WO1987005542A1 - Crible a grande surface comportant deux caissons de tamisage - Google Patents

Crible a grande surface comportant deux caissons de tamisage Download PDF

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Publication number
WO1987005542A1
WO1987005542A1 PCT/CH1987/000030 CH8700030W WO8705542A1 WO 1987005542 A1 WO1987005542 A1 WO 1987005542A1 CH 8700030 W CH8700030 W CH 8700030W WO 8705542 A1 WO8705542 A1 WO 8705542A1
Authority
WO
WIPO (PCT)
Prior art keywords
plan sifter
box
cranks
boxes
sieve
Prior art date
Application number
PCT/CH1987/000030
Other languages
German (de)
English (en)
Inventor
Alois Keller
Christian Neuweiler
Original Assignee
Gebrüder Bühler 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
Application filed by Gebrüder Bühler Ag filed Critical Gebrüder Bühler Ag
Publication of WO1987005542A1 publication Critical patent/WO1987005542A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/38—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens oscillating in a circular arc in their own plane; Plansifters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens

Definitions

  • the invention relates to a large-scale plan sifter with two screen boxes arranged next to one another, which can be driven to form circular vibrations via a crankshaft drive.
  • the invention relates to large-scale sifters, large screening system units in which, for example, two to four screening compartments are arranged next to one another, each containing ten to thirty individual screens one above the other.
  • the striking feature of the large plan sifter lies in the considerable height dimension, which is in the range of conventional room closets, that is to say in the order of magnitude of 2 m in height.
  • the large loves for example in the field of rock-earth, which almost without exception have a large footprint.
  • a high vibrating body has different forces, especially in the case of cantilever chairs, compared to more flat-shaped vibrating structures. With a high vibrating structure, wobble forces are opposed to gyroscopic forces.
  • the well-known large plan viewers can be divided into three special types:
  • the type of cantilever chair is used almost exclusively in the large plan viewers currently used.
  • a swing weight of 0.5 to 1.0 t in the middle of all boxes is brought into a rotary movement, and the entire plan sifter is held as a closed unit in a corresponding circular movement.
  • the swing weight performs a real rotating movement, the box as a counter mass performs a rotation-free, circular (translational) movement.
  • the plansifters are hung on a number of elastic rods, distributed at four points. None prevents the plan sifters suspended by elastic rods from assuming a free vibration resulting from the play of the moving mass and counter mass.
  • a circular oscillation is aimed for, since only this ensures an even sieving work on each sieve in any direction of conveyance.
  • the individual screens can be loaded at any point and the screen repulsion and the screen passage can be removed at the opposite ends in any direction. What is essential in practice is insensitivity to asymmetrical loading of the various compartments. A good plansifter maintains a good circular motion even if it is loaded with product asymmetrically.
  • crank vibrator has not been offered for large-scale plans for a long time.
  • a classic crank vibrator is described in Swiss Patent No. 76,937.
  • Two separate sieve boxes arranged side by side are brought into a circular motion by a drive crank, which is assigned in the middle of both sieve boxes.
  • Each sieve box is assigned two non-driven guide cranks. Every box swings in an ideal circular shape at every point. No additional centrifugal masses are necessary.
  • the big disadvantage lies in the rigid guidance of both boxes. Any deviating force or disturbing moment must be taken over by the various cranks.
  • the cantilever can with disturbing forces by slightly changing the vibration shape during the disturbance time, or e.g. by "shifting" the lateral movement center so that no significant overload occurs for the construction elements.
  • load peaks fixed locally and in the direction occur, for example, at only one location on a bearing. Uncontrolled, local point loads usually result in premature damage to the bearings.
  • the crank vibrators for large-scale plansifers failed as a result of these problems. Even with overdimensioning, this basic problem cannot be eliminated.
  • the principle of the crank oscillator is only used today in the simplest form for small classifiers.
  • the actual cantilever chair can be used with the largest dimensions and has proven itself over decades. However, it has a large driving flywheel.
  • crank oscillator does not require a driving flywheel mass or a mass balance.
  • the object of the invention was now to develop a plan sifter with a box moving in opposite directions while largely avoiding the deficiencies of the known solutions, and in particular from a practical point of view, an arbitrary increase in the number of sieves should be possible, even compared to those used today Large-scale plansifters.
  • the solution according to the invention is characterized in that the screen box is carried over cantilever elements and has at least two driven cranks.
  • the plan sifter also reacts in the sense of a real cantilever by setting the circular paths from places with overload to places with underload in relation to the masses. Predictable stresses thus occur, namely on the box structure and the bearing points.
  • the local maximum load for the construction corresponds to that which is known for freely swinging plan sifters.
  • the new solution allows an unlimited enlargement of the plan sifter dimensions within the scope of what is technically feasible. It will be possible to build even larger plansifters than was previously possible with the system of pure cantilever chairs.
  • the invention now allows various, very particularly advantageous design ideas.
  • the two cranks are advantageously designed as double cranks.
  • a double crank allows the power to be transmitted at two locations. It is particularly advantageous if the two driven cranks each have a counter-swirl mass.
