FR2697629A1 - Sampling method for mechanical & hydraulic units in lifting system - uses samples from several known loads to produce correction curve proportional to each load - Google Patents

Sampling method for mechanical & hydraulic units in lifting system - uses samples from several known loads to produce correction curve proportional to each load Download PDF

Info

Publication number
FR2697629A1
FR2697629A1 FR9213194A FR9213194A FR2697629A1 FR 2697629 A1 FR2697629 A1 FR 2697629A1 FR 9213194 A FR9213194 A FR 9213194A FR 9213194 A FR9213194 A FR 9213194A FR 2697629 A1 FR2697629 A1 FR 2697629A1
Authority
FR
France
Prior art keywords
load
mechanical
correction curve
several known
sampling
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR9213194A
Other languages
French (fr)
Other versions
FR2697629B1 (en
Inventor
Timbert Francois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR9213194A priority Critical patent/FR2697629B1/en
Publication of FR2697629A1 publication Critical patent/FR2697629A1/en
Application granted granted Critical
Publication of FR2697629B1 publication Critical patent/FR2697629B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
    • G01D3/022—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation having an ideal characteristic, map or correction data stored in a digital memory
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/008—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00 with calibration coefficients stored in memory
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/01—Testing or calibrating of weighing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Technology Law (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The relative curve between hydraulic pressure and load is not a straight line. The sampling method permits sampling from several points of reference to produce a correction curve proportional to each load to be measured which is placed in memory. A coefft. is automatically calculated and stored in a non-volatile memory. The coefft. represents the ratio between the raw measurement and the actual weight. Sampling is carried out using several known loads. The accuracy is directly related to the number of memorised sampling points. USE/ADVANTAGE- Complex combination of mechanical and hydraulic units; weight measurement. Provides greater precision than that offered by current systems.

Description

L'invention concerne un " procédé d'étalonnage d'une chaine cinématique complexe comportant l'association d'éléments mécaniques et hydrauliques, pouvant en particulier être appliquée au contrôle des charges transportées par un engin de manutention, tel que chariot élévateur."
La présente invention concerne un procédé d'étalonnage d'une chaine cinématique complexe, associant en particulier des éléments mécaniques et hydrauliques, afin d'obtenir la mise en mémoire d'une courbe de calcul automatique de proportionnalité entre une mesure brute et une mesure dont l'unité est choisie préalablement.The invention relates to a "method for calibrating a complex kinematic chain comprising the combination of mechanical and hydraulic elements, which can in particular be applied to the control of the loads transported by a handling machine, such as a forklift."
The present invention relates to a method for calibrating a complex kinematic chain, associating in particular mechanical and hydraulic elements, in order to obtain the storage of an automatic proportionality calculation curve between a raw measurement and a measurement whose the unit is chosen beforehand.

Ce procédé concerne principalement les mesures de poids effectuées par tous les engins comportant un bras de relevage associé à un ou plusieurs vérins hydrauliques. This process mainly concerns the weight measurements carried out by all the machines comprising a lifting arm associated with one or more hydraulic cylinders.

Les mesures de poids sont effectuées traditionnellement par un capteur de pression en dérivation sur le circuit du vérin de montée des organes de chargement tels que, godet, fourche, benne. Weight measurements are traditionally carried out by a bypass pressure sensor on the circuit of the lifting cylinder for loading members such as, bucket, fork, bucket.

Actuellement il est affecté à ces mesures un coefficient unique et constant, soit aléatoire, soit déterminé par un seul point d'étalonnage effectué avec une charge connue. Currently a unique and constant coefficient is assigned to these measurements, either random or determined by a single calibration point carried out with a known load.

Dans l'état actuel de la technique, il est fait abstraction de la non linéarité de la chaine cinématique, ce qui a pour conséquence l'imprécision des mesures effectuées sur l'étendue totale de l'échelle de celle-ci. En effet, les parasites qui influent sur la mesure, tels que, le frottement des axes, l'usure des cylindres, les fuites ont la particularité de créer des perturbations variables proportionnelles à la charge à mesurer. In the current state of the art, the non-linearity of the kinematic chain is disregarded, which results in the imprecision of the measurements carried out over the entire extent of the scale thereof. Indeed, the parasites which influence the measurement, such as, the friction of the axes, the wear of the cylinders, the leaks have the particularity of creating variable disturbances proportional to the load to be measured.

Le procédé, selon l'invention permet de remédier à cet inconvénient majeur. I1 consiste à effectuer au préalable un étalonnage sous plusieurs charges supportées par la chaine cinématique et de mettre en mémoire la courbe de correction. The method according to the invention overcomes this major drawback. I1 consists in carrying out a calibration beforehand under several loads supported by the kinematic chain and in memorizing the correction curve.

L'opération d'étalonnage doit être effectuée dans une position déterminée de la chaine cinématique, par un index de positionnement par exemple. The calibration operation must be performed in a determined position in the kinematic chain, for example by a positioning index.

