JPS6150012A - Multiple-range load cell scale - Google Patents

Abstract

PURPOSE:To make it possible to measure light material and heavy material in a broad range highly accurately, by simultaneously applying loads on a high measuring load cell and a low measuring load cell having the different measuring ranges. CONSTITUTION:When a load is applied on a receiving pan, both a low measuring L/C4 and a high measuring L/C3 receive strain, and electric signals are independently sent out. The two kinds of the electric signals are amplifiers by amplifiers 20. The signals in analog states are converted into digital signals by ADCs 21. The digital signals are independently sent to a microcomputer 22. Based on the data in the microcomputer 22, which of the signals from the high measuring L/C3 or the lower measuring L/C4 should be adopted is determined in correspondence with the magnitude of the load. Then the measured result is displayed on a display part 18.

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 displayed digit according to the magnitude of 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 magnitude of the load. If such a scale itself has a weighing capacity of 1 g to 30 k and a 4-digit display function, for example,
g~2, less than 5k is displayed in 1g units, 2.5k
The weight between 30g and 30kg is displayed in tog units. So, now let's assume that the measured value is 1.5 k.

If it is 1500 (g) - 15 kg, it will be displayed as 1500 (X10 g). For this reason, load cells used in such devices are required to have a wide range of weighing capacity from 1 g to 30 kg. However, with normal load cells, the range in which accurate measurements can be made is narrow, and the wider the range, the greater the error, so in order to cover a wide range, extremely high-precision load cells must be used. This requires the use of an expensive load cell itself, and furthermore, even if an expensive and highly accurate load cell is used, there is a drawback that adjustment is required for each range.

Purpose of the Invention The present invention was made in view of the above points, and it is an object of the present invention to create a multi-range load cell cup that can perform highly accurate weighing over a wide range even if an inexpensive load cell is used. purpose.

The present invention connects one end of a high weight load cell corresponding to a heavy object and a low weight load cell corresponding to a light weight object by a connecting part, and connects two ends in the opposite direction to this connecting part. Since the fixed part is fixed to the base and the load receiving part is fixed to the saucer, by using +M load cells with different measurement ranges, high precision measurement can be performed over a wide range even if an inexpensive load cell is used. It was planted so that it could be done.

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 with a bottom opening as a base 1 is provided, and inside this case 2 is a hard high-basis load cell 3 (hereinafter referred to as high-basis L/C) that has a small amount of distortion against the load corresponding to a heavy object. ) and a soft low-basis load cell 4 (hereinafter referred to as low-basis L/C) that has a large amount of strain against the load corresponding to a lightweight object.
) is provided. These high scale iL/C3
and low weight/C4, the ends in the same direction become connecting parts 5, and these connecting parts 5 are connected via a spacer 6,
The whole has a U-shape with the low basis weight L/C4 facing upward. The end of the high-basis L/C 3 in the opposite direction from the connecting part 5 becomes a fixing part 7, and this fixing part 7 is fixed on the base 1 via a spacer 8. In addition, a portion slightly closer to the center than the end opposite to the connecting portion 5 of the other class m L/C4 becomes a load receiving portion 9, and this load receiving portion 9
A saucer 11 is fixed to the plate 11 with a spacer 10 interposed therebetween.

This saucer 11 is a tray plate 1 located on the upper surface of the case 2.
2 and a frame 13 connected to the plate plate 12 and existing inside the case 2, and this frame 13 is directly fixed to the load receiving part 9. In addition, the above-mentioned high basis weight L/C
3. The low weighing L/C4 and the saucer 1F are all held in a horizontal state.

The base 1 is provided with four rod-shaped plate supports 1 - flange 14 that face the four corners of the frame 13 in a non-contact state.
is prominently provided. Further, a plate-shaped second stopper 1 faces the connecting portion 5 of the high basis weight L/C 4 in a non-contact state.
5 or the base 1, the charge receiving part 9 of the low basis weight L/C4
A plate-shaped first flange 16 facing in a non-contact state with the farthest end of the side is protrudingly provided at the farthest end of the front"2 high weighing capacity L/C3. Note that these saucers The stopper 14, the second stopper 15, and the first stopper 16 are used to prevent damage when an excessive load is applied.

