KR102405927B1 - Apparatus for drying sawdust - Google Patents

Abstract

The present invention relates to a sawdust drying apparatus that can perform drying using solar heat and hot air together or selectively, and a frame and each of a plurality of layers inclined up and down on one side of the frame while forming a plurality of layers, long and left and right, After receiving sawdust from the uppermost layer, a plurality of conveying units for transferring and discharging the sawdust to the lowermost layer, and a drying unit for drying by applying heat to the sawdust conveyed through each of the conveying units, each of the conveying units is a circular pipe A lower frame in the shape of a semicircular pipe of the lower part cut in half, the lower frame having an outlet opening and protruding from the right lower surface, a lower insulating cover coupled to surround the lower outer circumferential surface of the lower frame, and the upper and lower parts of the circular pipe An upper semicircular pipe shape cut in half, and an upper frame made of a light-transmitting material having an inlet that is opened upward and protruding on the left side, and rotatably installed inside when the lower frame and the upper frame are combined, the upper When the sawdust is input through the inlet of the frame, a transfer screw for transferring the sawdust to the outlet of the lower frame so that the sawdust is discharged, and an upper insulating cover installed so as to be able to move up and down to open and close the upper outer peripheral surface of the upper frame characterized in that

Description

Sawdust dryer {APPARATUS FOR DRYING SAWDUST}

The present invention relates to a sawdust drying apparatus that dries the moisture content contained in wood chips or sawdust generated from logging sites, furniture factories, or lumber mills according to a desired purpose of use.

In general, various equipment and technologies for producing and manufacturing wood chips from recycled wood chips and wood wastes generated from construction sites, industrial sites, and logging fields, and sawdust generated from furniture factories or lumber mills, etc. are being developed.

The wood chips or sawdust crushed as described above are dried moisture and delivered to a wood processing plant, for example, used as a raw material for compressed plywood, or reprocessed to be used as a moisture control material or pellets in organic fertilizer factories, farmhouses or livestock houses. do.

This sawdust has several unique physical and chemical properties compared to other industrial granules, such as compost or feed, sand or cement. As a typical feature, sawdust is a combustible material, and although the strength of each granular body is not excellent, the overall density is relatively dense. In addition, the moisture content is not excessive compared to compost or feed, but it also contains sticky ingredients such as rosin, so it has a high density characteristic and hardens by agglomeration.

In general, the process of drying such sawdust can be divided into a process of putting sawdust into a drying device, a high-temperature drying process using a heat source inside the drying device, and then a process of discharging sawdust dried to a desired level from the drying device.

The sawdust drying device for drying sawdust during the above-described sawdust drying process is not simply a large area of outdoor, such as a yard, spread sawdust widely and naturally dried through solar heat or blowing wind, but space utilization as a device or system. It is a device that dries sawdust in large quantities to the desired moisture content through increased properties and short drying time.

Accordingly, the sawdust drying apparatus is of course provided with a frame provided with an input unit into which sawdust is input and a discharge unit through which the sawdust is discharged, and a transfer unit installed between the input unit and the discharge unit to transfer the sawdust and the sawdust transferred through the transfer unit. A drying unit is inevitably provided for drying by applying heat. For example, there are the 'sawdust dryer' of Korean Patent Publication No. 10-0837228, the 'sawdust drying device' of Korean Patent Publication No. 10-0967433, and the 'mushroom medium dryer' of Korean Patent Publication No. 10-2014-0115851.

The conveying part of the sawdust drying apparatus according to the prior art has a rotating cylindrical conveying structure in consideration of the physical and chemical characteristics of the above-described sawdust, but a screw conveying structure is usually adopted in many cases. In addition, the drying unit that dries by applying heat to sawdust uses various heat sources, either directly applying the heat of a flame by burning fuel or using an electric heater, or drying the air with hot air by heating it to a high temperature.

