EP0229328A1 - Malaxeur double à mélange forcé pour projection continue et discontinue - Google Patents

Malaxeur double à mélange forcé pour projection continue et discontinue Download PDF

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Publication number
EP0229328A1
EP0229328A1 EP86117261A EP86117261A EP0229328A1 EP 0229328 A1 EP0229328 A1 EP 0229328A1 EP 86117261 A EP86117261 A EP 86117261A EP 86117261 A EP86117261 A EP 86117261A EP 0229328 A1 EP0229328 A1 EP 0229328A1
Authority
EP
European Patent Office
Prior art keywords
mixing
double
trough
shaft
compulsory 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
EP86117261A
Other languages
German (de)
English (en)
Other versions
EP0229328B1 (fr
Inventor
Rudolf Martinek
Johannes Oertel
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.)
BHS Bayerische Berg Hutten und Salzwerke AG
Original Assignee
BHS Bayerische Berg Hutten und Salzwerke AG
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=6288174&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0229328(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BHS Bayerische Berg Hutten und Salzwerke AG filed Critical BHS Bayerische Berg Hutten und Salzwerke AG
Priority to AT86117261T priority Critical patent/ATE66383T1/de
Publication of EP0229328A1 publication Critical patent/EP0229328A1/fr
Application granted granted Critical
Publication of EP0229328B1 publication Critical patent/EP0229328B1/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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/702—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with intermeshing paddles

