20 of almost the same weight as that of the automobile 10 is placed on a weight placing part 3b arranged on the other side from the fulcrum 2 of the measurement base 3. Load M1 received by a load measuring device 4 due to the fluctuation of the measurement base 3 is measured, and a weight difference δ1 between the automobile 10 before processing and the weight 20 is measured based on the load M1. Similarly a weight difference δ2 between an automobile 10' after processing and the weight 20 is measured. A weight difference of the automobile before and after processing is found out by calculating a difference of the weight differences δ1, δ2.

Description

  The present invention relates to a weight difference measuring apparatus that measures a weight difference before and after processing of an object to be measured.
  As a device for measuring the weight of a heavy object such as an automobile, for example, a device using a load cell as disclosed in Patent Document 1 is generally used.
JP 2007-93389 A
  By the way, in the automobile manufacturing process, it may be necessary to measure the weight difference of the automobile before and after processing. For example, in order to verify the application efficiency of automobiles (whether or not paint can be efficiently applied to automobiles), the application efficiency of paints (weight of paint applied to the vehicle body / weight of paint used) was measured. There are things to do. As a method of measuring the coating efficiency, the weight of the vehicle body before applying the paint and the weight of the vehicle body after applying the paint are measured, and the weight of the paint applied to the vehicle body is calculated from the difference between these measured values. May be measured. However, in general, since the load measuring device has a lower measurement accuracy as the maximum measurable weight is larger, for example, when measuring the weight of the vehicle body using the load cell as described above, the measurement accuracy is about 1% at most, and 300 kg. An error of about 3 kg will occur if the vehicle body is. The weight of the paint applied to the vehicle body is several kg, and measurement accuracy in units of 1 g is required to measure the coating efficiency. Therefore, in the measuring apparatus in which an error of 3 kg as described above is applied, it is applied to the vehicle body. It is not possible to accurately measure the weight of paint.
  For example, there are the following methods for measuring the paint applied to the vehicle body. (1) Cover the entire surface of the car body with aluminum foil, (2) Apply paint to the car body in this state, (3) Remove the aluminum foil from the car body, (4) Weight and application of the aluminum foil before application The weight of the paint applied to the vehicle body is measured from the difference from the weight of the later aluminum foil. However, the process of covering the entire surface of the vehicle body with an aluminum foil and the process of peeling the aluminum foil from the vehicle body are very time-consuming, resulting in a large number of work steps.
  The problem as described above is not limited to the process of measuring the weight difference before and after the application of the paint of the automobile, but similarly occurs when the weight difference before and after the processing of the heavy article is measured.
  A technical problem to be solved by the present invention is to measure a weight difference before and after processing with high accuracy even for a heavy object.
  The present invention made in order to solve the above-mentioned problems is a weight difference measuring device for measuring a weight difference before and after processing of an object to be measured, which is capable of swinging around a fulcrum and placing the object to be measured. A measuring platform having a mounting portion on one side of the fulcrum and a weight mounting portion for mounting a weight on the other side of the fulcrum, and provided below or above the measuring table. Based on the load measuring device that measures the load received from the measuring table by swinging, and the measured load by the load measuring unit, the weight difference between the measured object and the weight before processing, and the measured object and the weight after processing And a calculation unit for calculating the difference in weight.
  According to the above weight difference measuring apparatus, the load received from the measurement table is measured with the load measuring instrument in a state where the measurement object and the weight are placed on both sides of the fulcrum of the measurement table, and based on this measurement load The weight difference between the object to be measured and the weight can be obtained. In this case, the load measuring device need not be capable of measuring the total weight of the object to be measured, and therefore, a load measuring device having a relatively small maximum measurable weight and high measurement accuracy can be used. It is possible to accurately measure the weight difference between the measurement object and the weight. Therefore, the difference δ1 (= W1−W) between the weight W1 of the workpiece before processing and the weight W of the weight, and the difference δ2 (= W2) between the weight W2 of the workpiece and the weight W after processing. −W) is measured, and by calculating the difference between these weight differences δ1 and δ2, the weight difference δ (= δ2−δ1 = W2−W1) of the measured object before and after processing can be accurately measured. it can.
  If the position of the object to be measured placed on the placement part is shifted before and after processing, especially when the distance between the center of gravity of the object to be measured and the fulcrum is shifted before and after processing, the measurement accuracy of the weight difference will be reduced. It is preferable to provide a positioning part for positioning the object to be measured at a predetermined position in the placing part.
  As described above, according to the weight difference measuring apparatus of the present invention, the weight difference before and after processing can be measured with high accuracy even for a heavy object such as an automobile.
It is a side view of the weight difference measuring device concerning one embodiment of the present invention. It is a side view of the weight difference measuring device concerning other embodiments.
  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
  As shown in FIG. 1, the weight difference measuring apparatus 1 according to an embodiment of the present invention includes a measuring table 3 that can swing around a fulcrum 2, a load measuring device 4, and a calculating unit 5. In this embodiment, the case where a to-be-measured object is a motor vehicle is shown.
  The measurement table 3 is provided with a mounting portion 3a on which the automobile 10 is mounted on one side (left side in the figure) of the fulcrum 2, and a weight 20 is mounted on the other side (right side in the figure) of the fulcrum 2. A weight mounting portion 3b is provided. The fulcrum 2 is the center of oscillation of the measuring table 3 and extends in a direction perpendicular to the paper surface of FIG. In the following description, one side (left side in the figure) with respect to the fulcrum 2 of the measuring table 3 is referred to as “automobile side”, and the other side (right side in the figure) is referred to as “weight side”.
  The weight difference measuring device 1 is provided with a stopper for restricting the swing of the measuring table 3 at a predetermined position. In the example of illustration, the 1st stopper 6a contact | abutted from the downward direction to the motor vehicle side edge part of the measurement stand 3 and the 2nd stopper 6b contact | abutted from the downward direction to the weight side edge part of the measurement stand 3 are provided. Each of the first stopper 6a and the second stopper 6b is disposed at a position slightly spaced downward from the horizontal measurement table 3.
