JPS639606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a load detection device for measuring the weight, plane center of gravity position, and height of the center of gravity of a vehicle including cargo.

Conventional load detection devices are shown in Figures 1, 2, and 3. First, the measurement principle will be explained with reference to Figures 1 and 2.The loading platen A is held horizontally as shown in Figure 1,
The object to be measured B is placed on it, the vertical loads W ₁ and W ₂ are measured by load cells C and D, and the weight W ₀ of the object to be measured is determined from the sum W ₁ +W ₂ . Next, when L is the distance between load cells C and D, the plane center of gravity position a is determined from W ₂ ·L/W ₀ , and the plane gravity center position b is determined from W ₁ ·L/W ₀ . Next _{, the} loading platen A is tilted at an angle θ as _shown in FIG _.
b) /W ₀・tanθ, or (W ₀・a−W ₂ ′・
Find the center of gravity height H from L)/W ₀ · tan θ. Next, a concrete example of a load detection device based on the above measurement principle is shown in the third section.
To explain with a diagram, A to D are the same parts as above, E ₁ and E ₂ are the lower and upper parts of the movable support legs, and the load cell C is interposed between the lower part E ₁ and the upper part E ₂ . One end of the loading platform A is pivotally supported by the upper part _E2 . Further, F is a male screw pivotally supported on the other end of the loading platform A, G is a female screw screwed into the same male screw F,
is a rotary drive device for the female thread G, J ₁ and J ₂ are support stands, and the load cell D is interposed between the support stands J ₁ and J ₂ , and rotates the female thread G to drive the male thread F. While moving up and down in the direction of the arrow, move the movable support legs E ₁ and E ₂ in the direction of the arrow to make the loading platen A horizontal, or
By tilting, the weight W ₀ of the object B to be measured,
It is designed to measure the plane center of gravity position a or b and the height H of the center of gravity.

In the load detection device, when the loading platen A tilts, the relative positions of the load cells C and D change, resulting in variations in measured values. In addition to the weight of the object to be measured B, the weight of the loading platen A is also applied to the load cells C and D, resulting in low measurement accuracy. While the male screw F is moved up and down by the female screw G and the rotary drive device, the movable support leg
Since E ₁ and E ₂ had to be moved horizontally, there was a problem that the structure became complicated.

The present invention addresses the above-mentioned problems, and includes a tilting table whose one end is pivotally supported, a vertical movement mechanism which supports the other end of the tilting table in a vertically movable manner, and a vertical movement mechanism disposed at intervals on the tilting table. at least two load cells installed, a loading board for the object to be measured supported by each of the load cells,
The present invention relates to a load detection device characterized by comprising a regulating means for regulating only the movement of the loading platform along the upper surface of the tilting table, and its purpose is to prevent variations in measured values. Measurement accuracy can be improved. Furthermore, it is an object of the present invention to provide an improved load detection device whose structure can be simplified.

The load detection device of the present invention comprises a tilting table having one end pivoted as described above, a vertical movement mechanism supporting the other end of the tilting table in a vertically movable manner, and disposed at intervals on the tilting table. It consists of at least two load cells, a loading plate for the object to be measured supported by each load cell, and a regulating means that restricts only the movement of the loading plate along the top surface of the tilting table, and tilts each load cell. Since it is fixed on the table, when the tilting table is tilted, the relative position of the load cell does not change, so there is no variation in the measured values. Furthermore, since the load plate, which is significantly lighter in weight than the tilting table, and the weight of the regulating means are simply placed on the load meter outside the object to be measured, measurement accuracy can be improved. Further, since the tilting table is simply tilted around one end by operating the vertical movement mechanism, the structure can be simplified.

