KR20110066655A - Measurement device of weight - Google Patents

Measurement device of weight Download PDF

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Publication number
KR20110066655A
KR20110066655A KR1020090123398A KR20090123398A KR20110066655A KR 20110066655 A KR20110066655 A KR 20110066655A KR 1020090123398 A KR1020090123398 A KR 1020090123398A KR 20090123398 A KR20090123398 A KR 20090123398A KR 20110066655 A KR20110066655 A KR 20110066655A
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KR
South Korea
Prior art keywords
load
sensor
load cell
base
support
Prior art date
Application number
KR1020090123398A
Other languages
Korean (ko)
Inventor
김영수
Original Assignee
주식회사 큐리오텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 큐리오텍 filed Critical 주식회사 큐리오텍
Priority to KR1020090123398A priority Critical patent/KR20110066655A/en
Publication of KR20110066655A publication Critical patent/KR20110066655A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/23—Support or suspension of weighing platforms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezoelectric or piezoresistive properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

The present invention relates to a weighing apparatus, more specifically, a base; A rod-shaped sensor unit which extends in a lateral direction from one side to the other side and deforms downward when the load is applied to the other side and generates an electrical signal proportional to the deformation amount, and extends in the lateral direction from one side to the other side It has a rod shape, which is disposed below the sensor part so as to face the sensor part, the bottom surface is connected to the support part in contact with the upper surface of the base, one side of the sensor part and one side of the support part, respectively, the other side of the sensor part A load cell including a connection part allowing the sensor part to be deformed by a distance from the support part by a predetermined distance; An upper plate positioned above the load cell and subjected to a load by a measurement object positioned above the load cell; And a load ball disposed between the upper plate and the sensor unit to transfer the load applied to the upper plate to the other side of the sensor unit, wherein the connection unit is integrally connected to the sensor unit and the support unit. It is about a weighing apparatus.

Description

Weight measuring device {Measurement device of weight}

The present invention relates to a weighing apparatus, and more particularly, to a weighing apparatus in which sensor characteristics are not degraded because the surface of the base in contact with the load cell does not settle even if the weight is repeatedly measured.

A weighing device is used for a scale for weighing an object to be weighed. That is, the weighing scale supports each of four to eight places on the lower surface of the upper plate on which various weighing objects such as automobiles and animals can be placed, and an electric signal proportional to the load applied when a load is applied. And a display device for calculating and displaying the weight of the weighed object by using the weighing device for generating the weight and the electrical signal generated from the weighing device.

Such a conventional weighing apparatus 100, with reference to Figure 1 showing a schematic cross-sectional view thereof, the base 110; The connection portion 122 is installed on the base 110 in an upright position and fixed by the fixing bolt 150, and one side thereof is integrally connected to the upper portion of the connection portion 122, and is laterally passed from one side to the other side. A load cell 120 having a rod shape extending in a direction but including a rod-shaped sensor unit 121 that elastically deforms the other side and generates an electrical signal proportional to the amount of deformation when a load is applied from above; The upper plate 130 and the load applied to the upper plate 130 and the load applied to the upper plate 130 are placed above the sensor 120 of the load cell 120. The load plate 140 is installed between the upper plate 130 and the sensor unit 121 of the load cell 120 to be transmitted to the side.

Here, the load cell 120 has a form of “A” as a whole, and the sensor unit 121 of the load cell 120 is spaced apart from the base 110 so that the other side thereof may be elastically deformed and sag by load.

According to this configuration, the load is transmitted to the upper surface of the sensor unit 121 of the load cell 120 by the load ball 140, as shown in Figure 2 other sensor unit 120 of the load cell 120 The side is elastically deformed and sag in a direction close to the base 110. At this time, the center portion of the sensor portion 121 of the load cell 120, a hole-shaped receiving portion 121a is formed, and the deformation of the sensor portion 121 is sensed on the inner wall surface of the receiving portion 121a and is proportional to the amount of deformation. A plurality of strain gauges (not shown) for generating electrical signals are provided.

Accordingly, in the conventional weighing apparatus 100 having the above-described configuration, when a load due to the weight of the weighed object is applied to the upper plate 130, the load is loaded through the load ball 140. It acts on the other side of the sensor unit 121 of the 120. Then, one side of the sensor unit 121 of the load cell 120 is integrally connected to the connecting portion 122 fixed to the base 110, and the other side of the sensor unit 121 of the load cell 120 forms a free end. Since the other side of the sensor unit 121 of the load cell 120, the deformation sag down in proportion to the magnitude of the load occurs. At this time, the deformation is output as an electrical signal by a plurality of strain gauges.

