JPH08239B2 - Rotary drum dryer with crushing and stirring blades - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary drum dryer with a crushing stirring blade, for example, for human waste, sewage sludge, inorganic dehydrated cake, etc., and particularly to a rotating shaft of the crushing stirring blade. Is used as a cantilever shaft, and the product powder is suspended in the exhaust gas and discharged to the outside of the machine to enhance the sealing property of the dryer.

(Prior Art) Generally, solid components such as human waste and sewage sludge become muddy when there is a lot of water and become clumps when the water content decreases. Dry to a granule. That is, in this dryer, as shown in FIG. 6, the main body 31 is a horizontal rotary cylinder, and the front part and the rear part are supported by a pair of rotary wheels 32 and 33, respectively. A so-called rotation transmitting element such as a gear and a sprocket is attached to the 31 and is connected to a motor so that they rotate at an appropriate speed by rotating them. Further, a crushing stirring blade 34 is provided in the body, and further, on the material input side, in order to feed a constant quantity feeder 35 for quantitatively supplying the material to be dried into the rotary body 31 and hot air for drying. The hot air blowing duct 36 is attached, and the take-out side is provided with the take-out port 37 for taking out the dried product powder and the exhaust duct 38 for letting out the exhaust gas. The material to be dried is stirred and crushed by the rotation of the rotary drum 31 and the rotation of the crushing and stirring blades 34, while being brought into contact with the hot air sent into the drum to dry, and finally as dry powder and granules. It is taken out of the aircraft.

(Problems of the prior art) By the way, in this type of dryer, the rotary shaft 39 of the stirring blade 34 is provided so as to penetrate the rotary drum 31, so that the constant quantity feeder 35 and the hot air blowing duct 36 are provided on the material input side. Since the side plate 40 has to be formed so large that it has to be mounted at a position that does not match the rotation shaft 39, this side plate 40
The seal portion 41 between the rotating body 31 and the rotating body 31 inevitably becomes long. Similarly, on the take-out side, the take-out port 37 and the exhaust duct 38 are attached separately, so that the sealing portion between the side plate 40 and the rotary drum 31 also becomes long at this portion. Therefore, the sealing property of the dryer is deteriorated, the drying efficiency is lowered, and problems such as leakage of the powder and granules from the dryer occur. Further, conventionally, the product dry powder and granules were taken out from the outlet 37, so that the screw conveyor 43 and the flight conveyor 44 had to be attached to this portion.

Therefore, there is a drawback that the equipment cost is increased correspondingly and that a large installation space is required on the floor when the incidental equipment for operation and maintenance is included.

(Means for Solving the Problems) The present invention solves the above-mentioned drawbacks of the conventional drying apparatus, in which the rotating shaft of the crushing stirring blade is a cantilever shaft on the take-out side, whereby the material feeding side is provided. Then, it was possible to attach a constant quantity feeder and hot air blowing duct to the center of the side plate to make the side plate smaller, and on the take-out side, the product dry powder granules were discharged and collected together with the exhaust gas to make the side plate smaller. By shortening the sealing part, this improves the sealing performance of the dryer,
Further, the product dry powder and granules are so-called powder-transported and collected by using the exhaust gas, whereby the auxiliary equipment is omitted and the maintainability is improved.

(Example) Hereinafter, the present invention will be specifically described based on an illustrated example.

In the figure, reference numeral 1 is a rotating cylinder, and 2 is a crushing stirring blade. The rotary drum 1 forms the main body of the dryer, and has a pair of guide wheels 3f and 3r at the front part (material input side) and the rear part (takeout side), respectively.
It is supported by and is rotated at an appropriate speed by rotating this guide wheel.

The crushing and stirring blade 2 crushes the material to be dried put in the rotary cylinder 1, stirs it, brings it into contact with the hot air blown into the cylinder to dry it, and further crushes it. It is attached and rotates at a faster speed than the rotary cylinder 1. Further, a constant quantity feeder is attached to the material charging side of the rotary drum 1 so as to quantitatively charge the material to be dried into the barrel and a hot air blowing duct 6 is connected to the rotary drum 1 for drying. It is designed to blow in hot air, while the exhaust duct 7 is connected to the extraction side,
From here, the dry exhaust gas is discharged to the outside of the machine, and at the same time, the air flow is used to discharge the dry product granules. The exhaust duct 7 is connected to a cyclone dust collector 8 so that the product dry powder particles sent together with the exhaust gas are collected and dropped into the bunker 9, and the exhaust gas is discharged to the outside of the system.

To further describe these, first, the rotary shaft 4 is a so-called cantilever shaft, which is composed of a sleeve shaft 21, a fixed shaft 22, and a drive shaft 23, and is provided so as to penetrate the side plate 15 on the take-out side. That is, the fixed shaft 22 supports the sleeve shaft 21 and fixes the posture thereof. The fixed shaft 22 penetrates the side plate 15 and the front part projects into the rotary cylinder 1, and the rear part projects from the side plate, and this part is supported by the pedestal. It is fixed to a rear frame (not shown) via 25. The sleeve 21 forms the main body of the rotary shaft 4, the crushing and stirring blade 2 is attached to the sleeve 21, and has a cylindrical shape slightly thicker than the fixed shaft 22, and is fitted to the fixed shaft 22.

