DE2322579A1 - SUPPORT FOR ROTATING TUBE FURNACE - Google Patents

Description

Support for rotary kilns

The invention relates to rotary kilns, which essentially from a large diameter hoop with several on the bore length distributed races exist, which respectively rest on several rollers.

About the bending stress on the races and their strength To be able to reduce, it has already been proposed to each race ring four support rollers arranged in pairs assigned, the rollers of each pair of a rocker arm pivotable about an axis parallel to the roller axis are worn; by this arrangement, the load on the rollers can be evenly distributed.

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OFUGlNAL JNSPECTiD

For uniform distribution of the contact pressure on the entire width of the tread patent no. 2599189 of the United States of America proposes to arrange the axis of the rocking lever on a support which is pivotable about a vertical to the rocking lever axis so that a gimbal is provided . The disadvantage here is that the practical implementation of such a cardan joint is very heavy and expensive under the high loads.

On the other hand, in this case, as in the known solutions _t, the parallelism of the tunnel axes and furnace axis is set during assembly. This setting is difficult because it is done by moving the support frame of the cliffs on the foundation. For the same reason, further adjustments can only be made after the furnace and its supports have been raised, which is a lengthy and difficult job.

To achieve the same goal, United States Patent No. 2269700 makes the ί proposal to lower the axis of the rocker arm at the end of ^; to arrange right post so that it can swing around a central position. This solution leads to underframes of great height and makes it practically uniform

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Load distribution between the various supports of the furnace, because any change in the inclination of the posts, for example as a result of thermal expansion This furnace entails a change in the position of the rollers concerned in relation to their height.

I'm another goal stroke (French patent No. 1220828) goes to locating the rocker arms inside open boxes with each rocker arm overhanging spherical bearing surfaces on the floor and on the side walls of the box and the spherical surfaces have a common Have focus. This structure theoretically enables the rocker arm to be freely adjusted all directions. However, due to the larger radius of the spherical surfaces, the strong effect of the frictional forces is unfavorable, which oppose the angular movements of the rocker arm, which balances the load for the two Rolling of one and the same rocker arm and an even distribution of the contact pressure over the entire width the running surfaces prevented.

In addition, it is very difficult to assemble the three center points of the three spherical bearing surfaces To take cover, and it is practically impossible to keep them under cover if the box moves as a result of the

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Stress and heat expansion deformed so that on joint created in this way is imperfect.

The invention is based on the object of a simple and To create a relatively inexpensive design for mounting the rocking lever on the substructure, so that the rocking lever can align itself freely, a load compensation for the clutches and an even distribution of the contact pressures over the entire width of the running surfaces can be created despite deformations and manufacturing defects in the furnace and running ring.

This object is achieved according to the invention in a support for Rotary tube furnaces with two rollers arranged at the ends of a rocker arm resting on a substructure, solved in that the rocker arm rests on the substructure via an intermediate ball joint, the center of which is in the to the roller shafts perpendicular plane of symmetry of the rollers and equidistant from these roller axes and that the diameter of the ball joint is smaller than the width of the roller track

The ball joint advantageously consists of two concentrated

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tric rings, with the Iimenring on an am Rocker arm or arranged on the substructure axis and the outer ring on the substructure or on the rocker arm is attached j · this axis can be parallel to the roller lugs or perpendicular to them and exactly parallel be arranged to the plane containing them.

This solution enables one to be used in stores very common ball joint and is therefore more economical than the use of special parts requiring solutions. In addition, by using a ball joint with a relatively small diameter, the very disturbing influence of friction and thus reduced

the load distribution on the roles can be improved.

The outer ring of the ball joint is preferably on an intermediate frame attached to the substructure and between arranged on the side walls of the rocker arm and the axis carrying the inner ring is at two with the rocker arm connected webs attached that enclose the ball joint and relative movements of the rocker arm to Prevent substructure parallel to the axis.

According to another feature of the invention, the rocker arm consists of two puddles, which the bearings of the

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Bear roles and are stiffened by a box, and the ball joint is mounted in the box, the one has an opening for the passage of the fixed frame, wherein the axle carrying the inner ring of the ball joint is attached to the box. The box can on the splashing of the rocker arm by means of bolts or by. Welding to be attached.

