JP2019066077A - End structure of rotary kiln - Google Patents

Abstract

To provide inner wall deposit removal means capable of efficiently removing inner wall deposit completely by simple means, at a furnace tail side of a rotary kiln of which an inner diameter is gradually changed along a rotating shaft direction.SOLUTION: An end structure 2 of a rotary kiln 1 includes a kiln body 10 as a hollow cylindrical rotor, and a scraper 30 for scraping off inner wall deposit of the kiln main body 10. In the end structure 2 of the rotary kiln, the scraper 30 has a supporting portion 32 and a scraping blade portion 31, the scraping blade portion 31 is disposed in a manner that a length to a blade edge of the scraping blade portion 31 from a rotation center axis of the kiln main body 10 at a furnace inner side is longer than a length to the blade edge at a material charging port side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to the end structure of a rotary kiln. More particularly, the present invention relates to the end structure of a rotary kiln provided with a scraper capable of suppressing the growth of the deposit on the inner wall of the kiln body.

  Conventionally, in the process of firing crude zinc oxide in a series of steps of recovering zinc from crude zinc oxide dust contained in steelmaking furnace dust etc., the main body which is a hollow cylindrical rotary furnace, and the outlet side of the main body Rotary kilns are widely used, which are equipped with a heating burner part arranged in the.

  In this rotary kiln, high temperature calcined ore which reaches 1000 ° C. or more and 1300 ° C. or less, high temperature gas, etc. pass through the internal space of the metallic shell (shell). And, the above-mentioned high temperature bake ore has a problem that it adheres to the inner wall of the kiln main body and grows into a ring-like inner wall deposit in a particularly high temperature region in the body of the rotary kiln, Measures have been proposed and are being implemented.

  As a general method of removing the deposit on the inner wall of the heating furnace, Patent Documents 1 and 2 disclose rotation of the scraper itself, rotary kiln, and the like by appropriately charging the scraper having a specific shape and structure into the kiln body. There has been proposed a method of physically removing the deposited inner wall deposits by rolling the scraper by its own rotation.

  The removal method of the inner wall deposit described in Patent Document 1 or 2 is to remove the grown inner wall deposit by mechanical load after its growth, so that the kiln is caused by falling of the inner wall deposit at the time of removal, etc. There is a risk that the inner wall deterioration and damage, or the load for removing the inner wall deposit may lead to deterioration and damage of the kiln body.

  Further, the removal methods by the above-mentioned mechanical means are all means for setting the discharge port where the inner wall deposit is likely to be accumulated finally in the kiln main body and the vicinity thereof as the target range of the main inner wall deposit removal operation. The scraper or the like used as the removal means is premised to be able to withstand strong loads and exert a strong cutting force. Furthermore, providing a movable rotary blade in a high temperature kiln not only makes the equipment complicated but also makes maintenance difficult because of wear and high temperature deterioration. Furthermore, in the case of the water cooling structure, there is also a risk of water leakage in the high temperature kiln.

  On the other hand, around the bottom of the rotary kiln, heat transfer from the exhaust gas causes deposition of relatively soft deposits by heating the surface of deposits and deposits, but if left unchecked, the gas passage cross-sectional area In the long run, it will impede the smooth transfer of gas. In order to avoid such a situation, there has been a problem that the operation of the rotary kiln has to be suspended to physically remove the above-mentioned inner wall deposit.

  However, with regard to the removal of the inner wall deposits on the furnace bottom side, which is a relatively low temperature range on the furnace inlet side which is a relatively low temperature range, in the kiln body, as in the case of the inner wall deposit removal method described in Patent Document 1 or 2. Conditions for the strength and cutting force of various removal means are not necessarily required, so a simpler and more efficient means for removing the inner wall deposit that is specialized for removing such deposits on the inner wall on the furnace bottom side is required. It was supposed to be.

