EP3575001A1 - Roller packages for milling devices, milling devices and method - Google Patents

Abstract

Disclosed are roller packs (10) for grinding devices (70), comprising a first roller (11) which is held by at least one first bearing body (13) and a second roller (12) which is held by at least one second bearing body (14) becomes. In a first aspect it is provided that the first bearing body (13) and the second bearing body (14) are prestressed against each other and have stop bodies (17, 19) with stop surfaces (18, 20), the contact of which contacts the rollers (11, 12 ) counteracts. The rotational position of the first stop body (17) determines the minimum width of the grinding gap. Also disclosed are grinding devices (70), methods for operating a roller package (10) and methods for determining the radial force acting between the rollers (11, 12) of a roller package (10).

Description

The present invention is concerned with roll packages for grinding devices, with grinding devices and with methods for determining the radial force acting between the rolls of a roll stack.

For a variety of industrial applications, various types of grinding devices are used, with which particulate ground material is ground. These include, for example, miller roll chairs, malt shot mills, feed mills and coffee grinders. Such grinding devices contain one or more roller packages, each with at least two rollers. The rollers can be held by a respective bearing body. Between the rollers, a grinding gap is formed, which is adjustable in many roll packages, for example by the bearing bodies are adjustable relative to each other.

The known roll packages are constructed essentially according to the same principle: By a mechanical, pneumatic or electromechanical drive the width of the grinding gap is reduced by moving the movably mounted roller to an operating gap, d. H. "indented". The operating gap can then be further adjusted during operation, for example manually or by motor.

In the documents DE 595 934 and DE 597 775 discloses means for controlling the contact pressure of grinding rolls. These devices include adjustable suspensions that allow for the deflection of the grinding rollers during the passage of hard foreign bodies.

Roller packages have a certain rigidity, which can be characterized by the dependence of the radial force acting between the rollers and the width of the grinding gap. This rigidity is composed of the stiffnesses of the rolls, the rolling bearings and the remaining components of the roll package. In the engaged state, the positions of the rollers are thus dependent on the forces prevailing in the grinding gap. Mainly the radial forces lead to a broadening of the grinding gap. As long as the forces are constant, this can be corrected during operation and has no negative influence.

For regrind, which is difficult to move between the rolls, the forces in the grinding gap are very variable. If the material passes through the grinding gap, the rollers are forced apart. If no regrind is drawn in for a short time, the rollers touch each other. In such a situation, the gap stiffness has a great influence on the behavior and properties of the ground material.

It is a first object of the invention to overcome the disadvantages of the known roll packages. In particular, roll packages are to be provided, in which the width of the grinding gap remains as constant as possible in order to be able to produce regrind with as homogeneous a properties as possible.

These and other objects are achieved in a first aspect of the invention by a roller package for a grinding apparatus, which comprises a first roller, which is held by at least one first bearing body, and a second roller, which is held by at least one second bearing body. The first bearing body and the second bearing body are adjustable relative to each other such that a grinding gap formed between the first roller and the second roller is adjustable. For example, the second bearing body may be pivotally supported on the first bearing body. The first bearing body and the second bearing body are biased by means of a clamping device against each other such that the first roller and the second roller are pressed towards each other.

According to the invention, it is provided that the first bearing body has at least one first stop body with a first stop face and the second bearing body has at least one second stop body with a second stop face, wherein the stop faces are designed and arranged or can be arranged on the bearing bodies such that a contact of the stop faces counteracts a contact of the rollers. Counteracting means here and below not necessarily that contact of the rollers is completely prevented; such contact is also allowed in the context of the present invention for very small predetermined grinding gap widths.

Furthermore, the first stop body is rotatable about a first axis of rotation. The first abutment surface is formed by an eccentric circumferential surface of the first abutment body with respect to the first axis of rotation, in such a way that the rotational position of the first abutment body determines the minimum width of the refining gap. The circumferential surface of the first stop body is here and hereinafter referred to as eccentric, if it is not rotationally symmetrical with respect to the first axis of rotation, that is, by rotation of the first stop body about the first axis of rotation by at least an angle greater than 0 ° and smaller than 360 ° is not translated into itself.

Varies in a roll package according to the invention, the force prevailing in the grinding gap, so only the biasing force between the bearing bodies, but not their relative position changes. The only flexibility with regard to the grinding gap thus results from the rolls and bearings. By turning the first stopper body, the properties of the ground grind can be precisely adjusted, such as the starch damage, the water absorption and especially the particle size distribution of flour (especially when due to a fluctuation of the grinding device supplied mass flow, the gap occupancy and thus the splitting force varies).

