JPH03181787A - Supporting device for rotary drum - Google Patents

Abstract

PURPOSE: To prevent the contact wear of each section of a rotary drum supporting device and the overload to a bearing, by supporting each support roller to intermediate rocker arms through each rocker arms and the intermediate rocker arms to an axial bearing with a play equal to or larger than the axial deviation between the support rollers. CONSTITUTION: Intermediate rocker arms 7 are provided on a supporting frame 4 around the axial center 5 of an axial bearing 6 and rocker arms 11 are respectively journaled to driving bearings 12 at both ends of each intermediate rocker arm 7. Then support rollers 14 are supported to each bridge section of the rocker arms 11 around the axial center of rotation 15. The driving bearing 12 is positioned to the center between both support rollers 14 and the related rocker arm 11 can swing around the vertical swinging center 13 of the bearing 12. The axial bearing 6 of the intermediate rocker arms 7 has an axial play 20 which is equal to or larger than the axial deviation between the support rollers 14 which appears when a rotary drum 2 is operated. Therefore, the occurrence of such a risk can be evaded that side edge loads which are harmful to the support rollers are generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides support rollers that roll in contact with the outer peripheral surface of a running ring on the outer periphery of a rotating drum that rotates around an axial rotation axis, and support rollers at both ends of swinging arms. The present invention relates to a support device for a rotating drum, mainly a rotary kiln, in which a swinging arm is swingably supported around an axis of an axial bearing on at least 41 support frames via an intermediate swinging arm.

A rotating drum in which the outer circumferential surface of the running ring is supported by a large number of support rollers so that the load on the outer circumferential surface of the running ring is distributed to a large number of support rollers, and therefore a rotating drum such as a rotary kiln is evenly supported on the outer circumferential surface. A support device is known from West German Patent No. 1,108°718. All the support rollers of this known support device are held horizontally in a common radial plane on rotating oscillating bearings. However, during operation of a large rotary kiln, small changes in the running ring appear due to the deformation and bending of the rotating drum and the running ring fixed to this rotating drum, and also due to thermal expansion of the rotating drum, and this position change is , the size varies across the outer circumferential surface of the running ring. This type of change in position of the running ring is particularly problematic when the ring is assembled from segments. In this case, detrimental lateral loads are applied to some of the support rollers, which tend to push all of the support devices of the rotating drum or one support roller out of the radial plane. The corresponding side edge loads induce relatively high contact wear on the rolling surfaces of the support rollers and on the outer circumferential surface of the running ring. Furthermore, the parasitic loads mentioned above can significantly load the rotating and oscillating bearings in question, resulting in overloads.

Therefore, it is an object of the invention disclosed in claim 1 to provide relatively little contact wear between the running ring and the support rollers, even though a large number of support rollers are provided on the outer circumferential surface of the running ring. The object of the present invention is to create a support device for a rotating drum of the above-mentioned type, in which the risk of overloading the bearings of the rollers, rocker arms and intermediate rocker arms is avoided.

This object is achieved by the features of claim 1.

With the bearing according to the present invention, each swinging arm can be tilted in response to the deformation and displacement of the running ring of the rotating drum, and can be arranged along the outer peripheral surface of the running ring. Furthermore, the rocker arm of the drum support member can be slid in the axial direction within the range of the axial play of the bearing of the intermediate rocker arm pivotally supported on the support cradle. The risk of harmful side loads on the support rollers if the running ring is deformed or changed position during operation is thus avoided.

The contact wear of the support roller when it comes into rolling contact with the outer peripheral surface of the running ring is correspondingly small. Since the sliding forces acting on the rotating bearing of the support roller, the oscillating bearing of the swinging arm and the oscillating bearing of the intermediate swinging arm are relatively small, these bearings are subject to overload even during severe operation of the rotating drum of the rotary kiln. Never.

Since the load acting on each support roller is relatively small, the diameter of the support rollers of the drum support device can be reduced, so that the support device can be installed in a small space under the rotating drum.

Advantageous embodiments of the invention are disclosed in the subclaims.

Claim 2 prevents the axial component of the contact force of the support roller on the pivot bearing from exerting a greater tilting torque on the associated rocker arm.

