JP5009331B2 - Drum type granulator and granulation method - Google Patents

Description

  The present invention relates to a drum-type granulator and a granulation method, and more particularly, to a drum-type granulator and a granulation method for preventing adhesion of a granulated material to an inner peripheral surface of a drum.

  Conventionally, a drum type granulator is widely used as a granulator for granulating various raw materials composed of powder and granules. For example, even in the pretreatment step of the sintered raw material, the sintered raw material containing iron ore particles is granulated by a drum type granulator, and the obtained granulated material having a particle size of about several mm is sintered. It is common to put in

  In a drum granulator, while rotating a cylindrical rotating drum arranged in an inclined manner, a raw material (granulated material) to which at least one of a binder and water is added is put into the rotating drum, and the raw material Is a structure in which the raw material rolls and granulates in the rotating drum while it moves from the inlet side to the outlet side of the rotating drum (see, for example, Patent Document 1). In such a drum type granulator, when a highly adherent raw material such as a sintered raw material is granulated, the raw material adheres to the inner peripheral surface of the drum, so that proper rolling granulation can be performed. However, there was a problem that the granulated product could not be stably produced.

  In order to cope with such a problem, in the conventional drum type granulator, as shown in FIG. 1, in order to prevent the raw material from adhering to the inner peripheral surface 2 of the rotating drum 1, the inner peripheral surface 2 of the rotating drum 1. A rubber liner 3 (a lining material made of a rubber sheet, which is an elastic body), was mounted on the rim. Further, by providing a space between the inner peripheral surface 2 of the rotary drum 1 and the rubber liner 3, a rubber liner having elasticity when the rubber liner 3 moves upward as the rotary drum 1 rotates. By utilizing the fact that 3 is deformed so as to be bent downward due to gravity, adhesion of the raw material to the rubber liner 3 is also prevented.

  For example, in Patent Document 2, a rubber sheet is fixed on the inner peripheral surface of a rotating drum so that the cross section is corrugated, and the longitudinal direction formed between the rubber sheet and the inner peripheral surface of the drum is fixed. A rotary granulation apparatus in which a support made of a rubber-like elastic body is provided in each space is disclosed. Further, Patent Document 3 discloses that a rubber lining material is provided on the drum inner peripheral surface of the granulator, and a closed space is formed between the lining material and the drum inner peripheral surface. Yes.

JP 2007-262454 A Japanese Patent Laid-Open No. 7-124458 JP 2000-236787 A

  By the way, in the above conventional drum type granulator, in consideration of the restriction of the size of the available rubber liner and the ease of mounting, a plurality of rectangular rubber liners 3 are provided as shown in FIG. Are generally attached to the inner peripheral surface 2 of the rotary drum 1 in a circumferential direction. In this case, a plurality of plate-like fixing members 4 (pressing plates) are arranged at predetermined intervals in parallel to the longitudinal direction of the rotating drum 1, and the fixing members 4 are used to form a plurality of rubber liners 3. The joint at the circumferential end is fixed to the inner peripheral surface 2 of the rotating drum 1. Specifically, as shown in FIG. 2, the joint 5 a between the two rubber liners 3 adjacent to each other is sandwiched between the fixing member 4 and the inner peripheral surface 2 of the rotating drum 1, and the bolt 5 The fixing member 4 is fixed to the rotary drum 1 with the nut 6. The fixed member 4 also functions as a lifter for scraping upward the raw material (not shown) staying at the bottom of the rotary drum 1 when the rotary drum 1 is rotated. In order to control the raising amount, the height (plate thickness) and width of the fixing member 4 are set to appropriate dimensions.

  However, the fixing member 4 for fixing the rubber liner 3 is exposed in a state of protruding toward the inner side of the rotating drum 1. For this reason, when a highly adherent raw material is granulated in the drum type granulator, the raw material gradually adheres to the fixing member 4 as shown in FIG. There was a problem of being formed. For example, in a drum granulator used in a pretreatment process of a sintered raw material, when a sintered raw material having very strong adhesion is used, the sintered raw material adheres strongly to the fixed member 4, and stable rolling In order to perform granulation, it was not sufficient to prevent adhesion with the rubber liner 3 alone.

  In detail, an iron plate or a rubber plate is generally used as the fixing member 4. However, since the fixing member 4 is fastened and fixed by a bolt 5 or the like, the elasticity is small, and the rotating drum 1 rotates. Is hardly deformed. For this reason, when a raw material with high adhesiveness is used, the fixing of the raw material to the fixing member 4 becomes intense, and a large fixed object 7 is formed around the fixing member 4, and the fixed object 7 is rotated by the rotating drum 1. Will not fall. Then, the fixed material 7 thus formed around the fixing member 4 increases the amount of raw material scraped and the height of the raw material, so that the raw material cannot be properly rolled and granulated. That is, in order to perform proper rolling granulation, it is required to smoothly roll the raw material by scraping up an appropriate amount of the raw material to an appropriate height in the rotary drum 1 using a lifter. However, when the raw material in the rotary drum 1 is scraped up to a position higher than necessary by the fixed matter 7, the raw material falls all the way from the high position to the bottom of the drum, and the existing granulated material is destroyed. As a result, proper rolling granulation is hindered. In addition, when the fixed material 7 that grows very large is peeled off, the large lump is discharged from the granulator, which may cause problems such as being unable to be put into the sintering machine as it is.

  From the circumstances described above, conventionally, in a drum type granulator, not only the adhesion of the raw material to the inner peripheral surface of the rotating drum but also the prevention of the adhesion of the raw material to the fixing member for fixing the rubber liner is preferably prevented. There has been a demand for a method capable of appropriately rolling and granulating raw materials in a drum.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to prevent the adhesion of raw materials to a fixing member for fixing a rubber liner and to stabilize proper rolling granulation. It is an object of the present invention to provide a new and improved drum granulator and granulation method that can be realized in a practical manner.

  In order to solve the above-described problem, according to an aspect of the present invention, the circumferential direction of the rotating drum is formed of a cylindrical rotating drum and a rectangular rubber sheet, and covers the entire inner peripheral surface of the rotating drum. And a plurality of fixing members that fix the rubber liner to the inner peripheral surface of the rotating drum, and the fixing members are adjacent to each other in the circumferential direction. A joint margin of the rubber liner, which is arranged in parallel to the longitudinal direction of the rotating drum along the seam of the rubber liner and is adjacent to the circumferential direction, is formed between the inner peripheral surface of the rotating drum. The rubber drum is fixed to the inner peripheral surface of the rotating drum so as to be sandwiched, and at the joint of the rubber liners adjacent to each other in the circumferential direction, the joint margin of at least one rubber liner covers the fixing member so as to be caught. Characterized the door, a drum granulator is provided.

  With such a configuration, since the joint of at least one rubber liner covers the joint of the rubber liner so as to entrain the fixing member, it is possible to prevent the granulated material from adhering to the fixing member in the rotating drum. Further, each rubber liner is attached to the inner peripheral surface of the rotating drum such that both ends in the circumferential direction of each rubber liner are sandwiched between the fixing member and the inner peripheral surface of the rotating drum. For this reason, when each rubber liner moves upward in the drum as the rotary drum rotates, the rubber liner is deformed into a convex cross section toward the inner side of the rotary drum. Can be removed.

  Moreover, the part which covers the said fixing member among the joint margins of the said rubber liner is not being fixed to the said fixing member, but can also be made to contact / separate with respect to the said fixing member. Thereby, the part which covers a fixing member among the joint margins of the circumferential direction edge part of a rubber liner has a play, Therefore It contacts or separates with respect to a fixing member with rotation of a rotating drum. For this reason, the to-be-granulated material adhering to the said part can be made to detach | leave suitably, and a fixed substance cannot adhere to the said part easily.

