EP0800440B1 - Vorrichtung zum dosieren von körnigen, rieselfähigen materialien, insbesondere strahlmittel - Google Patents

Vorrichtung zum dosieren von körnigen, rieselfähigen materialien, insbesondere strahlmittel Download PDF

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Publication number
EP0800440B1
EP0800440B1 EP96938116A EP96938116A EP0800440B1 EP 0800440 B1 EP0800440 B1 EP 0800440B1 EP 96938116 A EP96938116 A EP 96938116A EP 96938116 A EP96938116 A EP 96938116A EP 0800440 B1 EP0800440 B1 EP 0800440B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
blasting
screw
blasting agent
helix
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.)
Expired - Lifetime
Application number
EP96938116A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0800440A1 (de
Inventor
Heinz Ruholl
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.)
Heinrich Schlick GmbH
Original Assignee
Heinrich Schlick GmbH
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 Heinrich Schlick GmbH filed Critical Heinrich Schlick GmbH
Publication of EP0800440A1 publication Critical patent/EP0800440A1/de
Application granted granted Critical
Publication of EP0800440B1 publication Critical patent/EP0800440B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0053—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0053—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
    • B24C7/0061—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier of feed pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0092—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed by mechanical means, e.g. by screw conveyors

Definitions

  • the invention relates to a beam device for machining workpieces or large ones Surfaces with a device for dosing granular, free-flowing abrasive according to the preamble of claim 1.
  • a device of the type mentioned is from the EP-A-0 578 132 known. Under a cauldron with Blasting media is filled, is a blasting media feed arranged.
  • the blasting agent feed consists of a Screw tube in which a dosing screw is arranged is.
  • the abrasive transported by the dosing screw falls through an arranged at the end of a delivery area Pipe.
  • a flow sensor is arranged on the pipe, the recorded measurement signals of an evaluation unit feeds.
  • the evaluation unit evaluates the measurement signals and compares the evaluation result with target values. With The speed of rotation is evaluated using the evaluation results the dosing screw.
  • a cleaning device is known from US Pat. No. 2,365,250 is known in which under a blasting agent supply A mixing element is arranged in the blasting medium hopper.
  • the Mixing element consists of a transverse and a longitudinal bore, which are connected to a mixing chamber.
  • the bore is fitted with a nipple Tip behind the junction of the cross hole and so that it is arranged outside the mixing chamber and so ends before an adpater.
  • With the adapter is one Pipe with a relatively large inside diameter connected.
  • the disadvantage is that the flowing into the mixing chamber Compressed air here is only a vacuum compared to that in the Blasting material flowing into the mixing chamber is generated. By the The blasting material is sucked in vacuum and into the pipe pressed. To support the funding performance of the Mixing chamber, the longitudinal bore must face downwards because the delivery pressure exerted on the line is so small that the length of the line and thus the Effect of the blasting material is limited. So that Abrasive can have its cleaning effect at least steam is added.
  • GB-A-2 182 628 discloses a shot peening device known, which comprises a screw conveyor with an inlet, that with granular medium over a funnel is supplied.
  • the screw conveyor is operated using a Stepper motor driven to feed into the inlet Medium with a precisely regulated speed to advance to an outlet pipe.
  • the engine will regulated by a computer so a programmed Flow rate exits the outlet line.
  • a capacitive Proximity switch is provided in the outlet line to determine if the outlet is blocked.
  • EP-A-0 218 869 is a device for even dosing of granular abrasive pneumatically working abrasive systems known.
  • This device is a blasting agent in a closed pressure-resistant boiler kept in stock. Under a Discharge hopper of the boiler, a screw conveyor is arranged, which are in a horizontal worm tube turns. The receiving area of the screw conveyor is captured Abrasive and there is to the delivery area from. The screw tube is at its end with a pipe connected, into which the abrasive entered becomes. Since the pipeline is pressurized with compressed air, the abrasive is carried away to the conveyor circuit stream and led to the jet nozzle. To even out the dosing blasting media is a device for compensation of the pressure gradient from the inside of the closed Boiler to the inside of the screw tube up to the delivery line intended.
  • the task therefore is a beam device the above-mentioned are to be further developed so that all Material configurations are processable and each Make the material fully effective can.
  • this object is achieved by a beam device solved with the features of claim 1.
