JP5027186B2 - Rotary kiln - Google Patents

Description

  The present invention relates to a rotary kiln used for drying metal-worked cutting waste and the like.

  In steelworks, ironworks, etc., in order to reuse metal-worked cutting scraps such as generated iron scraps, attempts have been made to melt these and produce steel again.

  However, impurities such as moisture and lubricating oil are attached to these metal-containing cutting scraps containing iron, and an electric furnace method is used to produce steel by melting metal-working cutting scraps using a small electric furnace. When used, this impurity causes the impurities to stick to the furnace wall at the time when the metal-cutting chips are melted in the electric furnace, resulting in a decrease in work efficiency and electric efficiency. In addition, this impurity may be mixed into the desired steel product, or there may be a steam explosion due to the contained moisture, making it difficult to reuse it as it is. It is necessary to go through a drying process that dries the oil or skips the oil.

  Therefore, a rotary kiln is generally used when performing the drying process in this drying process.

  The rotary kiln has a cylindrical main body and is inclined and arranged, and by rotating the main body, the material to be dried thrown in from one end side is moved to the other end side, and provided on the other end side. The material to be dried can be dried by spraying high-temperature gas from a burner or the like.

  Such a conventional rotary kiln requires a longer cylindrical body and a larger burner output in order to increase the contact time with the hot gas from the burner, etc. It was connected to.

JP 2008-215699 A

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary kiln with high energy efficiency while preventing an increase in size of the apparatus.

  A rotary kiln according to the present invention includes a rotary kiln main body having an outer cylinder to which an object to be dried is supplied and an inner cylinder that is coaxially provided in the outer cylinder and to which the object to be dried is supplied from the outer cylinder. A supply duct that is provided in an inner cylinder of the rotary kiln main body and supplies the material to be dried to the outer cylinder, a rotation driving unit that rotationally drives the rotary kiln main body, and an inner cylinder of the rotary kiln main body. A first conveying means provided on a peripheral surface for conveying the material to be dried supplied from one end side of the rotary kiln main body to the other end side by rotational driving by the rotary driving means; and an inner part of the rotary kiln main body A second transport unit that is provided on an inner peripheral surface of the cylinder and transports the material to be dried supplied from the other end side of the rotary kiln main body to one end side by rotational driving by the rotational drive unit; The supply duct has a plurality of supply ports facing the inner peripheral surface of the outer cylinder, and the supply ports are different from each other in the axial direction of the rotary kiln body.

  In the present invention, since the rotary kiln main body has an outer cylinder and an inner cylinder, the overall length of the apparatus can be shortened, the output of a heat source such as a burner can be suppressed, and the apparatus is prevented from being enlarged. be able to. Further, according to the present invention, since the supply duct has a plurality of supply ports facing the inner peripheral surface of the outer cylinder, and the respective supply ports are different from each other in the axial direction of the rotary kiln main body, Is distributed into the outer cylinder while being dispersed, and the material to be dried can be continuously and efficiently supplied into the rotary kiln body.

  Further, according to the present invention, since the inner cylinder and the outer cylinder are coaxially arranged, they can be rotated by one rotation driving means, so that power saving of the apparatus can be realized.

It is the figure which showed the perspective view of the rotary kiln to which this invention is applied. It is the figure which showed typically sectional drawing along the rotating shaft of the rotary kiln to which this invention is applied. It is a partially broken perspective view of the rotary kiln main body of the rotary kiln to which the present invention is applied. It is a figure for demonstrating the 1st feed blade of the outer cylinder of the rotary kiln to which this invention is applied, and is a perspective view from the other end part side. It is a figure for demonstrating the inlet of the inner cylinder of the rotary kiln to which this invention is applied, and is a principal part perspective view from the other end part side. It is the perspective view which showed the shearing blade provided in a part of feed blade of a spiral conveyor.

