JP2003042657A - Rotary drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge an article to be dried in a rotary drier by keeping the degree of dryness of the article intact while preventing the article from being scattered. SOLUTION: A mechanism having discharge action in reverse rotation is provided in a drying drum, and in a process where an article to be dried is discharged, the drying drum is reversely rotated. An article to be dried and a dried article are prevented from scattering upon throwing and discharging thereof, a plurality of the drums are provided continuously, and a predetermined relationship is provided among the direction of rotation, time, and speed of each drum to reduce the play of the actuation of each drum and henceforth improve the efficiency as a whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for easily and surely discharging a dried material while making the drying degree of the dried material uniform.

[0002]

2. Description of the Related Art A material to be dried is a drying drum (hereinafter referred to as "drum").
Say. ), The drum is rotated and the dryer is used to dry while sending hot air.For example, the morphology and characteristics of the material to be dried, such as fluidity, disintegration, specific gravity, particle size, water content, slow drying speed, and drying An optimum drying drum has been designed by determining the diameter and length of the drum according to the amount of material. In a conventional rotary dryer, a drum having a transfer outer lifter (16) provided on a cylindrical outer cylinder (11) as shown in FIG. 4 is horizontally placed and rotated only in one direction to dry an object to be dried. In this case, a screw type discharge mechanism is provided around the rotation center axis of the drum as needed to discharge the product, a model in which the drum is inclined to facilitate discharge of the dried product, or a drum when drying. The type that is horizontal and ejects by tilting the drum while keeping the rotation while ejecting has been used. However, these methods and devices have the following problems.

A type in which a horizontal drum is rotated only in one direction to dry an object to be dried and a screw type discharging mechanism is provided to continuously discharge the object is suitable for a large amount of the object to be dried. However, the length of the drum is long and a separate discharge device is required, which results in high installation costs.

There is a type in which the drum is inclined in order to facilitate the discharge of the dried material. In this case, if the drying time of the material to be dried is constant, the discharging process can be automated easily. When the morphology or characteristics of the material to be dried is indefinite or fluctuates, it is difficult and complicated to control the control system to discharge the material to be dried while keeping the dryness constant.

The type in which the material to be dried is dried with the drum in a horizontal state and the drum is tilted while the rotation is kept at the time of discharging to discharge the material by shortening the drying time according to the form and characteristics of the material to be dried. Although the dryness can be controlled to be constant, an additional device for tilting is required because the drum must be tilted during discharge. In particular, in the case of a drying device in which hot air is blown not only from the inside of the drum but also from the outside, there is a problem in that the tilting mechanism must have heat resistance and the cost of the device becomes expensive.

[0006]

The present invention was devised under the circumstances described above, and has a mechanism (hereinafter referred to as "drum reverse rotation") which has a function of discharging dried matter during reverse rotation of the drum. "Time-draining mechanism") is provided as a part of the drum built-in mechanism, and when discharging, the drum is rotated in the reverse direction to discharge the dried material, and the dried / dried material is input / discharged without being scattered. Equipment,
By providing a plurality of drying drums having a discharge mechanism during reverse rotation of the drums and controlling them in accordance with the form and characteristics of the material to be dried, the rotation direction, time, and speed of each of the drying drums are controlled under a preset relationship. It is an object of the present invention to provide a method for efficiently drying and discharging a dried product.

[0007]

In order to solve the above problems, the present invention takes the following technical means.

According to the invention described in claim 1 of the present application, in a rotary type drying drum for rotating and drying an object to be dried, only rotation is performed in one direction of rotation (hereinafter referred to as "forward rotation"), and reverse rotation is performed. It is characterized in that the dried product can be easily discharged by operating a mechanism having a discharging function at times. As a result, regardless of the length of the drying time, it is possible to discharge the dried material at any time by rotating the drum in the reverse direction when discharging is necessary.

The invention as set forth in claim 2 of the present application is characterized in that the lifter, which is a mechanism for discharging during reverse rotation, is capable of raising the dried product to a higher position during reverse rotation than during forward rotation. And Bending is generally used for the structure, but in that case, it can be integrated with a lifter, which is a mechanism that operates at the time of forward rotation, or a simple structure close to it, which simplifies the structure and reduces the manufacturing cost. Can be realized. In this case, the ratio between the reverse-rotating action lifter and the normal-rotating mechanism is determined by the form and characteristics of the material to be dried.

