KR101243986B1 - Drying apparatus for waste material - Google Patents

Abstract

PURPOSE: A wastes drying device is provided to improve drying efficiency of inputted wastes by efficiently crushing and stirring wastes inputted inside a dry drum and by increasing a hot air contact area of the wastes and contact time between the wastes and hot air. CONSTITUTION: A wastes drying device(100) comprises a dry drum(110), a hot air supplying duct(130), an exhaust duct(133), a wastes exhaust hopper, a drum rotation device, a hot air supplying device(150), and a wastes inputting device(160). The dry drum comprises a drying room(112), an inner drum(111), an outer drum(116), a fluid path(118), and a keeping warm member(121). The hot air supplying duct is connected to an inlet of the inner drum by being rotatably connected to one end of the inner drum. The exhaust duct is located in outside of the inner drum in order to surround outer periphery of the one end of the inner drum. The wastes exhaust hopper is rotatably connected to the other end of the dry drum. The drum rotation device supplies rotatory power to the dry drum and rotates the dry drum. The hot air supplying device generates hot air and supplies the hot air to the drying room of the dry drum through the hot air supplying duct. The wastes inputting device puts the wastes into the drying room through the inlet of the inner drum.

Description

Drying apparatus for waste material

The present invention relates to a waste drying apparatus, and more particularly, to a waste drying apparatus capable of effectively drying through hot air supply while crushing waste having a high moisture content such as food waste or sludge.

Recently, the amount of waste is increasing day by day due to industrial development and population increase. Waste causes environmental pollution, and useful resources contained therein are discarded. Therefore, it is important to efficiently treat and recover the waste.

Waste can be largely classified into domestic waste generated in the living environment and workplace waste generated in industrial sites. Workplace waste is classified into workplace general waste, workplace emission waste, workplace construction waste, and workplace designated waste, depending on the source. These can be classified into organic waste and inorganic waste in terms of the properties of the materials.

In general, organic waste includes food waste, livestock manure, servings, wastes from agricultural and aquatic product processing, wastes from food processing and waste from slaughterhouses. Such organic wastes have a high moisture content and high concentrations of pollutants discharged, and thus are difficult to treat.

Among these, incineration treatment requires a huge fuel cost, and incineration residues such as dust and dioxins generated during incineration cause secondary environmental pollution. In the case of landfill, it is difficult to secure a landfill site, and there is a problem in that surrounding soil and rivers are contaminated by leachate generated from waste. On the other hand, composting or foddering is a treatment method that can recycle wastes as a resource, and various studies have been conducted.

In order to recycle wastes with high water content as compost or feed, the first thing to do is to reduce the moisture in the wastes. In order to quickly reduce the moisture contained in the waste, a waste drying apparatus using a burner is mainly used.

Such a conventional waste drying apparatus is disclosed in Korea Patent Publication No. 2001-0078900 (August 22, 2001.). The drying apparatus disclosed in the above publication includes a drying furnace provided with an inlet for waste at its tip and rotatably supported on a base, a rotary blade and a transfer blade respectively provided on the outer and inner cylinders of the drying furnace, and a burner device for heat supply. And a radiant heat device installed in the center of the inner cylinder so as to transfer heat supplied from the burner device to radiate heat downward, and a discharge screw installed below the outer cylinder to discharge the dry items to the outside.

However, the conventional waste drying apparatus as described above transfers the heat generated from the burner to the drying furnace through a radiant heat device disposed at the center of the drying furnace, resulting in low drying efficiency, high fuel consumption of the burner, and high operating and maintenance costs. It takes

In addition, in the conventional waste drying apparatus, since a radiant heat apparatus is disposed inside a drying furnace in which waste is input and transported, waste transfer efficiency is reduced, and waste is not smoothly crushed or agitated.

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and an object of the present invention is to provide a waste drying apparatus capable of quickly and efficiently drying waste having a high water content using a small amount of fuel.

In addition, the present invention is to provide a waste drying apparatus that can increase the drying efficiency of the added waste by increasing the contact time of the waste and hot air and the hot air contact area of the waste by effectively crushing and stirring the waste introduced into the drying drum.

