JPS5892923A - Measuring apparatus for center of gravity position - Google Patents

Abstract

PURPOSE:To easily and accurately measure the center of gravity position of an object in the heightwise direction, not to mention the plane gravity center position thereof, by detecting vertical loads applied to a plurality of supporting members as well as the inclination angle of a tilting table. CONSTITUTION:The center of gravity position of an inclined object 1 in the heightwise direction is calculated as followed. Signals corresponding to reactions R'1, R'2, R'3 acting on hydraulic rams 12, 13, 14 respectively and a signal corresponding to an inclination angle theta are fed into an arithmetic device 23 to obtain the plane center of gravity position. Then, a signal corresponding to the plane center of gravity position and a signal from an inclination angle detector 22 are added together, and the center of gravity position in the heightwise direction is calculated by an arithmetic device 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a center of gravity measuring device for measuring the center of gravity of a test object such as a vehicle.

FIG. 1 and FIG. 2 are books showing an example of the configuration of a conventional gravity center position measuring device.

In FIGS. 1 and 2, an object to be measured 1 such as a vehicle is loaded on a ramp 2, and the ramp 2 is a ball [1fi].
2 load detectors 4.5j through 3? and a load detector, and is supported by 91 tilting mechanisms 6.

In the above-mentioned center of gravity position measuring device, the tilting table 2 is moved and tilted in the vertical direction by the tilting mechanism 6, and the center of gravity position of the object to be measured 1 in this tilted state is measured.

However, in the center of gravity position measuring device configured as described above, when tilting the tilting table 2, the distance l between the load detector 4.5 and the tilting mechanism 6 changes depending on the tilting angle. At the same time as moving the load detector 4 in the vertical direction.
5t - It has to be moved horizontally via the rail 7, which makes the moving mechanism complicated and reduces the measurement accuracy. The present invention has been developed in view of the above points. , the purpose is to place it within the plane of the object to be measured.

An embodiment of the apparatus of the present invention will be described below with reference to the drawings.

In FIGS. 3 and 4, the same parts of the dovetail are shown with the same reference numerals as in FIGS. 1 and 2.

The tilt table 8 on which the object to be measured 1 is loaded is tiltably supported by a frame 9 via a hinge 10 and a tilt mechanism 11, and the frame 9 is supported by a support member such as a hydraulic ram 12 via a spherical seat 12. It is supported by 13°14. The tilting mechanism 11 is.

A screw keyaki 15 rotatably supported on the upper end side by the inclined table 8;
A wheel member 16 that meshes with this screw keyaki 15 is composed of a motor (not shown) that rotates this wheel member 16, etc., and this tilting mechanism 11 moves the threaded rod 15 in the vertical direction by meshing with the wheel member 16. By doing so, the tilt table 8 is tilted.

FIG. 5 shows details of the hydraulic ram 12, 13, 14. The hydraulic ram mainly consists of a hydraulic cylinder 17 and a piston rod 18, and an oil chamber 19 formed by the hydraulic cylinder 17 and the piston rod IB. Pressure oil is supplied through a pressure oil pipe 20 from a hydraulic power source (not shown).

Also, the bistorage rod 18 of the hydraulic ram 12, 13, 14
In other words, a control device (not shown) is separately provided 9 to keep the height of the frame 9 constant, and this control device controls the vertical load acting on the hydraulic ram 12, 13, 14. The frame 9 is always held at a constant horizontal position by changing the oil pressure in the oil chamber 19 depending on the size. Reference numeral 21 denotes a pressure detector for detecting the hydraulic pressure in the oil chamber 9 of the hydraulic ram, and a tilt angle detector for detecting the tilt angle of the 22-piece ramp 8.

Next, the operation of the device of the present invention will be explained.

Since the distance j between the hydraulic rams 12 and 13 and the hydraulic ram 14 is known in advance, it is input into a computing unit to be described later. In addition, the tilting table 8° frame 9 excluding the object to be measured 1. The weight of the tilting mechanism 11 and the like is also detected by the hydraulic ram and input into the calculator.

First, a case will be described in which the planar center of gravity position of the object to be measured l is measured.

The object to be measured 1 is loaded on the inclined table 8 so as to be on the center line of the hydraulic rams 12, 13, as shown in Fig. In the case of 9, the plane center of gravity position a1 of the object to be measured l can be found from equation (1).

a knee Rs t・・・・・・・・・・・・・・・
(1) R1 midbrain In Figure 6, Rie Itl * Ra is the reaction force of the load acting on the hydraulic ram 12°13.14, and l is the distance between the hydraulic ram 12.13 and the hydraulic ram 14. .

Next, a case will be described in which the helical center position hot in the height direction of the object 1 to be measured is measured in a tilted state.