In order to prevent the stopper body from coming out of contact and thus the width of the grinding gap is too large, the biasing force prevailing from the tensioning device between the stop bodies should be greater than the maximum expected force between the stop bodies, which results from the forces prevailing in the grinding gap.

The tensioning device can be part of the roll package. However, it is preferred if the clamping device is part of a machine stand of the grinding device and the roller package has a coupling device for releasable coupling with the clamping device. This facilitates the assembly and disassembly of the roll package. By this coupling, the clamping device of the machine stand can cause the bias of the bearing body of the roll stack. The coupling device can be arranged on one of the bearing bodies.

The circumferential surface of the first stop body may be cylindrical with respect to the first axis of rotation. In the circumferential direction with respect to the first axis of rotation, the peripheral surface may, for example, at least in sections, have the shape of a spiral. A spiral is understood to mean that the distance of the peripheral surface from the first axis of rotation becomes larger or smaller as a function of the angle. The spiral is preferably an Archimedean spiral in which the distance depends linearly on the angle.

It is advantageous if the second stop body is rotatable about a second axis of rotation parallel to the first axis of rotation and the second stop surface is rotatable by one with respect to the second Rotary axis rotationally symmetrical peripheral surface of the second stop body is formed. For when the first stop body is rotated to adjust the width of the grinding gap, the peripheral surfaces of the two stopper body can roll against each other, whereby a significantly lower friction is produced and consequently the adjustment is facilitated. This is in the context of the present invention is important because the stopper body are preferably pressed against each other with a high bias voltage.

Further, it is expedient if the first axis of rotation of the first stop body and / or the second axis of rotation of the second stop body is slidably disposed, in particular in a direction perpendicular to the first axis of rotation. While a rotation of the first stop body causes a fine adjustment of the grinding gap, a coarse adjustment of the grinding gap can be achieved by moving at least one of the stopper body.

The fine adjustment is further facilitated if the roll package has a rotatable about a handwheel axis handwheel, which is coupled via a handwheel gear in such a way with the first stop body that rotation of the handwheel causes rotation of the first stop body. In known manner, a transmission can be selected such that a comparatively small torque is translated to the handwheel to a large torque on the first stop body. Preferably, the handwheel gear should have the highest possible efficiency. Another advantage is a small gear game to allow the most accurate position indicator on the handwheel and the most accurate position of the first stopper body. All this is in the context of the present invention is important because the stopper body are preferably pressed against each other with a high bias voltage. Moreover, it is preferred if the handwheel transmission has a plurality of transmission inputs, in particular a first transmission input for the Handwheel and a second transmission input for a motorized adjustment.

The invention also includes a method of operating a roll stack as described above. The method includes a step in which the first bearing body and the second bearing body are biased against each other by means of the tensioning device such that the first roller and the second roller are pressed towards each other.

In order to set the minimum width of the refining gap, the method may include a further step of rotating the first abutment body about a first axis of rotation to adjust the minimum width of the refining gap.

Furthermore, it makes sense if the roller assembly has a force measuring device which includes a first sensor for determining a first force, with which the first bearing body and the second bearing body are biased against each other, and a second sensor for determining a second force which between the first stopper body and the second stopper body acts. One or both sensors may be force sensors for directly determining the forces. Alternatively, however, at least one of the two sensors can also be designed for the indirect determination of the forces, for example as a pressure sensor, with which a pressure prevailing in a cylinder (in particular in a bellows cylinder explained below) can be determined, from which the associated force can then be determined can. From the two forces directly or indirectly determined by the sensors, the force acting between the rollers can be calculated.

The first sensor can be integrated, for example, in the clamping device. The second sensor may be arranged, for example, on the second stop body.

The invention also includes a method for determining the radial force acting between the rolls of such a roll stack. The method includes a step in which the force acting between the rollers is calculated from the forces determined by the sensors.

In order to display in the simplest possible way (without electronic elements such as gap sensors or encoders) the position of a handwheel as already mentioned above, position indicators are used in the prior art. If the operating gap is set as desired, the position of the handwheel is referenced by turning the position indicator. Thus, when the adjustment of the grinding gap required, the ground state can be found easily. The position indicator is received in the handwheel and clamped in the prior art by a radial screw and secured against twisting or slipping out. Another variant is the axial tensioning to the rear. However, the vibrations generated during the grinding operation can considerably impair the position display.

