JPH07333044A - Load cell - Google Patents

Abstract

PURPOSE:To provide a load cell which can stably support and highly accurately measure a large weight/load. CONSTITUTION:A spherical pressure-receiving protrusion 5 is provided on an upper face at the center of an upper flange 2 of an I-steel, and perpendicular support walls 11 orthogonal to a web 4 of the I-steel are oppositely provided between upper and lower flanges 2, 3 on right and left of the protrusion 5. A horizontal slit-like cut groove 8 is provided at the center of the web 4 of the I-steel between the pair of opposite support walls 11, while a strain gauge 9 is provided to bridge over the cut groove 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a load cell for measuring the weight of a large and heavy tank, silo, large storage tank, building, machinery, hopper, etc. In addition to measuring the load / weight itself, it also measures the supply / change amount of the contained objects such as powder / particles, liquid, and luggage. It relates to a load cell used for this purpose.

[0002]

2. Description of the Related Art A load cell is known as a load cell for measuring a heavy object. This load cell receives the weight and load of an object to be measured at one point, a strain gauge is attached in the middle of a member that supports the load cell, the displacement and strain of the supporting member are measured, and the load is measured. Since this strain gauge is provided in the middle of a member that continuously receives a load, highly accurate measurement cannot be expected unless the displacement / strain of the member is large to some extent. Therefore, the displacement / strain becomes too large when measuring a large weight / load such as several tons or hundreds of kg, and the displacement / strain is accompanied by three-dimensional displacement / strain.
In addition to poor accuracy, it becomes impossible to support a large weight and load in terms of strength, and it may not be suitable for measuring extremely large loads and own weight. Further, since the object to be measured is supported by only one point, even if the object to be measured is supported by using a plurality of load cells, the measurement state becomes unstable, and there is a fear that the object to be measured is shaken or falls.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above problems of the prior art, to provide a load cell capable of stably supporting a large heavy load and a load, and measuring with high accuracy. To provide.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) A spherical pressure receiving projection is provided on the central upper surface of the upper flange of the I-shaped steel, and between the left and right upper and lower flanges of the pressure receiving projection. A vertical support wall perpendicular to the web of the I-shaped steel is provided so as to face each other, and a horizontal slit-shaped kerf is provided at the center of the vertical portion of the I-shaped steel between the pair of opposed supporting walls, and the strain gauge is provided in the same sulcus. 2) A load-measuring bolt, which is attached so as to bridge the two, wherein the upper flange portions outside the pair of support walls are provided with movement preventing bolts for connecting with an object to be measured placed on the pressure receiving projections. 1) The load cell according to 1) 3) The load cell according to 1) or 2), wherein the pressure receiving projection is a spherical body attached to the upper central surface of the upper flange. Here, the pressure receiving protrusion may be a spherical body,
It may also be a spherical convex portion. Further, the pressure receiving projection may be covered with a cap / pressure receiving plate to be loaded.

[0005]

In the present invention, the weight and load of the object to be measured are received by the spherical pressure receiving projections. The load of the pressure receiving projection acts on the web through the upper flange of the I-shaped steel, is supported by the left and right vertical support walls, and the load is transmitted to the lower flange. This load state is a model in which the load is applied in the middle of the beam fixed by the pair of left and right support walls. here,
Since a horizontal kerf is provided in the center of the web of I-shaped steel, the vertical load of the pressure-receiving projection directly acts on the upper part of the upper edge of the kerf, and the upper edge of the kerf moves downward. Large displacement. On the other hand, since the load is not directly applied to the lower part of the kerf of the web, the lower edge of the kerf is hardly displaced. Therefore, the strain gauge meter installed so as to bridge the kerf detects the displacement of the upper edge of the kerf and measures the load of the pressure-receiving protrusions. Since the displacement of the upper edge of the kerf is large and the displacement of the lower edge is not large, the strain sensed by the strain gauge is largely detected, and the load can be accurately measured.

Here, since the web has a kerf, the lower edge of the kerf is displaced vertically downward only, and is not displaced so as to bulge in the lateral direction (horizontal direction). Do not bend greatly to buckle. Therefore, the load can be measured with a strain gauge with high accuracy. Even if the upper flange and the object to be measured are bolted to each other outside the support wall, the stress / displacement due to the load applied through the bolt on the support wall is blocked and the displacement / strain between the support walls is affected. It does not affect the accuracy of load measurement. These bolts can prevent the measured object from moving and falling and can be stably supported.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the pressure receiving projection is constructed by holding a spherical body in the seat, and a connecting bolt is attached to the outside of the support wall. The load cell of this example is supported by four hoppers containing several tons of powder and granules, and the total weight of the hopper is measured by four load cells. This is an example of measuring the amount of change in body weight (supply amount).

