EP1951432B1

EP1951432B1 - Arrangement for angular positioning of milling rolls

Info

Publication number: EP1951432B1
Application number: EP06844050.2A
Authority: EP
Inventors: Sedat Kunduraci
Original assignee: Yukselis Makina Sanayi Ve Ticaret AS
Current assignee: Yukselis Makina Sanayi Ve Ticaret AS
Priority date: 2005-09-16
Filing date: 2006-09-15
Publication date: 2020-04-08
Anticipated expiration: 2026-09-15
Also published as: EP1951432A1; PL1951432T3; WO2007055672A1

Description

FIELD OF THE ART

The Present invention relates to roller mill machines used in milling the grain.
The invention relates to use of the angled positioning arrangements on the bearing means for angular positioning of cylindrical ground milling rolls in roller mill machine used in milling mainly grains and similar products and accordingly bearing arrangements.
Initially the said angular positioning is made once and can be used in the same value constantly and it is also likely to change the angle depending on variable conditions.

BACKGROUND OF THE ART

The grains are milled between two rollers on which fluted, and are sorted in various sizes in sieving machines. The sorted goods are re-milled in other milling rolls having threads as per size of the grains.
In addition to the said fluted rolls there are rolls having ground surface performing crushing function. Crystal grained goods (semolina etc.) are crushed and fined with the rollers.
During crushing and fining operation there should an equal distance between rolls so as to allow flow of crushed goods. In case of failure of presence of equal distance between rolls and in case of existence of more distance in some parts, there will be leakage of non-ground, non-crushed goods from open spaces. Such case will lead to problems in flow of goods between milling and sieving components.
During operation on ground rollers decreasing diameter increase from caps of rolls towards medium occurs due to thermal expansion caused by bearing embodiment in bearing of roll caps. Such diameter increase causes concave conveying. (See Figure 5) During crushing, the caps of rollers apply pressure to each other and do not apply pressure on middle parts and thus leakage of non-crushed materials occur in the middle part. In order to eliminate this problem the rolls should be ground in conveyed manner in the predetermined sizes in advance before installation onto machine, which is suggested as a technical solution for goods leakage.
Milling with roll was developed during last quarter of the 18th century and has been used since the beginning of 19th century. The roll lengths of roller mill machines produced until 1970s was generally 60-70 cm. Concave convey amount occurring in short rolls is also little. Its negative impact on crushing is also little.
Due to no need for fine goods regarding flour quality in the past, development of different solution techniques has been prevented.
In new modern mills, said rolls are positioned on mounting block (11) providing collective removal of said rolls (1, 2) from said roller mill machine or installation to the machine. The lengths of these rolls can vary from 100, 125, 150 cm. Therefore, amount of concave convey, occurring in long rolls are too much and the rolls should be conveyed in a very accurate amount. (See Figure 1).
Nowadays improving flour quality requires finer milling of goods such as semolina etc. Therefore, it is highly essential that ground rolls are very accurately close to each other and produce goods in equal fine milling from all surfaces.
As conveyed ground benches are expensive and special benches, they are not found in every plant. Therefore, it is necessary to apply grinding operations with roll cylindrical grinding benches only in the locations where roll cylindrical grinding benches are available.
Applied stepped grinding method is the most used method to eliminate the impact of diameter increase in roll caps in roll grinding bench. (See Figure 2) When stepped grounded rolls are used, although partial smoothness is obtained as a result of expansion, goods leakage occurs in cap parts of the rolls.
In cylindrical grinding benches applications decreasing diameter increase in roll caps with conically grinding of cap parts of the roll are also commonly used. (See Figure 3).