  In addition, one fixing member is installed for each joint of the rubber liners adjacent to each other in the circumferential direction, and in the joint of the rubber liners adjacent to each other in the circumferential direction, the joint margin of one rubber liner is: It is arranged along the inner peripheral surface of the rotating drum, and the joint margin of the other rubber liner covers the fixing member so as to be wound, and the tip portion of the joint margin of the rubber liner adjacent to the circumferential direction is They may be arranged so as to overlap each other, and may be sandwiched between the one fixing member and the inner peripheral surface of the rotating drum and fixed to the inner peripheral surface of the rotating drum. Accordingly, the seam of the rubber liners adjacent to each other in the circumferential direction can be suitably fixed to the rotating drum using one fixing member, and the fixing member is appropriately covered with the seam allowance of the other rubber liner. Can do.

  Further, the one rubber liner is a rubber liner disposed on the rotating direction side of the rotating drum, and the other rubber liner is a rubber liner disposed on the rotating direction opposite side of the rotating drum, The granulated material in the rotating drum may be scraped up by the fixing member covered by the joint margin of the other rubber liner. Thereby, the fixing member covered by the joint margin of the rubber liner disposed on the opposite side in the rotation direction can function as a lifter, and the granulated material in the rotating drum can be scraped and rolled. Further, by adjusting the radial height (lifter height) of the rotating drum of the fixed member, the scraping amount and the scraping height of the granulated material can be controlled to appropriate values.

  Furthermore, you may make it change the rotation direction of the said rotating drum according to the adhesiveness of the said granulated material. As a result, when the adherence of the granulated material is high, the rotation direction of the rotating drum is reversed so that the fixing member covered by the joint margin of the rubber liner does not function as a lifter and is scraped up. The amount and scraping height can be adjusted.

  Further, two fixing members are juxtaposed for each joint of the rubber liners adjacent to each other in the circumferential direction, and at the joint of the rubber liners adjacent to each other in the circumferential direction, The joint of the other rubber liner is disposed so as to come into contact with each other between the two fixing members, and the joint of the one rubber liner is connected to one of the two fixing members. A fixing member is covered so that the tip end portion of the joint is sandwiched between the one fixing member and the inner peripheral surface of the rotating drum and fixed to the inner peripheral surface of the rotating drum. The seam allowance of the rubber liner covers the other fixing member of the two fixing members so that the tip of the seam allowance is between the other fixing member and the inner peripheral surface of the rotating drum. The rotating drum is sandwiched between It may be fixed to an inner circumferential surface of the. Accordingly, the seams of the rubber liners adjacent to each other in the circumferential direction can be suitably fixed to the rotating drum using the two fixing members, and the two fixing members are appropriately used at the joints of the respective rubber liners. Can be covered.

  Furthermore, the radial height of the rotating drum of the one fixing member and the radial height of the rotating drum of the other fixing member may be the same. This eliminates a step between one fixing member covered by the joint of one rubber liner and the other fixing member covered by the joint of the other rubber liner, and adjacent rubber liners in the circumferential direction. The top surface of the seam can be substantially flush. Therefore, when the adherence of the granulated material is high, the lifter function at the joint can be greatly weakened, and the amount of the granulated material scraped up by the lifter can be greatly reduced.

  Further, the one rubber liner is a rubber liner disposed on the rotating direction side of the rotating drum, and the other rubber liner is a rubber liner disposed on the rotating direction opposite side of the rotating drum, The height of the other fixing member in the radial direction of the rotating drum is higher than the height of the one fixing member in the radial direction of the rotating drum, and the other fixing member is covered by the joint margin of the other rubber liner. The granulated material in the rotating drum may be scraped up by a step between the member and the one fixing member covered by the joint margin of the one rubber liner. Thereby, the said level | step difference can be functioned as a lifter, and the to-be-granulated material in a rotating drum can be raked up and it can be rolled. Further, by adjusting the difference in height (lifter height) between the two fixing members, it is possible to control the scraping amount and scraping height of the granulated material to appropriate values.

  In order to solve the above problems, according to an aspect of the present invention, there is provided a granulation method for granulating a granulated material using the drum type granulator, wherein the rotary drum is rotated to When granulating the material to be granulated, each rubber liner attached to the inner peripheral surface of the rotating drum by a fixing member moves upward along with the rotation of the rotating drum. The granulation method is characterized in that the granulated material adhering to the rubber liner is released by being deformed into a convex cross section toward the surface.

  As described above, according to the present invention, it is possible to prevent the raw material from adhering to the fixing member that fixes the rubber liner, and to realize proper rolling granulation stably.

It is sectional drawing which shows the attachment structure of the rubber liner of the conventional drum type granulator. It is the elements on larger scale of the rotating drum bottom part of FIG. It is the elements on larger scale which show the state which the fixed material of the raw material adhered to the fixing member of FIG. It is a mimetic diagram showing the sintering equipment provided with the drum type granulator concerning a 1st embodiment of the present invention. It is a partially cutaway perspective view showing the drum type granulator according to the same embodiment. It is a partial expanded sectional view which shows the attachment structure (drum bottom part) of the rubber liner which concerns on the same embodiment. It is a partial expanded sectional view which shows the attachment structure (drum upper part) of the rubber liner which concerns on the same embodiment. It is a partial expanded sectional view which shows the attachment structure (drum bottom part) of the rubber liner which concerns on the example of a change of the embodiment. It is a partial expanded sectional view which shows the attachment structure (drum bottom part) of the rubber liner which concerns on the 2nd Embodiment of this invention. It is a partial expanded sectional view which shows the attachment structure (drum bottom part) of the rubber liner which concerns on the example of a change of the embodiment. It is a partially notched perspective view which shows the whole structure of the drum type granulator which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the whole structure of the drum type granulator which concerns on the same embodiment. It is a perspective view which shows the state which joined the rubber liner to the longitudinal direction and circumferential direction of the rotating drum which concerns on the same embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. First Embodiment>
[1.1. Overall configuration of sintering equipment]
First, with reference to FIG. 4, the whole structure of the sintering equipment to which the drum type granulator according to the first embodiment of the present invention is applied will be described. FIG. 4 is a schematic diagram showing the overall configuration of a sintering facility to which the drum granulator according to this embodiment is applied.

  As shown in FIG. 4, the sintering facility according to this embodiment mainly includes a pseudo granulation line 20, a pellet granulation line 30, and a sintering machine 40. The pellet granulation line 30 is a production line for producing a granulated product (hereinafter referred to as “sintered raw material pellet”) obtained by granulating an iron ore raw material mainly composed of fine powder. On the other hand, the pseudo granulation line 20 granulates an iron ore raw material containing fine powder and coarse particles, and a granulated product in which the fine powder is adhered to the coarse particles serving as core particles (hereinafter referred to as “pseudo granulated product”). It is a manufacturing line for manufacturing.

  Here, the iron ore raw material for manufacturing the said sintered raw material pellet and pseudo granulated material is demonstrated first. The iron ore raw material is used as a sintering raw material for producing the sintered ore with the sintering machine 40. This sintered raw material is, for example, iron ore raw material, which is the main raw material, as an auxiliary raw material, iron making dust (blast furnace dust collecting dust, converter dust etc.), pellet feed, limestone, dolomite, silica stone, olivine, coke powder, The mixed raw material which added 1 type, or 2 or more types, such as anthracite, can be used. The iron ore raw material is not limited as long as it is an iron ore used as a normal sintering raw material. For example, iron ore containing a large amount of crystal water in addition to hematite or magnetite (for example, goethite, limonite (pisolite ore) Etc.), and may be porous (for example, maramamba ore, high phosphorus block man ore, etc.).

  Since the iron ore raw material containing a lot of these fine powders has poor granulation properties and the strength of the granulated material is low, the granulated material is not contained in the conveying process up to the sintering machine 40 or the sintering process in the sintering machine 40. Collapse phenomenon occurs. For this reason, when an iron ore raw material containing a large amount of such fine powder is directly introduced into the sintering machine 40, the air permeability is greatly deteriorated and the productivity of the sintered ore is hindered. Therefore, it is necessary to increase the strength of the granulated material by subjecting the iron ore raw material to a granulation treatment described later.

