JP2008128522A - Rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify maintenance work and to reduce maintenance costs with respect to an inner and outer cylinder connecting mechanism which transmits torque between an inner cylinder and an outer cylinder, in a rotary kiln having the inner cylinder and the outer cylinder as a furnace body. <P>SOLUTION: In this rotary kiln comprising a furnace main body 3 rotated and driven and heating a treated object charged from an inlet 18 while moving the same to an outlet side, and discharging the same from an outlet, the furnace main body has the rotated and driven outer cylinder 8, an inner cylinder portion disposed inside of the outer cylinder, and the inner and outer cylinder connecting mechanism 21 transmitting torque from the outer cylinder to the inner cylinder portion, and the inner and outer cylinder connecting mechanism comprises a pin retaining cylinder supported by the outer cylinder, a connection pin fitted to the pin retaining cylinder through a detachable sleeve, and a seat disposed on the inner cylinder portion for fitting a tip portion of the connection pin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary kiln used for pyrolytic gasification treatment of general waste such as municipal waste, industrial waste, etc., or when carbonized fuel is produced.

  First, an example of a rotary kiln will be described with reference to FIGS. In FIG. 2, the left is the upstream side and the right is the downstream side.

  The rotary kiln 1 is roughly constituted by an upstream furnace end casing 2, a furnace body 3, and a downstream furnace end casing 4, and the upstream furnace end casing 2 and the downstream furnace end casing 4 are fixedly supported by a furnace base 5, The furnace body 3 is rotatably supported by the furnace base 5, and seal devices 6 and 7 are provided between the upstream furnace end casing 2 and the furnace body 3, and between the furnace body 3 and the downstream furnace end casing 4. Is provided.

  The furnace body 3 will be described.

  The furnace body 3 has an outer cylinder 8 and an inner cylinder portion 9 provided inside the outer cylinder 8, and the outer cylinder 8 is rotatably supported by a rotation support mechanism 12 via a rotating body 11 such as a roller. The outer cylinder 8 is rotated by a rotary drive mechanism 13 having a drive source such as a motor.

  The inner cylinder portion 9 has a plurality of, for example, three inner cylinders 14 as shown in FIG. 3, and these inner cylinders 14 are circumferentially equidistant by support discs 15 provided at required intervals in the axial direction. It is fixedly supported by. In addition, the upstream portion of the outer cylinder 8 is a header 17 that forms a space 16 where all the inner cylinders 14 are joined. The header 17 is concentric with the outer cylinder 8. The workpiece input port 18 extends upstream. A cracked gas outlet pipe 19 is provided concentrically with the outer cylinder 8 at the lower end of the inner cylinder 14, and the cracked gas outlet pipe 19 partially communicates with the inner cylinder 14.

  Between the support disc 15 and the outer cylinder 8, an inner / outer cylinder coupling mechanism 21 is provided at a circumferentially equally divided position (for example, twelve equal parts). A support disk 15 is connected, and rotational force is transmitted from the outer cylinder 8 to the inner cylinder portion 9 via the inner / outer cylinder connection mechanism 21.

  A seal device 22 is provided between the upstream furnace end casing 2 and the workpiece input port 18, and a hot air gas outlet (not shown) is provided in the upstream furnace end casing 2.

  A seal device 23 is provided between the downstream furnace end casing 4 and the cracked gas outlet pipe 19, and a hot air gas inlet (not shown) is provided in the downstream furnace end casing 4. Further, a pyrolysis gas outlet casing 24 is provided so as to accommodate the downstream end portion of the cracked gas outlet pipe 19, and the pyrolysis gas outlet casing 24 and the inside of the cracked gas outlet pipe 19 are separated by the sealing device 23. It is separated.

  A workpiece is introduced from the workpiece inlet 18, hot gas is introduced from the downstream furnace end casing 4, hot air flows through the space between the inner cylinder 14 and the outer cylinder 8, and the upstream furnace end casing. Out of 2.

  The object to be processed is input from the object input port 18, the outer cylinder 8 and the inner cylinder 14 are integrally rotated by the rotation drive mechanism 13, and the object to be processed is being heated through the inner cylinder 14. It moves downstream and is pyrolyzed. The pyrolysis gas is discharged from the pyrolysis gas outlet casing 24 through the cracking gas outlet pipe 19, and the decomposed residue is also discharged from the pyrolysis gas outlet casing 24.

