EP2803425A1 - Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung - Google Patents

Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung Download PDF

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Publication number
EP2803425A1
EP2803425A1 EP20130382178 EP13382178A EP2803425A1 EP 2803425 A1 EP2803425 A1 EP 2803425A1 EP 20130382178 EP20130382178 EP 20130382178 EP 13382178 A EP13382178 A EP 13382178A EP 2803425 A1 EP2803425 A1 EP 2803425A1
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EP
European Patent Office
Prior art keywords
bonding agent
vessel
mass
conveying unit
towards
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.)
Withdrawn
Application number
EP20130382178
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English (en)
French (fr)
Inventor
Iñaki Miguel Perez
Pablo Valencia Marco
José Ramón Rodriguez Menendez
Angel Alegre Cortes
Ekaitz Barrasa Artamendi
Alesander Olea Abarrategi
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.)
Loramendi S Coop
Original Assignee
Loramendi S Coop
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 Loramendi S Coop filed Critical Loramendi S Coop
Priority to EP20130382178 priority Critical patent/EP2803425A1/de
Priority to PCT/EP2014/059608 priority patent/WO2014184124A1/en
Publication of EP2803425A1 publication Critical patent/EP2803425A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the present invention is related to dosage apparatuses for machines adapted for manufacturing sand cores, and to operating methods for a dosage apparatus.
  • Sand cores are manufactured by mixing sand with a bonding agent, such as a type of resin for example, to harden it, and the process is performed in machines adapted for manufacturing sand cores.
  • a bonding agent such as a type of resin for example
  • the amount of bonding agent to be used is predetermined, and a dosage apparatus for metering the bonding agent is used to control the amount of bonding agent that is supplied to the machine.
  • a dosage apparatus comprising a cylinder that receives bonding agent from a specific source and ejects it in a controlled manner towards the machine where the core will be manufactured is known.
  • the ejection is performed in a controlled manner, so the ejected bonding agent is supplied in a controlled manner for manufacturing the core.
  • the cylinder comprises a piston the movement of which causes the bonding agent to be ejected from cylinder, and said ejection, and therefore the supplied amount of bonding agent for manufacturing the core, is controlled by means of a controlled movement of the piston, the volume of bonding agent that is ejected when the piston moves being detected. Due to the accuracy requisites required in some cases, this dosage apparatus is not always the most appropriate.
  • Such dosage apparatuses need leak-tight closures for their correct operation, and the elements providing the leak-tight closure can gradually deteriorate with use due to the chemical components of the bonding agent, for example, affecting the accuracy of the added bonding agent.
  • This drawback also affects the quality of the added bonding agent, because with the deterioration of said elements air can be introduced, for example, contacting the bonding agent to be supplied.
  • such dosage apparatuses require continuous maintenance and often times the replacement of the elements providing the closure, which is not always sustainable in economic terms.
  • the wrong measurements of the supplied volume of bonding agent with the piston can occur with temperature changes due to the change in the density of the bonding agent, which directly affects the supply of bonding agent to the core, which can imply a core that does not comply with the necessary requirements for having received less bonding agent than that necessary, or it can otherwise imply a bonding agent excess in the core and therefore an increase in the cost of manufacturing the core.
  • the apparatus disclosed in this document comprises a tubular vessel where the bonding agent to be supplied is introduced, and a plurality of sensors adjacent to the vessel.
  • the vessel comprises a float in the bonding agent that acts as a moving indicator of the amount of bonding agent present in the vessel.
  • the float comprises a permanent magnet and the sensors can comprise an electromagnet, such that they cooperate with the float and are able to emit a signal denoting the level (amount) of bonding agent in the vessel.
  • the apparatus further comprises a conveying unit for conveying the bonding agent from the vessel to its final destination where it will be mixed with the sand, and as a result of the float and the sensors the amount of bonding agent that is supplied can be determined without the bonding agent coming into contact with elements that it could damage.
  • An object of the invention is to provide a dosage apparatus for machines adapted for manufacturing sand cores, as described in the claims.
  • the dosage apparatus of the invention is designed to be used in machines adapted for manufacturing sand cores, and more specifically for supplying a bonding agent in a controlled manner for manufacturing sand cores in machines used for such purpose.
  • the apparatus comprises an inlet for receiving the bonding agent coming from a supply source which is preferably external to the apparatus but which could also be part of the apparatus itself, a vessel where the bonding agent coming from the supply source is stored, a conveying unit for conveying the bonding agent from one site to another within the apparatus, control means adapted for controlling the conveying unit, and an evacuation region through which the bonding agent coming from the vessel is evacuated towards its final destination.
  • the conveying unit comprises a motor, a pump operated by the rotation of the motor for loading the vessel with the bonding agent coming from the supply source and for discharging the bonding agent from the vessel towards the evacuation region, and a variable-frequency drive associated with the motor, which controls the rotation of the motor. Both the loading and unloading of the vessel can therefore be carried out in a simple manner.
  • the apparatus further comprises a scale which allows detecting the mass of the bonding agent being discharged from the vessel towards the evacuation region and which is communicated with the control means, the control means being adapted for acting on the variable-frequency drive depending on the information received from the scale so that the variable-frequency drive controls the rotation of the motor, the evacuation or discharge of the bonding agent from the vessel therefore being controlled depending on the measurements received from the scale.
  • the supply of the bonding agent is controlled taking into account the mass of the bonding agent and not its volume or its movement within a vessel, for example.
  • the bonding agent can therefore be supplied in a precise manner in order to obtain a sand core without the bonding agent coming into contact with sensitive elements that can deteriorate due to said contact.
