JP3890467B2 - Rotating drum dryer with tangling prevention rotating shaft - 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, prevents string-like waste contained in municipal waste from being entangled with a rotating shaft. It relates to a device capable of performing the above.
[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 rotation speed of the stirring blade provided for the purpose of stirring the object to be processed. There is a limit because it is likely to get entangled with the rotating shaft, 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 the rotating shaft and the stirring blade in the region in the rotating drum which will be described below. Once the string-like dust is entangled with the rotating shaft and the stirring blade, the stirring and feeding action of the object to be processed is not sufficiently performed thereafter, and the drying efficiency is remarkably lowered. That is, as shown in FIG. 8, the string-like dust L is shorter than the circumference of the rotary shaft 30 ', and is not sufficiently long to be entangled even if it contacts the rotary shaft 30'. On the other hand, as shown in FIG. 9, the string-like dust L longer than the circumferential length of the rotating shaft 30 'may be entangled so as to be wound around the rotating shaft 30'. For this reason, conventionally, attempts have been made to reduce the entanglement of the string-like dust L by setting the rotating shaft 30 'to be thicker. However, increasing the diameter of the rotating shaft has only physical limitations. In addition, since the weight of the rotating shaft increases as the diameter increases, the load on the driving system of the rotating shaft is increased.
[0005]
[Technical issues for which development was attempted]
The present invention was made in view of such a background, and can prevent the string-like dust from being entangled with the rotation shaft without increasing the load on the drive system of the rotation shaft, As a result, the development of a rotating drum dryer having a new anti-tangled rotating shaft capable of stable operation was attempted.
[0006]
[Means for Solving the Problems]
That is, the rotary drum type dryer provided with the entanglement prevention type rotary shaft according to claim 1 is configured such that the object to be treated supplied from the inlet of the rotary drum is rotated on the rotary drum and the rotary shaft arranged in the rotary drum. In the rotary drum dryer, which is dried by contacting with hot air by stirring by rotation of the stirring blades provided, and the processed material after drying is sequentially discharged from the discharge port, the rotating shaft has stirring A spiral blade is provided together with the blade, and the spiral blade is formed in the vicinity of the discharge port of the rotating shaft, and the stirring blade is not provided at this portion, and the apparent diameter of the rotating shaft is formed by the spiral blade. This is characterized in that it is configured to prevent the string-like dust from being entangled with the rotating shaft by enlarging the shaft.
According to the present invention, first, string-like dust is prevented from coming into contact with the rotating shaft by the wind flow generated by the spiral blade, and further, the diameter of the apparent rotating shaft , that is, the circumferential length is increased by the spiral blade. It is possible to prevent the string-like dust from being entangled with the rotation shaft. Further, since the stirring blade and the spiral blade are provided side by side, the string-like dust can be prevented from being entangled without reducing the stirring dispersion effect.
In addition, it is possible to prevent the string-like dust that is most likely to be entangled from drying up to the final stage and to be inadvertently entangled with the stirring blade.
[0007]
In addition to the above requirements, the rotary drum dryer provided with the anti-tangling rotary shaft according to claim 2 has a moisture value of 30% W.W. B. It is characterized by being provided in the following areas.
According to the present invention, the string-like dust is separated from the waste group being processed and the degree of freedom is increased, so that it is possible to prevent entanglement in the region where the string is most likely to be entangled.
[0008]
Furthermore, in addition to the above-mentioned requirements, the rotary drum type dryer provided with the entanglement prevention type rotary shaft according to claim 3 has an outlet weir for determining a retention amount of an object to be processed on the discharge port side of the rotary drum. And the helical wing in the vicinity of the exit weir is tapered.
According to the present invention, it is possible to avoid hindering the outflow of the workpiece overflowing from the exit weir by the spiral blade.
The above-described problems can be solved by using the requirements described in these claims as means.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary drum type dryer provided with a tangling prevention type rotating shaft according to 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.
[0010]
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.
As shown in FIG. 2, a flat ring-shaped inlet weir 24 is provided in a portion of the rotary drum 2 on the input side lid 2A side, while a flat ring-shaped inlet weir 24 is also provided on the discharge side lid 2B side. An exit 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.
[0011]
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.
[0012]
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.
[0013]
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.
[0014]
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. . 1 and 4 show the spiral blade 31 formed in a left-handed manner, it may be formed in a right-handed manner.
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.
[0015]
Further, in this embodiment, the portion where the spiral blade 31 is formed is an area located near the discharge port 21, specifically in the rotary drum 2 as shown in FIG. 1, and is about 1 of the length of the rotary shaft 30. A portion on the discharge port 21 side in the range of / 3.
Further, in this embodiment, the spiral blade 31 is formed in two lines with the phase shifted by 180 °, and the spiral blade 31 in the vicinity of the outlet weir 25 is formed in a tapered shape that tapers toward the discharge port 21 side. . Then, as shown in FIG. 3B, a virtual circle C is formed by the outline of the spiral blade 31, and the diameter of the rotating shaft 30 in a cross-sectional view is apparently enlarged.
It is also possible to cut the string-like dust L by forming the edges of the spiral blade 31 sharply.
[0016]
