EP3408029B1 - Carrying device and method for frontal removal of a roller body from a roller mill and roller mill with a roller body which can be removed from the front - Google Patents

Description

The invention relates to a support device for frontal removal of a roller body from a roller frame, a roller frame with a roller body that can be removed from the front, and a method for frontal removal of a roller body from a roller frame.

Various solutions for removing rollers from a roller frame are currently known, which are overall unsatisfactory. An example is given in EP-2662143-A2 disclosed.

The roller can be removed together with the roller stubs. All parts attached to the roller stubs such as belt pulleys and couplings for the gear unit connection or direct drive must be removed before the roller is removed from the roller frame with a crane or a stand. The roller frame must be designed so that the roller with the roller stubs can be removed. Possibly. further components must be removed from the roller mill. The roller is usually completely replaced, which is very costly and time-consuming.

The roller can also be removed together with the roller stubs and the adjustment and bearing mechanism. All parts attached to the roller stubs such as belt pulleys and couplings for the gear unit connection or direct drive must be removed before the roller is removed from the roller frame with a crane or a stand. The roller frame must be designed so that the roller with the roller stubs can be removed. Possibly. further components must be removed from the roller mill. The roller is usually completely replaced, which is very costly and time-consuming.

To avoid the disadvantages mentioned above, the WO 2005/102531 A1 propose to remove only the roll shell. The roller stubs are moved apart and the roller shell is lifted and removed from the roller frame. The roller or the roller shell must be accessible from above. This is not possible with all roller mills, especially when several grinding stages are arranged one above the other. Furthermore, the roller frame is often also fed from above. In such a case, too, components may have to be removed first. Such a solution is also only suitable for single-stage roller mills with rollers of smaller dimensions (diameter up to 25 cm and length up to 1 m).

It is therefore the object of the invention to provide a device of the type mentioned at the beginning, which avoids the disadvantages of the prior art and in particular allows an uncomplicated, time and cost-saving removal of a roller body even with multi-stage roller mills.

The object is achieved by a support device according to independent claim 1.

The support device according to the invention comprises a base frame and a receiving section for the roller body, which can be transferred from an insertion position into a support position. The receiving section has a course which at least partially encompasses the roller body in the support position. With the receiving section in the insertion position, the support device can be pushed in below the roller body, with the Receiving portion is carried in the supporting position of the roller body.

A “frontal removal” of a roller body in the sense of the present invention means that the roller body can be removed from a roller frame essentially vertically (horizontally), apart from tolerable deviations

In the context of the present invention, a "course of the receiving section which at least partially encompasses the roller body" means a course in which the roller body is prevented from rolling down with the receiving section in the support position. The receiving section can be designed such that in the supporting position the roller body is supported at at least two support points which, viewed radially of the roller body, are located on both sides of a perpendicular running through the axis of the roller body. In other words, the at least two support points must be arranged higher than the lowest point of the roller body (outermost radial dimension in the perpendicular direction). If the roller body shows an imbalance, this applies accordingly, taking into account the center of gravity. The support points can be formed, for example, by two rods which, when used as intended, extend parallel to the roller axis. The receiving section can also have a course which, in the supporting position, forms a recess for receiving the roller body. The shape or the course of the recess does not necessarily have to correspond to the curvature of the roller body. It is possible, for example, for the receiving section to allow the receiving of roller bodies of different diameters. It can happen that roller bodies with a small diameter have play when the receiving section is in the support position and the roller body is supported becomes. It is only important here that the receiving section surrounds the roller body in such a way that the roller body cannot unintentionally leave the receiving section, for example due to vibrations or inertia during removal.

The height difference between the support points and the lowest point of the roller body in the perpendicular direction is preferably more than 5% of the roller body diameter, more preferably more than 25% of the roller body diameter and particularly preferably between 25% and 40% of the roller body diameter.

The receiving section can preferably have a course with a radius of curvature which can be greater than the radius of curvature of the roller body.

The receiving section further preferably has a course with a curvature which corresponds to the curvature of the roller body. The weight can thus be distributed over the entire contact surface of the receiving section. This in particular avoids damage to the roll surface. Furthermore, such a course enables an automatic centering and positioning of the support device when the receiving section is moved from the insertion position into the support position.

