JPS582760B2 - Roll press for hot compression kneading of granular materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a roll press for hot compression kneading of granular materials, in which a mantle is provided on the core of the roll, and this mantle is composed of a large number of segments. , the axis-parallel longitudinal edges of the segments border each other in the circumferential direction,
The segment is detachably connected to the roll core at its end, and the support surface of the roll core and the support surface of the segment are formed as smooth cylindrical surfaces.

In hot compaction of granules, especially of prereduced iron ore without binder, the segments are exposed to temperatures exceeding 1000°C.

At such temperatures, significant problems arise in securing the segments to the roll core.

In the radially arranged screw fixation type, the fixing screw is formed as a relatively long tensile screw and is tensioned in such a way that it still retains a sufficient clamping force during thermal expansion at the working temperature. It is known to solve problems in working in high temperature ranges by keeping the temperature high (German Patent Application No. 1815599).

Furthermore, as a fixing member for the segment reservoir, a shrink-fitting ring is provided on the side steps of the segment and has an annular cooling medium passage that communicates with the cooling medium passage provided in the roll core for supplying and discharging the cooling medium. Shrink fitting is also known.

With the fixation of the segments by shrink-fit rings, the press roll must be removed from the roll press in order to replace the segments.

This is because once the shrink-fit ring has been shrink-fitted, it cannot be pulled out or shrink-fitted again to a new segment.

Furthermore, in a press roll for hot kneading having a segment inserted into a V-shaped forming groove provided on the outer peripheral surface of the roll core, the end of the segment has a truncated shape with an axis that coincides with the roll axis. It is attached to the outer peripheral surface of the cone.

In this case, a retaining ring is arranged as a retainer on each side of the roll coaxially with respect to the roll axis, and the surface of this retaining ring that rests against the end face of the segment is correspondingly designed conically. has been done.

The retaining rings are then fastened together by axial bolts which pass through the roll core radially inside the molding grooves that receive the segments.

Further radially inside this bolt, a retaining ring is guided in an annular groove and supported on the roll core.

Due to the moments created in the retaining ring during thermal expansion of the segments, this bolt is highly stressed in the axial direction.

The moment of the retaining ring created during thermal expansion of the segment lifts the conical crimp surface of the retaining ring away from the end face of the segment, resulting in incomplete support;
As a result, the required crimp force sufficient to hold the segments from tilting is lost.

The object of the present invention is to provide a roll press for compression kneading pots of the type mentioned at the beginning, which is capable of holding segments with a holding force corresponding to the pressing force in the cooling state even at working temperatures exceeding 1000°C. be.

The key point of the present invention that solves this problem is that a plurality of units are arranged in pairs in the roll axis direction in the outer circumferential range of the roll core so as to be pivotable about an axis arranged in the tangential direction of the roll core. A curved tightening member is arranged,
These clamping curved members are provided with protrusions that grip the protrusions provided at the ends of the segments from above, and the contact surfaces of the protrusions of the segments and the axis of rotation of the roll core form an acute angle. and a tensile pin is disposed between each pair of clamping curved members, and the tensile pin passes through the mantle composed of segments in the roll axis direction. .

Advantageously, the clamping curves are arranged in the region of the longitudinal edges of two adjacent segments, and the tensile pins are each arranged in a recess at the longitudinal edges of the segments.

In one advantageous embodiment, the segment has at its support surface a plurality of support claws which project in the circumferential direction beyond the radial projection of said longitudinal edges onto the support surface of the roll core and between them. In this case, the support pawl on one longitudinal edge has an opposing notch formed in the other longitudinal edge for receiving it, and has a tensile A recess for receiving a pin is formed in the upper end region of the support pawl.

In order to always ensure the contact force between the projection of the clamping curve and the projection of the segment during length changes, it is advantageous if the contact surface of the projection of the clamping curve and/or the projection of the segment is of medium height. is formed.

In one advantageous embodiment of the invention, the clamping arches each grip the projections of two adjacent segments from above.

In that case, the clamping curvature is advantageously fork-shaped at the end to receive the tension pin.

Particularly advantageously, the tension pin is manufactured from a material having a small coefficient of expansion compared to that of the material of the segment.

Next, the present invention will be specifically explained with reference to the illustrated embodiments.

Regarding a compression kneading roll press having two press rolls arranged horizontally next to each other, one of the press rolls being supported by a movable mechanism relative to the other press roll. explain.

FIG. 1 shows the peripheral part of a press roll, the outer circumferential surface of which supports a mantle 4, which borders each other with axis-parallel longitudinal edges and which at its ends enclose the roll core 2.
It is composed of a number of segments 6 which are releasably coupled to.

The support surface 9 of the roll core 2 and the support surface 8 of the segment 6 are formed as smooth cylindrical surfaces.

A groove 10 is provided in the center of the roll core 2.
0 may be formed as an annular groove or as a respective groove portion of each segment 6.