Oil-filled position indicators are indeed more robust in this respect; However, the clamping of the position indicator is even more critical: too weak braced dissolves the position display, too strong, it can break. It has already been tried to solve this problem with special screws. However, such a special screw can be lost. If it is replaced by an ordinary screw, leaks can occur. Another disadvantage is that a tool is required for the referencing and that the screws are small and often difficult to access.

Another object of the present invention is to overcome these disadvantages and, more particularly, to provide a roll package having a position indicator which is suitable for grinding can withstand occurring vibrations and can be easily adjusted.

To solve this problem, in the second aspect of the invention, a roll package for a grinding apparatus is proposed, which comprises a first roller and a second roller and a rotatable about a handwheel axis handwheel, by means of which a grinding gap formed between the first roller and the second roller is adjustable. For example, it may be a roll package as described above. According to the invention, the roller package has a position indicator for indicating a position of the handwheel, and the position indicator includes a position indicator housing and a display element movable along the handwheel axis of rotation relative to the position indicator housing, which is biased or prestressed in the direction of the handwheel axis against the position indicator housing by means of a position indicator spring. that it is secured in a holding position by contact with the position indicator housing against rotation about the handwheel axis of rotation and is rotatable only upon overcoming the bias caused by the position indicator spring bias about the handwheel axis of rotation.

In order to rotate the display element during referencing, it only has to be pressed by hand against the bias and can then be rotated. This eliminates the above-mentioned screws and tools. In addition, the disturbing effects of vibrations during the grinding operation can be effectively prevented.

In one possible embodiment, the display element and the position indicator housing contact surfaces, which allow a positive connection in the holding position. As a result, the disturbing influences of vibrations during the grinding operation can be suppressed particularly effectively. alternative or in addition to the form-fitting can also be present in the holding position a positive connection.

For example, for revision purposes, it is occasionally necessary to exchange one or more rolls of a grinder. For this purpose, the roller package may have an integrated roller device with at least one roller, which is arranged or can be arranged on the roller packet such that the roller packet can be placed with the at least one roller on a horizontal base and moved thereon.

The bearings of the rollers in roller bearings of the bearing body requires the use of lubricants whose uncontrolled escape from the bearings should be prevented. There are sealing systems that are robust against over-lubrication or rough mounting conditions, but which can not completely prevent leakage of the lubricants.

In order to allow a controlled discharge of the lubricants, a bearing cap of the roll stub bearing rolling bearing on its inside a rolling stub roll circumferential guide groove for lubricant, which is connected to an outlet port through which lubricant can escape from the guide groove. Below the outlet opening may be arranged a collecting device for collecting the lubricant, for example a collecting container. The targeted capture of the leaked lubricant allows a robust seal construction, which is inexpensive and easy to install, no danger of over-lubrication and at the same time allows a hygienic operation of the grinding device.

To achieve a homogeneous grinding over the entire length of the rolls, the rolls are often cambered. If, however, no uniform grinding work can be achieved over the entire length of the roll, the crowning can be adjusted. By cupping the rollers, so tilting the roller axes, In addition to the gap adjustment results in a manipulated variable to influence the grinding over the roll length and to achieve a more uniform grinding. For this purpose, it may be provided that the first roller is held by two first bearing bodies, the second roller is held by two second bearing bodies and the first bearing bodies are independently adjustable and / or the second bearing bodies are independently adjustable.

In one possible embodiment, this can be achieved in that the second bearing body is pivotally supported by a pivot pin on the first bearing body and the pivot pin is adjustable relative to the first bearing body, for example in the vertical direction. This can be accomplished, for example, by the first bearing body having a wedge configured and arranged such that displacement of the wedge in a first direction relative to the first bearing body displaces the pivot pin in a second direction different from the first direction relative to first bearing body causes. Alternatively, the second bearing body but also be adjustable by means of an eccentric relative to the first bearing body.