  The load measuring device 4 is provided below the measuring table 3 on the vehicle side from the fulcrum 2 and is in contact with the lower surface of the measuring table 3. The load measuring device 4 can measure a load received from the measurement table 3 when the measurement table 3 swings from a horizontal state. That is, when the measuring table 3 is in a horizontal state, the measurement load of the load measuring device 4 becomes 0, and the load is applied to the load measuring device 4 by swinging the automobile side of the measuring table 3 downward, and this load is measured. . As the load measuring device 4, a weight having a relatively small maximum measurable weight and a high measurement accuracy can be used. For example, a high-precision electronic balance can be used.
  Hereinafter, a weight difference measuring method before and after processing of an automobile using the weight difference measuring apparatus 1 having the above configuration will be described. In this embodiment, the case where the coating efficiency of the paint with respect to the automobile is measured by measuring the weight difference of the automobile before and after the painting process is shown.
  First, the weight 20 is placed on the weight placing portion 3 b of the measurement table 3. At this time, the weight side of the measuring table 3 swings downward, and the weight side end of the measuring table 3 is supported from below by the second stopper 6b. The weight 20 has substantially the same weight as the automobile 10 and does not exceed the weight of the automobile 10. Specifically, the difference between the weight W1 of the automobile 10 and the weight W of the weight 20 is set to be as small as possible within the range of the maximum measurable weight of the load measuring device 4. In addition, since it becomes necessary to change the weight of the weight 20 when the vehicle model to be measured is different, it is preferable that the weight 20 can be adjusted. For example, the weight can be adjusted by combining a plurality of adjustment weights. It can be set as a simple structure.
Next, the automobile 10 before painting is placed on the placement portion 3 a of the measurement table 3. In the present embodiment, the automobile 10 and the weight 20 are placed at a position equidistant from the fulcrum 2 (L 10 = L 20 ). At this time, since the weight W1 of the automobile 10 is slightly heavier than the weight W of the weight 20, the automobile side of the measuring table 3 swings downward, whereby the load measuring device 4 receives the downward load M1 from the measuring table 3, The load M1 is measured by the load measuring device 4. At this time, as shown in FIG. 1, the moment due to the weight W1 of the automobile 10, the weight W of the weight 20, and the support force R1 (the force that supports the load M1 received from the measurement table 3) by the load measuring device 4 is balanced. It becomes a state. Measuring load M1 by the load measuring device 4 at this time is transmitted to the calculation unit 5, the distance between the measuring load M1, the distance L 10 between the center of gravity and the fulcrum 2 of the automobile 10, the center of gravity and the fulcrum 2 of the weight 20 L Based on 20 and the distance L R between the measurement point of the load measuring device 4 and the fulcrum 2, the difference δ 1 (= W 1 −W) between the weight W 1 of the automobile 10 and the weight W of the weight 20 is calculated. The distances from the automobile 10 and the weight 20 and the fulcrum 2 are not necessarily equal.
  If the difference δ1 between the weight W1 of the automobile 10 and the weight W of the weight 20 is excessive, the automobile side end of the measuring table 3 swings downward greatly, and an excessive load is applied to the load measuring device 4. The load measuring device 4 may be damaged. In such a case, the first stopper 6a supports the vehicle side end of the measuring table 3 from below, thereby preventing an excessive load from being applied to the load measuring device 4.
Then, the unpainted automobile 10 is taken out from the placement section 3a, and after painting the automobile 10, the painted automobile 10 'is again placed on the placement section 3a. Then, the weight W2 of the automobile 10 ′, the weight W of the weight 20, and the moment due to the support force R2 by the load measuring device 4 are balanced, and the load M2 applied to the load measuring device 4 at this time is measured. The measuring load M2 is transmitted to the calculation unit 5, this measuring load M2, the distance L 10 described above, the distance L 20, and based on the distance L R, and the weight W of the weight W2 and the weight 20 of the vehicle 10 ' The difference δ2 (= W2−W) is calculated.
  After that, the calculation unit 5 calculates the difference δ (= δ2−δ1 = W2−W1) between the weight difference δ1 between the automobile 10 and the weight 20 before painting and the weight difference δ2 between the automobile 10 ′ and the weight 20 after painting. Is calculated, and this value is the weight of the paint applied to the automobile 10. At this time, since the weight W of the weight 20 is canceled, the weight of the application can be measured regardless of the accuracy of the weight W of the weight 20. Further, as described above, since the loads M1 and M2 are measured by the load measuring instrument 4 with high measurement accuracy, the accuracy of the weight differences δ1 and δ2 calculated based on the loads M1 and M2 is also high. Accordingly, the weight of the paint can be measured with high accuracy by obtaining the weight of the paint from the weight difference δ1, δ2.
  The present invention is not limited to the above embodiment. For example, in order to accurately compare the moment due to the weight of the measured object before and after machining, the measured object before and after machining needs to be placed at the same location on the placing part 3a, so that it is positioned on the placing part 3a. It is preferable to provide a part. In particular, since the distance between the measured object and the fulcrum is directly related to the magnitude of the moment, it is important to make the distance between the measured object and the fulcrum 2 before and after machining equal. Therefore, for example, a positioning portion that abuts on the object to be measured in the horizontal direction (left-right direction in FIG. 1) orthogonal to the extending direction of the fulcrum 2 can be provided (not shown).
Further, in the above embodiment shows a case in which the load measuring instrument 4 to the fulcrum 2 side of the center of gravity of the motor vehicle (L R <L 10), not limited to this. For example, as shown in FIG. 2, the load measuring device 4 may be arranged directly under the center of gravity of the automobile (L R = L 10 ). Further, as indicated by a dotted line in the figure, the load measuring device 4 may be arranged outside the center of gravity of the automobile (the side away from the fulcrum 2) (L R > L 10 ). Or you may provide the load measurement part 4 in the weight side rather than the fulcrum 2, as shown with the dashed-dotted line in the same figure. In this case, the load measuring device 4 is provided above the measuring table 3 and abuts on the upper surface of the measuring table 3. Then, when the weight side of the measuring table 3 swings upward, the load applied to the load measuring device 4 is measured. Of the positions of these load measuring devices 4, it is most preferable to arrange them directly below the center of gravity of the automobile as shown by the solid line in FIG. If the load measuring device 4 is provided on the fulcrum 2 side from the automobile, the load measuring device 4 having a large maximum measurable weight is required, and there is a concern that the measurement accuracy may be reduced. This is because it may be necessary to extend the equipment space by extending the table 3 to the outside. In FIG. 2, the calculation unit 5 and the stoppers 6a and 6b are not shown.
  Moreover, although the case where the weight difference before and behind the painting of the automobile was measured was shown in the above embodiment, the present invention is not limited thereto. For example, by measuring the weight difference between before and after machining a heavy object, the weight of the material removed by machining can be measured, and the yield can be evaluated.
DESCRIPTION OF SYMBOLS 1 Weight difference measuring apparatus 2 Support point 3 Measuring stand 3a Mounting part 3b Weight mounting part 4 Load measuring device 5 Calculation part 10 Car 10 '(before painting) Car 20 weight (after painting)