A key 12 is located within the groove 10, and the key 12
are fitted into corresponding grooves 14 in the bearing surface 8 of the segment 6.

This fit positions the segment 6 axially so that when the segment 6 is heated to an operating temperature of 1000 DEG C. or higher, the segment 6 expands uniformly axially from the central portion.

The outer peripheral surface of the segment 6 may be formed smoothly or may have a molded groove, and may further include a chamfered portion 54a.
may be provided.

A large number of clamping curved members 18, which can pivot about a tangential axis 16, are arranged in pairs on both end faces of the roll core 2 in the roll axis direction.

The lower end of each clamping curve 18 has a bearing ring 20 with a hole 22 through which a bearing pin 24 is inserted.
is guided through.

This bearing ring 20 of the clamping curved member 18 is connected to the round core 2.
is located within the notch 26 of.

At least one other notch 28 is formed on the outer peripheral surface of the roll core 2 at a distance from this notch 26 in the circumferential direction.
is provided, and one side surface 30 of the notch 28 is located perpendicular to the side surface 32 of the notch 26.

Through this recess 28, a hole is drilled in the roll core 2 for receiving a bearing pin 24, into which the bearing hinge 24 is inserted, and which is then fixed using known means.

The segment 6 has at both ends a projection 34 which forms an acute angle between the radially outer surface 36 and the support surface 8 or the axis of rotation of the press roll.

This acute angle is advantageously less than 20°.

At its radially outer end, the clamping arc 18 is provided with a head 38 which has a projection 40 which grips the surface 36 of the projection 34 of the segment 6 from above.

A tension pin 42 extends between the pair of clamping curved members 18, and the tension pin 42 is provided with a male thread 44 at its end, and a clamping nut 4 is attached to each of the male threads 44.
6 is fitted.

In one advantageous embodiment, this head 38 of the clamping elbow 18 is designed in the form of a fork, so that the tensile pin 42 can be inserted into the fork 48 from above.

In such a fork-shaped configuration, one thrust washer 50 is provided at each end of the tension pin 42.

As can be seen in the drawings, the tension pins 42 pass through the segment 6 at radial distances from the support surface 8 of the segment 6.

For this through-guiding of the tensile pin 42, the segment 6 can be provided with corresponding holes.

However, in a preferred embodiment, as can be seen from the drawing, the tensile pins 42 are each guided between two adjacent segments 6, the segments 6 being located at longitudinal edges 52 for receiving the tensile pins. It is provided with a notch 54.

In one advantageous embodiment, the segment 6 is provided at its support surface 8 with a number of support claws 56 which project beyond the radial projection of the longitudinal edge 52 onto the support surface 9 of the roll core 2. It has a notch 58 located between the two, and in this case,
A support pawl 56 provided on one vertical edge is opposed to a notch provided on the other vertical edge for receiving the support pawl 56 .

In such a configuration of the segment 6, the recess 54 for receiving the tensile pin 42 is advantageously provided in the upper part of the support pawl 56 or recess 58, as can be seen in particular from FIG.

Regardless of whether the tension pins 42 extend through the segments 6 or are located in the gap between two segments 6, each segment 6 is easily replaceable without having to remove the press roll from the press.

After removing the tension pin 42, the clamping arc 18 is pivoted outwardly, thereby freeing the segment 6 held by the clamping arc 18 without affecting the retention of other segments 6. Can be removed.

After mounting the new segment 6, the clamping arc 18 is pivoted over the projection 34 of the segment 6 and the tension pin 42 is then inserted.

This insertion is particularly simple if the head 38 of the clamping elbow 18 is of fork-like design, as in the embodiment shown.

In the illustrated configuration in which the tension pin 42 is placed in the gap between the two segments 6, the upper surface 36 of the projection 34 of the segment and the crimp surface of the projection 40 of the head 38 of the clamping arc 18 are respectively aligned with each other. two adjacent segments 6
In all embodiments in which it is advantageous for the clamping curvature 18 to be configured to engage with the press roll, the surface 36 may be a conical section with an axis coinciding with the axis of rotation of the press roll.

In this case, the support surface of the projection 40 of the head 38 of the clamping arc 18 is designed as a corresponding conical surface.

The support surface of the protrusion 34 may also be formed as an inclined plane.

This plane then lies parallel to the axis of pivoting 16 of the clamping arc 18.

The advantage of this design is that the supporting surface is easy to process, especially to polish.

The protrusion 34 of the segment 6 may extend circumferentially over the entire width of the segment.

However, it is sufficient that this projection 34 is provided only in the area of engagement with the clamping curved member 18.

When the segment 6 is heated to the working temperature, the segment 6 elongates, and this elongation is approximately proportional to the length l of the segment 6 as a function of the thermal expansion coefficient of the segment 6 and the temperature.

This elongation of the segment 6 is ensured by the outward pivoting of the clamping arc 18.