Cette position servira de référence pour la prise de mesures correctes pendant le pesage. This position will serve as a reference for taking correct measurements during weighing.

La procédure d'étalonnage est simple et est effectuée normalement par l'utilisateur de l'engin.  The calibration procedure is simple and is performed normally by the user of the machine.

Après tarage de l'appareil effectué dans la position déterminée par l'index, l'opérateur met une charge connue sur l'élément porteur, la mesure brute est affichée. Celle-ci est corrigée manuellement par l'opérateur au moyen de touches, jusqu'à obtention du vrai poids sur l'afficheur. Un coefficient est alors calculé automatiquement et mis en mémoire. Celui-ci représente la proportion existante entre la mesure brute et le vrai poids. Celui-ci est la représentation des parasites affectant la chaine cinématique pour un poids donné. L'opération est reconduite plusieurs fois pour des poids différents. La courbe de correction ainsi définie pour tous les poids mesurés est mis en mémoire non volatile. After taring the device in the position determined by the index, the operator places a known load on the carrier element, the raw measurement is displayed. This is corrected manually by the operator by means of keys, until the true weight is obtained on the display. A coefficient is then calculated automatically and stored in memory. This represents the proportion existing between the gross measurement and the real weight. This is the representation of parasites affecting the kinematic chain for a given weight. The operation is repeated several times for different weights. The correction curve thus defined for all the measured weights is stored in non-volatile memory.

I1 apparait clairement que la précision obtenue est liée directement au nombre de points mémorisés lors d e l'étalonnage. La précision obtenue après l'utilisation du présent procédé est de 1% de la charge mesurée à pleine échelle. Le présent procédé se caractérise par la précision supplémentaire et significative qu'il apporte aux mesureurs de charges utilisant des capteurs de pressions hydrauliques. It is clear that the precision obtained is directly linked to the number of points memorized during the calibration. The precision obtained after using the present method is 1% of the load measured at full scale. The present process is characterized by the additional and significant precision which it provides to load gauges using hydraulic pressure sensors.

Les chariots élévateurs et chargeurs à godet sont les principales applications du procédé. The main applications of the process are forklifts and bucket loaders.

A titre d'exemple et pour faciliter la compréhension de l'invention, on a représenté par la figure N" 1 un schéma d'explication. By way of example and to facilitate understanding of the invention, there is shown in Figure N "1 an explanatory diagram.

En ordonnée l'échelle de pression mesurée en bars dans le ou les vérins de levée. On the ordinate, the pressure scale measured in bars in the lift cylinder (s).

En abscisse les poids déposés successivement dans le godet par exemple. On the abscissa the weights successively deposited in the bucket for example.

On s'aperçoit que la courbe Poids/Pression n'est pas directement proportionnelle donc non linéaire. We can see that the Weight / Pressure curve is not directly proportional and therefore not linear.

Le procédé objet de l'invention permet d'étalonner et de mettre en mémoire les segments de droite compris entre deux points de mesure d'étalonnage effectués avec des poids connus (entre 0 et 1 - t et 2 - 2 et 3 et ainsi de suite).  The method which is the subject of the invention makes it possible to calibrate and store the line segments comprised between two calibration measurement points carried out with known weights (between 0 and 1 - t and 2 - 2 and 3 and thus after).

Claims (2)

REVENDICATIONS 1- Procédé d'étalonnage d'une chaine cinématique complexe comportant des éléments mécaniques et hydrauliques, caractérisé par la mise en mémoire d'une courbe de correction automatique proportionnelle à chaque charge à mesurer et dont l'application principale concerne les mesures de poids effectuées par les engins comportant un bras de levage associé à un système hydraulique comportant un ou plusieurs vérins.1- Method for calibrating a complex kinematic chain comprising mechanical and hydraulic elements, characterized by storing an automatic correction curve proportional to each load to be measured and the main application of which relates to the weight measurements carried out by machines comprising a lifting arm associated with a hydraulic system comprising one or more jacks. 2 - Procédé suivant la revendication 1 dans lequel l'étalonnage s'effectue sous plusieurs charges connues. 2 - Process according to claim 1 wherein the calibration is carried out under several known loads.
FR9213194A 1992-11-04 1992-11-04 Method for calibrating a complex kinematic chain comprising the combination of mechanical and hydraulic elements. Expired - Fee Related FR2697629B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9213194A FR2697629B1 (en) 1992-11-04 1992-11-04 Method for calibrating a complex kinematic chain comprising the combination of mechanical and hydraulic elements.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9213194A FR2697629B1 (en) 1992-11-04 1992-11-04 Method for calibrating a complex kinematic chain comprising the combination of mechanical and hydraulic elements.