  • the advantages achieved with the invention are in particular in that the material, especially the blasting agent, effectively mixed with the incoming compressed air becomes. This causes a different material concentration avoided at the jet nozzle. Besides, will every single grain of material "exposed” and under fed to the jet nozzle at high speed.
  • By the adjustability of the driving nozzle allows the mixing chamber adapt to different materials. Depending on the driving nozzle becomes the material to be used either further into or further out of Mixing chamber turned out. This will make for a changeable Mixing chamber catered for.
  • the nozzle section conveyor insert ensures that the material-compressed air mixture a high beam velocity is given.
  • the division of the nozzle section conveyor insert into the nozzle section and the adjoining one Mixing tube ensures forwarding of the manufactured in the mixing room Material-compressed air mixture with the corresponding Speed to the jet nozzle.
  • the optional positioning of the dosing screw enables it, granular, free-flowing materials all Convey configurations.
  • the slope of the two-speed helix can be trained in two ways his. The slope increases in the first type of training the two-speed screw spiral from the two-speed spiral pitch end while reducing the size of the first sections continuously. In the second embodiment takes the pitch of the two-speed helix from the beginning of the pitch to the end of the spiral slope under enlargement from second sections continuously.
  • the dosing screws can be in the screw tube from the two-speed spiral slope start to the two-speed spiral slope end can be rearranged under the reception area his.
  • the blasting medium is compressed and favors even dosing in the dispensing area.
  • one dosing screw becomes the second Embodiment with the two-speed spiral pitch start positioned under the recording area.
  • the slope from the first Embodiment of the dosing screw is achieved in that the incoming flour-like material, especially blasting media on the narrower sections of the dosing screw falls. Due to the now continuously increasing The material lies in sections of the two-speed helix always flatter in the individual sections, so that existing clumps are safely removed. It is of particular importance that this results in special Blasting media used effectively for fine blasting work can be. It is of particular advantage addition, that with the repositioned slope the two-speed screw spiral contains all of the abrasive effectively "wash out".
  • a pressure compensation line with the boiler, a pressure equalization line connection of the Abrasive feed and the driving nozzle of the mixing chamber connected is.
  • the pressure compensation line ensures a even flow of the material, especially Abrasive.
  • the Chamber back wall a threaded ring can be arranged with an external thread on the driving nozzle is adjustable is.
  • the material connection point between downpipe and Chamber pipe can be designed as a connecting piece. This ensures that the incoming Blasting media in free fall further into the mixing room Mixing chamber can fall.
  • the material interface between downpipe and chamber tube can also be used as Material feed double funnels are formed. This is a deliberate concentration of the Downpipe of incoming material possible. The closer the Cross section from funnel entrance to funnel exit the more material concentration becomes possible.
  • the Use of the double funnel also causes a dosing function.
  • the blasting agent dosage drops via the dosing screw, can be used for one Transition time made a dosage.
  • Driving nozzle can be arranged interchangeably.
  • An injector sluice describes, which consists of four parts.
  • a propellant nozzle which is followed by a mixing chamber.
  • In the Mixing chamber expands the one emerging from the motive nozzle Driving jet conical before entering a mixing tube flows in.
  • a subsequent one Nozzle section is the kinetic formed Energy of the air converted into pressure. Is the back pressure low in a subsequent delivery line the injector sluice act as a suction-pressure injector.
  • the injector sluice is only used as a pneumatic conveyor system for conveying conveyed goods used from containers.
  • Suction-pressure conveyors can remove grain from ships unloaded, conveyed PE powder or Foam polystyrene beads and styrofoam are promoted.
  • the injector sluice is as described cannot be used for blasting systems.
  • FIG. 1 A beam device according to the invention is shown in FIG. 1 shown.
  • the abrasive feed is made, as is the detail 5a and 5b show, from a screw tube 66 and a dosing screw 60, 60 'rotating therein.
  • the Dosing screw 60 carries on a screw shaft 61, the is connected to a rotating shaft 61 ', screw spirals 65 and 65 '.
  • the helical coils 65 and 65 ' are integrally connected to the worm shaft 61.
  • the screw spirals 65, 65 ' are at the beginning of the two-turn spiral pitch 70, 70 'relatively large compared to those at the two-speed spiral pitch end 71, 71 '.
  • D1 and D2 are defined.
  • Limit the helixes 65 and 65 ' a helix distance between them 63.1, ... 63.n. It is used in a metering screw 60 according to FIG. 5a with decreasing slope and decreasing diameter from D1 to D2 getting narrower in the conveying direction.
  • the Screw spiral spacing 63'.1, ... 63'.n always larger.