  Next, the conventional inner / outer cylinder coupling mechanism 21 will be described with reference to FIG.

  A receiving seat 26 having a fitting recess 25 is fixed to the outer periphery of the support disc 15 by a required means such as welding.

  A pin mounting hole 27 is formed concentrically with the fitting recess 25 of the outer cylinder 8, and a seat plate 28 is fixed to the outer cylinder 8 by a required means such as welding so as to close the pin mounting hole 27. The pin holding cylinder 29 is fixed by welding or the like so as to penetrate the seat plate 28. A flange 31 is fixed to the outer end of the pin holding cylinder 29, and a reinforcing rib 32 is provided between the seat plate 28 and the flange 31 in the circumferential direction.

  A connecting pin 33 is slidably fitted into the pin holding cylinder 29, and the tip of the connecting pin 33 is fitted into the fitting recess 25.

  A flange plate 34 is fixed to the flange 31 by a countersunk screw 35, and a spring receiver 37 is provided at the tip of an adjustment bolt 36 threaded through the flange plate 34, and between the spring receiver 37 and the connecting pin 33. A compression spring 38 is provided, and the compression spring 38 presses the connecting pin 33 against the fitting recess 25 with a required fitting force. A cover 39 for preventing gas leakage from the threaded portion of the adjusting bolt 36 is attached to the flange plate 34.

  Also, when a difference in thermal expansion occurs between the support disk 15 and the outer cylinder 8, the compression spring 38 is bent and the connecting pin 33 moves in the radial direction, and the difference in thermal expansion is absorbed. The fitting force is maintained.

  By rotating the outer cylinder 8, the rotational force is transmitted to the support disk 15, that is, the inner cylinder portion 9 through the connection pin 33.

  Since the outer cylinder 8 and the inner cylinder part 9 cannot be made completely concentric in manufacturing, the outer cylinder 8 and the inner cylinder part 9 are misaligned with the rotation of the furnace body 3, and the misalignment is caused. Correspondingly, the connecting pin 33 slides with respect to the pin holding cylinder 29.

  Since the connecting pin 33 slides under a large force and the rotary kiln 1 operates at a high temperature, a lubricant such as grease cannot be used. For this reason, wear is inevitable, and the connecting pin 33 must be replaced according to the wear situation.

  Conventionally, the replacement of the connecting pin 33 has been performed by removing the cover 39 and the flange plate 34, pulling out the worn connecting pin 33, and inserting a new connecting pin 33 into the pin holding cylinder 29.

  However, the wear is not limited to the connecting pin 33, and the pin holding cylinder 29 is often worn. Further, the support structure of the pin holding cylinder 29 is an isoflexible structure that locally reinforces the pin holding cylinder 29, and when the rotational force from the outer cylinder 8 acts on the connecting pin 33, the pin holding cylinder 29 29 is shaken, an excessive stress is generated in the support portion of the pin holding cylinder 29, and cracks due to fatigue may occur in the rib 32 or the seat plate 28.

  Further, when the pin holding cylinder 29 is shaken, the connecting pin 33 is inclined with respect to the seat 26, and a hole edge (edge) of the fitting recess 25 hits the connecting pin 33 so that the hole edge abuts. There was also a tendency for stress to concentrate on the part and to cause local wear.

  Therefore, the replacement is not limited to the connection pin 33 but may be the entire inner / outer cylinder connection mechanism 21, and when the inner / outer cylinder connection mechanism 21 is replaced, the seat plate 28 is cut out from the outer cylinder 8. Such work is troublesome, and the rotary kiln 1 is large, and a work scaffold must be installed.

  In addition, there exists a thing shown by patent document 1 as a rotary kiln which comprises an inner-outer cylinder connection mechanism.

Japanese Patent Laid-Open No. 9-217988

  In view of such circumstances, the present invention facilitates maintenance work on an inner / outer cylinder coupling mechanism that transmits a rotational force between an inner cylinder and an outer cylinder in a rotary kiln having an inner cylinder and an outer cylinder as a furnace body. This is intended to reduce costs.

