JP6140108B2 - Airflow drying apparatus and airflow drying method - Google Patents

Description

  The present invention relates to an airflow drying apparatus and an airflow drying method suitable for drying an object to be dried that needs to be dried after washing and dewatering a lightweight object such as a synthetic resin film piece.

  As a means for drying dry matter by wind, an air-drying apparatus mainly intended for cutting branches, cut grass, and raw wood chips has been proposed. This drying device is configured so that the storage body 10 formed into a circular cylindrical body with a stainless steel mesh can be tilted, and the required drying material is moved while the storage body 10 is rotated around the major axis by the rotation means 20. The dry matter is dried by blowing air toward the storage body 10 from the blower 50 arranged outside the storage body 10 (Patent Document 1).

  Moreover, as a means for drying a lump-like or powdery body to be dried, a drying cylinder 2 in which a body portion 21 whose upper and lower ends are closed is vertically arranged, and an axial direction of the drying cylinder 2 is arranged, and the drying cylinder 2 The hot air supply pipe 3 is composed of a hot air supply pipe 3 that feeds the hot air HA into the inside and a flat blade 9 that is rotatably arranged at the bottom of the drying cylinder 2, and the hot air supply pipe 3 excluding the hot air supply pipe 3 positioned at the top is the hot air HA. Has been proposed (Patent Document 2), in which a blowing angle is set so as to draw a spiral that reaches the hot-air supply pipe 3 adjacent to the upper side after making a round along the inner peripheral surface 21 of the drying cylinder 2. .

JP 2002-243364 A JP 2005-30650 A

  However, the technique of Patent Document 1 has a problem in terms of drying efficiency because it is configured to blow air from a blower disposed outside toward the housing body 10 made of a perforated plate. In addition, when fine foreign matters are mixed in dry matter such as cut branches, cut grass, and raw wood chips, there is a problem that foreign matters are blown out of the storage body 10 by the wind force and the working environment is deteriorated. .

  The technique of Patent Document 2 is a method in which the required dry body is swung upward from the bottom of the drying cylinder 2 by wind pressure, but individual dry bodies having different shapes and masses are heated in the drying cylinder 2 by the hot air HA. There is a problem in that it is possible to smoothly flow the required drying body and efficiently dry in the meantime, with the configuration in which the wind is sent from below by the flat blade 9 on the swirl flow.

  The present invention has been made in view of the above-described problems of the prior art, and by rotating the object to be dried along the object path with the dry air in a cylindrical drying drum, the contact distance with the dry air and It is an object of the present invention to provide an airflow drying apparatus and an airflow drying method in which the residence time is increased to efficiently and reliably dry.

The invention according to claim 1 configured to solve the above-described problem includes a cylindrical fixed drying drum provided with an input port on one end side in the axial direction and a discharge port on the other end side, and the drying drum The spiral to-be-dried material passage formed from the input port to the discharge port and the to-be-dried material projecting at an appropriate position of the to- be-dried material passage are unwound by a guide plate spirally provided on the inner peripheral surface of the material. Obstacles for the above, a plurality of dry air blowing ports formed in the body of the drying drum so as to be spaced apart in the axial direction, a blower pipe connected to each of the drying air blowing ports, and the body of the drying drum And a plurality of exhaust ports which are arranged apart from each other in the axial direction and are shielded from the dry air blowing port by the guide plate, and a forced exhaust device provided at each exhaust port.

  And the said dry air blowing inlet is good to form in the tangential direction of the said drying drum, located in the said to-be-dried material channel | path.

  The forced exhaust device may be disposed at a position where the dry air blown from the dry air blowing port is turned 270 degrees in the circumferential direction in the drying drum.

According to a fourth aspect of the present invention, there is provided means for forming a spiral object to be dried by a guide plate spirally provided on an inner peripheral surface from an inlet on one axial end side to an outlet on the other end. In a fixed drying drum formed with a passage, they are arranged apart from each other in the axial direction, and dry air is blown from a plurality of dry air blowing ports formed in a tangential direction of the drying drum. By swirling 270 degrees in the circumferential direction in the drying drum, the material to be dried in the drying drum is swirled along the material to be dried , and the obstacle material protruding at an appropriate position of the dry material passage construed dried while humidified air in the drying in the drum are arranged in axially spaced to the drying drum, provided on a plurality of exhaust ports that are shielded and the drying air blowing port by the guide plates It was made to discharge with a forced exhaust system That.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Since the material to be dried flows in the drying drum while swirling along the passage of the material to be dried by blowing dry air, the contact distance and the contact time with the dry air are long and a reliable drying process can be performed.
(2) Since the material to be dried is swirled along the spiral material flow path formed in the drying drum, even the materials to be dried having different shapes and masses can smoothly flow and be dried. it can.
(3) Since the drying air is blown into the plurality of drying air blowing ports formed in the drying drum and the humidified air is exhausted by the plurality of forced exhaust devices, the inside of the drying drum is maintained in a dry state. Thus, the drying efficiency can be increased.
(4) The dry air blowing port is positioned in the tangential direction of the drying drum and is positioned in the drying object passage so that the dry air smoothly flows along the drying object passage. Drying efficiency is good because it smoothly swirls and flows in the dry matter passage.
(5) Since the obstacle material is protruded at an appropriate position in the passage to be dried, and the mass to be dried is unwound, the material to be dried is separated and can be surely dried.
(6) The dry air blown out from the dry air blowing port is swung 270 degrees in the circumferential direction in the drying drum and then discharged to the outside by the forced exhaust device. Can be made.
(7) Since during the drying air blowing port and the exhaust port guide plate is shielded, since no drying air blown is forcibly exhausted immediately from the exhaust port, be accomplished effectively drying effect it can.