  A raw material feeding device inserted and disposed in the furnace from the furnace bottom side of the kiln body and a mode fixed to the raw material charging device as a removal means specialized for the removal of the inner wall deposit in the vicinity of the furnace bottom of such a rotary kiln. An end structure of a rotary kiln has been developed which includes a scraper that scrapes off the inner wall deposits on the kiln body (Patent Document 3).

  However, usually, on the furnace butt side of the rotary kiln, the inner diameter near the raw material inlet is smaller than the inner diameter near the center of the furnace, and depending on the scraper disclosed in Patent Document 3, the above furnace butt side It is difficult to scrape away all deposits in the kiln body in response to the stepwise variation of the inner diameter of the inner wall in the vicinity, and the progress of the deposition of deposits in the range where the scraping becomes insufficient is sufficiently suppressed The problem of not being able to be recognized has come to be newly recognized.

JP-A-8-313156 Japanese Patent Application Laid-Open No. 2002-81866 JP, 2014-185840, A

  In view of the above situation, according to the present invention, on the furnace bottom side of the rotary kiln in which the inner diameter changes stepwise along the rotational axis direction, the inner wall deposit can be efficiently removed to every corner by a simple means. It is an object of the present invention to provide means for removing

  The inventors of the present invention are materials for inserting the end structure of the rotary kiln into the furnace from the furnace bottom side of the kiln body as a means for suppressing removal of the inner wall deposit on the furnace bottom side of the rotary kiln simply and reliably. By including a feeding device and a scraper scraping off the deposit adhering to the inner wall of the kiln body in a manner fixed to the raw material feeding device, and further, the flat shape of the scraper is made into a unique flat shape of one end. It has been found that the above problems can be solved, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) A kiln main body which is a hollow cylindrical rotating body, and a fixed scraper which is installed on the furnace bottom side of the interior of the kiln main body and scrapes the deposit on the inner wall of the kiln main body when the kiln main body rotates. An end structure of a rotary kiln, comprising: a material input port formed by opening a part of a end surface of the cylindrical body on the furnace bottom side of the kiln body; The scraper has a support portion disposed along a direction from the central axis of rotation of the kiln body toward the outer periphery, and a plate-like scraping blade portion installed at the tip of the support portion. The scraping blade portion is such that the length from the central axis of rotation of the kiln main body to the blade edge of the scraping blade on the raw material inlet side is longer than the blade edge inside the furnace. Placed, End structure of Tarikirun.

  (2) The end structure of a rotary kiln according to (1), wherein the scraper has a support portion disposed along a horizontal radial direction of a vertical cross section circle of the kiln body.

(3) The apparatus further comprises a raw material feeding device inserted and disposed in the furnace from the furnace bottom side of the kiln body,
The end structure of the rotary kiln according to (1) or (2), wherein the scraper is fixedly installed on the raw material feeding device.

  (4) The support portion is composed of a plurality of plate-like or rod-like support portions, and the scraping blade portion is composed of a plurality of plate-like members connected at the tips of the plurality of support portions The end structure of the rotary kiln according to any one of (3) to (3).

  According to the present invention, on the furnace butt side of the rotary kiln in which the inner diameter changes stepwise along the rotational axis direction, the means for removing the inner wall deposit that can efficiently remove the inner wall deposit to all corners by simple means. Can be provided.

It is sectional drawing which shows typically the whole structure of the rotary kiln provided with the edge part structure of the rotary kiln of this invention. It is sectional drawing which shows typically the edge part structure of the rotary kiln of this invention. It is a perspective view which shows typically the structure of the principal part of the edge part structure of the rotary kiln of this invention. It is a top view which shows typically the structure of the principal part of the edge part structure of the rotary kiln of this invention. It is a front view which shows typically the structure by the side of the raw material insertion opening of a rotary kiln provided with the edge part structure of the rotary kiln of this invention. It is a schematic diagram by which it uses for description of the removal effect of the inner-wall deposit by the edge part structure of the rotary kiln of this invention.

  Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments. Hereinafter, although an embodiment at the time of applying an end part structure of a rotary kiln of the present invention to a large-sized rotary kiln for dry heating used for firing of zinc calcine ore, the present invention relates to a cylindrical rotary furnace If it is, it is the technology which is applicable to other various heating furnaces.

<Rotary kiln>
First, with reference to FIGS. 1 to 5, the overall configuration and usage of a rotary kiln 1 which is an example of a rotary kiln to which the end structure of the rotary kiln of the present invention can be preferably applied will be described. By providing the rotary kiln 1 with the end portion 2 of the rotary kiln of the present invention, it is possible to efficiently remove the inner wall deposit on the furnace butt side of the rotary kiln.

  The rotary kiln 1 has a hollow cylindrical rotating body, a kiln body 10, a raw material feeding device 20 inserted from a raw material feeding port 11 and disposed toward the inside of the furnace, a burner portion 40, a drive gear 50, a fixed hood 60, and It is a rotary heating furnace provided with a kiln support (not shown) supporting the kiln body 10. The kiln main body 10 is normally 1 to 1 with respect to the horizontal plane in a direction in which the material 3 to be fired moves from the raw material inlet 11 which is the inlet of the material 3 to be discharged to the discharge port 12 for discharging the material 3 to be fired. It is installed with a slope of 4%. Then, the material to be fired 3 is fired while being rotated in the R direction by the drive gear 50.

  The end structure 2 of the rotary kiln, which constitutes a part of the rotary kiln 1, has a scraper 30 fixedly installed inside the furnace bottom side of the kiln body 10, for scraping off an inner wall deposit made of the material 3 to be fired. It is a structure. Fixing of the scraper 30 is preferably by a structure installed in the raw material feeding device 20.

  The kiln body 10 is not particularly limited as long as it is a cylindrical pot having fire resistance, but a refractory such as a monolithic refractory such as mortar or a refractory brick is attached to the inner surface of a metal shell made of carbon steel or the like. Is preferable. A raw material insertion port 11 in which a part of the surface is opened is formed on the end face on the furnace bottom side of the cylindrical kiln body 10, and usually, the raw material insertion device 20 is provided from the raw material insertion port 11. It is inserted.

  At the furnace bottom side where the raw material inlet 11 is formed in the kiln body 10, at least the inner diameter of the inner wall around the raw material inlet 11 is smaller than the inner diameter of the inner wall inside the furnace. In addition, on the furnace bottom side of the kiln body 10, the inner diameter may be gradually increased toward the inside of the furnace. The end structure 2 of the rotary kiln of the present invention is preferably applicable to a general internal structure on the furnace bottom side of such a kiln body 10.

  The raw material loading device 20 is a device for loading the material to be fired 3 which is carried out from the previous step prior to firing by the rotary kiln 1 into the kiln body 10. Well-known apparatuses, such as a belt conveyor and a screw conveyor, can be used suitably. However, it is more preferable to have a shape and a structure capable of stably fixing the scraper 30 outside the top surface side. The raw material feeding device 20 is stably installed at an appropriate position by a support means (not shown) provided outside the kiln body 10.

  The scraper 30 has a structure in which a scraping blade portion 31 formed of a member capable of scraping off the deposit on the inner wall is installed or formed at the tip of the support portion 32. The support part 32 and the scraping blade part 31 can each be comprised with a plate-shaped member, as shown to FIG. 3 and FIG. However, it is not essential that the support portion 32 and the scraping blade portion 31 be formed by connecting individual members. For example, the scraper 30 may be a scraper having a shape that can exhibit the same function and effect regarding scraping, and the support portion 32 and the scraping blade portion 31 may be integrally molded.

  The scraper 30 preferably has a plate-like or substantially plate-like outer edge shape as a whole, and the plane shape thereof may be a shape of one-sided end as shown in FIGS. 3 and 4. . More specifically, regarding the planar shape of the scraper 30, the length inside the furnace is more than the length from the rotation center axis of the kiln main body on the raw material inlet 11 side of the kiln main body 10 to the cutting edge of the scraping blade portion 31. The planar shape may be such that the scraping blade portion 31 is disposed to be large.