  • the metering screw 60, 60 'of the abrasive feed 6 is driven by a DC motor 7.
  • the DC motor 7 is with a gear or Thyristor control or designed as a geared motor.
  • the DC motor 7 is one Speedometer 8 connected. This ensures that the Speed of the dosing screw 60 continuously and with the set Number of revolutions with an almost 100% Synchronous movement is movable.
  • a downpipe 28 is arranged on the pipe connection 69. It exists from a lead section 9 to which a flow sensor 10 connects. After the flow sensor 10 a wake 11 is arranged.
  • the flow sensor 10 uses a for a measured value recording Measured value capacitor.
  • the absolute change in capacity caused by solid particles of the abrasive 30 per room unit in the measuring capacitor - compared to the previously measured empty tube capacity is proportional for abrasive throughput.
  • the through the abrasive throughput induced change in capacity is in a Interference-free pulse frequency modulation signal converted and a connected correlator 25 passed. With the Correlator 25 a blasting agent selection S1, ... S8 is connected.
  • control unit 24 has the possibility these eight different blasting media 30 automatically on the blasting agent control 25.
  • the Control unit 24 is still with a Syslin controller connected.
  • the syslin controller 26 is a microprocessor controlled Universal controller for controlled systems. He is also with the Correlator 25 and over one 4-quadrant controller 22 with the DC motor 7 connected.
  • the 4-quadrant controller 22 is above one Transformer 23 on network N. It should be emphasized that the Syslin controller immediately when starting to the specified setpoint, so that the irradiation time reduced by approx. 35 s.
  • the mixing chamber 12 is shown in detail in FIGS. 2 and 3 reproduced. It consists of a chamber tube 123 which is a connector 125 with which the Trail section 11 of the downpipe 28 directly connected is. At one end, the chamber tube 123 is one Chamber rear wall 130 closed. On the back wall of the chamber 130 is a threaded ring 122 positioned. By the Threaded ring 122 and the chamber rear wall 130 is one adjustable propellant nozzle 121 out. To be a stepless To ensure adjustment, she carries on her Outside an external thread 122 '. To replace the To be able to facilitate the driving nozzle after wear is the chamber rear wall 130 with locking screws 133, 4 also shows, can be detached from the chamber tube 123.
  • a nozzle section conveying insert 124 is arranged from the opposite end of the chamber tube 123, to which a blasting hose 13 with a blasting nozzle 14 is connected. In order to facilitate replacement after wear, the nozzle section conveying insert 124 is detachably connected to the vacuum tube 123.
  • the mixing space 126 can through the changeable propellant nozzle 121 can be adjusted. It is designed so that the Outflow losses are kept at zero. Thereby it is possible to convert the full pressure into speed energy to implement.
  • In of the section of the mixing tube 128 following the nozzle section 127 good mixing of the compressed air and the blasting medium 30, so that a compressed air blasting agent mixture the mixing chamber 12 leaves that at high speed reaches the jet nozzle. Through this mixing it is ensured that every grain of the abrasive is full can come into its own.
  • the driving nozzle 121 of the mixing chamber 12 is on a compressed air line 29 connected.
  • the compressed air line 29 is also via a ventilation valve 18 Boiler 1 and a further ventilation valve 19 and an adjoining air throttle 21 the upper Boiler 2 connected.
  • One after the branch to the boiler 2 vent valve arranged in the compressed air line 29 secures the area of the other lines yourself.
  • a compressed air connection 17th installed, which is guided via a pressure regulator 15. With the help of a manometer 16, the pressure in the Driving air flowing compressed air measurable.
  • a pressure gauge 16 ' measures the pressure from the compressed air connection 17 incoming compressed air.
  • the pressure compensation line 28 ensures that at all points where blasting medium 30 flows there is an equal pressure. This prevents due to possible air movements secondary blasting media is promoted.
  • Abrasive damper 30 is used in the given upper boiler 2.
  • the blasting agent 30 flows thereby to the funnel-shaped outlet of the boiler 2 and enters the inside of the butterfly valve 3 lower boiler 1.
  • the inflowing abrasive exceeds the measuring chamber of the min filling probe 5 and thereafter that of the Max filling probe 6. Is the measuring point of the Max filling probe 4 exceeded, the Flap 3 closed.
  • the blasting process begins by opening the butterfly valve 3 ". Here blasting agent 30 flows onto the blasting agent feed 6 to.
  • the blasting agent 30 arrives at a position as shown in FIG. 5a Dosing screw 60 over the boiler connection piece 67 on the two-speed spiral slope beginning 70. Corresponding to the speed of the dosing screw 60 and conditionally through the first wider section 64.1 becomes through the rotation the abrasive into the subsequent ones Sections up to section 64.n forward (in Fig. 5a to the left).
  • you arrive at the end of the two-turn helix 71 starts in the last sections 64 already exit the blasting agent, then in the last section of the dosing screw then completely to leave.