However, the sawdust drying apparatus according to the prior art described above, because it is necessary to burn fuel or continuously perform the use of an electric heater or hot air drying for drying the sawdust, the operating cost is consumed too large and the profitability is low.

An object of the present invention devised to solve the above problems is that, when drying sawdust, drying using solar heat and drying using hot air can be performed together or selectively, so that operating costs can be significantly reduced and profitability can be increased. To provide a sawdust dryer.

In order to achieve the above object, the sawdust drying apparatus according to the present invention includes a frame having a front side inclinedly formed, and each of a plurality of layers inclined up and down on one side of the frame while forming a plurality of layers long and left and right, each A plurality of transfer units arranged in a zigzag manner so that the left and right directions are reversed in order from the uppermost layer to the lowermost layer, and after receiving sawdust from the uppermost layer, the sawdust is transported and discharged to the lowermost layer; and a drying unit for drying by applying heat, wherein each of the conveying units has a lower semicircular pipe shape in which the upper and lower parts of the round pipe are cut in half, and a lower frame with an outlet opening and protruding outlet opening on the right lower surface thereof; and the lower frame A lower insulating cover coupled to surround the lower outer circumferential surface of the upper and lower half-circular pipe shape of the upper and lower parts of the circular pipe cut in half, and an upper frame made of a light-transmitting material having an inlet protruding and opening upwards on the left side, and the lower part A transfer screw that is rotatably installed inside when the frame and the upper frame are combined, and transfers the sawdust to the outlet of the lower frame so that the sawdust is discharged to the outlet of the lower frame when the sawdust is input through the inlet of the upper frame, and the upper frame It characterized in that it comprises an upper insulating cover installed so as to be able to lift up and down to open and close the upper outer peripheral surface of the.

In addition, the lower frame further includes a plurality of intake pipes that are opened and protruded downward in the left and right longitudinal direction, and the upper frame further includes a plurality of exhaust pipes that are opened and protruded upward in the left and right longitudinal directions. Including, the drying unit, an air dryer for supplying hot air heated with high-temperature air to the inside of the transfer unit through the intake pipe of each of the lower frame after sucking in the external air, and moisture from the sawdust and an exhaust fan for exhausting the air inside the transfer unit to the outside through an exhaust pipe of each of the upper frames.

In addition, the lower frame further includes an intake filter coupled to each of the intake pipes to filter the sawdust from flowing down, and the upper frame is coupled to each of the exhaust pipes to filter the sawdust from being discharged. It is characterized in that it further comprises.

In addition, the drying unit may include an intake manifold that receives the hot air supplied from the air dryer and distributes it to each intake pipe of the lower frame, and receives and collects air discharged from each exhaust pipe of the upper frame to collect the exhaust fan. It is characterized in that it further comprises an exhaust manifold for transferring to.

In addition, it further comprises a lifting unit for lifting and lowering the upper insulating cover of each of the transfer units up and down, the lifting unit, a winding motor rotating forward and reverse, and a winding roller that receives rotational force from the winding motor to rotate forward and reverse, and one end of the winding A lifting wire wound on a roller and having the other end connected to the upper surface of the upper insulating cover, and the other end of the lifting wire so that the upper insulating cover can ascend and descend when one end of the lifting wire is wound or unwound on the winding roller It is characterized in that it includes a guide roller for guiding vertically.

In addition, further comprising a control unit for controlling the operation of the transfer unit, the drying unit and the lifting unit, the controller stops the operation of the air dryer of the drying unit, and controls the lifting unit to raise the upper insulating cover so that the upper frame is A solar drying mode that opens to be exposed, a hot air drying mode in which the upper frame is closed by lowering the upper insulating cover by controlling the lifting unit, and the air dryer of the drying unit is operated, and the air dryer of the drying unit is operated, It characterized in that it comprises a hybrid drying mode in which the upper frame is opened by controlling the lifting unit to raise the upper insulating cover.

