JPH08481U - Multi-point weighing scale - Google Patents

Abstract

(57) [Abstract] [Purpose] To remove the influence of the deformation of the base of a multipoint weighing scale on the measurement accuracy more easily and at low cost. [Structure] When a weight sensor is attached to the base of a weighing scale, it is attached with a degree of freedom through a flexible member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic digital display weighing scale, and more particularly to a multi-point weighing scale that measures a load as a total value of outputs of a plurality of sensors.

[0002]

[Prior art]

 In recent weight scales, it is common to concentrate the load applied to the mounting table at one point and measure with one sensor, but the height is low for the size of the mounting table of the weighing scale. In the case of so-called flat type and large scales, there are problems with the measurement error due to eccentric load, the method of concentrating the load at one point, the mechanical strength of the load transmission mechanism, etc. In a weighing scale or a large weighing scale, a multi-point type is adopted in which the load is distributed and applied to a plurality of sensors, and the outputs of the sensors are summed.

In the multi-point type weighing scale, the rate at which the load is loaded on each sensor differs depending on the mounting position of the load on the mounting table, and correct measurement cannot be performed unless the output characteristics of each sensor are the same. The so-called eccentric load error is generated, and a method of mechanically or electrically making the output characteristics of each sensor unit the same is applied.

On the other hand, no matter where the load table is loaded, the weighing scale itself must be stable without tipping or tilting. For that purpose, the legs of the weighing scale, which are the supporting points of the load, are as much as possible. It is necessary to mount them separately, and the mounting intervals of the sensors are also separated.

If the legs are separated from each other, the base of the weighing scale to which the legs are attached is likely to be deformed, and the deformation of the base is not constant depending on the load amount and the load position. The fixed conditions change, and the load on the sensor acts as a force other than the vertical force, which changes the output characteristics of the sensor and affects the measurement accuracy of the weighing scale.

Therefore, as a measure for preventing the sensor from being affected even if the base is deformed, a sensor mounting base having high rigidity is provided separately from the base, or the rigidity of the base is increased to prevent the base from being deformed. Although it has been prevented, it is not possible to completely eliminate the effect on the sensor. On the other hand, this causes the weight of the weighing scale itself to be heavy, which causes an increase in manufacturing cost.

[0007]

[Problems to be solved by the device]

 An object of the present invention is to remove the influence of the deformation of the base of the multi-point weighing scale on the measurement accuracy more easily and at low cost.

[0008]

[Means for Solving the Problems]

 When attaching the weight sensor to the base of the weighing scale, attach it with flexibility through a flexible member.

[0009]

[Action]

 Since the sensor is connected to the base via a flexible member with a degree of freedom, the deformation of the base is absorbed as the deformation of the flexible material, the influence on the sensor is eliminated, and the load is stable and vertical. The force is accurately transmitted to the sensor.

[0010]

【Example】

 Hereinafter, details of the present invention will be described with reference to the drawings of an embodiment of the present invention. Fig. 1 is a perspective view showing an overview of a typical flat-type weighing machine according to the present invention. The legs are attached to the four corners of the base in order to prevent the body from tipping over and becoming unstable. It is attached to the corner of the base.

FIG. 2 is an enlarged view of the sensor unit of FIG. 1 embodiment. Since the sensor used in this embodiment is a thin weighing scale, its details are shown in the exploded view of FIG. 3, and the fixed end and the load end of the beam type load cell in which a strain gauge is bonded to the central strain section are shown. Extend toward the center, and the strain element can be deformed at a position where the stress, strain element and fixing point are on the same plane. It is fixed to a highly rigid base via a spacer.

FIG. 4 is an enlarged cross-sectional view of an attachment portion of the weight sensor to the base, and FIG. 5 is an assembly exploded view thereof. The mounting hole of the base has a flange, the inner diameter of which passes through the mounting bolt, and the length of the base is approximately + (base flange thickness + (flange thickness x 2)) and is penetrated through a spacer molded with a pipe-shaped flexible elastic material. , Tighten the base with the bolts and nuts.

Due to the tightening force, a portion of the flange of the flexible material spacer, which is approximately twice the length of the flexible material spacer, is bent, and the periphery of the mounting hole of the base is completely covered with a flexible elastic material, so that the base or weight sensor is attached to the base. It can be installed with freedom in all directions.

FIG. 6 shows another embodiment of the flexible material spacer. A flexible elastic material is sandwiched between the bolts, and the bolts are arranged one above the other.

FIG. 7 shows another embodiment of a flexible material spacer, in which a block of a flexible elastic material is bonded between a base and a base with an adhesive.

[0016]

[Effect of device]

 Since a flexible elastic spacer is interposed between the sensor and the base, the deformation of the base is not transmitted to the sensor and a great effect can be obtained at a small cost, providing a highly accurate flat scale. You can

[Brief description of drawings]

FIG. 1 is a perspective view of a flat weighing machine to which the present invention is applied.

FIG. 2 is an overall view of essential parts of an embodiment of the present invention.

FIG. 3 is an exploded view of a sensor unit used in an embodiment of the present invention.

FIG. 4 is an enlarged sectional view of an embodiment of the present invention.

FIG. 5 is an exploded view of an essential part of the embodiment of the present invention.

FIG. 6 is a sectional view showing the main part of another embodiment of the present invention.

FIG. 7 is a sectional view showing the main part of another embodiment of the present invention.

[Explanation of symbols]

 1 Cover 2 Base 3 Sensor 4 Leg 5 Strain Gage 6 Strain Gauge 7 Bolt 8 Nut 9 Washer 10 Flexible Material Spacer 11 Base 12 Adhesive 13 Spacer 14 Focus 15 Assembly Screw 16 Fixing Screw

Claims (1)

[Scope of utility model registration request] 1. A multi-point type weighing scale characterized in that a weight sensor is attached to a base of the weighing scale with a degree of freedom through a flexible member.