JP3867269B2 - Rotating drum type dryer with anti-tangle type stirring blades - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dryer used for pretreatment of municipal waste in an RDF manufacturing facility, a municipal waste gasification melting facility, and the like, and in particular, an apparatus capable of preventing the string-like waste contained in the municipal waste from being entangled. It is related to.
[0002]
BACKGROUND OF THE INVENTION
Recently, garbage such as household waste and industrial waste discharged in the city is dried and reused as, for example, RDF power generation as solid fuel. One type of dryer used at that time is a rotary drum type dryer, which is provided with a rotary shaft that penetrates both openings in a cylindrical rotary drum that is horizontally disposed rotatably, Further, the rotating shaft is provided with a stirring blade. Further, a lifter is provided on the inner surface of the rotating drum, and the municipal waste is stirred and dispersed by the stirring blade and the lifter.
[0003]
Using such a rotary drum type dryer, a moisture content of 60 to 70% W.S. When drying municipal waste of B or higher, this kind of low-quality waste has low dispersibility and fluidity, so that there is a problem that the contact between the low-quality waste and hot air is not suitably performed and the drying efficiency is lowered. It was.
And as a countermeasure for this, it is also possible to increase the rotational speed of the stirring blade provided for the purpose of stirring the object to be processed. Is likely to be entangled with the rotating shaft and the stirring blade, so there is a limit and the effect is not sufficient.
[0004]
The string-like waste is separated from the waste group being processed (residual waste) in the dryer, and the degree of freedom increases. B. It becomes easy to get entangled with respect to the stirring blade and the rotating shaft in the region in the rotating drum as described below. Once the string-like dust is entangled with the stirring blade and the rotating shaft, the processing object is not sufficiently stirred and fed, and the drying efficiency is significantly reduced.
[0005]
By the way, as shown in FIG. 7, the agitating blade that has been widely used in the past is attached so that the small face of the action plate 32a ', which is a plate material, is perpendicular to the rotating shaft 30', and further, the tip portion serving as the agitating action portion. Is bent in the axial direction of the rotary shaft 30 ', and the workpiece is scraped up like a sand wedge of a golf club. Such a stirring blade 32 ′ is designed so as to effectively disperse the object to be processed, but on the other hand, the string-like dust L is present at a portion where the centrifugal force near the rotating shaft 30 ′ is small. It was also easy to wrap around.
At present, a maintenance work for removing the string-like dust L entangled with the stirring blade 32 'or the rotating shaft 30' is indispensable at least once a week.
[0006]
[Technical issues for which development was attempted]
The present invention has been made in view of such a background, and can prevent the string-like dust from being entangled with the stirring blade without reducing the dispersion effect of the object to be processed by the stirring blade. Thus, the development of a rotating drum type dryer equipped with a novel entanglement type stirring blade capable of stable operation was attempted.
[0007]
[Means for Solving the Problems]
That is, in the rotary drum type dryer provided with the entanglement prevention type stirring blade according to claim 1, the object to be treated supplied from the charging port of the rotary drum is rotated on the rotary drum and the rotary shaft arranged in the rotary drum. In the rotary drum type dryer in which the agitated blade is agitated by the rotation of the agitating blade to be contacted with the hot air and dried, and the dried objects are sequentially discharged from the discharge port. An action plate that exerts an agitating action on an object and an anti-entanglement plate, and the action plate is a plate material, and a small end surface of the action plate is attached in parallel to the rotation axis, and the anti-entanglement plate Is attached with a relief angle with respect to the surface of the working plate on the rotational direction side .
According to the present invention, the string-like dust that comes into contact with the entanglement preventing plate is swept away by the centrifugal force toward the inner peripheral side of the rotating drum, so that it is not entangled with the stirring blade.