In addition, in each of the transfer units between the adjacent upper and lower layers whose left and right directions are reversed from each other, it characterized in that it further comprises an oblique connecting pipe for obliquely connecting the outlet of the upper transfer unit and the inlet of the lower transfer unit.

In addition, it characterized in that it further comprises a collection hopper or a collection conveyor installed at the outlet of the lowermost transfer unit in each of the transfer units, and the uppermost lowermost input hopper installed at the inlet of the uppermost transfer unit in each of the transfer units.

In addition, it characterized in that it further comprises a plurality of moving wheels installed in the lower portion of the frame.

The sawdust drying apparatus according to the present invention can perform drying using solar heat through an upper frame made of a light-transmitting material when drying sawdust, and can perform drying using hot air through an air dryer, and is lifted by a lifting unit As the upper frame is opened and closed by the upper insulating cover, solar drying and hot air drying can be performed together or selectively, thereby significantly reducing operating costs and increasing profitability.

1 is a perspective view showing an embodiment of a sawdust drying apparatus according to the present invention;
2 is a perspective view showing a plurality of transfer units and their coupling relationship in the embodiment of FIG. 1;
Figure 3 is a perspective view showing the input, drying and discharge process of sawdust after installing the input hopper and the collection box in the embodiment of Figure 2,
4 is a perspective view of a main part separately showing only a single transfer unit in the embodiment of FIG. 1;
Figure 5 is an exploded perspective view of the embodiment of Figure 4,
6 is a perspective view showing the main part of the intake and exhaust relationship between the air dryer and the exhaust fan of the drying unit with respect to the plurality of transfer units in the embodiment of FIG. 1;
7 is a perspective view showing the opening and closing process according to the elevation of the upper insulating cover with respect to the upper frame based on the embodiment of FIG. 4;
8 is a perspective view of the main part separately showing only the lifting unit for lifting and lowering the upper insulating cover in the embodiment of FIG. 1;
9 is a perspective view illustrating a state in which the upper insulating cover of each of the plurality of transfer units is raised and the upper frame is opened based on the embodiment of FIG. 2 .

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

The sawdust drying apparatus according to the present invention includes a frame 100, a plurality of conveying units 200 and a drying unit 300, as shown in FIGS. 1 to 9, and the conveying unit 200 is each of the lower frame 210 ), a lower insulating cover 220 , an upper frame 230 , a transfer screw 240 and an upper insulating cover 250 . In addition, it may further include a lifting unit 400 , a control unit 500 , a diagonal connection pipe 600 , an input hopper 700 , a collection box 800 , and a moving wheel 900 .

The frame 100 is a structure for mounting and coupling each component to be described later as shown in FIG. 1 , and is formed with a front side inclined. Frame 100 is a beam structure in the drawing, but the front side is formed to be inclined in a stepwise manner, regardless of the type of structure, it is sufficient if the front side is formed to be inclined. The reason why the front side of the frame 100 is inclined is that a plurality of transfer units 200 to be described later are installed to be inclined along the inclined surface of the frame 100 so as not to interfere with the operation between the transfer units 200, This is to prevent interference between the upper and lower transfer units 200 as much as possible during drying of sawdust transferred along the transfer unit 200 , particularly during solar drying.

As shown in Figs. 1 to 3, the transfer unit 200 is provided in plurality, each of which forms a plurality of layers inclined up and down on one side of the frame 100 and is installed long from side to side, each in order from the top floor to the bottom floor It is arranged in a zigzag manner so that the left and right directions are reversed as shown, and after receiving sawdust from the uppermost layer, the sawdust is transported and discharged to the lowermost layer.

Although the transfer unit 200 is illustrated as having three three-layer structures in the drawing, four or five or more may be installed. However, in this case, in order for sawdust input from the transfer unit 200 of the uppermost layer to be discharged to the transfer unit 200 of the lowermost layer, the adjacent transfer units 200 must be inverted in the left and right directions.

