JPS6151525A - Multirange load cell balance - Google Patents

Abstract

PURPOSE:To reduce the cost and to obtain high precision over a wide range by coupling one terminal of a low-balancing-quantity load cell with the high load receiving part at one terminal of a high-balancing-quantity load cell fixed at the other terminal to a base and fixing a high load frame which receives a counter pan coupled with its other terminal to the high load receiving part side. CONSTITUTION:One terminal of the high-balancing-quantity load cell 3 is fixed to the base 1 of a case 2, and one terminal of the low-balancing-quantity load cell 6 is coupled with on the high load receiving part 5 at the other terminal of the load cell 3 through a spacer 7; and a magnet 9 is fixed to the reverse surface of the low load receiving part 8 at the other terminal, and the counter pan 12 consisting of an external frame 11 and a pan plate 10 in the case 2 in one body is arranged above the cell 6. Further, a coupling arm 13 coupled magnetically with a magnet 9 while covering the receiving part 8 is fixed to the reverse surface of a frame 11 and the pan 12 is coupled magnetically with the receiving part 8; and the high load frame 15 projected from the spacer 7 in four directions is opposed to the reverse surface of the pan 12 without contacting and a body to be measured is placed on the pan 12. Then, a light body is measured by the cell 6 and a heavy body is measured by the cell 3 respectively, so that the measured values are displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a multi-range load cell scale that changes a displayed value N3 according to the magnitude of a load.

Technical Background and Problems of the Invention Conventionally, there are multi-range load cell scales that change the digit of the displayed value depending on the size of the load, but the scale itself can weigh between 1g and 30kg. Assuming that it has a capacity and a 4-digit display function, for example, Okg~
2. Less than 5 kg is displayed in Ig units, and 2.5 kg or more and 30 kg or less is displayed in tog units. To give a specific example, if the weight is 1.5 kg.

If the weight is 1500 (g) - 115 kg, it will be displayed as 1500 (10 g). Therefore, a load cell used in such a device is required to have a measuring capability over a wide range from Ig to 30kc.

However, the load cell has a range unique to the load cell in which highly accurate measurement can be performed, and the measurement accuracy in a range other than the specific range is poor.

Therefore, if a high-performance load cell with a relatively wide range is used, it is possible to perform high-precision measurement over a wide range, but in this case, an expensive load cell must be used. However, even with such an expensive load cell, the range in which highly accurate measurement can be performed is limited.

It has the disadvantage that the wider the measurement range, the less accurate it is.

purpose of invention The present invention was made in view of these points.

The purpose of the present invention is to obtain a multi-range load cell scale that can perform highly accurate weighing over a wide range using an inexpensive load cell.

1. Summary of the Invention The present invention provides a high-basis load cell having one end fixed to a base, and a low-basis load cell having one end connected to a high-load receiver located at the other end of the high-basis load cell. The other end of the weighing load cell 1: A saucer is connected to the low load receiving part via a magnetic connection part that breaks the connection when the load exceeds a predetermined load, and a high load is used to receive the saucer which is disconnected from the low load receiving part. Since the frame is fixed to the high-load receiver side, high-precision measurement can be performed over a wide range even if an inexpensive load cell is used, and the system is designed to prevent maintenance from excessive loads. be.

Embodiment of the Invention An embodiment of the present invention will be described with reference to FIGS. 1 to 3. A housing-like case 2 whose bottom is a base L is provided, and one end of a high-basis load cell 3 (hereinafter referred to as high-basis L/C) corresponding to heavy objects is connected to the base via a spacer 4 in the case 2. A fixed skewer is attached to the top. Furthermore, one end of a low-basis load cell 6 (hereinafter referred to as low-basis L/C) corresponding to lightweight objects is connected to the upper surface of the high-load receiving portion 5 at the other end of the high-basis L/C 3 in a U-shape via a connecting spacer 7. connected to the type. A magnet 9 is fixed to the lower surface of the low load receiving portion 8 at the other end of the low basis weight L/C 6 that is not connected.

Note that the high basis weight L/C3 is formed of a hard material that has a small amount of strain with respect to the load, and the low basis weight L/C6 is formed of a soft material that has a large amount of strain. On the other hand, a saucer 12 formed by integrating a tray plate 1o existing outside the case 2 and a frame 11 existing inside the case 2 is disposed above the low basis weight L/C 6. Furthermore, a connecting arm 13 that surrounds the low-load receiving portion 8 and is magnetically connected to the magnet 9 is fixed to the lower surface of the frame 11 of the saucer 12. A connecting portion 14 is formed. The receiving tray 1.12 is magnetically connected to the low load receiving portion 8 by this magnetic connecting portion 14. Furthermore, four plate-shaped high-load frames 15 protruding in all directions from the connecting spacer 7 are arranged in a cross shape. These high-load frames 15.