The base frame preferably has an essentially L-shaped shape with two legs at an angle to one another, the receiving section being pivotably mounted in an end region of a leg, preferably the shorter leg.

This preferred embodiment is particularly easy to manufacture since the receiving section is pivotably mounted on the base frame and cannot be guided in a complex manner.

Preferably, one leg, preferably the longer leg, has guide means, preferably designed as rollers. The guide means serve to guide the support device when the support device is pushed in below the roller and are preferably designed to be complementary to further guide means of the roller frame. This is preferably realized by rollers which interact with a suitably designed guide rail of the roller frame.

The receiving section can preferably be moved between the insertion position and the support position by means of actuating means. Although manual transfer of the receiving section is possible, the actuating means preferably comprise mechanical, hydraulic or pneumatic actuating means due to the weight of the roller body. In addition to the above-mentioned possibility of pivoting the receiving section, further configurations are conceivable in this context, such as with a scissors joint, with a vertical guidance of the receiving section, etc. Actuating means occurs.

The actuating means preferably comprise a threaded rod. Such a configuration can be produced particularly inexpensively, can also be operated manually and is self-locking if the pitch of the thread is suitably dimensioned.

The threaded rod is preferably mounted in a threaded bushing, the threaded bushing being mounted in the same leg of the base frame as the receiving section. In this preferred embodiment, the threaded bush acts as an abutment when the threaded rod is actuated and absorbs any axial force that may arise.

The threaded rod is preferably connected at one end to an expansion joint so that it can rotate but is tension and compression-proof, the expansion joint being able to be expanded and the receiving section being transferable from the insertion position to the supporting position by rotating the threaded rod. By rotating the threaded rod, an axial force is generated - with respect to the threaded rod axis. Since the threaded bushing is received as an abutment in the base frame, the axial force causes the expansion joint to expand, after which the receiving section is moved and transferred from the insertion position to the support position.

The expansion joint preferably comprises three joint sections arranged around a common axis of rotation, a first joint section being connected to the threaded rod and the remaining joint sections being pivotally connected to the base frame and the receiving section. Thus, by transmitting forces from the threaded rod via the first joint portion, the remaining two joint portions can be moved apart, after which the receiving portion is also moved.

This is preferably done by increasing the distance between the threaded bushing and the end of the threaded rod which is connected to the expansion joint.

The threaded rod is preferably equipped with means for receiving a drive. The means can be designed as a receptacle for a drive shaft, for example as a square or hexagon. The drive itself can be, for example, an electric motor, a pneumatic drill or a ratchet, the drive shaft of which can be inserted into the receptacle. Alternatively, the receptacle can also be designed as a screw nut, so with a The threaded rod can be rotated with a wrench or a ratchet with a corresponding attachment.

Means are preferably provided for limiting the pivoting movement of the receiving section. In particular when transferring the receiving section into the supporting position, it can happen that the receiving section is tensioned too high against the roller surface. Such a tension can not only damage the surface of the roller but also bias the roller body against the roller stubs in such a way that removal is not possible or that when the roller stubs are moved apart, the roller body is pressed upwards and falls out of the receiving section.

The invention further relates to a roller frame with a plurality of rollers, at least one roller comprising a roller body with two roller stubs, the roller body being releasable by moving the two roller stubs apart relative to one another.

According to the invention, guide means for a roller support device are arranged below the at least one roller, such that the roller body can be removed from the front and the roller support device can be moved in a direction perpendicular to the roller axis. The roll support device is preferably the roll support device described above.

The guide means enable the support of the roll support device on a frame of the roll frame and the guidance of the roll support device along the same guide means, so that no external devices such as a crane are required to remove the roller body.

The guide means preferably enable the roll support device to be guided vertically. This ensures that when the roller body is released, the roller support device together with the roller body can slide out of the roller frame in an uncontrolled manner by gravity. Alternatively, it is possible for the guide means to be designed to be slightly inclined, for example, so that when the roller body is released, removal of the roller support device is supported and simplified by gravity. Conversely, it is conceivable that a corresponding inclination of the guide means by gravity ensures that the roller support device is correctly positioned below the roller when it is pushed in and that, after the roller body has been released, an unintentional sliding out of the roller support device with the roller body is counteracted.