[0008]
According to a second aspect of the present invention, there is provided a rotary drum type dryer provided with the anti-tangle type stirring blade, wherein the object to be treated supplied from the inlet of the rotary drum is rotated on the rotary drum and the rotary shaft disposed in the rotary drum. In the rotary drum type dryer in which the agitated blade is agitated by the rotation of the agitating blade to be contacted with the hot air and dried, and the dried objects are sequentially discharged from the discharge port. become comprises a working plate and絡付preventing plate on the stirring action on the object, the working plate is a plate member, attached to Cartesian the small surface of the working plate to the rotation axis, a further stirring action unit the tip portion state, and are not formed by bending in the axial direction of the rotary shaft, the絡付preventing plate is characterized in that mounted in a state in which no relief angle to the plane of the rotational direction of the working plate It consists of.
According to this invention, it is possible to prevent the string-like dust from being entangled while effectively dispersing the object to be processed by the bent portion. Further, by attaching the anti-tangle plate to the existing apparatus, it becomes possible to prevent the string-like dust from being entangled without impairing the dispersion effect of the object to be processed.
[0009]
Furthermore, in addition to the above requirements, the rotary drum type dryer provided with the entanglement prevention type stirring blade according to claim 3 is characterized in that the entanglement prevention plate is arranged on a tangent line of the rotation shaft. .
According to the present invention, it is possible to smoothly perform the operation of causing string-like dust to flow toward the inner peripheral side of the rotary drum by centrifugal force.
[0010]
Furthermore, in addition to the above requirements, the rotary drum type dryer provided with the entanglement prevention type stirring blade according to claim 4 is characterized in that a space formed between the action plate and the entanglement prevention plate is closed. It is.
According to the present invention, it is possible to avoid the string-like dust from entering the space formed between the action plate and the entanglement prevention plate and entangled with the stirring blades carelessly.
The above-described problems can be solved by using the requirements described in these claims as means.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary drum type dryer provided with an anti-tangle type stirring blade of the present invention will be described below based on the illustrated embodiment.
In the figure, reference numeral 1 denotes a rotary drum type dryer, which is provided with a cylindrical rotary drum 2 that is rotatably disposed horizontally, and is rotatably provided across the longitudinal direction in the rotary drum 2. Which are supported by a loading machine frame F1, a discharge machine frame F2 and a support roller R.
In this specification, the direction of the rotary drum dryer 1 is defined as the forward direction of the municipal waste D as the object to be processed, that is, the discharge port 21 side of the rotary drum 2, and the opposite side, that is, the input port 20. The side is defined as the rear.
Further, in the following description, the municipal waste D, which is an object to be processed by the rotary drum dryer 1, stays between the inlet 20 and the outlet 21 in the rotary drum 2 and is dried. This is referred to as staying garbage D1.
[0012]
Hereinafter, each member constituting the rotary drum dryer 1 will be described. The rotary drum 2 is a cylindrical member, and is rotatably mounted on a support roller R provided on the base B. The opening portions on both sides are closed by the input side cover body 2A and the discharge side cover body 2B, and the rotary drum 2 can rotate at the boundary between the input side cover body 2A and the discharge side cover body 2B and the rotary drum 2. It is sealed in a proper state.
An input port 20 and a hot air blowing port 22 are formed in the input side lid 2A, and a discharge port 21 and an exhaust port 23 are formed in the discharge side cover 2B.
Then, as shown in FIG. 2, the rotary drum 2 inlet weir 24 flat ring-shaped in the portion of the input-side lid 2A side that put the inside is provided, on the other hand, the flat plate to the portion of the discharge-side lid 2B side ring A shaped outlet weir 25 is provided. The outlet weir 25 is for restricting the outflow amount of the object to be processed, and the height dimension of the outlet weir 25 (the difference between the outer diameter and the inner diameter) is the retention of the object to be processed located in the rotary drum 2. The amount of staying of the dust D1 is determined.
[0013]
As shown in FIG. 3, four angle-shaped lifters 26 are provided on the inner surface of the rotary drum 2 as an example at intervals of 90 ° in front view. The lifter 26 has a height dimension set to 1/3 or less, for example, 2/7 of the height dimension of the outlet weir 25, and has an upper portion formed as a pointed shape to be inward from the center side of the rotary drum 2. It is formed so as to incline in a flared shape toward the peripheral surface side.
