JP4339229B2 - Rotary kiln - Google Patents

Description

  The present invention has a double-cylinder structure having an outer cylinder and an inner cylinder, and an inner passage through which the workpiece is passed inside the inner cylinder is a separate outer passage through which the workpiece is passed outside the inner cylinder and inside the outer cylinder. It relates to a rotary kiln with a passage.

  The rotary kiln that heats the workpiece supplied into the rotating cylinder and performs processing such as combustion, dry distillation, and drying has a double-cylinder structure having an outer cylinder and an inner cylinder. An internal passage through which an object passes is provided outside the inner cylinder and another outer passage through which the object to be processed passes inside the outer cylinder, and a separate object to be processed is supplied to each passage (for example, a patent) Document 1) and an object in which an object to be processed in the inner passage is supplied to the outer passage in the opposite direction (for example, see Patent Document 2). These double-cylinder rotary kilns have advantages such as a compact design that can increase the length of the processing path of the workpiece, and that heat generated in one processing path can be used as a heat source for the other processing path.

  The inner and outer passages of the double-cylinder rotary kiln are provided with spiral stirring blades in order to transport the workpiece while stirring efficiently, as in the processing passage of the single-cylinder rotary kiln. Or a plurality of scraping plates (partition plates) extending in the axial direction for scraping up the object to be processed (see, for example, Patent Document 1). Note that the spiral stirring blade for the outer passage provided on the outer diameter surface of the inner cylinder and the scraping plate extending in the axial direction have a gap between the tip and the outer diameter of the outer cylinder in anticipation of thermal expansion. Designed to open.

  In addition, the outer cylinder and the inner cylinder of the rotary kiln having the double cylinder structure, as described in Patent Document 2, often rotate the outer cylinder and the inner cylinder independently, but are described in Patent Document 1. In this case, a protrusion is provided on the inner side of the outer cylinder, and the front end of the partition plate provided on the outer diameter surface of the inner cylinder is engaged with the protrusion so that the inner cylinder rotates together with the outer cylinder. It has been proposed to simplify the entire drive system by omitting the cylinder drive source.

JP 2001-11467 A JP 2004-3826 A

  In the rotary kiln having the double cylinder structure described above, the object to be processed adheres to and accumulates on the inner surface of the outer cylinder, and the smooth transfer of the object to be processed in the outer passage and the smooth rotation of the outer cylinder and the inner cylinder are obstructed. May be. In the device described in Patent Document 2, the inner cylinder is driven to rotate independently, so that the object to be treated attached to the inner diameter surface of the outer cylinder is scraped with a spiral stirring blade provided on the outer diameter surface. However, there is a problem that a drive system for independently rotating the outer cylinder and the inner cylinder is complicated.

  On the other hand, the one that rotates the inner cylinder proposed in Patent Document 1 together with the outer cylinder can simplify the drive system, but the inner cylinder rotates together with the outer cylinder. The partition plate cannot scrape off the object to be processed which adheres to the inner diameter surface of the outer cylinder.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary kiln having a double cylinder structure that can scrape off an object to be processed that adheres to the inner diameter surface of an outer cylinder and has a simple drive system.

  In order to solve the above-mentioned problems, the present invention has a double cylinder structure having an outer cylinder and an inner cylinder, and an inner passage through which an object is passed inside the inner cylinder is formed outside the inner cylinder and inside the outer cylinder. In the rotary kiln provided with another outer passage for passing the workpiece, on the outer diameter surface of the inner cylinder, radially provided with a plurality of scraping plates extending in the axial direction to scrape the workpiece in the outer passage, A configuration was adopted in which the inner cylinder provided with these scraping plates was placed inside the outer cylinder so as to be able to roll.

  That is, on the outer diameter surface of the inner cylinder, a plurality of scraping plates extending in the axial direction for scraping up the workpiece in the outer passage are provided radially, and the inner cylinder provided with these scraping plates is arranged on the inner side of the outer cylinder. The inner cylinder drive source can be omitted to simplify the drive system, and the outer ends of a plurality of scooping plates provided radially on the outer diameter surface of the inner cylinder can be The workpiece to be adhered to the inner surface of the cylinder can be scraped off.

  By providing a ring for connecting the tip ends of the plurality of scooping plates in an annular shape at least at one axial position, the inner cylinder is grounded to the inner diameter surface of the outer cylinder by this ring and rolled, thereby providing an outer passage. By narrowing the gap between the tip of the scraping plate on the side to be scraped and the inner diameter surface of the outer cylinder, the amount of workpieces falling from the scraping plate is reduced, and the workpiece is efficiently stirred. Can be processed.

  As shown in FIG. 2, which is the first embodiment of the present invention, when a ring 14 is provided for connecting the tip portions of the plurality of scraping plates 13 in an annular shape, the ring rolls in the direction of the arrow inside the outer cylinder 1. The inner cylinder 2 is grounded via the ring 14 at a position Q slightly deviated to the rolling front side from the lowest position P of the inner diameter surface of the outer cylinder 1. Therefore, the clearance between the tip of the scraping plate 13 on the side of the workpiece to be scraped up in the outer passage 5 and the inner diameter surface of the outer cylinder 1 is always kept narrow, and the fall of the workpiece from the scraping plate 13 is suppressed. Is done.