It is a front view of the airflow drying apparatus which concerns on embodiment of this invention. It is a rear view of an airflow drying apparatus. It is a right view of an airflow drying apparatus. It is the top view which fractured | ruptured a part which shows the internal structure of an airflow drying apparatus. It is a VV arrow direction sectional view in FIG. It is explanatory drawing of a drying process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, 1 is an air flow drying device, 2 is a drying drum made of steel plate constituting the air flow drying device 1, and the drying drum 2 closes a cylindrical body portion 2A and one end side in the axial direction of the body portion 2A. and one side end plate 2B which, by the other side end plate 2C which closes the axial end of the body portion 2A, for example, a length of about 6,000 mm, Yes and formed in a cylindrical body having a diameter of about 2,500 mm, not shown Ru der of a fixed type to be installed in washing and drying factories. Reference numeral 3 denotes a rectangular inlet formed on one end side of the body portion 2A in the axial direction. A rectangular tube inlet duct 3A projects laterally along the tangent to the inner peripheral surface 2D of the body portion 2A. It is. Reference numeral 4 denotes a rectangular discharge port formed on the other axial end of the body portion 2A, and a rectangular tube discharge duct 4A projects laterally along the tangent to the inner peripheral surface 2D of the body portion 2A. It is.

  Reference numeral 5 denotes a spiral to-be-dried material passage formed from the inlet 3 to the outlet 4 along the inner peripheral surface 2D of the drying drum 2. The to-be-dried material passage 5 has a height of about 200 mm on the inner peripheral surface 2D. The guide plate 5A is provided in a spiral shape so as to have a substantially cross-sectional shape. 6, 6, and 6 indicate three obstacles made of a metal round bar provided at a position on the upper side of the inner peripheral surface 2 </ b> D in a state of projecting into the dried object passage 5. Each obstacle 6 is for reliably drying each to-be-dried object M by collapsing the lump-like to-be-dried object M flowing through the to-be-dried object passage 5, collapsing and falling down. It is.

  .. Are a plurality of dry air blowing ports for blowing dry air into the drying drum 2, and each of the dry air blowing ports 7 is disposed in the body portion 2A so as to be spaced apart in the axial direction. And it is made to open to the to-be-dried material channel | path 5 along the tangent of inner peripheral surface 2D, and has comprised the substantially elliptical shape. Reference numeral 8 denotes a blower tube for blowing dry air into the drying drum 2. The blower pipe 8 is composed of a main pipe 8A disposed along the axial direction in the body 2A of the drying drum 2, and a distribution pipe 8B branched from the main pipe 8A and connected to the dry air blowing port 7. A hot air blower (not shown) is connected to the base end so that warm air of about 20 ° C. is blown into the drying drum 2 at a wind speed of about 30 m / sec.

  Reference numerals 9, 9,... Are a plurality of exhaust ports for releasing the humidified air in the drying drum 2 to the outside, and the exhaust ports 9 are spaced apart from the body 2A in the axial direction and open to the material passage 5 to be dried. Formed. Reference numeral 10 denotes a forced exhaust device fitted to each exhaust port 9. The forced exhaust device 10 is disposed in the drying drum 2 so as to be spaced apart in the axial direction, and the dry air blown into the drying drum 2 from the dry air blowing port 7 is rotated approximately three quarters in the drying drum 2. In other words, the body portion 2A is positioned so as to be sucked at a position rotated about 270 degrees in the circumferential direction. Since the dry air blowing port 7 and the forced exhaust device 10 are arranged apart from each other in the circumferential direction and are shielded by the guide plate 5, the dry air blown into the dry drum 2 is immediately forced into the forced exhaust device. 10 can be eliminated, and the dry air can be dried in sufficient contact with the material to be dried M during swirling, and the inside of the drying drum 2 can be exhausted as wet air. It can be kept dry.

Here, each forced exhaust device 10 is formed of a cylinder having a discharge port 11 </ b> A formed on the rear end side, and is connected to an intake cylinder 11 provided on the drying drum 2 while being fitted to the exhaust port 9, and a drive motor 12. A rotary shaft 13 that is rotationally driven in the intake cylinder 11, an intake fan 14 that is located in the intake cylinder 11 and provided on the rotary shaft 13, and that is provided on the distal end side of the rotary shaft 13 and in the drying drum 2. And a conical rotary filter 15 made of a perforated plate projecting from the outer surface of the rotary filter 15. A foreign matter wiper blade 16 is erected in a cross shape on the outer surface of the rotary filter 15.
In the forced exhaust device 10 having the above-described configuration, the intake cylinder 11 is fitted into the exhaust port 9 and attached to the inner peripheral surface 2D of the drying drum 2 via the spacer 17.

