WO2000075617A1 - Capteur de force - Google Patents

Capteur de force Download PDF

Info

Publication number
WO2000075617A1
WO2000075617A1 PCT/JP2000/003126 JP0003126W WO0075617A1 WO 2000075617 A1 WO2000075617 A1 WO 2000075617A1 JP 0003126 W JP0003126 W JP 0003126W WO 0075617 A1 WO0075617 A1 WO 0075617A1
Authority
WO
WIPO (PCT)
Prior art keywords
load
receiving portion
load cell
core
cell
Prior art date
Application number
PCT/JP2000/003126
Other languages
English (en)
Japanese (ja)
Inventor
Kazuaki Hama
Fumiya Kobayashi
Original Assignee
Kabushiki Kaisha Bridgestone
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 Kabushiki Kaisha Bridgestone filed Critical Kabushiki Kaisha Bridgestone
Publication of WO2000075617A1 publication Critical patent/WO2000075617A1/fr

Links

Classifications

    • 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
    • G01G3/141—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc or ring shaped
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction

Definitions

  • the present invention relates to a structure of a load cell used for a platform weigher, a tank, a material supply hopper, a truck bed, or the like, and detects a deformation due to a load using a strain gauge.
  • FIG. 15 (a) is a plan view showing the configuration of a platform scale 20 used for measuring the weight of a truck described in, for example, Japanese Patent Application Laid-Open No. 7-77457, and FIG. ) Is a longitudinal sectional view showing a mounting state of a laminated rubber 24 which is a load cell protection member of the platform scale 20.
  • the load cell 23 is fixed to the lower mounting base 21 with bolts 22, and the truck is mounted on the load receiving portion 23 A of the load cell 23 via the laminated rubber 24.
  • the weight of the truck mounted on the upper surface of the upper frame 25.
  • FIG. 16 is a diagram showing the configuration of a platform scale 30 described in Japanese Patent Application Publication No. Hei 8-159589, which is composed of a top surface of a load cell 23 and an upper frame.
  • a highly rigid spherical or barrel-shaped member provided between two plate-like members 31 and 32 fixed to the lower surface of the member 25 in contact with the plate-like members 31 and 32, respectively.
  • spheroidal A load cell protection member 35 comprising a vertical load supporting member 35 A having a shape and an elastic body 35 B enclosing the vertical load supporting member 35 A is provided.
  • the load cell 23 has a horizontal force. When the vertical load supporting member 35A rolls, the unnecessary force is absorbed by the vertical load supporting member 35A, and the load cell 23 is not directly subjected to the horizontal or tilting force. It is like that.
  • the strength of the laminated rubber 24, which is a protective member, is maintained by the adhesive force between the elastic body 24 A and the metal plate 24 B. There were problems such as low strength and poor reliability.
  • the present invention has been made in view of the conventional problems, and accurately transmits a vertical load acting on a load cell to a strain body without increasing the thickness of the load cell itself.
  • An object of the present invention is to effectively protect a load cell against a force and a tilting load, and to improve measurement accuracy and strength reliability of a mouth cell. Disclosure of the invention
  • a mouthpiece includes: a load receiving portion that receives a load from a load table on which an object to be weighed is mounted; and a strain body having strain detecting means and deformed by a load applied to the load receiving portion.
  • a joint member comprising a core having a joint with a load table and an elastic body formed so as to surround the core; And a load receiving portion main body joined thereto.
  • the joint portion is constituted by a member provided with a female screw or a through hole, or a member having a male screw projecting from the core to the load table side. Further, in the present invention, a through hole is formed in the load receiving portion main body, and the joining member is inserted into the through hole.
  • the outer dimensions of the core portion on the side opposite to the load table are formed larger than the external dimensions of the load table side.
  • a concave portion is formed in the load receiving portion main body, and the joining member is inserted into the concave portion.
  • FIG. 4 is a diagram showing a configuration of a holder according to Best Mode 1.
  • FIG. 5 is a diagram showing another configuration of the holder according to the first embodiment.
  • FIG. 6 is a diagram showing another configuration of the holder according to the first embodiment.
  • FIG. 7 is a diagram showing another configuration of the holder according to the first embodiment.
  • FIG. 8 is a diagram showing another configuration of the holder according to the first embodiment.
  • FIG. 9 is a view showing another configuration of the holder according to the first embodiment.
  • FIG. 10 is a schematic diagram of a platform weigher according to a second preferred embodiment of the present invention.
  • FIG. 11 is a diagram showing a configuration of a load cell according to the second embodiment.
  • FIG. 12 is a diagram showing a configuration of a load cell according to the third embodiment.