The guide means preferably comprise at least one guide rail. The guide rail is designed to be complementary to the roll support device, so that, apart from tolerable play, movement of the roll support device in a direction perpendicular to the roll axis (and preferably perpendicular thereto) is possible.

The guide means are preferably arranged or can be arranged in a product space. In the context of the present invention, “product space” is understood to mean the space of the roller frame in which the rollers are arranged and a product passes through (including a feed area and an outlet area). As a rule, the product space is separated, preferably sealed, from other areas of the roller frame in terms of product flow.

• Einführen wenigstens einer Walzentragvorrichtung mit einem Aufnahmeabschnitt für den Walzenkörper unterhalb der Walze, wobei die wenigstens eine Walzentragvorrichtung auf einem Rahmen des Walzenstuhls ruht;
• Anheben des Aufnahmeabschnittes der wenigstens einen Walzentragvorrichtung derart, dass der Walzenkörper in Wirkverbindung mit der Walzentragvorrichtung ist und von dem Aufnahmeabschnitt zumindest teilweise beidseitig umfasst wird;
• Freigeben des Walzenkörpers durch Auseinanderbewegung beider Walzenstummel, so dass der Walzenkörper auf der wenigstens einer Walzentragvorrichtung ruht;
• Bewegen der wenigstens einen Walzentragvorrichtung senkrecht und bevorzugt auch lotrecht zur Walzenachse.

The invention further relates to a method for frontal removal of a roller body from a roller frame with a plurality of rollers, at least one roller comprising a roller body with two roller stubs and wherein the roller body can be released by moving the two roller stubs relative to one another, comprising the following steps:

• Introducing at least one roller support device with a receiving section for the roller body below the roller, wherein the at least one roller support device rests on a frame of the roller frame;
• Lifting of the receiving section of the at least one roller support device in such a way that the roller body is in operative connection with the roller support device and is at least partially encompassed on both sides by the receiving section;
• Releasing the roller body by moving the two roller stubs apart, so that the roller body rests on the at least one roller support device;
• Moving the at least one roller support device perpendicular and preferably also perpendicular to the roller axis.

The method according to the invention is preferably carried out with a device according to the invention.

The implementation of the method according to the invention has already been described above with respect to the device according to the invention or the roller mill according to the invention, so that advantages and preferred exemplary embodiments mentioned in this regard can be applied accordingly to the method according to the invention.

Fig. 1

eine bevorzugte Ausführungsform der erfindungsgemässen Walzentragvorrichtung in einer Einfuhrposition;

Fig. 2

die Walzentragvorrichtung der Figur 1 in der Stützposition;

Fig. 3

eine perspektivische Ansicht der Walzentragvorrichtung der Figur 2;

Fig. 4

eine perspektivische Ansicht einer Walzenmühle;

Fig. 5

eine perspektivische Ansicht der Walzenmühle der Figur 4 mit sichtbaren Schienen für die Walzentragvorrichtung und Walzentragvorrichtungen; und

Fig. 6

eine schematische, seitliche Schnittansicht der Walzenmühle der Figur 5.

In the following, the invention is better described using a preferred exemplary embodiment in conjunction with the drawing. Show it:

Fig. 1

a preferred embodiment of the inventive roll support device in an insertion position;

Fig. 2

the roll support device of Figure 1 in the support position;

Fig. 3

a perspective view of the roll support device of FIG Figure 2 ;

Fig. 4

a perspective view of a roller mill;

Fig. 5

a perspective view of the roller mill of FIG Figure 4 with visible rails for the roll support device and roll support devices; and

Fig. 6

a schematic, side sectional view of the roller mill of Figure 5 .

In the Figures 1 and 2 a roller support device, each in an insertion position E and a support position S, is shown laterally. The roll support device of the Figure 2 is in the Figure 3 shown in perspective.

The support device 1 is composed of a base frame 2 and a receiving section 3 for the roller.

When viewed from the side, the base frame 2 has an L-shaped profile with a long, essentially horizontally extending leg 21 and a shorter, essentially vertically extending leg 22. A reinforcing strut 23 connects both legs 21 and 22 and gives the construction stability. Rollers 4 are at both ends of the leg 21 arranged and thus allow the displacement of the support device 1. The roller 4 arranged in the area of the connection between the two legs 21 and 22 is supported by the axle 41. The other roller 4, which is arranged at the end of the long leg 21, is supported by an axle 42.