  On the other hand, when the ring is not provided, as shown in FIG. 7, the inner cylinder 2 provided with a plurality of scooping plates 13 radially moves downward when rolling in the direction of the arrow inside the outer cylinder 1. The tip ends of the two scooping plates 13 positioned on the ground are in contact with the inner diameter surface of the outer cylinder 1. Depending on the grounding position of the lowermost scooping plate 13, as shown in FIG. There is a case where the side scraping plate 13 is grounded and a case where the rolling rear side scraping plate 13 is grounded as shown in FIG. 7B. In the state shown in FIG. 7 (a), the gap between the tip of the scraping plate 13 on the rolling front side, that is, the side for scraping up the workpiece in the outer passage 5, and the inner diameter surface of the outer cylinder 1 is narrowed. In the state shown in FIG. 7B, the gap is widened and the workpiece is dropped.

  Means for restricting the axial center position of the inner cylinder that rolls inside the outer cylinder is provided, and the tip of the scraping plate on the side that scrapes up the workpiece in the outer passage and the inner diameter surface of the outer cylinder By restricting the gap to be narrowed, the objects to be processed falling from the scraping plate can be reduced, and the objects to be processed can be efficiently stirred and processed.

  In the rotary kiln of the present invention, a plurality of scraping plates extending in the axial direction for scraping up an object to be processed in the outer passage are provided radially on the outer diameter surface of the inner cylinder forming the double cylinder structure. Since the inner cylinder provided with the plate is mounted on the inner side of the outer cylinder so as to be able to roll, it is possible to simplify the drive system by omitting the driving source of the inner cylinder, and radially to the outer diameter surface of the inner cylinder. The tip of the plurality of scraping plates provided can scrape off the workpieces that adhere to the inner diameter surface of the outer cylinder, prevent the deposits from accumulating, and smooth the workpieces in the outer passage. Transfer and smooth rotation of the outer cylinder and the inner cylinder can be ensured.

  By providing a ring for connecting the tip ends of the plurality of scooping plates in an annular shape at least at one axial position, the inner cylinder is grounded to the inner diameter surface of the outer cylinder by this ring and rolled, thereby providing an outer passage. By narrowing the gap between the tip of the scraping plate on the side to be scraped and the inner diameter surface of the outer cylinder, the amount of workpieces falling from the scraping plate is reduced, and the workpiece is efficiently stirred. Can be processed.

  A means for regulating the axial center position of the inner cylinder that rolls inside the outer cylinder is provided, and the gap between the tip of the scraping plate on the side that scrapes up the workpiece in the outer passage and the inner diameter surface of the outer cylinder is narrowed. Also by regulating so as to reduce the number of objects to be processed falling from the scraping plate, the objects to be processed can be efficiently stirred and processed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. As shown in FIGS. 1A, 1B and 2, this rotary kiln has a double cylinder structure having an outer cylinder 1 and an inner cylinder 2, and is supplied from a feeder 3 provided in the hood chamber 6. The workpiece to be processed is supplied from one end side to the inner passage 4 inside the inner cylinder 2 and transferred to the other end side. And it falls to the outer channel | path 5 between the inner cylinder 2 and the outer cylinder 1, and is transferred to the reverse direction to the inner channel | path 4, falls in the food | hood chamber 6, and is discharged | emitted.

  The outer cylinder 1 is supported by a pair of rotation support rollers 8 via tires 7 attached to both ends, and is driven to rotate by a driving means (not shown). An outer heat furnace 9 is provided on the outer periphery of the outer cylinder 1, and an exhaust cylinder 10 is inserted on the side where the outer passage 5 is connected to the inner passage 4, so that the inner passage 4 and the outer passage 5 are transferred. The object to be treated is heated by the external heating furnace 9, and the exhaust gas generated by this heating is discharged from the exhaust tube 10. A stopper 11 that restricts the axial movement of the rolling inner cylinder 2 is provided between the inner upper and lower parts near both ends of the outer cylinder 1.

  A spiral stirring blade 12 is provided on the inner diameter surface of the inner cylinder 2 for transferring the object to be processed in the inner passage 4 while stirring. Also, on the outer diameter surface of the inner cylinder 2, as shown in FIG. 3, six scraping plates 13 extending in the axial direction for scraping and stirring the workpiece in the outer passage 5 are radially provided. Rings 14 that are provided and connect the tip portions in an annular shape are provided at three locations, both axial end portions and a central portion. Each ring 14 is formed by a circular arc member 14 a that connects the tip portions of adjacent scraping plates 13. The ring 14 may be provided in at least one place in the axial direction, and the ones at both ends or the center may be omitted.