  • the conical taper of the dosing screw 60 at the end ensures an even leak the two-speed helix 25, 25 '.
  • an aluminum oxide 320 is used, which is hygroscopic and moreover not because of the floury structure is free-flowing, it comes with a positioning of the Dosing screw 60 according to FIG. 5a to clump the Abrasive 30. That on the broader sections 61, ... impinging aluminum oxide 320 becomes with decreasing Volume increasingly compressed towards sections 64.n, so that at the two-speed spiral slope end 71st form contiguous stripes by the rotation the dosing screw 60 falling off as lumps this constellation in no way for further processing own.
  • the dosing screw 60 is removed and that already described and shown in Fig. 5b Dosing screw 60 'used.
  • the sections are becoming larger and larger the rotating dosing screw 60 'here the loosening and pulverization, d. H. separating the individual Grains of aluminum oxide from a coherent Heap.
  • Due to the widening sections from 64'.1 to 64'.n the aluminum oxide 320 is used Blasting agent 30 drawn further and further apart the bottom of the screw shaft 61 of the metering screw 60 '. Connected to the rotary movements of the dosing screw separating the individual grains from each other.
  • the positioned and isolated blasting agent 30 arrives to pipe connection 69.
  • the blasting agent falls 30 in free fall through the downpipe 28.
  • the reverse slope of the metering screw 60 'the aluminum oxide 320 is unclumped given an even flow.
  • the blasting agent 30 receives a corresponding one steady speed.
  • the flow sensor 10 becomes a corresponding measured value signal generated by the change in capacity and to the blasting agent control via the blasting agent adjustment controller passed on. This represents according to the choice of abrasive and other parameters the dosing screw 60 so that the required amount of abrasive in the material supply port 125 of the mixing chamber 12 reaches, then freely again in the mixing room 126 fall.
  • the blasting agent 30 from the Compressed air emerging from the driving nozzle 121 is entrained and in the nozzle section 127 of the nozzle section conveying insert 124 given. Received in the nozzle section 127 the compressed air and the abrasive are necessary Speed by the position of the propellant nozzle 121 can be regulated in the mixing room 126. In that subsequent mixing tube 128 are abrasive and Compressed air swirled effectively. Since none laminar, but a turbulent flow in this Section is in place to ensure that each Grain of the abrasive 30, even if it is the negative flow properties of alumina 320 is fully isolated. The compressed air blasting agent mixture arrives with a very high and as already explained by the position of the driving nozzle 121 adjustable speed from the jet nozzle 14.
  • the pressure compensation line 27 ensures that in Boiler 1, the blasting agent feed 6 and the blasting chamber 12 there is the same pressure. Takes the abrasive ab, it can be done without interrupting the blasting process by opening the butterfly valve 3 from the upper boiler 2 be refilled.
  • the jet device is connected via a flushing connection 32 "flushed" with compressed air.
  • the dosing screw 60 is positioned in the screw tube 66 in such a way that the two-speed spiral pitch end 71 opposite the boiler connection piece 67 and the two-turn spiral pitch start 70 positioned on the pipe connection 69 is. This will - just like with the dosing screw 60'- achieved that during the rinsing process used compressed air no resistance becomes.
  • the reverse position promotes Slope of the two-speed helix 65, 65 'die Purge effect of the compressed air, so that it is ensured that all remnants of the previous abrasive 30 also the dosing screw 60 are removed. It is always then important if flour-like abrasives are used come. Even if the individual sections are reversed positioned dosing screw are getting wider, abrasive residue can stick in corner areas. The effective rinsing with compressed air prevents mixing these residues with another abrasive different configuration and thus secures the Reproducibility of the individual beam values.
  • a test run is carried out before using a new abrasive 30 carried out.
  • the dosing screw 60 or 60 'inserted and their expected speed of rotation is preset.
  • the propellant nozzle is in the correct position brought to the mixing room 126 the desired size to give for driving the blasting medium 30. Is the correct position of the driving nozzle 121 has been determined, it is locked so that it is in series production no adjustments can occur.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Catching Or Destruction (AREA)
EP96938116A 1995-11-06 1996-11-06 Vorrichtung zum dosieren von körnigen, rieselfähigen materialien, insbesondere strahlmittel Expired - Lifetime EP0800440B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19541228A DE19541228C2 (de) 1995-11-06 1995-11-06 Vorrichtung zum Dosieren von körnigen, rieselfähigen Materialien, insbesondere Strahlmittel
DE19541228 1995-11-06
PCT/EP1996/004851 WO1997017169A1 (de) 1995-11-06 1996-11-06 Vorrichtung zum dosieren von körnigen, rieselfähigen materialien, insbesondere strahlmittel