According to a third aspect of the present invention, in a drying drum which discharges a dried product at the time of reverse rotation, the mechanism according to claim 2 is a fixed type mechanism having a discharging action at the time of reverse rotation of the invention of the first aspect. Is provided.

The invention described in claim 4 of the present application is
The drying drum according to claim 3 is provided with a mechanism for preventing the material to be dried and the dried material from being scattered during charging and discharging.

Further, in the invention described in claim 5 of the present application, in a drying device provided with a plurality of drying drums provided with a mechanism for discharging dried matter at the time of reverse rotation, the rotation direction, time and speed of each drying drum are It is controlled under a fixed relationship that is set in advance, and although it is a batch process, it continuously dries the material to be dried.
Characterized by transfer and discharge.

[0013]

1 to 3 show an embodiment of the invention corresponding to claims 1 to 4 of the present invention. End plates (2) are fixed to both ends of the outer cylinder (1) of the drum by welding or the like, and a partitioning member (3) having a U-shaped or L-shaped cross section is attached to the inside of the outer cylinder. Both ends thereof are fixed by end plates. A forward rotation action lifter (4) and a reverse rotation action lifter (5) are attached to the partition member, and further, a transfer rib (6) is attached as necessary. Each member may be attached by a method such as rivets, welding, brazing, etc., which is strong against heat and has a strong fixing strength. The material of each component is the characteristics of the material to be dried,
In particular, it is selected in consideration of corrosion resistance and heat resistance.

The cross section of the partitioning material (3) attached also to reinforce the outer cylinder (1) has a U shape or a L shape, but the bending angle does not have to be a right angle, and the shape of the material to be dried It is possible and desirable to match the characteristics and the drying speed. Further, the mounting angle of the partitioning material to the outer cylinder does not have to be parallel to the generatrix of the outer cylinder (1), and the partitioning material can be obliquely mounted to have a transfer action.

The lengths of the forward rotation action lifter (4) and the reverse rotation action lifter (5) are each 60 with respect to the drum length.
% To 90%, 40% to 10%, and selected in consideration of the form, characteristics, amount, etc. of the material to be dried. The reverse-rotating action lifter is bent in the height direction, that is, at a fixed position from the outer cylinder (1) to the drum center direction, as shown in FIG. The forward-rotating action lifter may be bent in the same manner as the reverse-rotating action lifter, but it is desirable that the bending directions thereof are opposite to each other. The bending angle in that case is not always the same for the forward rotation action lifter and the reverse rotation action lifter, but rather the shape / characteristics of the material to be dried / dried material, such as those with a high degree of dryness and small particle size It is desirable to change between the reverse rotation action lifter and the forward rotation action lifter in consideration of the fact that those that easily fall at the position) and that do not dry sufficiently fall only at a high angle (position). When a plurality of drums are incorporated in one device, the bending angle can be changed for each drum in consideration of the form and dryness of the material to be dried in each stage. Further, the end portion of the action lifter during normal rotation is cut off at both ends or one end as shown in FIG. 2 to prevent excessive accumulation of the material to be dried in the vicinity of the end plate (2) on the input side. It is also possible to ensure the separation of the dried material and the material to be dried at the boundary between the lifter and the counter rotation lifter at the time of drying. It should be noted that both members can be manufactured as separate members as shown in FIG. 2 and a part of them can be overlapped for use.