For example, as shown in FIG. 3 , the uppermost three-layer transfer unit 200 receives sawdust from the upper left and then transfers it to the right to discharge the sawdust to the lower right, and the second-floor transfer unit 200 as the middle layer is the upper right. After receiving the sawdust discharged from the third-floor transfer unit 200, it is transferred to the left to discharge the sawdust to the lower left, and the first-floor transfer unit 200, which is the lowest layer, is discharged from the second-floor transfer unit 200 from the upper left. After receiving the sawdust being input, it is transferred to the right and the sawdust is discharged to the lower right.

Looking at the specific configuration of each of these transfer units 200, as shown in FIGS. 4 and 5, the lower frame 210, the lower insulating cover 220, the upper frame 230, the transfer screw 240, and the upper insulating cover ( 250).

The lower frame 210 has a shape of a lower semi-circular pipe cut in half by cutting the upper and lower parts of the circular pipe, and an outlet 211 protruding by opening downwardly on the right lower surface is formed. There is no need to separately limit the material of the lower frame 210 , but it is preferable to be made of a material with high thermal conductivity for uniform heat transfer of sawdust transferred along the lower frame 210 . However, since there is a risk that heat loss may occur through the lower surface of the lower frame 210 as the heat transfer of the lower frame 210 is high, the lower insulating cover 220 is provided to prevent this.

The lower insulating cover 220 is coupled to surround the lower outer circumferential surface of the lower frame 210 . That is, the lower heat insulating cover 220 is coupled to the lower portion of the lower frame 210 with a heat insulating material, as can be seen from its name, to block heat loss generated through the lower surface of the lower frame 210. .

The upper frame 230 has an upper semicircular pipe shape in which the upper and lower parts of the circular pipe are cut in half so as to be symmetrical with the lower frame 210, and is made of a light-transmitting material and is opened toward the left side and protruding inlet 231 is formed. . The characteristic of this upper frame 230 is that the material is a light-transmitting material, for example, a transparent material such as glass or PC (polycarbonate) among synthetic resins so that sunlight can pass through and the sawdust inside can be dried with solar heat. is the composition That is, the upper frame 230 is coupled to the upper portion of the lower frame 210 to form a circular pipe shape by combining the two, and unlike the lower frame 210, the upper frame 230 is made of a light-transmitting material, so that solar drying is possible. configured to be possible.

In addition, the sawdust is input through the inlet 231 of the upper frame 230 and transported through the passage coupled between the lower frame 210 and the upper frame 230 to the outlet 211 of the lower frame 210 . is emitted as Here, the transfer screw 240 is installed for transferring the sawdust.

The transfer screw 240 is rotatably installed inside when the lower frame 210 and the upper frame 230 are coupled, and when the sawdust is input through the inlet 231 of the upper frame 230, the lower frame The sawdust is transferred to the outlet 211 of the 210 so that the sawdust is discharged. The structure of such a transfer screw 240 is as widely known, and although reference numerals are not shown in the drawings, a screw shaft having a screw blade formed therein, and a screw rotation motor for rotating the screw shaft are provided.

The upper heat insulating cover 250 is installed so as to open and close the upper outer peripheral surface of the upper frame 230 as shown in Figs. First, the upper insulating cover 250 is also made of an insulating material, similar to the above-described lower insulating cover 220 , and is coupled to the upper portion of the upper frame 230 to generate heat loss through the upper surface of the upper frame 230 . It is configured to block However, as described above, since the upper frame 230 is made of a light-transmitting material and must be able to dry sawdust transferred therein by solar drying, the upper outer peripheral surface of the upper frame 230 can be opened and closed according to weather or temperature. There is a feature in that the upper insulating cover 250 is installed so that it can be lifted.