  The inner cylinder 2 rolls in the same direction as the rotationally driven outer cylinder 1 as indicated by an arrow in FIG. 2, but at this time, the lowest position of the inner diameter surface of the outer cylinder 1 via the ring 14. Grounding is performed at a position Q slightly deviated from P toward the rolling front side. Therefore, the clearance between the tip of the scraping plate 13 on the side of the workpiece to be scraped up in the outer passage 5 and the inner diameter surface of the outer cylinder 1 is always kept narrow, and the fall of the workpiece from the scraping plate 13 is suppressed. Is done.

  FIG. 4 shows a modification of the ring 14. In this modification, the circular arc member 14 a forming the ring 14 has a flat shape at the connection portion with the scraping plate 13, and the tip end portion of the scraping plate 13 slightly protrudes outside the ring 14. In this modification, when the scraping plate 13 comes close to the position Q shown in FIG. 2, the inner cylinder 2 is temporarily grounded via the scraping plate 13, but immediately grounded via the ring 14. As in the case of the first embodiment, the clearance between the tip of the scraping plate 13 on the side to scrape the workpiece and the inner diameter surface of the outer cylinder 1 is kept narrow. The fall of the object to be processed from is suppressed.

  5 and 6 (a) and 6 (b) show a second embodiment. The rotary kiln has the same basic configuration as that of the first embodiment, and instead of providing the ring 14 for connecting the tip of the scraping plate 13 of the inner cylinder 2, both ends of the inner cylinder 2 are provided. Pressure rollers 15a and 15b for pressing the rolling front side are provided, and the axial position of the inner cylinder 2 that rolls inside the outer cylinder 1 is set up on the side of the scraping plate 13 that scrapes up the workpiece in the outer passage 5. Only the point which restricted so that the clearance gap between the front-end | tip and the internal diameter surface of the outer cylinder 1 may be narrowed differs. Therefore, also in this embodiment, the fall of the workpiece from the scraping plate 13 is prevented, and the workpiece is efficiently stirred. The supply roller 3 side pressing roller 15 a is attached to the hood chamber 6 to press the outer diameter surface of the inner cylinder 2, and the opposite side pressing roller 15 b is attached to the exhaust cylinder 10 to connect the inner cylinder 2 inside diameter. The surface is pressed. You may make it these press rollers 15a and 15b press the outer-diameter surface or internal-diameter surface of the inner cylinder 2 together.

  In each of the above-described embodiments, the workpiece is transferred in the opposite direction between the inner passage and the outer passage. However, the rotary kiln according to the present invention transfers the workpiece in the same direction in the inner passage and the outer passage. It can also be used for what you do.

  In each of the above-described embodiments, the number of scraping plates is six, but the number of scraping plates may be provided so that the inner cylinder can roll, and a ring for connecting the tip portion is provided. Two or more sheets may be used in the first embodiment, and three or more sheets may be used in the second embodiment in which no ring is provided.

a is a longitudinal sectional view showing the rotary kiln of the first embodiment, and b is a transverse sectional view of a. Sectional drawing along the II-II line of Fig.1 (a) FIG. 1 is an external perspective view showing the inner cylinder of FIG. FIG. 2 is a partially omitted sectional view showing a modification of the ring of FIG. Cross-sectional view showing a rotary kiln of a second embodiment a is a sectional view taken along the line VIa-VIa in FIG. 5, and b is a sectional view taken along the line VIb-VIb in FIG. a and b are sectional views for explaining a ground contact state of the inner cylinder to the inner cylinder inner surface when no ring is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 Feeder 4 Inner channel 5 Outer channel 6 Hood chamber 7 Tire 8 Rotation support roller 9 Outer heating furnace 10 Exhaust tube 11 Stopper 12 Stir blade 13 Scoop plate 14 Ring 14a Arc members 15a, 15b Press roller

Claims (3)

A rotary kiln having a double cylinder structure having an outer cylinder and an inner cylinder, and having an inner passage through which the workpiece is passed inside the inner cylinder, and another outer passage through which the workpiece is passed inside the outer cylinder outside the inner cylinder The outer cylinder is driven to rotate, and a plurality of scooping plates extending in the axial direction for scooping up the workpiece in the outer passage are provided radially on the outer diameter surface of the inner cylinder. A rotary kiln in which an inner cylinder provided with a scraping plate is placed so as to roll inside an outer cylinder that is driven to rotate . A ring for connecting the tip ends of the plurality of scooping plates in an annular shape at least in one axial direction is provided, and the inner cylinder is grounded to the inner diameter surface of the outer cylinder with the ring and is caused to roll. The rotary kiln according to 1. A pressure roller is provided for pressing both ends of the inner cylinder that rolls inside the outer cylinder to the front side of the rolling motion where the scraping plate scrapes up the object in the outer path, and the object to be processed in the outer path is provided. The rotary kiln according to claim 1, wherein a clearance between the tip of the scraping plate on the side for scraping an object and an inner diameter surface of the outer cylinder is regulated to be narrow.

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