[0014]
Here, the structure for rotationally driving the rotary drum 2 will be described. As shown in FIGS. 1 and 2, this structure has the chain 27 attached to the gear provided on the outer peripheral surface slightly on the input side from the center of the rotary drum 2. The rotary drum 2 is wound and driven to rotate by the drive motor M1.
[0015]
Next, the agitation transfer mechanism 3 will be described. This agitation transfer mechanism 3 includes a spiral blade 31 and a stirring blade 32 with respect to the rotary shaft 30 as shown in FIGS. It is supported in a freely rotatable manner.
The rotary shaft 30 is disposed so as to penetrate the rotary drum 2 in the longitudinal direction thereof. As an example, the rotary shaft 30 is below a horizontal line passing through the center of the rotary drum 2 in a front view as shown in FIG. , And at a location that does not overlap the vertical line passing through the center.
[0016]
The spiral blade 31 is formed along the longitudinal direction with respect to the side peripheral surface of the rotating shaft 30 and is formed so as to advance from the rear to the front as the rotating shaft 30 rotates. . The width of the spiral blade 31, that is, the height of the thread is set shorter than the height of the stirring blade 32 as shown in FIG. 3, and the pitch can be set at an appropriate interval. it can.
[0017]
On the other hand, the stirring blade 32 employs a blade plate type as an example. As shown in FIGS. 1 and 4, a plate-like action plate 32 a is inserted on the surface of a ring 30 a that is inserted into and fixed to the rotary shaft 30. The small facet is erected so as to be parallel to the rotating shaft 30, and a support plate 32b is provided behind the action plate 32a (on the opposite side to the rotation direction). Further, the surface of the action plate 32a on the rotational direction side, that is, the surface in contact with the object to be processed is provided with an anti-entanglement plate 32c.
The entanglement preventing plate 32c is attached to the action plate 32a as shown in FIG. 4C, and the tip of the entanglement preventing plate 32c substantially agitates the object to be processed. The action plate 32a is fixed so as to come into contact with a portion near the rotating shaft 30 avoiding the tip portion. Furthermore, in this embodiment, as shown in the upper part of FIG. 4C, the entanglement preventing plate 32 c is arranged on the tangent line of the rotating shaft 30. In addition, as shown in the lower part in the same figure, it is also possible not to arrange the entanglement preventing plate 32c on the tangent line of the rotating shaft 30. The entanglement preventing plate 32c attached in this manner is in a state having a relief angle θ with respect to the action plate 32a.
[0018]
In this embodiment, the space formed between the action plate 32a and the anti-tangle plate 32c is closed, and the portion surrounded by the action plate 32a, the anti-entrainment plate 32c and the rotating shaft 30 is covered with the cover plate. It was blocked by 32d.
Furthermore, although the illustrated anti-entanglement plate 32c has a flat plate shape, it may have a curved surface.
Further, the ring 30a substantially constitutes a part of the rotating shaft 30, and is provided for facilitating processing, and includes the action plate 32a, the support plate 32b, and the anti-entanglement plate 32c. The covering plate 32d may be directly attached to the rotating shaft 30.
[0019]
And, as shown in FIG. 3, as an example, the agitation blade 32 is attached in such a manner that the agitation blades 32 are arranged radially at intervals of 90 ° with respect to the rotary shaft 30 as shown in FIG. As shown in the figure, two stirring blades 32 are arranged on the diameter of the rotary shaft 30, and such a combination is shifted by 90 ° in the axial direction of the rotary shaft 30 and connected. Further, in this embodiment, the mounting pitch of the stirring blades 32 is set to be equally spaced in the axial direction of the rotary shaft 30, but the pitch may be appropriately changed.
In the place where the spiral blade 31 and the stirring blade 32 overlap with each other, the spiral blade 31 is divided, and the divided portion is connected to the action plate 32a and the anti-entanglement plate 32c. At this time, the spiral blade 31 substantially functions as the support plate 32b.