The roll packages according to the invention are particularly advantageous in connection with one as in the international patent application PCT / EP2018 / 061793 disclosed gear, the disclosure of which with respect to this transmission is incorporated by reference in the present application. Specifically, therefore, the present invention includes that the roll pack further includes a gear including a bearing housing in which an input shaft, a first output shaft, and a second output shaft are accommodated, the input shaft and the first output shaft perpendicular to each other, and the first output shaft and the output shaft second output shaft are arranged parallel to each other, the input shaft and the first output shaft via a bevel gear pair are in operative connection, the first output shaft and the second output shaft are operatively connected to each other via a torque transmitting arrangement, the first output shaft is coupled to the first roller, and the second output shaft is coupled to the second roller.

A further aspect of the invention is a grinding device, for example a miller roll mill, a malt grist mill, a feed mill or a coffee grinder. The grinding device includes a machine stand and at least one roller package as described above, which is designed according to one of the preceding claims and can be used or inserted in the machine stand. This results for the grinding device already explained above for the roll package advantages.

As has already been explained above, it is expedient if the machine stand has a clamping device and the roller package has a coupling device for releasable coupling with the clamping device. This facilitates the assembly and disassembly of the roll package.

To generate the bias, the clamping device may comprise a cylinder, which is preferably designed as a bellows cylinder. It is particularly preferred if the bellows cylinder is coupled to a vent valve. In this way, relief can be achieved in the event of overload (for example, when a foreign body enters the grinding gap) by reducing the pressure prevailing in the bellows cylinder by opening the venting valve. For quick relief, the bleed valve should be dimensioned accordingly.

To increase the Mahlspalterweiterung in case of overload, the clamping device may further comprise at least one prestressed and in particular connected in series with the cylinder spring. The preloaded spring may be about a known disc spring package.

The tensioning device may include a tie rod, a pull bush pivotally mounted at a first end of the tie rod, a pull rod partially received in the pull bush and biased by a spring, and the cylinder coupled to a second end of the tie rod. The pull rod can be coupled to a arranged on the second bearing body coupling device of the roll stack. The tie rod can be supported in the mounted state of the roll package in a support point located between its ends on the bearing body. By activating the cylinder, the second end of the tie rod can be pressed against and supported against the first bearing body, whereby the total torque acting on the roll pack can be reduced. The tie rod can be pivoted about the support point and thus pull on the draw bush and on the drawbar. In this way, the first bearing body and the second bearing body can be biased against each other in such a way that the first roller and the second roller are pressed toward each other.

It has already been mentioned that, for example, one or more rollers of a grinding device have to be exchanged for inspection purposes. The rollers can be removed one after the other, or the entire package can be removed. The rollers can be picked up on the grinding surfaces, on the bearing bodies or on the roller stubs. In the first variant, lifting takes place by means of hydraulic lifting tables and then rolling out. When receiving on the bearing bodies rollers are first mounted, and then the roll package is lifted by lowering the rollers and then rolled out on the rollers. For hanging on the roll stubs these can be lifted with chain hoists and the chain hoists can then be moved in rails. Also, a horizontal receptacle on the roll stubs is possible by rollers are attached thereto and moved in rails. The document EP 1 201 308 A1 disclosed Furthermore, a roller package with integrated rollers, which can be placed by means of an eccentric to the bottom, so as to be able to lift the roll package.

All of these methods, however, have disadvantages. For example, for rolling out in a preparatory step, the rollers must first be mounted or at least adjusted. In addition, the lifting of the roll packet is according to EP 1 201 308 A1 quite laborious.

In a further aspect of the invention, these disadvantages are eliminated by a grinding device, in particular a miller roll mill, which contains a machine stand and at least one roll pack with a first roll and a second roll, which is used or can be used in the machine stand. In particular, the roll package may be as described above. The roll pack has an integrated rolling device with at least one roll, which is arranged or can be arranged on the roll pack in such a way that the roll pack with the at least one roll can be placed on a horizontal support and moved thereon. Furthermore, the machine stand has at least one rail on which the at least one roll of the roll stack can be moved during assembly and / or disassembly of the roll stack. Furthermore, the roll pack has at least one contact surface, and the machine stand has at least one mating contact surface. The contact surface and the mating contact surface are matched to one another and to the at least one rail such that the at least one roller of the roller assembly does not rest on the rail in a mounting position of the roller assembly due to a form fit between the contact surface and the mating contact surface.

By this inventive embodiment, the package is not raised during disassembly, but lowered onto the rollers. In addition, the rollers of the roller package are not in the mounting position on the rail, which protects the rollers.