  The details of the extent of the end of the scraping blade 31 described above depend on the opening diameter and the opening position of the raw material inlet 11 of the individual kiln body 10 and the shape of the inner wall of the kiln body 10 on the furnace bottom side, ie The position of the tip of the blade portion of the scraping blade portion 31 is made to approach the inner wall of the kiln body 10 in an appropriate necessary range according to the gradual expansion aspect of the inner diameter of the kiln body 10 in the installation range of the scraper 30 The arrangement may be adjusted accordingly.

  The scraper 30 is disposed in the direction from the central axis of rotation of the kiln body 10 toward the outer periphery, preferably along the radial direction of the vertical cross section circle, in the vicinity of the furnace bottom side inside the kiln body 10. However, the disposition direction of the scraper 30 is defined as -90 ° in the vertical downward direction, 90 ° in the vertical upward direction, and 0 ° in the horizontal direction in the middle among the radial directions extending 360 ° of the above vertical cross section circle. In the case, it is preferably in the range of -90 ° to 60 °, more preferably in the range of -15 ° to 0 °, that is 0 °, that is, horizontal in the radial direction of the vertical cross section circle It is most preferable that the arrangement direction is along the radial direction.

  The disposition direction of the scraper 30 is preferably oriented in the horizontal direction as described above, so that the scraped deposits reattach mainly to the other places in the kiln main body such as the upper surface of the raw material feeding device Can be prevented from depositing. When installed downward rather than in the horizontal direction, the risk of damage to the scraper 30 due to contact with the in-furnace matter increases. If the temperature is lower than -45 °, the flow effect of the material to be fired inherent to the kiln will be hindered, which is not preferable. On the other hand, in the case of being installed upward from the horizontal direction, there is a risk that the adhesion of the scraped deposits on the raw material feeding device 20 and the like due to the scattering can not be prevented.

  As described above, since the rotational axis of the kiln body 10 usually has an inclination of 1 to 4% with respect to the horizontal direction, the scraper 30 more specifically includes the rotational axis inclined to this degree, and the rotational axis. It is the most preferred embodiment to be arranged in a plane formed by a horizontal line perpendicular to the axis.

  The length in the rotational axis direction of the kiln body 10 of the scraper 30 is not particularly limited, but is preferably about 1.0 m to 1.5 m.

  The material of each member such as the support portion 32 and the scraping blade portion 31 constituting the scraper 30 may be a material having heat resistance that can withstand use in a high temperature environment of about 900 ° C., preferably about 900 to 1200 ° C. Just do it. Stainless steel etc. can be mentioned as a specific example of a preferable material.

  The mechanical strength and rigidity of the scraper 30 are not necessarily required to be equal to the strength of the scraper used on the side of the outlet 12 in the conventional kiln body. Unlike the conventional general removing member, the scraper 30 according to the present invention does not remove the grown, hardened inner wall deposit, and it is in a relatively soft state immediately after the introduction which is in the stage before the growth proceeds. This is because the inner wall deposit on the object is to be removed.

  The structure of the scraper 30 may be, for example, a structure in which a single scraping blade portion is installed or formed at an end of a supporting portion formed of a single plate-like member, as shown in FIGS. As shown in FIG. 6, at the tip of each of the plurality of plate-like support portions 32a, 32b, 32c, 32d made of the above-mentioned material, a plurality of plate-like members 31a, 31b, 31c constituting the scraping blade portion 31. Are preferably supported and articulated, and each of the members is hollow. Even with such a structure, it is possible to provide the scraper 30 with the necessary and sufficient strength, while making such a hollow structure avoid the deposition of in-furnace remnants on the upper surface of the scraper 30. it can. Also, this can prevent the securing of a sufficient gas passage cross-sectional area from being hindered, and can maintain a smooth gas flow inside the kiln body 10.