The material to be dried introduced from the input side (FIG. 1) is dried by being repeatedly scraped and dropped by the partitioning material (3) and the lifter (4) for normal rotation in the drum which rotates in the normal direction, It is transferred while being dried under the effect of the transfer rib (6). The direction and speed of the material to be dried can be controlled by the mounting angle of the transfer rib (Fig. 2), height, length, etc. It is determined in consideration of the length and rotation speed. The attachment of the transfer rib to the partition member (3) is performed at an angle shown by the broken line in FIG. 1 or 2 (hereinafter referred to as “the case of transfer rib attachment A”) and in the case of the alternate long and short dash line in FIG. In the case of the transfer rib attachment B ”). The height of the transfer rib is as low as about half the height of the lifter for normal rotation, and the length is almost the same as the range of action of the lifter for normal rotation. The distance from the end plate (2) on the discharge side is determined in consideration of the throughput, the morphological characteristics of the dried product, the length of the reverse rotation action lifter (5), and the like. In the case of the transfer rib attachment A, the transfer rib at the time of forward rotation functions to transfer the material to be dried to the input side. However, since the height of the transfer rib is lower than the height of the lifter at normal rotation, the lifter at normal rotation is used. Since the amount of the material to be dried flowing over is overwhelmingly large and the transfer is limited by the end plate (2) on the input side, the transfer action of the transfer rib to the input side is small. The action of discharging the dried product during reverse rotation is more remarkable than that. In the case of the transfer rib attachment B, an action of transferring the material to be dried to the discharge side during normal rotation is shown. Depending on the form and characteristics of the material to be dried, transfer rib attachment A and transfer rib attachment B
It is also possible to mix and, and the mixing ratio can be arbitrarily changed. The structure of the transfer rib may be the same as that of the lifter for normal rotation.

The transferred dried material is stored at the end of the drum on the discharge side (FIG. 1) which is not affected by the transfer rib (6), and when the drum is rotated in the reverse direction, the reverse rotation action lifter (5) is activated and discharged. It is discharged through the chute (7). As the chute on the input side, the same thing as the chute for discharging is used. In the case of the transfer rib attachment A, since the transfer rib has a function of transferring the material to be dried and the dried material to the discharge side during reverse rotation,
It is possible to perform the discharge processing even in a state where the inside of the drum is almost empty. On the other hand, in the case of the transfer rib attachment B, the transfer action of the transfer rib to the input side at the time of reverse rotation becomes more remarkable as the amount of the material to be dried / dried material decreases, and therefore, the operation is returned to the drying step again and dried. It can be discharged later and these can be repeated any number of times.

Since the reverse rotation action lifter (5) is provided on the discharge side separately from the forward rotation action lifter (4), the discharge chute (7) is slightly within the position range of the reverse rotation action lifter. By providing the lifter within the range of the action lifter at the time of forward rotation, it is possible to discharge only the dried material that has reached the predetermined discharge dryness.

Further, during reverse rotation, the material to be dried on the forward rotation action lifter (4) portion falls at a low position, whereas the dried material on the reverse rotation action lifter falls in the reverse rotation action lifter. The tip of the is bent so that it can raise the dried product to a higher position when it is rotated in the reverse direction than when it is rotated normally. To be made. During normal rotation, conversely, the dried material on the reverse rotation action lifter falls at a position lower than the drop position of the dried object on the normal rotation action lifter. This property means that when the left section of the drum in FIG. 1 is viewed as a clock dial and the uppermost part is set at 12 o'clock, the material to be dried starts to drop at about 2 o'clock and starts to drop at about 11 o'clock during normal rotation. On the other hand, it is shown that the dried product falls at the position of about 10 o'clock to about 1 o'clock during the reverse rotation. By utilizing this property, the position of the discharge chute (7) is set so as to be displaced from the falling position of the material to be dried on the action lifter at the time of forward rotation (Fig. 1), so that the dried material with a more uniform dryness can be obtained. In addition to the effect described in 0018 above, it can be discharged more reliably.

When the material to be dried is charged and the dried material is discharged,
There is a case in which the material to be dried / dried material may be spilled or blown off from the drum, the discharge chute (7), and the charging chute due to the rotation of the drum, hot air, etc. ) Is recommended to be installed on the input side and discharge side. In consideration of the fact that the drum is a rotating object, its structure is preferably that of a rotating body, and is preferably the conical cone type shown in FIG. Further, it is necessary to firmly fix the dissipation prevention device to the outer cylinder (1), but the fixing method may be one that can withstand rotation of the drum and does not generate vibration and can be easily attached and removed. It is suitable. The cone angle of the dissipation prevention device is determined in consideration of the inclination angle of the discharging chute.