When the sawdust is transferred through the plurality of transfer units 200 having these structural characteristics, a drying unit 300 capable of drying the sawdust by applying heat is required. That is, the drying unit 300 dries by applying heat to the sawdust conveyed through each of the conveying units 200 as shown in FIGS. 1, 4 and 6 . For example, in order to forcibly apply heat to sawdust, there will be various methods such as fossil fuels, electric heaters, or hot air drying for the configuration of the drying unit 300 as various heat sources. However, in the present invention, as a specific example of the drying unit 300, it is intended to increase the drying efficiency of sawdust through hot air drying.

To this end, as shown in FIGS. 4 to 6 , the lower frame 210 further includes a plurality of intake pipes 212 that are opened and protrude downward along the left and right longitudinal directions, and the upper frame 230 includes It further includes a plurality of exhaust pipes 232 that are opened and protruded upward along the left and right longitudinal direction. In this case, as shown in FIGS. 1 and 6 , the drying unit 300 sucks in external air and then heats the hot air with high-temperature air through the intake pipe 212 of each of the lower frames 210 to the transfer unit. The air dryer 310 supplied to the inside of the 200 and the air inside the transfer unit 200 containing moisture from the sawdust are exhausted to the outside through the exhaust pipe 232 of each of the upper frame 230 An exhaust fan 320 may be included.

At this time, as shown in FIG. 5 , the lower frame 210 is coupled to each of the intake pipes 212 and an intake filter 213 for filtering the sawdust from flowing down through the open intake pipe 212 is further added. In addition, the upper frame 230 may further include an exhaust filter 233 coupled to each of the exhaust pipes 232 to filter the sawdust from being discharged through the open exhaust pipe 232 .

In addition, since the total number of the plurality of intake pipes 212 installed in the lower frame 210 of the plurality of transfer units 200 or the plurality of exhaust pipes 232 installed in the upper frame 230 is large, each of these is air dryer ( 310) or the exhaust fan 320, the connection work becomes difficult. Accordingly, the drying unit 300 may further include an intake manifold 330 and an exhaust manifold 340 as shown in FIGS. 1 and 6 to collect and distribute each as one. That is, the intake manifold 330 receives the hot air supplied from the air dryer 310 and distributes it to the intake pipes 212 of each of the lower frames 210 , and the exhaust manifold 340 receives the hot air supplied from the upper frame 210 . The air discharged from each exhaust pipe 232 of the frame 230 is received, collected, and delivered to the exhaust fan 32 .

On the other hand, as shown in FIGS. 7 and 9, the upper insulating cover 250 of each of the transfer units 200 can be lifted up and down to open and close the upper frame 230 made of a light-transmitting material for solar drying. 1 and 8, the lifting unit 400 is installed to elevate each of these upper insulating covers 250 up and down.

Specifically, the lifting unit 400 includes a winding motor 410 that rotates forward and reverse, a winding roller 420 that receives rotational force from the winding motor 410 and rotates forward and reverse, and one end is wound around the winding roller 420 . and a lifting wire 430 having the other end connected to the upper surface of the upper insulating cover 250, and when one end of the lifting wire 430 is wound or unwound on the winding roller 420, the upper insulating cover 250) It includes a guide roller 440 for vertically guiding the other end of the lifting wire so that it can be lifted up and down.

That is, when the winding motor 410 rotates forward and reverse, the lifting wire 430 rotates forward and reverse with the wound winding roller 420, and the lifting wire 430 moves up and down while lifting the upper insulating cover 250 up and down. will make it However, at this time, since the other end of the elevating wire 430 is connected to the upper insulating cover 250, the other end of the elevating wire 430 must be vertically elevated so that the upper insulating cover 250 can be lifted up and down. , To this end, one or two or more guide rollers 440 will guide the elevating wire 430 .

