JP5898330B2 - Air dryer - Google Patents

Description

  The present invention relates to an airflow drying apparatus that pulverizes a bulk material containing moisture and dry it with hot air.

  A conventional airflow drying apparatus is disclosed in Patent Document 1. This airflow drying apparatus includes a vertical cylindrical casing formed of a steel plate or the like, and a raw material supply unit that supplies a raw material containing moisture is provided on the peripheral surface of the casing. A pulverization unit is provided below the raw material supply unit in the housing to pulverize the bulk material into powder particles. The pulverization unit is configured by arranging a plurality of pulverization members on a peripheral portion of a disc-shaped rotating body that rotates on a vertical rotation axis. The rotating body is supported by a bearing portion arranged at the bottom of the casing.

  Since the raw material finely pulverized by the rotation of the pulverizing member collides with the inner wall of the casing by centrifugal force, the inner wall of the casing is worn. For this reason, the housing has an annular liner formed of stainless steel or the like so as to face the grinding member.

  A hot air inlet is provided below the pulverization unit so as to open in the peripheral surface of the housing and take hot air into the housing. A discharge part opens in the upper part of a housing | casing, and a granular material is discharged | emitted with an airflow with the air blower connected with a discharge part. The discharge part is provided with a classification part for classifying the powder particles. In the classifying unit, a classifying rotor configured by radially setting classifying blades made of a plurality of thin plates rotates.

  In the airflow drying device having the above-described configuration, the raw material containing moisture falls from the raw material supply unit and is supplied onto the rotating body of the pulverization unit. The massive raw material is made fine by collision with the pulverizing member and pulverized into powder particles. Hot air flows into the housing from the hot air inlet, and the granular material is blown up by hot air rising between the grinding member and the liner. As a result, the powder particles are further dispersed and dried while rising in the housing.

  In addition, the classification rotor of the classification unit rotates to generate a swirling airflow in the upper part of the casing, and centrifugal force due to the swirling airflow and suction force from the blower act on the powder that has reached the vicinity of the classification rotor. A raw material that is not sufficiently pulverized or a granular material that is insufficiently dispersed has a greater action of centrifugal force, so it is blown to the outside of the classification rotor and falls, and then pulverized or dried again.

  The powder that has been dried and sufficiently pulverized and dispersed has a larger suction force, flows into the classification rotor through the gap between the classification blades, and is discharged from the discharge section. Thereby, the dry granular material of a uniform magnitude | size is obtained.

Japanese Patent Laid-Open No. 2001-41652 (pages 5-7, FIG. 1)

  However, according to the conventional airflow drying apparatus described above, the outer peripheral surface of the liner is exposed to the outside air, and the heat of vaporization is deprived by evaporation of the moisture of the raw material that collides with the inner peripheral surface. Thereby, even if hot air of, for example, 300 ° C. is supplied from the inlet, the temperature of the liner is lowered to about 80 ° C. to 120 ° C. For this reason, in the vicinity of the liner, the raw material (powder particles) has a high moisture content, and the raw material adheres to the liner and grows. As a result, the air flow path between the pulverizing member and the liner is blocked, and there is a problem that the drying efficiency of the airflow drying device is lowered due to an increase in pressure loss.

  An object of this invention is to provide the airflow drying apparatus which can solve the said subject and can improve drying efficiency.

  In order to achieve the above object, the present invention provides a vertical cylindrical casing, a raw material supply section for supplying a raw material containing moisture in the casing, and a vertical rotation arranged below the raw material supply section. A disk-shaped rotating body that rotates on a shaft, a pulverizing member that is disposed around the rotating body and pulverizes the raw material into powder, and hot air supply that supplies hot air below the rotating body in the housing And a discharge unit that discharges the granular material from the upper part of the housing, and the airflow drying apparatus that discharges the granular material pulverized by the pulverizing member with hot air, the housing includes the pulverizing member And an outer peripheral portion where the hot air supply unit faces the outer peripheral surface of the liner and the hot air circulates between the pulverizing member and the liner. And an inner peripheral portion that guides.

  According to this structure, the hot air which distribute | circulates the outer peripheral part of a hot air supply part facing the outer peripheral surface of a liner raises between a grinding | pulverization member and a liner via an inner peripheral part. The raw material falling from the raw material supply section is pulverized into powder by a rotating pulverizing member, dried while being blown up inside the casing by hot air, and discharged from the discharge section.

  According to the present invention, in the airflow drying apparatus having the above-described configuration, a bearing portion that is arranged at a bottom portion of the casing and pivotally supports the rotating body, and an external airflow that allows the outside air to flow into the casing from below the hot air supply section. It is characterized by having an entrance. According to this configuration, the bearing portion disposed at the bottom of the casing is cooled by the outside air flowing from the outside air flow inlet disposed below the hot air supply portion.

  Further, the present invention is characterized in that, in the airflow drying device having the above-described configuration, the inner peripheral portion has a horizontal portion that extends horizontally from the upper end of the peripheral wall facing the inner surface of the housing and is close to the lower surface of the rotating body. Yes. According to this configuration, the bearing portion is isolated from the hot air by the peripheral wall and the horizontal portion of the inner peripheral portion. Further, the outside air that has flowed into the housing from the outside air flow inlet passes between the horizontal portion and the rotating body and joins the hot air.