In this way, harmful side edge loads, which induce greater wear during rolling contact (line contact) of the support rollers, are avoided.

According to claim 3, the axial sliding force acting on the swinging arm in the direction of the rotational axis of the support roller tilts the intermediate swinging arm around one axis that crosses the rotational axis of the two support rollers. is prevented.

According to claim 4, in one intermediate rocking arm including the support roller, the axial force of the axial bearing, the axial force of the pivot bearing and the axial force of the support roller are applied horizontally in a common longitudinal plane. can be done.

The bearing of the intermediate rocker arm is thus essentially only acted upon by the radial supporting force and the axial guiding force of the support rollers, but not by the parasitic forces consisting of the tilting moment of the intermediate rocker arm.

According to claim 5, the intermediate rocker arm is guided and centered along the running ring in at least one of the two axial directions of the axis by means of a guiding element.

According to claim 6.7, it is possible to guide the intermediate rocker arm and the support roller along at least one of the two sides of the running ring in the axial direction with particularly low friction.

Based on claim 8, the pressing force of both guide rollers is
Since it acts at a relatively small distance from the axis of the axial bearing of the intermediate rocking arm, only a small tilting force from the pressing force acts on the axial bearing of the intermediate rocking arm.

According to claim 9, an axial bearing for pivotally supporting an intermediate rocking arm on a support frame can be manufactured particularly economically.

According to claim 10, the axial force of the support roller or the guide roller acting in the direction of the rotation axis of the rotary drum is transmitted to the support pedestal via the intermediate rocker arm.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

FIG. 1.2 shows one half of a support device for a rotary kiln (rotating drum). Each half is arranged symmetrically on either side of a vertical plane 3 containing the axial rotation axis of the rotary drum 2 so as to act on a common running ring 1 fixed to the rotary drum 2. Each half has an intermediate rocker arm 7 pivotably supported on the support pedestal 4 about an axial axis 5 of an axial bearing. The downward load of the heavy rotating drum 2 is transmitted from the running ring 1 to the support frame 4 via the axial bearing 6.

The running ring I is composed of transversely and longitudinally divided arcuate segments made of hardened or modified curved rolled steel. The segments are assembled in such a way that longitudinal dividing joints are created with mutual offset on the circumferential surface of the running ring l. The segments are secured to each other and to the side flanges 9 of the rotating drum 2 by mating bolts 8 that engage slotted holes in the segments (FIG. 3). Since the inner circumference of the running ring 1 is flexibly supported by the rotating drum via the wavy spring plate 10, it can slide somewhat in the radial direction when a load is applied to the flat contact surface of the flange 9. .

At both ends of each intermediate swing arm 7, a swing arm 11 is swingably supported on a pivot bearing 12, respectively.

The pivot bearing 12 has a pivot center 13 and has only the sliding play necessary for its function and essentially no supporting play.

Both identical rocking arms 11 of the intermediate rocking arm 7 have two ends arranged one after the other in the circumferential direction of the running ring l.

At each end, support rollers 14 are provided with two rows of rolling bearings (
For example, it is rotatably supported by a tapered roller bearing). The rolling bearing has a rotation axis 15 extending parallel to the rotation axis of the rotating drum 2. The support roller 14 is rotatably supported at each end of the swinging arm 11 by rolling bearings so as to be rotatable around the rotation axis 15 without any play in the axial direction.

The pivot bearing 12 of each swinging arm 11 is connected to both support rollers 14
placed in the center between. The associated rocker arm 11 can be swung around the longitudinal pivot center 13 of the pivot bearing 12 and can be tilted somewhat and thus automatically adjusted along the circumference of the running ring 1 . In this case, the essentially cylindrical outer circumferential surface 16 of the support roller 14 rolls on the cylindrical or, in cross-section, somewhat convex outer circumferential surface 17 of the running ring 1 .

The rotation axes 15 of the two support rollers 14 and the axis 5 of the axial bearing 6, which are pivotally supported by the rocking arm 11 and adjacent to the outer peripheral surface of the running ring l, are horizontally arranged in a common axial vertical plane 18. ing.

