JPS63149534A - Center-of-gravity detector - Google Patents

Abstract

PURPOSE:To calculate the center-of-gravity position of a shape of every kind easily and numerically, by combining two Roberval type load cells with a weighing stand equipped with two weighting blades. CONSTITUTION:Parallel weighting blades 6.61 are mounted to the under surface of a weighing stand 7 at an equal distance with respect to the center line of said stand 7 and respectively set to the blade receivers 5.51 provided to the weighting receivers 4.41 of two load cells 2.21. The wt. of an article to be measured is transmitted so as to be proportionally divided to the cells 2.21 according to the center-of-gravity position thereof. Since the wt. of the article to be measured is transmitted to two cells 2.21 so as to be proportionally divided to said cells 2.21 as mentioned above, by amplifying the outputs of the cells 2.21 to apply comparing operation thereto, the center-of-gravity position/moment of a complicated shape can be measured.

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Field of Industrial Application] The present invention is a centering detection method that numerically determines the position of the center of gravity and the amount of eccentricity of parts processed in a factory or assembled products. Concerning vessels.

[Conventional technology]

For example, with a simple shape like a baseball bat or golf club, just estimate the center of gravity on the ry/7-IJQ
AI+:p, Q PZW @rhlノLXlj,
/< Rough (71) If the object to be measured T is placed on the torsioned seesaw-shaped table a and the table is adjusted to a balanced position, the position of the rotation axis becomes the center of gravity.

[Problem that the invention seeks to solve]

However, when the object to be measured has a complicated shape or the amount of eccentricity with respect to the center of one sphere is expressed numerically, such a simple device is insufficient.

The present invention provides a center of gravity detector that numerically determines the position of the center of gravity and the amount of eccentricity of an article as described above.

Summary, Structure of the Invention [Means for Solving the Problems] The present invention has two weighted blades 6 and 61 mounted on the lower surface of the weighing platform 7 at equal distances and parallel to the center line of the weighing platform, Load cell 2/21 load receiver 4/4. Blade holder 5 provided in
・5! This is a center of gravity detector characterized in that the weighted blades described above are respectively set in the load cells, and the amount of balls of the object to be measured T is divided and transmitted to two load cells in proportion to the position of the center of gravity.

[For production]

With the above configuration, the weight of the object to be measured is transmitted to the two load cells in proportion, so by amplifying the output of the load cells and performing comparison calculations, even if the object has a complex shape, the center of gravity position and Moment etc. are measured.

〔Example〕

Figures 1 and 2 show the outline of the configuration of the present invention, and
Two load cells 2 and 21 are fixed to each other by means of load cell mounting bases 3 and 31, facing each other on top of the load cell. As shown in Figures 3 and 4, this load cell consists of vertically parallel bars 9 and 9.
I, with the fixed part lO and the weighted part 11 as rigid bodies, and upper and lower parallel bars 9, 9. Each connecting portion 12 is made into a node of a thin elastic body, and a strain gauge 13 is attached to each of the four nodes to form a Roveval type load cell. This load cell is characterized in that no matter where the load is applied to the processing material 4 fixed to the weight part 11, an error in unbalanced loading does not occur.

Now, in Fig. 2, load cell 2-2. Machining cost 4.4I is fixed to the weighted part of , and furthermore, blade supports 5.5I are fixed in parallel on top of it. Its blade holder 5. has a V-shaped groove, and another blade holder 5 is a flat blade holder.

Weighted blades 6 and 6I are attached to the lower surface of the weighing platform 7 at equal distances and parallel to the center line of the platform. Blade covers 8 and 81 are attached to both ends of the blade receiver 5-5□, and the weighted blades 6 and 6! prevents the movement of

With this structure, when the weighted blade 61 is set in the V groove of the blade holder 51 and the weighted blade 6 is received by the blade holder 5, part of the weight of the object T on the weighing platform 7 is transferred from the weighted blade 6 to the load cell 2. It is reported that the remaining part is weighted blade 6! From load cell 2. can be conveyed to. As described above, the load cells 2 and 21 are of the Roberval type, so the weight depends on the center of gravity position of the object to be measured, regardless of the load position thereof.

