JP5227076B2 - Hot air dryer - Google Patents

Description

  The present invention relates to a hot air dryer for drying by blowing hot air while mechanically stirring mud containing water.

  If drying can be performed using hot air of waste heat from the factory in the step of drying the mud by blowing hot air to the water-containing mud, energy can be saved by effectively using the waste heat. However, the exhaust heat hot air has a low pressure. It is necessary to efficiently dry the low-pressure hot air so that it can be effectively performed. For this reason, a method of spraying hot air on the mud while mechanically stirring the mud can be considered. According to this method, the mud that is mechanically agitated and the hot air blown to the mud are mixed well, so that drying can be performed efficiently.

Here, the configuration of the stirring mechanism of the kneading apparatus previously proposed by the present applicant can be used as the configuration of the stirring mechanism for mechanically stirring the mud (see Patent Documents 1 and 2). The kneading apparatus stirs and kneads a mixture of a powdery substance and a liquid. As a configuration of the agitation mechanism, the agitation mechanism has two rotation shafts installed in parallel with each other, and a plurality of agitation members such as rods and paddles are erected on the outer peripheral surfaces of the rotation shafts. Then, by rotating the two rotating shafts in opposite directions, the respective stirring members stir the mixture of the powdery substance and the liquid and knead them while conveying them in the axial direction of the rotating shaft. At that time, the agitating members of the two rotating shafts can also be configured to perform so-called self-cleaning, in which the kneaded material adhering to the outer peripheral surface of the mating rotating shaft and the agitating member is scraped off. If the structure of the stirring mechanism of this kneading apparatus is used, stirring can be carried out without any trouble even with highly adherent mud.
JP-A-10-277376 JP 2006-239554 A

  The present invention has been made in consideration of the above circumstances. An object of the present invention is a hot air dryer that blows hot air while drying mud containing moisture mechanically, and can efficiently dry mud with hot air, and is effective even with low-pressure hot air It is in providing the structure of the hot air dryer which can be carried out. More specifically, the configuration of the stirring mechanism of the kneading apparatus described above is used, and a configuration is provided that can efficiently dry mud by appropriately supplying hot air, blowing, and exhausting air. .

In order to solve the above problems, the hot air dryer according to the present invention is:
A hot air dryer for drying by blowing hot air while mechanically stirring water-containing mud,
In the lower part of the casing of the dryer, a plurality of rotating shafts that are provided with a plurality of stirring members on the outer peripheral surface are laid in parallel or horizontally or parallel to each other in the width direction of the casing,
On the upper side of the housing, an exhaust duct portion that guides hot air exhaust having a lower open side and a hot air outlet formed at the upper end is provided so as to extend in the axial direction of the rotary shaft directly above the plurality of rotary shafts. With
The exhaust duct section is partitioned in the width direction of the casing, and the supply duct section for guiding the supply of hot air with a hot air inlet formed at the upper end is one side in the width direction of the casing with respect to the exhaust duct section One adjacent to each other or two adjacent to each of both sides, extending in the axial direction,
During drying of the mud, the mud put in the housing is conveyed in one direction while being stirred by the rotational drive of the plurality of rotating shafts,
Hot air is blown downward into the air supply duct portion from the hot air inlet, expands in the axial direction, and is blown obliquely downward onto the rotating shaft from the exhaust duct portion at the lower portion of the air supply duct portion to form mud Then, the inside of the exhaust duct is raised and discharged from the hot air outlet.

  According to the configuration of the hot air dryer according to the present invention, during the drying operation, the mud that is mechanically stirred and the hot air blown on the mud are well mixed, so that the drying can be performed efficiently. In particular, the stirring is not performed with hot air pressure but mechanically, so that drying with hot air can be performed efficiently.

  Further, the supply and exhaust of hot air can be performed smoothly by dividing the supply air into the supply air duct portion and the exhaust air duct portion without interfering with each other. Moreover, since the hot air is blown onto the rotating shaft, it is performed obliquely downward from the exhaust duct portion side at the lower portion of the air supply duct portion, so that it can be performed without any trouble. Further, since the hot air spreads in the axial direction of the rotating shaft in the air supply duct portion and is blown onto the rotating shaft, it can be uniformly blown in the axial direction of the rotating shaft. Also from these points, drying with hot air can be performed efficiently.