A control unit 500 for controlling the above-described operation units according to the user's needs is installed as shown in FIG. 1 , and the control unit 500 includes the conveying unit 200 , the drying unit 300 and the lifting unit 300 . control the operation of Specifically, the control unit 500 controls three modes, namely, a solar drying mode, a hot air drying mode, and a hybrid drying mode.

First, the solar drying mode is mainly operated in the daytime sunlight is strong, and is a mode in which sawdust is dried only by solar heat. That is, the control unit 500 stops the air dryer 310 of the drying unit 300 , and controls the lifting unit 400 to raise the upper insulating cover 250 to raise the upper frame 230 . open to expose it.

Next, the hot air drying mode is a mode that is mainly operated in cloudy weather such as no sunlight at night or rain even during the day, and only dries sawdust with hot air. That is, the control unit 500 controls the lifting unit 400 to lower the upper insulating cover 250 to close the upper frame 230 , and to operate the air dryer 310 of the drying unit 300 . make it work

Finally, the hybrid drying mode is a mode to minimize the moisture content of sawdust or to further lower the drying time while the daytime sunlight is strong. That is, the control unit 500 operates the air dryer 310 of the drying unit 300 , and controls the lifting unit 400 to raise the upper insulating cover 250 so that the upper frame 230 is open to expose.

On the other hand, in the sawdust drying apparatus according to the present invention, it may further include a diagonal connection pipe 600 , an input hopper 700 , a collection box 800 and a moving wheel 900 as other auxiliary facilities.

As shown in FIGS. 1 to 3 , the diagonal connection pipe 600 is the outlet 211 of the upper transfer unit 200 and the lower transfer unit 200 in each of the transfer units 200 between the adjacent upper and lower layers in which the left and right directions are reversed from each other. The inlet 231 is connected obliquely.

The input hopper 700 is installed in the inlet 231 of the uppermost transfer unit 200 in each of the transfer units 200 to facilitate the input of the first sawdust in the shape of the upper and lower halves as shown in FIG. 3, and the collection box (800) Alternatively, the collection conveyor is installed at the outlet 211 of the lowermost transfer unit 200 in each of the transfer units 200 to facilitate collection of the final dried sawdust.

As shown in FIG. 1 , a plurality of moving wheels 900 are provided and installed under the frame 100 , which is configured to move the frame 100 . For example, it will be possible to increase the efficiency of solar drying by moving the drying device indoors or outdoors, or by moving one side of the front side of the frame 100 to face the movement flow of the sun.

As described above, the sawdust drying apparatus according to the present invention can perform drying using solar heat through the upper frame 230 of a light-transmissive material when drying sawdust, and drying using hot air through the air dryer 310 is performed. As the upper frame 230 is opened and closed by the upper heat insulating cover 250 that is lifted by the lifting unit 400, solar drying and hot air drying can be performed together or selectively, thereby significantly reducing operating costs. This has the effect of increasing profitability.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit 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, such improvements and modifications will fall within the protection scope of the present invention as long as they are apparent to those of ordinary skill in the art.

100 : frame
200: transfer unit
210: lower frame 211: outlet
212: intake pipe 213: intake filter
220: lower insulation cover
230: upper frame 231: inlet
232: exhaust pipe 233: exhaust filter
240: transfer screw
250: upper insulation cover
300: drying unit
310: air dryer 320: exhaust fan
330: intake manifold 340: exhaust manifold
400: elevator
410: winding motor 420: winding roller
430: elevating wire 440: guide roller
500: control unit
600: diagonal connection pipe
700: input hopper
800 : collection box
900: moving wheel

Claims (9)