[0020]
Next, the structure for rotationally driving the rotary shaft 30 will be described. In this structure, the drive motor M2 is attached to the discharge-side machine frame F2 placed on the base B2 on the front side of the rotary drum 2 as shown in FIGS. The chain 35 is wound around the sprocket 34 provided on the rotary shaft 30 and the output shaft of the drive motor M2, respectively, thereby transmitting the driving force from the drive motor M2 to the rotary shaft 30.
[0021]
A charging device 4 for supplying municipal waste D as an object to be processed into the rotating drum 2 is provided on the charging-side machine frame F1 placed on the base B1 on the rear side of the rotating drum 2. In this embodiment, the charging device 4 is configured by combining the hopper 40 and the screw conveyor 41 as an example.
Further, a discharge device 5 to which a screw conveyor or the like is applied is provided below the discharge port 21 in the rotary drum 2.
[0022]
The rotary drum dryer having the entanglement prevention type stirring blade of the present invention is configured as described above as an example, and the operation of the stirring blade 32 will be described below together with the operation mode of the rotary drum type dryer 1. To do.
First, in a state where the rotary drum 2 and the rotary shaft 30 are rotated in the counterclockwise direction in FIG. 3, hot air is blown into the rotary drum 2 from the hot air blowing port 22, and then the municipal waste D is turned into the rotary drum 2 by the input device 4. Supply in.
Then, as shown in FIG. 5, the municipal waste D (retained waste D1) is agitated by the tip portion of the agitating blade 32 in the agitating and transporting mechanism 3 and scattered in the rotating drum 2 and the moisture is evaporated by contacting with the hot air. The moisture content decreases, and further, a part of the staying dust D1 is lifted by the lifter 26 and proceeds to the discharge port 21 side while promoting stirring. Eventually, the accumulated dust D1 reaching the exit weir 25 gets over this and reaches the discharge device 5 from the discharge port 21.
[0023]
In such a process of drying the municipal waste D, if the string-like waste L is mixed in the city waste D, the string-like waste L is separated from the staying waste D1 as the staying dust D1 is dried. The degree of freedom is increased, and the inside of the drum 2 starts to float.
At this time, even if the string-like dust L is in contact with or wrapped around the stirring blade 32, the stirring blade 32 is attached to the action plate 32a with a relief angle θ attached thereto. Therefore, the string-like dust L is guided toward the tip end of the stirring blade 32 by centrifugal force and is eventually detached from the stirring blade 32.
In this embodiment, since the entanglement preventing plate 32c is arranged on the tangent line of the rotating shaft 30, the string-like dust L that directly touches the rotating shaft 30 immediately moves onto the entanglement preventing plate 32c, It will be smoothly guided toward the tip of the stirring blade 32.
Further, since the space formed between the action plate 32a and the anti-entanglement plate 32c is closed by the covering plate 32d, it is possible to prevent the string-like dust L from entering the space and being inadvertently entangled.
[0024]
[Other embodiments]
Although the present invention is based on the above-described embodiment, the following embodiment can also be adopted based on the technical idea of the present invention. Specifically, the existing agitating blade 32 'described in the background of the invention and shown in FIG. 7 is modified. This existing agitating blade 32' is a plate material of the working plate 32a as shown in FIG. mounting a small surface to Cartesian to the rotary shaft 30, in which the tip portion further comprising a stirring action section, is bent in the axial direction of the rotary shaft 30.
[0025]
The entanglement preventing plate 32c is attached to the action plate 32a, and the tip of the entanglement prevention plate 32c is a rotating shaft that substantially avoids the tip of the action plate 32a that stirs the workpiece. Fix it so that it touches a point near 30. Further, in this embodiment, as shown in FIG. 6, the anti-tangle plate 32c is inserted into the rotating shaft 30 so as not to be arranged on the tangent of the ring 30a to be fixed, but is arranged on the tangent of the ring 30a. It can also be done. The entanglement preventing plate 32c attached in this manner is in a state having a relief angle θ with respect to the action plate 32a.