Furthermore, the pivot center 13 of the pivot bearing 12 also lies on this common longitudinal plane 18. The pivot center 13 is thus in the vicinity of the straight line 19 connecting the rolling contact points of the two support rollers 14 of the associated rocker arm 11.

The two intermediate rocker arms 7 of the support device each receive the loads of four support rollers 14 . The axial bearing 6 of the intermediate rocker arm 7 receives the load and has an axial play 20 that is equal to or greater than the axial displacement of the support roller 14 that occurs during operation of the rotating drum 2.

In this embodiment, the axial bearing 6 is formed from two plain bearing bushes arranged coaxially and spaced apart from each other along a cylindrical axle bolt 21 on the support frame 4 . A shaft bolt 21 is provided on the cylindrical inner periphery of each sliding bearing bush.
The condylar end 22 of the shaft is engaged. An intermediate swing arm 7 is fixed to the shaft bolt 21 by welding 23 between the two sliding bearing bushes.

The axial play 20 of the axial bearing 6 is caused by the intermediate rocking arm 7
are defined by end faces 24 and 24, said end face 24 cooperating with an opposing axial face 25 of the plain bearing bushing.

Following the outer circumferential surface 17 , the running ring 1 has on both sides flat annular side surfaces 26 oriented axially outwards and perpendicular to the axis of rotation of the rotating drum 2 .

In order to center the support roller 14 on the outer circumferential surface 17 of the running ring 1, guide elements are provided which are fixed to the intermediate rocker arm 7 and abut against each said side surface 26, if necessary in a prestressed state.

In this embodiment, the guide element is formed by a guide roller 27 which, viewed in longitudinal section, is displaced on each side 26 with a somewhat convex outer surface.

Each guide roller 27 respectively shifts over the two outwardly facing sides 26 of the running ring 1 . Both guide rollers 27 are attached to the fixing bolt 28 of the intermediate rocker arm 7 by sliding or rolling bearings (not shown) and are therefore rotatably supported around the axis 29 of the bolt 28. There is.

The rotation axes 29 of both guide rollers 27 are connected to the rotating drum 2.
is perpendicular to the rotation axis of the intermediate swing arm 7 and the axis 5 of the intermediate swing arm 7.

The embodiments described above can be modified within the scope of the invention. Thus, in an extreme case, the pivoting center of the pivot bearing can be located on a straight line connecting the rolling contact points of the two support rollers of the rocker arm. For this purpose, the pivot bearing must be configured accordingly. For example, the pivot bearing can be formed from a pivot bearing shell which is arranged laterally to the running ring and has the same effective pivot center as the running ring, or from a pivot bearing with a slit in the direction of the running ring. can. In this case, the running ring projects radially from the outside to the inside into the slot of the pivot bearing.

Furthermore, instead of the guide rollers, inside both sides of the running ring,
A sliding shoe can be coupled to each intermediate rocker arm which is slidable on at least one side surface and thus holds the intermediate rocker arm together with the rocker arm and the support roller in the correct position above the outer circumferential surface of the running ring.

The guide element does not have to be provided on the intermediate rocker arm, but can also be formed directly on the support roller. In this case, a flanged ring protruding from the outer surface of the support roller and sliding on the opposite side surface of the running ring is provided on one or both sides of the outer surface.

However, the radial shifting contact force between the support roller and the running ring not only aligns the swing arms and support rollers circumferentially of the support ring, but also centers them axially on the outer circumference of the running ring. If this is sufficient, the flanged rings of the guide elements, guide rollers, sliding shoes or support rollers can also be eliminated.

At one end or both ends of each intermediate swinging arm, the intermediate swinging arm is further pivotably supported on a support frame with some axial play. An intermediate swinging arm may also be provided.

