JPS6314764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load cell scale suitable for measuring relatively light weights.

Conventionally, in the case where the fixed part of the beam is fixed to the base located on the bottom side, there is a cover that covers the beam, so in order to place the tray on the movable part of the beam, a tray support frame consisting only of a skeleton is required. It is something that must be done. Therefore, as load cell scales of this type become lighter, the weight of the pan support frame becomes a load on the weighing section, which affects accuracy and sensitivity. Also,
It is also difficult to place the tray on the tray support frame because the tray is flat.

The present invention has been made in view of these points, and aims to provide a load cell scale in which there is no need to provide a pan support frame, the mounting tray is easy to attach, and no overload is applied to the beam. This is the purpose.

The present invention provides a beam in which a fixed part and a movable part are connected by a movable arm formed with a strain body, the fixed part is suspended and fixed to a cover of a main body, and the fixed part is fixed to a cover of a main body through a through hole formed in the cover. Connect the support of the inserted tray to the movable part, form a boss part and a hole that face each other with a certain gap in the horizontal direction in the opposing part of the dish and the main body, and form a hole in the boss part. It is characterized in that a protrusion formed around the hole and a convex part formed around the hole are vertically positioned and opposed to each other with a certain gap therebetween. Therefore, since the fixed part of the beam is suspended and fixed to the cover, the lower part of the cover is open, which allows the mounting plate to be directly connected to the movable part of the beam, and also allows the mounting plate to be connected directly to the movable part of the beam. A boss part and a hole that face each other with a certain gap in the horizontal direction are formed on the facing part of the mounting plate and the main body, and a protrusion formed around the boss part and the periphery of the hole are used to control the movement in the vertical and horizontal directions. By placing the convex parts formed in the vertical direction and facing each other with a certain gap, it is possible to keep the beam within a certain range, thereby preventing overload from being applied to the beam. In addition, since the boss, hole, protrusion, and protrusion that suppress the movement of the tray within a certain range are formed in one place, the stopper function can be concentrated in one point, and the stopper's It requires only a small space, and can be formed at any position between the mounting plate and the main body where it will work most effectively. It is configured so that it can be easily manufactured.

An embodiment of the present invention will be described based on the drawings.
First, a main body 1 is provided. This main body 1 includes a cover 2 with a downward opening and a bottom plate 3 that closes this opening.
Rubber feet 4 are fixed to the bottom plate 3.

A through hole 6 is formed in the center of the rear half of the upper surface 5 of the cover 2, and a protrusion 8 having a hole 7 is formed around the through hole 6. Further, a mounting frame 10 is fixed to the inside of the upper surface 5 by screws 9, and a hole 11 of the mounting frame 10 through which the screw 9 passes is formed larger than the outer diameter of the screw 9. The mounting frame 10 has a through hole 1 located below the through hole 6.
2 and a boss portion 13 are formed.

A lightweight beam 14 made of aluminum is provided. A fixed part 16 is formed on one side of the beam 14 and is suspended and fixed to the boss 13 with a screw 15, and a movable part 17 is formed on the other side. is formed. Next, a strain-generating portion 19 is formed on the movable arm 18,
This strain generating part 19 has a strain gauge (not shown).
is attached. Further, a regulating hole 21 is formed in the lower part of the movable part 17, into which a stopper 20 provided on the mounting frame 10 is inserted with a gap, and this gap is the elastic limit of the strain-generating part 19 in the vertical direction. It is determined within. A semicircular recess 22 is formed in the upper part of the movable part 17.

Thus, a plate-like mounting plate 23 is provided. A convex portion 24 and a boss portion 25 are formed between the convex portion 24 and the boss portion 25 on the surface of the mounting plate 23 facing the upper surface 5,
The convex portion 24 faces the protrusion 8 with a gap therebetween and serves as a part that restricts the downward movement of the plate 23, and the gap is set within the downward elastic limit of the strain-generating portion 19. It is being The boss portion 25 is inserted into the hole 7 with a gap therebetween, and serves as a portion for regulating the movement of the mounting plate 23 in the horizontal direction, and the gap is within the horizontal elastic limit of the strain-generating portion 19. It is stipulated in In addition, the above-mentioned plate 23
A support post 26 is integrally formed in the center of the support support 26, which is inserted through the through hole 6, and connects the protrusion 24 and the protrusion 8, the boss portion 25 and the hole 7,
It is positioned by a semicircular convex portion 27 that fits into the semicircular concave portion 22 and is connected to the movable portion 17 with a screw 28 .

In such a configuration, the mounting plate 23 is connected to the movable part 1.
7, first insert the support column 26 through the through hole 6 and the through hole 12, insert the boss portion 25 into the hole 7 with the protrusion 24 and the protrusion 8 facing each other, and then insert the support post 26 into the hole 7. The semicircular convex portion 27 is fitted into the circular concave portion 22. Therefore, the plate 23 is positioned while each component is engaged, and the connection is facilitated. The fixed portion 16 of the beam 14 is attached to the mounting frame 1.
Since the lower part of the beam 14 is open and the cover 2 is also opened downward, the support 2 is attached to the movable part 17 with the screw 28 from below.
6 are connected, and the plate 23 described above can be connected to the movable part 17 without using a plate support frame. Therefore,
There is no need to provide a pan support frame, the weight is reduced by that amount, the load on the strain generating part 19 is reduced, and accuracy and sensitivity are improved. Finally, the bottom plate 3 is attached to the cover 2 to close the bottom.