  Moreover, the present invention is characterized in that, in the airflow drying device having the above-described configuration, the outer peripheral portion is formed in an annular shape covering the entire circumference of the liner.

  Further, the present invention provides the airflow drying apparatus having the above-described configuration, wherein the liner includes a cylindrical body of a good thermal conductor and a plurality of plate-shaped liner chips arranged in parallel in the circumferential direction on the inner peripheral surface of the cylindrical body. It is characterized by having.

  According to this structure, the outer peripheral surface of the cylindrical body of a good heat conductor such as a metal faces the outer peripheral portion of the hot air supply unit, and the liner chip faces the grinding member. The cylindrical body of the good thermal conductor is heated by hot air flowing through the outer peripheral portion, and is transferred to the liner chip on the inner surface side.

  Further, the present invention is characterized in that, in the airflow drying device having the above-described configuration, the liner chip is formed of a cemented carbide, ceramics, or a metal whose surface is subjected to wear resistance treatment.

  According to the present invention, in the airflow drying apparatus having the above-described configuration, a metal locking member is provided on the upper and lower surfaces of the cylindrical body to lock the inner surface of the liner chip, and the liner chip is made of cemented carbide. Alternatively, it is formed of ceramics, and a radial and axial gap is provided between the locking member and the liner chip. According to this configuration, the difference in thermal expansion between the cemented carbide or ceramic liner chip and the tubular body caused by hot air is absorbed by the gap provided between the locking member and the liner chip.

  Further, the present invention provides an airflow drying apparatus having the above-described configuration, wherein a classification rotor for classifying powder particles rising in the casing by hot air by rotation of a classification blade arranged radially is provided at an upper part of the casing, and the classification is performed. The inner wall of the casing facing the rotor is formed in a tapered shape with a narrow upper part.

  According to this configuration, the classifying rotor rotates to form a swirling airflow, and the large mass powder particles are blown out of the classifying rotor by centrifugal force. The granular material having a small mass flows into the classification rotor from between the classification rotors and is discharged from the discharge portion. The hot air is guided to the classification rotor along the tapered inner wall at the top of the housing, and the powder particles are dispersed while being dried to prevent the powder particles from adhering to the housing inner wall.

  According to the present invention, in the airflow drying apparatus having the above-described configuration, the rotating body includes a disk-shaped metal plate and is provided with a protruding portion protruding on the upper surface, and the pulverized member is formed of cemented carbide or ceramics. The bolt is screwed to the rotating body with an axial gap, and a small diameter portion smaller than the protruding portion is formed above the protruding portion by the rotating body or the bolt. A through hole having a first fitting portion that fits into the protruding portion and a second fitting portion that fits into the small diameter portion is provided, and a gap between the first fitting portion and the protruding portion is a second fitting. It is characterized by being smaller than the gap between the joint portion and the small diameter portion.

  According to this configuration, the cemented carbide or ceramic pulverized member is screwed to the rotating metal plate with the bolts with the gaps in the axial direction and the radial direction. A difference in thermal expansion between the rotating body or bolt caused by hot air and the pulverized member is absorbed by the gap. Further, when the pulverizing member swings due to the rotation of the rotating body, the large-diameter protruding portion and the first fitting portion collide with each other, thereby preventing the small-diameter portion from being broken.

  Further, the present invention provides an airflow drying apparatus having the above-described configuration, wherein the rotating body includes a metal base having a shaft portion protruding from the upper surface, and a shaft hole that fits the shaft portion. And a holding member attached to the shaft portion having an O-ring, and pressing the upper surface of the upper surface plate with the O-ring. A top plate is held on the base.

  According to this configuration, even if a difference in thermal expansion occurs between the metal base and the cemented carbide or ceramic top plate by hot air, the top plate is held on the base by the O-ring that presses the top plate. The

  According to the present invention, the hot air supply part has an outer peripheral part that faces the outer peripheral surface of the liner and through which the hot air flows, and an inner peripheral part that guides the hot air between the pulverizing member and the liner, so that the liner is maintained at a high temperature. be able to. Therefore, the adhesion of the raw material to the inner wall of the liner can be reduced, and the drying efficiency of the airflow drying device can be improved.

  Further, according to the present invention, the bearing portion is arranged at the bottom of the housing, and the external air flow inlet is provided to allow the outside air to flow into the housing from below the hot air supply portion, so that the bearing portion is cooled by the outside air flowing from the external air flow inlet. Is done. For this reason, a rotary body can be rotated at a high rotational speed, and a raw material can be grind | pulverized rapidly. Therefore, the drying efficiency of the airflow drying device can be further improved.

  According to the present invention, the inner peripheral portion of the hot air supply portion has a horizontal portion that extends horizontally from the upper end of the peripheral wall facing the inner surface of the housing and is close to the lower surface of the rotating body. Thereby, the outflow of hot air from an inner peripheral part can be prevented, and the reduction | decrease of the hot air supplied between a grinding | pulverization member and a liner can be suppressed. Therefore, the drying efficiency of the airflow drying device can be further improved.