  The present invention is a rotary kiln having a furnace body that is rotationally driven and heats an object to be processed that is input from the inlet while moving to the outlet side, and discharges it from the outlet. The furnace body is rotationally driven. An outer cylinder, an inner cylinder disposed inside the outer cylinder, and an inner / outer cylinder coupling mechanism for transmitting a rotational force from the outer cylinder to the inner cylinder, the inner / outer cylinder coupling mechanism being A pin holding cylinder supported by the cylinder, a connecting pin fitted through a sleeve detachably attached to the pin holding cylinder, and a seat provided on the inner cylinder portion to which a tip end portion of the connecting pin is fitted. This relates to the rotary kiln provided.

  Further, the present invention relates to a rotary kiln in which the outer end of the sleeve is fixed to a flange plate, the flange plate being detachable from the pin holding cylinder, and the tip of the connecting pin has a tapered shape. It relates to a rotary kiln.

  According to the present invention, in a rotary kiln having a furnace body that is rotationally driven and heats an object to be processed that is input from the inlet while moving to the outlet side, and discharges it from the outlet, the furnace body is rotationally driven. An outer cylinder, an inner cylinder part disposed inside the outer cylinder, and an inner / outer cylinder coupling mechanism for transmitting a rotational force from the outer cylinder to the inner cylinder part, A pin holding cylinder supported by the outer cylinder, a connecting pin fitted via a sleeve that can be attached to and detached from the pin holding cylinder, and a seat provided on the inner cylinder part, into which the tip of the connecting pin fits Therefore, the pin holding cylinder is prevented from being worn, and the wear is applied to the connecting pin and the sleeve. By exchanging both, the maintenance work of the inner / outer cylinder connecting mechanism is completed, and the amount of work is reduced. Can be reduced and workability can be improved.

  According to the present invention, since the outer end of the sleeve is fixed to the flange plate, and the flange plate can be attached to and detached from the pin holding cylinder, the sleeve can be attached and detached through the flange plate, thereby improving workability. To do.

  According to the present invention, since the tip end portion of the connecting pin has a tapered shape, it is possible to prevent local contact with the edge of the fitting hole of the seat even when the connecting pin is inclined. In addition, stress concentration can be avoided and local wear can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an inner / outer cylinder coupling mechanism 21 implemented in a rotary kiln according to the present invention. The configuration of the rotary kiln main body is the same as that shown in FIG. In FIG. 1, the same components as those shown in FIG. 4 are denoted by the same reference numerals.

  The inner / outer cylinder coupling mechanism 21 is provided at a position that is divided into the outer cylinder 8 at a required equal interval, for example, a circumference 12.

  The pin holding cylinder 29 is supported by the reinforcing rib 41 so as to penetrate the center of the pin mounting hole 27. The reinforcing rib 41 is fixed to the outer cylinder 8 by a necessary means such as welding, and is provided between the pin holding cylinders 29 provided at a required interval, and is preferably continuous over the entire circumference.

  The shape of the reinforcing rib 41 is, for example, an I-shaped cross section in which the flanges 43, 43 are fixed to the upper and lower portions of the web member 42, and since it is continuous over the entire circumference, the rigidity is high.

  The pin holding cylinder 29 has a flange 31 fixed to the outer end, and a sleeve 44 is fitted into the pin holding cylinder 29. A flange plate 34 is fixed to the outer end of the sleeve 44 by welding or the like, and the sleeve 44 and the flange plate 34 are integrated. The flange plate 34 is detachably fixed to the flange 31 by a countersunk screw 35. It has become like that. The flange 43 of the reinforcing rib 41 may function as the flange 31 and the flange plate 34 may be detachably attached to the flange 43.

  An adjustment bolt 36 is threaded through the flange plate 34, and a spring receiver 37 is rotatably provided at the tip of the adjustment bolt 36. A compression spring 38 is provided between the spring receiver 37 and the connecting pin 33, The connecting pin 33 and the receiving seat 26 are fitted with a required pressing force by the compression spring 38. A cover 39 is detachably attached to the flange plate 34 with bolts 45.

  The fitting portion of the connecting pin 33 with the fitting recess 25 has a tapered shape that tapers toward the tip, for example, a tapered shape with an inclination of 1.5 °, and the tip surface has a convex curved surface or a convex cone. The surface and the like have a raised center part.

  A receiving sleeve 46 is fitted in the fitting recess 25 of the receiving seat 26, and the connecting pin 33 is fitted into the fitting recess 25 via the receiving sleeve 46. The receiving sleeve 46 is preferably removable.