  Hereinafter, a rotary kiln according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the rotary kiln 1 guides metal-cutting scraps 4 fed from the belt conveyor 2 to the feeding hopper 3 into the rotary kiln main body 11 via the spiral conveyor 5, so that the charging hopper of the rotary kiln main body 11 is introduced. The metal-worked cutting waste 4 is dried by a heat source introduced from the end opposite to the 3 side. The rotary kiln 1 uses, for example, a waste oil combustion device 41 as a heat source for drying the metal-worked cutting waste 4, and configures a drying device 40 in combination with the waste oil combustion device 41. The details of the waste oil combustion device 41 are omitted, but for example, the amount of kerosene, which is a supplementary fuel, described in Japanese Patent Application Laid-Open No. 2005-188899, which is the applicant of the present application, is reduced, and only the waste oil is stable. An apparatus that can perform such combustion is preferred. The heat source connected to the rotary kiln 1 is not limited to the waste oil combustion device 41 as described above, and may be a burner or the like.

  The rotary kiln 1 supplies a base 12, a rotary kiln main body 11 supported on the base 12 via a support roller 13, and a metal work cutting scrap 4 that is an object to be dried in the rotary kiln main body 11. It comprises a duct 17 and a motor 14 that rotationally drives the rotary kiln main body 11.

  The base 12 is a member made of a heat-resistant steel plate or the like, and a plurality of support rollers 13, a motor 14, and the like are fixed to a predetermined upper portion, and supports the rotary kiln main body 11 via the support rollers 13. It is a stand.

  The support roller 13 on the base 12 is a member that rotatably supports the rotary kiln main body 11. For example, the support roller 13 is provided at four places on the base 12.

  A rotary kiln main body 11 rotatably supported by a support roller 13 is a rotary furnace having an outer cylinder 15 and an inner cylinder 16 provided coaxially in the outer cylinder 15 as shown in FIGS. is there. The rotary kiln main body 11 is connected to a supply duct 17 for supplying the metal-worked cutting waste 4 into the outer cylinder 15.

  The outer cylinder 15 of the rotary kiln main body 11 has a substantially cylindrical shape with a diameter that allows the inner cylinder 16 to be contained therein, and is formed of a heat-resistant steel plate or the like. As for the outer cylinder 15, the metal-working cutting waste 4 is thrown in from the one end part 11a side of the rotary kiln main body 11 via the spiral conveyor 5 and the supply duct 17. FIG. As shown in FIG. 4, the outer cylinder 15 has a first feed blade that feeds and agitates the metal-worked cutting waste 4 to be introduced into the inner peripheral surface 15 a from the one end portion 11 a side to the other end portion 11 b side. 18 is provided. The outer cylinder 15 transmits the driving force from the roller receiving member 19 to which the roller of the support roller 13 is slidably contacted and the motor 14 that rotationally drives the rotary kiln main body 11 to the outer peripheral surface 15b via the chain belt 20. A transmission member 21 is provided. Furthermore, the outer cylinder 15 is provided with closing plates 22 and 22 that close both ends thereof. The closing plate 22 has a through-hole 22a formed at the center, and faces an inner cylinder 16 described later.

  The first feed blade 18 provided on the inner peripheral surface 15a of the outer cylinder 15 includes a conveying blade 18a for conveying the metal-worked cutting waste 4 from the one end 11a side to the other end 11b side, and the metal-working cutting waste 4 outside. It is comprised from the raising blade | wing 18b stirred up and stirred with the rotation of the pipe | tube 15. As shown in FIG. As shown in FIG. 4, the first feeding blade 18 is provided with a large number of conveying blades 18 a and scraping blades 18 b alternately along the rotation axis of the outer cylinder 15.

  The conveying blades 18a of the first feeding blade 18 are erected intermittently so that a large number of feeding blades are spiral from the one end portion 11a to the other end portion 11b on the inner peripheral surface 15a of the outer cylinder 15. . The conveying blade 18a is attached so as to incline in a direction to change the circumferential moving force into the axial moving force by the rotation of the outer cylinder 15. Therefore, the conveyance blade 18 a moves the metal-worked cutting waste 4 in the axial direction by the rotation of the outer cylinder 15. The scraping blade 18b is formed so that a plate-like member is bent at a substantially right angle and a trough 18c formed by bending the plate-like member faces the rotation direction of the outer cylinder 15. As the outer cylinder 15 rotates, the scraping blade 18b holds and scrapes the metal-worked cutting waste 4 in the valley portion 18c. Therefore, the metal-worked cutting scrap 4 scraped up by the scraping blade 18 b falls on the outer peripheral surface 16 b of the inner cylinder 16, comes into contact with the inner cylinder 16, and receives radiant heat from the inner cylinder 16. Further, the lifting blade 18b is not provided at a position facing supply ports 26a and 26b of the supply duct 17 described later, and is provided only at a position facing the staying blade 25 provided in the inner cylinder 16. This is to prevent the metal-worked cutting scrap 4 from being scraped up by the scraping blade 18b and falling into the supply ports 26a and 26b of the supply duct 17 and flowing backward. Further, a scraping blade 18b is formed in the outer cylinder 15 of the other end portion 11b at a position facing the introduction port 16c of the inner cylinder 16. This is because the metal-worked cutting waste 4 conveyed to the other end portion 11b side can be supplied one after another to the introduction port 16c.