Publications (2)

Publication Number Publication Date
EP0800440A1 EP0800440A1 (de) 1997-10-15
EP0800440B1 true EP0800440B1 (de) 2001-07-25

Family

ID=7776688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96938116A Expired - Lifetime EP0800440B1 (de) 1995-11-06 1996-11-06 Vorrichtung zum dosieren von körnigen, rieselfähigen materialien, insbesondere strahlmittel

Country Status (10)

Country Link
US (1) US6000995A (enExample)
EP (1) EP0800440B1 (enExample)
JP (1) JPH10512502A (enExample)
KR (1) KR100399697B1 (enExample)
AT (1) ATE203447T1 (enExample)
CA (1) CA2189201A1 (enExample)
DE (2) DE19541228C2 (enExample)
ES (1) ES2162109T3 (enExample)
PT (1) PT800440E (enExample)
WO (1) WO1997017169A1 (enExample)

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EP4397437A1 (de) 2023-01-03 2024-07-10 Freymatic AG Strahlmaschine, dosiereinrichtung für strahlmaschine, sowie verwendung der strahlmaschine

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CN106737232A (zh) * 2017-03-22 2017-05-31 南京航空航天大学 一种精确送砂装置及送砂方法
TWI639403B (zh) * 2017-04-13 2018-11-01 美商凱亞科技股份有限公司 咖啡豆運送裝置
JP7200924B2 (ja) * 2019-12-27 2023-01-10 新東工業株式会社 ショット処理装置及びショット処理方法
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4397437A1 (de) 2023-01-03 2024-07-10 Freymatic AG Strahlmaschine, dosiereinrichtung für strahlmaschine, sowie verwendung der strahlmaschine

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DE59607361D1 (de) 2001-08-30
ATE203447T1 (de) 2001-08-15
US6000995A (en) 1999-12-14
JPH10512502A (ja) 1998-12-02
ES2162109T3 (es) 2001-12-16
DE19541228A1 (de) 1997-05-15
KR100399697B1 (ko) 2004-02-11
EP0800440A1 (de) 1997-10-15
KR19980701240A (ko) 1998-05-15
WO1997017169A1 (de) 1997-05-15
CA2189201A1 (en) 1997-05-07
PT800440E (pt) 2002-01-30
DE19541228C2 (de) 1997-08-21

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