  The binder added to the kneader is, for example, a polyacrylic acid-based dispersant (for promoting solid crosslinking, such as an aqueous solution or a colloid added with a dispersant, from the viewpoint of enhancing granulation properties. At least one of quick lime and lignin.

  The iron ore raw materials as described above are classified according to the ore type and particle size, and granulated (pseudo-particle or pelletized) by two types of granulation lines, the pseudo-granulation line 20 and the pellet granulation line 30, respectively. Thus, sintered raw material pellets and pseudo-granulated products are produced. Each granulation line is described in detail below.

  First, the pseudo granulation line 20 will be described in detail. The pseudo-granulation line 20 is a line for manufacturing a pseudo-granulated product in which fine particles (for example, a particle size of 250 μm or less) are adhered to coarse particles (for example, a particle size of 3 mm or more) of an iron ore raw material serving as core particles. As shown in FIG. 4, the pseudo granulation line 20 includes a raw material tank 21 for storing a sintering raw material including coarse particles and fine powder, a sieve sorter 22, and a kneading for kneading the sintering raw material with a water-soluble binder or the like. And a granulator 24 that granulates the kneaded sintered raw material to produce a pseudo-granulated product.

  The raw material tank 21 stores, for example, iron ore containing coarse particles and fine powder (for example, pisolite ore), iron ore raw material containing powdered coke, limestone, and the like. It is sorted into coarse particles having a predetermined particle size or more (for example, 3 mm or more) and fine particles having a particle size smaller than that. Of these, the coarse particles can be used as core particles as they are, and are therefore conveyed to the granulator 24. On the other hand, the fine powder is charged into a kneader 23 composed of, for example, a Redige mixer and kneaded together with a binder to produce a kneaded product. As the kneading machine 23, for example, a blade rotation type kneading machine such as a pro shear mixer or an Eirich mixer can be used.

  The kneaded product obtained by the kneader 23 and the coarse particles from the sieve sorter 22 are charged into the granulator 24. For example, a drum-type granulator (also referred to as a drum mixer) can be used as the granulator 24, and the kneaded material of the iron ore raw material is granulated (pseudo-particle) by the granulator 24. It becomes a thing. Specifically, fine particles (for example, a particle size of 250 μm or less) contained in the powder coke, other iron ore, and binder are adhered around the core particles that are coarse particles by the granulation treatment by the granulator 24. A pseudo granulated product (for example, a particle size of 1 to 10 mm) is produced.

  Next, the pellet granulation line 30 will be described in detail. The pellet granulation line 30 is a line for producing sintered raw material pellets, which are granulated products obtained by granulating an iron ore raw material mainly composed of fine powder having a predetermined particle size or less. The iron ore raw material mainly composed of fine powder is, for example, an iron ore raw material containing 60% by mass or more of particles having a particle size of 250 μm or less. The sintered raw material pellet is, for example, a granulated product having a particle size of 1 to 10 mm and an average particle size of 5 mm. In the present embodiment, for example, particles having a particle size of 3 mm or more are 70% by mass or more and particles having a particle size of less than 3 mm. Is a granulated product containing less than 30% by mass.

  As shown in FIG. 4, the pellet granulation line 30 includes a raw material tank 31 for storing iron ore raw materials mainly composed of fine powder, a sieve sorter 32, a pulverizer 33 for pulverizing the iron ore raw materials, and pulverization. A granulated machine 34 for kneading the later sintered raw material and a binder, a granulator 35 for granulating the kneaded sintered raw material to produce a sintered raw material pellet, a sieve sorter 36, and granulated A dryer 37 for drying the sintered raw material pellets.

  In the raw material tank 31 of the pellet granulation line 30, various iron ore raw materials (for example, maramamba ore, high phosphorus block man ore, etc.) containing a large amount of fine powder, fine powder raw materials such as the above iron making dust, pellet feed, limestone, etc. A sintering raw material containing a binder such as is stored. As this iron ore, coarse particles having a predetermined particle diameter or more are selected and removed in advance by a sieve sorter (not shown) or the like to obtain a fine powder (for example, particle diameter of 3 mm or less). It is preferable from the viewpoint of facilitating and developing the strength of the granulated product.

  The iron ore raw material supplied from the raw material tank 31 is first sieved by a sieve sorter 32, and fine powder having a predetermined particle size (for example, 3 mm) or less is supplied to a pulverizer 33. On the other hand, the particles having a predetermined particle diameter or more are supplied to the granulator 24 of the pseudo-granulation line 20 to be used as the core particles of the above-described pseudo-granulated product. The pulverizer 33 is composed of, for example, a roller press compressor, a ball mill, or the like, and pulverizes the iron ore material that has been charged into a predetermined particle size distribution. Thus, the subsequent granulation process can be facilitated by pulverizing and finely pulverizing and sizing the iron ore raw material.

  Next, in the kneader 34, the binder and water are added to adjust the water content, and then the fine iron ore raw material is kneaded. As the kneading machine 34, for example, a blade rotation type kneading machine such as a Redige mixer or a Proshear mixer can be used. In this way, the kneading machine 34 is installed in the previous stage of the granulator 35, so that the kneading ability of the iron ore raw material and the binder is enhanced.

  The sintered raw material after being kneaded by the kneader 34 is charged into the granulator 35 and granulated. As the granulator 35, for example, a drum granulator can be used. By the granulation by the granulator 35, for example, sintered raw material pellets which are substantially spherical granules having a particle diameter of 1 to 10 mm, preferably 3 to 6 mm (for example, an average particle diameter of 5 mm) are manufactured. . The particle size distribution of the sintered raw material pellets may be, for example, a particle size of 3 mm or more being 70% by mass or more and a particle size of 3 mm or less being less than 30% by mass.

  The sintered raw material pellets thus produced are dried by a dryer 37 after a granulated material having a predetermined particle size or more is sorted by a sieve sorter 36.

  As described above, the pseudo-granulated product granulated in the pseudo-granulation line 20 and the sintered raw material pellets granulated in the pellet granulation line 30 are blended at a predetermined blending ratio, and the sintering machine 40. The sintering machine 40 sinters the two kinds of sintered raw material granules to produce a sintered ore. The sintered ore is supplied to the blast furnace after being crushed by a crusher (not shown) and cooled by a sintered cooler (not shown).

  The overall configuration of the sintering facility according to the present embodiment has been described above. In this embodiment, granulators 24 and 35 are installed in the pseudo granulation line 20 and the pellet granulation line 30, respectively, and the iron ore raw material is granulated (pseudo particles or pelletized). The present embodiment is characterized by the configuration of the granulators 24 and 35 and the granulation method using the granulator, and the features will be described in detail below.

[1.2. Overall structure of granulator]
Next, with reference to FIG. 5, the whole structure of the drum type granulator 10 which concerns on this embodiment is demonstrated. FIG. 5 is a partially cutaway perspective view showing the drum granulator 10 according to the present embodiment. The drum granulator 10 according to the present embodiment shown in FIG. 5 is provided in the granulators 24 and 35 provided in the pseudo granulation line 20 and the pellet granulation line 30 of the sintering equipment shown in FIG. Applicable.

  As shown in FIG. 5, the drum type granulator 10 according to this embodiment is a rotating container type rolling granulator that rolls and granulates a granulated material in a cylindrical rotating drum 11. The drum granulator 10 includes a rotating drum 11 that is a cylindrical drum body, a transport mechanism 16 such as a belt conveyor that transports a raw material M that is a granulated material, and a rotating drum 11 that is centered on a rotation axis A. A rotation drive mechanism (not shown) for rotation.

  The rotating drum 11 is a drum-type container having a cylindrical shape with a diameter of 1 to 5 m and a length of 5 to 25 m, for example. The rotary drum 11 is inclined so that the raw material inlet side is higher than the outlet side, and the inclination angle θ of the rotation axis A with respect to the horizontal line is, for example, θ = 3 to 10 °.