Figur 1:

ein erfindungsgemässes Walzenpaket in einer ausgerückten Stellung mit einem Teil einer Spanneinrichtung;

Figur 2:

das erfindungsgemässe Walzenpaket in einer eingerückten Stellung mit dem Teil der Spanneinrichtung;

Figur 3a:

einen erfindungsgemässen Müllereiwalzenstuhl mit zwei erfindungsgemässen Walzenpaketen in einer perspektivischen Ansicht;

Figur 3b:

den erfindungsgemässen Müllereiwalzenstuhl in einer Seitenansicht;

Figur 3c:

den erfindungsgemässen Müllereiwalzenstuhl in einer Draufsicht;

Figur 4:

einen erfindungsgemässen Müllereiwalzenstuhl mit einem erfindungsgemässen Walzenpaket in einer Seitenansicht;

Figur 5:

eine Detailansicht eines Handrads und eines Handradgetriebes zur Feineinstellung der Spaltbreite;

Figur 6:

eine Detailansicht einer Positionsanzeige zum Anzeigen einer Position des Handrads;

Figur 7:

eine Detailansicht zweier Kraftsensoren zur Bestimmung der zwischen den Walzen wirkenden Kraft;

Figur 8:

eine Detailansicht des Walzenpakets zur Verstellung der Lagerkörper;

Figur 9:

eine Schnittansicht durch ein Wälzlager des Walzenpakets;

Figur 10:

eine perspektivische Ansicht des Walzenpakets mit einer Auffangwanne für Schmiermittel;

Figur 11:

eine Detailansicht einer Rolleinrichtung des Walzenpakets mit Rollen und Kontaktflächen;

Figur 12:

eine Detailansicht des Maschinenständers mit Schienen und Gegenkontaktflächen.

The invention will be explained with reference to an embodiment and several drawings. Show

FIG. 1:

an inventive roller package in a disengaged position with a part of a clamping device;

FIG. 2:

the inventive roller package in an engaged position with the part of the clamping device;

FIG. 3a:

a miller roller mill according to the invention with two roller packages according to the invention in a perspective view;

FIG. 3b:

the Müllereiwalzenstuhl invention in a side view;

FIG. 3c:

the Müllereiwalzenstuhl invention in a plan view;

FIG. 4:

a Müllereiwalzenstuhl invention with a roll package according to the invention in a side view;

FIG. 5:

a detailed view of a handwheel and a handwheel gear for fine adjustment of the gap width;

FIG. 6:

a detailed view of a position indicator for indicating a position of the handwheel;

FIG. 7:

a detailed view of two force sensors for determining the force acting between the rollers;

FIG. 8:

a detailed view of the roll package for adjusting the bearing body;

FIG. 9:

a sectional view through a roller bearing of the roll stack;

FIG. 10:

a perspective view of the roll package with a collection tray for lubricant;

FIG. 11:

a detailed view of a rolling device of the roll package with rollers and contact surfaces;

FIG. 12:

a detailed view of the machine stand with rails and mating contact surfaces.

The FIGS. 1 and 2 show a roll package 10 for a Müllereiwalzenstuhl in a side view. The roller package 10 includes a first roller 11, which is held by two first bearing bodies 13, and a second roller 12, which is held by two second bearing bodies 14. The second bearing body 14 are pivotally supported by pivot pins 57 on the first bearing bodies 13.

The in the FIGS. 3a to 3c Each mill stack 10 is drivable by means of a gear 43, which comprises a bearing housing 44, in which a not visible here input shaft, a first output shaft 46 and a second Output shaft 47 are added. The input shaft and the first output shaft 46 are perpendicular to each other and the first output shaft 46 and the second output shaft 47 are arranged parallel to each other. The input shaft and the first output shaft 46 are operatively connected to each other via a bevel gear pair which can not be seen here, and the first output shaft 46 and the second output shaft 47 are connected via a torque transmission arrangement, likewise not shown in operative connection with each other. The first output shaft is coupled to the first roller 11, and the second output shaft 47 is coupled to the second roller 12. For a detailed description of the transmission 43, reference is made to the already mentioned international patent application PCT / EP2018 / 061793 directed. The gear 43 allows the movable mounting of the second roller 12th

The first bearing body 13 further has a first, rotatable about a first axis of rotation A1 stop body 17 with a first stop surface 18. This is formed by a respect to the first axis of rotation A1 eccentric peripheral surface 18 of the first stop body 17. The second bearing body 14 has a second abutment body 19 rotatable about a second rotational axis A2 parallel to the first rotational axis A1 with a second abutment surface 20. This is formed by a peripheral surface 20 of the second abutment body 19 rotationally symmetrical with respect to the second rotational axis A2. The two abutment surfaces 18, 20 are designed and arranged on the bearing bodies 13, 14 such that a contact of the abutment surfaces 18, 20 counteracts a contact of the rollers 11, 12, as will be explained below.