Therefore, the load to be received is determined by the weight sharing of the gravity of both layers 6 and 6I.

Load cells 2 and 21 each have an amplifier (not shown)
By connecting and adjusting the output sensitivity to the same output sensitivity, it is possible to know the center of gravity position of the object to be measured T (7) on the weighing platform 7.

In other words, the center of gravity of the double-layered heavy blade 6 is completely located at the center of the weighing table 7.
If they are equidistant from the fist 61, the outputs of both load cells 2 and 21 will be equal, and each will display the weight of the object to be measured.

In FIG. 5, the distance between the weighted blades 6 and 61 is L, and the weight displayed on both load cells 202 is W!・Assuming W2, the deviation (eccentricity) X of the center of gravity from the center of the weighing platform 7 is.

From equations (1) and (2) It is required as.

Next, an example of how to use the center of gravity detector will be described.

Find the deviation of the center of gravity from the center of the sphere. In Fig. 6, a cylinder 15 is attached to the center of the weighing table 7, a spherical object T is set thereon, and from the outputs of both load cells 2 and 2I at that time, the distance from the center to the horizontal axis X of the 7JtV diagram is determined. Find the deviation and set it as X. Next, point the object to be measured T at the arrow (1)
Rotate 90 degrees horizontally in the direction of
') IM/n/QA'rii11. , l jM value is set to 2. From these three values, the eccentricity γ is.

It is obtained as γ=, t11 shoulder=sub24 z 2-.

In addition, there is a small amount of a
Even if there is balance, it will not only cause vibration and shorten the lifespan, but also be dangerous.In order to obtain balance for the shaft as a whole, it is necessary to measure each blade, its weight, and the moment relative to the center of the shaft. Incorporate items with the same value in symmetrical positions,
You will achieve balance as a complete whole. Therefore, it is necessary to accurately measure the moment with respect to the axis of this complexly shaped part.

An example of the use of the present invention for such applications is shown in FIG.

The axis of the rotating shaft is aligned with the weighted blade 6, and the movable setting fitting 16 is placed on the weighing platform 7 at a distance r corresponding to the shaft radius.
Fixed to. Setting blade B to be measured with fitting 1
6, the moment of blade B relative to the weighted blade 6 is.

M=G(r+a) =W211L All! ! ! The amount is G=W, +W2, a is the center of gravity position of the blade, and undetermined is the weighted blade 6.6. When it is necessary to find the center of gravity position of the blade, it can be found from the formula.

Furthermore, in addition to the above method, there is also a method of controlling the feeding of the object to be measured on the weighing platform 7 so that the output of both load cells is the same, and aligning the center of gravity of one with the center of the weighing platform. These applied methods are all included in the measurement method using the center of gravity detector of the present invention, and detailed explanations thereof will be omitted.

C1 Effects of the invention As described above, by combining two Roberval type load cells and a weighing stand equipped with two weighted blades, it is easy to numerically determine the center of gravity position, its deviation amount, and moment f of various shapes. I was able to ask for it.

[Brief explanation of the drawing]

FIG. 1 is a front view explaining the present invention in detail, FIG. 2 is a side view thereof, FIGS. 3 and 4 are illustrations of the Roberval type load cell, FIG. 5 is a detailed explanation of the present invention, Figures 6 and 7 are explanatory diagrams of how to use the method to determine the deviation of the center of gravity from the center of gravity of a sphere. ) and (b) are explanatory diagrams of conventional center of gravity detectors. l...Surface plate, 2.2I...Roheval type load cell, 4.4. ...Processing cost, 5.51...Blade holder, 6.6
,... Weighted blade, 7... Weighing stand.

Claims (1)

[Claims] (1) Attach weighted blades equidistant and parallel to the center line of the weighing platform on the underside of the weighing platform, and set each of the weighted blades in the blade supports provided on the weighted supports of the two Roberval type load cells, A center of gravity detector characterized in that the weight of an object to be measured is transmitted to two load cells in proportion to the position of its center of gravity.