JPH0861848A - Wood dryer - Google Patents

Abstract

PURPOSE: To provide a wood dryer which is capable of inexpensive manufacture, which is easily carried into a construction site and a manufacturing site, which completely eliminate various works at the sites, and which is capable of drying wood suitable for the sites. CONSTITUTION: A unit structure 2 includes an electric heater 2, a boiler 5, and a fan 3, and further includes a space 20b for drying wood therein. The unit structure 2 is formed with a rectangular parallelepiped box surrounded with a heat insulating wall over 6 surfaces thereof. The electric heater 4 is disposed in the box. The boiler 5 is mounted on an outer wall surface of the box. The fan 3 is mounted on a ceiling in the box so as for its fan air surface to be directed downward. Further, a pressure pump 52 is provided on an outer side wall of the unit structure 2 for introducing vapor produced from the boiler 5 into the box. Furthermore, the drying space 20b is formed with a space between the fan air surfaces of the fan 3 in the box and an inner wall surface facing to the air fan surface, and an exhaust cylinder 60 is formed for exhausting atmospheric air in the drying space 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood drying apparatus capable of easily drying wood.

[0002]

2. Description of the Related Art Workpieces made of wood are generally made by on-site processing. However, if wood is processed and used without being subjected to a drying treatment, natural drying will proceed after completion and dimensional error will occur. However, the work may be distorted or, in the worst case, damaged.

Therefore, the undried wood is dried by a user (mainly a construction shop or a construction company) by himself. Since natural drying requires a long period of time, wood is generally forced to be dried. The forced drying is to load wood into a predetermined drying chamber, supply heat from a heat source into the drying chamber, and set the ambient temperature to 50 ° C. to 100 ° C. for drying. Depending on the type of heat source, hot air type
-13505, etc.), electric heating type, steam type (JP-A-3-
799983). Then, the air in the drying chamber is forcedly circulated to improve the drying efficiency. By adopting such forced drying, it becomes possible to dry the wood in several days, which has taken several years in the natural drying.

By the way, a wood drying device for forcibly drying wood is usually provided with a heat-insulating drying chamber having a volume capable of accommodating a predetermined amount of wood and an atmosphere matching this drying chamber. Various devices, that is, a heater for heating the drying chamber, a steam generator (boiler) for humidifying the drying chamber, and a fan for stirring the atmosphere in the drying chamber are essential.

Regarding such a drying device, in addition to the above publications, JP-A-47-14302 and JP-A-48-8
5704, JP 49-41506 A, JP 50-18604 A, JP 50-44545 A, JP 53-20401 A, JP 53-1 A
39703, JP-A-55-884, JP-A-55-12325, JP-A-56-87783, JP-A-56-146975, and JP-A-57-9.
8777, JP-A-57-192782, JP-A-4-306480, and JP-A-4-306481.
And the like are disclosed.

[0006]

By the way, the drying devices described in the above publications are all large structures and have to be built up from the foundation work, so that there is a problem that the construction cost increases. There is. In addition, since power lines, water supply pipes, steam pipes, etc. are stretched between the drying room and auxiliary equipment such as switchboards and boilers, it is extremely difficult to move the drying device, which lacks versatility and mobility. There is a problem.

Therefore, the wood purchased at each site is
There is an inconvenience that it takes extra transportation cost and time because it is once transported to the place where the drying device is installed, dried there and then returned to the construction site.

Therefore, it is conceivable that the dryer is constructed as a prefabricated building and temporarily assembled and used at a construction site.
First of all, the assembly work itself is troublesome, and additional work such as power supply work for supplying electric power to the heater and piping work for supplying water to the boiler must be performed. If this is done, it is better and more practical to carry the wood to the place where there is a drying device and to carry out the drying treatment there.

The present invention has been made in order to solve the above-mentioned problems, can be manufactured at low cost, can be easily carried to a construction site or a manufacturing site, and can be used at various sites. It is an object of the present invention to provide a wood drying device capable of performing a drying process on wood that is in close contact with the above-mentioned site without requiring any construction.