In this embodiment, the space formed between the action plate 32a and the anti-tangle plate 32c is closed, and the portion surrounded by the action plate 32a, the anti-entrainment plate 32c and the rotating shaft 30 is covered with the cover plate. It was blocked by 32d.
[0026]
In the case of such a configuration, it is possible to prevent the string-like dust L from being entangled while effectively dispersing the object to be processed. In particular, the existing apparatus is provided with the entanglement prevention plate 32c. By retrofitting, it becomes possible to prevent the string-like dust L from being entangled without impairing the dispersion effect of the object to be processed.
[0027]
【The invention's effect】
According to the present invention, even if the string-like garbage L is mixed in the city garbage D, the stirring blade of the string-like garbage L is not reduced without reducing the effect of stirring the workpiece by the stirring blade 32. Since the entanglement to 32 is prevented, the rotary drum dryer 1 can be operated stably, and the processing efficiency of the municipal waste D can be improved.
[Brief description of the drawings]
FIG. 1 is a partially enlarged side view of a rotary drum dryer according to the present invention.
FIG. 2 is a rear view and a front view of the same.
FIG. 3 is a cross-sectional view of a rotating drum.
FIG. 4 is a perspective view, a side view, and a front view showing a stirring blade.
FIG. 5 is a cross-sectional view showing how stagnant dust is stirred by a stirring blade and a lifter.
FIGS. 6A and 6B are a perspective view, a side view, and a front view showing a stirring blade described in another embodiment. FIGS.
FIG. 7 is a perspective view, a side view, and a front view showing an existing stirring blade.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating drum type dryer 2 Rotating drum 2A Input side cover body 2B Discharge side cover body 3 Stirring transfer mechanism 4 Input device 5 Discharge device 20 Input port 21 Discharge port 22 Hot air blowing port 23 Exhaust port 24 Inlet weir 25 Outlet weir 26 Lifter 27 Chain 30 Rotating shaft 30a Ring 31 Spiral blade 32 Stirring blade 32a Action plate 32b Support plate 32c Anti-entanglement plate 32d Cover plate 33 Bearing 34 Sprocket 35 Chain 40 Hopper 41 Screw conveyor B base B1 base B2 base C virtual circle D city waste D1 accumulated waste F1 input side machine frame F2 discharge side machine frame L string waste M1 drive motor M2 drive motor R support roller

Claims (4)

The object to be treated supplied from the inlet of the rotating drum is dried by rotating the rotating drum and rotating the stirring blade provided on the rotating shaft arranged in the rotating drum so as to contact with hot air and drying. the object to be processed after drying sequentially, in a rotary drum type dryer to be discharged from the outlet, wherein the stirring blade is made comprises a working plate and絡付preventing plate on the stirring action to the object to be treated, the working The plate is a plate material, and the small edge surface of the action plate is attached in parallel with the rotation axis, and the anti-entanglement plate is provided with a relief angle with respect to the rotation direction side surface of the action plate. A rotary drum dryer having an anti-tangle type stirring blade characterized by being attached. The object to be treated supplied from the inlet of the rotating drum is dried by rotating the rotating drum and rotating the stirring blade provided on the rotating shaft arranged in the rotating drum so as to contact with hot air and drying. In the rotary drum dryer that sequentially discharges the processed object after drying from the discharge port, the stirring blade includes an action plate that exerts an agitating action on the object to be processed and an anti-entanglement plate. plate is a plate, attached to Cartesian the small surface of the working plate to the rotation axis state, and are not the tip portion further comprising a stirring action section, is bent in the axial direction of the rotary shaft, the絡付 A rotary drum dryer having a tangling prevention type stirring blade , wherein the prevention plate is attached with a relief angle with respect to the surface of the action plate on the rotational direction side .   The rotary drum type dryer provided with the anti-tangle type stirring blade according to claim 1 or 2, wherein the anti-tangle plate is arranged on a tangent line of the rotary shaft.   4. A rotary drum dryer having an anti-entanglement type stirring blade according to claim 1, wherein a space formed between the action plate and the anti-entanglement plate is closed.

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