  Further, according to the present invention, since the outer peripheral portion of the hot air supply unit is formed in an annular shape covering the entire circumference of the liner, it is possible to maintain the entire annular liner at a high temperature and further reduce the adhesion of raw materials.

  In addition, according to the present invention, since the liner is provided with a plurality of plate-like liner chips arranged in parallel in the circumferential direction on the inner peripheral surface of the cylindrical body of a good thermal conductor, it can be easily replaced even if the liner chips are worn, The maintainability of the airflow drying device can be improved. In addition, a liner having a large diameter and high wear resistance on the inner surface can be easily formed.

  According to the invention, the liner chip is locked with the radial and axial gaps by the locking members disposed on the upper and lower surfaces of the cylindrical body. Thereby, the wear of the liner due to the collision of the raw materials can be reduced by the liner chip made of cemented carbide or ceramics. Moreover, the thermal expansion difference due to the hot air between the cylindrical body or the locking member and the liner chip is absorbed by the gap, and damage to the liner chip due to thermal expansion can be prevented.

  Further, according to the present invention, the inner wall of the casing facing the classification rotor provided at the upper part of the casing is formed in a tapered shape with a narrow upper part, so that the adhesion of the raw material inside the casing can be reduced. Accordingly, it is possible to improve the maintainability of the airflow drying device and to further improve the collection efficiency of the granular material.

  According to the present invention, the rotating body has a metal plate, the protruding portion protrudes from the upper surface, and a hammer formed of cemented carbide or ceramics is screwed with a bolt with an axial gap. The hammer is provided with a first fitting portion and a second fitting portion that are fitted to the protruding portion and the small diameter portion formed by the rotating body or the bolt, respectively, and the gap between the first fitting portion and the protruding portion is the second fitting portion. It is formed smaller than the gap with the small diameter portion. For this reason, a protrusion part contacts the inner surface of a 1st fitting part, the rocking | fluctuation range of a hammer is controlled, and the collision with the inner surface of a 2nd fitting part and a small diameter part is avoided. Thereby, the breakage of the bolt due to repeated collisions can be prevented, and the rotating body can be reduced in weight.

  Further, according to the present invention, the rotating body has a metal base with the shaft protruding from the shaft, and a cemented carbide or ceramic top plate fitted to the shaft, and is provided on the holding member attached to the shaft. The upper surface plate is held on the base by pressing the upper surface of the upper surface plate with the O-ring. As a result, the thermal expansion difference due to hot air between the metal base and shaft and the cemented carbide or ceramic top plate is absorbed. Accordingly, it is possible to prevent the top plate from being damaged due to thermal expansion.

The front view which shows the airflow drying apparatus of embodiment of this invention The top view which shows the airflow drying apparatus of embodiment of this invention. Front sectional drawing which shows the main-body part of the airflow drying apparatus of embodiment of this invention. Front sectional drawing which shows the grinding | pulverization part and hot air supply part of the airflow drying apparatus of embodiment of this invention The top view which shows the grinding | pulverization part of the main-body part of the airflow drying apparatus of embodiment of this invention. Front sectional drawing which shows the classification part of the airflow drying apparatus of embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a front view and a top view of an airflow drying apparatus according to an embodiment. In the air flow drying device 1, a main body 2 and a drive motor 3 are arranged on a gantry 4. A belt (not shown) for connecting the drive motor 3 and a shaft portion 52 (see FIG. 3) of the crushing portion 50 described later is disposed in the gantry 4.

  The main body 2 includes a vertical cylindrical housing 10, and a classification unit 40 and an exhaust duct 11 (discharge unit) are provided on the top of the housing 10. The exhaust duct 11 is connected to a blower (not shown) via a collector (not shown). As will be described later, the granular material obtained by pulverizing and drying the raw material is discharged through the exhaust duct 11 by the drive of the blower and is collected by the collector.

  A raw material supply unit 12 is provided at a substantially central portion of the housing 10. The raw material supply unit 12 is provided with a screw feeder (not shown), and drops and supplies a massive raw material containing moisture to the housing 10 by the rotation of the screw feeder. A hot air supply unit 20 is provided below the raw material supply unit 12. The hot air supply unit 20 is connected to a hot air generator (not shown) that generates and sends hot air through a hot air inlet 20 a and supplies hot air into the housing 10.

  FIG. 3 is a front sectional view of the main body 2. The casing 10 is formed by connecting the first casing 13, the liner 30, the second casing 14, the third casing 15, and the fourth casing 16 from below. The first casing 13 disposed at the bottom of the housing 10 is fixed by a bolt 13a on a bottom plate 17 fixed to the mount 4 (see FIG. 1) by a bolt 17a. An external air flow inlet 13 b through which external air flows is opened on the peripheral surface of the first casing 13.

  On the upper surface of the first casing 13, an angle 23 having a U-shaped cross section forming the hot air supply unit 20 is integrated by welding. The liner 30 is installed on the bottom surface 23 a of the angle 23. The second casing 14 is fixed to the upper surface of the angle 23 with bolts 14a. A raw material supply unit 12 is provided on the peripheral surface of the second casing 14, and a window portion 14 b for visually recognizing the inside of the housing 10 is formed.