When manufacturing a support device that fixes the rotating drum in the axial direction, the guide roller of the intermediate swinging arm can be directly supported by a support roller or the like fixed to the support frame, and the guide roller that acts in the direction of the rotation axis of the rotating drum can be used. The contact force of the rollers does not load the associated intermediate rocker arm.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a half of an embodiment of a rotating drum support device according to the present invention, and FIG. 2 is a plan view of the intermediate swinging arm shown in FIG. (The pedestal and guide rollers are not shown) 2 Figure 3 shows line B-B in Figure 1.
FIG. l is the running ring, 2 is the rotating drum (rotary kiln)
, 4 is a support frame, 6 is an axial bearing, 7 is an intermediate swing arm, 11 is a swing arm, 12 is a pivot bearing, 14 is a support roller,
Reference numeral 17 indicates the outer circumferential surface of the running ring, and reference numeral 20 indicates play in the axial direction.

Claims (10)

[Claims] (1) Support rollers that roll in contact with the outer peripheral surface of a running ring on the outer periphery of a rotating drum that rotates around the rotational axis in the axial direction are supported at both ends of the swinging arm, and the swinging arm is connected to the swinging arm via an intermediate swinging arm. In a support device for a rotating drum that is rotatably supported around an axis of an axial bearing on at least one support frame, each support roller (14) is rotatable around an axis of rotation (15), Each swing arm (11) is pivotally supported at each end of the swing arm (11) so as not to tilt and without any play in the axial direction, and each swing arm (11) is
At each end of the intermediate swinging arm (7), both support rollers (14
) is pivoted without support play on a drive bearing (12) with a pivot center (13) located between A support device for a rotating drum, characterized in that it is supported on an axial bearing (6) with an axial play (20) equal to or greater than the axial deviation appearing in the roller (14). (2) The pivot center (13) of the pivot bearing (12) is arranged on or near the straight line (19) connecting the rolling contact points of the two support rollers (14) of the swinging arm (11). 2. The rotating drum support device according to claim 1, wherein: (3) A traveling ring (
The rotation axes (15) of the two support rollers (14) adjacent to the outer circumferential surface of 1) and the axis (5) of the axial bearing (6) of the intermediate rocking arm (7) are aligned in a common axial direction. Vertical plane (1
8) A supporting device for a rotating drum according to claim 1 or 2, characterized in that the device is arranged horizontally within a rotary drum. (4) The center of rotation (13) of the pivot bearing (12) lies within a common axial longitudinal plane (18) of the rotation axis (15) of the two support rollers (14) of one rocking arm (11). 4. The rotating drum support device according to claim 3, wherein the rotating drum supporting device is arranged horizontally. (5) In the support device for a rotating drum according to any one of claims 1 to 4, the running ring axially abuts the guide element on at least one side of both sides thereof. The guide element (27) has an annular side surface that abuts against the support roller (14) with respect to the outer circumferential surface (17) of the running ring (1).
) is fixed to an intermediate rocking arm (7) for centering the rotating drum. (6) A guiding element is rotatably journaled on the intermediate rocker arm (7) and is mounted on one or both sides (26) of the running ring (1).
6. The rotating drum support device according to claim 5, characterized in that it is formed from a guide roller (27) rolling on the rotating drum. (7) The running ring (1) has side surfaces (26) facing axially outwards on both sides following its outer circumferential surface (17), and for each side surface (26) a guide roller (27) is provided. 7. The rotating drum support device according to claim 6, characterized in that it is pivotally supported by one intermediate swinging arm (7). (8) The rotation axis (29) of both guide rollers (27) is aligned with the rotation axis of the rotating drum (2) and the guide roller (2).
Claim 7, characterized in that the intermediate swing arm (7) is arranged perpendicularly to the swing axis (5) of the intermediate swing arm (7) connected to the swing arm (7).
A rotating drum support device as described in paragraph. (9) The axial bearing (6) of the intermediate rocker arm (7) is formed from two cylindrical plain bearing bushes coaxially juxtaposed on the support cradle (4), said bushings being intermediate between said bushings. A cylindrical shaft bolt (21) fixed to the swinging arm (7)
) The supporting device for a rotating drum according to any one of claims 1 to 8, characterized in that it cooperates with a support device for a rotating drum. (10) The axial play (20) of the axial bearing (6) of the intermediate rocking arm (7) is fixed to the intermediate rocking arm (7);
10. Support device for a rotating drum according to claim 9, characterized in that it is defined by a side surface (24) in sliding cooperation with an axial surface (25) facing the plain bearing bush.