Such a conventional weighing apparatus 100, as the load is continuously applied, the contact portion of the connecting portion 122 and the base 110 (see the enlarged view of Figure 2), in particular the sensor portion of the load cell 120 ( Deformation occurs in a portion located directly below one side of 121). In particular, the upper surface of the base 110 is continuously settled by the pressing of the connecting portion 122, accordingly the boundary condition of the sensor is changed, the degradation of the original characteristics of the sensor occurs, which is the first set There is a problem that the measurement value must be changed.

The present invention has been made to solve the above-mentioned problems, and even if the weight of the weighed object is repeatedly measured, the base contacting the load cell does not settle, the boundary condition of the sensor does not change, and the initially set measurement value is constant. It is an object of the present invention to provide a weighing apparatus that can be maintained.

Weighing apparatus using a rod-shaped sensor unit according to the present invention for achieving the above object, the base;

A rod-shaped sensor unit which extends in the lateral direction from one side to the other side and generates an electric signal proportional to the deformation while the other side is deformed downward when a load is applied to the other side;

A support having a rod shape extending in a lateral direction from one side to the other side and disposed below the sensor portion so as to face the sensor portion, and having a lower surface thereof in contact with an upper surface of the base;

A load cell connected to one side of the sensor part and one side of the support part, the load cell including a connection part allowing the other side of the sensor part to be spaced apart from the support part by a predetermined distance or more;

An upper plate positioned above the load cell and subjected to a load by a measurement object positioned above the load cell; And

Is provided between the upper plate and the sensor portion of the load cell is provided with a load ball for transferring the load applied to the upper plate to the other side of the sensor portion,

The connection part is integrally connected with the sensor part and the support part.

In the weighing device,

Preferably, the load cell has a "c" shape.

In the weighing device,

The load cell may be fixedly coupled to the base by a first bolt through which the connection part is connected to the base and a second bolt that is connected to the base through the support part.

In the weighing device,

It is preferable that the other side of the support portion is formed to extend longer in the lateral direction than the other side of the sensor portion.

In the weighing device,

The second bolt,

It is preferable that the other side of the support penetrates a portion extending from the other side of the sensor unit.

In the weighing apparatus according to the present invention, since the load cell is generally formed in a "c" shape and the load cell is mounted on the base, even if the weight is repeatedly measured, no settlement occurs on the upper surface of the base and the boundary condition of the sensor is maintained. It does not change and has the effect of keeping the initially set measurement constant.

Hereinafter, with reference to the accompanying drawings, a weighing apparatus according to a preferred embodiment of the present invention will be described as follows.

The invention according to the present embodiment relates to a platform type weighing apparatus capable of measuring the weight of various types of weighed objects having a flat plate. Specifically, the present invention relates to a weighing device capable of measuring the weight of various raw materials, finished products, and animals, and the like, and as shown in FIGS. 3 and 4, the weighing device 1 includes a base 10. ), The load cell 20, the top plate 30 and the load ball 40.

The base 10 is installed on the ground by a predetermined fixing means and performs a function of supporting the load cell. The base 10 preferably has a rectangular parallelepiped shape as a whole, but is not limited thereto and may have various structural shapes.

The load cell 20 is mounted on the base 10 to be deformed by the load applied from the upper plate and generates an electrical signal proportional to the amount of deformation, and the sensor unit 21, the support unit 22, and the connection unit 23. )

The sensor portion 21 is elastically deformed when a load is applied to the center of the upper surface thereof, and generates an electric signal proportional to the amount of deformation, and has a rod shape as a whole. Specifically, it has a rod shape extending from one side toward the other side, and the other side thereof can be deformed downward by forming an open end without being supported separately, and the one side is supported and fixed by the connection part 23 to be described later. To form a stage. On the other side of the upper surface of the sensor portion 21 of the load cell 20, a load ball receiving portion 21b is placed on and in contact with a load ball 40 to be described later. Specifically, the load ball receiving portion 21b has an upper surface with a predetermined radius of curvature so as to accommodate the load ball, and the lower side is coupled with the other surface of the sensor unit 21 of the load cell 20.

On the other hand, the center of the sensor unit 21 of the load cell 20 is provided with a receiver 21a, and the inner wall surface is provided with a plurality of strain gauges (not shown) for measuring the deformation of the sensor unit 21, Such strain gauges, such as strain gauges, are well known and will not be described in detail. In addition, the strain measuring device is not limited to the strain gauge, and various means can be used as a matter of course.