Of course, this sleeve 21 is closed at the tip,
Bearings 24 are provided at least at two points between the shafts 22 and 22, and the sleeve shaft 21 is rotatably held by the fixed shaft 22. The drive shaft 23 transmits the rotation of a drive motor (not shown) to the sleeve shaft 21, is formed to be slightly longer than the fixed shaft 22, is inserted in the axial center of the fixed shaft 22, and has the tip at the sleeve shaft. 21 and the rear end further protrudes from the fixed shaft 22,
A drive pulley 26 is attached here.

The side plate 11 on the material input side is formed to be considerably smaller than the front surface of the rotary drum 1 and slightly protruded. The constant quantity feeder 5 is attached to the center of the side plate 11 and the hot air blowing duct 6 is attached to the side surface.
Are formed. Therefore, the seal 12 between the side plate 11 and the rotary cylinder 1 is provided at a position where the side surface of the side plate 11 and the front surface of the rotary cylinder 1 intersect.

Similarly, the side plate 15 on the take-out side is also formed to be considerably smaller than the rear surface of the rotary cylinder 1 and slightly protruded, and the exhaust duct 7 is formed on the side surface thereof. An inspection port 13 is also formed on this side surface, and a seal 14 is formed between the rear surface of the rotary drum 1 and the inspection port 13.

In order to dry the material to be dried, the rotary drum 1 and the crushing and stirring blades 2 are rotated according to a conventional method, hot air is sent into the drum and the blower 10 is driven, and hot air is circulated in the exhaust duct 7. Put the material to be dried in 1. Then, the material to be dried is agitated by the rotation of the rotary drum 1 and the crushing and stirring blades 2, crushed, and gradually transferred to the unloading side while being dried.
Then, the material to be dried is exhausted along with the hot air in the body to the exhaust duct 7
It is sucked into, is further dried therein, is collected by the cyclone dust collector 8 and is contained in the bunker 9. On the other hand, the hot air is discharged outside the machine as exhaust gas by the blower 10.

(Effects of the Invention) As described in detail above, the present invention is a rotary drum dryer equipped with crushing and stirring blades. It is designed to discharge the powder and granules using the air flow of exhaust gas, which makes it possible to attach the constant quantity feeder and the hot air blowing duct to the center part of the side plate on the material input side, and the side plate The sealing line between the side plate and the rotating drum becomes shorter, and the side plate becomes smaller on the take-out side as well, and the sealing line between the side plate and the rotating drum becomes shorter, improving the sealing performance of the dryer. For example, compared to a conventional dryer of the same type, it had the effect of reducing the amount of leaked air by 30 to 50%. In addition, ancillary equipment is downsized, which reduces equipment costs and improves maintainability.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view showing a dryer, FIG. 3 is a front view of the same as above, FIG. 4 is a rear view, and FIG. FIG. 6 is a side view showing a conventional rotary drum dryer. 1; Rotating body, 2; Crushing stirring blade 3; Guide wheel, 4; Rotating shaft 5; Constant volume feeder, 6; Hot air blowing duct 7; Exhaust duct, 9; Bunker 8; Cyclone dust collector 10; Blower, 11; Side plate 12 ; Seal, 13; inspection port 14; seal, 15; side plate 21; sleeve shaft, 22; fixed shaft 23; drive shaft, 24; bearing 25; work stand, 26; drive pulley

Claims (4)

[Claims] 1. A fixed quantity feeder and a hot air supply duct are attached to a material feeding side of a rotary drum whose front and rear portions are supported by a pair of guide wheels, respectively, and an exhaust duct is attached to an unloading side and the inside is crushed. In a rotary drum dryer equipped with a stirring blade, the rotating shaft of the crushing stirring blade is a cantilever shaft, and the crushing stirring blade is characterized by being provided through the side plate on the take-out side of the rotating drum. A rotating drum dryer equipped. 2. The material input side plate is smaller than the front surface of the rotary cylinder and slightly protrudes, and a constant quantity feeder is attached to the central part thereof and a hot air blowing duct is formed on the side surface thereof. A rotary drum dryer provided with the crushing stirring blade according to claim 1. 3. The side plate on the take-out side is smaller than the rear face of the rotary drum,
The crushing stirring blade according to claim 1 or 2, characterized in that it is protruding and an exhaust duct for discharging exhaust gas and dry product granules is formed on its side surface. A rotary drum dryer equipped with. 4. The rotating shaft comprises a sleeve shaft, a fixed shaft and a drive shaft. The fixed shaft penetrates a side plate on the take-out side of the rotary drum, and a portion protruding outward from the side plate is fixed to the machine frame. Claims 1 and 2 characterized in that the sleeve shaft is fitted in the portion projecting into the rotary cylinder, and the drive shaft penetrates the fixed shaft and its tip is connected to the sleeve shaft. Item 3. A rotary drum dryer provided with the crushing and stirring blade according to item 3 or 3.