  The forced exhaust device 10 having the above-described configuration rotates the intake fan 14 and sucks humidified air in the drying drum 2 into the intake cylinder 11 through the rotary filter 15 and discharges it to the outside through the discharge port 11A. . At this time, by rotating the rotary filter 15 together with the intake fan 14, the suction efficiency is prevented from being lowered by using centrifugal force to remove the object to be dried from adhering to the rotary filter 15 by the suction force. Further, the foreign matter wiper blade 16 sucks out foreign matter and forms an air layer that swirls in front of the rotary filter 15 so as to suck only air having a specific gravity different from that of the foreign matter.

  The present embodiment has the above-described configuration, and the operation thereof will be described next. Hot air of about 20 ° C. is blown into the drying drum 2 from the hot air blower through the blower tube 8 at a wind speed of about 30 m per second. The dry air blown from the plurality of dry air blowing ports 7 flows along the to-be-dried object passage 5. In this state, the material to be dried M introduced into the drying drum 2 from the charging port 3 is reliably brought into contact with new dry air while swirling and flowing in the material passage 5 toward the downstream side by the wind pressure of the dry air. And is dried efficiently. The dried material M to be dried is discharged from the discharge port 4 by wind force and sent to the next process.

  The drying drum 2 according to the present embodiment has a length of about 6,000 mm, and the material to be dried M flows about 75,000 mm in the spiral material to be dried 5 during the drying process. Compared with the case where it does, it flows about 12 times the contact distance, and since it contacts with dry air during this flow, the to-be-dried object M can be dried more reliably.

  And the to-be-dried object M adhered by the surface tension of moisture collides with the obstacle material 6 provided in the to-be-dried object passage 5 and is unraveled, so that each separated to-be-dried object M is surely obtained. Can be dried.

  Further, since the dry air blown from the dry air blowing port is discharged to the outside by the forced exhaust device at a position rotated 270 degrees in the circumferential direction in the drying drum, the object to be dried can be sufficiently brought into contact with the dry air. . The dry air blowing port 7 and the forced exhaust device are separated from each other at a position rotated 270 degrees in the circumferential direction in the drying drum, and the guide plate 5A is shielded between them, so that the blown dry air is blown out. Can be effectively dried without being forced to exhaust immediately.

  In addition, the numerical values regarding the dimensions of the drying drum 2 and the guide plate 5A, the temperature of the drying air, and the wind speed shown in the embodiment of the present invention are examples, and the present invention is not limited to these numerical values.

DESCRIPTION OF SYMBOLS 1 Airflow drying apparatus 2 Drying drum 2A Body part 2D Inner peripheral surface 3 Input port 4 Outlet port 5 To-be-dried material channel | path 5A Guide board 6 Obstacle material 7 Dry air blowing port 8 Air blower 9 Exhaust port 10 Forced exhaust system

Claims (4)

A cylindrical fixed-type drying drum having an inlet at one end in the axial direction and a outlet at the other end, and a guide plate spirally provided on the inner peripheral surface of the drying drum, discharge from the inlet. A spiral to-be-dried material passage formed over the outlet, an obstacle for unraveling the to-be-dried material projecting at an appropriate position of the to- be-dried material passage, and an axially separated body of the drying drum. A plurality of dry air blowing ports formed in the above, a blower pipe connected to each dry air blowing port, and a body portion of the drying drum spaced apart in the axial direction, and the dry air by the guide plate An airflow drying device comprising a plurality of exhaust ports that are shielded from an air inlet and a forced exhaust device provided at each of the exhaust ports.   2. The air flow drying device according to claim 1, wherein the dry air blowing port is formed in a tangential direction of the drying drum and located in the drying object passage.   2. The air flow drying according to claim 1, wherein the forced exhaust device is disposed at a position where the dry air blown from the dry air blowing port is rotated 270 degrees in the circumferential direction in the drying drum. apparatus. In a fixed drying drum in which a spiral material passage is formed by a guide plate spirally provided on the inner peripheral surface from an inlet port on one axial end side to a discharge port on the other end in the axial direction. The drying air is blown from a plurality of drying air blowing ports formed in a tangential direction of the drying drum , and the drying air is swirled 270 degrees in the circumferential direction in the drying drum, thereby The material to be dried in the drying drum is swirled along the material passage to be dried , and is dried while being removed by an obstacle projecting at an appropriate position of the material to be dried, and the humidified air in the drying drum is An airflow drying method in which the air is exhausted by a forced exhaust device provided at a plurality of exhaust ports arranged on the drying drum so as to be axially separated from each other and shielded from the dry air blowing port by the guide plate .

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