JPS632331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to weighing machines, and more particularly to truck scales.

There have been various types of truck scales, and Figure 1 is a schematic side view showing one example. In the figure, a truck (not shown) loaded with goods is placed from slope 1 or 2. Get on board 4. A pit 3 is formed between the slopes 1 or 2, and the above-mentioned mounting plate 4 is supported by a plurality of, for example, four, load cell units 5 arranged on the bottom surface 3a. The truck loaded with goods is placed on the loading board 4.
When placed on top, the load cell unit 5 receives the weight W of the loaded truck as a drag force against the bottom surface 3a of the pit 3 via their drag portions 5a, and the load cell unit 5 receives the weight W of the loaded truck as a drag force against the bottom surface 3a of the pit 3. It is weighed as follows.

However, in this case, only the vertical or longitudinal load Pv needs to be applied to the load cell unit 5, but when the truck rides on the mounting plate 4, the frictional force between its tires and the mounting plate 4 is In many cases, a horizontal or lateral load P _H is generated on the load cell unit 5 due to the bending of the mounting plate 4 or the like. In this case, the load cell unit 5 senses the lateral load as well as the movement of the load point, thus reducing the weighing accuracy.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a weighing machine capable of weighing an object, for example, a truck loaded with goods, with higher accuracy than the conventional weighing machine. According to the invention, this purpose is achieved by providing a mounting plate on which an object to be weighed is placed, a load cell,
a first spherical receiving member fixed to the mounting plate side and located on one diagonal corner of the quadrilateral, each having a spherical concave surface, fixed to the mounting plate side and located on the other diagonal corner of the quadrilateral; second spherical receiving members located on the load cell side, each having a flat surface;
a third spherical receiving member located opposite to the first or second spherical receiving member, each having a spherical concave surface, the first spherical receiving member or the second spherical receiving member and the third spherical member; This is achieved by a weighing machine consisting of a receiving member and a sphere held by a receiving member.

Hereinafter, details of the present invention will be explained based on illustrated embodiments.

FIG. 2 is a side view of the track scale according to this embodiment, and in the figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals. The load cell units 6A and 6B according to this embodiment are the fourth
As shown in the figure, load cell units 6A are provided below the mounting plate 4 at four corners of the quadrilateral, each having exactly the same configuration, but located at one diagonal corner of the quadrilateral. A first spherical receiving member 13 having a spherical concave surface is fixed to the mounting plate 4 facing the load cell unit 6B located on the other diagonal corner of the quadrilateral. A second spherical receiving member 15 having a flat surface is fixed.

The load cell units 6A and 6B support the entire load cell unit 6 on a load cell main body 7, main body support arms 8a and 8b, and a base 10, and support pillars 9a and 9b fixed to the main body support arms 8a and 8b with bolts. A load transmission member 11 that engages at the center of the load cell body 7, and this transmission member 11
The third spherical receiving member 12 is fixed to and has a spherical concave surface. On the other hand, as described above, the first spherical receiving member 13 and the second spherical receiving member 15 are mounted on the mounting plate 4 to accommodate the load cell unit 6A or 6.
A steel ball 14 is held between the first and second spherical receiving members 13 and 15 and the third spherical receiving member 12, respectively.

In the above configuration, when the truck rides on the mounting plate 4, its weight is applied to the center part of the load cell body 7 through the load transmission member 11, and this load is applied to the left and right parts of the load cell body 7. This causes distortion in the pair of load sensing arms 7a and 7b, and as a result, the weight of the truck is measured.If a lateral load occurs, for example, a load P _H as shown in Fig. 3 will occur. Even if the mounting plate 4 moves in this direction depending on the magnitude of the load.
At this time, in the load cell unit 6A, the movement of the spherical receiving member 13 is limited according to the curvature of its concave surface, but most of the lateral load is absorbed by the load cell unit 6A due to the slight movement of this part. Such lateral loads are greatly reduced and there is almost no movement of the load point to the load cell. That is, as the mounting plate 4 moves, the steel balls 14 roll and slip, and a lateral load is applied to the load cell units 6A, 6B via the concave surface of the third ball receiving member 12, but most of the load is applied to the load cell units 6A, 6B. The lateral load P _H is released by the relative movement of the placing plate 4 with respect to the load cell units 6A and 6B. Lateral load P _H
are not necessarily applied equally to the load cell units 6A and 6B, so the first and second
The lateral load at the position corresponding to the ball bearing members 13, 15 is reduced depending on the curvature of the surface in contact with each steel ball 14, and the load cell unit 6A, 6B is reduced in particular. In the unit 6B, since the surface of the ball receiving member 15 in contact with the steel ball 14 is flat, the lateral load is released in an almost ideal manner. Also, as a result of almost no movement of the load point to the load cell, the weight of the truck can be measured very accurately. In particular, as the first and second spherical receiving members 13 and 15 are provided facing each other on the diagonal lines of the quadrilateral as shown in FIG. 4, the mounting plate 4 moves significantly in this direction due to lateral loads Even if you try, the second and third
is limited by the spherical concave surfaces of the ball receiving members 13 and 12, and the mounting plate 4 is moved from the steel ball 14 to the steel ball 14.
are the first, second and third spherical receiving members 13, 15,
12, and the weight of the truck can always be measured stably.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, the above embodiments have been described with reference to the case where they are applied to truck scales, but the present invention is not limited thereto and can be applied to various weighing machines.

As described above, the weighing machine of the present invention can weigh objects extremely accurately even when a lateral load is applied to the weighing plate.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a conventional track scale, Fig. 2 is a schematic side view of a track scale according to an embodiment of the present invention, and Fig. 3 is an enlarged side view of the main parts of the track scale to explain its operation. , and FIG. 4 are plan views of the same truck scale. In addition, in the figure, 4... mounting plate, 6A, 6B
Load cell unit, 12... Third spherical receiving member, 13... First spherical receiving member, 14... Steel ball, 15... Second spherical receiving member.

Claims (1)

[Claims] 1 A loading plate on which an object to be weighed is placed, a load cell, a first plate fixed to the aforementioned loading plate side, located at one diagonal corner of a quadrilateral, each having a spherical concave surface.
a second spherical receiving member fixed to the mounting plate side and located on the other diagonal of the quadrilateral and each having a flat surface; a second spherical receiving member fixed to the load cell side and located on the other diagonal of the quadrilateral; A third spherical receiving member located opposite to the second spherical receiving member and each having a spherical concave surface, the first spherical receiving member or the second spherical receiving member and the third spherical receiving member. A weighing machine consisting of a sphere held between two hands.