In order to change the rotation direction of each drum, the connection of the three-phase motor may be changed, the time may be changed by changing the setting of the timer, and the change in speed may change the voltage / current or the number of poles of the motor. Just do it. A sequencer, personal computer, embedded computer, etc. are used to control all of them under a certain relationship. Further, the fixed relationship can be set in consideration of the form and characteristics of the material to be dried, the temperature and amount of hot air, and the like.

The drum of the present invention was provided continuously in four stages and controlled as follows. Assuming that the first-stage drum is a one-stage drum and the last-stage drum is a four-stage drum, while the four-stage drum is rotated in the reverse direction and the other drum is put in the forward rotation drying process, When the multi-stage drum enters the drying process, only the 3-stage drum is transferred to the discharging process. Similarly, by transferring the discharging process to the second stage and the first stage, the material to be dried can be efficiently dried and discharged into a dried material having an appropriate degree of dryness without causing the drying drum in each stage to play.

Hot air for drying may be supplied from the outside of the drum to accelerate the drying. Further, when a plurality of drums are provided, the amount, temperature, and circulation of hot air can be controlled according to the amount of heat required for each stage.

[0024]

EXAMPLE When sludge (for example, when the volume is set to 100 on the basis of volume) is dried by a drying device provided with four drums having almost the same structure, the form and characteristics of the sludge,
In particular, taking into account the relationship between the form and the degree of dryness, the rotation direction, time, and speed of each drying drum are controlled under a preset relationship. A treatment having a volume of 40 was performed, a treatment having a volume of 20 for a three-stage drum was performed to 13, and a treatment for a four-stage drum having a volume of 13 was performed. As a result, the volume can be efficiently reduced to 1/10 and the weight ratio is reduced to 1/5, which makes it possible to remarkably reduce the disposal cost of the material to be dried.

[0025]

EFFECTS OF THE INVENTION In the conventional type in which a horizontal drum is rotated only in one direction to dry an object to be dried and a screw type discharging mechanism is provided and discharged, the installation cost is high and the drum is inclined. It is difficult to control the dryness of the material to be dried with a certain degree of dryness in the type that facilitates the discharge of dried material by tilting the drum when discharging and tilting the drum in the type that discharges it. Although there is a drawback that an extra device for doing so is required, the drying drum provided with the dry matter discharge mechanism according to the present invention is sufficient only by reversing the rotation direction. There is a remarkable effect as described in.

At the time of discharging, it is sufficient to simply rotate the drum in the reverse direction, and no additional device such as a screw type discharging mechanism is required, so that the facility cost can be reduced.

In the invention according to the present invention, since the drum can be placed horizontally, it is easy to maintain the dryness constant when the shape and characteristics of the material to be dried are indefinite.

The type in which the drum is horizontal and the material to be dried is dried and the drum is tilted and discharged while the rotation is kept at the time of discharging requires an additional device for tilting the drum at the time of discharging. In the case of the invention, since it is sufficient to simply rotate the drum in the reverse direction at the time of discharging, the mechanism for discharging can be a mechanism for rotating the rotary motor in the reverse direction or an extremely simple mechanism such as inserting one intermediate gear. is there.

The reverse-rotation action lifter (5) has a simple structure in which it is bent so that the dried product can be raised to a higher position during reverse rotation than it does during normal rotation. Since the mechanism that operates at the time of rotation can be integrated (FIG. 2) or a structure close to it, the structure can be simplified and the manufacturing cost can be reduced.

By providing the frustoconical dissipation prevention device (8), it is possible to prevent dissipation of the dried material or dried material which is easily scattered by the rotation of the drum or hot air.

Further, since a plurality of drying drums having a mechanism for discharging a dried product at the time of reverse rotation are provided and the rotating directions, time and speeds of the respective drying drums can be controlled under a preset constant relationship, It became possible to dry, transfer and discharge the material to be dried efficiently and continuously without letting the drying drum of the stage play.