  Since drying can be performed efficiently in this way, it is possible to effectively dry mud using hot exhaust air with low pressure, and energy saving can be achieved using waste heat energy. Excellent effect is obtained.

  Hereinafter, embodiments of the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

  FIGS. 1-11 demonstrates the structure of the hot air dryer (henceforth only a dryer) of an Example. 1 to 4 show the entire dryer. 5 to 7 show the configuration on the lower housing 2 side that constitutes the lower portion (substantially lower half) of the entire housing of the dryer. 8 to 11 show the configuration on the upper housing 3 side that constitutes the upper portion (substantially the upper half) of the entire housing.

  In these drawings, the lower housing 2 is fixedly provided on the base frame 1. Then, the upper casing 3 is fixed and coupled on the lower casing 2 to constitute the entire casing of the dryer. The casings 2 and 3 are formed in a shape extending in the lateral direction in FIGS. Hereinafter, the horizontal direction in FIGS. 1 and 2 is referred to as a length direction of the casing (or an axial direction of rotating shafts 4 and 5 described later). Further, the horizontal direction in FIGS. 3 and 4, which is a direction orthogonal to the length direction of the casing, is referred to as the width direction of the casing.

  The configuration on the lower housing 2 side will be described. The upper side of the lower housing 2 is open, and the bottom surface is curved corresponding to the trajectory of paddles 41 and 51 of rotating shafts 4 and 5 described later (see FIGS. 4 and 7). In addition, inspection ports 22, 23, and 24 are formed on side surfaces along the length direction of the lower housing 2, and a detachable lid is provided on each of the inspection ports (see FIG. 1). Further, a discharge port 21 is formed below the right end portion of the lower housing 2 in FIG. 1 and FIG.

  The lower casing 2 has one axial direction of the rotating shafts 4 and 5 (FIG. 5) while stirring the mud to be dried (hereinafter simply referred to as mud) by rotating the rotating shafts 4 and 5. , 6 in the right direction) is provided.

  The rotating shafts 4 and 5 are arranged in parallel with each other in the width direction of the casings 2 and 3 in the lower casing 2 and parallel to each other along the length direction of the casings 2 and 3. Instead of being strictly horizontal, it may be installed substantially horizontally. Both end portions of the rotating shafts 4 and 5 protrude outside the lower housing 2 and are rotatably supported by bearings 6 to 9 fixed outside the lower housing 2. Gears 10 and 11 are fixed to the left ends of the rotating shafts 4 and 5 in FIG. 5 and mesh with each other. Further, a sprocket 12 is fixed to the left end of the rotating shaft 4.

  On the other hand, a motor 13 is fixed on the frame 1 outside the lower housing 2 as a drive source for rotating the rotary shafts 4 and 5. The rotational driving force of the motor 13 is transmitted to the rotary shaft 4 via the speed reducer 14, the sprocket 15, the chain 16 and the sprocket 12. Thereby, the rotating shaft 4 is rotationally driven as a driving shaft. Further, the rotational driving force is transmitted to the rotary shaft 5 through the gears 10 and 11, whereby the rotary shaft 5 is driven by the rotary shaft 4 as a driven shaft and rotates in the reverse direction.

  A plurality of paddles 41 are erected on the outer peripheral surface of the rotating shaft 4 and a plurality of paddles 51 are erected on the outer peripheral surface of the rotating shaft 5 as stirring members for stirring the mud. The paddles 41 and 51 are the same as each other, and rectangular plate-like fixing portions 41b and 51b are vertically formed at the base end portions of the rectangular plate-like wing portions 41a and 51a. And the fixing | fixed part 41b, 51b is fixed to the outer peripheral surface of the rotating shafts 4 and 5 with a screw | thread etc.