Claims (2)

  1. In the weight difference measuring device for measuring the weight difference before and after processing the workpiece,
    A fulcrum is swingable about the fulcrum, and the fulcrum has a placement part on one side of the fulcrum, and a weight placement part for placing a weight on the other side of the fulcrum. Based on the measurement load provided by the load measuring unit, the load measuring device that is provided below or above the measuring table, and that measures the load received from the measuring table by the swinging of the measuring table. Weight difference provided with a calculation unit for obtaining a weight difference between the previous measurement object and the weight and a weight difference between the measurement object after measurement and the weight, and calculating a difference between the weight differences. measuring device.
  2.   The weight difference measuring apparatus according to claim 1, wherein a positioning unit that positions the object to be measured is provided in the mounting unit.
JP2011231775A 2011-10-21 2011-10-21 Weight difference measuring apparatus Pending JP2013088393A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011231775A JP2013088393A (en) 2011-10-21 2011-10-21 Weight difference measuring apparatus

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Application Number Priority Date Filing Date Title
JP2011231775A JP2013088393A (en) 2011-10-21 2011-10-21 Weight difference measuring apparatus

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JP2013088393A true JP2013088393A (en) 2013-05-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015033108A1 (en) * 2013-09-04 2015-03-12 Metryx Limited Method and device for determining information relating to the mass of a semiconductor wafer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015033108A1 (en) * 2013-09-04 2015-03-12 Metryx Limited Method and device for determining information relating to the mass of a semiconductor wafer
US20160195424A1 (en) * 2013-09-04 2016-07-07 Metryx Limited Method and device for determining information relating to the mass of a semiconductor wafer
JP2016537641A (en) * 2013-09-04 2016-12-01 メトリックス・リミテッドMetryx Limited Method and apparatus for determining information relating to the mass of a semiconductor wafer
US9903750B2 (en) 2013-09-04 2018-02-27 Metryx Ltd. Method and device for determining information relating to the mass of a semiconductor wafer
TWI688021B (en) * 2013-09-04 2020-03-11 美特拉斯有限公司 Method and device for determining information relating to the mass of a semiconductor wafer

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