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EP1762138B1 - Doseur électronique en utilisant dosage et correction continues - Google Patents

Doseur électronique en utilisant dosage et correction continues Download PDF

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Publication number
EP1762138B1
EP1762138B1 EP06076914A EP06076914A EP1762138B1 EP 1762138 B1 EP1762138 B1 EP 1762138B1 EP 06076914 A EP06076914 A EP 06076914A EP 06076914 A EP06076914 A EP 06076914A EP 1762138 B1 EP1762138 B1 EP 1762138B1
Authority
EP
European Patent Office
Prior art keywords
pump
valve
fluid
piston
fluid valve
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.)
Revoked
Application number
EP06076914A
Other languages
German (de)
English (en)
Other versions
EP1762138A1 (fr
Inventor
David Pittman
Vu Nguyen
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.)
Graco Minnesota Inc
Original Assignee
Graco Minnesota Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37704414&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1762138(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Graco Minnesota Inc filed Critical Graco Minnesota Inc
Priority claimed from EP02786807.4A external-priority patent/EP1455567B2/fr
Publication of EP1762138A1 publication Critical patent/EP1762138A1/fr
Application granted granted Critical
Publication of EP1762138B1 publication Critical patent/EP1762138B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2112—Level of material in a container or the position or shape of the upper surface of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8821—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances involving controlling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8822—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using measuring chambers of the piston or plunger type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/03—Stopping, starting, unloading or idling control by means of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves

Definitions

  • European patent application published as EP 0630810 , describes a method and a device for metering out a quantity of paste-like material.
  • the device comprises a piston housed inside a cylinder.
  • the piston is hydraulically driven so as, in one direction of movement of the piston, to draw paste from a hopper into the cylinder in a withdrawal stroke and, in the other direction of movement of the piston, to force the paste out of the cylinder through an outlet valve during a compression stroke.
  • the hopper comprises an outlet, which communicates with the space inside the cylinder and this outlet is blocked by the passage of the piston inside the cylinder, this constituting a type of check-valve action during at least the compression stroke.
  • a pre-compression stroke is carried out, in which the paste is compressed while the outlet valve is still closed. This helps to force air out of the cylinder and out of the paste, which is inside the cylinder.
  • the outlet valve is closed as the piston starts its withdrawal stroke and is opened again just prior to the compression stroke.
  • US 4,191,309 discloses a product proportioner for food products.
  • the proportioner comprises a pump consisting of a pair of sleeve-and-piston arrangements, which dispense product through respective outlets in alternating fashion. It is described how the piston-and-sleeve arrangement may enter a stalled state, since the piston is not driven hard enough against the product in the sleeve so as propel the product through the outlet. However, the piston is forced with lower pressure against the product, and this produces a precompressing effect in order to remove air pockets. It is only when one of the pistons is in its fully dispensed position and is about to retract that the other piston is driven hard enough to dispense the product in its associated sleeve out through the outlet.
  • the document describes the use of a "check valve” which is located at the confluence of the outlet passages.
  • the valve is a dual-position valve, which allows product from one of two passages to pass into the discharge passage.
  • a valve in the discharge line acts to cut off product discharge through the outlet when a desired amount of product has been dispensed, taking into account the removal of the air pockets in the product.
  • each of a pair (or more) of air-operated reciprocating piston pumps (such as those sold by the assignee of the instant invention under the trademark KING TM ) is provided with a linear displacement transducer (LDT) which is capable of communicating a precise indication of the linear position of the air motor and pump rod. Also provided is a controllable valve connected to the output of each of the pumps.
  • LDT linear displacement transducer
  • the controller of the instant invention dispenses both components (or all three if a three component material) simultaneously and maintains ratio at the end of each predetermined volume of material.
  • both valves will be open initially.
  • the controller looks at whichever side has hit its mark first (2 for the A side and one for the B side) and closes the valve on that side until the other side "catches up” and hits its mark.
  • the following process is meant to correct for these issues.
  • the controller determines when the pump has changed over. (This is predictable from previous cycles, or observable from the LDT reading)
  • the controller will then close the fluid valve. This allows the pump to compress any gases and positively close the check valve.
  • the fluid valve is reopened. The position of the pump at that point is starting value for fluid dispensed on that stroke.
  • each of a pair (or more) of air-operated reciprocating piston pumps 12 (such as those sold by the assignee of the instant invention under the trademark KING TM ) is provided with a linear displacement transducer (LDT) 14 which is capable of communicating (as discussed in the aforementioned applications) a precise indication of the linear position of the air motor 12a and pump rod 12b.
  • LDT linear displacement transducer
  • the LDT 14 provides an output in units of travel or resolution which may vary with the model used. In the preferred embodiment, the resolution may be in the range of 1 ⁇ 4 to 1 ⁇ 2 inch.
  • a controllable valve 16 connected to the output of each of the pumps 12.
  • the controller of the instant invention dispenses both components (or all three if a three component material) simultaneously (at least initially) and maintains ratio at the end of each predetermined volume of material.
  • both valves will be open initially.
  • the controller 18 looks at whichever side has hit its mark first (2 units of travel for the A side and one for the B side) and closes the valve on that side until the other side "catches up" and hits its mark.
  • the system truly controls both sides rather than letting one run and trying to match the other as commonly occurs.
  • the following process is meant to correct for these issues.
  • the controller determines when the pump has changed over. (This is predictable from previous cycles, or observable from the LDT reading)
  • the controller will then close the fluid valve. This allows the pump to compress any gases and positively close the check valve.
  • the fluid valve is reopened. The position of the pump at that point is starting value for fluid dispensed on that stroke.
  • the air pressure can be varied so as to effectively run both pumps simultaneously and continuously.
  • the control may be set to control flow rather than pressure. If desired and sufficient length is available, the hose may be used as an integrator to aid in mixing. In another alternative embodiment, the lower volume side or material may be run at a higher pressure and with a single dosing valve.
  • the interface is divided into three sections.
  • the basic section are a run and a stop button.
  • Under a cover are a display that shows ratio, and a cycle counter and a 4-position rotary switch for
  • the controller will compensate for physical problems associated with top change-over. Cavitation, air entertainment, compressibility, or poor inlet check performance all result in a loss of correlation between pump travel and fluid dispensing. The following algorithm is meant to correct for these issues.
  • Error Special case of the stop mode. Fluid valves and recirculation valves closed. Error must be " acknowledged”.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Reciprocating Pumps (AREA)