Waste drying apparatus according to the present invention for achieving the above object, the inner drum having an inlet and an outlet provided at one end and the other end so as to be connected to the drying chamber and the drying chamber and the inner drum outside the inner drum to surround the inner drum; A drying drum including an outer drum disposed to be spaced apart from the drum and a flow path provided between an outer circumferential surface of the inner drum and an inner circumferential surface of the outer drum, and one end of the inner drum is rotatably coupled to the inlet of the inner drum. A hot air supply duct, an exhaust duct disposed outside the inner drum to surround the outer circumferential surface of one end of the inner drum and rotatably coupled to one end of the outer drum, and connected to the flow path, and the other end of the drying drum rotated. A waste discharge hopper which is coupled to be connected to the outlet of the inner drum and the flow path, A drum rotating device for rotating the drying drum by providing a rotational force to the drum, a hot air supply device for generating hot air to supply hot air to the drying chamber of the drying drum through the hot air supply duct, and through the inlet of the inner drum A waste injecting device for injecting waste into the drying chamber and a waste crushing device for crushing waste introduced into the drying chamber.

The waste drying apparatus according to the present invention includes an air supply pipe connected to the hot air supply device, a blower connected to the air supply pipe to forcibly blow air to the hot air supply device, and an outside air intake port for sucking outside air. And a waste heat recovery unit connected to the air supply pipe and the exhaust duct, wherein the drying chamber discharge air introduced into the waste heat recovery unit from the exhaust duct is supplied to the hot air supply unit through the air supply pipe together with the outside air sucked through the outside air inlet. Can be supplied to.

The hot wind supply device includes a combustion housing provided with a combustion chamber therein, a hot wind supply pipe connecting the combustion housing and the hot wind supply duct, coupled to the combustion housing to generate a flame, and to heat the air in the combustion chamber. It may include a burner that receives air through the supply pipe.

It may further include a heat insulating member surrounding the outer drum.

The waste shredding device includes a rotating shaft rotatably disposed in the drying chamber, a driving device for rotating the rotating shaft by providing a rotating force to the rotating shaft, and a plurality of blade assemblies coupled to the rotating shaft, wherein the blade The assembly may include a blade holder having a shaft fixing part fixed to the rotation shaft and a blade coupling part provided to protrude outwardly to the shaft fixing part, and a plurality of blades coupled to the blade coupling part.

The blade coupling portion may be coupled to a plurality of blades.

The blade may be disposed parallel to the axis of rotation.

Each blade engaging portion provided in any one of two blade assemblies disposed adjacent to each other on the rotating shaft may be disposed between a plurality of blade coupling portions provided in another blade assembly when viewed in the axial direction of the rotating shaft. .

In the waste drying apparatus according to the present invention, by providing a flow path between the inner drum and the outer drum and flowing hot air passing through the drying chamber along the flow path, the width of the temperature drop inside the drying chamber by the outside air around the drying drum is reduced and the heat is reduced. Losses can be reduced, thereby increasing the drying efficiency of the waste in the drying chamber.

In addition, the waste drying apparatus according to the present invention can recover the waste heat discarded by recycling the waste heat by supplying the hot air discharged from the drying chamber to the hot air supply device again through the waste heat recovery machine. Therefore, the drying efficiency of the waste can be further increased, and the energy required to generate hot air can be reduced.

In addition, the waste drying apparatus according to the present invention is a waste shredding apparatus having a plurality of blade assemblies having a plurality of blades disposed in parallel with the rotation axis by effectively crushing and stirring the waste introduced into the drying chamber, the contact time of the waste and hot air and The hot air contact area of the waste can be increased, thereby further shortening the drying time of the waste and further increasing the drying efficiency of the waste.

1 is a side view showing a waste drying apparatus according to an embodiment of the present invention.
2 is a plan view showing a waste drying apparatus according to an embodiment of the present invention.
Figure 3 is a front sectional view showing a part of the waste drying apparatus according to an embodiment of the present invention.
Figure 4 is a plan view showing a waste shredding apparatus of a waste drying apparatus according to an embodiment of the present invention.
5 is a side view showing a waste shredding apparatus of a waste drying apparatus according to an embodiment of the present invention.
6 is a perspective view showing the blade assembly of the waste shredding apparatus shown in FIG. 4 and FIG.

Hereinafter, with reference to the accompanying drawings, a waste drying apparatus according to the present invention will be described in detail.