  • Practical tests with the new invention have shown that the large plan sifter has a very stable vibration behavior during operation.
  • the two sieve boxes assume an approximately elliptical vibration shape in extreme conditions. This is due to a not completely balanced reaction moment of the two boxes oscillating in opposite phases. Each box determines a twist moment for itself. This swirl moment can be compensated for by two counter-swirl masses. The plansifters run even more quietly.
  • the counter-rotating masses are preferably directly to the beln Kur ⁇ mounted as unbalanced masses, being so attached to the two cranks, that the resulting force by 180 ° 'is 15 ° +/- oppositely directed. It is possible to arrange at least part of the counter-swirl mass in the area of the plan sifter upper part and part in the area of the plan sifter lower part, and / or to design the cranks themselves so that they form part of the counter-swirl mass. The advantageous design thus enables the resonant circuits of the two sieve to control and change the boxes in such a way that the same resonant circuits can be achieved even with uneven product loads. This is done by changing the angle r_f by +/- 15 °.
  • the drive motor is arranged in the area of the top classifier part or the bottom part of the classifier and, viewed in plan, in the middle of the classifier.
  • each sieve box can be supported by cantilever elements. As explained above, this opens up completely new possibilities. Mills that are completely arranged on only one floor can thus be built in a simplified manner without additional expenditure for suspensions. In terms of sieving technology, however, it is an equivalent solution if each sieve box is suspended from free-swinging elements. In both cases, however, the cantilever elements should preferably be arranged in the area of the four outer ends for each sieve box, such that each sieve box represents an independent, operable vibration unit. This contributes to stable vibration behavior and simplifies assembly and any service work, since a part can stand on its own. In a further, very particularly advantageous embodiment, the cantilever elements are designed as rubber spring cross joints with restoring moment, which are mutually braced in the operating and idle states. The amount of tension is preferably approximately the center distance of the crankshaft journals.
  • FIG. 1 is a perspective view of a
  • FIG. 2 on an enlarged scale the vibrating drive of FIG. 1, FIGS. 3a to 3d four positions of the sieve boxes of an entire resonant circuit, FIGS. 4a to 4d a representation as in FIG. 3, but with additional unbalanced masses .
  • FIG. 5 shows the configuration of FIG. 1 with further details
  • a large-scale sifter 1 consists of a left sieve box 2 and a right sieve box 3. Each sieve box is supported on four cantilever elements 4 each.
  • the free vibrating elements 4 can be any known cardan - 1 0 -
  • the crank 10 has an upper bearing pin 11, which carries the transmission wheel 9 and is mounted in a bracket 12 of the sieve box 3.
  • a lower bearing pin 13 is mounted in a corresponding support 14 and is also connected to the screen box 3.
  • the crankshaft 15 also has an upper pivot bearing 18, which is firmly connected to the second screen box 2 via a support 19. Accordingly, a lower pivot bearing 20 is also fastened to the screen box 2 via a support 21.
  • FIGS. 3a to 3d show four positions of the crankshafts 15, each offset by 90 °, and the corresponding positions of the two sieve boxes 2 and 3.
  • the axis XX is - 1 1 -
  • F denotes the direction of the effective driving force in relation to the respective sieve box 2 or 3.
  • the pair of forces e.g. F «/ F, is
  • the counter-swirl mass 22 is connected to the crankshaft 15 offset by an upper support 23 and a lower support 24 at an angle of 90 ° +/- 15 ° to the brackets 16 and 17, respectively.
  • a rotatable fastening by means of the clamping device of the carrier 23, 24 to the crank pin 15 is expedient, since different angular positions with respect to the shaft axes can thus be set.
  • the counter-swirl mass 22 designed as a solid shaft can additionally have an upper counterweight 25 and a lower counterweight 26.
  • each sieve box 2 or 3 has four sieve compartments 30.
  • the door is removed from the sieve compartment 33 and twenty-five sieve frames 34 arranged one above the other can be seen.
  • the material to be screened is fed in via inlet 35, with one to four inlets and also not shown, several outlets being provided for each box.
  • the product guidance to individual or groups of sieve frames takes place via a channel system, not shown. Because of this situation, different product accumulations and thus imbalances for the swing structure arise in a large-scale sifter at different times.
  • each of the four cantilever elements consists of two rubber spring universal joints, an upper rubber spring universal joint 40, which is rigid upwards with one of the sieve boxes 2 and 2 respectively. 3 is connected, an intermediate support 42 and a lower rubber spring universal joint 41 which is fastened to the floor, the intermediate support 42 connecting the two rubber spring universal joints and making them a real cantilever element 4.
  • the rubber spring universal joints (40, 41) are designed in a manner known per se, such as from DE-OS 2 917 368 has been announced, which is referred to here with full content.
  • a great advantage of the freely vibrating plan sifter according to the invention is that after the drive motor has been switched on, it rotates calmly and stably on the resonant circuit diameter after only five seconds.
  • the drive motor With known cantilever constructions, for example, it takes around six to 10 minutes to achieve a stable concentricity on the oscillating circuit diameter.
  • plan sifter according to the invention also behaves favorably after the drive motor has been switched off, because this plan sifter stands still after 8 seconds.
  • the deviation from the resonant circuit increases by around 40% when swinging down to a standstill, whereas with conventional cantilever plan viewers the increase in the oscillation deflection can be around 2.5 times.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