During use of conveyed or cylindrical ground rolls various problems are encountered. The problems of failure to have exact contact at roll surfaces from time to time due to thermal differences likely to occur in bearing embodiment in rolls having determined convey amount are experienced. In this case the goods going through rolls are milled in different thicknesses along roll surface. In order to eliminate this problem, the roll should be dismantled from the machine and conveyed or conically ground in a determined amount.
It is understood that the grounding of the rolls by cylindrical ground machines used currently is very practical and important to eliminate the above-mentioned problems.
Angular positioning of the rolls is known from the prior art, however it is seen that these angular positioning processes can not be realized in a stabile manner because of the bearing arrangements have not appropriate technical structures.
In the prior art, DE 42 08 490 A1 states angular positioning of rolls. Moreover, in the document, bearing components that move the cylinders are mentioned. In DE 42 08 490 A1 , the two rolls are positioned together angularly by moving in opposite directions. However, for grinding processes, high pressure values are used between the rolls. Since, in DE 42 08 490 A1 , both rolls are moveable, high pressure values between the rolls can not be achieved. This affects product quality. In addition to that, because of movable bearing components, operational problems occur.
As an example to the prior art, a patent application with the publication number of EP0151997 A2 exists. The application mentions movement of bearing of at least one roll in vertical direction. For this purpose, driving components as preferably motor, spring or piston is used to move the bearing. In the invention, especially alternatives using eccentric part, there are three pieces (34, 25, 22) in connection with the driving component. On these pieces and moving bearing, there are three rotation axes. Since especially center with the number of "21" causes an extra movement after eccentric movement, supporting walls (75) are additionally employed to provide proper movement. These walls add values to the costs. In the current application, there are not any constructions such as intermediate piece as "22", axis as "21" and supports as "75" causing cost increase and making the operation harder. The driving components in the current application are created for different rolls than the ones of the prior art.
In another patent with the number of US5018960 , both bearings of both rolls are connected to bottom chassis by pins. Pins of one of the rolls are designed as eccentrically, and positioned in a manner just to provide adjustment of nip clearance between the rolls. However, in the current application, bearings of one of the rolls are in a single piece with mounting block. On the other hand, bearings of the second roll are connected to mounting block with eccentric component and adjustment arm thereof in a manner to make a roll have an angle compared to the other roll. The parallel placement is changed by moving an end of the roll to down and other and to up by eccentric component and components connected to that. As a result, angular adjustment is achieved. Again in the current application, the nip clearance between rolls is adjusted on top ends of the bearings. However, US5018960 has no mechanism to gather angular placement. Additionally, unlike the current application, in the US5018960 , the ends of the bearings are connected to the main chassis one by one, and do not allow rolls and eccentric components to be demounted from the machine body collectively.
In the recent past, gear drive was used for driving the rolls. In the gear drive application it is not possible to position the gears with an angle to each other. Moreover if the gears do not touch each other correctly, vibration, noise and knocking may occur. In order to prevent vibration, noise and knocking problem, more complicated gear systems need to be developed which is expensive and reducing the easiness of the application.
Today cylinders can be driven by specially developed strong belts. This case facilitates the cylinders run with angular from their center axis.

