WO2013132288A1 - Capteur de charge tensiométrique à compression - Google Patents

Capteur de charge tensiométrique à compression Download PDF

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Publication number
WO2013132288A1
WO2013132288A1 PCT/IB2012/051028 IB2012051028W WO2013132288A1 WO 2013132288 A1 WO2013132288 A1 WO 2013132288A1 IB 2012051028 W IB2012051028 W IB 2012051028W WO 2013132288 A1 WO2013132288 A1 WO 2013132288A1
Authority
WO
WIPO (PCT)
Prior art keywords
cups
balls
housing
sensing element
tips
Prior art date
Application number
PCT/IB2012/051028
Other languages
English (en)
Russian (ru)
Inventor
Борис Львович ПАЦЕНКЕР
Original Assignee
Patsenker Boris Lvovich
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 Patsenker Boris Lvovich filed Critical Patsenker Boris Lvovich
Priority to PCT/IB2012/051028 priority Critical patent/WO2013132288A1/fr
Publication of WO2013132288A1 publication Critical patent/WO2013132288A1/fr

Links

Classifications

    • 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
    • G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
    • 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
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload

Definitions

  • the claimed invention relates to measuring technique, namely, the measurement of mechanical force using compression strain gauges, which are used in a variety of load meters, in particular, weight.
  • the inventive sensor is particularly useful in conditions where the application of the load causes deformation of the structure that transfers the load to the sensor.
  • strain gauge sensors which, in general, differ in design and are combined by a measurement method based on measuring the electrical resistance of resistors glued to an elastic base or otherwise attached to its base, capable of deforming under the action of compression forces, which causes a change in the resistance of sensitive to this strain of resistors.
  • the inventive device is intended mainly for scales of large cargoes, such as cars and railway cars.
  • a compression strain gauge load sensor which includes a column in the form of a dumbbell of a predetermined length, which has a convex upper and lower surfaces, and a middle part with symmetry about the primary axis of the column, and the specified lower convex surface is part of the surface of the first sphere with the first radius and the first center located on the specified primary axis, the specified convex upper surface is part of the second sphere with the second radius and the second center located on the specified primary axis, the sum of the specified first radius and the specified second radius is greater than the specified predetermined length, so that the specified column is self-stabilizing if it is placed in an upright position between two substantially horizontal surfaces; the strain gauge is attached to the specified middle part in the middle between the specified first and second centers, at right angles to the specified axis to integrate compression deformation around the specified column, sealing means for protecting the specified strain gauge from moisture and other environmental influences and means of electrical communication of the
  • Such load sensors are used in almost all scales, and the main components of the measurement error associated with the sensor - its non-linearity and hysteresis - do not exceed 0.02-0.03%.
  • these parameters are normalized for harsh operating conditions of the sensor, namely, for the deviation of the axis of application of the load from the specified primary axis of not more than 0.2 angular degrees. If these requirements are not met, those. when, for example, the angle of inclination of the structure transferring the load to the sensor and / or the angle of inclination of the axis of the sensor to the vertical such that the angle between the axis along which the load is applied and the specified primary axis is greater than 0.2 angular degrees, the measurement error exceeds the normalized and increases with increasing specified angle.
  • Said primary axis is a longitudinal axis along which a load is to be applied, and which in the following description will be referred to as a predetermined axis of the sensing element.
  • the basis of the proposed technical solution is the task of creating a compression strain gauge load sensor with reduced sensitivity to the above tilt angles and, consequently, reduce the error in measuring weight with economically and physically feasible rigidity of the specified design.
  • the known compression strain gauge load sensor which includes an elongated sensitive element with upper and lower tips, the outer supporting surfaces of which are parts, respectively, of the first and second spheres, a housing with a cable and a sealed electrical input on the side surface of the housing, the sensing element is hermetically enclosed by the housing so that the tips protrude outside the housing, and the centers of the first and second spheres lie on a predetermined axis of the sensing element, improved as follows: the supporting surfaces of the tips are made concave;
  • the sensor further comprises two balls, two cups with concave surfaces that are part of the third and fourth spheres, and two sealing elements; balls are installed between the concave surfaces of the tips of the sensing element and the cups;
  • - sealing elements are installed between the cups and tips of the sensing element; the cups are tilted relative to the specified predetermined axis; the radii of the concave surfaces of the tips and their corresponding cups are greater than the radii of the balls inserted between them.
  • the concave surfaces of the cups and tips, as well as the surfaces of the balls are coated with antifriction grease.
  • FIG. 1 shows a compression strain gauge load sensor according to the invention, which includes an elongated element 1 with upper 2 and lower 3 tips, corresponding concave outer supporting surfaces 4, 5 of which are parts of the first and second spheres with radii R1 and R2, respectively, housing 6 with cable 7 and a sealed electrical input 8 on the side surface of the housing 6, wherein the sensing element 1 is hermetically enclosed by the housing b so that the tips 2, 3 protrude outside the housing b, and the centers of the first and second spheres l lie on a predetermined axis of the sensor element, shown by the chain line.
  • the senor contains upper 9 and lower 10 balls, upper 11 and lower 12 cups with concave surfaces 13 and 14, respectively, which are parts of the third and fourth spheres with radii R3 and R4, and the upper 15 and lower 16 sealing elements in the form of elastic tori.
  • cups 10 are installed between the concave surfaces 4, 5 of the tips 2, 3 of the sensor 1 and cups 12, 13, and the sealing elements 14 and 15 are installed, respectively, between the cups 10, 11 and the tips 2, 3 of the sensor 1.
  • cups 10 are installed between the concave surfaces 4, 5 of the tips 2, 3 of the sensor 1 and cups 12, 13, and the sealing elements 14 and 15 are installed, respectively, between the cups 10, 11 and the tips 2, 3 of the sensor 1.
  • cups 10 are installed between the concave surfaces 4, 5 of the tips 2, 3 of the sensor 1 and cups 12, 13, and the sealing elements 14 and 15 are installed, respectively, between the cups 10, 11 and the tips 2, 3 of the sensor 1.
  • cups 10 are installed between the concave surfaces 4, 5 of the tips 2, 3 of the sensor 1 and cups 12, 13, and the sealing elements 14 and 15 are installed, respectively, respectively, between the cups 10, 11 and the tips 2, 3 of the sensor 1.
  • cups 10 are installed between the concave surfaces 4, 5 of the tips 2, 3 of the sensor 1 and cups 12, 13, and the sealing elements 14 and 15 are installed, respectively, respectively, between
  • the claimed device is intended mainly for scales for large-capacity cargoes, such as cars and railway cars.
  • several identical sensors are used, each of which works as follows.
  • the lower cup 12 is attached to a rigid fixed base, and the upper cup 11 is attached to a support platform on which the load to be weighed is placed.
  • the supporting platform is a rigid body of large mass, but even in the initial position, i.e. in the absence of a weighed load, it bends so that the upper sensor cup 12, possibly together with the ball 9, rotates around the axis of the ball 9.
  • the axis of the sensor deviates from the vertical, i.e. the lower tip 3, possibly together with the ball 10, rotates around the center of the ball 10.
  • the situation is similar to that described above, namely, even if the center of the ball 10 deviates from the axis, the rolling and colliding forces will try to return the center of the ball 10 to axis.
  • a compression strain gauge sensor has been created in which the compressive force of the sensitive strain gauge element is applied practically along its axis at points lying on the axis, independently, within the necessary limits, from the angle of inclination of the structure that transfers the load to the sensor and the angle of inclination of the sensor relative to vertical axis i.e. a sensor with reduced sensitivity to the indicated slopes.
  • the error in measuring the weight of the cargo can be reduced practically to the instrumental error of the sensors themselves, which is determined mainly by their non-linearity and hysteresis.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention se rapporte au domaine des techniques de mesure, et concerne essentiellement un capteur de charge tensiométrique à compression comprenant un élément sensible allongé avec des embouts supérieur et inférieur, des surfaces de support externes représentant des parties, respectivement, d'une première et d'une seconde sphères, un corps avec un câble et une entrée électrique hermétique sur la surface latérale du corps. L'élément sensible est entouré hermétiquement par le corps de sorte que les embouts dépassent à l'extérieur du corps, tandis que les centres desdites première et seconde sphères se situent sur un axe prédéterminé de l'élément sensible. Les améliorations suivantes ont été apportées : les surfaces de support des embouts sont concaves, le capteur comprend en outre deux sphères, deux coupelles avec des surfaces concaves formant des parties de troisième et quatrième sphères, et deux éléments d'étanchéité ; les sphères sont disposées entre les surfaces concaves des embouts de l'élément sensible des coupelles, les éléments d'étanchéité sont disposés entre les coupelles et les embouts de l'élément sensible, les coupelles peuvent présenter une inclinaison par rapport à l'axe prédéterminé, et les rayons des surfaces concaves des embouts et des coupelles leur correspondant sont supérieurs aux rayons des sphères disposées entre elles. Le résultat technique consiste en une diminution des erreurs de mesure.
PCT/IB2012/051028 2012-03-05 2012-03-05 Capteur de charge tensiométrique à compression WO2013132288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/051028 WO2013132288A1 (fr) 2012-03-05 2012-03-05 Capteur de charge tensiométrique à compression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/051028 WO2013132288A1 (fr) 2012-03-05 2012-03-05 Capteur de charge tensiométrique à compression