  At the time of granulation by the drum type granulator 10 having such a configuration, the raw material M is fed to one side of the rotary drum 11 by the transport mechanism 16 while the rotary drum 11 is rotated at a predetermined speed (for example, 6.8 rpm) by the rotation driving mechanism. Insert into the inside through the inlet. Then, the raw material M charged into the rotating drum 11 gradually moves from the charging port side of the inclined rotating drum 11 to the other side discharging port while rolling in the rotating drum 11. Thereby, the raw material M is rolled and granulated in the rotating drum 11, and the granulated material with a predetermined particle size (for example, several mm) or more is manufactured.

  In the granulation process of the drum type granulator 10 as described above, the raw material M is prevented from adhering to the inner peripheral surface 12 of the rotating drum 11 so that proper rolling granulation of the raw material M is not hindered. This is very important. Therefore, a rubber liner 13 is attached to the inner peripheral surface 12 of the rotating drum 11 as a lining material for preventing the material M from adhering. The rubber liner 13 covers the entire inner peripheral surface 12 of the rotating drum 11 (hereinafter referred to as the drum inner peripheral surface 12), prevents the material M from adhering to the rotating drum 11, and prevents corrosion of the rotating drum 11. Abrasion can be prevented.

  The rubber liner 13 is a lining material made of a rectangular rubber sheet, and the material thereof is rubber such as natural rubber or synthetic rubber, and has elasticity and flexibility. In the present embodiment, as a physical property, for example, a rubber liner 13 having a hardness (JIS-A) of 37 to 40 °, an elongation of 740 to 810%, and a tensile strength of 21 to 26.6 MPa is used. Moreover, from the production size and elastic deflection amount of a commercially available rubber liner 13, for example, a strip-shaped rubber liner 13 having a width of 0.3 to 1.5 m and a length of 2 to 10 m is used.

  Generally, the rotary drum 11 of the drum type granulator 10 used for granulation of iron ore raw material has a diameter of 1 to 5 m and a length of 5 to 25 m. Therefore, the entire drum inner peripheral surface 12 is covered with a single rubber liner 13. Cannot be covered. Therefore, in this embodiment, a plurality of rubber liners 13 are joined together in the circumferential direction so as to cover the entire drum inner peripheral surface 12. For example, as shown in FIG. 5, the rubber liner 13 divided into eight in the circumferential direction of the rotating drum 11 is joined together, and the entire inner peripheral surface 12 of the drum is covered with the eight rubber liners 13. For this reason, a seam 18 extending in the longitudinal direction of the rotating drum 11 (direction of the rotation axis A) is formed between the rubber liners 13 adjacent to each other in the circumferential direction of the rotating drum 11.

  The rubber liner 13 as described above is attached to the drum inner peripheral surface 12 by a fixing member (presser plate) called a lifter. This fixing member fixes the seam of the end portion in the circumferential direction of the rubber liner 13 to the drum inner peripheral surface 12 at the joint 18 between the rubber liners 13 and 13 adjacent to each other in the circumferential direction (see FIG. 6). The drum type granulator 10 according to the present embodiment has a feature in the mounting structure of the rubber liner 13 and prevents the raw material from adhering to the fixing member by covering the fixing member with the rubber liner 13. Below, the attachment structure of the rubber liner 13 which is the characteristic which concerns on this embodiment is explained in full detail.

[1.3. Rubber liner mounting structure]
Next, with reference to FIG.6 and FIG.7, the attachment structure of the rubber liner 13 of the drum type granulator 10 which concerns on this embodiment is demonstrated. 6 and 7 are partially enlarged cross-sectional views showing the attachment structure of the rubber liner 13 according to this embodiment. FIG. 6 shows the attachment state at the bottom of the rotating drum 11 and FIG.

  In the conventional mounting structure described above, as shown in FIGS. 1 and 2, a plurality of rubber liners 3 are divided in the circumferential direction, and the circumferences of two rubber liners 3 adjacent to each other in the circumferential direction are arranged. The joint margin 3a at the end portion in the direction is simply overlapped and fixed between the upper portion of the joint 3a and the inner peripheral surface 2 of the rotary drum 1 by the fixing member 4. However, in the conventional mounting structure, since the fixing member 4 is exposed, there is a problem that the raw material is fixed to the fixing member 4 and a large fixed object 7 is formed as shown in FIG. .

  Therefore, in the structure for attaching the rubber liner 13 according to the present embodiment, as shown in FIGS. 6 and 7, in order to prevent the raw material from sticking to the fixing member 14, one rubber is provided at the joint 18 of the rubber liners 13 and 13. A seam allowance 13 a at the circumferential end of the liner 13 is disposed so as to cover the fixing member 14 from inside the rotating drum 11.

  The mounting structure of the rubber liner 13 will be described in detail. As shown in FIGS. 6 and 7, one fixing member 14 is installed for each joint 18 of the rubber liners 13 and 13 adjacent to each other in the circumferential direction of the rotary drum 11. The fixing member 14 is, for example, a plate member (pressing plate) having a rectangular cross section, and extends in the longitudinal direction (rotation axis A direction) of the rotary drum 11 along the seam 18 of the adjacent rubber liners 13 and 13. Installed.

  And in the joint 18 of the rubber liners 13 and 13 adjacent to each other, the tip end portions 13b of the joint margins 13a at the circumferential ends of the two rubber liners 13 and 13 are disposed so as to overlap each other. Here, the joint allowance 13a of the rubber liner 13 is a belt-like portion necessary for joining the plurality of rubber liners 13 in the circumferential direction, and is formed at the side portions at both ends in the width direction of the rectangular sheet-like rubber liner 13. Equivalent to. The tip portion 13 b is a band-like portion at the tip of the joint allowance 13 a and is a portion sandwiched between the fixing members 14.

  The fixing member 14 is disposed so as to sandwich the tip end portion 13b of the joint margin 13a of the two overlapped rubber liners 13 with the drum inner peripheral surface 12. The fixing member 14 is screwed to the rotating drum 11 by a bolt 15 attached from the outside of the rotating drum 11 with the tip 13b of the joint 13a of the two rubber liners 13 interposed therebetween. For this screwing, a screw hole 14 a that is screwed into the bolt 15 is formed inside the fixing member 14. By fastening the bolts 15 to the screw holes 14a of the fixing member 14, each rubber liner 13 is fixed to the drum inner peripheral surface 12 with the joint margins 13a at both ends in the circumferential direction sandwiched therebetween. By fixing the rubber liner 13 and the fixing member 14 to the rotating drum 11 in this way, it is not necessary to project a bolt or a nut on the upper surface of the fixing member 14 (that is, the covering surface by the rubber liner 13). The fixing member 14 can be easily covered with the liner 13.

  Furthermore, in the attachment structure according to the present embodiment, at the joint 18 between the rubber liners 13 and 13 adjacent to each other in the circumferential direction, the joint allowance 13a of one rubber liner 13 (the rubber liner 13 on the rotational direction side) is the inner circumference of the drum. Arranged along the surface 12. On the other hand, the seam allowance 13a of the other rubber liner 13 (rubber liner 13 on the opposite side in the rotational direction) is arranged so as to wind the fixing member 14 from the inside of the rotary drum 11 and cover it. The joint margin 13a of the other rubber liner 13 is sandwiched between the fixing member 14 and the rotating drum 11 with the tip end 13b sandwiching the tip end portion 13b in the rotation direction, and the drum inner peripheral surface 12 However, the joint allowance 13a (the portion covering the fixing member 14) other than the tip end portion 13b is not fixed to the fixing member 14 and is in contact with or separated (contact / separated). ) Is possible. In the example of FIG. 6, the seam allowance 13 a of the rubber liner 13 covering the fixing member 14 has a substantially U-shaped cross section. Of the U-shaped portion of the seam allowance 13 a, Portions adjacent to the side surface and the upper surface are not fixed to the fixing member 14 and can be brought into and out of contact with the fixing member 14.