EXPLANATION OF THE INVENTION

Thanks to angular positioning embodiment being subject of this invention, the positioning of rolls, in exact contact with each other against diameter increase occurring after thermal expansion generated by bearing arrangements of two longitudinally cylindrical ground milling rolls, can be provided. In order to provide such embodiment milling rolls are positioned against each other in angle allowing full contact with each other along their surfaces. Thus, the machine operators will be enabled to use in the machine the rolls cylindrical ground in same amount longitudinally in simple grinding benches, which can be found everywhere.
The smooth ground rolls seen in Figure 4 expand from cap parts with the heat produced by bearing arrangements no. 10 and 13, and the rolls expanding from cap part gain the convex position shown in figure 5.
With the help of angular positioning embodiment being subject of this invention the parallel position of two rolls in terms of each other is disarranged and rolls can be adjusted in a manner providing full contact along roll surfaces (Figure 6). This contact can be monitored visually, with light control and also fine milling capability of machine can be monitored during operation and ideal angled positioning can be fixed.
Angular positioning embodiments should allow easy re-adjustment depending on decrease or increase in concave convey caused by thermal expansion differences in roll caps.
Arrangements having eccentric parts are used for bringing close and drawing away the rolls to each other in current systems. In the present invention, arrangement having eccentric part is used to move the rolls to be angular positioned against each other.
Angular adjustment can be automatically controlled by means of a control unit controlling angular adjustment of rolls through perception of parameters (heat, time) in order to determine the angle automatically.
There is a problem of leakage of non-crushed goods in cap parts of the rolls during the time period from initial operation until reaching operating temperature.
The present invention allows giving small angle to less heating rolls and wider angle to those heating more by help of automatically operating arrangement. The invention is also very important in terms of prevention of efficiency loss arising from on-off operations in the plants not in operation constantly (once or twice a day on shift).
In the cases where fluting of the roll (preferably fine flutes) to mill goods finely, angular position of rolls and elimination of convey has been a very effective method. Because, conveyed fluting technique is not known and being used.
Embodiment consists of mounting block and elevation part or slope sliding part or eccentric part placed on the mounting block, provide easy angular positioning of the rolls practically and in an easy manner in comparison with the current embodiments consist of many parts. Further that production costs and utilization costs have been reduced.
It is believed that the surprising effect has been provided by a solution such that using only a component (elevation part or slope sliding part or eccentric part) which integrally realizes angular positioning of the bearing(s) placed on the mounting block.

BRIEF DESCRIPTION OF FIGURES

Figure 1 . A two dimensional drawing indicating convey ground rolls in special grinding benches.
Figure 2 . A drawing indicating stepped ground cap rolls in cylindrical grinding benches.
Figure 3 . A drawing indicating the rolls whose caps are conically ground in cylindrical grinding benches.
Figure 4 . A drawing indicating cylindrical ground rolls longitudinally in cylindrical grinding benches.
Figure 5 . A drawing indicating concave convey of longitudinal cylindrical ground rolls as a result of thermal expansion.
Figure 6 . A perspective drawing indicating a sample angular positioning of concave convey roll (see figure 5). (Indicating the rolls positioned next to each other).
Figure 6a . A schematic drawing indicating central axial angles occurring when angle is provided by means of elevation of one of the rolls from single side.
Figure 6b . Schematic drawing indicating central axial angles when angle is provided by means of elevating or lowering of both rolls from both sides.
Figure 6c . A perspective drawing indicating a sample for angular positioning of concave convey roll (see figure 5). (Indicating the rolls positioned together)
Figure 7 . A drawing indicating the embodiment conducting angular positioning with slope sliding component before angular positioning, which is not the subject of the invention.
Figure 8 . Drawing indicating the embodiment conducting angular positioning with slope sliding component after angular positioning, which is not the subject of the invention.
Figure 9 . Drawing indicating performance of fixed adjustment with elevation part to perform angular positioning, which is not the subject of the invention.
Figure 10 . A drawing indicating complete angular positioning of milling package for angular positioning, which is not the subject of the invention.
Figure 11 . A drawing indicating the rolls before angular positioning by use of eccentric angular positioning arrangement
Figure 12 . A drawing indicating the rolls after angular positioning by use of eccentric angular positioning arrangement
Figure 13 . A drawing indicating the embodiment conducting automatic angular positioning depending on various parameters during operation as per varying parameters before angular positioning of rolls
Figure 14 . A drawing indicating the embodiment conducting automatic angular positioning depending on changes in parameters during operation as per varying parameters after angular positioning of rolls

REFERENCE NUMBERS

1	Roll	16	Moving component
2	Roll	17	Distance adjustment embodiment
3	Central axis	18	Tightening force
4	Central axis	19	Distance
5	Moving Bearing point	20	Elevation component
6	Moving bearing point	21	Eccentric angular positioning embodiment
7	Bearing point	22	Eccentric component
8	Bearing point	23	Eccentric adjustment arm
9	Inclined sliding component	24	Rotating center
10	Moving bearing	25	Rotating component
11	Installation block	26	Sensors
12	Center	27	Control unit
13	Bearing	28	Motor
14	Angular surface	α	Angle
15	Fixing components

The invention will be understood better when described with reference to the figures and reference numbers given above.