On the other hand, the stirring blade 32 employs a blade plate type as an example. As shown in FIGS. 1 and 4, a flat action plate 32 a is set up on the surface of a ring 30 a that is inserted into and fixed to the rotary shaft 30. The support plate 32b is provided 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.
For example, as shown in FIG. 3, the agitation blade 32 is attached in a radial manner at intervals of 90 ° with respect to the rotary shaft 30 as viewed from the front. In this embodiment, the mounting pitch of the stirring blades 32 is set at equal intervals 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.
[0017]
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.
[0018]
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.
[0019]
The rotary drum type dryer provided with the entanglement prevention type rotary shaft of the present invention is configured as described above as an example. Hereinafter, the rotary drum type dryer shaft together with the operation mode of the rotary drum type dryer 1 will be described. The operation of 30 will be described.
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 agitating blade 32 in the agitating and transporting mechanism 3 and is scattered in the rotating drum 2 and is also brought into contact with the hot air to evaporate moisture and increase the moisture content. Further, the lifter 26 lifts a part of the accumulated dust D1 and proceeds to the discharge port 21 side while promoting stirring. Eventually, the accumulated dust D1 reaching the outlet weir 25 gets over this and is discharged from the discharge port 21 and reaches the discharge device 5.
[0020]
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.
In this embodiment, as an example, 70% W.W. B. Of urban waste D, and the water content of the staying waste D1 is 30% W.W. B. The string-like dust L starts to float in the region close to the discharge port 21 as described below.
[0021]
Here, the anti-entanglement type rotary shaft 30 functions. First, as shown in FIG. 6, the spiral blade 31 generates a wind flow from the center side of the rotary shaft 30 to the outside. Can reduce the chance of contact with the rotating shaft 30, the spiral blade 31 and the stirring blade 32.
[0022]
Further, as shown in FIGS. 7A and 7B, the apparent diameter of the rotating shaft 30 is expanded like a virtual circle C by the spiral blade 31 formed along the longitudinal direction of the rotating shaft 30. For this reason, even if the string-like dust L longer than the circumferential length of the rotating shaft 30 comes into contact with the rotating shaft 30, a part of the string-like dust L is sandwiched so that the string-like dust L is wound around the rotating shaft 30, As a result, there is no possibility that the string-like dust L will be entangled, and the string-like dust L will eventually fall off the rotary shaft 30.
[0023]
Further, as shown in FIG. 7 (c), when the string-like dust L is guided to the spiral blade 31 by the rotation of the rotary shaft 30, it is sent forward, so that a part of the string-like dust L itself is sandwiched. Therefore, the apparent diameter (peripheral length) of the rotating shaft 30 is substantially enlarged. For this reason, the string-like dust L does not become entangled with the rotary shaft 30 and cannot be removed, and eventually falls off the rotary shaft 30.
[0024]
Furthermore, the stirrer blade 32 is not provided in the vicinity of the discharge port 21 in the rotary shaft 30, so that the string-like dust L in a state where the drying proceeds to the final stage and is most likely to be entangled is inadvertently the stirrer blade 32. Can be avoided.
[0025]
Furthermore, since the spiral blade 31 in the vicinity of the outlet weir 25 is tapered, it is possible to prevent the spiral blade 31 from obstructing the outflow of the workpiece overflowing from the outlet weir 25.
Incidentally, in the conventional apparatus, as shown in FIG. 9, among the string-like dust L in such a floating state, those longer than the circumference of the rotary shaft 30 ′ are entangled so as to entrain the rotary shaft 30 ′. I couldn't get it.
[0026]
【The invention's effect】
According to the present invention, since the load on the drive system of the rotating shaft 30 is not increased, a member more robust than necessary is not required, and the cost of the apparatus can be reduced. In addition, even when the string-like garbage L longer than the circumference of the rotating shaft 30 is mixed in the city garbage D, the string-like garbage L is prevented from being entangled with the rotating shaft 30. 1 can be operated stably, and the processing efficiency of city 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 and a cross-sectional view showing a stirring shaft and a spiral blade.
FIG. 4 is a side view showing an agitation transfer mechanism.
FIG. 5 is a cross-sectional view showing how stagnant dust is stirred by a stirring transfer mechanism and a lifter.
FIG. 6 is a skeletal perspective view for explaining the action of a spiral blade.
FIG. 7 is a side view, a cross-sectional view, and a perspective view for explaining the operation of the spiral blade.
FIGS. 8A and 8B are a perspective view and a cross-sectional view for explaining the behavior of string-like dust with respect to a rotating shaft in a conventional apparatus. FIGS.
9A and 9B are a perspective view and a cross-sectional view for explaining the behavior of string-like dust with respect to a rotating shaft in a conventional apparatus.
[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 Tangled prevention plate 33 Bearing 34 Sprocket 35 Chain 40 Hopper 41 Screw conveyor B Base B1 Base B2 Base C Virtual circle D Urban garbage D1 Residual waste F1 input side machine frame F2 discharge side machine frame L string-like dust M1 drive motor M2 drive motor R support roller

Claims (3)

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 type dryer that sequentially discharges the processed material after drying from the discharge port, the rotary shaft is provided with a spiral blade together with the stirring blade, and this spiral blade is disposed near the discharge port of the rotary shaft. The stirrer blade is not provided at this location, and the apparent diameter of the rotating shaft is increased by the spiral blade to prevent the string-like dust from being entangled with the rotating shaft. Rotating drum type dryer equipped with an anti-tangled rotating shaft characterized by   The spiral blade has a water content of 30% W.D. B. 2. A rotary drum dryer having a tangle-preventing rotary shaft according to claim 1, wherein the rotary drum dryer is provided in the following region. 3. An outlet weir for determining a retention amount of an object to be processed is provided on the discharge port side of the rotary drum, and a spiral blade in a vicinity of the outlet weir is tapered. Rotating drum type dryer with an anti-tangle type rotating shaft.

Images