[0010]

A wood drying apparatus according to claim 1 of the present invention has a heater for raising an atmospheric temperature, a boiler for generating steam for humidifying the atmosphere, and a fan for circulating atmospheric air. A wood drying apparatus having an atmosphere space for drying wood therein, wherein the atmosphere space is formed inside a transportable unit structure, and the heater, boiler, and fan operate by receiving power supply. Is used and is attached to the unit structure.

A wood drying apparatus according to claim 2 of the present invention comprises:
The wood drying apparatus according to claim 1, wherein the unit structure is formed of a rectangular parallelepiped box body having six surfaces surrounded by heat insulating walls, the heater is disposed inside the box body, and the boiler is the box body. Is attached to the outer wall surface of the fan, and the fan is installed inside the box so that the ventilation surface is orthogonal to the horizontal direction.
A steam introduction hole for introducing the steam generated from the boiler into the box body is provided on the outer wall of the box body, and the atmosphere space is the air blow surface of the fan in the box body and the inner wall surface of the box body facing the air blow surface. An exhaust fan is provided which is formed by a space between them and discharges atmospheric air in the atmosphere space.

A wood drying apparatus according to claim 3 of the present invention comprises:
The wood drying apparatus according to claim 1 or 2 is characterized in that the steam generated in the boiler is configured to be supplied to the inside of the box through a pressure pump.

A wood drying apparatus according to claim 4 of the present invention comprises:
The wood drying apparatus according to any one of claims 1 to 3, further comprising a control device that outputs a control signal for supplying electric power to the boiler only during a predetermined period of initial wood drying. Is.

[0014]

According to the wood drying apparatus of the first aspect, since the wood drying apparatus is constituted by the transportable unit structure, the unit structure is brought into close contact with the construction site by being carried to the construction site. Thus, it becomes possible to arrange a drying device. Further, since a heater, a boiler and a fan for forming an atmosphere for drying wood are attached to this unit structure, the heater, the fan and the boiler are immediately ready for operation by obtaining electric power from the construction power source. .

According to the wood drying device of the second aspect, the wood is loaded into the atmosphere space formed in the box body,
By blowing a predetermined amount of steam generated in the boiler through the steam introduction hole, the water content of the wood once increases, and
The water distribution in the wood becomes uniform. Thus, once the water distribution in the wood is made uniform, the generation of bending and cracking is effectively suppressed in the subsequent forced heating and drying. Moreover, the wood is preheated by the supply of steam.

After the water content in the wood becomes uniform, the heater provided in the box is heated to generate heat, whereby the atmosphere space is heated, the water content in the wood is evaporated, and the wood is removed. To be dried.

By operating the fan during the operation of blowing the steam into the atmosphere space and the operation of heating the space, the steam and hot air circulate in the atmosphere space, so that the humidity and temperature in the space are uniform. Therefore, the moisture absorption state of wood and the temperature rise state of wood do not differ depending on the part in the space, and it is possible to perform uniform moisture absorption and temperature rise treatment.

Further, by operating the pressure pump for discharging the atmospheric air in the atmosphere space, the steam filled in the atmosphere space can be forcibly discharged, and the ON / OFF control of the pressure pump controls the inside of the atmosphere space. It allows fine adjustment of humidity and temperature.

According to the wood drying device of the third aspect, the steam generated in the boiler is supplied to the inside of the box through the pressure pump. Therefore, the drive control of this pressure pump should be performed. With this, it is possible to adjust the amount of steam supplied to the box body without being affected by the amount of steam generated by the boiler, and it is possible to supply the required amount of steam accurately to the box body.