In FIG. 1 a disengaged position of the roller package 10 is shown, in which the stop surfaces 18, 20 are not in contact with each other. By means of a clamping device 16, which is part of the machine stand 71 and is only partially shown here, the first bearing body 13 and the second bearing body 14 are so relative to each other adjustable that a formed between the first roller 11 and the second roller 12 grinding gap is adjustable. The tensioning device 16 includes a tie rod 51, a pull bushing 55 mounted pivotably at an upper end 67 of the tie rod 51 via a hinge 54, a pull rod 52 partially received in the pull bush 55 and prestressed by means of a disk spring package 41, and a bellows cylinder 40 connected to a lower one The end of the 68th Tie rod 51 is coupled and only in FIG. 4 is shown. The pull rod 52 is coupled to the second bearing body 14 by means of a coupling direction 66 arranged on the second bearing body 14. The tie rod 51 is supported in a support point 75 on the first bearing body 13, as long as the roll pack 10 is installed.

FIG. 4 By activating the bellows cylinder 40, the lower end 68 of the tie rod 51 is pressed against and supported against the first bearing body 13, thereby reducing the total torque applied to the roller package 10. The tie rod 51 is thereby pivoted about the support point 75 and thus pulls on the pull bushing 55 and on the pull rod 52 and thus on the coupling device 66 on the second bearing body 14. In this way, the first bearing body 13 and the second bearing body 14 are biased against each other, that the first roller 11 and the second roller 12 are pressed towards each other.

The storage on the bellows cylinder 40 causes an overload protection. In order to allow immediate relief in case of overload (for example, when a foreign body enters the grinding gap), the bellows cylinder is coupled with a sufficiently large vent valve in order to quickly reduce the pressure prevailing in the bellows cylinder by opening the vent valve. Without opening the vent valve would also increase the force, but would be much smaller than if only one spring pack was available.

In the FIG. 2 illustrated indented position of the roll package 10 is achieved when the stop surfaces 18, 20 come into contact with each other. If the force prevailing in the grinding gap varies, then only the pretensioning force between the bearing bodies 13, 14 changes, but not their relative position. The rotational position of the first stop body 17 determines the minimum width of the grinding gap.

In order to be able to roughly set the width of the grinding gap, the first axis of rotation A1 of the first stop body 17 and the second axis of rotation A2 of the second stop body 19 are displaceably arranged, in a direction perpendicular to the axes of rotation A1, A2.

The roll package 10 further comprises a fine adjustment of the width of the grinding gap on a hand wheel axis H rotatable hand wheel 21. The handwheel 21 is about a in FIG. 5 illustrated handwheel 22 coupled to the first stop body 17. It is such that turning the handwheel 21 causes the first stopper body 17 to rotate. As a result, a comparatively small torque on the hand wheel 21 can be translated to a high torque on the first stop body 17. The handwheel 22 has for the above purposes, a high efficiency and a small gear play.

The roller package 10 further has a detail in FIG. 6 The position indicator 26 includes a position indicator housing 27 and a display element 28 movable along the handwheel axis of rotation H relative to the position indicator housing 27. The indicator 28 is so against the position indicator housing in the direction of the handwheel axis H by means of at least one position indicator spring 29 27 is biased or prestressed that it is rotatable about the handwheel rotation axis H only when overcoming the bias caused by the position indicating spring 29. This is done by positive locking elements 53 on the display element 28 and the position indicator housing 27th

For determining the radial forces prevailing between the rollers 11, 12, the roller package 10 comprises a force measuring device, which includes a first force sensor 24 and a second force sensor 25. The first force sensor 24 is integrated in the clamping device 16, namely in the region of the joint 54 formed between the tie rod 51 and the tie rod 52; the second force sensor 25 is located on the second stop body 19 (see FIG. 7 ). As a result, a first force can be determined with the first sensor 24, with which the first bearing body 13 and the second bearing body 14 are biased against each other, and with the second sensor 25, a second force can be determined between the first stop body 17 and the second Stop body 19 acts. From these forces, the force acting between the rollers 11, 12 can be determined by calculation.

