JP2022179995A - rotary kiln - Google Patents

Abstract

To provide a rotary kiln provided with easily exchangeable tire chokes on tire underlay plates provided at the outer circumferential face of a kiln body to regulate the movement of a tire in an axial direction.SOLUTION: In a rotary kiln 10 rotatively supporting a tire 11 externally fitted with gaps from the upper faces of a plurality of tire underlay plates 13 provided at prescribed intervals in the circumferential direction of a cylindrical kiln body 14 by a roller 16, each tire underlay plate 13 is a long-sized member with the axial direction of the kiln body 14 as a longitudinal direction and extends so as to be longer than the width of the tire 11, and a pair of tire chokes 12 provided on the tire underlay plates 13 so as to sandwich from both the end faces of the tire 11 are each composed of: a contact part 12a contacted with the tire 11; and a stationary part 12b fastened onto each tire underlay plate 13, and the contact part 12a is provided detachably from the stationary part 12b.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln used for calcining raw materials and incinerating waste in the production of cement, lime, ore, and the like, and in the treatment of waste.

A rotary kiln is one of the horizontal rotary furnaces. Annular tires are fitted on the outer periphery of a cylindrical kiln body at predetermined intervals along the axial direction, and a pair of rollers are provided under each tire. is rotatably supported by In addition, in the gap between the kiln body and the tire, a tire underlay plate is fixed on the outer circumference of the kiln body to protect the kiln body.

The kiln body is arranged at an angle so that the inlet on the supply side is at a high position and the outlet on the discharge side is at a low position. It is a structure in which the processed material is discharged from the exit.
Since the kiln body is inclined in this way, a pair of tire stoppers are welded onto the tire underlay plate so as to sandwich both end surfaces of each tire, thereby restricting the tire from moving in the axial direction. there is

Tire stoppers are always subjected to axial force of the kiln body, and friction occurs on the sliding surface between the tire and the tire stopper, and wear progresses, so the tire stoppers must be replaced periodically. However, the replacement work requires cutting and removing the welded portion of the tire stopper welded to the tire underlay plate, which requires large-scale heavy machinery and scaffolding, which is time-consuming.

In order to prevent wear due to slippage between the tire and the liner under the tire, Patent Document 1 proposes to form a recessed groove in the inner peripheral portion of the tire so that a key fixed on the liner under the tire and a groove with this key are formed. The wedge inserted between the side surfaces is an integral structure, thereby restricting in the circumferential direction. In addition, the axial direction of the tire is regulated by contacting both side peripheral surfaces of the tire by guide pieces screwed onto the liner guide, which serves to maintain the position of the tire lower liner.
In this way, in a rotary kiln, by adopting a structure in which sliding friction does not occur between the tire, the liner under the tire, and the guide piece fixed on the liner guide, it is possible to extend the service life of those members. Proposed.

JP-A-2002-327985

However, in Patent Document 1, since the guide piece (corresponding to the tire stopper of the present invention) is fixed on the liner guide by tightening the bolt from above, the axial direction of the kiln body during operation of the rotary kiln is fixed. The force acts in a direction orthogonal to the force with which the bolt presses the guide piece from above, and may damage the bolt. Here, the axial direction of the bolt is referred to as the up-down direction, and the side of the bolt head is referred to as the up direction.
In addition, long term operation can wear the guide piece causing the tire to move axially. In such cases, it can be repaired by replacing the guidepiece, but the replacement cost, including the cost of the new guidepiece, is high. Also, as the number of exchanges increases, the cost increases.

In view of the above points, the present invention provides an easily replaceable tire that is easily replaceable and worn due to wear on a tire underplate provided on the outer peripheral surface of the kiln body for restricting the axial movement of the tire. To provide a rotary kiln provided with tire stoppers capable of adjusting a gap between them.

As a first means for solving the above-mentioned problems, the present invention provides a tire that is fitted on a cylindrical kiln body with a gap from the upper surface of a plurality of tire underlay plates that are provided at predetermined intervals in the circumferential direction. In a rotary kiln rotatably supported by
The tire underlay plate is an elongated member whose longitudinal direction is the axial direction of the kiln body, and extends longer than the width of the tire,
A pair of tire stoppers provided on the tire underlay plate so as to sandwich from both end surfaces of the tire has a contact portion that contacts the tire, a fixing portion fixed on the tire underlay plate,
and the contact portion is detachably provided from the fixed portion.
According to the first means, since the tire stopper can be divided into the contact portion and the fixed portion, the contact portion worn by the rotation of the tire can be removed and replaced. At that time, the contact area between the tire and the tire stopper can be adjusted by changing the height and width of the newly attached contact portion. For example, by making the height of the contact portion higher than before, the contact area with the tire end face can be increased, so the force applied to the tire stop can be dispersed and the load can be reduced.