The side walls of the box and the pool are with provided aligned bores of the same diameter in which sleeves are pressed; thereby the Splash to each other and to the box can be adjusted with accuracy. These holes are not aligned with the Inner ring of the axis bearing the ball joint, the inner diameter of the bush being larger for assembly reasons than is the axle diameter.

In another embodiment, this is the inner ring of the ball joint supporting axis extended to the splashing of the rocker arm and its ends are in the Pressed holes in the paddles and in the side walls of the box.

In certain cases where the stability of the rocker arm could be endangered, it is appropriate that the

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Rocker arm adjustable by a pull rod To connect the length with a fixed bracket, wherein the tie rod is articulated at its ends on the rocker arm and on the fixed bracket and prevents the rocker arm from rotating about an axis passing through the axis of the furnace and to the roller axes containing plane is perpendicular; in addition, the pull rod facilitates the adjustment of the parallelism of Bollen axes and furnace axis. The center of the joint between the pull rod and the rocker arm lies on a straight line through the center of the ball joint, which is parallel to the plane containing the roller axes, and runs perpendicular to these axes.

The tie rod is preferably connected to the rocker arm and the fixed bracket with the aid of ball joints. According to a preferred embodiment, the pull rod is arranged in the middle operating position parallel to the roller axes.

In order to keep the running surfaces of the rollers and the running ring in contact over their entire width even in the event of deformations of the furnace and defects on the raceway, the rollers can advantageously be arranged in such a way that they can move axially in their bearings.

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For example, the rollers can slide freely in their bearings

sit union axes and be provided with wreaths that lay on the sides of the race.

If the rollers are provided with two wreaths that are to put on the "both sides of the race, their way must be large enough for the furnace to contract as it cools,

The rollers can also be equipped with a single ring, which is operated by spring pressure or piston, by tilting the Support or the weight of the rollers is pressed against one side of the race. In this lall it is advantageous to place the rim on the side of the roller against which the furnace slides as it expands; that way is it is possible to limit the displacements of the rollers to the required extent, so that tension in the race and Expansion differences are compensated, because yes the roles are no longer taken axially by the furnace when it cools down

A non-limiting embodiment is shown in FIG Drawing shown and described in more detail below.

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Show it:

Pig. 1 is a view, partly in section and partly in elevation, a support according to the invention;

Pig. 2 shows a cross section through the support according to FIG. 1 in a plane through the center point of the ball joint;

Pig. 3 one of the pig. 2 similar view of another
Embodiment;

Pig. Figure 4 is a view, partly in section and partly in elevation, of another embodiment of the support after Pig. 1;

Pig. 5 is a view of another embodiment of FIG
Invention}

Pig. 6 shows a section through the Pig support. 5 in
a plane containing the axes of the lobes and the centers of the ball joints}

Pig. 7 is a side view of a modified embodiment of the Pig support. 5 in its normal Operating position; and

Pig. 8 those of the support according to Pig. 7 position assumed after the oven has cooled down.

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The support shown in Figures 1 and 2 is used to accommodate a race 10 of a rotary kiln in Connection to an identical device which is symmetrical with respect to a vertical plane containing the axis of the furnace is arranged o

This support consists essentially of two halls $ 14 which are attached to the ends of a rocker arm, which is mounted on a substructure 18 via an intermediate ball joint 20 rests, the center of which lies in the plane of symmetry of the rocker arm, which is perpendicular to the roller axes and equidistant from the roller axes.

The rocker arm consists of two puddles 22, which by a box 24 are stiffened. The flanges supporting the bearings of the rollers can also be part of the box, or from thick sheet metal or from a one-piece cast part The box 24 has a trapezoidal cross-section and is open at the bottom. It is stiffened by internal ribs and can be designed as a one-piece casting or welded together from sheet metal

The box can be attached to the flanges with screws or bolts or by welding.

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Each splash is aligned to the box by a sleeve 37, which is provided in the side walls of the box 24 and in the flanges 22. This arrangement facilitates the cultivation of the pool on the box during manufacture and allows prior to the attachment of this Elements a precise setting of the parallelism of the Bollen axes.