Definitions

  • the two shafts are in turn driven in opposite directions.
  • the orientation of the mixing tools on the two shafts is such that the mixing tools of the one shaft convey in a first direction and the mixing tools of the second shaft in the opposite direction, so that the result is a circular movement of the material to be mixed.
  • This mode of action creates a particularly intensive mixing of all mix components.
  • a work cycle is made up of: loading, mixing and emptying. The mixing process takes place with the floor discharge opening closed and the mixing duration can be selected.
  • a dual-shaft compulsory mixer designed in accordance with the invention can be designed with relatively little conversion measures so that it is equally suitable for batch operation and continuous operation, so that, depending on the quality and quantity requirements, a changeover from one mode of operation to the other mode of operation takes place at the place of use can be.
  • the axial distance between the point at which the feed means of the granular material and the discharge opening arrangement can be adjusted favorably by the discharge point of the feed means of the granular mixture components lying in the mixing trough in the region of the mixing shaft which conveys away from the end wall adjacent to the discharge opening arrangement. In this way, an extended path of the continuously conveyed mix is achieved.
  • Optimal mixing ratios for continuous operation in the sense of suppressing the migration of unmixed granular mixture components to the discharge opening arrangement can be achieved if the feed of the feeding means of the granular mixture components is at a distance from the end wall remote from the discharge opening arrangement, which is approximately 30 to 70% the clear length of the mixing trough in the mixing shaft direction.
  • the feed means for liquid mixture components are arranged approximately along the entire batch circulation path within the mixing trough, and that for the continuous operation the liquid outflow from the feed means can be limited to a partial extent of the batch circulation path along an end wall and along the mixing shafts, in particular on the partial circumference from the point at which the feed means of the granular mix component to a point in front of the discharge opening arrangement.
  • the double-shaft compulsory mixer can also be adapted to the mode of operation with a simple changeover measure with regard to the liquid requirement.
  • the proposed restriction of the liquid supply to part of the batch recirculation path is advantageous because it can prevent unmixed liquid from escaping.
  • the changeover from batch operation to continuous operation becomes particularly easy when the feed means for the liquid mixed material components consist of two separately supplied U-tubes with liquid delivery points distributed over their length, which are arranged above the mixing shafts, with a first one intended for continuous operation U-tube - viewed in plan view - runs approximately along the mixing shaft axes and along the end wall remote from the discharge opening arrangement, and a second U-tube supplements the first U-tube to form an approximately closed loop.
  • the feeding means for the granular mixture components comprise a separate feeding point, in particular an inlet funnel, for batch feeding, namely between the two mixing shafts and preferably in the longitudinal center of the mixing trough between the two end walls.
  • the two mixing units are equipped with a reversing device at the end at which the movement of the batch of material caused by them hits an end wall, which the material to be mixed is deflected along the respective end wall towards the other mixer.
  • a baffle element In order to be able to influence the circulating movement of the batch of material in the mixing trough, it is possible for a baffle element to be arranged in the circulation path of the batch of material in front of the discharge opening arrangement, in a rigid or adjustable manner, for example by pivoting or pulling out.
  • This dam element can be provided with openings of any number, shape and size. This damming element is particularly advantageous for the continuous mode of operation in order to be able to regulate the discharge.
  • the discharge opening arrangement can be designed with a single or double flat slide closure, but also with a single or double flap closure or also with a segment closure.
  • a single or double flap closure is also an alternative to the rotary slide closure in view of the large length.
  • This fill level control can measure the batch size or the fill level by means of a batch size signal transmitter, in particular a fill level probe, and correct deviations from a target size by changing the mix component loading and / or the mix exit.
  • the double-shaft compulsory mixer for continuous and / or discontinuous operation essentially consists of a mixing trough 1 with at least one elongated, rectangular bottom emptying opening 2 arranged at the bottom in the longitudinal direction yy, which can be opened or closed via an emptying closure 9 and over most of the length of the floor.
  • a discharge opening arrangement 3 is arranged transversely to the longitudinal direction y-y in a squat, rectangular shape below in the mixing trough, near the trough end wall l2 and can also be opened or closed via an emptying closure l0.
  • the two drainage closures 9 and 10 together take up almost the entire length of the bottom.
  • mixers 5 and 6 are provided, the horizontal shafts 4 of which are mounted on both sides outside the trough end walls l2 and l3 in bearings 8 and via a z. B. arranged on one side mixer drive 7 synchronously in the opposite direction of rotation x be driven.
  • Both mixers 5 and 6 are paddle mixers which consist of a transport and mixing device, that is to say a plurality of mixing arms 14 with mixing paddles 15 and a reversing device, that is to say of at least one clearing arm 16 with a reversing tool, namely a clearing blade 17, and each on a mixing shaft 4 are fastened, the mixing blades l5 having the same direction, but left-handed spiral, the clearing blades 17 being arranged opposite, that is to say right-handed.
  • each mixing unit in the area of the storage zone A near the trough end walls l2 and l3 is equipped with at least one clearing arm l6, one of which clearing bucket l7 arranged in an oppositely increasing manner, which transports the jammed mix out of the accumulation zone A to the suction zone B and thereby gives the mix a deflection movement component away from the associated end wall l2, l3.
  • This process also substantially supports the circulating mix movement z and keeps it flowing.
  • a so-called storage plate 11, rigid or adjustable, can be swung out or pulled out, which, depending on the requirement, also has openings 18 can be provided in any number, shape and size.
  • the circulating mix movement z can be additionally slowed down as required with the aim of increasing the residence time or throughput time of the mix in the mixing trough.
  • a covering hood 19 is arranged above the mixing trough 1, in which at least two inlet funnels 20 and 21 for the addition of the granular mixture components and two U-shaped pipes 22 and 23 for the addition of the liquid mixture components are arranged.
  • the inlet funnel 20 is attached to a defined feed point above the longitudinal axis of the mixer 6. This ensures that with continuous operation the mixing process between the paddle mixers 5 and 6 takes place over a long transport path, starting at the feed point E and ending at the emptying point F.
  • a second one The funnel 21 can be arranged in the middle area of the mixing trough between the paddle mixers 5 and 6, in order to be able to add the granular mixing material components in the middle of the trough, with the aim of reducing the mixing time and increasing the mixer throughput, in the case of discontinuous operation and difficult to mix materials.
  • L o is the distance from the center E to the mixing trough front wall 13; L is the inner length of the mixing trough 1 between the end walls 12 and 13.