  The third casing 15 is fixed on the second casing 14 by bolts 15a, and the inner wall of the third casing 15 is formed in a tapered shape with a narrow upper portion. The fourth casing 16 is fixed on the third casing 15 by bolts 16a. An exhaust duct 11 is provided on the peripheral surface of the fourth casing 16 to form an L-shaped exhaust path 16b. Further, a classification rotor 43 described later is attached to the fourth casing 16.

  A crushing unit 50 for crushing the raw material is provided below the raw material supply unit 12 in the housing 10. The crushing unit 50 includes a rotating body 55 and a hammer 62 (crushing member). The rotating body 55 is formed in a disk shape, and a shaft portion 52 that forms a rotating shaft is pivotally supported by a bearing portion 51 fixed to the bottom plate 17. Thereby, the bearing part 51 is arrange | positioned facing the external airflow inlet 13b. The shaft portion 52 is connected to the drive motor 3 (see FIG. 1) via a belt (not shown). A plurality of hammers 62 are provided on the periphery of the rotator 55 and are disposed opposite the liner 30.

  FIG. 4 is a front sectional view showing details of the hot air supply unit 20 and the pulverization unit 50. FIG. 5 is a plan view showing the main parts of the liner 30 and the crushing part 50. The hot air supply unit 20 has an outer peripheral part 21 formed on the outer side of the housing 10 and an inner peripheral part 22 formed on the inner side. The angle 23 of the hot air supply unit 20 is formed in an annular shape having a U-shaped front cross section including a bottom surface portion 23a, a side surface portion 23b, and an upper surface portion 23c.

  The horizontally disposed bottom surface portion 23 a is welded to the upper end of the first casing 13 and extends from the first casing 13 to the inner peripheral side and the outer peripheral side. The side surface portion 23b is formed in a cylindrical shape extending vertically from the outer peripheral end of the bottom surface portion 23a, and the upper surface portion 23c is formed in an annular shape extending horizontally from the upper end of the side surface portion 23b to the inner peripheral side. A hot air inlet 20a (see FIG. 3) through which hot air flows flows into the side surface portion 23b.

  A stand 31 having a plurality of legs 31a erected in the circumferential direction is installed on the bottom 23a of the angle 23, and the liner 30 is placed on the legs 31a. The stand 31 is positioned by a pin 31d inserted through the bottom surface portion 23a, and an opening 31c is formed between the leg portions 31a.

  The liner 30 includes a cylindrical body 32, an upper surface locking member 33, a lower surface locking member 34, and a liner chip 35. The cylindrical body 32 is formed in a cylindrical shape by a heat good conductor such as metal (stainless steel or the like). The upper surface locking member 33 and the lower surface locking member 34 are formed in an annular shape by a good heat conductor such as metal (stainless steel or the like), and are fixed to the upper surface and the lower surface of the cylindrical body 32 by bolts 33a and 34a, respectively. Locking claws 33b and 34b that are bent toward each other are formed at the inner peripheral ends of the upper surface locking member 33 and the lower surface locking member. Further, the lower surface locking member 34 is placed on the leg portion 31a and positioned by the pin 31b.

  The liner chip 35 is formed in a plate shape from a cemented carbide or ceramic (alumina, zirconia, etc.) having high hardness and excellent wear resistance. The liner chip 35 may be formed of another wear-resistant material, or may be formed by performing a wear-resistant treatment on the surface of a metal member such as stainless steel.

  A plurality of liner chips 35 are provided, and are arranged in parallel with each other in the circumferential direction along the inner peripheral surface of the cylindrical body 32. Thus, the liner 30 is formed with a polygonal inner peripheral surface facing the hammer 62. The upper and lower ends on the inner surface side of the liner chip 35 are formed on the inclined surface 35a. The locking claws 33b, 34b of the upper surface locking member 33 and the lower surface locking member 34 face the inclined surface 35a to lock the liner chip 35, and the cylindrical body 32 and the liner chip 35 are integrated.

  Thereby, since the liner chip 35 with high wear resistance is disposed to face the hammer 62, the wear of the liner 30 due to the collision of the raw materials can be reduced. Moreover, even if the liner chip 35 is worn, it can be easily replaced, and the maintainability of the airflow drying device 1 can be improved. Furthermore, although it is difficult to form a large liner 30 having a diameter of 1 m or more with a cemented carbide or ceramics in a cylindrical shape, according to the above configuration, a large liner 30 having a diameter exceeding 1 m can be easily formed. Can do.

  A predetermined amount of gap is provided between the liner chip 35 and the upper surface locking member 33 and between the liner chip 35 and the lower surface locking member 34 in the axial direction and the radial direction. Thereby, the thermal expansion difference due to the hot air flowing through the hot air supply unit 20 between the cylindrical body 32 such as metal, the upper surface locking member 33, the lower surface locking member 34 and the liner chip 35 is absorbed by the gap. Therefore, damage to the liner chip 35 due to thermal expansion can be prevented.