In the case of the transfer rib attachment A, the discharging process can be performed to the nearly empty state in the drum by the action of the transfer rib during the reverse rotation. This is particularly important when the material to be dried is a food or a chemical agent and there is a risk that deterioration of quality will occur if the material is dried for more than the required time. Transfer rib installation B
In the case of, the remaining amount that is not discharged by the action of the transfer rib during the reverse rotation is returned to the drying step to be dried again, so that the remaining dried object that is not discharged can be dried again. If the repeating method is adopted, the length of the drum can be further shortened. At that time, the dryness of the material to be dried can be arbitrarily controlled by adjusting the normal rotation time, which is a drying step, in length.

The reverse rotation action lifter (5) is provided on the discharge side separately from the forward rotation action lifter (4), and the discharge chute (7) is in the same range as the range of the reverse rotation action lifter. By providing in the above, it is possible to discharge only the dried product that has reached the discharge dryness.

Further, the falling position of the material to be dried and the material to be dried during reverse rotation is different between the dried material in the reverse rotation action lifter (5) part and the dry object in the forward rotation action lifter (4) part. By setting the position of the discharging chute by utilizing (FIG. 1), it becomes possible to distinctly and surely discharge the dried material having a more constant degree of dryness.

By providing a plurality of stages of drums, it is possible to efficiently dry and discharge the material to be dried into a dried product having an appropriate degree of dryness without allowing the drying drums of the respective stages to play.

The hot air for drying can be supplied from the outside of the drum to accelerate the drying, and when a plurality of drums are provided, the amount of hot air, the temperature, the direction, the circulation, etc., required for each stage. It can also be controlled according to.

Since the ratio of the lengths of the forward-working lifter (4) and the reverse-working lifter (5) can be set according to the form, characteristics, and throughput of the material to be dried, a predetermined amount and dryness can be obtained. It is possible to discharge only what has been reached.

The amount of dry matter to be discharged can be set in advance by establishing a fixed relationship between the length without the transfer rib (6) and the length of the counter-rotating action lifter (5). , The dried product can be discharged reliably

Further, by cutting both ends or one end of the action lifter (4) at the time of forward rotation, excessive accumulation of the material to be dried near the end plate (2) on the feeding side is prevented, and at the time of forward rotation. It is also possible to ensure the separation between the dried material and the material to be dried during drying at the boundary between the working lifter and the counter rotating lifter (5).

[Brief description of drawings]

FIG. 1 is a perspective view of a drying drum. (Example)

FIG. 2 is a perspective view showing a partition member, a forward rotation action lifter, a reverse rotation action lifter, a transfer rib, and a mounting state thereof. (Example)

FIG. 3 is a perspective view of a dissipation prevention device. (Example)

FIG. 4 is a perspective view showing a conventional method.

[Explanation of symbols]

1 outer cylinder 2 end plates 3 partition materials 4 Lifter for normal rotation 5 Reverse lift action lifter 6 Transfer ribs 7 Discharge chute 8 Dissipation prevention device 11 outer cylinder 16 Transfer rib

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Huang Zhan             3-1, 1-1 Kaigan-dori, Chuo-ku, Kobe-shi.             C. C. 5th floor of the building F term (reference) 3L113 AA06 AB01 AC01 AC45 AC46                       AC50 AC51 AC54 AC57 AC63                       AC68 AC78 AC79 BA01 CA08                       CA11 CA15 CB01 CB23 CB24                       CB28 CB34 CB35 DA01 DA04                       DA06 DA07 DA11

Claims (5)

[Claims] 1. A rotary drying drum for rotating and drying an object to be dried, wherein a mechanism having a discharging action at the time of reverse rotation is provided inside the drying drum. 2. A lifter, which is a mechanism for discharging during reverse rotation, is configured to raise a dried product to a higher position during reverse rotation than a position during forward rotation. mechanism 3. A drying drum for discharging a dried product during reverse rotation, wherein the mechanism according to claim 1 having a discharging action during reverse rotation is provided with the mechanism according to claim 2. 4. A drying drum according to claim 3, further comprising a device for preventing dissipation at the time of charging and discharging. 5. A method for controlling a rotating direction, time, and speed of each of the drying drums in a predetermined relationship in a drying device having a plurality of drying drums provided with a mechanism for discharging a dried product during reverse rotation.