  The inner cylinder 16 included in the outer cylinder 15 has a substantially cylindrical shape and is formed from a heat-resistant steel plate or the like. The inner cylinder 16 is provided so as to have the same central axis as the outer cylinder 15. The inner cylinder 16 conveys the metal-worked cutting waste 4 supplied from the other end portion 11b side to the one end portion 11a side, and discharges it to the recovery hopper 37 from the one end portion 11a side. The inner cylinder 16 has a supply duct 17 attached inside the one end portion 11a. In the inner cylinder 16, the combustion heat of the waste oil combustion device 41 is introduced from the other end portion 11 b side. In addition, the inner cylinder 16 is provided with a plurality of introduction ports 16c on the peripheral surface on the other end 11b side. In the inner cylinder 16, the metal-worked cutting waste 4 conveyed through the outer cylinder 15 from the introduction port 16 c is introduced. Further, as shown in FIG. 2, the inner cylinder 16 is configured to convey and agitate the metal-worked cutting waste 4 introduced from the introduction port 16c from the other end portion 11b side to the one end portion 11a side on the inner peripheral surface 16a. Two feed blades 23 are provided. Further, the metal-worked cutting waste 4 scraped up by the first feed blade 18 of the outer cylinder 15 and falling on the outer peripheral surface 16b is brought into contact with the inner cylinder 16 for a longer time on the outer peripheral surface 16b of the inner cylinder 16. A staying blade 25 is formed.

  As shown in FIG. 5, the introduction port 16 c provided on the other end portion 11 b side of the inner cylinder 16 prevents the metal cutting chips 4 to be introduced from passing through the inner cylinder 16 and returning to the outer cylinder 15 again. For example, three locations are provided on the peripheral surface of the inner cylinder 16 at regular intervals, for example. The introduction port 16c has an introduction plate 28 for introducing the metal-worked cutting scrap 4 scraped up in the outer cylinder 15 into the introduction port 16c on the rear end side in the rotation direction on the outer peripheral surface 16b side of the inner cylinder 16. Is provided. A mounting flange 27 is provided on one end 11a side of the introduction port 16c, and a closing plate 22 is provided on the other end 11b side. The introduction plate 28 is attached to the mounting flange 27 and the closing plate 22 at both end surfaces in the axial direction. The introduction plate 28 is attached to the outer peripheral surface 16b of the inner cylinder 16 so as to be inclined in the rotation direction. This is an inclination for introducing the metal-worked cutting waste 4 scraped up by the outer cylinder 15 into the introduction port 16c. Further, the introduction port 16c prevents the metal-worked cutting waste 4 introduced by the rotation of the inner cylinder 16 from dropping again to the outer cylinder 15 at the front end side in the rotation direction on the inner peripheral surface 16a side of the inner cylinder 16. A fall prevention plate 29 is provided. The fall prevention plate 29 is attached so as to be inclined so as to slightly cover the introduction port 16 c with the inner peripheral surface 16 a of the inner cylinder 16. Moreover, the conveyance blade 23a is provided in the internal peripheral surface 16a of the inner cylinder 16 in the adjacent inlet 16c, and the fall prevention plate 29 is connected in the edge part. This is for conveying the metal-worked cutting waste 4 introduced into the inner cylinder 16 through the one inlet 16c to the one end 11a side. Between the adjacent inlets 16c, 16c, a conveying blade 23 and a fall prevention plate 29 are provided, and the fall prevention plate 29 is disposed at an inclination. The rotation of 16 jumps over the introduction port 16 c and is prevented from falling on the outer cylinder 15.