As a second means for solving the above problems, the present invention provides the rotary kiln according to the first means, wherein the contact portion is detachably secured to the fixed portion by a bolt. will do.
According to the second means, the contact portion can be easily replaced by removing the bolt from the tire stop worn by the rotation of the tire. At that time, the contact area between the tire and the tire stopper can be adjusted by changing the height and width of the newly attached contact portion.

According to the present invention, as a third means for solving the above problems, a lubricant is embedded in the contact portion of the tire stop,
A rotary kiln according to the first or second means is provided, characterized in that the surfaces of the contact portions of the tire stoppers that come into contact with both end surfaces of the tire are lubricated by the lubricant.
According to the third means, the surface of the contact portion of the tire stop that slides in contact with both end surfaces of the tire is lubricated, thereby reducing the wear resistance of the contact portion of the tire stop due to friction and extending the life. can be extended.

As a fourth means for solving the above-mentioned problems, the present invention removes the gap between the tire stop and both end surfaces of the tire by:
The rotary kiln according to any one of the first to third means is provided, wherein adjustment is made by a spacer provided between the contact portion of the tire stop and the fixed portion of the tire stop.
According to the fourth means, the gap between the tire stopper and both end surfaces of the tire caused by the wear of the tire stopper due to the rotation of the tire is provided between the contact portion of the tire stopper and the fixing portion of the tire stopper. The contact portion of the tire stopper is pressed against both end surfaces of the tire by the spacer for adjustment.

ADVANTAGE OF THE INVENTION According to this invention, the contact part of a tire stop which slides and wears with the both end surfaces of a tire can be easily replaced|exchanged, and wear can be reduced by the lubricant of the contact part of a tire stop. Furthermore, it is also possible to easily adjust the gap between the worn tire chock and the tire.

BRIEF DESCRIPTION OF THE DRAWINGS The explanatory drawing of the rotary kiln of this invention is shown, (a) is a schematic side view, (b) is a schematic arrow directional view from an X direction. 1 shows an explanatory diagram of the rotary kiln of the present invention, (a) is a partial structural diagram, (b) is a plan view showing the tire mounting portion expanded in the circumferential direction, and (c) is the AA line of (a). (d) is a cross-sectional view taken along the line BB of (a). Shows an explanatory diagram of a conventional rotary kiln, (a) is a partial structural diagram, (b) is a plan view showing the tire mounting part expanded in the circumferential direction, (c) is an AA arrow in (a) FIG. 4D is a cross-sectional view taken along the line BB in FIG. 4A.

Embodiments of the present invention will be described in detail with reference to the drawings.
Hereinafter, after explaining the structure of a conventional rotary kiln with reference to FIG. 3 attached herewith, the structure of the rotary kiln of the present invention will be described with reference to FIGS.

[Conventional rotary kiln]
FIG. 3 is a diagram illustrating a conventional rotary kiln, (a) is a partial structural diagram, (b) is a plan view showing the tire mounting portion expanded in the circumferential direction, and (c) is A in (a). -A is a cross-sectional view, and (d) is a BB cross-sectional view of (a).
As shown in FIG. 3, in the conventional rotary kiln, both end surfaces of tires 1 provided at predetermined intervals in the axial direction of a cylindrical kiln body 4 are sandwiched between tire stoppers 2, and the kiln body 4 is axially moved. movement is regulated and held in place. Further, as shown in (a) and (b), the length of the tire underlay plate 3 in the longitudinal direction is longer than the width of the tire 1, and the tire base plate 3 is projected and exposed in the axial direction of the kiln body 4, and (c). , (d), the tire stoppers 2 are fixed on the tire underlay plate 3 provided on the outer circumference of the kiln body 4 at predetermined intervals in the circumferential direction.
The tire underlay plate 3 can be fixed by welding or by providing guides between the tire underlay plates 3 in the circumferential direction of the kiln body 4 . In FIG. 3, a tire underlay plate 3 is provided on a kiln body 4 by welding, and a tire stop 2 is fixed on the tire underlay plate 3 by welding. Further, in some cases, the tire stopper 2 and the tire underlay plate 3 are pressed from above by a pressing metal (not shown) and welded and fixed to the kiln body 4 .

As the tire 1 rotates, the tire stopper 2 always receives force from the axial direction of the kiln body 4, and friction occurs on the sliding surface between the tire 1 and the tire stopper 2, and wear progresses. must be replaced periodically.
However, since many welds are provided as described above, when replacing the tire stopper 2, it is necessary to update the complete set, and for the replacement work, large-scale heavy machinery and scaffolding are prepared and the welds are cut. It has to be removed by removing it, and it takes a lot of time and effort.