In describing the present invention, the sizes and shapes of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

1 is a side view showing a waste drying apparatus according to an embodiment of the present invention, Figure 2 is a plan view showing a waste drying apparatus according to an embodiment of the present invention, Figure 3 is a waste according to an embodiment of the present invention Front sectional view showing a part of the drying apparatus.

1 to 3, the waste drying apparatus 100 according to an embodiment of the present invention, the hot air supply duct 130 for rotatably supporting the drying drum 110 and one end of the drying drum 110 ) And an exhaust duct 133, a waste discharge hopper 136 rotatably supporting the other end of the drying drum 110, and a drum rotation to rotate the drying drum 110 by providing rotational force to the drying drum 110. Device 140, a hot air supply device 150 for supplying hot air to the drying drum 110, a waste input device 160 for introducing waste into the drying drum 110, and the drying drum 110 It includes a waste shredding device 170 for shredding the waste introduced into. The waste drying apparatus 100 crushes and dries the waste having a high water content along the drying drum 110.

The drying drum 110 includes an inner drum 111 and an outer drum 116 surrounding the inner drum 111. The inner drum 111 is provided with a drying chamber 112 into which waste is introduced, and an inlet 113 and an outlet 114 connected to the drying chamber 112. The inlet 113 is provided at one end of the inner drum 111 for the inflow of waste and hot air, and the outlet 114 is provided at the other end of the inner drum 111 for the discharge of the dried waste and hot air. The length of the inner drum 111 is longer than the length of the outer drum 116 so that one end of the inner drum 111 protrudes from one end of the outer drum 116. One end of the inner drum 111 is rotatably supported by the hot air supply duct 130, and the other end of the inner drum 111 is rotatably supported by the waste discharge hopper 136.

The inner circumferential surface of the inner drum 111 is provided with a plurality of lifters 115 for pumping waste introduced into the drying chamber 112. When the inner drum 111 rotates, the plurality of lifters 115 spreads the waste in the lower part of the drying chamber 112 in the upward direction, and the wastes lifted by the lifter 115 move downward in the upper direction of the drying chamber 112. Will fall. Therefore, the waste may be uniformly stirred in the drying chamber 112, the time for the waste contact with the hot air supplied to the drying chamber 112 is increased, the area in contact with the hot air of the waste is increased, the drying efficiency is improved.

The outer drum 116 is disposed outside the inner drum 111 to surround the inner drum 111. One end of the outer drum 116 is rotatably supported by the exhaust duct 133, and the other end of the outer drum 116 is rotatably supported by the waste discharge hopper 136 together with the inner drum 111. An inner diameter of the outer drum 116 is larger than an outer diameter of the inner drum 111, and the outer drum 116 is supported by the plurality of coupling members 117 and spaced apart from the inner drum 111.

A flow path 118 is provided between the inner drum 111 and the outer drum 116, and the air passing through the drying chamber 112 flows along the flow path 118. That is, the air discharged through the outlet 114 of the inner drum 111 flows into the flow path 118 through the inlet 119 provided at the other end of the outer drum 116 and flows along the flow path 118 and then the external drum. It is discharged to the exhaust duct 133 through the outlet 120 provided at one end of the 116.

The hot air supplied to the drying chamber 112 has a low temperature as the waste is dried in the drying chamber 112 and the temperature of the air discharged from the internal drum 111 is lower than that of the hot air flowing into the inlet of the internal drum 111. , Is higher than the outside air temperature of the drying drum (110). Therefore, when the flow path 118 is provided between the inner drum 111 and the outer drum 116 and the air passing through the drying chamber 112 is flowed along the flow path 118, the air around the drying drum 110 is formed. By reducing the temperature fall width inside the drying chamber 112 can reduce the heat loss. In order to further reduce heat loss of the drying drum 110, a plurality of insulating members 121 are provided on the outer circumferential surface of the outer drum 116. The insulating member 121 may be made of a variety of heat insulating materials.