The receiving section 3 has a curved course and is mounted at the free end of the short leg 22 on a pivot axis 24 and thus from an insertion position E, in which the free end of the receiving section 3 is lower than the lowest point of the roller to be removed, into a Support position S transferable, in which the roller to be removed is supported on both sides against rolling down.

As from the Figure 3 Visibly, the base frame 2 consists of two mirror-symmetrical parts, which are kept spaced apart by spacer sleeves which are each pushed onto the axle 41 and 42. The receiving section 3, which also serves as a spacer, is arranged between the two parts.

To operate the support device 1 means 5 are provided which ensure the safe support and displacement of the roller. In this preferred exemplary embodiment, the means 5 comprise a threaded rod 6 which is rotatably mounted in a threaded bushing 7. The threaded bushing 7 is arranged in a cutout 13 of the short leg 22. The cutout 13 enables the axial transmission of forces with respect to the threaded rod 6, but is profiled in such a way that the threaded rod 6 can be pivoted about an axis perpendicular to the threaded rod axis in order to follow a change in the height of an end 8 of the threaded rod 6. The remaining end of the threaded rod 6 is provided with a T-shaped handle 14.

In order to enable the pivoting of the receiving section 3, the end 8 of the threaded rod 6 cooperates with an expansion joint 9. In this exemplary embodiment, the expansion joint 9 comprises three joint sections 91, 92 and 93, which are mounted pivotably about a common axis 10. The joint section 91 is equipped with a swivel joint 81, which receives the end 8 of the threaded rod 6, enables rotation of the threaded rod 6 and - with respect to the threaded rod axis - also enables axial transmission of forces. The remaining joint sections 92 and 93 are each in operative connection with the support frame 2 and the receiving section 3. The joint section 92 can be pivoted about the axis 42. The joint section 93 is also mounted pivotably with the receiving section 3 via the axis 31.

The joint section 92 also fulfills the function of a spacer for the base frame 2.

By turning the threaded rod in the corresponding direction of rotation, the distance between the end 8 of the threaded rod 6 and the threaded bushing 7 can be increased or decreased, after which the receiving section 3 can be raised or lowered. In the area of the axis 31, the receiving section 3 has a protruding nose 11 which, together with the receiving section 3 in the support position, experiences a stop against a bolt 12 of the joint section 93 and limits the movement of the receiving section 3.

In the Figure 4 a roller mill 50 is shown schematically. A roller 51 is indicated with an arrow. The roller 51 (and one in the Figure 4 Roller 51 '(not visible) comprises a roller body 52 which is carried by two roller stubs. The Roller stubs are designed in such a way that they can be moved apart axially with respect to roller 51 or 51 ', so that roller body 52 is released.

Guide rails 53 can be arranged below the rollers 51 and 51 'in a product space 55. This is in the Figures 5 and 6 visible, with the Figure 6 the second roller 51 'is also shown schematically.

A guide rail 53, which is designed to accommodate and guide a support device 1, is arranged below each end region of the roller body. In the Figures 5 and 6 a support device 1 is arranged on the guide rail 53.

The guide rail 53 and the support device 1 are matched to one another in such a way that the support device 1 can only be displaced along the guide rail, apart from a tolerable lateral play, in the direction perpendicular to the roll axis. Furthermore, the guide rails 53 are arranged perpendicular to the rollers 51 and 51 ′, so that when the roller body 52 is released, it cannot roll out of the roller frame 50 in an uncontrolled manner.

To remove the roller body 52 from the roller 51, a support device 1 is inserted into the corresponding guide rail 53 and arranged below the roller body 52 in the product space 55. It goes without saying that the receiving section 3 should be in the insertion position E, since otherwise the positioning of the carrying device 1 would not be possible anyway. After the support device 1 has been arranged below the roller body 2, the receiving section 3 is raised into the support position S and then the roller body 52 is moved apart the roller stub released. The roller body 52 can then be removed from the roller frame 50.

After the roller body 52 has been removed from roller 51, the same procedure can be followed for roller 51 '.