Crible (1) à grande surface comportant deux caissons (2, 3) adjacents qui sont actionnés par des arbres (15) à manivelle de manière à effectuer des oscillations circulaires en opposition de phase. A cet effet, chaque caisson (2, 3) est suspendu ou suporté par des éléments oscillants (4, 5) et actionné par au moins deux manivelles (10). On obtient égalament une oscillation circulaire nette lorsque la charge de produit ne se trouve que d'un côté, en plaçant sur chaque manivelle (10) une masse d'équilibrage (22) et en disposant l'entraînement entre les deux caissons (2, 3) dans la région des deux côtés extrêmes.
PCT/CH1987/000030 1986-03-13 1987-03-10 Crible a grande surface comportant deux caissons de tamisage WO1987005542A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1038/86-0 1986-03-13
CH103886 1986-03-13

Publications (1)

Publication Number Publication Date
WO1987005542A1 true WO1987005542A1 (fr) 1987-09-24

Family

ID=4201004

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1987/000030 WO1987005542A1 (fr) 1986-03-13 1987-03-10 Crible a grande surface comportant deux caissons de tamisage

Country Status (2)

Country Link
EP (1) EP0258327A1 (fr)
WO (1) WO1987005542A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008089589A1 (fr) * 2007-01-22 2008-07-31 Bühler AG Tamis plan et entraînement pour tamis plan
EP2656927A1 (fr) * 2012-04-26 2013-10-30 Bühler AG Dispositif et procédé de fractionnement de produits en vrac
US20140299519A1 (en) * 2011-05-03 2014-10-09 Bühler AG Method and Device for Fractionating Bulk Material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR615720A (fr) * 1925-05-14 1927-01-14 Perfectionnement au mécanisme des plansichters
DE509867C (de) * 1930-10-16 Friedrich Ebeling Antriebsvorrichtung fuer Plansichter ohne Schwunggewichte
DE585554C (de) * 1933-10-05 Carl Becker Schwunggewichtsloser Plansichter
GB962350A (en) * 1961-09-18 1964-07-01 John Edward Baker Sifter drive
DE2917368A1 (de) * 1979-04-28 1980-10-30 Buehler Miag Gmbh Abstuetzung fuer maschinen mit schwingantrieb

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE509867C (de) * 1930-10-16 Friedrich Ebeling Antriebsvorrichtung fuer Plansichter ohne Schwunggewichte
DE585554C (de) * 1933-10-05 Carl Becker Schwunggewichtsloser Plansichter
FR615720A (fr) * 1925-05-14 1927-01-14 Perfectionnement au mécanisme des plansichters
GB962350A (en) * 1961-09-18 1964-07-01 John Edward Baker Sifter drive
DE2917368A1 (de) * 1979-04-28 1980-10-30 Buehler Miag Gmbh Abstuetzung fuer maschinen mit schwingantrieb

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008089589A1 (fr) * 2007-01-22 2008-07-31 Bühler AG Tamis plan et entraînement pour tamis plan
JP2010516440A (ja) * 2007-01-22 2010-05-20 ビューラー アクチェンゲゼルシャフト プランシフタおよびプランシフタのための駆動部
US8146749B2 (en) 2007-01-22 2012-04-03 Bühler AG Plan sifter and drive for a plan sifter
CN101616752B (zh) * 2007-01-22 2013-03-06 布勒股份公司 平筛及其驱动装置
KR101457721B1 (ko) * 2007-01-22 2014-11-03 뷔흘러 에이지 플랜 시프터 및 플랜 시프터용 구동장치
US20140299519A1 (en) * 2011-05-03 2014-10-09 Bühler AG Method and Device for Fractionating Bulk Material
US9108222B2 (en) * 2011-05-03 2015-08-18 Bühler AG Method and device for fractionating bulk material
EP2656927A1 (fr) * 2012-04-26 2013-10-30 Bühler AG Dispositif et procédé de fractionnement de produits en vrac

Also Published As

Publication number Publication date
EP0258327A1 (fr) 1988-03-09

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