  As described above, at the joint 18 between the rubber liners 13, the joint margin 13 a of the other rubber liner 13 covers the fixing member 14 so as to prevent the raw material from coming into contact with the fixing member 14. Therefore, it is possible to reliably prevent the raw material from adhering to the fixing member 14 where the raw material easily adheres in terms of material and shape during granulation. Further, the tip portions 13b of both the rubber liners 13 in the seam 18 are sandwiched between the fixing member 14 and the drum inner peripheral surface 12 in a state of being in close contact with each other, and the raw material is inserted between the tip portions 13b. There is no invasion.

  Moreover, at the time of granulation, the rubber liner 13 located at the bottom of the rotary drum 11 as shown in FIG. 6 is positioned at the top of the rotary drum 11 as shown in FIG. 7 as the rotary drum 11 rotates. . Then, as shown in FIG. 7, the circumferential central portion 13 c of the elastic rubber liner 13 is separated from the rotating drum 11 due to its own weight and the weight of the adhering matter, and directed toward the inside of the rotating drum 11. It is deformed so as to be convex (that is, bent downward), and a gap 17 is formed between the drum inner peripheral surface 12 and the rubber liner 13. For this reason, since the raw material adhering to the center part 13c of the rubber liner 13 leaves | separates from the said center part 13c, and falls, the adhesion of the raw material with respect to the center part 13c of the rubber liner 13 can be prevented reliably. Further, when the rubber liner 13 having more flexibility is used, the rubber liner 13 can be bent downward before reaching the vertical direction of the rotary drum 11, so that it is more efficient. Deposits can be dropped.

  Further, when the rubber liner 13 moves to the upper part of the rotating drum 11, the joint 13a of the rubber liner 13 covering the fixing member 14 also deforms the central portion 13c at the joint 18 at both ends of the rubber liner 13. Accordingly, it is deformed downward and is separated from the fixing member 14, and a gap 19 is formed between the fixing member 14 and the joint allowance 13a. That is, the joint 13 a of the rubber liner 13 covering the fixing member 14 is brought into contact with and separated from the fixing member 14 as the rotating drum 11 rotates. Thereby, the raw material adhering to the joint margin 13a of the rubber liner 13 around the fixing member 14 is also detached from the joint margin 13a when the joint margin 13a moves above the rotary drum 11 or before that. Fall. Accordingly, even at the joints 18 of the rubber liners 13 and 13 adjacent to each other in the circumferential direction, the adhesion of the raw material to the joint 13a of the rubber liner 13 around the fixing member 14 can be reliably prevented. 7 problem can be solved.

  As described above, according to the mounting structure of the rubber liner 13 according to the present embodiment, it is possible to reliably prevent the raw material from adhering to the fixing member 14, and not only the central portion 13 c of each rubber liner 13 but also the rubber liner 13. Also at the joints 18 at both ends, the adhesion of the raw material can be suitably prevented. Therefore, since the fixed material of the raw material does not grow greatly in any part of the rubber liner 13, the raw material is not scraped up to an excessively high position by the fixed material in the rotary drum 11. Therefore, it is possible to stably produce a granulated product having an appropriate particle size by suitably performing rolling granulation.

  Furthermore, the lifter function in the mounting structure of the rubber liner 13 will be described. As described above, in the joint 18 between the rubber liners 13 and 13, the joint 13a of the rubber liner 13 on the opposite side in the rotational direction covers the fixing member 14, and the joint 13a of the rubber liner 13 on the rotational direction side is It is arranged along the drum inner peripheral surface 12 below. For this reason, the fixing member 14 covered with the joint 13a of the rubber liner 13 on the opposite side in the rotational direction protrudes toward the inside of the rotary drum 11 from the joint 13a of the rubber liner 13 on the rotational direction. That is, the radial step H of the rotary drum 11 is between the fixing member 14 covered with the joint 13a of the rubber liner 13 on the opposite side in the rotational direction and the joint 13a of the rubber liner 13 on the rotational direction. The step H is substantially equal to the sum of the height h (lifter height) of the fixing member 14 and the thickness of the two rubber liners 13.

  The step H functions as a lifter for scooping up the raw material (not shown) staying at the bottom of the rotating drum 11 when the rotating drum 11 rotates. In order to control the scraping amount of the raw material at this time, the height h and the width of the fixing member 14 are set to appropriate dimensions. For example, the fixing member 14 may be a plate material having a width of 100 mm and a height of 12 mm, and the raw material may be scraped up from the bottom of the rotary drum 11 within a range of a rotation angle of 90 ° or less. The height h of the fixing member 14 is the radial height of the rotating drum 11 of the fixing member 14 attached to the rotating drum 11. For example, in the case of a plate-like fixing member 14 having a rectangular cross section, That is the thickness.

  As described above, by setting the height h and width of the fixing member 14 to appropriate dimensions, an appropriate amount of raw material can be appropriately produced in the rotary drum 11 by the step H at the joint 18 of the rubber liners 13 and 13. Can be scraped to a certain height. Therefore, the raw material can be suitably rolled and granulated in the rotary drum 11. As described above, since the step H, which is an important granulation condition, can be maintained in a state in which the disturbance of adhesion of raw materials is eliminated, an appropriate granulated product can be obtained.

  In addition, since the adhesion of the raw material is very strong, the rotational direction of the rotary drum 11 may be reversed when it is desired to reduce the scraping by the lifter as much as possible and perform rolling granulation. Thereby, since the raw material is not scraped up by the level difference H of the joint 18 of the rubber liners 13 and 13, the raw material can be scraped and rolled and granulated depending only on the adhesiveness of the raw material. As described above, the drum type granulator 10 according to the present embodiment changes various types of rotation by changing the rotation direction of the rotating drum 11 in the forward and reverse directions according to the adhesion strength of the raw material to be granulated. The raw material can be appropriately rolled and granulated.

[1.4. Modified example of rubber liner mounting structure]
Next, with reference to FIG. 8, the attachment structure of the rubber liner 13 which concerns on the example of a change of this embodiment is demonstrated. FIG. 8 is a partially enlarged cross-sectional view showing a mounting structure (drum bottom) of the rubber liner 13 according to a modified example of the present embodiment.

  6 and 7, the plate-like fixing member 14 having a rectangular cross section is used. In the example of FIG. 8, a round bar-like fixing member 14 having a circular cross section is used. As shown in FIG. 8, at the joints 18 of the rubber liners 13 and 13 adjacent to each other in the circumferential direction of the rotary drum 11, the tip portions 13b of the joints 13a of both rubber liners 13 are overlapped with each other to fix them in a round bar shape. It is sandwiched between the member 14 and the drum inner peripheral surface 12 and fixed. Similarly to the above, the round rod-shaped fixing member 14 is formed with a screw hole 14a to be screwed with the bolt 15. The bolt 15 is connected from the outside of the rotating drum 11, and the rotating drum 11 and the two rubber liners 13 are connected. The fixing member 14 is screwed to the rotating drum 11 by being penetrated and fastened to the fixing member 14.

  Further, in the joint 18 between the two rubber liners 13, 13, the seam 13 a of the rubber liner 13 on the opposite side in the rotational direction is disposed so as to enclose and cover the round bar-shaped fixing member 14. Thereby, adhesion of the raw material to the round bar-shaped fixing member 14 can be prevented. Further, when the rotating drum 11 rotates and the rubber liner 13 moves to the upper part of the rotating drum 11, the rubber liner 13 bends downward as in FIG. The raw material adhering to the vicinity of the joint 18 can be suitably dropped.

  As described above, the rubber liner 13 mounting structure using the round bar-shaped fixing member 14 shown in FIG. 8 has the same effects as the case of using the rectangular cross-section fixing member 14 described in FIGS. Obtainable. The cross-sectional shape of the fixing member 14 is not limited to the rectangular and circular examples described above, and any shape such as a trapezoid, a triangle, other polygons, an ellipse, or a semicircle can be used.