Claims (1)

  1. Procédé de compensation du renversement du sens de la marche dans une pompe à piston alternatif (12) comportant un clapet anti-retour, où ladite pompe comporte un capteur de déplacement (14) et une vanne de fluide (16) au niveau de la sortie de ladite pompe, le procédé comprenant les étapes consistant à :
    fermer ladite vanne de fluide (16) lorsque la pompe atteint le renversement du sens de la marche afin de permettre à ladite pompe de comprimer n'importe quel gaz et de fermer positivement le clapet anti-retour, la pompe étant autorisée à caler, après quoi la vanne de fluide (16) est ouverte ; et
    ne pas tenir compte de n'importe quelle course et n'importe quel flux imputé pendant la portion du cycle où ladite vanne de fluide est fermée.
EP06076914A 2001-11-27 2002-11-27 Doseur électronique en utilisant dosage et correction continues Revoked EP1762138B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33369701P 2001-11-27 2001-11-27
EP02786807.4A EP1455567B2 (fr) 2001-11-27 2002-11-27 Doseur electronique utilisant un dosage et une correction continus

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP02786807.4A Division-Into EP1455567B2 (fr) 2001-11-27 2002-11-27 Doseur electronique utilisant un dosage et une correction continus
EP02786807.4A Division EP1455567B2 (fr) 2001-11-27 2002-11-27 Doseur electronique utilisant un dosage et une correction continus
EP02786807.4 Division 2002-11-27

Publications (2)

Publication Number Publication Date
EP1762138A1 EP1762138A1 (fr) 2007-03-14
EP1762138B1 true EP1762138B1 (fr) 2010-02-17

Family

ID=37704414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06076914A Revoked EP1762138B1 (fr) 2001-11-27 2002-11-27 Doseur électronique en utilisant dosage et correction continues

Country Status (1)

Country Link
EP (1) EP1762138B1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11906988B2 (en) 2006-03-06 2024-02-20 Deka Products Limited Partnership Product dispensing system
US7740152B2 (en) 2006-03-06 2010-06-22 The Coca-Cola Company Pump system with calibration curve
US9146564B2 (en) 2006-03-06 2015-09-29 Deka Products Limited Partnership Product dispensing system
US11214476B2 (en) 2006-03-06 2022-01-04 Deka Products Limited Partnership System and method for generating a drive signal
BRPI1006191A2 (pt) * 2009-03-26 2016-03-01 Graco Minnesota Inc método para dosar materiais de múltiplos componentes e método para compensar a comutação em uma bomba alternante
CN110839385A (zh) * 2019-10-30 2020-02-28 江苏大学 一种高精度施肥装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026439A (en) * 1975-06-18 1977-05-31 Cocks Eric H Precision fluid dispensing and mixing system
US4191309A (en) * 1977-11-23 1980-03-04 Marlen Research Corporation Product portioning in the continuous pumping of plastic materials
US4359312A (en) * 1978-08-15 1982-11-16 Zumtobel Kg Reciprocating pump for the pulsation-free delivery of a liquid
DE3029554A1 (de) * 1980-08-04 1982-03-11 Manfred 2000 Hamburg Berweger Anlage zum foerdern zweier oder mehrerer fluider medien unter hohem druck in einem einstellbaren mengenverhaeltnis
SE8305997L (sv) * 1983-11-01 1985-05-02 Rovac Ab Doseringsanordning
FR2706857B1 (fr) * 1993-06-25 1995-10-27 Dussau Distribution Sarl

Also Published As

Publication number Publication date
EP1762138A1 (fr) 2007-03-14

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