  Hereinafter, the operation of the inner / outer cylinder coupling mechanism 21 will be described.

  Transmission of power from the outer cylinder 8 to the support disk 15, i.e., the inner cylinder portion 9, passes through the pin holding cylinder 29, the sleeve 44, the connecting pin 33, and the receiving sleeve 46, It is transmitted to the inner cylinder part 9.

  The eccentricity or thermal expansion difference between the outer cylinder 8 and the inner cylinder portion 9 is absorbed while the compression spring 38 is bent and the connecting pin 33 is displaced in the radial direction to maintain a predetermined fitting force. The

  Next, replacement of the connecting pin 33 will be described.

  The bolt 45 is removed and the cover 39 is removed. The countersunk screw 35 is removed, and the adjustment bolt 36 is pulled out in the radial direction (upward in FIG. 1). The adjusting bolt 36 and the flange plate 34 are screwed together, and the flange plate 34 and the sleeve 44 are integrated, so that the sleeve 44 is pulled out. At this time, if the frictional force between the connecting pin 33 and the sleeve 44 is large, the connecting pin 33 is detached from the fitting recess 25, and the connecting pin 33 is pulled out together with the sleeve 44. If the connecting pin 33 remains, the connecting pin 33 may be pulled out separately as in the prior art.

  In the present embodiment, the sleeve 44 that may be worn can also be replaced, and since the sleeve 44 is interposed between the connecting pin 33 and the pin holding cylinder 29, the pin holding cylinder 29 itself is worn. There is no need for replacement. Therefore, the replacement of the connecting pin 33 is very simple and can be performed in a short time.

  When fitting a new connecting pin 33, the sleeve 39 previously fitted with the connecting pin 33 is inserted into the pin holding cylinder 29 and fixed to the flange 31, and then the cover 39 is attached.

  In the present embodiment, the support of the pin holding cylinder 29 is reinforced by the reinforcing rib 41 having high rigidity. Accordingly, the pin holding cylinder 29 has a rigid structure, the pin holding cylinder 29 is not shaken, and the reinforcing rib 41 has high strength. Generation of cracks and the like can be avoided.

  In addition, the connecting pin 33 may be inclined with respect to the fitting recess 25 due to factors such as gaps between components. On the other hand, since the connecting pin 33 has a tapered shape, even if the connecting pin 33 is inclined, the contact pin 33 is brought into a surface contact state or a state close to a surface contact, and stress concentration occurs at the hole edge of the fitting recess 25. Avoided and local wear is prevented.

  Moreover, since the front end surface of the connecting pin 33 is convex, the connecting pin 33 is inclined without difficulty.

It is sectional drawing which shows the principal part of embodiment of this invention. It is sectional drawing which shows the outline of a rotary kiln. It is an AA arrow line view of FIG. It is sectional drawing of the conventional inner and outer cylinder connection mechanism used for a rotary kiln.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary kiln 2 Upstream side furnace end casing 3 Furnace main body 4 Downstream side furnace end casing 8 Outer cylinder 9 Inner cylinder part 13 Rotation drive mechanism 14 Inner cylinder 15 Support disk 18 Workpiece inlet 24 Pyrolysis gas outlet casing 25 Fitting recess 26 Receiving seat 29 Pin holding cylinder 31 Flange 33 Connecting pin 34 Flange plate

Claims (3)

  In a rotary kiln equipped with a furnace body that is rotationally driven and heated while moving the workpiece input from the inlet to the outlet side and discharges it from the outlet, the furnace body includes an outer cylinder that is rotationally driven, An inner cylinder part disposed inside the outer cylinder; and an inner / outer cylinder coupling mechanism that transmits a rotational force from the outer cylinder to the inner cylinder part, and the inner / outer cylinder coupling mechanism is supported by the outer cylinder. A pin holding cylinder, a connecting pin fitted to the pin holding cylinder via a detachable sleeve, and a receiving seat provided on the inner cylinder part to which the tip end of the connecting pin is fitted. A featured rotary kiln.   The rotary kiln according to claim 1, wherein an outer end of the sleeve is fixed to a flange plate, and the flange plate is detachable from the pin holding cylinder.   The rotary kiln according to claim 1, wherein a distal end portion of the connecting pin has a tapered shape.

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