The support part 22 has a rod shape substantially corresponding to the sensor part 21 of the load cell 20, but is disposed below the sensor part 21 so as to face the sensor part 21, and the lower surface thereof is In contact with the upper surface of the base (10). The support part 22 is spaced apart from the sensor part 21 by a predetermined distance so that the sensor part 21 of the load cell 20 is deformed when the sensor part 21 of the load cell 20 is deformed by a load. Allow to sag down.

The support portion 22 is formed to extend longer in the lateral direction than the sensor portion 21 to more securely support the load and to evenly distribute the force caused by the load to the base. In addition, the second bolt 52 penetrates the support part 22 and is connected to the base 22 at a part of the support part 22 which extends from the other side of the sensor part. The second bolt 52 performs a function of fixing the load cell 20 on the base 10.

The connection part 23 is integrally connected to one side of the sensor part 21 and one side of the support part 22, respectively. Specifically, the upper portion of the connecting portion 23 is integrally connected with one side of the sensor portion 21, and the lower portion of the connecting portion 23 is integrally connected with one side of the support portion 22, and the sensor portion 21 and The support part 22 may be maintained at a predetermined distance, thereby deforming the sensor part 21. As a result, in the present invention, the load cell 20 has an overall "c" shape, which is different from the "a" shape of the prior art. In the present embodiment, when a load is applied to the other side of the sensor portion 21 by the load cell 20 having a “c” shape and an eccentric load is applied, the lower end of the connecting portion 23 remains the base 10 as it is. Pressing does not settle the upper surface of the base 10, but is integrally connected with the support 22, it is possible to distribute the force evenly to the upper surface of the base 10 as a whole. This not only enables stable load measurement, but also has an effect that the boundary condition and the initial condition do not change even when the weight of the measured object is repeatedly measured.

Meanwhile, a cable 60 for fixing a signal detected by the strain gauge in the sensor unit 21 of the load cell 20 to the display unit (not shown) is fixedly installed at one side of the connection unit 23. On the other hand, the connecting portion 23 is fixed to the base 10 in the state that the bottom surface is in contact with the top surface of the base 10, the first bolt 51 is used for this purpose. That is, the first bolt 51 is connected to the base 10 through the connecting portion 23 to fix the connecting portion 23 to the base 10.

The upper plate 30 is positioned above the load cell 20 and is subjected to a load by a measurement object located above the load cell 20. The upper plate 30 accommodates a load ball 40 near each of four corners of the upper plate 30. The load ball cap 31 which can be provided is provided. The load ball cap 31 is to perform a function that allows the load ball 40 to be described later to be maintained at a predetermined position of the upper plate as the lower surface has a predetermined radius of curvature. On the other hand, the portion of the load ball cap 31 in contact with the load ball 40 is to form a predetermined radius of curvature.

The load ball 40 is installed between the upper plate 30 and the sensor unit 21 so as to transfer the load applied to the upper plate 30 to the sensor unit 21 of the load cell 20. The load ball 40 is spherical and is accommodated in the load ball receiving portion 21b and the load ball cap 31 formed on the other upper surface of the sensor portion 21 of the load cell 20.

Since the load ball 40 is spherical, and the contact portion located in the upper and lower portions of the load ball 40 has a spherical surface having a radius of curvature larger than the radius of curvature of the load ball 40. Even if the load acts on the load cell 20 slightly out of the load action position of the load cell 20 when the object to be measured enters or exits the top plate, the load ball is in the desired position. Can be aligned so that the load of the workpiece is applied to the desired position of the load cell 20.

Hereinafter, the operation and effects of the weighing apparatus according to the present embodiment will be described.

In the platform type weighing apparatus 1, when the weighed object is placed on the upper plate 30, the load of the weighed object is distributed into four pieces and acts on the weighing device 1, respectively.

When the load of the weighed object acts on the upper plate 30 of the weighing device 1, the load is transmitted to the load ball 40 along the load ball cap 31 provided in the lower portion of the upper plate 30. Then, the load transmitted to the load ball 40 acts on the sensor portion 21 of the load cell 20 by the load ball receiving portion 21b. Specifically, the load acts on the other side of the sensor unit 21 of the load cell 20.