  In this embodiment, as the rotary shafts 4 and 5 rotate, the plurality of paddles 41 and 51 scrape off the muddy substances adhering to the outer peripheral surfaces of the mating rotary shafts 5 and 4 and the paddles 51 and 41. Configure to do. For this reason, in this embodiment, the arrangement of the paddles 41 and 51 is configured as follows.

  Two or one paddle 51 is provided at a predetermined equal distance in the axial direction of the rotating shaft 5 (the length direction of the casing). Specifically, basically, the two pieces are arranged along two spiral lines that are parallel to each other, and are arranged at an angular pitch of 72 ° that divides 360 ° of the entire circumference into five equal parts in the circumferential direction. (See FIG. 7). However, one paddle 51 is disposed only on one spiral line every third place from the left end in FIG. That is, two, two, and one sheet are repeatedly arranged at the predetermined distance from the left end. However, the right end ends with two or two.

  The wing portion 51 a of the paddle 51 is inclined at a predetermined angle (for example, 45 °) with respect to the axial direction of the rotating shaft 5. And the direction of the inclination of the wing | blade part 51a is a direction which presses a mud in the positive direction (right direction in FIG. 5) of a conveyance direction with the rotation of the rotating shaft 5 in the place of the arrangement | positioning of every 2 sheets. It has become. On the other hand, in the place of the above-mentioned arrangement of one sheet at a time, it is the direction of pressing in the reverse direction (left direction) of the transport direction.

  Each paddle 41 basically has a predetermined equidistant pitch in the axial direction of the rotary shaft 4 along the two parallel spiral lines and at a predetermined angular pitch in the circumferential direction, like the paddle 51. They are arranged side by side. However, the winding direction of the spiral line is opposite to the direction of the spiral line of the paddle 41. The angular pitch in the circumferential direction is a 90 ° pitch that divides the entire circumference into four equal parts (see FIG. 7). Further, it is the same as the paddle 51 to arrange two sheets, two sheets, and one sheet (the directions are normal, normal, and reverse) at a predetermined distance from the left end. However, as an exception, the left end is one and the direction is positive.

  Note that the distance between the paddles 41 and 51 spaced apart in the axial direction of the rotary shafts 4 and 5 is equal, and the paddles 41 and 51 are disposed at positions facing each other in a direction perpendicular to the axial direction. Further, the rotary shafts 4 and 5 are arranged so as to be separated from each other so that the tips of the paddles 41 and 51 come close to the outer peripheral surfaces of the opposing rotary shafts 4 and 5 as the rotary shafts 4 and 5 rotate.

  The rotating shafts 4 and 5 are rotated at unequal speed. The rotational speed ratio per unit time of the rotary shafts 4 and 5 (ratio of the reciprocal of the gear ratio of the gears 10 and 11) is the ratio of the angular pitch, here 90 °: 72 °, that is, 5: 4. With such a configuration, self-cleaning can be performed without hindrance. Further, the helical pitch formed by the paddles 41 and 51 has an inverse ratio to the rotational speed of the rotating shafts 4 and 5, that is, 1: 1.25, and the conveying speed in the axial direction of the rotating shafts 4 and 5 is the same. can do.

  Needless to say, the arrangement of the paddles 41 and 51 is not limited to the above. The spiral line on which the paddles 41 and 51 are arranged may be only one or three or more. The ratio of the angular pitch and the rotation speed ratio are not limited to 5: 4. Generally speaking, N may be set to an integer of 2 or more and N: N-1. The ratio and arrangement of mixing paddles in the direction corresponding to the reverse direction of the transport direction, the ratio and arrangement of the places where the number of sheets is reduced, are not limited to the above.

  Further, the stirring member is not limited to the plate-shaped paddle, and for example, a round rod-shaped rod or the like may be used.

  Next, the configuration on the upper housing 3 side will be described. As shown in the cross-sectional view of FIG. 4, the upper housing 3 is divided into three spaces in the width direction of the housing by inner plates 33 and 33. That is, it is divided into a central exhaust duct portion 31 and air supply duct portions 32 and 32 adjacent to the left and right sides in the width direction of the casing. The exhaust duct portion 31 guides hot air exhaust, and the air supply duct portions 32 and 32 guide hot air supply.