The ball joint 20 consists of two concentric rings 26 and 28. The outer ring 26 is in an intermediate frame 30 fitted, which is fastened with screws to the base 18; the position of this frame on the substructure can be adjusted with the help of stop screws 32 when the fastening bolts are loosened The frame 30 protrudes into the box 24, the ball joint being mounted in the box.

The inner ring 28 i · * mounted on an axle 34, the Ends are attached to two webs 36 of the box 24. The clear width between the webs is as large as the width of the ring 28, so that it is on the axis cannot move} so every movement of the rocker arm relative to the lower part is parallel to this axis prevented.

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The width of the ring 26 is! Thinner than the width of the Ring 28, so that the rocker arm oscillations with a small amplitude around the center of the ball joint can perform.

The inner diameter of the sleeves 37 is dimensioned so that the installation of the axle 34 can be carried out.

In the modified version according to Pig. 3 is the Axis 34 'extended on both sides of the ball joint and in holes in the side walls of the box 24' and in the splash 22 * of the rocker arm pressed in * on this one Embodiment, part of the forces are transferred directly from the splash to the axle, while in the embodiment described above, all forces are transmitted through the box to the axle.

The axis carrying the inner ring of the ball joint can be arranged perpendicular to the roller axes, as in Pig. 4 is shown. In this embodiment, the axis 34 ^{f1 is held} by caps 38 on supports 40 connected to the rocker arm.

Stops can be provided on both sides of the rocker arm be to limit its movement around the axis au that

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through the center of the ball joint hindurohgelit and runs perpendicular to the plane containing the lines of contact the rollers and the raceway contains

In the embodiment of the support shown in Figures 5 and 6, the rocker arm is on one of the Frame 46 supported ball joint 48, the center of which lies in the plane of symmetry of the rocker arm, which perpendicular to the axes of the rollers 42, equidistant from them, and close to that of the roller axes containing level or located in this level.

The rocker arm is connected to a stationary bracket 50 via a pull rod 52 of adjustable length. The pull rod is articulated on the rocker arm 44 and on the bracket with the aid of ball joints 54 and 56

The center of the ball joint 54 is in the plane of symmetry of the rocker arm on one of the center of the main ball joint 48 arranged parallel to the plane containing the axes of the rollers extending straight line.

In the middle operating position, the pull rod 52 is parallel to the axes of the rollers.

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Duroh this arrangement is a pivoting of the rocker arm possible around any axis passing through the center of the ball joint 48 and in which the centers of the three ball joints 48, 54 and 56 containing Level, and any other movement is excluded.

It can be seen that precisely the punctures of a cardan joint are fulfilled by this arrangement, whereby they can be carried out in the simplest way when it is applied to storage on double rollers

The rocker arm can therefore assume such a position, that the load on the two rollers is balanced and that the load is even along the lines of contact is distributed

So that the rollers by axial displacements the small relative movements of the race 40, for example as a result can follow his tension, they are equipped with rings 58 with little play on both sides of the running ring are arranged, and axles 60 are mounted, which can be moved freely in their bearings 62 »

The axes move in their bearing bushes

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without lubrication} the disturbing forces generated in this way are low and the distribution of the contact pressure along the contact line between roller and race is only due to this little affected.

The position of the ball joint 48 is shown in adjusted in such a way that, taking into account the thermal expansion of the furnace, the plane of symmetry of the lumps perpendicular to their axes with the central position of the rollers and normal operating condition of the furnace through the central points of the ball joints 48 and 54, i.e. coincides with the plane of symmetry of the rocker arm. By means of the pull rod 52, the parallelism of the sole axes can be achieved be adjusted to the running ring.

The axial path of the rollers must be large enough to allow the furnace to contract as it cools down Buzulassen.

To make it easier to move the rollers sideways when the furnace is shut down and cooled, it is advantageous to inject pressure oil into the bearing bushes of the rollers by known means.