[Rotary kiln of the present invention]
FIG. 1(a) shows a schematic side view of a rotary kiln 10 of the present invention, in which tires 11 are fitted on a kiln body 14 with a predetermined space in the axial direction. In the rotary kiln 10, the kiln body 14 is arranged with the axis inclined so that the inlet on the supply side is high and the outlet on the discharge side is low. Left shoulder is down. The kiln body 14 is rotated by a driving device 19 and supported by rollers 16 rotatably supported by roller bearings 17 . At this time, one tire 11 is supported by a pair of rollers 16 .
As shown in FIGS. 1 and 2, both end surfaces of tires 11 provided at predetermined intervals in the axial direction of a cylindrical kiln body 14 are sandwiched between tire stoppers 12 to prevent movement of the kiln body 14 in the axial direction. Regulated and held in place.
In FIG. 2, (a) is a partial structural diagram, (b) is a plan view showing the tire mounting portion expanded in the circumferential direction, (c) is a cross-sectional view taken along line AA of (a), (d) ) shows a cross-sectional view taken along line BB in (a). Further, as shown in (a) and (b), the length of the tire underlay plate 13 in the longitudinal direction is longer than the width of the tire 11, and is exposed in the axial direction of the kiln body 14, and (c). , (d), the tire stoppers 12 are fixed to the tire underlay plate 13 provided on the outer circumference of the kiln body 14 at predetermined intervals in the circumferential direction.
In the present invention as well, the tire underlay plate 13 may be fixed by either a method of fixing by welding or a method of fixing by providing guides between the tire underlay plates 13 in the circumferential direction of the kiln body 14. In the embodiment shown in FIGS. 1 and 2, the tire underlay plate 13 is welded to the outer circumference of the kiln body 14 . Also, although the tire stoppers 12 in FIGS. 1(a) and 1(b) are displayed with different numbers of installations, the number of installations would be the same if they were to be displayed accurately.
At this time, preferably, the tire stoppers 12 and the tire underlay plates 13 are provided on the kiln body 14 at equal intervals in the circumferential direction, and the number of the tire stoppers 12 and the tire underlay plates 13 to be installed is matched to the size of the diameter of the kiln. can be adjusted to the optimum number.

The tire stopper 12 can be divided into a contact portion 12a and a fixed portion 12b, and the contact portion 12a is detachably secured to the fixed portion 12b by a bolt 15. In other words, the contact portion 12a is not fixed on the tire underlay plate 13 by welding, but is detachable from the fixing portion 12b fixed on the tire underlay plate 13 by welding.
Therefore, friction occurs between the sliding surfaces of the tire 11 and the tire stopper 12, and the contact portion 12a of the worn tire stopper 12 can be freely replaced by removing the bolt 15. FIG.
Thus, in the replacement work of the tire stopper 12 according to the present invention, there is no need to prepare large-scale heavy machinery or scaffolding, and it is not time-consuming.
Further, as shown in FIG. 2B, the contact portion 12a has a U-shaped structure in which the concave portion of the contact portion 12a faces the side that does not contact the tire 11 (the side opposite to the tire 11). By supporting the portion 12b with the concave portion, the load on the bolt 15 is reduced, making the bolt 15 less likely to break.

Furthermore, when replacing the contact portion 12a of the tire stopper 12, it is also possible to check the degree of wear of the tire 11 and adjust the shape of the newly attached contact portion 12a. That is, the contact area between the tire 11 and the tire stopper 12 can be adjusted by changing the height and width of the newly attached contact portion 12a. Here, the height of the contact portion 12a indicates the vertical length from the upper surface of the tire underlay plate 13 in FIG. 2(a), and the width of the contact portion 12a extends in the circumferential direction in FIG. 2(b). It shows the length of the tire 11 in the longitudinal direction.
For example, if the height of the contact portion 12a is made higher than before, the contact area with the end surface of the tire 11 can be increased, so that the force applied to the tire stop 12 can be dispersed and the load can be reduced.

FIG. 2D is a diagram of the tire stopper 12 viewed from the tire 11 side, and shows the surface of the contact portion 12a of the tire stopper 12 that contacts the end face of the tire 11. FIG. A plurality of circular shapes in the contact portion 12a of the tire stopper 12 in FIG. 2(d) represent the lubricant 18, and since the lubricant 18 is embedded in one surface of the contact portion 12a, the tire stopper 12 and the contact portion 12a The sliding surface of is lubricated.
Therefore, the friction can be reduced by the lubricant 18, the wear of the tire stop 12 can be suppressed, and the replacement frequency of the contact portion 12a can be reduced. This lubricant 18 can be renewed in accordance with the timing of replacement of the contact portion 12a.
At this time, the lubricant 18 may be liquid, semi-liquid (semi-solid), or solid. Under the condition that the rotary kiln is installed outdoors, rain or heat applied to the rotary kiln may cause the lubricant 18 to Solid lubricants that are least likely to flow out are preferable. Furthermore, under high-temperature conditions, among solid lubricants, graphite is suitable because it can withstand use at relatively high temperatures.