In FIG. 8 is shown in detail how the second bearing body 14 are pivotally supported by pivot pins 57 on the first bearing bodies 13. The first bearing body 13 each contain a wedge 39 through which a screw 56 is guided. A rotation of the adjusting screw 56 causes a displacement of the wedge 39 in a horizontal first direction R1 and thus a displacement of the pivot pin 57 and the second bearing body 14 in a vertical direction to the first direction R1 second direction R2. In this way, the second bearing body 14 are individually adjustable relative to the first bearing bodies 13, which allows tilting of the roll axes.

The Figures 9 and 10 show in detail a roller bearing 58 and its seal. A roller stub 33 of the second roller 12 is supported by an inner ring 59, a plurality of rolling elements 60 and an outer ring 61. In the axial direction thereof there are an inner bearing cap 62 and an outer bearing cap 63 which have on their inner sides 34 the roller stub 33 circumferential grooves 64 for seals and guide grooves 35 for lubricants, not shown here. Furthermore, there are paragraphs 65, the ejection of the lubricant support. The guide groove 35 of the outer bearing cap 63 is connected to an outlet opening 36, through which lubricant can escape from the guide groove 35 of the outer bearing cap 63. Below the outlet opening 36 is a collecting device 37 for collecting the lubricant, which is in the form of a trough 37. There is an unillustrated connection bore between the interior and the guide groove 35 to prevent over-greasing and allow excess grease to escape through this connection bore. This allows the miller roll chair 70 to be operated hygienically.

How FIG. 11 shows, the roll pack 10 has an integrated rolling device 30 with rollers 31. The rollers 31 are arranged on the roller package 10 such that the roller package 10 can be placed with the rollers 31 on a horizontal support not shown here and moved thereon. The machine stand 71 of the milling mill chair 70 has according to FIG. 12 Rails 72 on which the rollers 31 of the roll package 10 during assembly and / or disassembly of the roll package 10 are movable. The roll package 10 also has front contact surfaces 76 (see FIG. 8 The contact surfaces 42, 76 and the mating contact surface 73 are matched to each other and on the rails 72 that the rollers 31 in a mounting position of the roll stack 10 due to a positive connection between the contact surface 42, 76 and the mating contact surface 73 do not rest on the rail 72.

Claims (17)