A frame with an inclined front side, and
Each is installed in a long left and right while forming a plurality of layers inclined up and down on one side of the frame, and each is arranged in a zigzag manner so that the left and right directions are reversed in order from the top layer to the bottom layer, after receiving sawdust from the top layer A plurality of conveying units for conveying and discharging the sawdust to the lowest layer;
and a drying unit for drying by applying heat to the sawdust conveyed through each of the conveying units,
Each of the transfer units,
A lower frame in the shape of a lower semicircular pipe cut in half by cutting the upper and lower parts of the round pipe in half, and having an outlet opening protruding from the lower right side of the lower frame;
a lower insulating cover coupled to surround the lower outer circumferential surface of the lower frame;
An upper frame made of a light-transmitting material in the shape of an upper semicircular pipe cut in half by cutting the upper and lower parts of the round pipe in half, and having an inlet protruding by opening upward on the left side,
A transfer screw which is rotatably installed inside when the lower frame and the upper frame are combined, and transfers the sawdust so that the sawdust is discharged to the outlet of the lower frame when the sawdust is input through the inlet of the upper frame;
Sawdust drying apparatus, characterized in that it comprises an upper insulating cover installed to be lifted up and down to open and close the upper outer peripheral surface of the upper frame.
According to claim 1,
The lower frame is
Further comprising a plurality of intake pipes that are opened and protruded downward along the left and right longitudinal direction,
The upper frame is
Further comprising a plurality of exhaust pipes that are opened and protruded upward along the left and right longitudinal direction,
The drying unit,
An air dryer for supplying hot air heated with high-temperature air to the inside of the transfer unit through intake pipes of each of the lower frames after sucking in external air;
and an exhaust fan for exhausting the air inside the transfer unit containing moisture from the sawdust to the outside through an exhaust pipe of each of the upper frame.
3. The method of claim 2,
The lower frame is
Further comprising an intake filter coupled to each of the intake pipe to filter the sawdust from flowing down,
The upper frame is
Sawdust drying apparatus characterized in that it further comprises an exhaust filter coupled to each of the exhaust pipe to filter the sawdust is not discharged.
3. The method of claim 2,
The drying unit,
an intake manifold receiving the hot air supplied from the air dryer and distributing it to the intake pipes of each of the lower frames;
Sawdust drying apparatus, characterized in that it further comprises an exhaust manifold for receiving and collecting the air discharged from the exhaust pipe of each of the upper frame and transfers to the exhaust fan.
3. The method of claim 2,
Further comprising an elevating unit for lifting and lowering the upper insulating cover of each of the transfer unit up and down,
The lifting unit,
a winding motor that rotates forward and reverse;
a winding roller which receives rotational force from the winding motor and rotates forward and reverse;
a lifting wire having one end wound on the winding roller and the other end connected to the upper surface of the upper insulating cover;
Sawdust drying apparatus comprising a guide roller for guiding the other end of the lifting wire vertically so that the upper insulating cover can be lifted up and down when one end of the lifting wire is wound or unwound by the winding roller.
6. The method of claim 5,
Further comprising a control unit for controlling the operation of the transfer unit, the drying unit and the lifting unit,
The control unit is
a solar drying mode in which the air dryer of the drying unit is stopped and the upper frame is opened by controlling the lifting unit to raise the upper insulating cover;
A hot air drying mode in which the upper heat insulating cover is lowered by controlling the lifting unit to close the upper frame, and the air dryer of the drying unit is operated;
and a hybrid drying mode in which the air dryer of the drying unit is operated, and the upper insulating cover is raised by controlling the lifting unit to expose the upper frame.
According to claim 1,
Sawdust drying apparatus, characterized in that it further comprises an oblique connecting pipe for obliquely connecting the outlet of the upper transfer unit and the inlet of the lower transfer unit in each of the transfer units between the adjacent upper and lower layers inverted in the left and right directions.
According to claim 1,
In each of the transfer units, an input hopper of the uppermost floor is installed at the inlet of the uppermost transfer unit,
Sawdust drying apparatus, characterized in that it further comprises a collection box or a collection conveyor installed at the outlet of the lowermost transfer unit in each of the transfer units.
According to claim 1,
Sawdust drying apparatus, characterized in that it further comprises a plurality of moving wheels installed on the lower portion of the frame.

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