Furthermore, a display surface 17 is formed on one side of the case 2,
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 the high weighing capacity L/C3 and low weighing capacity L/C4, and this connection state is shown in FIG. 3. That is, Takaba RL
/ C3 and other departments m L / C4 are independently equipped with an amplifier 20 and an analog-to-digital converter 21 (hereinafter referred to as AD
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 weighing object is weighed by placing the weighing object on the plate plate 12, and the low weighing amount L/C4 and the high weighing amount L/C4 are determined depending on the magnitude of the load at that time. Use C3' properly.

That is, the low basis weight L/C4 has the characteristic that an accurate measured value can be obtained under a low load, and the high basis weight L/C3 has the characteristic that an accurate measured value can be obtained under a high load.

Therefore, which load cell to use is selected depending on the magnitude of the load. In the weighing process at this time, when a load is applied to the saucer 11, both the low weight L/C4 and the high weight L/C3 are distorted, and each generates an electric signal independently. Therefore, the two types of electrical signals are amplified by each amplifier 20, and the analog state signal is
The signal is digitally converted at C21 and sent independently to the mital computer 22. Here, microcomputer 2
According to the information in 2, high basis weight L/C3 and low basis weight L/C4
It is determined which of the signals to be applied according to the magnitude of the load, and thereafter, the 3-1 amount result is displayed on the display section 18. The display on the display section 18 is based on information from the microcomputer 22, and the digits of the displayed values are automatically converted according to the magnitude of the load. Note that the standard for the 0 display output at this time is the highly accurate weighing value of low weighing L/C4, and when using the weighing value of high weighing iL/C3, this M weighing L/c3 is used. and low weighing L/C4
A comparison calculation is made between the values and the measured value at the high weighing amount L/C3 is converted and displayed. Thereby, highly accurate measured values can be obtained.

As described above, according to this embodiment, high weighing L/C3 and low weighing L/C3 and low weighing L/C3 and low weighing L/C3 have different specific ranges for accurate weighing.
Two types of C4 load cells are used, and a load is applied to these two types of load cells simultaneously to measure the load within a range specific to each type. Therefore, even if an inexpensive load cell is used for each load cell itself, highly accurate measurement can be performed over a wide range, and multi-range display can be performed based on the measurement results.

In addition, in implementation, the positions of the high basis weight L/C3 and the low basis weight L/C4 may be exchanged, and both may be arranged in parallel or in a straight line.

Further, in the above embodiment, an example using two load cells has been described, but three or more load cells having different measurement ranges may be used. Furthermore, the high scale fl:L/C3 and the other scale m L/C4, which are connected to form a U-shape, may be integrally formed.

Effects of the Invention As described above, the present invention enables a wide range of weighing from light to heavy objects to be carried out with high precision by simultaneously applying a load to a high weighing load cell and a low weighing load cell having different weighing ranges. The cost of the load cell itself can be kept extremely low while maintaining high accuracy over a long period of time, and therefore a device with excellent cost performance can be provided at a low price.

[Brief explanation of drawings]

FIG. 1 is an overall longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a side view of its emblem, and FIG. 3 is a block diagram showing the overall configuration. 1... Base, 3... High weighing load cell, 4...
Low weighing load cell, 5... Connecting part, 7... Fixed part,
9...Load receiving part, 11...Saucer

Claims (1)

[Claims] A high-basis load cell corresponding to heavy objects and a low-basis load cell corresponding to light objects are provided, one end of these high-basis load cell and low-basis load cell are connected by a connecting part, and two ends in the opposite direction to this connecting part are connected. A multi-range load cell scale characterized in that a fixed part is fixed to a base and a load receiving part is fixed to a saucer.