  • FIG. 13 is a schematic view of a platform weigher according to Best Mode 3.
  • FIG. 14 is a diagram showing a state of a load receiving portion when one load cell is used.
  • FIG. 15 is a diagram showing a configuration of a conventional load cell.
  • the load cell 1 has a cylindrical load receiving portion 2 for receiving a load from a load table 11 on which an object to be weighed is mounted, and the outer periphery of the load receiving portion 2
  • a thin frame-shaped strain-generating body 3 which is formed integrally with the load-receiving part 2 and is deformed by the load applied to the load-receiving part 2;
  • It is composed of a load section 2 and a peripheral frame 5 joined thereto.
  • the strain body 3 is fixed to the peripheral frame 5 at a joint portion on an outer peripheral side thereof, and is fixed to the load receiving portion 2 at a joint portion on an inner peripheral side thereof. It has an annular plate-like structure.
  • Reference numeral 6 denotes a fixing screw hole for fixing the load cell 1 to the mounting base 12.
  • Reference numeral 7 denotes a drawer provided on the side surface of the peripheral frame 5 for drawing out a measurement cable from the measurement terminal of each of the strain gauges 4a and 4b to the outside of the load cell 1. Connected to a distortion detection circuit (not shown).
  • the load cell 1 includes the load receiving portion 2, the strain generating body 3, and the peripheral frame 5 formed integrally, and the height of the upper surface of the load receiving portion 2 is set to It is set higher than the height of the upper surface of the frame 5 by a predetermined size, and when the load table 11 moves downward due to the load, the load table 11 and the strain element 3 and the surrounding frame 5 They do not touch.
  • the load-receiving part 2 has a through-hole 2 K in the center, whose inner diameter on the lower side (opposite to the load table 11) is larger than the inner diameter on the upper side (load table 11 side).
  • a female screw 2 M is formed as a joint with the loading platform 1 1, and the columnar core 2 a and the core 2 a whose outer diameter on the lower side is larger than the outer diameter on the upper side are formed.
  • the load of the object X acts as W x on the load table 11 as shown in FIG. 3, and is distributed to each load cell, as shown in FIG.
  • a load cell 1 acts as a force P on the load receiving portion 2 of the mouth cell 1 (the distribution ratio varies depending on the position of the object X).
  • the load receiving portion 2 When the load receiving portion 2 is displaced downward by the load, the inner periphery is fixed to the load receiving portion 2 and the ring-shaped strain generating element 3 having the outer periphery fixed to the peripheral portion 5 is deformed.
  • the amount of strain of the flexure element 3 is detected by the strain gauges 4 a and 4 b attached to the back of the thin portion 3 a of the flexure element 3, and the load applied to the load cell 1 based on the amount of distortion is detected.
  • Ask for. Similarly, the loads from the other load cells are obtained, and the weight of the object X can be obtained by summing the loads.
  • the load receiving portion 2 of the present invention is composed of a core portion 2a joined to the load base 11 and an elastic body 2b formed so as to surround the core portion 2a.
  • the vertical load P from 1 is transmitted directly to the load receiving body 2A.
  • the flexure element 3 is deformed only by the vertical load P, it is possible to perform an accurate load measurement, the horizontal load F x, damage to the load cell 1 due to F y and tilting loads M x It
  • the load-receiving portion 2 is made substantially equal in height to the load-receiving portion main body 2A and the strain-generating body 3, and the holder 2B If the part 2a is made to protrude from the upper surface of the load receiving part body 2A by a predetermined height and the area around the protruding part of the core part 2a is surrounded by the elastic body 2c, horizontal load and tilt The load can be absorbed more reliably, and the load can be measured more accurately.
  • the diameter of the lower part of the core 2a of the holder 2B is formed larger than the diameter of the upper part, so that when a large upward force is applied, the elastic body 2b The core 2a itself does not come off from the load receiving portion main body 2A even if broken, so that the strength reliability is also improved.
  • the cross-sectional shape of the through hole 2K formed in the lower part of the core 2a and the load receiving body 2A may be an ellipse, an ellipse or a rectangle. If this is the case, it is possible to more reliably prevent the holder 2B from coming off the core and around the core.
  • the holder 2B has a configuration in which the holder 2B is a cylinder having a female thread cut in a length direction and the inner diameter of the load receiving portion main body 2A is constant. It goes without saying that even a simple structure having the through-hole 2R can absorb the horizontal load and the tilting load, and can accurately measure the load. Further, by adopting such a configuration of the load receiving portion 2, the entire load cell 1 is integrally formed. can do.