  • High precision in the supply of the bonding agent can be obtained by using high-precision scales for determining the mass of the vessel and its content, as required by the user. Furthermore, the temperature change does not affect precision because the mass, not the volume, is detected.
  • Another object of the invention is to provide a machine for manufacturing sand cores as described in the claims.
  • the machine comprises a dosage apparatus such as the one discussed above, so the advantages discussed for the apparatus also serve for the machine.
  • Another object of the invention is to provide an operating method for a dosage apparatus for machines adapted for manufacturing sand cores, as described in the claims.
  • the method comprises a loading step in which bonding agent is loaded in a vessel of a dosage apparatus such as the one discussed above, and a supply step in which at least part of the bonding agent present in the vessel is discharged towards a machine adapted for manufacturing sand cores.
  • the supply step the mass of the vessel and its content is determined continuously, and the discharge is stopped depending on said measurement.
  • a supply of bonding agent can be obtained with the method of the invention in an easy, simple and precise manner.
  • the apparatus 100 comprises an inlet 1 for receiving the bonding agent preferably coming from an external supply source 200, a vessel 2 where the bonding agent coming from the supply source 200 is stored, a conveying unit 3 for conveying the bonding agent from one site to another within the apparatus 100, control means (not depicted in the drawings) adapted for controlling the conveying unit 3, and an evacuation region 5 through which the bonding agent coming from the vessel 2 is evacuated towards the machine.
  • the control means can comprise a controller, a microcontroller, a microprocessor, an FPGA or an equivalent device able to perform the required functions.
  • the conveying unit 3 comprises a motor M and a pump 30 operated by the rotation of the motor M for loading the vessel 2 with the bonding agent coming from the supply source 200 and for discharging the bonding agent from the vessel 2 towards the evacuation region 5, depending on the rotation direction of the motor M. Therefore, the conduit through which the bonding agent enters the vessel 2 and the conduit through which the bonding agent exits the vessel 2 correspond to one and the same conduit 7, the number of elements used in the apparatus 100 being reduced, resulting in a simpler, more compact and more economical apparatus 100.
  • the apparatus 100 further comprises a scale 6 which allows detecting the mass of the bonding agent being discharged from the vessel 2 towards the evacuation region 5 and which is communicated with the control means, the control means being adapted for acting on the variable-frequency drive of the conveying unit 3 depending on the information received from the scale 6, so that the variable-frequency drive controls the rotation of the motor M.
  • the bonding agent can therefore be supplied in a precise manner to the evacuation region 5, and therefore to a machine adapted for manufacturing sand cores, without the bonding agent coming into contact with sensitive elements that can deteriorate due to said contact.
  • Ample precision in the supply of bonding agent can further be obtained using high-precision scales for determining the mass of the vessel 2 and its content, as required by the user.
  • the scale 6 is arranged below the vessel 2 and is adapted for measuring or detecting the mass of the vessel 2 and of the bonding agent inside the vessel 2, the control means being adapted for receiving the measurement obtained on the scale 6 continuously and for determining the amount of bonding agent supplied towards the evacuation region 5 depending on the measurements received from the scale 6.
  • the control means can have the mass of the vessel 2 stored therein, so the mass of the bonding agent that is being ejected or that is ejected from the vessel 2 can easily be obtained taking into account the stored mass of the vessel 2: the mass of the vessel is subtracted from the received measurements and the result will yield the mass of the bonding agent.
  • control means are able to identify the mass of the bonding agent that is supplied or that is being supplied by subtracting the value of the measurement that it receives from this initial value.
  • the amount of bonding agent that is being supplied is therefore controlled in real time based on the mass thereof, and a very precise supply measurement is obtained.
  • Another simple way of being able to know the mass of the bonding agent that is supplied does not require knowing the mass of the vessel 2 beforehand; it is enough to compare both masses detected by the scale 6 (the initial mass and the mass detected at the current time during the supply). To that end, it is necessary to know the combined mass of the vessel 2 / bonding agent before starting the supply, and this can be known either by means of an initial weighing and/or by knowing the amount of bonding agent that is being loaded in the vessel 2 in the loading step beforehand, such as pre-establishing a maximum load of the bonding agent in the vessel 2 (maximum filling of the vessel 2 with bonding agent), for example. For safety's sake, even though an initial mass can be pre-established, it is preferable to perform an initial weighing to obtain this information.
  • FIG. 2 schematically shows a second embodiment of the apparatus 100, which is analog to the first embodiment but further comprising an absorption valve 8 arranged between the conveying unit 3 and the inlet 1 and an ejection valve 9 arranged between the conveying unit 3 and the evacuation region 5.
  • the absorption valve 8 preferably allows the flow-through passage of bonding agent in a single direction, specifically from the inlet 1 towards the conveying unit 3.
  • the absorption valve 8 is communicated with the control means and, as it is controlled by the control means, it is adapted for allowing the flow-through passage of bonding agent only when the conveying unit 3 is acting for loading the vessel 2 with bonding agent.
  • the absorption valve 8 can correspond to a passive check valve or an equivalent element.
  • the ejection valve 9 preferably allows the flow-through passage of bonding agent in a single direction, specifically from the conveying unit 3 towards the evacuation region 5.
  • the absorption valve 8 is communicated with the control means and, as it is controlled by the control means, it is adapted for allowing the flow-through passage of bonding agent only when the conveying unit 3 is acting to discharge or evacuate bonding agent from the vessel 2.
  • the ejection valve 9 can correspond to a passive check valve or an equivalent element.