The drying drum 110 is rotatably supported by the hot air supply duct 130, the exhaust duct 133, and the waste discharge hopper 136 fixed to the frame 102. Specifically, one end of the inner drum 111 is rotatably fitted into the opening provided in the hot air supply duct 130, and the inlet 113 of the inner drum 111 is connected to the hot air supply duct 130. One end of the outer drum 116 is rotatably fitted into an opening provided in the exhaust duct 133, and an outlet 120 provided at one end of the outer drum 116 is connected to the exhaust duct 133. In addition, the other end of the outer drum 116 is rotatably fitted into the opening provided in the waste discharge hopper 136, provided on the other end of the inlet 119 and the inner drum 111 provided on the other end of the outer drum 116. The outlet 114 is connected to the waste discharge hopper 136.

The hot air supply duct 130 rotatably supports one end of the internal drum 111 and guides the hot air generated from the hot air supply device 150 to the drying chamber 112 of the internal drum 111. The hot air supply duct 130 is combined with the internal wind 111 as well as the hot air supply device 150, waste input device 160 and waste shredding device 170. The waste input device 160 and the waste shredding device 170 penetrate the hot air supply duct 130, and a part of the waste input device 160 is located in the drying chamber 112. Coupling portion between the hot air supply duct 130 and the inner drum 111, the coupling portion between the hot air supply duct 130 and the waste input device 160, the hot air supply duct 130 and waste shredding device 170 The coupling part between them is sealed by a sealing member or the like.

The exhaust duct 133 serves to guide the air passing through the flow path 118 toward the waste heat recoverer 157 in addition to the function of rotatably supporting the external drum 116. The exhaust duct 133 is disposed to surround the inner drum 111 on the outside of the inner drum 111. The coupling portion between the exhaust duct 133 and the outer drum 116 and the coupling portion between the exhaust duct 133 and the inner drum 111 are sealed by a sealing member or the like.

The waste discharge hopper 136 rotatably supports the other end of the inner drum 111 and the other end of the outer drum 116 and temporarily stores the dried waste discharged through the outlet 114 of the inner drum 111. . In addition to the waste discharged through the outlet 114 of the inner drum 111, the waste discharge hopper 136 is also introduced into the air discharged through the outlet 114, through the outlet 114 in the drying chamber 112 Air discharged to the waste discharge hopper 136 is introduced into the flow path 118 through the inlet 119 provided at the other end of the outer drum 116. A discharge port 137 is provided below the waste discharge hopper 136, and the waste stored in the waste discharge hopper 136 may be discharged to the outside through the discharge hole 137.

 The drying drum 110, which is rotatably supported by the hot air supply duct 130, the exhaust duct 133, and the waste discharge hopper 136, has a lower end than the one end provided with the inlet 113. It may be placed at a slight inclination from the ground to position. When the outlet 114 of the drying drum 110 is lower than the inlet 113, the waste introduced into the drying chamber 112 through the inlet 113 may be more smoothly transferred toward the outlet 114. A ring-shaped rolling ring 122 is provided in the middle of the outer circumferential surface of the outer drum 116, and the rolling ring 122 is rotatably supported by a supporting roller 106 provided on the frame 104.

As shown in FIGS. 1 and 3, the drying drum 110 is rotated by the drum rotating device 140. The drum rotating device 140 includes a ring gear 141 coupled to an outer circumferential surface of the outer drum 116, a drive gear 142 geared to the ring gear 141, and a motor for rotating the drive gear 142 ( 143). The motor 143 is fixed to the frame 104. When the driving gear 142 is rotated by the motor 143, the driving drum 142 and the ring gear 141 connected to the gear is interlocked so that the drying drum 110 rotates. In the present invention, the structure of the drum rotating device 140 is not limited to that shown, and may be changed to various other structures capable of rotating the drying drum 110.

1 and 2, the hot air supply device 150 includes a combustion housing 151 provided with a combustion chamber 152 therein, and a hot air supply pipe connecting the combustion housing 151 and the hot air supply duct 130 to each other. 153 and a burner 154 that generates a flame and heats the air in the combustion chamber 152. Burner 154 is coupled to one end of combustion housing 151 to inject flame into combustion chamber 152. The burner 154 is connected to an air supply pipe 155 for supplying air, and the air supply pipe 155 is provided with a blower 156 for forcibly blowing air to the burner 154 through the air supply pipe 155. . The air forcedly blown by the blower 156 to the burner 154 through the air supply pipe 155 is heated in the combustion chamber 152 and then the drying drum 110 through the hot air supply pipe 153 and the hot air supply duct 130. Flows into the drying chamber 112.

