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EP0726091A1 - Mélangeur à circulation - Google Patents

Mélangeur à circulation Download PDF

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Publication number
EP0726091A1
EP0726091A1 EP96101712A EP96101712A EP0726091A1 EP 0726091 A1 EP0726091 A1 EP 0726091A1 EP 96101712 A EP96101712 A EP 96101712A EP 96101712 A EP96101712 A EP 96101712A EP 0726091 A1 EP0726091 A1 EP 0726091A1
Authority
EP
European Patent Office
Prior art keywords
wall
guide tube
mixer according
loop
loop mixer
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
EP96101712A
Other languages
German (de)
English (en)
Other versions
EP0726091B1 (fr
Inventor
Herwig Burgert
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.)
DMT - GESELLSCHAFT FUER DOSIER- UND MISCHTECHNIK M
Original Assignee
BURDOSA Ing Herwig Burgert iK
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 BURDOSA Ing Herwig Burgert iK filed Critical BURDOSA Ing Herwig Burgert iK
Publication of EP0726091A1 publication Critical patent/EP0726091A1/fr
Application granted granted Critical
Publication of EP0726091B1 publication Critical patent/EP0726091B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
    • B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/92—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws
    • B01F27/921—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle
    • B01F27/9211—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle the helices being surrounded by a guiding tube

Definitions

  • the invention relates to a loop mixer for mixing a product containing solids, in particular fibers, with a cylindrical mixer housing which has an inlet and an outlet for the product and in which a mixing loop is formed with a cylindrical guide tube, in which the product from the inside of the Guide tube is deflected via a radial opening in front of a front end of the guide tube into an annular cylindrical outer space of the guide tube and is returned there in countercurrent and from which the product reaches the outlet by means of guide devices which are arranged on the outside of the guide tube and cross the radial opening to the outlet, for transporting the Product a rotating displacer is arranged inside the guide tube.
  • Loop mixers of this type are known as the applicant's "dynamic loop mixer” and have been used for many years. They offer the advantage that the mixing process can be carried out without dead space and a uniform mean throughput time for the product - and thus even mixing - through the accountings, which have a downstream inlet opening in the outside space and transport the mixed product to the regular outlet side opposite the inlet side, the guiding devices being required in order to transport the product at the radial opening and regardless of the product flow through the radial opening to the outlet. Accordingly, product flows around the guide devices in the region of the radial opening within the mixing loop. If the product contains solids, in particular fibers, these tend to accumulate on the outside of the guide devices and thus reduce the radial opening or have them completely clogged.
  • a loop mixer of the type mentioned at the outset is characterized in that, in the region of the radial opening, a rotating scraper tool is arranged radially in front of the guide devices, said tool having a radial wall with at least one wall section is provided, which is closed by an inclined edge so that the height of the wall changes.
  • the problem of clogging the loop mixer can thus be solved with the aid of a simple rotating tool which is designed in the form of a cylindrical wall and with the inclined edge of the at least one wall section presses the accumulated solids, in particular fibers, away from the guide devices so that the solids, in particular fibers, are grasped and taken away by the product stream flowing through the free cross section of the radial opening, that is to say they remain properly in the product circulating in the mixing loop.
  • the cleaning intervals for the loop mixer could be extended from a few hours to several days, that is to say normal cleaning intervals for loop mixers for non-clogging products, with a stripping tool designed and arranged according to the invention.
  • the wall section is triangular, a sawtooth shape, ie a triangle with a long flat slope and a short steep slope, is particularly preferred.
  • the maximum height of the wall section corresponds approximately to the greatest height of the radial opening.
  • the radial wall of the stripping tool is provided with two wall sections.
  • the scraper tool with the at least one wall section is cup-shaped with a bottom, the bottom of the scraper tool being arranged as a front end of the guide tube.
  • the speed of rotation of the rotating stripping tool is not critical.
  • the stripping tool can therefore have a common drive with the rotating displacer in a simple manner.
  • the rotating displacer is expediently a screw conveyor, so that the stripping tool is preferably attached to the drive shaft of the screw conveyor.
  • the inner wall of the guide tube has axially extended shoulders preventing the product from rotating with the displacer.
  • the inner wall can be formed from cylindrical wall sections arranged eccentrically to one another, between which the shoulders are formed.
  • FIG. 1 shows a mixer housing 1 which is essentially cylindrical and has an inlet 2 for the product to be mixed on one end face and an outlet 3 for the mixed product on the other end face.
  • a guide tube 4 Coaxial with the mixer housing 1 there is a guide tube 4, the length of which is shorter than the length of the mixer housing 1 in the cylindrical part, so that radial through openings 5, 6 are formed at both ends of the guide tube 4, through which the product from inside the Guide tube 4 in an annular cylindrical outer space 7 formed between guide tube 4 and mixer housing 1 and vice versa.
  • a rotating drive shaft 8 of a screw conveyor 9 is arranged in the axis of symmetry of the guide tube 4.
  • the amount of processed product exiting through outlet 3 corresponds to the amount of product pressed into the mixer through inlet 2.
  • Arrows P illustrate the product circulation in the mixing loop formed by the inner space and the annular cylindrical outer space 7 of the guide tube 4, as well as the supply of the product through the inlet 2 and the outlet of the product through the pipe sections 10 into the outlet 3.
  • a rotating scraper tool 13 is arranged according to the invention, which is cup-shaped with a bottom 14 and a radial wall 15.
  • the radial wall 15 rotates immediately in front of the radially inner end of the pipe sections 10, which are arranged on a common radius and serve as guide devices.
  • the bottom 14 forms a front end in the extension of the guide pipe 4 and at a distance from its end edge 16 on the output side.
  • the radial wall 15 is formed with two wall sections 17 which are provided with an inclined edge 18.
  • the inclined edge 18 leads from a small height H1 to a larger height H2.
  • a steeper inclined edge 19 leads back to the original height H1.
  • the stripping tool 13 is connected to the rotary shaft 8, that is to say rotates together with the screw conveyor 9. Due to the direction of rotation R, the product is pressed away laterally from the pipe sections 10 with the aid of the inclined edge 18. Solids contained in the product are therefore conveyed into the free area between the pipe pieces 10 and pass through the free area of the radial opening 5 with the product stream generated by the screw conveyor 9 into the ring-cylindrical outer space 7.
  • Figure 3 illustrates that the guide tube 4 has a not uniformly cylindrical inner wall 20, but that the inner wall 20 consists of four cylindrical sections 21 which are arranged eccentrically to one another and therefore form axially aligned shoulders 22.
  • This arrangement on the one hand prevents material from rotating with the rotation in the direction R of the screw conveyor 9, which would prevent the desired transport effect in the axial direction, on the other hand clogging of any grooves, circular openings or the like is prevented. avoided.
  • FIG. 4 illustrates in another embodiment of the wall of the guide tube 4 that the outer wall can also be graduated in accordance with the design of the inner wall 20 if this appears expedient for manufacturing reasons.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP96101712A 1995-02-09 1996-02-07 Mélangeur à circulation Expired - Lifetime EP0726091B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19504272A DE19504272C2 (de) 1995-02-09 1995-02-09 Schlaufenmischer
DE19504272 1995-02-09