<2. Second Embodiment>
Next, the attachment structure of the rubber liner 13 according to the second embodiment of the present invention will be described. The drum granulator according to the second embodiment is substantially the same as the functional configuration of the drum granulator 10 according to the first embodiment except for the mounting structure described below. Detailed description thereof will be omitted.

[2.1. Rubber liner mounting structure]
FIG. 9 is a partially enlarged cross-sectional view showing the rubber liner 13 mounting structure (drum bottom) according to the second embodiment of the present invention. The attachment structure shown in FIG. 9 is an example in which the lifter at the seam 18 of the rubber liner 13 is completely eliminated and the adhesion of the raw material is reduced as much as possible.

  As shown in FIG. 9, two fixing members 14 </ b> A and 14 </ b> B are arranged in parallel to the longitudinal direction of the rotating drum 11 for each joint 18 of the rubber liners 13 </ b> A and 13 </ b> B adjacent to each other in the circumferential direction of the rotating drum 11. Established. The fixing members 14A and 14B are rectangular cross-section plates having the same height h and width.

  The joint margin 13a at the circumferential end of the one rubber liner 13A is disposed so as to cover the one fixing member 14A from the inside of the rotary drum 11, and the tip of the joint 13a of the rubber liner 13A. 13 b is sandwiched and fixed between the fixing member 14 </ b> A and the drum inner peripheral surface 12. By fastening the bolt 15A to the fixing member 14A, the fixing member 14A is screwed to the rotating drum 11 in a state of being in close contact with the tip end portion 13b of the joint 13a of the rubber liner 13A.

  Similarly, the joint 13a at the circumferential end of the other rubber liner 13B is disposed so as to cover the other fixing member 14B from the inside of the rotary drum 11, and the tip of the joint 13a of the rubber liner 13B. The portion 13b is sandwiched and fixed between the fixing member 14B and the drum inner peripheral surface 12. By fastening the bolt 15B to the fixing member 14B, the fixing member 14B is screwed to the rotating drum 11 in a state of being in close contact with the tip end portion 13b of the joint 13a of the rubber liner 13B.

  As a result, in the joint 18 of the rubber liners 13A and 13B, the joint 13a of each rubber liner 13A and 13B has a substantially U-shaped cross-sectional shape so as to surround the three sides of the fixing members 14A and 14B. The tip portion 13 b is fixed to the rotating drum 11. Further, in the joint allowance 13a of the rubber liner 13A and the joint allowance 13a of the rubber liner 13B, the portion sandwiched between the two fixing members 14A and 14B is in close contact with each other and in surface contact. For this reason, the raw material does not enter from the joint 18 of the rubber liners 13A and 13B which are in close contact with each other.

  Further, since the height h of the fixing member 14A and the fixing member 14B is the same, the upper surfaces (surfaces inside the rotating drum 11) of the rubber liners 13A and 13B at the joint 18 are substantially flush and there is no step. . Thereby, the whole drum inner peripheral surface 12 can be coat | covered so that it may become a smooth lining surface, and the lifter function of fixing member 14A, 14B in the seam 18 can be eliminated.

  By attaching the rubber liner 13 as described above, it is possible to completely reduce the adhesion of the raw material at the joint 18 by eliminating the step at the joint 18 of the rubber liners 13A and 13B and weakening the lifter function. it can. Therefore, the inhibiting factor with respect to rolling granulation by scraping can be reduced to the limit. Such an attachment structure is very effective in the case where it is desired to reduce the raw material scraping function by the lifter as much as possible because the adhesion of the raw material is very strong. In this case, depending on only the adhesion of the raw material to the rubber liner 13, the raw material is scraped and rolling granulation is performed.

  Also, in the mounting structure shown in FIG. 9, the fixing members 14A and 14B are covered by the joint margins 13a of the rubber liners 13A and 13B, respectively, so that it is possible to prevent the raw material from adhering to the fixing members 14A and 14B. Further, when the rotating drum 11 rotates and the rubber liners 13A and 13B move to the upper part of the rotating drum 11, the rubber liners 13A and 13B are bent downward as in FIG. The raw material adhering to the central portion 13c of 13B and the joint margin 13a in the vicinity of the joint 18 can be suitably dropped.

[2.2. Modified example of rubber liner mounting structure]
Next, with reference to FIG. 10, the attachment structure of the rubber liner 13 which concerns on the example of a change of 2nd Embodiment is demonstrated. FIG. 10 is a partially enlarged cross-sectional view showing a mounting structure (drum bottom portion) of the rubber liner 13 according to a modified example of the present embodiment.

In the mounting structure shown in FIG. 10, in order to adjust the scraping amount of the raw material, the height (plate pressure) h _A and h _B of the two fixing members 14A and 14B is differentiated, and the rubber liners 13A and 13B This is an example in which a step H is provided at the joint 18.

Since the attachment structure of FIG. 10 is substantially the same as the attachment structure of FIG. 9 except that the heights of the fixing members 14A and 14B are different, the duplicated description is omitted. As shown in FIG. 10, at the joint 18 between the adjacent rubber liners 13A and 13B, the rubber liner 13B on the opposite side of the rotational direction is made higher than the height h _A of the fixing member 14A for fixing the rubber liner 13A on the rotational direction side. the higher the height _{h B} of the fixing member 14B to be fixed. As a result, the fixing member 14B covered with the joint 13a of the rubber liner 13B on the opposite side in the rotational direction is more inside the rotating drum 11 than the fixing member 14A covered with the joint 13a of the rubber liner 13A on the rotational direction. The step H is a difference (h _B −h _A ) between the height h of the fixing member 14B and the fixing member 14A.

The step H functions as a lifter for scooping up the raw material (not shown) staying at the bottom of the rotating drum 11 when the rotating drum 11 rotates. In order to control the scraping amount of the raw material at this time, the heights h _A and h _B of the fixing members 14A and 14B are set to appropriate dimensions. For example, since the adhesiveness of the raw material is low, the step H is increased when it is desired to increase the amount of the raw material scraped up by the step H. On the other hand, since the adherence of the raw material is high, when it is desired to reduce the amount of raw material scraped by the step H, the step H is reduced. In this way, by adjusting the heights of the steps H by changing the heights h _A and h _B of the fixing members 14A and 14B, the amount of the raw material scraped can be controlled to an appropriate value. Therefore, the raw material can be rolled and granulated appropriately by scraping the raw material with an appropriate amount of scraping according to the adhesiveness of the raw material.

<3. Third Embodiment>
Next, the attachment structure of the rubber liner 13 according to the third embodiment of the present invention will be described. The drum granulator according to the third embodiment is substantially the same as the functional configuration of the drum granulator 10 according to the first embodiment except for the mounting structure described below. Detailed description thereof will be omitted.

[3.1. Rubber liner mounting structure]
FIG. 11 is a partially cutaway perspective view showing the entire configuration of the drum granulator 10 according to the third embodiment of the present invention. FIG. 12 is a longitudinal sectional view showing the overall configuration of the drum granulator 10 according to the present embodiment. FIG. 13 is a perspective view showing a state where the rubber liner 13 is spliced in the longitudinal direction and the circumferential direction of the rotary drum 11 according to the present embodiment.

  As described above, the commercially available rubber liner 13 has, for example, a width of 0.3 to 1.5 m and a length of 2 to 10 m. Therefore, the longitudinal direction of the rotary drum 11 in the large drum granulator 10 is as follows. Is long (for example, 25 m), it may not be possible to cover the entire length of the rotating drum 11 with a single rubber liner 13. In such a case, as shown in FIGS. 11 and 12, in order to cover the entire drum inner peripheral surface 12, not only the circumferential direction of the rotating drum 11 but also a plurality of rubber liners 13 are joined in the longitudinal direction. Need to match. In the illustrated example, a plurality of rubber liners 13 are joined together by dividing the rotary drum 11 into eight parts in the circumferential direction and three parts in the longitudinal direction.