  Thus, the introduction port 16c of the inner cylinder 16 is surrounded by the mounting flange 27 and the closing plate 22, and the introduction plate 28 is provided, so that the other end portion 11b side is on the outer peripheral surface 16b of the inner cylinder 16. It is possible to reliably introduce the metal-worked cutting scraps 4 scraped up.

  In addition, as described above, the introduction port 16c is not limited to being provided at three locations on the peripheral surface of the inner cylinder 16, but the metal-worked cutting waste 4 introduced from the outer cylinder 15 passes through the inner cylinder 16 and is removed again. What is necessary is just to provide in the position which can prevent returning to the pipe | tube 15, ie, the position where the two inlets 16c and 16c do not oppose. Further, the inner cylinder 16 is not limited to the provision of the fall prevention plate 29, and any metal cutting chips 4 that are introduced can be prevented from dropping again into the outer cylinder 15 through the inlet 16c. For example, a standing wall may be formed at the peripheral edge of the introduction port 16c.

  The second feed blade 23 provided on the inner peripheral surface 16a of the inner cylinder 16 is similar to the first feed blade 18 in that one end portion from the other end portion 11b side of the metal processing cutting waste 4 introduced from the introduction port 16c. It is comprised from the conveyance blade | wing 23a conveyed to the 11a side, and the scraping blade | wing 23b which scoops up and stirs the metal processing cutting waste 4 with the rotation of the inner cylinder 16. FIG. As shown in FIG. 3, the second feeding blade 23 has a large number of conveying blades 23 a and scraping blades 23 b arranged alternately along the rotation axis of the inner cylinder 16. Moreover, the 2nd sending blade 23 is provided intermittently so that the combustion heat from the waste oil combustion apparatus 41 can fully be sent to the one end part 11a side.

  The second feed blade 23 is the first feed except that the rotation direction of the spiral formed by the plurality of transport blades 23 a is opposite to the transport blade 18 a of the first feed blade 18. Since it has the same configuration as that of the feed blade 18, its detailed description is omitted. When the outer cylinder 15 and the inner cylinder 16 are rotated together because the rotation direction of the spiral by the conveying blade 23a of the second feeding blade 23 is opposite to the conveying blade 18a of the first feeding blade 18. The conveying direction of the metal-working cutting waste 4 inside is reversed. Thus, by providing the first feed blade 18 and the second feed blade 23 in the outer cylinder 15 and the inner cylinder 16, respectively, the rotation directions of the outer cylinder 15 and the inner cylinder 16 can be made the same, The number of motors 14 can be one, and the conveyance direction can be reversed.

  The conveyance blade 23a may have an inclination with respect to the axial direction different from that of the conveyance blade 18a according to a desired speed to be conveyed. That is, when it is desired to make the conveyance speed in the outer cylinder 15 different from the conveyance speed in the inner cylinder 16, this can be dealt with by changing the inclination of each of the conveyance blades 18a and 23a with respect to the axial direction. Further, the inclination may be changed according to the position of the inner cylinder 16 in the axial direction. That is, by changing the inclination of the transport blade 23a, the transport speed on the other end 11b side and the transport speed on the one end 11a side can be made different. Further, the height of the conveying blade 23a may be changed. For example, when it is desired to reduce the arrival of the combustion heat to the one end portion 11a side, the height of the conveying blade 23a may be increased.

  A plurality of staying blades 25 of the inner cylinder 16 are provided across the axial direction of the outer peripheral surface 16b. The staying blades 25 are plate-like members erected on the outer peripheral surface 16b. For example, eight staying blades 25 are provided at equal intervals on the outer peripheral surface 16b. The staying blade 25 is used to make the staying blade 25 stay on the outer peripheral surface 16b when the metal-worked cutting scrap 4 scraped up by the scraping blade 18b of the outer tube 15 falls on the outer peripheral surface 16b of the inner tube 16. belongs to. Thus, the metal-working cutting waste 4 stays on the inner cylinder 16 so that it can receive the radiant heat of the combustion heat from the waste oil combustion device 41 introduced into the inner cylinder 16. It will be heated more efficiently.