DETAILED DESCRIPTION OF THE INVENTION

The present invention solves the problems mentioned in the background of the art by means of changing the positions of the rollers (1,2) in terms of each other. For this purpose it is sufficient to give an angular position to one of the rollers (1, 2) in respect to the other roller. In such case an angle (α) is formed between the central axises (3, 4) of the roller. (see figure 6) The angle formation between the rollers can be made from one bearing point (5, 6, 7, 8) (see figure 6a) as well as mutually from both bearing points (7, 8). In this case, two angles (α) will be formed between central axises. (See figure 6b). The rollers can be positioned side by side in some cases and over each other in other cases in order to form the angle. The case where the angle (α) is formed by means of positioning them onto each other is depicted in figure 6c.
Two milling rolls (1, 2) can be used in roller mill machines and there are also machines having more than two rolls. In description of the invention only two rolls (1,2) have been depicted to give a sample.
It is possible to suggest several embodiments to realize the angular positioning. Figure 7 indicates the drawing showing the situation of the embodiment which is not the part of the invention conducting angular positioning with slope sliding component (9) before performance of angular positioning. The roll (2) has been mounted by means of a moving bearing (10) from moving bearing points (7,8) in a manner allowing moving around a central point (12) over mounting block (11). (See figure 7) The roll (1) is fixed onto mounting block (11) in a manner bearings (13) and slope sliding component (9) are in between from bearing points (5, 6).
The part of the mounting block (11) on the bearing (5, 6) level have an angular surface (14). Inclined part of inclined sliding component (9) is mounted onto angular surface of mounting block (11) in a sliding manner. By means of loosening of the fixing components on the mounting block and by using the moving component, inclined sliding part can be slid forward or backward. The bearing (13) and one end of roll (1) mounted to this bearing (13) moves up or down in a manner to disarrange the current parallel level with the other roll (2) (see figure 6a which depicts the case when one end of the roll (1) is elevated.) In same way the end of the roll (1) can also move downward or while one bearing point (5) is elevated, other bearing point (6) can be lowered. (See figure 6b) The position of the inclined sliding part (9) can be fixed at an appropriate level by means of fixing components (15). The engagement and disengagement distance of the rolls (1, 2) is adjusted by distance adjustment embodiment (17). Distance adjustment embodiment (17) are connected to moving bearing (10) and fixed bearing (13) and the rolls are engaged or disengaged by defeat of tightening force (18) positioned between them.
Figure 8 shows the position of rollers (1, 2) after performance of angular positioning. As it can be seen, central axises (3, 4) are not on the same alignment. A distance (19) has formed between them.
Positioning of rolls can also be realized by means of an elevation part (20) to be located under the fixed bearing (13) without use of an inclined sliding component (9). (See Figure 9)
Angular positioning of rolls to each other is provided by means of angular positioning of the mounting block (11) supporting the different angular positioning rolls (1, 2) (See figure 10). This can be realized by an inclined part that affecting both rolls at the same time. This part for the sample given in this example is the mounting block (11).
Another angular positioning has been depicted in figure 11 and figure 12. Figure 11 shows the eccentric angular positioning embodiment (21) before angular positioning of the rolls (1, 2). Figure 12 shows the eccentric angular positioning embodiment (21) after angular positioning of the rolls (1, 2).
Here, bearing (13) and mounting block (11) are in combined structure. The roll (2) is mounted in a manner allowing movement of moving bearing (10) moves on eccentric part (22). Eccentric adjustment arm (23) rotates eccentric part (22) around moving center (24) on the mounting block (11). Upon movement of eccentric part (22) moving bearing (10) connected to eccentric part (22) and one end of the roll (2) connected to the bearing (10) moves up and down in a manner causing loss of parallel position with other roll (1). Rotating component (25) provides up and down position of eccentric adjustment arm (23) and is fixed in the position deemed appropriate. Distance adjustment embodiment (17) adjusts engagement and disengagement distance of both rolls (1, 2) to each other. This embodiment can be realized in several ways.