  The exhaust duct portion 31 has the same width as that of the lower housing 2 and is open on the lower side, and is disposed directly above the lower housing 2, that is, directly above the rotation shafts 4 and 5. The space in the exhaust duct 31 communicates with the space in the lower housing 2 as it is.

  The exhaust duct portion 31 and the air supply duct portions 32 and 32 extend along the axial direction of the rotation shafts 4 and 5.

  Also, as shown in FIGS. 1 to 3 and the like, hot air inlets (air supply ports) 321 from which hot air such as exhaust heat from an external factory is blown into the upper surfaces (upper ends) of the air supply duct portions 32 and 32. Is provided. A hot air outlet (exhaust port) 311 is provided on the upper surface (upper end) of the exhaust duct portion 31 for exhausting hot air that has been used to dry the mud and the temperature has decreased.

  The exhaust duct 31 is provided with inspection ports 312 and 313 for inspection on the upper surface and the right side surface in FIG. The air supply duct portions 32, 32 are also provided with inspection ports 322, 323 on the left and right side surfaces in FIG. 1, and further, cleaning ports 324, 325 for cleaning the air supply duct portion 32 are provided on the lower surface. Yes. All these mouths are provided with detachable lids, which can be inspected or cleaned by removing the lids, and can be sealed by attaching lids.

  Further, as shown in FIG. 11, an inlet 314 is formed on the left side surface of the exhaust duct portion 31 in FIG. The tip of the mud throwing device 50 is inserted into the charging port 314 as shown by a one-dot chain line in FIGS. Then, the mud is introduced into the casing in a state where the inlet 314 is sealed with a seal structure (not shown). The reason for performing the sealing is to prevent dangers such as burns caused by blowing hot air.

  On the other hand, as shown in FIG. 10, when viewed from the exhaust duct portion 31 side toward the air supply duct portion 32 side, the lower portion of the inner plate 33 (the exhaust duct portion 31 side below the air supply duct portion 32) A plurality of flanged nozzle connection ports 34 are provided so as to slightly protrude toward the exhaust duct portion 31 side. A plurality of nozzle connection ports 34 are provided in a staggered manner in two upper and lower rows at intervals in the length direction of the housing. In addition, the interval in the longitudinal direction of the casing is large at a plurality of locations (here, three locations) in two rows of the plurality of nozzle connection ports 34. As a result, the plurality of nozzle connection ports 34 are divided into a plurality of (here, four) groups in the length direction of the casing.

  As shown in FIGS. 4, 8, and 9, the nozzle 35 is connected to each of the nozzle connection ports 34. The nozzles 35 are respectively for guiding hot air from the lower part of the air supply duct part 32 obliquely downward and blowing it on the rotating shafts 4 and 5 in the lower housing 2 to dry the mud. The nozzle 35 is bent substantially in a “h” shape, and the diameter decreases from the proximal end portion to the distal end portion. The nozzle 35 is connected to the nozzle connection port 34, passes through the lower part of the exhaust duct portion 31, and has a height at which the tip does not hit the paddles 41, 51 above the rotary shafts 4, 5 in the lower housing 2. It is arranged to face the position. Each nozzle 35 is connected to each nozzle connection port 34 and is divided into a plurality of groups (here, four) in the length direction of the housing.

  On the other hand, a funnel-shaped partition member indicated by reference numeral 36 in FIG. 1, FIG. 4, FIG. 8, and FIG. The partition member 36 is composed of a plurality of swingable plate members. Here, as shown in FIG. 4, the partition member 36 is formed by connecting three sets of two plate members connected to each other in a vertical direction via a hinge 36 a so as to be swingable in the horizontal direction and swinging the upper end with a hinge shaft 37. It is constructed as a set of six pieces of goodwill supported in a movable manner. The two plates connected in the vertical direction can be folded at the hinge 36a. Both end portions of the hinge shaft 37 are fixed at predetermined height positions near the upper portions of the inner plates 33, 33 on both sides in the width direction of the casing. The direction of the hinge shaft 37, that is, the width (lateral) direction of the partition member 36 is along the width direction of the housing. The overall width of the plate member portion of the partition member 36 is slightly smaller than the inner width of the exhaust duct portion 31.