  As shown in FIGS. 2 and 3, the supply duct 17 is attached to the one end 11 a side of the inner cylinder 16. The supply duct 17 is made of an annular member having a diameter smaller than that of the inner cylinder 16, and the spiral conveyor 5 as the material to be dried is inserted from one end 17a thereof, and at the other end 17b, the first supply port 26a and the second supply port 17 are provided. The supply port 26b is branched into two ducts. The supply duct 17 is supplied with metal-working cutting waste 4 conveyed from one end 17 a to the spiral conveyor 5, and transfers the supplied metal-working cutting waste 4 to the outer cylinder 15. The supply duct 17 has a peripheral portion of the first and second supply ports 26 a and 26 b connected to the inner cylinder 16, and a plurality of brackets (not shown) erected from the inner peripheral surface 16 a of the inner cylinder 16. It is fixed to the inner cylinder 16. Further, the supply duct 17 is rotated on the inner peripheral surface of the supply duct 17 so that the metal-cutting chips 4 to be introduced are transferred from the one end 17a to the first and second supply ports 26a and 26b. Many blades 17c are formed. The conveying blade 17c has the same configuration as the conveying blades 18a and 23a provided on the outer cylinder 15 and the inner cylinder 16.

  The first and second supply ports 26a and 26b of the supply duct 17 are disposed so as to penetrate the peripheral surface of the inner cylinder 16 and to face the inner peripheral surface 15a of the outer cylinder 15, respectively. The first supply port 26a and the second supply port 26b are different in the position provided in the axial direction. That is, the position of the first supply port 26a in the axial direction is formed closer to the one end 17a than the second supply port 26b. The first supply port 26a and the second supply port 26b are formed so that the positions in the circumferential surface direction of the inner cylinder 16 are equally spaced. That is, the first supply port 26 a is provided with the second supply port 26 b at a position whose phase is shifted by 180 degrees with respect to the peripheral surface of the inner peripheral surface 15 a of the outer cylinder 15. In the supply duct 17, the positions of the first and second supply ports 26 a and 26 b in the axial direction and the circumferential direction are thus deviated, and thereby the metal working cutting waste 4 supplied from the spiral conveyor 5. Can be continuously supplied to the outer cylinder 15, and does not hinder the conveyance of the metal-worked cutting waste 4 subjected to the drying process that is conveyed inside the inner cylinder 16.

  In addition, the supply port provided in the supply duct 17 may be provided not only in two places as mentioned above but in three places. However, by increasing the number of supply ports, the ratio of the supply duct 17 occupying the inner peripheral surface 16a of the inner cylinder 16 is increased, which hinders the conveyance of the metal-worked cutting waste 4 in the inner cylinder 16; It is preferable to use a location.

  The closing plates 22 attached to both ends of the rotary kiln main body 11 close both ends of the outer cylinder 15 and support the inner cylinder 16 and the supply duct 17. As described above, the closing plate 22 is formed with the through-hole 22a. The inner cylinder 16 is fitted into the through-hole 22a, and the inner cylinder 16 is connected so as to have the same central axis as the outer cylinder 15. Has been. Thereby, the rotary kiln main body 11 rotates the inner cylinder 16 similarly by rotating the outer cylinder 15 by the motor 14. Moreover, since the supply duct 17 is attached to the inner cylinder 16, this supply duct 17 will also rotate together.

  As shown in FIG. 2, the spiral conveyor 5 that puts the metal-worked cutting scraps 4 to be dried into one end 17 a of the supply duct 17 has a substantially cylindrical trough 31 and a longitudinal direction inside the trough 31 along the longitudinal direction. A screw 32 that is rotatably provided and a screw drive motor 33 that rotates the screw 32 are provided. The spiral conveyor 5 is provided with a charging hopper 3 on the upstream side of the trough 31, and metal processing cutting waste 4 is charged.