  The scraper 30 is relatively easy to be reduced in weight because it is made of the above-described material and structure, and is intended to remove a relatively soft inner wall deposit. Even when used as a support, it can be installed without applying an excessive load thereto.

  When the scraper 30 is fixed to the outer upper surface of the raw material feeding device 20 or the like in the furnace bottom side of the kiln body 10, that is, in the furnace space in the vicinity of the raw material feeding port 11, the disposition position of the scraper 30 is the kiln body 10 Are defined to optimize the relative position of the scraping blade 31 to the inner wall of the.

  The arrangement position of the scraper 30 with respect to the rotational axis direction of the kiln main body 10 is preferably such that the scraping blade portion 31 is from the end of the kiln main body 10 on the side of the raw material inlet 11 with respect to the rotational axial direction of the kiln main body 10 It is preferable to set the position so as to be disposed in a distance range of 0 m or more and 2.0 m or less, more preferably 0.5 m or more and 1.5 m or less. There is a risk that the securing of the gas passage cross section near the raw material inlet will be hindered. In addition, in a rotary kiln of a general size, it is necessary to secure a sufficient gas passage cross-sectional area, but the range in which the deposition of the deposit is most easily promoted is the above range. If the distance from the end is less than 0.5 m, installation may not be possible due to the positional relationship with the end face. When the scraper 30 is fixed to the outer upper surface of the raw material feeding device 20 such as a screw conveyor, the arrangement position of the scraper 30 with respect to the rotational axis direction of the kiln body 10 is the same as that of the raw material charging device 20 as shown in FIG. It is preferable to make it the range to the front-end | tip part inside furnace. Since the gas temperature on the furnace bottom side of the kiln body 10 is usually less than 1000 ° C., by disposing the scraper 30 in a range satisfying such conditions, the material immediately after being introduced into the kiln body 10 by the material introducing device 20 It can be scraped off with a minimum load at a stage before the material to be fired 3 grows as a solid mass.

  The distance between the scraping blade portion 31 at the tip of the scraper 30 and the inner wall of the kiln body 10 may be appropriately adjusted in accordance with various physical properties such as particle diameter and viscosity of the material to be fired. Generally, it is preferable that the distance between the scraping blade 31 and the inner wall of the kiln body 10 be about 100 mm to 150 mm. This distance can be optimized by adjusting the shape of the scraper 30 if the position of the material feeding device 20 has already been fixedly determined with respect to the kiln body 10. In particular, when the scraper 30 has the above-described hollow structure, such positional adjustment can be easily performed by changing the length of the support portion 32.

  In the scraper 30, as shown in FIG. 4, the angle members 33 (33a, 33b, 33c, 33d) having an L-shaped cross section are covered on the support portions 32 (32a, 32b, 32c, 32d), respectively. The upper surface thereof may be shaped like a triangular roof. Thereby, the rigidity of the support portion 32 can be enhanced, and the deposition of the in-furnace floating material on the upper surface of the support portion 32 can be prevented. Further, as shown in FIG. 5, a reinforcing angle 34 for assisting the support portion 32 may be further installed.

  The burner unit 40 is a heating device such as a heavy oil burner provided near the outlet 12 side of the kiln body 10, which serves as a heat source for the rotary kiln 1 and can heat the interior of the kiln body 10 to 1100 ° C to 1300 ° C. Just do it. Further, the drive gear 50 can transmit the rotational force in the direction R in the figure to the kiln body 10, and the fixed hood 60 can prevent the diffusion of the exhaust gas discharged from the kiln body 10 Good.

  In the rotary kiln 1 having the above configuration, the inside of the kiln body 10 is heated to a high temperature of about 900 ° C. or more and 1300 ° C. or less by the burner unit 40, and the raw material is charged while rotating the kiln body 10 in the R direction by the drive gear 50. The material to be fired is introduced into the direction a shown in FIG. While the material to be fired is stirred and fired along the inclination of the kiln body 10, it moves in the kiln body 10 toward the direction of the outlet 12, and from the outlet 12, the high temperature material to be fired is in the b direction Exhausted.