It extends in the direction of the saucer 12 and faces the lower end of the saucer 12 in a non-contact state, and the saucer 12 that falls when the connection between the magnet 9 and the connecting arm 13 is broken is subject to a high load. It is configured to be held in contact with the frame 15. Note that the high basis weight L/C: 3, the low basis weight L/C6, and the saucer 12 are all held in a horizontal state.

However, for the highly rated ff1L/C3 and saucer 12, -
A stopper 16 is provided that protrudes from above the base 1 to prevent damage to the device when an excessive load is applied.

Next, a display surface 17 is formed on one side of the case 1,
A display section 18 and a numeric keypad 19 are arranged on the display surface 17. These display section 18 and numeric keypad 19 are
Connected to high weighing capacity L/C3 and low weighing capacity L/C6,
This connection state is shown in FIG.
An amplifier 20 and an analog-to-digital converter 21 (hereinafter referred to as ADC) are independently connected to the L/C 3 and the low weighing L/C 6, and these ADCs 21 are connected to a microcomputer 22. The microcomputer 22 is connected to a display unit 18 and a numeric keypad 19, and the high-weighing L/C 3 has the characteristic of being able to perform highly accurate weighing under high loads. L/C6 has the characteristic of being able to perform highly accurate measurement under low loads. Therefore, weighing is performed by placing the object to be weighed on the saucer 12 and
This is done by applying a load to /C6 and high basis weight L/C3. At this time, if a load of a predetermined value or more is applied to the saucer 12, the magnetic connection between the magnet 9 and the connecting arm 13 is broken, and the saucer 12 falls onto the high-load frame 15. As a result, the low scale ff1L/C made of a soft elastic body
6 can be maintained from destruction due to overload. Then, the load applied to the fallen saucer 12 is applied only to the high basis weight L/C3 via the high-load frame 15 with which the saucer 12 comes into contact.

Also, when the load on the saucer 12 is removed, the connecting arm 13
is again magnetically attracted to the magnet 9, and the connection of the saucer 12 to the low basis weight L/C6 is maintained.

On the other hand, when a load is applied, the high weight /C3 and the low weight L/C6 are distorted, and the amount of distortion is output as an electric signal. Incidentally, after the saucer 12 falls, an electric signal is output only from the high-basis L/C3.

Here, the transmission process of each electric signal is shown in FIG. Note that the electrical signals independently output by the high-basis L/C 3 and the low-basis L/C 6 are amplified by the respective amplifiers 20,
After being digitally converted by the ADC 21, the signals are sent separately to the microcomputer 22. Here, depending on the information in the microcomputer 22, it is selected which of the signals from the high-basis L/C3 and the low-basis L/C6 is to be adopted. This selection is performed by comparing and calculating the characteristics of the two load cells, and after selection, the measurement results for the selected load cells are displayed on the display section 18.

In addition, in this display, the digits of the displayed value are automatically converted according to the magnitude of the load based on information from the microcomputer 22, so that a multi-range display can be performed.

As described above, according to this embodiment, by using two types of load cells with different ranges capable of performing highly accurate measurements, highly accurate measurements can be performed over a wide range. Therefore, even if an inexpensive load cell is used for each load cell itself, highly accurate measurement can be performed over a wide range. Furthermore, when an overload is applied to the low-basis L/C6, the saucer 12 falls off, allowing maintenance of the low-basis iL/C6 main body.

Effects of the Invention As mentioned above, in the present invention, a load is applied to a high-basis load cell and a low-basis load cell at the same time, and weighing is performed in a range according to the characteristics of each, so even if an inexpensive load cell is used. Highly accurate weighing over a wide range is possible, and when an overload is applied to the low weighing L/C, the saucer falls off and the load is exclusively applied to the high weighing load cell, so it is possible to avoid overloading the low weighing load cell. Therefore, it is possible to provide a device with excellent cost performance and safety at a low cost.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional side view thereof, and FIG. 3 is a block diagram showing the overall configuration. l...Base, 3...High weighing load cell, 5...
High load receiver, 6...Low weighing load cell, 8...Low load receiver, 12...Saucer, 14...Magnetic connection part, 1
5...High load frame

Claims (1)

[Claims] A high-basis load cell is provided with one end fixed to the base, a low-basis load cell is provided with one end connected to a high-load receiver located at the other end of the high-basis load cell, and a A saucer is connected to the load receptor through a magnetic coupling part that disconnects when the load exceeds a predetermined load, and the high load frame that receives the saucer, which is disconnected from the low load receptor, is placed on the side of the high load receptor. A multi-range load cell scale that is fixed to.