Claims (16)

1. Carrying device (1) for frontal removal of a roll body from a roll mill, comprising a main frame (2) and a receiving section (3) for the roll body, which can be transferred from an introduction position (E) into a supporting position (S), wherein the receiving section (3) has a profile which encloses the roll body at least partly in the supporting position (S), and wherein the carrying device (1) can be pushed in below the roll body with the receiving section (3) in the introduction position (E) and the roll body is carried with the receiving section (3) in the supporting position (S).
2. Carrying device (1) according to Claim 1, characterized in that the main frame (2) has a substantially L-shaped form with two legs (21, 22) standing at an angle to each other, wherein the reiving section (3) is pivot-mounted in an end region of one leg, preferably the shorter leg (22) .
3. Carrying device (1) according to Claim 2, characterized in that one leg, preferably the longer leg (21), has guiding means, preferably configured as rollers (4).
4. Carrying device (1) according to one of the preceding claims, characterized in that the receiving section (3) can move by actuating means (5) between the introduction position (E) and the supporting position (S).
5. Carrying device (1) according to Claim 4, characterized in that actuating means (5) comprise a threaded rod (6).
6. Carrying device according to Claim 5 and one of Claims 2 to 3, characterized in that the threaded rod (6) is mounted in a threaded bushing (7), wherein the threaded bushing (7) is mounted in the same leg (22) of the main frame (2) as the receiving section (3).
7. Carrying device according to Claim 6, characterized in that the threaded rod (6) is connected at one end (8) to an expanding joint (9) in a way that is rotatable, yet firm against pushing and pulling, wherein the expanding joint (9) is expandable by rotating of the threaded rod (6) and the receiving section (3) can be transferred from the introduction position (E) into the supporting position (S), wherein the expanding joint (9) comprises in particular three joint segments (91, 92, 93) arranged about a common pivot axis (10), wherein a first joint segment (91) is connected to the threaded rod and the other joint segments (92, 93) are connected pivotably to the main frame (2) and the receiving section (3), respectively.
8. Carrying device (1) according to Claim 7, characterized in that the receiving section (3) can be transferred from the introduction position (E) into the supporting position (S) by increasing the distance between the threaded bushing (7) and the end (8) of the threaded rod (6) which is connected to the expanding joint (9).
9. Carrying device (1) according to one of Claims 5 to 8, characterized in that the threaded rod (6) is outfitted with means (14) for accommodating a drive unit.
10. Carrying device (1) according to one of the preceding claims, characterized in that means (11, 12) for limiting the movement of the receiving section (3) are provided.
11. Roll mill (50) with a plurality of rolls (51, 51'), wherein at least one roll comprises a roll body (52) with two roll stubs, wherein the roll body (52) is releasable by moving apart the two roller stubs from each other,
    characterized in that
    beneath the at least one roll (51) guiding means (53) for a roll carrying device (1), preferably a device (1) according to one of the preceding claims, are arranged such that the roll body (52) can be removed frontally and the roll carrying device (1) is movable in a direction perpendicular to the roll axis.
12. Roll mill (50) according to Claim 11, characterized in that the guiding means (53) enable a square guiding of the roll carrying device (1).
13. Roll mill (50) according to Claim 11 or 12, characterized in that the guiding means (53) comprise at least one guide rail.
14. Roll mill (50) according to one of Claims 11 to 13, characterized in that the guiding means (53) are arranged in a product space (55).
15. Roll mill (50) according to one of Claims 11 to 14, characterized in that the guiding means (53) are releasably arranged beneath the at least one roll (51) in such a way that the guiding means (53) allow the roll carrying device (1) to be supported on a frame of the roll mill (50).
16. Method for the frontal removal of a roll body (52) from a roll mill (50) with a plurality of rolls (51, 51'), wherein at least one roll comprises a roll body (52) with two roll stubs and wherein the roll body (52) is releasable by moving apart the two roll stubs from each other, comprising the following steps:

    - introducing at least one roll carrying device (1) with a receiving section (3) for the roll body underneath the roll (51), wherein the at least one roll carrying device (1) is resting on a frame of the roll mill (50);

    - lifting of the receiving section (3) of the at least one roll carrying device such that the roll body (52) is in an operative connection with the roll carrying device;

    - releasing of the roll body (52) by moving apart the two roll stubs, so that the roll body (52) is resting on the at least one roll carrying device (1);

    - moving the at least one roll carrying device (1) perpendicularly and preferably also square to the roll axis.

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