  • a core 2a having a screw 2N or a core 2a having a through hole 2Q may be used.
  • the load-receiving portion 2 is formed into a cylindrical shape in which a concave portion 2S is formed in the load-receiving portion main body 2A, and a female screw is formed in the concave portion 2S.
  • the holder 2 having the core 2a or the core 2a having a male screw 2N projecting from the core body toward the load table 11 may be inserted.
  • the load receiving portion 2 is formed so as to surround the core portion 2 a provided with the female screw 2 M for joining to the load table 1 1 and the core portion. Since it is composed of the holder 2B composed of the elastic body 2b and the load receiving section main body 2A into which the holder 2B is inserted, the vertical load P from the load table 11 is directly transmitted to the load receiving section main body 2A. Since the horizontal load F and the tilting load M are absorbed by the elastic body 2b and are not transmitted to the load cell 1, accurate load measurement can be performed, and the load cell caused by the horizontal load F and the tilting load M can be measured. 1 can prevent damage.
  • the load cell having a circular planar shape has been described.
  • the planar shape of the load cell is not limited to this, and may be a quadrangle or a polygon.
  • FIGS. 10 (a) and 10 (b) show the configuration of a load cell 101 used for the platform scale 1 OA.
  • the load cell 101 has a rectangular plate-shaped load receiving portion 2 and the load receiving portion 2.
  • a frame-shaped peripheral part 5 provided around the load part 2 and four corners in the longitudinal direction of the load-receiving part 2 are provided so as to bridge between the load-receiving part 2 and the peripheral part 5.
  • the inner diameter of the lower part for inserting the holder 2B which is a joining member with the load base 11, is placed on the strain body 3 side of the load part main body 2A of the receiving load part 2.
  • a through hole 2 K larger than the inner diameter of the hole 2 K is provided, and the holder 2 B is inserted into the through hole 2 K.
  • reference numeral 8 denotes a peripheral frame having an inclined surface for guiding the object to be weighed to the platform scale 1OA
  • reference numeral 9 denotes a distortion detection circuit not shown. It is a measurement cape of distortion gauge.
  • FIGS. 12 (a) and (b) show an example of a load cell 102 having a square planar shape
  • FIGS. 13 (a) and (b) show a load cell 102 having the above structure.
  • FIG. 3 is a diagram showing a configuration of a platform scale 10B.
  • the load cell 102 includes a rectangular plate-shaped load receiving portion 2, a frame-shaped peripheral portion 5 provided around the load receiving portion 2, and four diagonal corners of the load receiving portion 2. It is composed of a beam-shaped flexure element 3 provided so as to bridge between the part 2 and the peripheral part 5.
  • a core portion 2 a provided with a female screw 2 M for joining with the load table 11 and the core portion 2 a were formed so as to surround the core portion.
  • the holder 2B composed of the elastic body 2b is inserted, and the load table 11 and the load cell 102 are joined via the elastic sheet 2d.
  • the load cell of the present invention is configured such that a load receiving portion receiving a load from a load base is formed of a core having a joint with the load base and an elastic body formed so as to surround the core. And a load receiving portion main body to which the joining member is inserted and which is joined to the strain-generating body so that a horizontal load or a tilting load is absorbed by the elastic body and is not transmitted to the mouth cell.
  • a load receiving portion main body to which the joining member is inserted and which is joined to the strain-generating body so that a horizontal load or a tilting load is absorbed by the elastic body and is not transmitted to the mouth cell.
  • the above-mentioned joint portion is formed of a member having a female screw or a through hole or a member having a male screw projecting from the core to the load table side, it is possible to connect the load cell to the load table with a simple configuration. it can.
  • a through-hole is formed in the load-receiving part body, and the joining member is inserted into this through-hole, so that horizontal load and tilting load can be absorbed with a simple structure, and the entire mouth cell is integrally formed. can do.
  • the joining member since the outer dimension of the joining member on the side opposite to the load table is formed larger than the outer dimension of the load table, the joining member can be prevented from coming off from the load receiving portion main body.
  • the outer dimensions of the above-mentioned core part on the side opposite to the load table are made larger than the external dimensions of the load table side, even when a large upward force is applied, the core part itself will be separated from the load receiving part body. Since there is no escape, strength reliability can be improved. Further, since the concave portion is formed in the load receiving portion main body and the joining member is inserted into the concave portion, the load receiving portion can be easily formed.