The waste heat recovery unit 157 is connected to the end of the air supply pipe 155. The waste heat recovery unit 157 includes an outside air inlet 158 for sucking outside air and is connected to the exhaust duct 133 through an exhaust pipe 159. Air passing through the drying chamber discharged to the exhaust duct 133 flows into the waste heat recovery unit 157 through the exhaust pipe 159. The drying chamber passing air introduced into the waste heat recoverer 157 is supplied to the hot air supply device 150 through the air supply pipe 155 together with the outside air introduced into the waste heat recoverer 157 through the outside air inlet 158. As such, when the waste heat recoverer 157 is used, waste heat that is discarded can be recovered and recycled for drying the waste, thereby reducing energy waste and improving waste drying efficiency.

The waste input device 160 is fixedly installed in the frame 102 and penetrates through the hot air supply duct 130, and a part thereof is located in the drying chamber 112 of the drying drum 110. The user may inject waste into the drying chamber 112 through the waste input device 160. Although the waste injector 160 is shown as having a screw conveyor structure in the drawing, the structure of the waste injector 160 is not limited to that shown and may be variously changed.

1 to 4, the waste shredding device 170 is fixed to the frame 102, penetrates through the hot air supply duct 130, a part of which is in the drying chamber 112 of the drying drum 110 Located. The waste shredding device 170 includes a pair of shredders 171 disposed in parallel to each other in the drying chamber 112 and a pair of driving devices 179 for rotating the pair of shredders 171, respectively. Of course, the number of shredders 171 is not limited to two, but may be one, or three or more, and one driving device 179 may rotate a plurality of shredders 171 at the same time.

As shown in FIGS. 4 to 6, the crusher 171 includes a rotating shaft 172 rotated by the driving device 179 and a plurality of blade assemblies 173 coupled to the rotating shaft 172. The blade assembly 173 includes a blade holder 174 fixed to the rotation shaft 172 and a plurality of blades 178 coupled to the blade holder 174.

The blade holder 174 includes a shaft fixing part 175 having a coupling hole 176 fitted into the rotation shaft 172, and a plurality of blade coupling parts 177 provided to protrude from the shaft fixing part 175. The shaft fixing unit 175 may be fitted to the rotating shaft 172 and then fixed to the rotating shaft 172 by various methods such as mechanical coupling by a fastening mechanism such as welding or bolt. The plurality of blade coupling portions 177 are disposed to be spaced apart at a predetermined angle from the edge of the shaft fixing unit 175. Each blade coupling portion 177 is spaced apart at regular intervals so that the plurality of blades 178 are parallel to each other. When the blade assembly 173 is coupled to the axis of rotation 172, the blade 178 lies in parallel with the axis of rotation 172.

3 and 4, the blade assembly 173 is disposed to be spaced apart from each other along the longitudinal direction of the rotation shaft 172. Each blade engaging portion 177 of the blade assembly 173 of any of the two blade assemblies 173 disposed adjacent to each other on the axis of rotation 172 has a different view in the axial direction of the axis of rotation 172. It is disposed between the plurality of blade coupling portion 177 provided in the blade assembly 173. By coupling the plurality of blade assemblies 173 to the rotating shaft 172 in this form, it is possible to increase the crushing efficiency for the waste in the drying chamber 112, the problem that the waste is caught between the blade assembly 173 and the like. Can be reduced.

In the present invention, the structure of the waste shredding device 170 is not limited to that shown. That is, the waste shredding device 170 may be changed to various other structures that can shred the waste introduced into the drying chamber 112.

As described above, the waste drying apparatus 100 according to the present invention provides a flow path 118 between the inner drum 111 and the outer drum 116 and passes through the drying chamber 112 along the flow path 118. By flowing high temperature air, it is possible to reduce the temperature drop width inside the drying chamber 112 by the air around the drying drum 110 and to reduce the heat loss, and to increase the drying efficiency of the waste in the drying chamber 112. .

In addition, the waste drying apparatus 100 according to the present invention supplies hot air discharged from the drying chamber 112 to the hot air supply device 150 through the waste heat recovery unit 157 again, thereby recovering the waste heat that is discarded to waste drying. Can be recycled. Therefore, it is possible to further increase the drying efficiency of the waste and reduce the energy required for generating hot air.