<Rotary kiln edge structure>
Next, with reference to FIG. 2 to FIG. 6, the configuration and effects of the end structure of the rotary kiln (hereinafter, also simply referred to as "end structure") of the present invention will be described in more detail.

As shown in FIG. 2, in the end structure 2, the material to be fired 3 is transported in the a ₀ direction by the raw material feeding device 20, and then kilns toward the a ₁ direction near the end portion of the raw material feeding device 20. It falls to the inner wall of the main body 10. First, the material to be fired 3 starts to grow as an inner wall deposit around this dropping point. As shown in FIG. 2, the scraper 30 is preferably fixed in a range including immediately above the falling point of the material 3 to be fired. Since the scraper 30 is fixed at such a position, the material to be fired 3 can be efficiently peeled off and removed from the inner wall before it is grown as the inner wall deposit.

  Further, since the planer shape of the scraper 30 is a one-sided end shape as shown in FIG. 4, first, for the deposit 3 c deposited in the vicinity of the raw material feeding device 20, the opening portion of the raw material inlet 11 is The growth of soot deposits can be reliably prevented. And, at the same time, in the range on the center side in the furnace including the dropping point of the material 3 to be fired, sufficient passage of the gas can be cut by bringing the scraping blade 31 close to the inner wall of the kiln body to a necessary and sufficient degree. In this range where deposition of deposits is likely to be promoted while securing the area is required, deposits can be sufficiently removed. As described above, the scraper 30 has the scraping blade portion 31 arranged at an optimal horizontal position adapted to the internal structure and the shape in the vicinity of the raw material insertion port on the furnace bottom side of the kiln body 10. With the above-described operation, in the end structure 2, it is possible to prevent in advance the situation in which the inner wall deposit adheres to the furnace bottom side and causes the furnace to be blocked.

  Further, as shown in FIG. 6, the disposition direction of the scraper 30 is disposed along the horizontal radial direction of the vertical cross section circle of the kiln body 10, the upper surface of the raw material feeding device 20, etc. in the kiln body. It is possible to prevent the scraped deposits from reattaching and depositing on other places. A part of the material to be fired 3a immediately after dropping from the material feeding device 20 to the inner wall of the kiln body 10 adheres to the inner wall of the kiln body 10 and moves upward with the rotation of the kiln body 10 (3b) The scraper 30 collides with the scraping blade portion 31 and is peeled off from the inner wall of the kiln body 10 and falls to the bottom of the kiln body 10. Due to the configuration and the function and effect of the end structure 2 as described above, the inner wall deposit made of the material to be fired 3 is removed from the inner wall of the kiln body 10 before it grows large. Therefore, it is possible to prevent in advance the situation in which the inner wall deposit adheres to the furnace bottom side and the furnace is blocked. In addition, it is possible to prevent the deposit that has been scraped off on other structures in the kiln body 10, such as the material feeding device 20. In addition, this can prevent, in advance, a situation in which the deposit on the inner wall grows on the furnace bottom side and the furnace is blocked.

  In addition, as long as it is an end structure including a structure which is a part of a rotary kiln in the above-mentioned mode that can scrape off the inner wall deposit during operation of the rotary kiln, the scraper is always fixed to the raw material feeding device. It is within the range equivalent to the end structure of the rotary kiln of the present invention even if it does not have the same structure.

  Heretofore, in order to remove solid wall deposits, which are solid lumps grown in a rotary kiln, it has been essential to use a specially shaped scraper having a strong rigidity, while applying a load to the main body of the kiln. However, according to the end structure 2 of the present invention, the scraper 30 can be stably installed at a position that becomes the growth start point of the deposit on the inner wall on the furnace bottom side. In addition, by using the material input device 20, which is an essential component at the time of operation of the rotary kiln 1, to use the material 3 to be fired 3 as a support of the scraper 30, additional installation of a new structure is achieved. The structure is minimal and extremely excellent in terms of installation cost.