Figure 12 shows the moving roller (2) positioned upward in respect to eccentric part (22). Eccentric part (22) is placed to position the rolls angularly; this part is not used for engaging and disengaging the rolls to each other. There are other arrangements on cylinder packages for engaging and disengaging the rolls to each other.
Angular positioning can be made at one end of the rolls (1, 2) as well as both ends thereof. Equal angles (α) will be formed as a result of moving central axis (3, 4) of the rolls (1, 2) at both ends of the roll in different directions. (See Figure 6b) Even in very specific cases it is also possible to apply it from all bearing points (5, 6, 7, 8) of both rolls (1,2).
The charts indicating quantities or distances can be used on angular embodiments by means of performing statistics and calculations in a manner guiding the angular positioning.
The heat generated by bearing embodiments (10, 13) may not be in the same amount all the times. Therefore, expansion (diameter increase) in ends of the roll (1, 2) is not always the same. Accordingly, the amount of convex to be caused by ends of rolls expanding in different amounts on the roll (1, 2) will be different. In such cases the position of the rolls (1, 2) to each other can vary depending on changing parameters.
The heat in the bearings (10, 13) is measured with sensors (26) located on bearing points (5, 6, 7, 8). The motor (28) is driven by a control unit (27) pursuant to such values. The eccentric adjustment arm position can be adjusted from control unit to where it is wished at which temperature.
The rolls (1, 2) can also be automatically positioned and operated at various angles to each other according to time or a similar value without relying on the heat values on bearing points (5, 6, 7, 8).
The embodiments such as automatic angular positioning etc. can be adapted to inclined sliding part (9) application (Figures 7-8) and application of elevation part (20) to mounting block (11) (Figure 10).
The invention also allows application of different angle (α) to rollers (1, 2) pursuant to changing parameters (time, heat etc.).
Since angular positioning of the end of the roller will create a situation indicated in figure 6a, one end of the rollers (1, 2) will disengage from the other end. Therefore, it is needed to re-adjust the distances of rolls (1, 2) to each other.
Since simultaneous moving both ends of one of the both rollers (1, 2) in different directions in a way deforming the parallel position thereof will provide angular positioning of the rollers (1, 2) from the center, the situation indicated in figure 6b will occur. Accordingly, may not required to re-adjust the rollers (1,2) in respect to each other during convey elimination operation.
The protection scope of present invention has been specified in the claims section and cannot be limited to the representative applications given in above. It is obvious that a skilled person in the art can realize the invention suggested here under by use of similar embodiments or apply this embodiment to other similar purposed fields used in the art. Therefore, it is clear that such embodiments will be deprived of any invention.

Claims

Roller mill machines comprising at least two rolls (1, 2) supported by means of bearing components (10, 13) and used for grinding grains, positioned such that an angle (α) can be formed between the central axes (3, 4) of said rolls (1, 2), and comprising at least two rolls (1, 2) arranged so as to provide adjustment of said angles (α), a distance adjustment embodiment (17) which adjusts engagements and disengagement distance of both rolls (1,2) to each other; an installation block (11) integrated with said bearing (13), an eccentric component (22) moved around the rotating center (24) found on said installation block (11) characterised in that said eccentric component (22) is moved by means of an eccentric adjustment arm (23), and allowing formation of the angle (α) between the axes (3, 4) by raising at least one end of said bearing (10) of said supported roll (2), a rotating component (25) allowing posititioning of said eccentric adjustment arm (23) up and down.