  • the U-shaped pipelines 22 and 23 are provided with holes or nozzles 24 and with pipe connections 27 laid at any point to the outside, via which the liquid mixture components are supplied.
  • the legs of both U-shaped stirring lines are of different lengths.
  • the charging means 22 for the liquid mixed material components extend to a point L 1 which is approximately 50 to 85%, preferably approximately 75%, of the clear mixed tub length L. from which the discharge opening 3 remote end wall l3 is removed.
  • the U-shaped pipeline 22 is used in discontinuous operation.
  • any mix e.g. also concrete and mortar or mineral mixtures for hydraulically bound base layers for road construction in continuous or discontinuous mode of operation through the advantage of the circulating mixture movement in direction z with simultaneous mixture exchange between the two mixers 5 and 6 with high mixing quality.
  • both openings 2 and 3 remain closed while the mixing trough 1 is being filled.
  • the filling process is interrupted and the mixture introduced is completed within an adjustable pre-mixing time.
  • the continuous mode of operation is initiated by a regulated, continuous emptying of the material to be mixed with a simultaneous, coordinated continuation of continuous mixer loading.
  • this measure ensures a uniform, homogeneous mix from start to finish without the disadvantageous fluctuations in homogeneity during the filling phase, as is inherent in the known continuous mixing process.
  • the time for the material flow to be switched off after the filling phase can be controlled either via a timing relay, level probe or the load on the drive motor.
  • each continuous mixing process begins with the emptying phase or switching off the mixer feed.
  • the emptying phase takes place when the discharge opening arrangement 3 is open and lasts until the mixing trough is cleared. By additionally opening the bottom emptying opening 2, the complete emptying of the mixing trough can be accelerated.
  • the mixer works discontinuously, all granular and liquid mixture components are metered in batches, the granular components also being able to be added via the inlet funnel 20 or also via the second inlet funnel 2l. However, the liquid mixture components are to be metered simultaneously via the separate pipes 22 and 23. Depending on the requirements of the discontinuous mode of operation, the dust plate 11 can either be partially or completely pivoted out or be pulled out.
  • the mixing process takes place at any desired mixing duration and always with openings 2 and 3 closed.
  • openings 2 and 3 For emptying the mixing trough, it is preferable to use the bottom emptying opening 2, but it is also possible to empty both openings 2 and 3 at the same time in order to accelerate the emptying process .
  • the closure 9 for the bottom emptying opening 2 can be designed as a rotary slide closure or as a single or double flap closure, any opening positions being adjustable.
  • the closure 10 for the discharge opening arrangement 3 can be designed as a single or double flap closure, as a segment closure or also as a single or double flat slide closure, with the flat slide closure being able to have both flat slides offset in height from one another.
  • twin-shaft batch mixer can also be used to fall or rise in the longitudinal direction.
  • a start-up batch of granular mixing components is first entered through the funnels 20 and / or 2l.
  • the corresponding amount of liquid mix component is supplied through the U-tubes 22 and / or 23.
  • the two openings 2 and 3 are closed.
  • mixing is first carried out without removal, the mixing occurring especially in the area between the two shafts 4, where the mixing blades going upward cause turbulence to promote the mixing process.
  • the start-up phase ends.
  • Granular mixture components are now continuously fed through the feed hopper 20, possibly premixed or in parallel flows.
  • the discharge opening arrangement 3 is opened, to the extent that a quantity of mixed material is drawn off per time unit which corresponds to the mixed material components supplied per unit time.
  • liquid mixture components are continuously supplied through the U-tube 22.
  • the granular mix components can comprise fine powdery components up to coarse-grained components.
  • the mutual coordination of the supply of mixed material components through the hopper 20 and the tapping of mixed material through the discharge opening arrangement 3 is carried out by a control system, not shown, which ensures that the batch of mixed material stationary in the mixing trough remains constant. If there is temporarily no need for mixed material, the supply of mixed material components and the drawing off of mixed material can be temporarily stopped without the mixing units 5 and 6 being switched off.
  • the position of the inlet funnel 20 at the locations 4 ensures that a relatively long way is available for the mixed material components added through the inlet funnel 20 until the discharge opening arrangement 3 is reached in continuous operation.
  • the inlet funnel 20 should not be approached up to the immediate vicinity of the end wall l2, since in this case the cross-conveying action of the mixing blades l5 could lead to unmixed mixture components getting into the area of the mixer 5 and through its mixing blades on a too short remaining path to the Discharge opening arrangement 3 are transported.
  • the system If the system is to be shut down, it can be emptied gradually through the discharge opening arrangement 3 after the supply of the mixed material components has been switched off, or very much faster through the additional opening of the bottom emptying opening 2.
  • the mix components are preferably fed through the hopper 2l, which can be dimensioned so large that it can be loaded, for example, by means of a gripper. Basically, however, feeding through the inlet funnel 20 is also possible for discontinuous operation. Mixing takes place with openings 2 and 3 closed until the desired homogenization is achieved. The entire batch is then removed through the bottom emptying opening 2 and, if appropriate, additionally through the discharge opening arrangement 3.
  • the liquid mixed material components are preferably supplied only at the beginning of the same approximately simultaneously or immediately after the introduction of the granular mixed material component, namely by both U. -Tubes 22 and 23.
  • a particular advantage of the invention lies in the fact that one and the same system can be used both continuously and batchwise. Continuous work is carried out, for example, when mix material is continuously requested, for example on large trucks with a flying loading change, concrete pumps, etc. By appropriately coordinating the continuous supply of mix material and the continuous supply of mix material to the size of the stationary batch continuously circulated in the mixing trough for a qualitatively more or less high-quality mix. On the one hand, you can work with a high output, for example when you need a lean concrete for substructures, the quality of which is not subject to any special requirements, and on the other hand, you can also obtain a high-quality mix in continuous operation with a correspondingly lower throughput.
  • the discontinuous mode of operation will generally be used for the production of mixed material of the highest quality and, on the other hand, when the mixed material is required in batches, in large quantities per unit of time.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Direct Current Motors (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP86117261A 1985-12-11 1986-12-11 Malaxeur double à mélange forcé pour projection continue et discontinue Expired - Lifetime EP0229328B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117261T ATE66383T1 (de) 1985-12-11 1986-12-11 Doppelwellen-zwangsmischer fuer kontinuierliche und diskontinuierliche arbeitsweise.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853543745 DE3543745A1 (de) 1985-12-11 1985-12-11 Doppelwellen-zwangsmischer fuer kontinuierliche und diskontinuierliche arbeitsweise
DE3543745 1985-12-11