  An annular liner presser 37 is installed on the upper surface locking member 33 of the liner 30. The space between the upper surface portion 23 c of the angle 23 and the liner 30 is closed by the liner presser 37. Accordingly, the outer peripheral portion 21 of the hot air supply unit 20 is surrounded by the angle 23, the liner 30 and the liner presser 37 to cover the entire periphery of the liner 30, and the hot air flows through the outer peripheral surface of the liner 30.

  Further, an inner cylinder 38 (see FIG. 3) is disposed above the crushing part 50 in the housing 10 as necessary. The inner cylinder 38 is supported by pressing a ring 38 a integral with the inner cylinder 38 by a bolt 37 a that is screwed onto the peripheral surface of the liner presser 37. A ventilation channel is formed in the outer periphery of the housing 10 by the inner cylinder 38.

  A guard 24 is attached to the bottom surface portion 23 a of the angle 23 with a bolt 24 a inside the housing 10. The guard 24 has an annular portion 24b erected on the bottom surface portion 23a, and a horizontal portion 24c extending in the horizontal direction from the upper end of the annular portion 24b. The annular portion 24 b faces the inner wall of the housing 10 and forms a peripheral wall of the inner peripheral portion 22 of the hot air supply unit 20. As a result, the inner peripheral portion 22 communicates with the outer peripheral portion 21 via the opening 31 c below the liner 30, and guides hot air between the hammer 62 and the liner 30. The horizontal portion 24 c is close to the lower surface of the rotating body 55, and the inner peripheral end of the horizontal portion 24 c is close to the shaft portion 52 of the rotating body 55.

  The rotating body 55 of the crushing unit 50 is formed in a disc shape, and an upper surface plate 57 is disposed on the upper surface of a base 56 made of metal (stainless steel or the like). The upper surface plate 57 is formed of a cemented carbide or ceramic (alumina, zirconia, etc.) having high hardness and excellent wear resistance. The upper surface plate 57 may be formed of other wear-resistant materials, or may be formed by performing a wear-resistance treatment on the surface of a metal member such as stainless steel.

  By forming the upper surface plate 57 from ceramics or the like, wear on the upper surface of the rotating body 55 that collides with the raw material can be reduced. The shaft portion 52 that forms the rotation shaft of the rotating body 55 is made of metal (stainless steel or the like), and has a flange portion 52a that protrudes from the peripheral surface and a boss 52b that protrudes upward from the flange portion 52a.

  The base 56 and the upper surface plate 57 are respectively provided with shaft holes 56a and 57a that fit into the boss 52b. The base 56 is fixed on the flange 52a by a bolt 56b through the boss 52b through the shaft hole 56a. As a result, the base 56 and the shaft portion 52 are integrated, and a part of the boss 52 b of the shaft portion 52 protrudes from the upper surface of the base 56.

  A holding member 53 is attached to the upper surface of the boss 52b by a bolt 53a. The holding member 53 protrudes in the outer circumferential direction from the boss 52 b, and an O-ring 54 is disposed in an annular groove 53 b formed facing the upper surface plate 57. The upper surface of the upper surface plate 57 is pressed by the O-ring 54, and the upper surface plate 57 is held on the base 56 in a state where relative expansion and contraction by heat is possible. Thereby, the thermal expansion difference by a hot air with the metal base 56 and the axial part 52, and the upper surface board 57 formed with the cemented carbide or ceramics is absorbed. Therefore, damage to the upper surface plate 57 due to thermal expansion can be prevented.

  A plurality of hammers 62 are attached to the circumferential portion of the rotating body 55 at predetermined intervals in the circumferential direction. Since the hammer 62 collides with the raw material at a high speed, it is formed of a cemented carbide or ceramics (alumina, zirconia, etc.) having high strength and hardness and excellent wear resistance. The hammer 62 may be formed of other wear-resistant materials, or may be formed by performing a wear-resistant treatment on the surface of a metal member such as stainless steel.

  A plurality of concave portions 56c having a circular shape in plan view are formed in the peripheral portion of the base 56, and a cylindrical metal (stainless steel or the like) boss member 61 penetrating the upper surface plate 57 is fitted into the concave portion 56c. The boss member 61 is stopped by a pin 64 and screwed to the base 56 by a bolt 63 passing through the hammer 62 and the boss member 61. As a result, the metal plate base 56 and the boss member 61 are integrated, and the boss member 61 forms a protruding portion 61 a that protrudes from the upper surface of the rotating body 55.

  The bolt 63 is formed in a stepped shape, and a small diameter portion 63 a having a smaller diameter than the boss member 61 is disposed on the upper surface of the boss member 61. The through hole of the hammer 62 through which the bolt 63 is inserted has a first fitting portion 62a that fits into the protruding portion 61a and a second fitting portion 62b that fits into the small diameter portion 63a. A counterbore is provided above.

  The hammer 62 is prevented from rotating with respect to the boss member 61 by the pin 65, and when the boss member 61 is fixed by the bolt 63, an axial gap is formed between the hammer 62 and the bolt 63. Thereby, the hammer 62 can swing somewhat, and the thermal expansion difference due to hot air between the metal boss member 61 and the hammer 62 formed of cemented carbide or ceramics is absorbed. Therefore, damage to the hammer 62 due to thermal expansion can be prevented.