In addition, the waste drying apparatus 100 according to the present invention includes a drying chamber 112 as a waste shredding apparatus 170 having a plurality of blade assemblies 173 having a plurality of blades 178 disposed in parallel with the rotating shaft 172. Waste introduced into the furnace can be effectively crushed and stirred. Therefore, it is possible to further increase the drying efficiency of the waste and to shorten the drying time of the waste.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical idea of the present invention in various forms. Accordingly, these modifications and variations are intended to fall within the scope of the present invention as long as it is obvious to those skilled in the art.

100: waste drying apparatus 110: drying drum
111: internal drum 112: drying chamber
115: lifter 116: external drum
118: euro 121: thermal insulation member
122: rolling ring 130: hot air supply duct
133: exhaust duct 136: waste discharge hopper
140: drum rotating device 141: ring gear
142: drive gear 143: motor
150: hot air supply device 151: combustion housing
152: combustion chamber 153: hot air supply pipe
154: burner 155: air supply pipe
156: blower 157: waste heat recovery
159: exhaust pipe 160: waste input device
170: waste shredding device 171: shredder
172: axis of rotation 173: blade assembly
174: blade holder 178: blade

Claims (8)

An inner drum having an inlet and an outlet provided at one end and the other end to be connected to a drying chamber and the drying chamber, an outer drum disposed to be spaced apart from the inner drum outside the inner drum to surround the inner drum, Flow paths provided between an outer circumferential surface and an inner circumferential surface of the outer drum, a plurality of coupling members disposed between the inner drum and the outer drum and spaced apart from each other, and connected to both ends of the outer drum to be connected to the flow path, A drying drum including an inlet and an outlet provided therein, and an insulating member surrounding the outer drum;
One end of the inner drum is rotatably coupled to the hot air supply duct connected to the inlet of the inner drum;
An exhaust duct disposed outside the inner drum to surround the outer circumferential surface of one end of the inner drum, and one end of the outer drum rotatably coupled to the outlet;
A waste discharge hopper which is rotatably coupled to the other end of the drying drum and connected to an outlet of the inner drum and an inlet of the outer drum;
A drum rotating device for rotating the drying drum by providing a rotational force to the drying drum;
To generate hot air to supply hot air to the drying chamber of the drying drum through the hot air supply duct, a combustion housing having a combustion chamber therein, a hot air supply pipe connecting the combustion housing and the hot air supply duct, and generating a flame A hot air supply device having a burner coupled to the combustion housing to heat air in the combustion chamber;
A waste input device for injecting waste into the drying chamber through an inlet of the inner drum;
A waste crushing apparatus disposed at an inlet side of the inner drum to crush waste introduced into the drying chamber;
An air supply pipe connected to the hot air supply device;
A blower connected to the air supply pipe to forcibly blow air to the hot air supply device; And
And a waste heat recovery unit having an outside air inlet for sucking outside air and connected to the air supply pipe and the exhaust duct.
The drying drum is inclined from the ground so that the outlet is located lower than the inlet,
And a drying chamber discharge air introduced into the waste heat recovery unit from the exhaust duct may be supplied to the hot air supply device through the air supply pipe together with the outside air sucked through the outside air inlet.
delete delete delete The method of claim 1,
The waste shredding device,
A rotating shaft rotatably disposed in the drying chamber;
A driving device for rotating the rotating shaft by providing a rotating force to the rotating shaft;
A plurality of blade assemblies coupled to the rotational shaft,
The blade assembly includes a blade holder having a shaft fixing portion fixed to the rotating shaft and a blade coupling portion provided to protrude outwardly to the shaft fixing portion, and a plurality of blades coupled to the blade coupling portion. Device.
The method of claim 5, wherein
Waste blades, characterized in that the blade is coupled to the plurality of blade coupling portion.
The method of claim 5, wherein
The blade drying apparatus, characterized in that the blade is disposed parallel to the axis of rotation.
The method of claim 5, wherein
Each blade coupling portion provided in any one of two blade assemblies disposed adjacent to each other on the rotation axis is disposed between the plurality of blade coupling portions provided in another blade assembly when viewed in the axial direction of the rotation shaft. Waste drying apparatus.

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