Next, the load detection device of the present invention will be explained with reference to an embodiment shown in FIGS. 4 to 6. First, the measurement principle will be explained with reference to Fig. 4.The object to be measured 1 whose center of gravity is at point 5 horizontally and measure the loads at points P and Q.
If these values are W ₁ and W ₂ respectively, then the object to be measured 1
The weight W ₀ becomes W ₁ + W ₂ . Also, the horizontal distance a from the load measurement point P (or Q) to the center of gravity position
(or b) is, as already mentioned, a=W ₂・L/W ₀ (or b=W ₁・L/W ₀ )
Find it from... Next, as shown in Fig. 4, the loading platen 2, load cells 3, 4, and tilting table 5 are tilted to reduce the load _W
is applied to point R of the loading platen 2, the component force W _S of the weight W ₀ of the object to be measured 1 and the rotational moment due to the load W _R are measured using the load cells 3 and 4 (W ₁ ″,
In this case, the load cells 3 _and 4 are fixed at right angles to the tilting table 5, and they accurately measure the component force W _S perpendicular to the loading surface regardless of the inclination angle θ. .Also, the vertical supporting force at this time is
When W ₁ ′, W ₂ ′, the center of gravity height H can be found from H=(W ₁ ′・L−W ₀・b)/W ₀・tanθ, but W ₁ ′=W ₁ ″/cosθ Therefore, in the case of this load detection device, it is determined from H=(W ₁ ″・L/cosθ−W ₀・b) /W ₀・tanθ ……. Next, a specific example of this load detecting device based on the above measurement principle will be explained with reference to FIGS. 5 and 6. 1 to 5 are the same parts as above, except that there are two load meters 3a and 3b on one end side, There are two pieces 4a and 4b on the other end side, each of which is fixed to the tilting table 5. In addition, 6a and 6b are the load cells 3a and 3b,
A rod connecting the center of both sides of the loading platform 2, which is simply placed on 4a and 4b, and the other end of the tilting table 5 via pivots 7 and 8, 7 is a support fixed to the foundation, and 8 is the tilting table. 10 is a hydraulic cylinder; 9 is a hydraulic cylinder 1;
A shaft 11 pivotally supports the lower end of the hydraulic cylinder 10 on the other end of the tilting table 5.

Next, a measurement procedure using the load detection device will be explained. First, the object 1 to be measured whose weight is W ₀ and whose center of gravity is at the X position is placed on the loading plate 2 and fixed. Next, the hydraulic cylinder 10 is operated to rotate the tilting table 5 about the shaft 8 and hold it in a horizontal position. At this time, since the load cells 3a, 3b, 4a, and 4b measure the weight of the object to be measured 1 and the weight of the loading platen 2 and the rods 6a and 6b, the weight of the object to be measured 1 can be calculated by subtracting the latter weight. W ₀ is found. Next, assuming that the total load measured by the load cells 3a and 3b is _W1 , and the total load measured by the load cells 4a and _4b is W2, the plane center of gravity position a or b of the object to be measured 1 is determined from the above formula, and then The distance c between the object to be measured 1 and the straight line connecting the load cells 3a and 3b is measured, and this is subtracted from a above to obtain the position of the center of gravity d in the plane of the object to be measured 1. If this d is the plane center of gravity position in the left-right direction, then the plane center of gravity position e in the front-rear direction is similarly determined. Next, the hydraulic cylinder 10
is operated to tilt the tilt table 5 at an angle θ and read the indicated values of the load cells 3a, 3b, 4a, and 4b. These indicated values are W ₁ ″ and W ₂ ″, that is, the load cells 3a and 3b
The total value of W _{1″ is W 1} ″, and the total value of load cells 4a and 4b is
W ₂ '', the height of the center of gravity H is determined from the above formula. At this time, the weights of the loading platen 2 and the rods 6a and 6b are also subtracted.

Figures 7, 8 and 9 show the loading platen 2 and load cells 3a and 3.
b, 4a, 4b and the rods 6a, 6b as one measuring block, a plurality of measuring blocks are arranged in line on one tilting table 5, and a large number of load points are weighed simultaneously, and the load at each point is measured. 10 shows a piston 13 and a pivot shaft 7 attached to a tilting table 5 via a bearing 12. This is another embodiment in which the loading platen 2 is supported in a vertically movable manner.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the measurement principle of a conventional load detection device, and Figure 3 is a side view showing a specific example thereof.
FIG. 4 is an explanatory diagram showing the measurement principle of the load detection device according to the present invention, FIG. A plan view showing the embodiment, FIG. 8 is a side view thereof,
FIG. 9 is another side view, and FIG. 10 is a side view showing still another embodiment. 1...Object to be measured, 2...Loading board, 3a, 3b, 4
a, 4b...load meter, 5...tilting table, 6a, 6b...regulating means.

Claims (1)

[Claims] 1. A tilting table with one end pivoted, a vertical movement mechanism supporting the other end of the tilting table so as to be able to move up and down, at least two load meters disposed at intervals on the tilting table, and each of the respective loads. A load detection device comprising: a loading plate for an object to be measured supported by a meter; and a regulating means for regulating only the movement of the loading plate along the upper surface of the tilting table.