  • the apparatus 100 is analog to the apparatus of the second embodiment and further comprises safety means for the purpose of anticipating possible problems derived from excess pressure inside the vessel 2, which are associated with the vessel 2 and are adapted for detecting the pressure inside the vessel 2.
  • An upper limit pressure value which can be two bars, for example, is previously established, and the safety means are adapted for reducing the pressure inside the vessel 2 if it has been detected that this pressure is equal to or exceeds the upper limit value.
  • the safety means comprise a pressure controller 101 which is adapted for responding when the pressure detected inside the vessel 2 is equal to or greater than the upper limit value. Exceeding the upper limit pressure value can lead the vessel 2 breaking, so this breaking can be anticipated and prevented as a result of the pressure controller 101.
  • the pressure controller 101 corresponds to a valve that is tared to approximately the previously established upper limit pressure value, such that when the pressure inside the vessel 2 is equal to or greater than this upper limit value, the valve opens and allows at least part of the air, bonding agent and/or mixture of air and bonding agent present inside the vessel 2 to be evacuated from the vessel 2 there through, the pressure inside the vessel 2 therefore being reduced.
  • the pressure controller 101 can correspond, instead of to a valve, to any element or device that performs the same function as the valve.
  • the container 2 comprises a hole for allowing the evacuation of air, bonding agent and/or mixture of air and bonding agent present in the vessel 2, and the pressure controller 101 is communicated with the hole directly or, preferably, through a conduit 21.
  • the supply source 200 is outside the apparatus 100, but in any of its embodiments said apparatus 100 can comprise an internal supply source instead of being connected to an external supply source.
  • a second aspect of the invention is related to a machine adapted for manufacturing sand cores and comprises a dosage apparatus 100 such as the one discussed for the first aspect of the invention in any of its embodiments.
  • a third aspect of the invention is related to an operating method adapted for being implemented in an apparatus according to the first aspect of the invention in any of its embodiments.
  • the method comprises a loading step in which bonding agent is loaded in the vessel 2 of the apparatus 100 through the conveying unit 3, and a supply step in which at least part of the bonding agent present in the vessel 2 is discharged towards the evacuation region 5 of the apparatus 100 so that it can be supplied through the conveying unit 3 to a machine adapted for manufacturing the sand core.
  • the amount of bonding agent that is supplied during the discharge of said agent from the vessel 2 is determined in the supply step based on the mass thereof, and the discharge is stopped depending on said determination. The determination is performed continuously in real time, the amount of bonding agent that is being supplied being controlled at all times.
  • the apparatus 100 comprises at least one scale 6 which allows obtaining the mass of the bonding agent that is supplied, and one scale 6 or another can be selected depending on the precision needs of the supply, for example. Therefore, in order to obtain a sand core the bonding agent can be supplied in a simple and easy manner, and in the most precise manner required.
  • the scale 6 continuously detects the sum of the masses of the vessel 2 and of the bonding agent present inside the vessel 2 in real time, and this information reaches the control means which determine the supplied amount of bonding agent depending on said information.
  • the explanation given in relation to the first aspect of the invention concerning different ways of obtaining the mass of the bonding agent depending on this information is also valid for the third aspect of the invention, so it is not repeated.
  • the supply step ends when the difference between the initial mass of the bonding agent in the vessel 2 at the beginning of the discharge (of the supply) and the mass of the bonding agent in the vessel 2 that is being detected at that time is substantially equal to the required amount of bonding agent.
  • the initial mass corresponds to the combined mass of the vessel 2 - bonding agent initially present in the vessel 2 or to the difference between the mass of the vessel 2 and the combined mass of the vessel 2 - bonding agent initially present in the vessel 2
  • the current mass corresponds to the detected combined mass of the vessel 2 - bonding agent present at that time in the vessel 2 or to the difference between the mass of the vessel 2 and the combined mass of the vessel 2 - bonding agent present at that time in the vessel 2.
  • the supply step is preferably divided into at least two phases.
  • a first phase the bonding agent is evacuated from the vessel 2 at a first speed
  • a second phase the bonding agent is evacuated from the vessel 2 at a second speed less than the first speed.
  • the supply is performed through the conveying unit 3 of the apparatus 100, and the control of the control means allows performing same at two different speeds.
  • the bonding agent is evacuated from the vessel 2 at the first speed until a predetermined amount of bonding agent less than the total required amount of bonding agent has been discharged, and at a second speed less than the first speed for discharging the remaining amount of bonding agent until the total required amount of bonding agent is reached.
  • the predetermined amount preferably corresponds to approximately between 85% and 95% of the total required amount.
  • a quick supply step is therefore obtained while at the same time precision of the supplied amount is maintained by ending with a lower speed.
  • the amount of bonding agent that is supplied at the second speed is established as a function of a balance between the desired quickness of the supply step and the required precision in the supplied amount, so it is normal for the smallest possible amount of bonding agent which allows precisely controlling the total supplied amount to be supplied at that speed.
  • the first speed will be the maximum speed at which it can be supplied, taking into account the elements present responsible for the supply and the control which is performed.
  • the method is also adapted for being implemented in a machine according to the second aspect of the invention in any of its embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP20130382178 2013-05-13 2013-05-13 Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung Withdrawn EP2803425A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20130382178 EP2803425A1 (de) 2013-05-13 2013-05-13 Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung
PCT/EP2014/059608 WO2014184124A1 (en) 2013-05-13 2014-05-12 Dosage apparatus and operating method for a dosage apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20130382178 EP2803425A1 (de) 2013-05-13 2013-05-13 Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung

Publications (1)

Publication Number Publication Date
EP2803425A1 true EP2803425A1 (de) 2014-11-19

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EP20130382178 Withdrawn EP2803425A1 (de) 2013-05-13 2013-05-13 Dosierungsvorrichtung und Betriebsverfahren für eine Dosierungsvorrichtung

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EP (1) EP2803425A1 (de)
WO (1) WO2014184124A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7246462U (de) * 1974-05-30 Michel H Vorrichtung zum Dosieren der Bindemittelzugaben bei der Herstellung von Sandformen und -kernen für Giessereizwecke
DE3245940A1 (de) * 1981-12-18 1983-07-07 Lüber, Werner, 9606 Bazenheid Dosierungseinrichtung fuer eine kernsand-aufbereitungsanlage
CH655451A5 (en) * 1982-01-27 1986-04-30 Werner Lueber Catalyst metering device
US4828461A (en) * 1986-10-18 1989-05-09 Dipl. Ing. Laempe Gmbh Apparatus for metering flowable materials in sand core making machines
EP0564013A1 (de) * 1992-03-30 1993-10-06 Casco Nobel Ab Verfahren zum Dosieren von Leimkomponenten
US20090087319A1 (en) * 2007-09-27 2009-04-02 Liquidynamics, Inc. Pump system including a variable frequency drive controller

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7246462U (de) * 1974-05-30 Michel H Vorrichtung zum Dosieren der Bindemittelzugaben bei der Herstellung von Sandformen und -kernen für Giessereizwecke
DE3245940A1 (de) * 1981-12-18 1983-07-07 Lüber, Werner, 9606 Bazenheid Dosierungseinrichtung fuer eine kernsand-aufbereitungsanlage
CH655451A5 (en) * 1982-01-27 1986-04-30 Werner Lueber Catalyst metering device
US4828461A (en) * 1986-10-18 1989-05-09 Dipl. Ing. Laempe Gmbh Apparatus for metering flowable materials in sand core making machines
EP0564013A1 (de) * 1992-03-30 1993-10-06 Casco Nobel Ab Verfahren zum Dosieren von Leimkomponenten
US20090087319A1 (en) * 2007-09-27 2009-04-02 Liquidynamics, Inc. Pump system including a variable frequency drive controller

Also Published As

Publication number Publication date
WO2014184124A1 (en) 2014-11-20

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