SE445858B - POWER Saturation Sensor for Electronic Trolleys WITH ONE WAY TO MAKE A SENSOR - Google Patents

Description

10 15 20 25 30 83051U8 ~ 6 2 attached drawings, which set out the principle of the invention and some practical embodiments, and in which: Figure 1 shows in principle the shape changes of an unloaded, a pressure-loaded and a tensile-loaded cell.

Figure 2 shows axonometrically an embodiment of the cell.

Figures 3, 4 and 5 show 5 different embodiments of the cell.

Figures 6, 7 and 8 show the upper part of a cell, there in it thin side has been made 0, 1 and 2 tapers.

Figures 9, 10 and 11 show the upper part of a cell, where they the thin sides form different angles with the load line.

Figures 12, 15 and 14 show different arrangements for congestion. protection.

The sensor according to the invention can be used both for pressure loading and tensile load. Figure 1 shows strongly exaggerated on which insert the left unloaded sensor cell changes shape at compressive and tensile loads. At pressure, the overload function the protection so that the cell at the center is provided with parallel, plane 1 perpendicular to the load line; which in the case of loading hits each other and prevents the thin sides 2 from bend more and break. The congestion limit can and should be is set so that in the thin sides does not arise permanently shape changes. In the case of tensile loads, such a simple load protection is of course not used, but the overload must be prevented by other means.

The construction of the transducer's measuring body or cell according to the invention gen is shown in more detail in Figure 2. Except for the mentioned mid-planes 1 and the thin sides 2 of the oblique parallelogram are located where the grams thick, virtually inflexible sides 3. Between the planes 1, a spacer 4 can be used as overload protection. up and down) are against 5! At each end of the cell (e.g. perpendicular, thus parallel to the plane 1 at the center of which there are threads in the direction of the load line the attachment holes 6. As mentioned.the cells are made by being pulled out of one metal profile rail perpendicular to this cut pieces of suitable thickness depending on the desired measuring range. Cell thickness play can also be changed if necessary by making incisions along them dashed lines 7 in figure 2. The resistance strain strips 8 can advantageously placed in the places shown in figure 2, but they can also placed elsewhere on the thin side or on each 10 15 20 25 30 35 8305108-6 side of this.

Figure 3 schematically shows a cell with the mentioned center planes 1 without spacers 4. Figure 4 shows a cell without spacers plan 1; in the case of tensile loads, these cannot be used. Figure 5 shows a cell, where the thick sides of the oblique parallelogram are arcuate and provided with a plane for a spacer.

Figure 6 shows the upper part of a cell, whose thin side_not has some tapers, Figure 7 a thin side that has one and figure 8 two tapers. These tapers are used next at low loads, then greater sensitivity of the cell is required.

Figure 9 shows a cell, the thin sides of which form a 900 angle with the load line. In Figure 10, the corresponding angle is 1200 and in Figure 11 600. However, the latter two cases should be avoided, for the more one deviates from 900 the more inaccurate the donor becomes.

Figure 12 shows how the overload protection spacer 4 can placed closest to the cell according to figure 3. It can be glued at the lower end and, if necessary, replaced. In the case of Figure 13, no spacer is required, but the center of the cell planes are already so close to each other that they already function as such as overload protection. Figure 14 shows how the spacer 4 can be placed in the cell according to Figure 5.

When the cell is loaded, shape changes are formed in the two barrels the pages in exactly the same way. Then the two ends of the thin ones the sides are attached to the thick sides (see fig. 1), then bend the thin sides when loading the cell in S-shape according to Figure 1, where it is easy to measure the shape changes. The figures 1, 2, 6, 7 and 8 give examples of the placement of resistance the location of the straps.

Compared with previous solutions, the invention offers the following benefits: - The oblique parallelogram shape, where the thin sides lie in right angle to the load line, gives extremely accurate values.

In the cell according to the invention it is easy to get the overload protection.

- The production of the cell becomes extremely economical when it can made from a drawn metal profile rail by cutting appropriate paragraphs.

Claims (3)

8305108-6 le PATENTKRAV Force measurement sensor for electronic scales and the like, which is based on measuring the elongation and compression in the surface layer of a loaded measuring body by a resistance strain technique known per se, where the resistance of the strain strips is measured by Then a bridge of resistance, characterized in that it consists of a diagonally loaded, mainly obliquely parallelogram-shaped piece, the two opposite sides of which are thick and relatively inflexible, while the other two sides, the so-called the measuring sides (2), at which the elongation strips (8) are located, are thin and lie perpendicularly or almost perpendicular to the load line, and that the measuring body has two surfaces (1) perpendicular to the load line, which when - the impact of the measuring body hitting each other restricts movement and thus constitutes overload protection. Sensor according to Claim 1, characterized in that the measuring sides (2) are provided with one or two tapers at the places where the elongation strips (8) are located. Sensor according to Claim 1, characterized in that the overload protection consists of two surfaces (1) located perpendicular to the load line at the center of the measuring body, which are pressed against each other in the event of overload or between which special spacers (4) can be applied. Method of manufacturing a sensor according to one of the preceding claims, characterized in that a metal profile rail of the shape and dimension of the measuring body is first produced by drawing, from which the individual measuring bodies are then manufactured by sawing off pieces of suitable length in in accordance with the desired measurement range.