Publications (2)

Publication Number Publication Date
FR2697629A1 true FR2697629A1 (en) 1994-05-06
FR2697629B1 FR2697629B1 (en) 1995-11-03

Family

ID=9435162

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9213194A Expired - Fee Related FR2697629B1 (en) 1992-11-04 1992-11-04 Method for calibrating a complex kinematic chain comprising the combination of mechanical and hydraulic elements.

Country Status (1)

Country Link
FR (1) FR2697629B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044707A2 (en) * 1980-07-17 1982-01-27 Kabushiki Kaisha Shimadzu Seisakusho An electronic balance
WO1986003831A1 (en) * 1984-12-19 1986-07-03 Robert Bosch Gmbh Sensor for measuring physical magnitudes and method for adjusting the sensor
FR2577042A1 (en) * 1985-02-01 1986-08-08 Yamato Scale Co Ltd AUTOMATIC CORRECTION DEVICE FOR A COMBINATION WEIGHING SYSTEM
FR2658907A1 (en) * 1990-02-27 1991-08-30 Prima Misure Spa METHOD FOR METROLOGICAL TESTING AND SELF-CORRECTION OF GEOMETRIC DETECTION ERRORS IN A MEASUREMENT MACHINE.
US5067572A (en) * 1990-08-20 1991-11-26 Caterpillar Inc. Dynamic payload monitor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044707A2 (en) * 1980-07-17 1982-01-27 Kabushiki Kaisha Shimadzu Seisakusho An electronic balance
WO1986003831A1 (en) * 1984-12-19 1986-07-03 Robert Bosch Gmbh Sensor for measuring physical magnitudes and method for adjusting the sensor
FR2577042A1 (en) * 1985-02-01 1986-08-08 Yamato Scale Co Ltd AUTOMATIC CORRECTION DEVICE FOR A COMBINATION WEIGHING SYSTEM
FR2658907A1 (en) * 1990-02-27 1991-08-30 Prima Misure Spa METHOD FOR METROLOGICAL TESTING AND SELF-CORRECTION OF GEOMETRIC DETECTION ERRORS IN A MEASUREMENT MACHINE.
US5067572A (en) * 1990-08-20 1991-11-26 Caterpillar Inc. Dynamic payload monitor

Also Published As

Publication number Publication date
FR2697629B1 (en) 1995-11-03

Similar Documents

Publication Publication Date Title
EP0227870A1 (en) Automatically controlled machine for rolling metal sheets
FR2466005A1 (en) METHOD AND APPARATUS FOR COMPENSATING FOR FLOWING AND DERIVATIVE IN A DIGITAL SCALE
FR2549096A1 (en) METHOD OF AUTOMATIC TESTING OF TEXTILE YARNS AND APPARATUS FOR IMPLEMENTING THIS PROCESS
CH632593A5 (en) ELECTRONIC SCALE.
CN109416243A (en) Tyre bead measuring system
FR2461579A1 (en) MECHANICAL PRESS AND DEVICE FOR ADJUSTING THE BALANCING OF THIS PRESS
US9823165B2 (en) Apparatus and method for measuring backlash
FR2697629A1 (en) Sampling method for mechanical & hydraulic units in lifting system - uses samples from several known loads to produce correction curve proportional to each load
EP0398809A1 (en) Method and apparatus for dynamic measuring of a load in motion in a vertical plane
CH667532A5 (en) DEVICE FOR MEASURING THE CUTTING FORCE AND LIMITING OVERLOADS IN A PLATE PRESS.
US4703815A (en) Span adjusting device for weigher
FR2533696A1 (en) WEAPON BELT APPARATUS
EP0039293B1 (en) Device for the very precise measurement of fluid pressure with indication of the measured pressure
FR2521290A1 (en) BALANCE WITH ELECTROMAGNETIC COMPENSATION
FR2615618A1 (en) DIGITAL COMPENSATION PRESSURE SENSOR
US5697240A (en) Method of determining the bend in a section of pipe
EP0246363A1 (en) Method and apparatus for weighing loads lifted by hydraulic devices
FR2797393A1 (en) DEVICE FOR THE NON-DESTRUCTIVE EXTENSOMETRIC MEASUREMENT OF CONTAINMENT FORCES LIKELY TO BE EXERCISED BY A LOW OR ADHESIVE-TYPE CONTAINMENT
US4792003A (en) Span adjusting device for weigher
US3566640A (en) Inspection and correction apparatus
JP3516001B2 (en) Quantitative weighing method by combination and its device
FR2634883A1 (en) High-precision hydraulic weighing apparatus
EP1759171A1 (en) Three-dimensional measurement method and device
CN212110036U (en) Weight hanging device applied to hydraulic structure horizontal displacement monitoring tension wire method
KR200329726Y1 (en) weight measuring equipment

Legal Events

Date Code Title Description
TP Transmission of property
CL Concession to grant licences
ST Notification of lapse

Effective date: 20110801