  In addition, the partition member 36 is provided in a plurality of positions (here, four positions) in the exhaust duct portion 31 in the length direction of the casing (the axial direction of the rotation shafts 4 and 5). With this arrangement, a plurality of spaces in the space inside the exhaust duct portion 31 that are equal to or lower than a predetermined height (height of the hinge shaft 37) between the heights of the exhaust duct portion 31 in the length direction (rotation axis direction) of the housing. It is divided into (here five).

  In addition, the partition member 36 is disposed so as to hang down at a position where the groups of the nozzles 35 are spaced apart from each other and at a position near the end group on the discharge port 21 side so as not to hit the nozzles 35.

  When the dryer is inspected, the inspector does not get in the way by folding a set of six plates of the partition member 36 at the hinge 36a or rotating the hinge shaft 37 to a desired angle. Can be.

  Of course, the number of the plate members constituting the partition member 36 may be a plurality of plates other than two and three, respectively. It is also conceivable that one of the vertical and horizontal sides is one and the other is a plurality. Further, depending on the specifications of the dryer, it is conceivable to provide the partition member 36 only at one place. It is also conceivable to arrange the partition member 36 so that the space in the exhaust duct portion 31 is divided into a plurality of spaces in the width direction of the housing.

  Next, operation | movement of the dryer of an Example is demonstrated. During the drying operation, a mud (not shown) is sequentially put into the left end portion of the exhaust duct portion 31 of the upper housing 3 in FIGS. The introduced mud falls into the left end of the lower housing 2. At the same time, the motor 13 is turned on and driven, and the rotary shafts 4 and 5 rotate in opposite directions as indicated by arrows in FIGS. Further, hot air such as exhaust heat from the factory is blown into the air supply duct portions 32 and 32 from the hot air inlets 321 and 321, respectively. The hot air is assumed to have a relatively low pressure of, for example, a temperature of about 350 ° C. and an atmospheric pressure of about 350 mmAq.

  The mud that has fallen into the left end in FIG. 5 of the lower housing 2 is stirred by the paddles 41 and 51 of the rotating rotating shafts 4 and 5. In addition, the paddles 41 and 51 arranged by repeating two, two, and one from the left side are pressed to the right by the set of two, and are pressed to the left by the set of one. As a result, although the mud stays a little in one set, it is sequentially conveyed rightward toward the discharge port 21 along the axial direction of the rotating shafts 4 and 5 as a whole. Stirring can be sufficiently performed by stagnating at one set.

  Here, the rotating shafts 4 and 5 are rotating at an unequal speed with a rotation ratio of 5: 4. For this reason, the paddles 41 and 51 facing each other at the same position in the axial direction of the rotating shafts 4 and 5 repeatedly move toward and away from each other with the rotation of the rotating shafts 4 and 5, and are mud attached to each other. Scrap off things. Since the rotation speed ratio and the above-described angular pitch of the paddles 41 and 51 are the same, the paddles 41 and 51 do not collide with each other. Further, as the rotary shafts 4 and 5 rotate, the paddles 41 and 51 have their tips passing through the vicinity of the outer peripheral surfaces of the counterpart rotary shafts 5 and 4. For this reason, if a muddy substance adheres to the outer peripheral surface of the rotating shafts 4 and 5 to a certain thickness or more, it can be scraped off by the paddles 51 and 41. In this way, self-cleaning can be performed.

  On the other hand, the hot air blown downward into the air supply duct portions 32 and 32 from the hot air inlets 321 and 321 respectively extends in the axial direction within the air supply duct portions 32 and 32 extending in the axial direction of the rotary shafts 4 and 5. spread. Then, the air is blown obliquely downward through the nozzles 35 from the nozzle connection port 34 on the exhaust duct portion 31 side at the lower portion in the air supply duct portions 32, 32, and the rotating shafts 4, 5 are formed at the upper portion in the lower housing 2. Sprayed on top.