[effect]
Next, the effects of the rotary kiln 10 of the present invention will be described. This effect can be distinguished from the fact that the tire stopper 12 can be divided and the contact portion 12a can be attached and detached, and the fact that the lubricant 18 is embedded in the contact portion 12a.

[Effect of Detachable Contact Portion 12a]
Since the contact portion 12a is not fixed by welding but is fixed to the fixed portion 12b welded onto the tire underlay plate 13 by the bolt 15, the contact portion 12a can be freely attached and detached. Thereby, the following effects can be obtained.
As described with reference to FIGS. 1 and 2, according to the rotary kiln 10 of the present invention, even when the tire stop 12 wears and needs to be replaced, the contact portion 12a can be easily removed and replaced. can be done.
In addition, it is possible to change the height and width of the contact portion 12a to be newly attached and to freely adjust the gap between the tire 11 and the contact portion 12a by observing the degree of wear of the tire 11. FIG.

The gap between the tire 11 and the contact portion 12a is, as shown in FIG. adjusted by pressing against In other words, this gap can be easily adjusted by changing the thickness and number of spacers.

As described above, according to the present invention, replacement work can be easily performed, and the shape of the contact portion 12a can be freely adjusted. Downtime can also be shortened. Therefore, it is possible to minimize the influence of the change work time (shutdown time) on the total throughput processed by the rotary kiln.

Furthermore, since the replacement work can be performed without requiring large-scale heavy machinery and scaffolding, compared to conventional methods, installation costs for heavy machinery and scaffolding are almost negligible, and tire stoppers 12 that need to be replaced due to wear can be replaced. On the other hand, since it can be adjusted by providing a spacer, it can be adjusted without replacement, so the cost of replacement parts can be reduced. In addition, even if replacement is required, only the contact portion 12a of the tire stop 12 can be replaced, so the replacement member cost can be reduced compared to the conventional replacement.

[Effect of Lubricant 18]
In the rotary kiln 10 of the present invention, as shown in FIG. 2(d), the lubricant 18 is embedded in the contact portion 12a of the tire stop 12 that contacts the end surface of the tire 11. As shown in FIG. As a result, the surface of the contact portion 12a is lubricated, and the sliding surface between the tire stop 12 and the contact portion 12a is lubricated.
Therefore, the lubricant 18 can reduce the friction of the sliding surface between the tire stopper 12 and the contact portion 12a, and the wear of the tire stopper 12 can be suppressed, so that the life of the contact portion 12a can be extended and the replacement frequency can be reduced. be possible.

In this way, since the number of times of replacement work can be reduced, the operation stop time of the rotary kiln due to replacement work can also be shortened. Therefore, it is possible to minimize the influence of the change work time (shutdown time) on the total throughput processed by the rotary kiln. In addition, compared to the case where the lubricant 18 is not used, the replacement member cost for the contact portion 12a can be reduced.

The present invention is applicable not only to rotary kilns but also to all horizontal rotary furnaces including kilns other than rotary kilns, dryers, and coolers.

In addition to the above, the configurations described in the above embodiments can be selected or changed as appropriate without departing from the gist of the present invention.
For example, the lubricant 18 is embedded in the contact portion 12a that can be separated from the tire stopper 12, but it is also embedded in the conventional indivisible tire stopper 2 so that the surface that contacts the end surface of the tire 1 is lubricated. You can

1, 11 Tires 2, 12 Tire stoppers 3, 13 Tire underlays 4, 14 Kiln body 10 Rotary kiln 12a of the present invention Contact part 12b Fixing part 15 Bolt 16 Roller 17 Roller bearing 18 Lubricant 19 Driving device

Claims (4)

In a rotary kiln in which a tire is rotatably supported by a roller, the tire is fitted with a gap from the upper surface of a plurality of tire underlay plates provided on a cylindrical kiln body with a predetermined interval in the circumferential direction,
The tire underlay plate is an elongated member whose longitudinal direction is the axial direction of the kiln body, and extends longer than the width of the tire,
A pair of tire stoppers provided on the tire underlay plate so as to sandwich from both end surfaces of the tire has a contact portion that contacts the tire, a fixing portion fixed on the tire underlay plate,
and the contact portion is detachably provided from the fixed portion.
2. The rotary kiln according to claim 1, wherein the contact portion is detachably secured to the fixed portion by a bolt.
Lubricant is embedded in the contact part of the tire stop,
3. The rotary kiln according to claim 1, wherein the surfaces of the contact portions of the tire stoppers that come into contact with both end surfaces of the tire are lubricated by the lubricant.
The gap between the tire stop and both end faces of the tire
The rotary kiln according to any one of claims 1 to 3, wherein adjustment is made by a spacer provided between the contact portion of the tire stop and the fixed portion of the tire stop.

Images