  The above-described end structure of the rotary kiln has the following effects.

  (1) In a rotary kiln in which the material to be fired is fired at a high temperature, a means for efficiently removing the deposit on the inner wall particularly on the side of the material inlet of the rotary kiln has been desired. So, in invention of (1), the end part structure of the rotary kiln which consists of an original structure was developed as a means to remove the inner-wall deposit in a rotary kiln. In this end structure, a fixed scraper having a flat shape that is wide on one side is installed in the vicinity of the raw material insertion port on the furnace bottom side in the kiln main body. According to this end structure, on the furnace bottom side of the rotary kiln having a structure in which the inner diameter changes stepwise along the rotational axis direction, the inner wall deposit is efficiently removed to every corner by a simple means, Growth of kimono can be suppressed.

  (2) Further, with regard to the arrangement direction of the scraper in the invention of (1), it is more preferable to specify this as the arrangement along the horizontal radial direction of the vertical cross section circle of the cylindrical rotary kiln. According to this, it is possible to prevent re-adhesion and deposition of the scraped deposits on other places in the kiln main body such as the upper surface of the raw material feeding device. This makes it possible to prevent the reduction of the gas passage cross section in the kiln body.

  (3) Further, as for the fixing position of the scraper, it is more preferable to adopt a structure in which the scraper is fixedly installed on the raw material feeding device inserted and disposed in the furnace from the furnace bottom side of the kiln body. According to this, the installation cost of the scraper can be greatly reduced by using the raw material feeding device, which is an essential component at the time of operation of the rotary kiln, in a combined manner as a support for the scraper in order to load the material to be fired. can do.

  (4) Moreover, it is more preferable to make the structure of a scraper into a simple structure with many hollow parts which the member for several scraping blade parts is connected by several support parts. According to this, the superiority over the conventional product can be further enhanced in terms of easy fine adjustment of the horizontal position of the scraping blade and in terms of manufacturing cost. In addition, it is possible to prevent the material to be fired which has fallen from depositing on the scraper.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above. Further, the effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects by the present invention are limited to those described in the examples of the present invention. is not.

DESCRIPTION OF SYMBOLS 1 Rotary kiln 10 Kiln main body 11 Raw material insertion port 12 Discharge port 2 End structure 20 Raw material injection | throwing-in apparatus 3 Baking object 30 Scraper 31 Scraping blade part 32 Support part 33 Angle part 34 Reinforcement angle 40 Burner part 50 Drive gear 60 Fixed hood

Claims (4)

A kiln body which is a hollow cylindrical rotating body, and a fixed scraper installed on the furnace butt side of the interior of the kiln body and scraping off the deposit on the inner wall of the kiln body when the kiln body rotates. End of the rotary kiln,
On the furnace bottom side of the kiln body, there is formed a raw material inlet in which a part of the end surface of the cylindrical kiln body is opened,
The scraper has a support portion disposed along a direction from the central axis of rotation of the kiln body toward the outer periphery, and a plate-like scraping blade portion installed at the tip of the support portion.
The scraping blade portion is such that the length from the central axis of rotation of the kiln main body to the blade edge of the scraping blade on the raw material inlet side is longer than the blade edge inside the furnace. The end structure of the rotary kiln is located.   The rotary kiln end structure according to claim 1, wherein the scraper has a support portion disposed along a horizontal radial direction of a vertical cross-sectional circle of the kiln body. The apparatus further comprises a raw material feeding device inserted and disposed in the furnace from the furnace bottom side of the kiln body,
The rotary kiln end structure according to claim 1, wherein the scraper is fixedly installed on the raw material feeding device.   The said support part consists of a several plate-shaped or rod-shaped support part, The said scraping blade part consists of several plate-shaped members connected in the front-end | tip of several said support part. The end structure of the rotary kiln according to any of the preceding claims.

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