Therefore, when an object to be weighed is placed on the plate 23 attached to the movable part 17 in this way, the strain-generating part 19 is distorted. Then, an electrical output corresponding to this amount of strain is obtained by the strain gauge, and is finally transmitted to a digital display section (not shown) to display the weight of the object to be measured.

Next, the strain-generating portion 1 is placed in the center of the plate 23.
When an object to be weighed exceeding the downward elastic limit of 9 is placed, the upper part of the regulation hole 21 and the stopper 20
The upper part of the protrusion 8 and the convex part 24 come into contact with each other before the elastic limit of the strain generating part 19 is exceeded, and the movement of the plate 23 is prevented, the load on the strain generating part 19 is kept within the elastic limit, and the load on the strain generating part 19 is suppressed. Prevent damage.

Further, when an object to be weighed is placed on one side of the plate 23 and exceeds the downward elastic limit of the strain-generating portion 19, the protrusion 8 and the convex portion 24 become strain-generating portions. Before the elastic limit of 19 is exceeded, the plate 23
The load on the strain-generating portion 19 is kept within the elastic limit and damage to the strain-generating portion 19 is prevented.

Then, even if the load exceeds the upper elastic limit of the strain-generating part 19, the upper part of the regulating hole 21 and the upper part of the stopper 20 come into contact with each other before the elastic limit of the strain-generating part 19 is exceeded, and the loading is stopped. Movement of the plate 23 is inhibited to keep the load on the strain-generating portion 19 within the elastic limit, thereby preventing damage to the strain-generating portion 19.

Even if a load is applied to the plate 23 exceeding the elastic limit in the horizontal direction of the strain-generating portion 19, the hole 7 and the boss portion 25 come into contact with each other before the elastic limit of the strain-generating portion 19 is exceeded, and the loading plate 23 is prevented from moving, the load on the strain-generating portion 19 is kept within the elastic limit, and damage to the strain-generating portion 19 is prevented.

Therefore, when it is necessary to adjust the gap between the hole 7 and the boss portion 25, loosening the screw 9 a little allows the mounting frame 10 to be adjusted since the hole 11 is formed larger than the outer diameter of the screw 9. Adjustments are made by moving.

In this embodiment, the hole 7 and the protrusion 8 were formed on the upper surface 5, and the convex part 24 and the boss part 25 were formed in the mounting plate 23, but the boss part was formed on one side and the cylindrical part was formed on the other side. A protrusion may be formed, and the boss portion may be inserted into the protrusion while leaving a gap.

As described above, the present invention provides a beam in which a fixed part and a movable part are connected by a movable arm on which a strain body is formed, and the fixed part is suspended and fixed to the cover of the main body, and the fixed part is fixed to the cover of the main body. connecting the support of the mounting plate inserted through the through-hole to the movable part, and forming a boss part and a hole that face each other with a certain gap in the horizontal direction in the opposing part of the plate and the main body; The protrusion formed around the boss part and the convex part formed around the hole are vertically positioned and facing each other with a certain gap between them, so that the fixing part of the beam does not touch the cover. Because it is suspended and fixed, the lower part of the cover is open, which allows the mounting plate to be directly connected to the movable part of the beam, and also prevents the vertical and horizontal movement of the mounting plate. A boss part and a hole are formed in opposing parts of the dish and the main body with a certain gap in the horizontal direction, and a protrusion formed around the boss part and a convex part formed around the hole are formed. By placing them vertically and facing each other with a certain gap, it is possible to fit within a certain range, which prevents overload from being applied to the beam. Since the boss, the hole, the protrusion, and the convex part that suppress the movement within a certain range are formed in one place, the stopper function can be concentrated in one point, and the space for the stopper can be small. They can be formed at any position between the mounting plate and the main body where they work most effectively, and the bosses and holes, as well as the protrusions and convexities, can be formed by molding, making it easy to manufacture. This has the advantage of being easy to use.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention;
Fig. 2 is a longitudinal side view, Fig. 3 is a partial longitudinal side view showing how the mounting frame and fixed part of the beam are attached, and Fig. 4 is a partial longitudinal side view showing how the movable part of the beam is attached to the support. It is. 1...Body, 2...Cover, 6...Through hole, 7
... hole, 8 ... protrusion, 14 ... beam, 16 ...
Fixed part, 17... Movable part, 18... Movable arm,
19... Strain part, 23... Placing plate, 24... Convex part,
25...Boss department.

Claims (1)

[Claims] 1 A beam is provided in which a fixed part and a movable part are connected by a movable arm having a strain-generating part, the fixed part is suspended and fixed to a cover of the main body, and the beam is inserted through a through hole formed in this cover. A supporting column of the mounting plate is connected to the movable part, and a boss part and a hole are formed in the facing part of the plate and the main body to face each other with a certain gap in the horizontal direction, and a hole is formed around the boss part. 1. A load cell weigher, characterized in that a protrusion formed around the hole and a protrusion formed around the hole are vertically positioned and facing each other with a certain gap therebetween.