Publications (2)

Publication Number Publication Date
EP0726091A1 true EP0726091A1 (fr) 1996-08-14
EP0726091B1 EP0726091B1 (fr) 2000-05-03

Family

ID=7753551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101712A Expired - Lifetime EP0726091B1 (fr) 1995-02-09 1996-02-07 Mélangeur à circulation

Country Status (3)

Country Link
EP (1) EP0726091B1 (fr)
DE (2) DE19504272C2 (fr)
ES (1) ES2150606T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109012350A (zh) * 2018-07-20 2018-12-18 广东鑫皇冠新材料有限公司 一种带清洁装置的粉末涂料搅拌机
CN109126549A (zh) * 2018-07-20 2019-01-04 广东鑫皇冠新材料有限公司 一种自动清洁的粉末涂料搅拌机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009647B4 (de) * 2008-02-18 2011-04-14 Christian Dr. Koch Schlammreaktorpumpe zur gleichzeitigen Förderung von Feststoffen, Flüssigkeiten, Dampfen und Gasen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132666A (en) * 1975-10-09 1979-01-02 Japan Synthetic Rubber Company, Limited Process for preparing alkali metal dispersions
EP0488183A1 (fr) * 1990-11-26 1992-06-03 KRAFT GENERAL FOODS R & D, INC., Zweigniederlassung München Dispositif et procédé pour la fabrication d'un mélange aseptique d'une substance fluide ou pateux avec des particules solides

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298117A (en) * 1970-07-30 1972-11-29 Gardeners Of Gloucester Ltd Improvements in or relating to mixing means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132666A (en) * 1975-10-09 1979-01-02 Japan Synthetic Rubber Company, Limited Process for preparing alkali metal dispersions
EP0488183A1 (fr) * 1990-11-26 1992-06-03 KRAFT GENERAL FOODS R & D, INC., Zweigniederlassung München Dispositif et procédé pour la fabrication d'un mélange aseptique d'une substance fluide ou pateux avec des particules solides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109012350A (zh) * 2018-07-20 2018-12-18 广东鑫皇冠新材料有限公司 一种带清洁装置的粉末涂料搅拌机
CN109126549A (zh) * 2018-07-20 2019-01-04 广东鑫皇冠新材料有限公司 一种自动清洁的粉末涂料搅拌机

Also Published As

Publication number Publication date
ES2150606T3 (es) 2000-12-01
DE19504272A1 (de) 1996-08-22
EP0726091B1 (fr) 2000-05-03
DE59605080D1 (de) 2000-06-08
DE19504272C2 (de) 1997-10-23

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