  The trough 31 of the spiral conveyor 5 has a substantially cylindrical shape, the charging hopper 3 is attached to the upper part on the one end 31 a side, and the other end 31 b is inserted into the one end 17 a of the supply duct 17. As shown in FIG. 6, the screw 32 of the spiral conveyor 5 is inserted into the trough 31, and is a blade provided in a spiral shape so as to send the metal-worked cutting waste 4 from the one end 32a to the other end 32b. It is. A screw drive motor 33 is connected to the center shaft 32c, and the screw 32 is driven to rotate about the center shaft 32c. Further, as shown in FIG. 6, the screw 32 is provided with a shear blade 34 that shears the metal-worked cutting waste 4 that is input via the input hopper 3 at a part of the central axis 32 c in the axial direction. The shear blade 34 sandwiches the metal-worked cutting waste 4 conveyed from the upstream side with the inner peripheral wall 31 c of the trough 31, and shears by rotating the screw 32. The shear blade 34 is provided in the vicinity of the downstream of the charging hopper 3 and shears the metal cutting waste 4 to be charged so as to have a predetermined size or less.

  The spiral conveyor 5 having such a configuration supplies the metal processing cutting waste 4 to be supplied to the supply duct 17 while being finely sheared.

  Note that the spiral conveyor 5 is not limited to the above-described configuration, and any other means may be used as long as it can input the metal-worked cutting waste 4 into the supply duct 17.

  The charging hopper 3 attached to the spiral conveyor 5 is a member that inputs metal-worked cutting waste 4 to the spiral conveyor 5. The input hopper 3 includes, for example, a vibrator (not shown) and the like, and a predetermined amount of metal-worked cutting waste 4 is input to the spiral conveyor 5 by vibration of the vibrator.

  Further, the rotary kiln 1 is discharged from the rotary kiln main body 11 after the drying process is finished on the blower 35 for air-cooling the surface of the rotary kiln main body 11, that is, the outer peripheral surface 16b of the outer cylinder 15, and the one end 11a side. A duct 37 for exhausting the combustion gas of the waste oil combustion device 41 is provided while guiding the metal working cutting waste 4 to the discharge conveyor 36.

  The rotary kiln 1 having such a configuration rotates the rotary kiln main body 11 by driving the motor 14 and also rotates the combustion heat from the waste oil combustion device 41 from the other end portion 11b side of the inner cylinder 16. Take it into the main body 11. In the rotary kiln 1, the metal-worked cutting waste 4 is introduced into the supply duct 17 attached to the inner cylinder 16 via the spiral conveyor 5, and is supplied to the one end portion 11 a side of the outer cylinder 15 by the supply duct 17. In the outer cylinder 15, the metal-worked cutting waste 4 is agitated and conveyed from the one end portion 11 a to the other end portion 11 b by the first feed blade 18. At this time, the metal-worked cutting waste 4 is scraped up in the outer cylinder 15 by the scraping blade 18 b of the first feed blade 18 and falls on the outer peripheral surface 16 b of the inner cylinder 16. Then, the metal-worked cutting waste 4 that has fallen on the inner peripheral surface 16a of the inner cylinder 16 stays on the outer peripheral surface 16b of the inner cylinder 16 for a long time by the staying blade 25, and is heated by receiving radiant heat from the inner cylinder 16 Is done. Thereafter, the metal-worked cutting waste 4 is introduced into the inner cylinder 16 from the inlet 16c of the inner cylinder 16, and is dried in proximity to the waste oil combustion device 41 that is a heat source. Thereafter, the metal-worked cutting waste 4 is stirred and transported from the other end portion 11b to the one end portion 11a by the second feed blade 23, and is moved away from the waste oil combustion device 41 as a heat source and gradually radiated. Finally, the metal-worked cutting waste 4 that has undergone both the drying process and the heat dissipation process is discharged from the one end portion 11 a side of the inner cylinder 16.

  The rotary kiln 1 as described above has a triple structure of the supply duct 17, the inner cylinder 16, and the outer cylinder 15 on the one end 11a side of the rotary kiln main body 11, and the inner cylinder 16 on the other end 11b side. The outer cylinder 15 has a double structure. And in the rotary kiln 1, since the metal processing cutting waste 4 reciprocates from the outer cylinder 15 to the inner cylinder 16 and is subjected to a drying process, the entire length of the rotary kiln main body 11 can be shortened and the miniaturization can be achieved. . Moreover, since the rotary kiln 1 can shorten the full length of the rotary kiln main body 11, the output of the waste oil combustion apparatus 41 can be suppressed. Further, in the rotary kiln 1, the first feed blade 18 and the second feed blade 23 are intermittently provided in a spiral shape, so that the combustion heat of the waste oil combustion device 41 reaches the one end 11a side. It can be adjusted moderately. Moreover, the metal-worked cutting waste 4 to be input is heated by radiant heat as the first stage by being conveyed through the outer cylinder 15, and the heat source as the second stage is conveyed through the inner cylinder 16. Since the drying process is performed by directly receiving heat from the metal, the metal-worked cutting waste 4 easily reaches the atmosphere necessary for drying, and is efficient.