When a load acts on the intended position of the load cell 20, the sensor part 21 of the load cell 20 is elastically deformed because only one side thereof is fixed by the connection part 23. That is, the other side of the sensor unit 21 of the load cell 20 is deformed while sagging downward, in which an electrical signal proportional to the amount of deformation is output to the outside. That is, the strain cage (not shown) in the receiver 21a provided at the center of the sensor unit 21 of the load cell 20 detects the deformation and outputs an accurate electrical signal. At this time, the load applied to the sensor portion 21 of the load cell 20 is evenly transmitted on the upper surface of the base through the lower surface of the connecting portion 23 and the lower surface of the support portion 22 and eventually the upper surface of the base 10 Since the force does not concentrate intensively on any part, even if the weight of the measured object is repeatedly measured, a part of the upper surface of the base 10 does not settle, and thus the boundary condition of the sensor is changed to decrease the characteristics of the sensor. Nothing happens. In addition, there is no case that the first set measurement value does not change, so there is an advantage that a constant measurement result can be obtained at all times.

On the other hand, the platform-type weighing apparatus 1 according to the present embodiment has been described that the load cell 20 is fixedly coupled to the base by the first bolt 51 and the second bolt 52, but is not limited thereto. It is also possible that the bottom and the base of the connecting portion and the support can be welded to each other and can be coupled by a variety of other fixed coupling means.

Although the present invention has been described in detail by way of examples, the present invention is not necessarily limited to these embodiments and modifications, and may be variously modified and implemented within the scope of the technical spirit of the present invention.

1 is a front view of a weighing apparatus according to the prior art.

2 is an operation of FIG.

3 is a plan view of a weighing apparatus according to a preferred embodiment of the present invention.

4 is a front view of the weighing apparatus of FIG.

5 is an operation of FIG.

<Detailed Description of Drawings>

1 ... Weighing device 10 ... Base

20 ... Load cell 21 ... Sensor

21a ... Receiving part 21b ... Load ball receiving part

22.Support 23 Connection

30.Top 31 31.Load ball cap

40.Load Ball

Claims (5)

Base; A rod-shaped sensor unit which extends in a lateral direction from one side to the other side and generates an electrical signal proportional to the amount of deformation while the other side is deformed downward when a load is applied to the other side; A support having a rod shape extending in a lateral direction from one side to the other side and disposed below the sensor portion so as to face the sensor portion, and having a lower surface thereof in contact with an upper surface of the base; A load cell connected to one side of the sensor part and one side of the support part, the load cell including a connection part allowing the other side of the sensor part to be spaced apart from the support part by a predetermined distance or more; An upper plate positioned above the load cell and subjected to a load by a measurement object positioned above the load cell; And A load ball disposed between the upper plate and the sensor unit to transfer a load applied to the upper plate to the other side of the sensor unit, The connecting unit is a weighing apparatus, characterized in that connected to the sensor unit and the support unit integrally. The method of claim 1, The load cell is a weighing apparatus, characterized in that having a "c" shape. The method of claim 1, The load cell is a weight measuring device, characterized in that the coupling is fixed on the base by a first bolt connected to the base through the connecting portion and the second bolt connected to the base through the support. The method of claim 3, wherein The other side of the support portion is a weight measuring device, characterized in that extending in the transverse direction than the other side of the sensor portion. 5. The method of claim 4, The second bolt, Weighing apparatus, characterized in that through the portion extending from the other side of the sensor portion as the other side of the support.
KR1020090123398A 2009-12-11 2009-12-11 Measurement device of weight KR20110066655A (en)

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KR1020090123398A KR20110066655A (en) 2009-12-11 2009-12-11 Measurement device of weight

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KR1020090123398A KR20110066655A (en) 2009-12-11 2009-12-11 Measurement device of weight

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107131942A (en) * 2017-01-04 2017-09-05 缤刻普锐(北京)科技有限责任公司 A kind of projection electronic weighing equipment
US10151646B2 (en) 2016-02-23 2018-12-11 i2A Systems Co., Ltd. Force sensor using displacement amplification mechanism and apparatus having the same for measuring weight
KR20200074617A (en) * 2018-12-17 2020-06-25 주식회사 알에스 Weight measuring apparatus of blade for wind power generator
KR102203631B1 (en) 2020-09-14 2021-01-15 주식회사 우람 Device for measuring weight of slide type and, apparatus for reducing food waste having the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10151646B2 (en) 2016-02-23 2018-12-11 i2A Systems Co., Ltd. Force sensor using displacement amplification mechanism and apparatus having the same for measuring weight
CN107131942A (en) * 2017-01-04 2017-09-05 缤刻普锐(北京)科技有限责任公司 A kind of projection electronic weighing equipment
KR20200074617A (en) * 2018-12-17 2020-06-25 주식회사 알에스 Weight measuring apparatus of blade for wind power generator
KR102203631B1 (en) 2020-09-14 2021-01-15 주식회사 우람 Device for measuring weight of slide type and, apparatus for reducing food waste having the same

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