Publications (1)

Publication Number Publication Date
WO2013132288A1 true WO2013132288A1 (fr) 2013-09-12

Family

ID=49115995

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/051028 WO2013132288A1 (fr) 2012-03-05 2012-03-05 Capteur de charge tensiométrique à compression

Country Status (1)

Country Link
WO (1) WO2013132288A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1041885A1 (ru) * 1981-02-25 1983-09-15 Предприятие П/Я М-5629 Полупроводниковый пьезорезистивный преобразователь силы
US4804053A (en) * 1987-11-10 1989-02-14 Flintab Ab Rocker pin load cell
US6433289B1 (en) * 1999-10-25 2002-08-13 Scaleco Weighing device
US20040251059A1 (en) * 2003-06-10 2004-12-16 The Flintec Group, Ltd. Compression column load cell

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1041885A1 (ru) * 1981-02-25 1983-09-15 Предприятие П/Я М-5629 Полупроводниковый пьезорезистивный преобразователь силы
US4804053A (en) * 1987-11-10 1989-02-14 Flintab Ab Rocker pin load cell
US4804053B1 (en) * 1987-11-10 1996-09-03 Flintab Ab Rocker pin load cell
US6433289B1 (en) * 1999-10-25 2002-08-13 Scaleco Weighing device
US20040251059A1 (en) * 2003-06-10 2004-12-16 The Flintec Group, Ltd. Compression column load cell

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