Figures 7 and S illustrate a different

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leadership form, "in which the Hollen 42 'only with a wreath 58 * are equipped with a spring through a Druok piston by tilting the support, or simply by its own weight the roller pressed against the side of the race 40 ' is} the force P exerted on the roller must allow its return when it is pushed by the race. A Stop 70 limits the displacement of the roller under the action of the applied force. The wreath is on the The roller side is arranged against which the furnace moves when it expands

In normal operation, the rim is constantly pressed against the side of the running ring, and the roller follows the axial movements of the raceway · As the furnace cools, the stop 70 limits the movement of the roller and raceway then slide on it. The advantage of this solution is that the sliding of the axles in their bearings on the value can be limited, which is necessary to reduce the tension in the Laufring.ee and the expansion undershoots during operation as a result of, for example, the wear and tear of the inner lining of the furnace, ie. Shifts in the order of magnitude of a few centimeters to compensate, while the displacements due to the contraction of the furnace 15 cm can exceed.

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The invention eats applicable to rotary kilns, 'as used for the production of cement, the calcination of minerals etc..

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Claims (1)

Patent Attorneys - Dipl.-Ing. ICEMPt **. *. * Munich 80, Schumannatr. 2 jZ May 4th 1973 File; p 7578 Claims 1 ·) Support for rotary kiln with two at the ends of one Rollers arranged on a substructure rocking levers, characterized in that that the rocker arm rests on the substructure via an intermediate ball joint, the center of which is in the The symmetry plane of the rollers is perpendicular to the roller axes and at equal distances from the roller axles and that the diameter of the ball joint is smaller than the width of the track of the rollers 2.) Device for rotary kilns according to claim 1, characterized characterized in that the ball joint consists of two concentric rings, the inner ring on one arranged on the rocker arm or on the substructure attached Aohse and the outer ring is attached to the substructure or the rocker arm. - II - 30 * 3 ·) Support according to claim 2, characterized in that the axis carrying the inner ring of the ball joint is arranged parallel to the roller axes. 4 ·) Support according to claim 2, characterized in that the axis carrying the inner ring of the ball joint perpendicular to the Hollen axes and parallel to these axes containing level 1st. 5.) support according to claim 2, 3 or 4, characterized in that the outer ring of the ball joint on an am Substructure attached intermediate frames and between the ,! et side walls of the rocker arm arranged and that the the axle carrying the inner ring is attached to two webs connected to the rocker arm, which include the ball joint and relative movements of the rocker arm. prevent lever to the substructure parallel to this axis 6.) Support naoh claim 1, dadiurfeh characterized that the rocker arm has two puddles, which carry the bearings of the lumps and are stiffened by a box, and that the ball joint is mounted in the box, which has an opening for the passage of the fixed frame of the ball joint. 7.) Support according to claim 2 and 6, characterized in that - III - 309847/083 that the axle carrying the inner ring of the ball joint is attached to the box. 8.) Support according to claim 3 and 7, characterized in that that the axis carrying the inner ring of the ball joint is extended on both sides of the ball joint and its Ends are pressed into bores in the side walls of the fast and in the splash of the rocker arm. 9) Support according to claim 3 and 7, characterized in that the side walls of the box and the planes of the rocker arm have bores with the same diameter, which are aligned with the axis carrying the inner ring of the ball joint and into which bushes are pressed aind _r their inner diameter greater than is the diameter of the axis. 10 ·) support according to claim 1, characterized in that the rocker arm with a fixed bracket by an adjustable length pull rod is connected, which with its ends on the rocker arm and on the fixed bracket is articulated. 11.) support according to claim 10, characterized in that the center point of the joint between the pull rod and - IV 309847/0838 the rocker arm is arranged on a straight line that goes through the center of the ball joint, runs parallel to the plane containing the roller axes and is perpendicular to these axes. 12 ») Support according to claim 10 or 11, characterized in that that the pull rod runs parallel to the roller axes in the middle operating position, 13 ·) Support according to claim 1, characterized in that the rollers on the rocker arm are axially displaceable and equipped with rings by means of which they pass through the raceway can be moved. 14 ·.) Support according to claim 15 »characterized in that each roller has two wreaths, which lie on the two sides of the race. 15 ·) Support according to claim 13, characterized in that each roller has a single ring, which is pressed against one side of the race by a force, which allows the roll to return when it is hit by the raceway, with the rim on the side of the The role to which the furnace moves as it expands, 309847/0838 16.) Support according to claim 15 »characterized in that the displacement of the roller under the effect of this force by a stop in the manner is limited that the total axial path of the roller is smaller than that
is the maximum axial displacement of the race. 309847/0838 Lee rse ife