  Further, the gap between the first fitting portion 62a and the protruding portion 61a is formed smaller than the gap between the second fitting portion 62b and the small diameter portion 63a. For this reason, the hammer 62 that swings due to the rotation of the rotating body 55 has its boss member 61 in contact with the inner surface of the first fitting portion 62a, and the swing range is restricted. Thereby, the collision with the inner surface of the 2nd fitting part 62b and the small diameter part 63a is avoided, and the fracture | rupture of the volt | bolt 63 by repeated collision can be prevented.

  Further, when the hammer 62 is formed of ceramics, the metal portion above the boss member 61 is formed thinner, so that the rotating body 55 can be made lighter than using a large-diameter bolt similar to the boss member 61. it can. The small diameter portion 63a may be formed on the boss member 61 integral with the base 56.

  FIG. 6 is a front sectional view of the classifying unit 40. The classification unit 40 includes a classification motor 41 (see FIG. 2) disposed on the fourth casing 16, and a shaft 42 that is belt-driven by the classification motor 41 protrudes into the housing 10 and is disposed vertically. A classification rotor 43 is attached to the lower part of the shaft 42. In the classification rotor 43, a plurality of thin plate-shaped classification blades 46 are radially provided on a disk 44 screwed to the lower end of the shaft 42. The upper part of each classification blade 46 is connected by an annular member 45.

  In the airflow drying device 1 having the above configuration, hot air flows through the outer peripheral portion 21 of the hot air supply unit 20 by driving the hot air generator. Thereby, the temperature of the cylindrical body 32 forming the outer peripheral surface of the liner 30 is increased. Since the cylindrical body 32 is formed of a good heat conductor, the temperature of the liner chip 35 that forms the inner peripheral surface of the liner 30 is raised by heat transfer and maintained at a high temperature (for example, 600 ° C.). The hot air flowing through the outer peripheral portion 21 flows through the inner peripheral portion 22 through the opening 31 c and is guided between the hammer 62 and the liner 30.

  In addition, ascending airflow is formed in the housing 10 by driving the blower connected to the exhaust duct 11. Thereby, the hot air flowing in from the hot air supply unit 20 rises in the housing 10 and the outside air flows into the housing 10 through the external air flow inlet 13b. The outside air flowing in from the outside air flow inlet 13b flows through the gap between the horizontal portion 24c and the shaft portion 52 of the guard 24 and the gap between the horizontal portion 24c and the lower surface of the rotating body 55, and joins the hot air in the inner peripheral portion 22 and rises. To do.

  At this time, the bearing 51 facing the external air flow inlet 13b is cooled by the external air flowing from the external air flow inlet 13b. For this reason, the rotating body 55 rotated by the drive of the drive motor 3 can be rotated at a higher rotational speed (for example, the peripheral speed is 100 m / s to 150 m / s) than before, and the raw material can be pulverized quickly. it can. Further, hot air having a temperature higher than that of the conventional one can be supplied from the hot air supply unit 20 into the housing 10.

  A massive raw material containing moisture falls from the raw material supply unit 12 onto the rotating body 55. The raw material is guided toward the outer periphery of the rotating body 55 by the centrifugal force generated by the rotation of the rotating body 55. Then, the raw material collides with the hammer 62 and is finely divided, and is pulverized into powder particles. At this time, since the liner 30 is maintained at a high temperature, the raw material containing moisture that collides with the liner 30 is dried, and adhesion of the raw material of the liner 30 can be reduced.

  The granular material pulverized by the hammer 62 is further dispersed while being dried by hot air, blown upward, and ascends inside the housing 10 together with the hot air. The granular material rising in the housing 10 is guided along the inner wall of the tapered third casing 15 at the upper part of the housing 10 in the central direction where the classification rotor 43 is disposed. When the third casing 15 facing the classification rotor 43 is formed in a cylindrical shape, the powder particles are easily attached and deposited on the inner peripheral surface of the upper portion of the casing 10. By forming the third casing 15 in a tapered shape with a narrow upper portion, the airflow can flow along the inclined surface, and adhesion of the raw material on the upper portion of the housing 10 can be reduced.

  The classification rotor 43 generates a swirling airflow in the upper part of the housing 10 by the classification blade 46 rotated by the classification motor 41. Centrifugal force due to the swirling airflow and force directed toward the center by the blower connected to the exhaust duct 11 are applied to the granular material that has moved up in the housing 10 and has reached the vicinity of the classification rotor 43. The granular material having a large mass aggregated due to insufficient drying has a larger centrifugal force, and after being blown to the outside of the classification rotor 43, it is circulated to the lower crushing section 50. On the other hand, the sufficiently dispersed and dried powder particles having a small mass have a larger force toward the center and flow into the classification rotor 43 through the gap between the classification blades 46 and are discharged from the exhaust duct 11. Thereby, the dry granular material of a uniform magnitude | size is collect | recovered.