  Further, in the rotary kiln 1, the inner cylinder 16 and the outer cylinder 15 are coaxially arranged, and the supply duct 17 is also fixed to the inner cylinder 16 and is integrally connected by the closing plate 22, so that one motor 14 Therefore, power saving can be realized.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 Rotary kiln, 2 Belt conveyor, 3 Feeding hopper, 4 Metal processing cutting waste, 5 Spiral conveyor, 11 Rotary kiln main body, 12 Base, 13 Support roller, 14 Motor, 15 Outer cylinder, 15a Inner peripheral surface, 15b Outer peripheral surface 16 Inner cylinder, 16a Inner peripheral surface, 16b Outer peripheral surface, 16c Inlet port, 17 Supply duct, 17a One end, 17b Other end, 17c Conveying blade, 18 First feeding blade, 18a, 23a Conveying blade, 18b, 23b Raising blade, 18c Valley, 19 Roller receiving member, 20 Chain belt, 21 Transmission member, 22 Blocking plate, 22a Through port, 23 Second feeding blade, 25 Retaining blade, 26a First supply port, 26b Second Supply port, 27 Mounting flange, 28 Introduction plate, 29 Fall prevention plate, 31 trough, 32 screw, 33 screw Interview drive motor, 34 shear blade

Claims (7)

A rotary kiln main body having an outer cylinder to which an object to be dried is supplied, and an inner cylinder provided coaxially in the outer cylinder and to which the object to be dried is supplied from the outer cylinder;
A supply duct that is provided in the inner cylinder of the rotary kiln main body and supplies the material to be dried to the outer cylinder;
Rotation driving means for rotating the rotary kiln main body,
A first transport which is provided on the inner peripheral surface of the outer cylinder of the rotary kiln main body and transports the material to be dried supplied from one end side of the rotary kiln main body to the other end side by rotational driving by the rotational driving means. Means,
A second transport which is provided on the inner peripheral surface of the inner cylinder of the rotary kiln main body and transports the material to be dried supplied from the other end side of the rotary kiln main body to one end side by rotational driving by the rotational driving means. Means and
The supply duct has a plurality of supply ports facing the inner peripheral surface of the outer cylinder, and each supply port is a rotary kiln whose positions in the axial direction of the rotary kiln body are different from each other.   2. The rotary kiln according to claim 1, wherein the first and second transport means are each composed of a plurality of feed blades standing on the inner peripheral surface of the outer cylinder and the inner cylinder.   The rotary kiln according to claim 2, wherein an intake port for taking in heat from a heat source is provided on the other end side of the rotary kiln main body.   4. The rotary kiln according to claim 3, wherein the plurality of supply ports provided in the supply duct are out of phase so that positions in the circumferential direction of the inner circumferential surface facing the outer cylinder are equally spaced from each other.   The rotary kiln according to claim 4, wherein the inner cylinder of the rotary kiln main body is provided with a plurality of plate members on the outer peripheral surface thereof for retaining the material to be dried conveyed in the outer cylinder on the outer peripheral surface of the inner cylinder. . The supply duct is connected to a dry matter supply means for supplying the dry matter,
The dry matter supply means includes a cylindrical trough, a hopper disposed on the upstream side of the trough, a screw provided to be rotatable in the longitudinal direction inside the trough, and the screw is driven to rotate. 6. The rotary kiln according to claim 5, wherein the rotary kiln is a spiral conveyor comprising screw driving means.   The screw of the material to be dried supplying means has a plurality of shear blades for shearing the material to be dried so that the material to be dried introduced through the hopper has a predetermined size or less in a part of the longitudinal direction of the screw. The rotary kiln according to claim 6 provided.

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