Publications (2)

Publication Number Publication Date
EP0229328A1 true EP0229328A1 (fr) 1987-07-22
EP0229328B1 EP0229328B1 (fr) 1991-08-21

Family

ID=6288174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117261A Expired - Lifetime EP0229328B1 (fr) 1985-12-11 1986-12-11 Malaxeur double à mélange forcé pour projection continue et discontinue

Country Status (6)

Country Link
US (1) US4775239A (fr)
EP (1) EP0229328B1 (fr)
JP (1) JPS62140633A (fr)
AT (1) ATE66383T1 (fr)
DE (2) DE3543745A1 (fr)
ES (1) ES2025554T3 (fr)

Cited By (2)

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WO2003097225A1 (fr) * 2002-05-17 2003-11-27 Bhs-Sonthofen Gmbh Ailette laterale, melangeur a arbre double dote d'une ailette laterale
CN110978267A (zh) * 2019-12-13 2020-04-10 周狄超 一种建筑装修用工程搅拌装置

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CA2650913C (fr) * 2009-01-23 2013-10-15 Sunopta Bioprocess Inc. Methode et appareillage de transport de produits de depart cellulosiques
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003097225A1 (fr) * 2002-05-17 2003-11-27 Bhs-Sonthofen Gmbh Ailette laterale, melangeur a arbre double dote d'une ailette laterale
CN110978267A (zh) * 2019-12-13 2020-04-10 周狄超 一种建筑装修用工程搅拌装置

Also Published As

Publication number Publication date
DE3681006D1 (de) 1991-09-26
DE3543745A1 (de) 1987-06-19
US4775239A (en) 1988-10-04
JPH048096B2 (fr) 1992-02-14
EP0229328B1 (fr) 1991-08-21
ATE66383T1 (de) 1991-09-15
ES2025554T3 (es) 1992-04-01
JPS62140633A (ja) 1987-06-24

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