  According to the present embodiment, the hot air supply unit 20 faces the outer peripheral surface of the liner 30 and the outer peripheral portion 21 through which the hot air flows, and the inner peripheral portion 22 that guides the hot air between the hammer 62 (grinding member) and the liner 30. Therefore, the liner 30 can be maintained at a high temperature. Therefore, the adhesion of the raw material to the inner wall of the liner 30 can be reduced, and the drying efficiency of the airflow drying device 1 can be improved.

  Further, since the bearing portion 51 is disposed at the bottom of the housing 10 and the external air flow inlet 13b for allowing the outside air to flow into the housing 10 from below the hot air supply portion 20 is provided, the bearing is supported by the external air flowing from the external air flow inlet 13b. The part 51 is cooled. For this reason, the rotating body 55 can be rotated at a high rotation speed, and the raw material can be pulverized quickly. Therefore, the drying efficiency of the airflow drying device 1 can be further improved.

  Further, the inner peripheral portion 22 of the hot air supply unit 20 is formed with a peripheral wall facing the inner surface of the housing 10 by the annular portion 24b of the guard 24, and the horizontal portion 24c extending horizontally from the upper end of the annular portion 24b is the lower surface of the rotating body 55. Proximity to. Thereby, the outflow of the hot air from the inner peripheral part 22 can be prevented, and the reduction of the hot air supplied between the hammer 62 and the liner 30 can be suppressed. Therefore, the drying efficiency of the airflow drying device 1 can be further improved.

  Further, since the angle 23 of the hot air supply unit 20 is installed on the first casing 13 that opens the external air flow inlet 13b, the bottom surface 23a of the angle 23 and the liner 30 are arranged close to each other. And the inner peripheral part 22 forms the flow path of the hot air along the inner wall of the housing | casing 10 by the annular part 24b of the guard 24 attached to the bottom face part 23a. For this reason, the flow velocity of the hot air flowing into the inner peripheral portion 22 from the opening 31c and flowing through the inner peripheral portion 22 can be increased. Thereby, the granular material which fell on the bottom face part 23a is easily guide | induced upward by the hot air which raises the inner peripheral part 22, and can improve the recovery rate of a granular material more.

  Moreover, since the outer peripheral part 21 of the hot air supply part 20 is formed in an annular shape that covers the entire circumference of the liner 30, the entire annular liner 30 can be maintained at a high temperature to further reduce the adhesion of raw materials.

  Further, since the liner 30 has a plurality of plate-like liner chips 35 arranged in the circumferential direction on the inner peripheral surface of the cylindrical body 32 of a good thermal conductor, even if the liner chips 35 are worn, they can be easily replaced. The maintainability of the airflow drying device 1 can be improved. Further, the liner 30 having a large diameter and high wear resistance on the inner surface can be easily formed.

  Further, since the liner chip 35 is made of cemented carbide or ceramics, the liner 30 having high wear resistance on the inner surface can be easily realized. Similarly, when the liner chip 35 is formed of a metal subjected to wear resistance treatment, the liner 30 having high wear resistance on the inner surface can be easily realized.

  Further, the liner chip 35 is locked by the upper surface locking member 33 and the lower surface locking member 34 disposed on the upper and lower surfaces of the cylindrical body 32 with gaps in the radial direction and the axial direction. Thereby, the wear of the liner 30 due to the collision of the raw materials can be reduced by the liner chip 35 made of cemented carbide or ceramics. Further, the thermal expansion difference due to the hot air between the cylindrical body 32, the upper surface locking member 33, the lower surface locking member 34, and the liner chip 35 is absorbed by the gap. Therefore, damage to the liner chip 35 due to thermal expansion can be prevented.

  Further, since the inner wall of the third casing 15 facing the classification rotor 43 provided on the upper portion of the housing 10 is formed in a tapered shape, the adhesion of the raw material inside the housing 10 can be reduced. Accordingly, it is possible to improve the maintainability of the airflow drying device 1 and further improve the collection efficiency of the powder particles.

  Further, the rotating body 55 has a metal base 56 (metal plate), the protruding portion 61a protrudes, and a hammer 62 formed of cemented carbide or ceramic has an axial clearance and is screwed with a bolt 63. Is done. The hammer 62 is provided with first and second fitting portions 62a and 62b that are fitted to the protruding portion 61a and the small diameter portion 63a, respectively, and the gap between the first fitting portion 62a and the protruding portion 61a is the second fitting portion. It is formed smaller than the gap between 62b and the small diameter portion 63a.

  For this reason, the boss member 61 abuts on the inner surface of the first fitting portion 62a to restrict the swing range of the hammer 62, and the collision between the inner surface of the second fitting portion 62b and the small diameter portion 63a is avoided. Thereby, the rupture of the bolt 63 due to repeated collisions can be prevented. Further, when the hammer 62 is formed of ceramics, the rotating body 55 can be reduced in weight compared to the case where a thick bolt is used.