  Here, corresponding to the arrangement of the plurality of nozzles 35, hot air is blown onto the rotary shafts 4 and 5 at each of a plurality of positions arranged in the axial direction of the rotary shafts 4 and 5. As a result, hot air is blown and mixed with the mud that is being stirred in each of the paddles 41 and 51 of the rotating shafts 4 and 5, so that the mud is sequentially dried and granulated. The hot air used for drying is pushed up by subsequent hot air blown sequentially thereafter, rises from the lower housing 2 through the exhaust duct portion 31, and is discharged from the hot air outlet 311.

  Here, a direction along the axial direction of the rotary shafts 4 and 5 in a space within a range from the lower end to the upper end of the partition member 36 in the exhaust duct portion 31 by the partition of the plurality of partition-like partition members 36. The movement of hot air to is restricted. For this reason, the hot air after being used for drying is smoothly guided upward and discharged from the hot air outlet 311. The temperature of the discharged hot air has decreased to, for example, about 120 ° C. in the process so far.

  In addition, the height of the hinge shaft 37 at the upper end of the partition member 36 is much lower than the height of the ceiling of the exhaust duct portion 31. Above the height of the hinge shaft 37, the partition member 36 does not restrict the movement of hot air in the direction along the axial direction of the rotary shafts 4 and 5. For this reason, the exhaust of hot air from the hot air outlet 311 is not hindered even from a position away from the hot air outlet 311 in the axial direction of the rotary shafts 4 and 5 in the exhaust duct portion 31.

  In this manner, the muddy material is sequentially conveyed in the right direction in FIG. 6 while being stirred by the paddles 41 and 51 and dried by hot air, and is granulated and dropped into the discharge port 21 at the right end portion of the lower housing 2. Discharged.

  The discharged processed material is conveyed to a device (not shown) that performs the next processing. By appropriately adjusting the conveyance timing and conveyance amount at this time, the processed material is always appropriately stored under the discharge port 21 so that the discharge port 21 is hermetically sealed.

  According to the present embodiment as described above, since the mud is dried by blowing hot air while mechanically stirring, the mud and hot air are well mixed and drying can be performed efficiently. That is, a higher drying efficiency can be obtained than heat transfer drying in which drying is performed only by heat conduction. In particular, since the stirring is not performed with hot air pressure but mechanically, drying can be performed efficiently using low-pressure hot air.

  Further, the supply and exhaust of hot air can be performed smoothly without being interfering with each other by dividing the supply air into the supply air duct 32 and the exhaust air duct portion 31. Furthermore, hot air can be smoothly exhausted by the action of the partition member 36. Further, since the hot air is blown from the air supply duct portion 32 onto the rotating shafts 4 and 5 through the nozzle 35, it can be effectively performed without interfering with the hot air exhaust airflow in the exhaust duct portion 31. it can. Moreover, since hot air is blown through the air supply duct portion 32 and the plurality of nozzles 35 at a plurality of positions aligned in the axial direction of the rotary shafts 4 and 5, hot air can be blown substantially uniformly along the axial direction. it can. Also from these points, drying with hot air can be performed efficiently.

  Accordingly, it is possible to effectively dry the mud using the exhaust heat hot air having a relatively low pressure, and it is possible to save energy using the energy of the exhaust heat.

  In addition, since the self-cleaning is performed in the stirring by the paddles 41 and 42 of the rotating shafts 4 and 5, stirring can be performed without any trouble even in a highly adherent mud.

  In the embodiment described above, the two air supply duct portions 32 are provided adjacent to both sides of the exhaust duct portion 31 in the width direction of the casing. However, only one side in the width direction of the casing is provided. Only one may be provided adjacent to.

  In addition, at least a part of the air supply duct portion 32 may be formed in a tubular shape separate from the housing.

  Further, the number of rotating shafts 4 and 5 is not limited to two, and other plural shafts such as four or six may be provided.