Landscapes

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

Abstract

L'invention concerne un capteur de force capable d'augmenter la précision de mesure et la fiabilité en puissance par la transmission d'une charge verticale agissant sur le capteur de force précisément sur un corps tendeur, et protégeant efficacement le capteur contre les forces horizontales et une charge oblique, sans que l'épaisseur du capteur lui-même ne soit augmentée. Une partie recevant la charge (2) du capteur (1) comprend un support (2B) formé d'une partie centrale (2a) dans laquelle une vis creuse (2M) est prévue, se connectant à une plaque de charge (11), un corps élastique (2b) conçu, de sorte qu'il entoure la partie centrale (2a), et un corps principal récepteur de charge (2A) dans lequel le support (2B) est inséré.
PCT/JP2000/003126 1999-06-03 2000-05-15 Capteur de force WO2000075617A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11157015A JP2000346723A (ja) 1999-06-03 1999-06-03 ロードセル
JP11/157015 1999-06-03

Publications (1)

Publication Number Publication Date
WO2000075617A1 true WO2000075617A1 (fr) 2000-12-14

Family

ID=15640325

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/003126 WO2000075617A1 (fr) 1999-06-03 2000-05-15 Capteur de force

Country Status (2)

Country Link
JP (1) JP2000346723A (fr)
WO (1) WO2000075617A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3450948A1 (fr) * 2017-09-04 2019-03-06 GTM Testing and Metrology GmbH Dispositif dynamométrique

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002286743A (ja) * 2001-03-22 2002-10-03 Kayaba Ind Co Ltd 振動・揺動レベル計測装置及びその計測方法
US7210362B2 (en) * 2002-11-05 2007-05-01 Tanita Corporation Diaphragm type load detection sensor, load detection unit and electronic scale using same
JP2005249598A (ja) 2004-03-04 2005-09-15 Denso Corp 荷重検出装置
JP2008256538A (ja) * 2007-04-05 2008-10-23 Alps Electric Co Ltd 荷重センサ
JP5904017B2 (ja) * 2012-05-31 2016-04-13 アイシン精機株式会社 荷重検出装置
US9383271B2 (en) 2012-05-31 2016-07-05 Aisin Seiki Kabushiki Kaisha Load detection device
JP6011270B2 (ja) * 2012-11-20 2016-10-19 アイシン精機株式会社 荷重検出装置
DE102016118045A1 (de) * 2016-09-23 2018-03-29 Minebea Intec GmbH Querkraft-unempfindliche Messzelle
CN207751564U (zh) * 2017-08-07 2018-08-21 永正传感(杭州)有限公司 超低模块称重传感器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396079A (en) * 1981-07-29 1983-08-02 Sensor Developments, Inc. Weighing system
JPS63105037U (fr) * 1986-12-24 1988-07-07
US5461933A (en) * 1994-02-04 1995-10-31 Acutus Industries, Inc. Shear web load cell having thermal compensation
JPH09178579A (ja) * 1995-12-25 1997-07-11 Bridgestone Corp 荷重測定装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396079A (en) * 1981-07-29 1983-08-02 Sensor Developments, Inc. Weighing system
JPS63105037U (fr) * 1986-12-24 1988-07-07
US5461933A (en) * 1994-02-04 1995-10-31 Acutus Industries, Inc. Shear web load cell having thermal compensation
JPH09178579A (ja) * 1995-12-25 1997-07-11 Bridgestone Corp 荷重測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3450948A1 (fr) * 2017-09-04 2019-03-06 GTM Testing and Metrology GmbH Dispositif dynamométrique

Also Published As

Publication number Publication date
JP2000346723A (ja) 2000-12-15

Similar Documents

Publication Publication Date Title
US6417466B2 (en) Load cell with bossed sensor plate for an electrical weighing scale
EP0505493B1 (fr) Cellule de pesee monobloc de forme plate fabriquee en masse, et balance l'abritant
US3869007A (en) Weighing table particularly for a roller conveyor
US20060289207A1 (en) Weighing module with precisely-positionable overload protection device
JP4028785B2 (ja) 荷重検出ユニットおよびこれを利用した電子秤
US6812414B2 (en) Weighing scale
US6639158B2 (en) Weighing scale with level compensating foot assembly
WO2000075617A1 (fr) Capteur de force
US20060219028A1 (en) Strain sensor that compensates for thermal strain
US4278139A (en) Weighing apparatus with overload protection for off-center loading
US7910841B2 (en) Weighing scale with level compensating foot assembly
JPH0579930A (ja) ロードセル
US4420054A (en) Weighing apparatus with overload protection for off-center loading
US20110127091A1 (en) Planar Beam Load Cell Assembly
JP3128216U (ja) 体重計
JP2014109438A (ja) 起歪体、ロードセル、及び計量装置
CN211717572U (zh) 一种力传感器
CN209745440U (zh) 测力传感器
CN113049070A (zh) 一种力传感器
CA2071223C (fr) Dynamometre monobloc plat fabrique en series et balances en comportant
JP3074892U (ja) 水平力阻止機能を備えた荷重検出装置
JP3975611B2 (ja) 電子天びん
CN216433193U (zh) 应变基片、称重传感器以及底座组件
KR20010024325A (ko) 계량저율
JP2012118005A (ja) ロードセル

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase