JPS6111625Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a load cell that facilitates so-called four-corner adjustment.

For example, it consists of a horizontal part with a strain gauge pasted at a predetermined position, a pair of vertical parts disposed at both ends of the horizontal part, and a pair of leaf springs disposed between the upper and lower ends of the vertical part. In this load cell, the above-mentioned vertical portions and both leaf springs constitute a so-called Roberval mechanism, and if both leaf springs are not in a completely parallel state, a weighing error will occur. Conventionally, when a so-called four-corner error occurs during weighing, one of the bolts that fasten the end of the leaf spring to the vertical part is loosened or tightened, and the bolt corresponding to the weighing error is loosened or tightened. Although this adjustment is being carried out, in reality, such adjustment involves changing the relative relationship between the leaf spring and the vertical portion, so it is difficult, very time-consuming, and takes a long time.

Therefore, the present invention provides a load cell that solves these problems.

Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 and 2. Reference numerals 1 and 2 refer to a pair of vertical walls parallel to each other at a constant interval; 3 support blocks disposed on each of the vertical walls 1 and 2; 5 and 6;
is between the upper ends of both blocks 3 and both vertical walls 1, 2
A pair of parallel leaf springs 7 are arranged between the lower ends of the horizontal columnar rods, each of which has a small diameter portion 7a at both ends and is a round bar that is fitted into a through hole formed in the center of each vertical wall 1, 2. The upper and lower surfaces of the center of the horizontal columnar body 7 are cut in two stages to form a constricted portion 7b. Reference numeral 8 indicates two strain gauges each attached to the upper and lower surfaces of the constricted portion 7b, and reference numeral 9 indicates a screw extending through the end of the upper leaf spring 5 and each support block 3 to the upper surface of each vertical wall 1, 2. This bolt is screwed into the hole and fixes the leaf spring 5 and the support block 3 to the vertical walls 1 and 2.
Numeral 10 is a bolt that fixes the end of the lower leaf spring 6 to the vertical walls 1 and 2. Numeral 11 is a bolt whose lower part passes through a through hole in a shelf 3a that extends horizontally from each support block 3, and whose upper part passes through a through hole in a shelf 3a that extends horizontally from each support block 3. The threaded rod 11a passing through the through hole of the leaf spring 5 is a flange projecting from approximately the center of the threaded rod, and is located on the shelf 3a. 12 is a stopper nut that is screwed onto the lower end of each threaded rod 11; 13 is a tightening nut that is screwed onto the threaded rod 11 while holding the leaf spring 5; and 14 is a stopper nut that is disposed between the upper tightening nut 13 and the leaf spring 5. washer, 15
16 is a reinforcing plate for preventing buckling of each leaf spring 5, 6; 16 is a bolt for fixing each vertical wall 1, 2 to the horizontal columnar body 7;
17 is a bellows.

When using the load cell with the above configuration as a "scale", for example, one vertical wall 1 is connected to the fixed support 18
An L-shaped rod 19 is disposed on the other vertical wall 2, and the load of the heavy object to be weighed is applied to the tip of the L-shaped rod 19 in the direction of arrow A.

In addition, if a weight error occurs during weighing, tighten or loosen the tightening nut 13 that is threaded onto the threaded rod 11 corresponding to the error, and connect the upper leaf spring 5 to the lower leaf spring 6. What is necessary is just to approach or separate as appropriate. This is what is called a four-corner adjustment.

In the above embodiment, the strain gauges 8 were attached to the upper and lower surfaces of the constricted portion 7b, but instead of this, as shown in FIG. It may be configured such that a shearing force is applied to 8 (second embodiment).

Furthermore, as shown in FIG. 4, the present invention can also be applied to a load cell such as a combination of two load cells of the first embodiment; in this case,
When using this load cell as a scale,
The central vertical wall 20 supporting the center of the horizontal columnar body 7 is placed on the fixed body 21, and the load of the weight to be weighed is applied to the vertical walls 1 and 2 located on both sides in the direction of arrow A. Note that the same components as those in the first embodiment are given the same numbers and their explanations are omitted (third embodiment).

In the third embodiment, a strain gauge may be attached to the side surface of the constricted portion 7b as in the second embodiment (fourth embodiment).

As described above, according to the load cell of the present invention, one end is supported by each vertical part, and the other end engages with a leaf spring, and the distance adjuster allows the leaf spring to approach or move slightly away from the horizontal part. Therefore, if a weighing error occurs during weighing, all you need to do is move the part of the leaf spring corresponding to the error a little closer to or further away from the horizontal part using the above-mentioned spacing adjustment tool. . In this case, since such adjustment can be made without changing the relative relationship between the leaf spring and the vertical portion, so-called four-corner adjustments can be easily made in a short time.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. FIG. 3 is a longitudinal cross-sectional view showing a second embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional view showing a third embodiment of the present invention. 1, 2... Vertical wall, 3... Support block, 3a
...shelf section, 5, 6 ... leaf spring, 7 ... horizontal columnar body (horizontal part), 7b ... constriction section, 8 ... strain gauge, 11 ... threaded rod (interval adjuster), 12 ...
Stopper nut, 13...Tightening nut.

Claims (1)

[Scope of utility model registration request] A load cell that has a horizontal part with a strain gauge attached to a predetermined position, a plurality of vertical parts arranged at appropriate locations on the horizontal part, and a leaf spring arranged in the horizontal direction between the vertical parts. A load cell characterized in that a distance adjusting device is provided, one end of which is supported by each vertical portion, and the other end of which engages with a leaf spring to move the leaf spring slightly closer to or further away from the horizontal portion.