It is a side view along the length direction of the housing | casing of the hot air dryer by the Example of this invention. It is a top view of the dryer. It is a side view of the right side in FIG. 1 of the dryer. It is sectional drawing along the AA line of FIG. It is a cross-sectional top view which shows the structure by the side of the lower housing | casing of the dryer. It is a vertical side view along one rotating shaft 4 on the lower housing side of the dryer. It is sectional drawing along the BB line in FIG. It is a cross-sectional top view of the upper housing | casing of the dryer. It is a vertical side view in the width direction center part of the upper housing | casing of the dryer. It is the side view of the air supply duct part seen toward the inner side board of the upper housing | casing of the dryer. FIG. 10 is a left side view of the upper casing of the dryer in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Lower housing 3 Upper housing 4, 5 Rotating shaft 6-9 Bearing 10, 11 Gear 12, 15 Sprocket 13 Motor 14 Reducer 16 Chain 21 Discharge port 22-24 Inspection port 31 Exhaust duct unit 32 Air supply duct Portion 33 33 Inner plate 34 Nozzle connection port 35 Nozzle 36 Goodwill partition member 36a Hinge 37 Hinge shaft 41, 51 Paddle 50 Mud throwing device 311 Hot air outlet 312, 313 Inspection port 314 Mud throwing port 321 Hot air inlet 322 , 323 Inspection port 324,325 Cleaning port

Claims (6)

A hot air dryer for drying by blowing hot air while mechanically stirring water-containing mud,
In the lower part of the casing of the dryer, a plurality of rotating shafts that are provided with a plurality of stirring members on the outer peripheral surface are laid in parallel or horizontally or parallel to each other in the width direction of the casing,
On the upper side of the housing, an exhaust duct portion that guides hot air exhaust having a lower open side and a hot air outlet formed at the upper end is provided so as to extend in the axial direction of the rotary shaft directly above the plurality of rotary shafts. With
The exhaust duct section is partitioned in the width direction of the casing, and a hot air inlet is formed at the upper end to guide the supply of hot air, and the supply duct section is only on one side in the width direction of the casing with respect to the exhaust duct section. One adjacent to each other or two adjacent to each of both sides, extending in the axial direction,
During drying of the mud, the mud put in the housing is conveyed in one direction while being stirred by the rotational drive of the plurality of rotating shafts,
Hot air is blown downward into the air supply duct portion from the hot air inlet, expands in the axial direction, and is blown obliquely downward onto the rotating shaft from the exhaust duct portion at the lower portion of the air supply duct portion to form mud The hot air drier is characterized in that it is then dried and then exhausted from the hot air outlet.   Along with the rotation of the plurality of rotating shafts, the plurality of stirring members of the plurality of rotating shafts are configured to scrape off muddy matters adhering to the outer peripheral surface of the partner rotating shaft and the stirring member. The hot air dryer according to claim 1, wherein   A plurality of nozzles are provided side by side in the axial direction through the inside of the exhaust duct part from the exhaust duct part side of the lower part of the air supply duct part, with the tip facing the rotation axis. The hot air dryer according to claim 1 or 2, wherein hot air is blown obliquely downward onto the rotating shaft through the plurality of nozzles.   A funnel-shaped partition member composed of a plurality of swingable plate members is provided so as to hang down at least at one location in the exhaust duct portion, whereby the space in the exhaust duct portion is partitioned into a plurality of spaces. The hot air dryer according to any one of claims 1 to 3, wherein the hot air dryer is characterized by the following.   The said goodwill-shaped partition member is arranged so that a space below a predetermined height in the middle of the height of the exhaust duct portion in the space in the exhaust duct portion may be partitioned into a plurality in the axial direction. 4. A hot air dryer according to 4.   In the funnel-shaped partition member, a plurality of plate members are connected to each other in a vertically swingable manner via hinges, and the plurality of plate members connected in the vertical direction can be folded at the hinges. The hot-air dryer according to claim 4 or 5, wherein the hot-air dryer is configured to be able to perform.

Images