FIG. 7 shows the next state Jgl which is tilted by an angle θ from the horizontal state by operating the tilting table 8t and the tilting mechanism 11. The tilting mechanism 11 tilts all of the tilting tables until a desired tilting angle θ is reached. At this time, the tilting angle θ of the tilting table 8 is detected by the tilting angle detector 22. In addition, when the object to be measured 1 is not loaded on the slope table 8 in advance, the slope table 8
is tilted by an angle θ by the operation of the tilting mechanism 11, and the positions of the center of gravity in the height direction of the hinge lO and the tilting mechanism 11 at this time are determined and these values are input into the calculator.

When the object to be measured l is loaded on the inclined table 8 so as to be on the center line of the hydraulic ram 12°130 as shown in Fig. 3, the relationship is (
2), as shown in (8).

a2-alO)lθ-(hO+h) Sinθ...
・・・・・・C) (R1'10Rm')Illusion-Rs'
l・・・・・・・・・・・・・・・・・・(8) 7th
In the figure, h is the distance from the tilting table 8 to the hinge 10,
R'1sR's *R's indicates the reaction force acting on the hydraulic ram 12, 13, 14 when the ramp 8 is tilted by the inclination angle e.

Therefore, from equations (2) and (8), when the measured object 1 is loaded on the tilt table 8 and tilted by the inclination angle θ, the measured object 1
The center of gravity position in the height direction ho Fi is determined from equation (4).

FIG. 8 shows an arithmetic circuit for calculating the horizontal center of gravity position of the object to be measured l and the center of gravity position in the height direction in an inclined state from the above equations (1) to (6). When calculating the plane center of gravity position of l, the hydraulic ram 12
．． 13. Calculate by inputting a signal corresponding to the reaction force R1m R2* Rs acting on 14 to the calculator 23, and calculating each signal, l input in advance, and the weight of the device itself in the calculator 23. 〇The position of the center of gravity in the height direction of the object to be measured 1 in the inclined state can be determined by inputting signals corresponding to the action on the hydraulic rams 12, 13, and 14 to the calculator 23 to obtain the position of the center of gravity in the plane. It is calculated by adding a signal corresponding to the gravity position and a signal corresponding to the signal from the inclination angle detector 22, and by calculating the gravity center position in the height direction using the calculator 24.

The center of gravity position measuring device of the present invention can easily measure 10 weights of objects to be measured.

That is, the inclined table 8. Assuming that the weight of only the device such as the frame 9 is W, the force F acting on the hydraulic rams 12, 13, and 14 in the next state after the object 1 to be measured is loaded on the inclined table 8 is as shown in the equation (η).

F = Wo + W・・・・・・・・・・・・・・・
......(η In formula (7), since the self-weight W is known in advance, it can be corrected in advance, so the object to be measured 1
The zero weight Wo is determined from (8).

Wo = R1+R* 10 Rs ・−・・・・e・・−
(8) As explained above, according to the present invention, by detecting the vertical loads applied to the plurality of supporting members and detecting the inclination angle of the tilt table, the planar center of gravity position of the object to be measured can be determined. Of course, the position of the center of gravity in the height direction can be easily and accurately measured.

In one embodiment of the present invention, the vertical load applied to the hydraulic ram of the support member is detected, but it is also possible to support the frame with another support member and detect it with a load cell without using the hydraulic ram. It is.

[Brief explanation of drawings]

1 and 2 are diagrams showing the configuration of a conventional center of gravity position measuring device, FIGS. 3 and 4 are diagrams showing the configuration of the center of gravity position measuring device of the present invention, and FIG. 3 is a plan view, and FIG. Figure 4 is a front view of Figure 3, Figure 5 is a diagram showing details of the load needle in the center of gravity position measuring device of the present invention, and Figure 6 is a diagram showing the planar center of gravity position of the object to be measured using the center of gravity position measuring device of the present invention. Fig. 7 is a principle diagram for measuring the center of gravity position t-'i' in the height direction of the object to be measured by the centroid position measuring device of the present invention; Fig. 8 is a principle diagram for measuring the centroid position of the present invention. FIG. 2 is a block diagram showing a control circuit in the position measuring device. 1...Object to be measured, 8...Inclination table, 9...Frame, 11...Inclination mechanism, 12.13.14...Support member representative patent attorney Usui 1) Yukihito Toshi 1I21 No. 2 Lo ¥ J 3 Mouth ¥ 14 Figure 5) 5 Otsu

Claims (1)

[Claims] 1. A table on which the object to be measured is loaded, a frame that supports this table in a tiltable manner, lI number of support members that support this frame, ft1#, St + inclination angle of the marking table and vertical axis applied to the support members, respectively. A center of gravity position measuring device characterized in that the center of gravity position rIt of a measured object is measured from a signal corresponding to a load.