JPH056650B2 - - Google Patents

Description

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

TECHNICAL BACKGROUND AND PROBLEMS OF THE INVENTION Conventionally, there are multi-range load cell scales that change the displayed value depending on the magnitude of the load. For such items, the scale itself weighs between 1g and 30Kg.
If it has a weighing capacity of up to 100 kg and a 4-digit display function, for example, 0 kg to less than 2.5 kg is displayed in 1 g units, and 2.5 kg to 30 kg or less is displayed in 10 g units. To give a specific example, if the measured value is
If the weight is 1.5 kg, it will be displayed as 1500 (g), and if it is 15 kg, it will be displayed as 1500 (10 g). Therefore, load cells used in such devices are required to have a weighing capacity over a wide range of 1 g to 30 kg.
However, a load cell has a range unique to the load cell in which high-accuracy measurement can be performed, and the measurement accuracy in a range other than the specific range is poor. Therefore, by using a high-performance load cell that can perform highly accurate calculations over a relatively wide range, it is possible to perform highly accurate weighing over a wide range, but in this case, an expensive load cell must be used. . Moreover, even such an expensive load cell has a drawback that the range in which highly accurate measurement can be performed is limited, and the wider the measurement range, the less accurate it is.

Purpose of the Invention The present invention was made in view of the above points, and an object 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.

SUMMARY OF THE INVENTION The present invention provides a high-basis load cell with one end fixed to a base, a low-basis load cell with one end connected to a high-load receiver located at the other end of the high-basis load cell, The saucer is connected to the low-load receiver located at the other end via a magnetic connection part that breaks the connection when the load exceeds a predetermined load, and the high-load frame that receives the saucer that is disconnected from the low-load receiver is elevated. Since it is fixed to the load receiver side, it is possible to carry out highly accurate measurement over a wide range even if an inexpensive load cell is used, and the structure is such that the device can be maintained from excessive loads. .

Embodiment of the Invention An embodiment of the present invention will be described based on FIGS. 1 to 3. A housing-like case 2 whose bottom plate serves as a base 1 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 1 through a spacer 4 in the case 2.
Fixed on 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 8 is attached to the lower surface of the low load receiving portion 8 at the other end of the low weight L/C 6 that is not connected.
is fixed. 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 tray 12 formed by integrating a tray plate 10 existing outside the case 2 and a frame 11 existing inside the case 2 is disposed above the low basis weight L/C 6. Further, on the lower surface of the frame 11 of the saucer 12, there is a connecting arm 13 that surrounds the low load receiving portion 8 and is magnetically connected to the magnet 9.
are fixed, and these connecting arms 13 and magnets 9 form a magnetic connecting section 14. Then, by this magnetic connection part 14, the saucer 1
2 is magnetically connected to the low load receiving portion 8. 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
extends in the direction of the saucer 12 and faces the lower end of the saucer 12 in a non-contact state, and prevents the saucer 12 from falling when the connection between the magnet 9 and the connecting arm 13 is broken. High load frame 1
It is configured to be held in contact with 5.
Note that the high basis weight L/C3, the low basis weight L/C6, and the saucer 12 are all held in a horizontal state.

Therefore, a stopper 16 protruding from the base is provided for the high-basis L/C 3 and the saucer 12 to prevent damage to the device when an excessive load is applied.

Next, a display surface 17 is formed on one surface of the case 1, and a display section 18 and a numeric keypad 19 are arranged on this display surface 17. These display sections 18
and the numeric keypad 19 are connected to the high weighing capacity L/C3 and the low weighing capacity L/C6, and this connection state is
As shown in the figure. That is, an independent amplifier 20 and an analog-to-digital converter 21 (hereinafter referred to as ADC) are connected to the high-basis L/C 3 and low-basis L/C 6, and these ADCs 21 are connected to a microcomputer 22. . A display section 18 and a numeric keypad 19 are connected to this microcomputer 22.

In such a configuration, the high-basis L/C3 has characteristics that allow highly accurate weighing under high loads,
The low weighing capacity L/C6 has the characteristic of being able to perform highly accurate weighing under low loads. However, the measurement is done on the saucer 12.
This is done by placing the object to be weighed on and applying a load to the low weighing capacity L/C6 and the high weighing capacity L/C3. At this time, if a load of more than a predetermined value is applied to the tray 12, the magnetic connection between the magnet 9 and the connecting arm 13 is broken, and the tray 12 falls onto the high-load frame 15. Thereby, the low basis weight L/C6 made of a soft elastic body 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.
Further, when the load on the saucer 12 is removed, the connecting arm 13 is magnetically attracted to the magnet 9 again, 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, a high weighing capacity L/
C3 and low basis weight L/C6 are distorted and output the amount of distortion as an electrical signal. Note that after the saucer 12 falls off, an electrical signal is output only from the high basis weight L/C3.
Here, the transmission process of each electric signal is shown in FIG. In addition, high basis weight L/C3 and low basis weight L/C
Electrical signals independently outputted by each of the amplifiers 20 are amplified by the respective amplifiers 20, converted into digital signals by the ADC 21, and then 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 weighing results of the selected load cells are displayed on the display 18.
will be displayed. 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, and thereby 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, it is possible to perform highly accurate measurements over a wide range. Therefore, even if each load cell itself is inexpensive, highly accurate measurement can be performed over a wide range. Furthermore, when an overload is applied to the low-basis L/C 6, the saucer 12 falls off, allowing maintenance of the low-basis L/C6 main body.

Effects of the Invention As described above, the present invention applies a load to a high-basis load cell and a low-basis load cell at the same time, and weighs 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 applied only to the high-weighing load cell, making it easier to use the low-weighing load cell. can be maintained from destruction due to overload and therefore
This has advantages such as being able 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. 1... Base, 3... High weighing load cell, 5...
...High load receiver, 6...Low weighing load cell, 8...
Low load receiving part, 12... saucer, 14... magnetic coupling part, 15... high load frame.

Claims (1)

[Claims] 1 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 the low-basis load cell is located at the other end of the low-basis load cell. A saucer is connected to the low load receiver via a magnetic coupling part that disconnects when the load exceeds a predetermined load, and the high load frame that receives the saucer disconnected from the low load receiver is connected to the high load receiver. A multi-range load cell scale that is fixed on the side.