  Further, the rotating body 55 has a metal base 56 protruding from the boss 52 b of the shaft portion 52, and a cemented carbide or ceramic top plate 57 fitted to the shaft portion 52, and is attached to the shaft portion 52. The upper surface plate 57 is held on the base 56 by pressing the upper surface of the upper surface plate 57 by the O-ring 54 provided on the holding member 53. Thereby, the thermal expansion difference by the hot air between the metal base 56 and the shaft portion 52 and the cemented carbide or ceramic upper surface plate 57 is absorbed. Therefore, damage to the upper surface plate 57 due to thermal expansion can be prevented.

  In the present embodiment, instead of the hammer 62, a plurality of thin blades may be provided radially on the rotating body 55.

  According to the present invention, it can be used in an air flow drying apparatus that pulverizes a bulk material containing moisture and dries it with hot air.

DESCRIPTION OF SYMBOLS 1 Airflow drying apparatus 2 Main-body part 3 Drive motor 4 Base 10 Housing | casing 11 Exhaust duct 12 Raw material supply part 13 1st casing 13b External airflow inlet 14 2nd casing 14b Window part 15 3rd casing 16 4th casing 16b Exhaust path 17 Bottom plate DESCRIPTION OF SYMBOLS 20 Hot-air supply part 20a Hot-air inlet 21 Outer part 22 Inner part 23 Angle 23a Bottom part 23b Side part 23c Upper surface part 24 Guard 24b Annular part 24c Horizontal part 30 Liner 31 Stand 31a Leg part 31c Opening part 32 Cylindrical body 33 Upper surface Locking member 33b, 34b Locking claw 34 Lower surface locking member 35 Liner tip 37 Liner press 38 Inner cylinder 40 Classification part 41 Classification motor 42 Shaft 43 Classification rotor 44 Disc 45 Annular member 46 Classification blade 50 Grinding part 51 Bearing part 52 Shaft part 53 Holding part 54 O-ring 55 rotating body 56 base plate 57 top plate 61 boss member 61a projecting portions 62 hammer 62a first fitting portion 62b second fitting portion 63 bolt 63a small-diameter portion

Claims (8)

A vertical cylindrical casing, a raw material supply section that supplies a raw material containing moisture in the casing, a disk-shaped rotating body that is arranged below the raw material supply section and rotates on a vertical rotating shaft; A pulverizing member disposed on the periphery of the rotator to pulverize the raw material into powder, a hot air supply unit for supplying hot air to the lower part of the rotator in the casing, and powder particles from the top of the casing An air flow drying apparatus that discharges the granular material pulverized by the pulverizing member by hot air, and the casing includes an annular liner facing the pulverizing member, have a inner peripheral portion for guiding the hot air between the outer peripheral portion of the hot air to flow the hot air supply unit facing the outer peripheral surface of the liner, and the pulverized member passes below the liner and the liner,
An airflow drying device , wherein an inner peripheral wall of the inner peripheral portion is formed by an annular portion facing an inner surface of the casing, and an upper end of the annular portion is close to a lower surface of the rotating body . A bearing portion for supporting the shaft portion of the rotating body disposed at the bottom of the housing, and a fresh air inlet for admitting outside air into the housing from below of the hot air supply unit, the inner peripheral portion The airflow drying device according to claim 1 , further comprising a horizontal portion that extends horizontally from an upper end of the annular portion, and an inner peripheral end of the horizontal portion is close to the shaft portion . Flash drying apparatus of claim 1 or claim 2, wherein the outer peripheral portion is formed in an annular shape to cover the entire circumference of the liner.   The said liner has the cylindrical body of a heat good conductor, and the some plate-shaped liner chip arranged in parallel with the internal peripheral surface of the said cylindrical body in the circumferential direction. The airflow drying apparatus according to any one of the above. 5. The airflow drying apparatus according to claim 4 , wherein the liner chip is made of a cemented carbide, ceramics, or a metal whose surface is subjected to wear resistance treatment. A metal locking member is provided on the upper and lower surfaces of the cylindrical body to lock the inner surface of the liner chip, and the liner chip is formed of cemented carbide or ceramics, and the locking member and the liner The airflow drying apparatus according to claim 4 , wherein a gap in a radial direction and an axial direction is provided between the chip and the chip. The rotating body has a disk-shaped metal plate and is provided with a protruding portion protruding on the upper surface, and the pulverized member is made of cemented carbide or ceramics and has an axial clearance by bolts. A first fitting portion that is screwed to the body, and has a small diameter portion that is smaller in diameter than the protruding portion above the protruding portion by the rotating body or the bolt, and the pulverizing member is fitted into the protruding portion; A through hole having a second fitting portion that fits into the small diameter portion is provided, and a gap between the first fitting portion and the protruding portion is smaller than a gap between the second fitting portion and the small diameter portion. The airflow drying apparatus according to any one of claims 1 to 6 , wherein A metal base having a shaft portion on which the rotating body protrudes on the top surface, and a cemented carbide or ceramic top having a shaft hole fitted to the shaft portion and disposed on the top surface of the base table. A holding member attached to the shaft portion with an O-ring, and pressing the upper surface of the upper surface plate with the O-ring to hold the upper surface plate on the base. The airflow drying apparatus according to any one of claims 1 to 7 , wherein the airflow drying apparatus is characterized.

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