In order to ensure the transmission of the clamping force from the clamping arc 18 to the segment 6 at any temperature, it is advantageous to use the surface 36 of the projection 34 of the segment 6 or the underside of the projection 40 of the head 38 of the clamping arc 18. The crimping surface is formed into a convex curved surface.

In this case, the degree of curvature is formed with a relatively large radius of curvature.

Furthermore, it is also possible to design one surface concave and the other convex, so that both surfaces roll onto each other during pivoting of the clamping arc 18 during the elongation of the segment 6; ensures flat pressure transmission.

Tension pins 42 are also exposed to thermal expansion.

This thermal expansion is also proportional to the length of the longitudinal pin 42 in relation to the material's coefficient of thermal expansion and temperature.

The approximately constant tension of the tensile pin 42 and thus the segment 6
The holding force acting in the radial direction is determined by the amount of elongation of the segment 6 over the length l by using a material having a coefficient of thermal expansion significantly smaller than that of the material of the segment as the material of the tension pin 42. and the amount of extension of the tension pin over its length.

However, it is advantageous to select a material for the tensile pin 42 having a coefficient of thermal expansion that will produce a predetermined increase in crimping force at the working temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the line I-I in FIG. 2 showing the outer circumference of a breast roll according to an embodiment of the present invention, and FIG. 2 is an outer circumference of a press roll according to an embodiment of the present invention. The partial end view and FIG. 3 are cross-sectional views taken along the line ■-■ in FIG. 1. 2... roll core, 4... mantle, 6... segment, 829...
Support surface, 10... Groove, 12... Key, 14... Groove, 516... Shaft, 18... Tightening curved member, 20... Support ring, 22... Hole,
24...Support pin, 26. 28...notch, 30...side surface,
32...Side surface, 34...Protrusion, 36...Surface, 38...Head,
4o...Protrusion, 42...Tensile pin, 44...Male thread, 46...Tightening nut, 48...Fork, 5o...Thrust washer,
52... Vertical edge, 54... Notch, 54a... Chamfered portion, 56...
Support claws, l, L...length.

Claims (1)

[Scope of Claims] 1. A roll press for hot river shrinking of granular material, in which a mantle is provided on the core of the roll, and this mantle is composed of a large number of segments. The axis-parallel longitudinal edges of the segments circumferentially abut the frame, and the segments are removably connected to the roll core at their ends, and the support surface of the roll core and the segments In the type in which the support surface of the roll core 2 is formed as a smooth cylindrical surface, on the outer periphery near the edge of the roll core 2,
A large number of shafts 16 located radially inward from the outer circumferential portion and extending substantially tangentially to the outer circumferential portion are arranged in a circumferential direction on each end face side so as to form a pair, respectively, when viewed in the roll axis direction. A curved member 18 is attached to each shaft 16.
are pivotably supported, and these clamping curves 18 are provided with projections 40 which grip the projections 34 provided at the ends of the segments 6 from above, the contact surfaces 36 of the projections 34 of the segments 6 and the rotational axis of the roll core portion form an acute angle, and a notch is provided between each segment 6 or in each segment for guiding the tensile pin through the segment, and the tightening curved member 18 is similarly equipped with a notch for passing the tension pin through,
In addition, it is noted that the tensile pins 42 pass through the mantle made up of segments in the direction of the roll axis force through these notches, and are supported on the outer surface of the clamping curved member. A roll press for hot compression kneading of granular materials. 2. The tightening curved members 18 are arranged at the longitudinal edge portions of two adjacent segments 6, respectively, and partially grip each protrusion 34 of both segments 6 from above, and 2. The roll press according to claim 1, wherein a notch 54 for guiding the pin 42 through the segment is provided at the longitudinal edge of the segment 6. 3. The segment 6 has a plurality of support claws 56 on its support surface 80 that protrude in the circumferential direction beyond the radial projection plane of the longitudinal edge 52 onto the support surface 9 of the roll core portion, and a number of support claws 56 located between these. In this case, a notch formed on the other longitudinal edge is located opposite to a support claw provided on one longitudinal edge to receive the supporting claw, and 3. The roll press according to claim 2, wherein the notch 54 for receiving the tension pin 42 is formed at the upper end portion of the support claw 56. 4. The roll press according to claim 1, wherein the contact surface of the protrusion 40 of the tightening curved member 18 or the contact surface 36 of the protrusion 34 of the segment 6 is formed into a convex curved surface shape. 5. A roll press according to claim 2, wherein said clamping curvature member 18 is provided with a fork-shaped head 38 for receiving said tension pin 42. 6. A patent in which the contact surface between the protrusion 40 of the curved clamping member 18 and the protrusion 34 of the segment 6 is formed as a flat surface or a curved surface having a generatrix parallel to the axis 16 of the curved clamping member. A roll press according to claim 1. 7. The roll press according to claim 1, wherein the tension pin 42 is made of a material having a coefficient of thermal expansion smaller than that of the material of the segment 6.