  When a plurality of rubber liners 13 are joined in the longitudinal direction of the rotating drum 11 in this way, the seam 51 is covered so that raw materials do not enter from the joints 51 of the rubber liners 13 and 13 adjacent to each other in the longitudinal direction. There is a need to. Therefore, in the present embodiment, as shown in FIGS. 11 to 13, a belt-like shape is formed over the entire circumference of the drum inner peripheral surface 12 with respect to the joint 51 of the rubber liners 13 and 13 adjacent to each other in the longitudinal direction of the rotary drum 11. A covering material 50 is attached so as to close the seam 51. The material of the band-shaped covering material 50 is preferably made of rubber similar to that of the rubber liner 13, but other materials can also be used.

  Further, if a single belt-like covering material 50 capable of covering the entire circumference of the drum inner peripheral surface 12 is used and bonded along the joint 51, the leakage of the raw material from the joint 51 can be reliably prevented. However, in this case, there is a drawback that the belt-shaped covering material 50 cannot be attached unless all the rubber liners 13 are attached to the drum inner peripheral surface 12. In order to solve this drawback, a band-shaped covering material 50 having a length approximately equal to the width of the rubber liner 13 is prepared in advance before the rubber liner 13 is attached, and one length direction of each rubber liner 13 is prepared. The band-shaped covering material 50 is adhered to the side end portion in a state where a part of the covering material 50 is left protruding. Then, when attaching the rubber liners 13, the individual rubber liners 13 are attached so that the seams 51 of the rubber liners 13, 13 adjacent in the longitudinal direction are covered with the belt-shaped covering material 50.

  For example, in the example of FIG. 13, a strip-shaped covering material 50 is bonded in advance to the end of the rubber liner 13C on the upstream side of the raw material flow. Then, after installing the rubber liner 13D on the downstream side of the raw material flow, the rubber liner 13C on the upstream side of the raw material flow is installed. At this time, in order to reliably prevent the intrusion of the raw material from the joint 51, it is preferable to adhere the strip-shaped covering material 50 protruding from the rubber liner 13C to the rubber liner 13D on the downstream side of the raw material flow. . However, after the raw material charged into the rotating drum 11 reaches the rubber liner 13D from the rubber liner 13C beyond the belt-shaped coating material 50, the belt-shaped coating material 50 and the rubber liner 13D Therefore, it is not necessary to adhere the belt-shaped coating material 50 to the rubber liner 13D.

  Heretofore, the attachment structure of the rubber liner 13 according to the third embodiment has been described. According to the present embodiment, since the single rubber liner 13 cannot be installed over the entire longitudinal direction of the rotary drum 11, even when a plurality of rubber liners 13 are joined together in the longitudinal direction, the seam 51 is formed. The belt-shaped covering material 50 can be suitably closed. Therefore, intrusion of the raw material from the joint 51 can be prevented appropriately.

  Next, a description will be given of experimental results obtained by performing granulation using the drum type granulator according to the embodiment of the present invention and observing the adhesion state of the raw material to the drum inner peripheral surface. The experimental conditions used in the following examples are illustrations for confirming the function of the rubber liner of the present invention as an adhesion preventing material, and the present invention is not limited to the following examples.

  First, as a comparative example of the present invention, a rubber liner 3 divided into nine in the circumferential direction with respect to the inner peripheral surface 2 of the rotary drum 1 of the drum type granulator is mounted according to the mounting structure shown in FIGS. An experiment was conducted in which the raw material was granulated using such a drum type granulator. As the rubber liner 3, two types of rubber liners (first and second rubber liners) having different physical property values were used.

  Further, as an example of the present invention, according to the first embodiment, a rubber liner 13 divided into nine in the circumferential direction with respect to the inner peripheral surface 12 of the rotary drum 11 of the drum type granulator is shown in FIGS. The experiment was conducted according to the mounting structure shown and granulating the raw material using such a drum type granulator. As the rubber liner 13, two types of rubber liners (first and second rubber liners) having different physical property values were used as in the comparative example.

The experimental conditions of the comparative example and the example are as follows.
Granulated material: Iron ore raw materials (Malabamba ore, high phosphorus block man ore, etc.)
Particle size distribution of iron ore material: 60% by mass or more of particles having a particle size of 250 μm or less Moisture content of iron ore material: 9% by mass at the time of granulation
Rotating drum: Diameter φ = 3m, length L = 10m, inclination θ = 7 °
Number of rotations of rotating drum: 6.8 rpm
Fixed member: Height 12mm, width 100mm, length 10m
First and second rubber liners: Rectangular rubber sheet made of natural rubber Dimensions of first and second rubber liners: Rubber thickness 6 mm, width 1.2 m, length 10 m
Physical property values of first rubber liner: Hardness (JIS-A) 37 °, elongation 810%, tensile strength 26.6 MPa
Physical property value of second rubber liner: Hardness (JIS-A) 40 °, elongation 740%, tensile strength 21 MPa

  First, experimental results according to the comparative example will be described. According to the comparative example, the raw material did not adhere to the surface of the rubber liner 3 with a problematic thickness, but the fixed material 7 adhered to the fixing member 4 (lifter portion) with a thickness of 50 mm or more. Smooth rolling granulation was inhibited.

  That is, the fixed matter 7 around the fixing member 4 becomes a weir protruding inside the drum, and during granulation, the raw material gets over the weir portion of the fixed matter 7 in accordance with the rotation of the rotary drum 1. Smooth rolling motion was inhibited. Furthermore, the amount of the raw material scraped and the height of the raw material are increased by the fixed matter 7 and the raw material scraped up more than necessary falls from a high position as the rotary drum 1 rotates. It will be destroyed.

  In addition, the solid material 7 that grew greatly peeled off without resisting its own weight, and a large mass was discharged from the drum granulator. In the sintering facility according to this comparative example, a crusher for large lumps is installed on the outlet side of the drum granulator, and the lumps of the fixed matter 7 are crushed and conveyed to the next process. Although the operation could be continued, there were problems such as the crushed material became fine and the granulated particle size could not be secured.

  Next, experimental results according to examples of the present invention will be described. According to the present embodiment, in both cases of the two types of rubber liners (first and second rubber sheets), the raw material adheres to the periphery of the fixing member 14 (lifter portion) covered with the rubber liner 13. Remarkably decreased. In the lifter part, as with the surface of the rubber liner 13 between the lifter parts, the adhesion of the raw material could be suppressed to a thin skin level (adhesion of 10 mm or less in thickness), and smooth rolling granulation could be performed. .

  Thus, in this example, since the large fixed matter 7 was not formed in the lifter part, it was possible to prevent the excessive raw material from being scraped up by the fixed matter 7. Moreover, the fall amount of the granulated material from the upper part in the rotating drum 11 could also be reduced, and the collapse by the fall of the granulated material could be suppressed. Therefore, the raw material can be appropriately rolled and granulated in the rotary drum 11, which greatly contributes to the improvement of the granulation quality.

[effect]
In the above, the drum type granulator 10 and its granulation method according to preferred embodiments and examples of the present invention have been described. According to the present embodiment, the fixing member 14 is wound around the joint 18 between the rubber liners 13 and 13 adjacent to each other in the circumferential direction of the rotary drum 11 by the joint 13a of the rubber liner 13 made of a material that hardly adheres to the raw material. cover. Thereby, since it is possible to prevent the fixing member 14 to which the raw material easily adheres in terms of material and shape in the rotating drum 11, it is possible to reliably prevent the raw material from adhering to the fixing member 14 at the joint 18. Furthermore, when each rubber liner 13 moves to the upper part in the drum as the rotating drum 11 rotates, the elastic rubber liner 13 is deformed so as to bend downward, so that the raw material adhered to the surface of the rubber liner 13 Can be dropped to remove deposits. Further, along with the deformation, the seam 18 of the rubber liner 13, 13 is also deformed so that the seam 13 a of the rubber liner 13 covering the fixing member 14 is separated from the fixing member 14. Can also be suitably dropped and removed.