FIG. 1 is a front view of the embodiment. FIG. 2 is a plan view of the embodiment. FIG. 3 is a side view of the embodiment. Figure 4
[FIG. 3] is an explanatory diagram showing a main part of the embodiment. FIG. 5 is an explanatory diagram showing a usage state of the embodiment. In the figure, 1 is an I type steel, 2 is an upper flange of the same I type steel, 3 is a lower flange of the same I type steel,
4 is a web of the same type I steel, 5 is a pressure receiving projection, 6 is a spherical body of the pressure receiving projection, 7 is a lower seat for holding the spherical body, 8 is a horizontal cut groove provided in the center of the web 4, 9 Is a strain gauge meter, 10 is a strain load converter for electrically converting the strain value of the strain gauge meter 9 into a load value, and 11 is an upper flange 2 and a lower flange 3 at symmetrical positions with respect to the spherical body 6 as a symmetrical center. A support wall orthogonal to the web 4 provided therebetween, 12 is a bolt attached to the upper flange 2 outside the support wall, 13 is a hopper to be measured, and 14 is a support arm having the hopper 13 attached to the outer peripheral wall. , 15 are attached to the bottom surface of the support arm, and the spherical body 6
The upper load seat is in direct contact with the jack, 16 is a jack for lifting the support arm 14, 17 is a granular material contained in the hopper 13, and 18 is a lead wire of the strain gauge meter 9.

In this embodiment, the total weight of the hopper 13 accommodating the particles 17 is supported by the load cells of the four embodiments. The weight of the hopper 13 is loaded from the lower support arm 14 to the center of the upper flange 2 via the upper load seat 15, the spherical body 6, and the lower seat 7. The upper flange 2 is fixedly supported by the left and right support walls 11, and the spherical body 6
Is applied to the center of the web 4 between the support walls 11.
Since the kerf 8 is provided in the center of the web 4, the web 4
The load from above the above will result in the downward displacement of the upper edge of the kerf. The amount of displacement is larger than that when there is no kerf. On the other hand, since there is no direct load on the lower edge of the kerf, it is not displaced so much, and the distance between the upper edge and the lower edge of the kerf changes greatly. Strain (displacement) is generated by the strain load converter 10 that performs electrical processing similarly to the strain gauge meter.
The magnitude of the load according to is calculated. The total weight of the hopper 13 is calculated by the sum of the four load values of the four load cells, and the weight of the contained powder and granules and its change amount (supply amount) are calculated from the weight value of the empty hopper. To be done.

The upper flange 2 and the hopper 13 of the load cell
The support arm 14 on the side is connected by a bolt 12. The bolt 12 prevents the support arm 14 from being displaced or shaken, prevents the support arm 14 from moving upward, and prevents the hopper 13 from tilting, moving, swaying, or tipping over, thereby supporting the hopper 13 in a stable manner. This bolt 1
The tensile force and the compressive force acting on 2 affect the load on the web 4 between the support walls 11 by the two support walls 11 (stress
Distortion / displacement fluctuation) is blocked. Further, since there are two bolts 12 symmetrically, the loads of the bolts 12 cancel each other out, and the influence is further weakened. Further, the tightening force of the bolt 12 is smaller than the force exerted on the spherical body 6 of the pressure receiving projection, and is mostly loaded on the spherical body 6. Therefore, the accuracy of measurement of the load by the bolt 12 hardly deteriorates.

[0011]

As described above, according to the present invention, several hundred kg
It is possible to measure with high accuracy for large weight and load of several tens of tons. In addition, with the bolts attached, it is possible to prevent flare, displacement, and tipping over, and to stably support the object to be measured. The structure is simple, highly accurate, and durable.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a side view of the embodiment.

FIG. 4 is an explanatory diagram showing a main part of the embodiment.

FIG. 5 is an explanatory diagram showing a usage state of the embodiment.

[Explanation of symbols]

 1 I-shaped steel 2 Upper flange 3 Lower flange 4 Web 5 Pressure receiving protrusion 6 Spherical body 7 Lower seat 8 Groove 9 Strain gauge meter 10 Strain load converter 11 Support wall 12 Bolt 13 Hopper 14 Support arm 15 Upper load seat 16 Jack 17 powder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B66C 13/16 A

Claims (3)

[Claims] 1. A spherical pressure receiving projection is provided on the upper central surface of an upper flange of the I type steel, and vertical support walls orthogonal to the web of the I type steel are provided between the left and right upper and lower flanges of the pressure receiving projection so as to face each other. A load cell characterized in that a horizontal slit-shaped kerf is provided in the center of a vertical portion of the I-shaped steel between a pair of opposing support walls, and a strain gauge meter is attached to the kerf so as to bridge the same. 2. The load cell according to claim 1, wherein movement preventing bolts are provided on upper outer flange portions of the pair of support walls, the movement preventing bolts being connected to an object to be measured placed on the pressure receiving projections. 3. The load cell according to claim 1, wherein the pressure receiving projection is a spherical body attached to the upper surface of the center of the upper flange.