EP0491331A2 - Dispositif d'entraînement pour tamis plan - Google Patents
Dispositif d'entraînement pour tamis plan Download PDFInfo
- Publication number
- EP0491331A2 EP0491331A2 EP19910121550 EP91121550A EP0491331A2 EP 0491331 A2 EP0491331 A2 EP 0491331A2 EP 19910121550 EP19910121550 EP 19910121550 EP 91121550 A EP91121550 A EP 91121550A EP 0491331 A2 EP0491331 A2 EP 0491331A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive shaft
- drive
- unbalanced mass
- drive device
- mass
- 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- Withdrawn
Links
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000000047 product Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 240000005979 Hordeum vulgare Species 0.000 description 1
- 235000007340 Hordeum vulgare Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000004890 malting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- 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
Definitions
- the present invention relates to a drive device for a plan sifter, with a vertically arranged drive shaft driven by a drive motor, connected to an unbalanced mass.
- Plansifters of the aforementioned type are screening machines which e.g. are used in milling plants to screen meal or meal products in order to e.g. to separate from intermediate products arising in the grinding process, to sort the product and to sort, classify and classify products such as semolina, rice, flour, malting barley or other granular or floury products.
- a total of four to eight stacks of sieve frames are inserted into the sieve housing, the end of the sieve housing is firmly connected to the drive housing in between via a connection carrier and the whole
- the plan sifter is elastically suspended from the ceiling rails by suspension rods, preferably glass fiber reinforced plastic rods.
- the product is fed through an inlet bench arranged on the top of the sieve housing through hoses, while the product discharge of the product, which is separated into several fractions of different grain sizes, takes place via associated outlet benches below the plan sifter, with the actual material feeding also being effected by hoses.
- An unbalance drive with a built-in, oscillating motor is used as the drive device of the plan sifter, which has a vertically arranged drive shaft with a flywheel or unbalanced mass fixedly arranged on it at a constant distance.
- the drive shaft is rotatably supported by bearings in the drive housing, which in turn is rigidly connected to the sieve housings containing the sieve stacks through the lateral connecting supports, on which the entire plan sifter is suspended by glass fiber-reinforced polyester rods combined into groups on both sides.
- the plan sifter goes through several drive phases until it reaches its steady operating state.
- the vibration system consisting of the unbalance drive and the sieve and drive housings moves almost synchronously.
- the direction of vibration of the exciter consisting of the drive shaft and the unbalance mass (unbalance drive) is in phase with the direction of vibration of the mass of the plan sifter.
- a corresponding phase shift occurs in a non-stationary area between the exciting and the excited mass.
- a range of critical speeds of the unbalance drive must be run through.
- the invention is therefore based on the object to provide a drive device of the type mentioned in such a way that it is dimensioned according to the drive power required in the stationary operating state and non-stationary starting and stopping processes can be shortened to a technologically required minimum duration.
- This object is achieved in that the unbalanced mass variable distance connected to the drive shaft and the distance of the unbalanced mass from the drive shaft is continuously variable depending on the speed of the drive shaft.
- the unbalanced mass forms an elongated cylinder body which is arranged parallel to the drive shaft and which is articulated by means of spaced joint bearings with associated couplings on spaced links which are firmly connected to the drive shaft.
- the particular advantage of the unbalance drive device according to the invention is that drive motors with a lower drive power can be used, since no power reserve which is coordinated with the start-up process of the plan sifter has to be taken into account when designing the drive device. As a result, both a lighter and less expensive drive arrangement is realized.
- FIG. 1 and 2 schematically explain a drive device of a plan sifter (screening machine), this drive device forming an unbalance drive of the plan sifter, which is constructed in a conventional manner and is not shown here.
- plansifters are operated in a hanging arrangement and consist of oppositely arranged sieve housings containing the sieves in a plurality of vertical sieve stacks, between which a drive housing containing the drive device is arranged and connected to form a structural unit.
- the drive device forms an unbalance drive with an oscillating drive motor in order to set the sieve housing and the sieves arranged in them into an oscillating movement via the drive housing, as is customary with such plan sifters and is therefore not shown here.
- a drive shaft 1 which is arranged vertically and is connected to a drive motor (not shown here), and an unbalanced mass 2 which is movably connected to the drive shaft 1 and which is movable in a variable distance.
- the drive shaft 1 is over a Upper and lower bearings 3 and 4 are mounted in the drive housing 5 of the plan sifter, which is only schematically indicated here, to which the screen housing, which is also not shown, is connected on both sides in a conventional manner.
- Fig. 1 shows the drive device in the idle state.
- the unbalanced mass 2 which forms an elongated cylinder body, the longitudinal axis of which is arranged parallel to the drive axis 1, is axially spaced apart with an upper spherical bearing 6 and a lower spherical bearing 7.
- Each of these spherical bearings 6, 7 is connected via a coupling 8, 9 by joints 10 and 11 to a link 12, 13 which extends rigidly radially from the drive shaft 1 and is rigidly connected to the latter.
- the unbalanced mass 2 is articulated and, with respect to the drive shaft 1, is mounted radially at a distance e0 of the drive shaft 1 in retirement and connected to it.
- Fig. 2 shows the drive device in the rotational state at operating speed, in which the plan sifter is in its stationary operation at nominal speed, the unbalanced mass 2 under the influence of the centrifugal force F a maximum distance e max from the drive shaft 1 and thus the greatest possible moment of inertia.
- the critical resonance speed range is reached.
- this critical speed range is already passed through before the unbalanced mass 2 is substantially deflected.
- the critical speed range is also run through without any problems at the end of the run.
- the unbalance mass 2 drops rapidly when the drive motor is switched off and the stored energy is already sufficiently reduced before the critical speed range is reached. This means that there are no major vibration amplitudes or dangerous resonance vibrations of the plan sifter even at the outlet.
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4040428 | 1990-12-18 | ||
| DE19904040428 DE4040428A1 (de) | 1990-12-18 | 1990-12-18 | Einrichtung zum antrieb eines plansichters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0491331A2 true EP0491331A2 (fr) | 1992-06-24 |
Family
ID=6420612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19910121550 Withdrawn EP0491331A2 (fr) | 1990-12-18 | 1991-12-16 | Dispositif d'entraînement pour tamis plan |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0491331A2 (fr) |
| DE (1) | DE4040428A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6260710B1 (en) | 1996-08-20 | 2001-07-17 | Buhler Ag | Flat sifter |
-
1990
- 1990-12-18 DE DE19904040428 patent/DE4040428A1/de not_active Withdrawn
-
1991
- 1991-12-16 EP EP19910121550 patent/EP0491331A2/fr not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6260710B1 (en) | 1996-08-20 | 2001-07-17 | Buhler Ag | Flat sifter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4040428A1 (de) | 1992-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT CH DE GB IT LI |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19920724 |
|
| R18W | Application withdrawn (corrected) |
Effective date: 19920724 |