  Therefore, it is possible to prevent the formation of a large fixed object 7 as in the conventional mounting structure around the fixing member 14 (lifter portion) in the rotary drum 11. Therefore, since the raw material scraping amount and the scraping height around the fixing member 14 (lifter part) can be adjusted to appropriate values, the raw material can be appropriately rolled and granulated, and the appropriate particle size can be uniform. The granulated product can be produced stably.

  As described above, according to the present embodiment, since the raw material is prevented from adhering to the lifter portion, the raw material can be appropriately rolled and granulated in the rotary drum 11 to produce a granulated product. It is possible to provide a granulated product having a uniform particle size required when it is put into the machine 40. As a result, the productivity of the sintering machine 40 and the quality of the sintered ore can be improved.

  In addition, a sieve sorting device is installed on the outlet side of the drum type granulator 10, the granulated material having a large particle size is removed by this sieve sorting device, and the granulated product is returned to the inlet side of the drum type granulator 10 and granulated again. There are things to do. According to the present embodiment, since stable granulation can be performed by the drum type granulator 10, it is possible to reduce or eliminate the amount of granulation again. Thereby, the raw material amount thrown into the drum type granulator 10 can be reduced, and it is possible to prevent not only the drum type granulator 10 but also the conveying capacity before and after the drum type granulator 10 from becoming a problem. For example, in some cases, the installation itself of the sieve screening device can be omitted, and the effect is very great from the viewpoint of running cost.

  Moreover, in the conventional drum type granulator, the power (for example, the power of the motor) of the rotary drive mechanism that rotates the rotary drum 1 may be insufficient due to the adhesion of the raw material to the rotary drum 1. However, according to this embodiment, the amount of raw material attached to the rotary drum 11 can be greatly reduced, so that the problem of insufficient power of the rotary drive mechanism can also be solved.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above embodiment, the rubber liner 13 made of a rubber sheet is used alone as a lining material for preventing adhesion of raw materials, but the present invention is not limited to such an example. For example, a lining material having a two-layer structure in which a coating sheet made of polytetrafluoroethylene (Teflon (registered trademark)) is bonded to the surface of a rubber liner may be used. Thereby, it becomes difficult for a raw material to adhere with respect to the rubber liner surface in which the coating sheet was provided. Further, by forming a fine textured pattern such as a satin-like surface on the surface of the rubber liner, it is possible to more suitably prevent the material from adhering than when the surface is a smooth surface.

  Moreover, in the said embodiment, when covering the fixing member 14 of a rectangular cross section with the rubber liner 13, the corner part where the rubber liner 13 was bent at substantially right angle was formed (refer FIG.6, 7, 9, 10 grade | etc.,). .) Therefore, in order to reinforce the corner portion of such a rubber liner 13, a reinforcing material (for example, canvas, thin steel material, etc.) may be attached to the inside of the corner portion. Thereby, the corner part which is a movable part which repeatedly moves with rotation of a rotating drum can be reinforced.

  Moreover, in the said embodiment, the drum type granulator of this invention was applied to the granulators 24 and 35 of the sintering equipment shown in FIG. 4, and the example which granulates a sintering raw material was demonstrated. However, the present invention is not limited to such examples, and can be applied to various drum-type granulators for granulating arbitrary materials to be granulated such as various raw materials and foods.

DESCRIPTION OF SYMBOLS 7 Fixed thing 10 Drum-type granulator 11 Rotating drum 12 Inner peripheral surface 13 Rubber liner 13a Seam allowance 13b Tip part 14 Fixing member 15 Bolt 16 Conveying mechanism 17, 19 Crevice 18 Circumferentially adjacent seam of seam 50 Band-shaped Cover material 51 Seam of rubber liner adjacent in the longitudinal direction M Raw material A Rotating shaft H Step h Height of fixing member (lifter height)

Claims (9)

A cylindrical rotating drum;
A plurality of rubber liners, which are made of a rectangular rubber sheet and are arranged to be joined together in the circumferential direction of the rotating drum so as to cover the entire inner peripheral surface of the rotating drum;
A plurality of fixing members for fixing the rubber liner to the inner peripheral surface of the rotating drum;
With
The fixing member is disposed in parallel to the longitudinal direction of the rotating drum along a seam of the rubber liners adjacent to each other in the circumferential direction, and has a joint margin between the rubber liners adjacent to each other in the circumferential direction. , And fixed to the inner peripheral surface of the rotating drum so as to be sandwiched between the inner peripheral surface of the rotating drum,
The drum-type granulator according to claim 1, wherein at a joint of the rubber liners adjacent to each other in the circumferential direction, a joint of at least one of the rubber liners is covered so as to involve the fixing member.   2. The drum according to claim 1, wherein a portion of the seam allowance of the rubber liner that covers the fixing member is not fixed to the fixing member and can be contacted and separated from the fixing member. Mold granulator. One fixing member is installed for each joint of the rubber liners adjacent to each other in the circumferential direction,
In the joint of the rubber liners adjacent to each other in the circumferential direction, the joint margin of one rubber liner is disposed along the inner peripheral surface of the rotating drum, and the joint margin of the other rubber liner is the fixing member. Cover it like a roll,
The front ends of the joint margins of the rubber liners adjacent to each other in the circumferential direction are arranged so as to overlap each other, and are sandwiched between the one fixed member and the inner peripheral surface of the rotary drum. The drum type granulator according to claim 1 or 2, wherein the drum type granulator is fixed to the inner peripheral surface of the drum. The one rubber liner is a rubber liner disposed on the rotation direction side of the rotating drum, and the other rubber liner is a rubber liner disposed on the rotation direction opposite side of the rotation drum,
The drum type granulator according to claim 3, wherein the granulated material in the rotating drum is scraped up by the fixing member covered by the joint margin of the other rubber liner.   The drum type granulator according to claim 4, wherein the rotating direction of the rotating drum is changed according to the adhesion of the granulated material. Two fixing members are juxtaposed for each joint of the rubber liners adjacent to each other in the circumferential direction,
In the joint of the rubber liners adjacent to each other in the circumferential direction, the joint of one rubber liner and the joint of the other rubber liner are disposed so as to contact each other between the two fixing members. ,
The joint margin of the one rubber liner covers the one fixing member of the two fixing members so as to be wound around, and the tip end portion of the joint margin is the inner peripheral surface of the one fixing member and the rotating drum. And is fixed to the inner peripheral surface of the rotating drum,
The seam allowance of the other rubber liner covers the other fixing member of the two fixing members so as to be wound around, and the tip of the seam allowance is the inner peripheral surface of the other fixing member and the rotating drum. The drum type granulator according to claim 1, wherein the drum type granulator is fixed to an inner peripheral surface of the rotating drum.   The drum type according to claim 6, wherein a radial height of the rotating drum of the one fixing member and a radial height of the rotating drum of the other fixing member are the same. Granulator. The one rubber liner is a rubber liner disposed on the rotation direction side of the rotating drum, and the other rubber liner is a rubber liner disposed on the rotation direction opposite side of the rotation drum,
The radial height of the rotating drum of the other fixing member is higher than the radial height of the rotating drum of the one fixing member,
A granulated object in the rotating drum is formed by a step between the other fixing member covered by the joint of the other rubber liner and the one fixing member covered by the joint of the one rubber liner. The drum type granulator according to claim 6, wherein the drum type granulator is scraped up. A granulation method for granulating a granulated product using the drum type granulator according to any one of claims 1 to 8,
When each of the rubber liners attached to the inner peripheral surface of the rotating drum by the fixing member moves upward with the rotation of the rotating drum when rotating the rotating drum to granulate the granulated material. Further, the granulation method is characterized in that the granulated material adhering to the rubber liner is released by being deformed into a convex cross section toward the inside of the rotating drum.

Images