A roll package (10) for a grinding apparatus (70) comprising a first roll (11) supported by at least one first bearing body (13) and a second roll (12) held by at least one second bearing body (14) .
wherein the first bearing body (13) and the second bearing body (14) are adjustable relative to each other such that a grinding gap formed between the first roller (11) and the second roller (12) is adjustable,
wherein the first bearing body (13) and the second bearing body (14) by means of a clamping device (16) are biased against each other such that the first roller (11) and the second roller (12) are pressed towards each other, characterized in that the first bearing body (13) has at least one first stop body (17) with a first stop surface (18) and the second bearing body (14) has at least one second stop body (19) with a second stop surface (20), - The stop surfaces (18, 20) are formed and arranged on the bearing bodies (13, 14) or can be arranged such that a contact of the stop surfaces (18, 20) counteracts contact of the rollers (11, 12), - The first stop body (17) about a first axis of rotation (A1) is rotatable and the first stop surface (18) by a relative to the first axis of rotation (A1) eccentric peripheral surface (18) of the first stop body (17) is formed, so that the rotational position of the first stop body (17) determines the minimum width of the grinding gap. Roll pack (10) according to claim 1,
wherein the second stop body (19) is rotatable about a second rotation axis (A2) parallel to the first rotation axis (A1) and the second stop surface (20) is rotationally symmetrical with respect to the second rotation axis (A2) peripheral surface (20) of the second stop body (19). is formed. Roller package (10) according to one of the preceding claims,
wherein the first axis of rotation (A1) of the first stop body (17) and / or the second axis of rotation (A2) of the second stop body (19) is slidably disposed, in particular in a direction perpendicular to the first axis of rotation (A1). Roller package (10) according to one of the preceding claims,
wherein the roller package (10) has a handwheel (21) which is rotatable about a handwheel rotational axis (H) and which is coupled via a handwheel transmission (22) to the first stop body (17) such that rotation of the handwheel (21) rotates the first one Stop body (17) causes. Roller package (10) according to one of the preceding claims,
wherein the roll stack (10) comprises a force measuring device which contains: - A first sensor (24) for direct or indirect determination of a first force with which the first bearing body (13) and the second bearing body (14) are biased against each other; a second sensor (25) for determining, directly or indirectly, a second force which exists between the first stop body (17) and the second stop body (19) acts. Roller package (10) for a grinding device (70), comprising a first roller (11) and a second roller (12) and about a handwheel axis of rotation (H) rotatable handwheel (21), by means of which between the first roller (11) and the second roller (12) formed Mahlspalt is adjustable,
in particular roller package (10) according to claim 4, characterized in that
the roller package (10) has a position indicator (26) for indicating a position of the handwheel (21) and the position indicator (26) comprises a position indicator housing (27) and a display element (28) movable along the handwheel axis of rotation (H) relative to the position indicator housing (27) contains, which by means of a position indicator spring (29) in the direction of the handwheel axis (H) against the position indicator housing (27) is biased or biased that it is only by overcoming the by the position indicator spring (29) caused bias about the handwheel axis (H) is rotatable , Roller package (10) according to one of the preceding claims,
wherein the roller package (10) has an integrated roller device (30) with at least one roller (31) which is arranged or arrangeable on the roller packet (10) such that the roller packet (10) with the at least one roller (31) is horizontal Pad can be placed and moved on it. Roller package (10) according to one of the preceding claims,
wherein at least one of the bearing bodies (13, 14) comprises a rolling bearing (58) having a roller stub (33) of a the rollers (11, 12) is supported, wherein a bearing cap (63) of the rolling bearing (58) on its inner side (34) has a the roller stub (33) encircling guide groove (35) for lubricant, which is connected to an outlet opening (36) through which lubricant can escape from the guide channel (35). Roller package (10) according to one of the preceding claims,
wherein the first roller (11) is held by two first bearing bodies (13), the second roller (12) is held by two second bearing bodies (14) and the first bearing bodies (13) are independently adjustable and / or the second bearing bodies (13) 14) are independently adjustable. Grinding device (70), in particular milling mill (70), comprising a machine frame (71) and at least one roll package (10) according to one of the preceding claims, which is used or can be used in the machine frame (71). Grinding device (70) according to claim 10,
wherein the machine stand (71) has a clamping device (16) and the roller assembly (10) has a coupling device (66) arranged in particular on the second bearing body (14) for releasably coupling the roller package (10) to the clamping device (16). Grinding device (70) according to one of claims 10 and 11,
wherein the tensioning device (16) has a cylinder (40), in particular a bellows cylinder (40). Milling device (70) according to one of claims 10 to 12,
wherein the clamping device (16) at least one prestressed and in particular with the cylinder (40) connected in series spring (41). Grinding apparatus (70), in particular miller roller chair (70), comprising a machine stand (71) and at least one roll stack (10) having a first roll (11) and a second roll (12) which can be inserted or used in the machine stand (71), in particular grinding device (70) according to one of claims 10 to 13,
wherein the roll package has an integrated rolling device (30) with at least one roller (31) which is arranged or arrangeable on the roll package (10) such that the roll package (10) can be placed on a horizontal support with the at least one roll (31) movable on it,
characterized in that
the machine stand (71) has at least one rail (72) on which the at least one roller (31) of the roller package (10) can be moved during assembly and / or disassembly of the roller package (10), the roller assembly (10) at least one Contact surface (42, 76) and the machine stand (71) has at least one mating contact surface (73), and the contact surface (42, 76) and the mating contact surface (73) are matched to each other and to the at least one rail (72) the at least one roller (31) of the roll stack (10) does not rest on the rail (72) in an assembly position of the roll stack (10) due to at least one positive connection between the at least one contact surface (42, 76) and the at least one counter contact surface (73) , Method for determining the radial force acting between the rollers (11, 12) of a roller package (10) according to claim 5, comprising a step in which the between the force acting on the rollers (11, 12) is calculated from the forces determined by means of the sensors (24, 25). A method for operating a roll stack (10) according to one of claims 1 to 9, comprising a step in which the first bearing body (13) and the second bearing body (14) are biased against each other by means of the tensioning device (16) such that the first roller (11) and the second roller (12) are pressed towards each other. Process according to claim 16,
the method including a further step of rotating the first stopper body (17) about a first axis of rotation (A1) to adjust the minimum width of the refining gap.

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