According to the wood drying apparatus of the present invention, electric power is supplied to the boiler only for a predetermined time in the initial period of wood drying by the signal from the controller, and the boiler is automatically put into operation and generated. Steam is supplied to the atmosphere space.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view showing an example of a wood drying apparatus according to the present invention. Further, FIG. 2 shows A- of FIG.
A sectional view taken along line A, FIG. 3 is a sectional view taken along line BB, and FIG. 4 is sectional view taken along line CC.
It is a line sectional view. As shown in these drawings, the wood drying apparatus 1 of the present invention has a basic structure composed of a transportable unit structure 2. This unit structure 2 is shown in FIG.
As shown in FIG. 6, six sides are formed by a rectangular parallelepiped box body surrounded by walls. A metal frame member 21 is laid in the ridgeline portion and other appropriate places of the unit structure 2, and the frame member 21 forms a rectangular skeleton.

A door frame 22 is provided on one side of the skeleton, and the door frame 22 forms an entrance / exit for lumber (wood) R with respect to the unit structure 2. In addition, the door frame 22 has a heat-insulating door 2
3 is attached to be openable and closable. The door 23 has a small hole 23a for ventilation. In addition, in the present embodiment, the door 23 is provided on one of the wall surfaces (short wall surfaces) having a shorter horizontal dimension out of the two pairs of wall surfaces facing each other surrounding the unit structure 2, but is limited to the short wall surface. However, it may be provided on the long wall surface.

An outer wall plate 24 and an inner wall plate 25 made of thin metal plates are attached to the skeleton so as to sandwich the frame member 21, and a heat insulating material 26 is provided between the outer wall plate 24 and the inner wall plate 25. It is filled. In the present embodiment, galvanized color steel plates are applied to the outer wall plate 24 and the inner wall plate 25, and 50 mm thick glass wool is used as the heat insulating material 26.

Inside such a unit structure 2,
A drying chamber 20 surrounded by the floor surface 2a, the inner wall surface 2b, and the ceiling surface 2c is formed, and a device arranging chamber 20a is provided above an upper edge portion of a door 23 of the drying chamber 20 and the device. A drying space (atmosphere space) 20b for drying the lumber R is provided below the placement chamber 20a. In the present embodiment, the outer dimensions of the unit structure 2 are set to 1.8 m in frontage (on the side where the door 23 is provided), 4.5 m in depth, and 1.8 m in height. Also,
The height of the drying space 20b is set to 1 m.

A partition plate 27 is hung from the ceiling surface 2c in the device placement chamber 20a. The partition plate 27 divides the device placement chamber 20a into two equal parts in the longitudinal direction, and a partition 200a is formed in each of them. And each branch 200
A shield plate 28 having a blower port 28a formed in the center is provided between the inner wall surfaces 2b of a, between one side edge of the shield plate 28 and the partition plate 27, and the other. A gap 28b is formed between each of the side edge portions and the inner wall surface 2b.

A support frame 31 is provided on one of the inner wall surfaces 2b facing each other in the compartment 200a so as to project toward the center.
A fan 3 having a blower surface facing the blower opening 28a of the shielding plate 28 is fixed to the tip of the fan 3.

By driving this fan 3, the air in the equipment arranging chamber 20a is blown from the air outlet 28a to the drying space 2
0b, the air is blown into the drying space 20b, and is returned to the equipment arranging chamber 20a through the gaps 28b formed on both sides of the rear shield plate 28 and circulates in the drying chamber 20. In this embodiment, the fan 3 is 0.75 kW
Two units are provided, and the two units are 60 to 180 m ³ / mi
It is possible to adjust the air flow rate within the range of n.

Then, the gap 2 on both sides of the shielding plate 28 is formed.
At the upper part of the portion 8b, two electric heaters 4 are provided for each branch chamber 200a, and a total of four electric heaters 4 are provided to heat the atmospheric air in the drying chamber 20 passing through the gap 28b. In the case of this embodiment, this electric heater 4 is 3
It has a capacity of kW and is used for about 4 units.
It has the ability to obtain the maximum calorific value of 0000 kcal / hr.

On the outer side of the unit structure 2, an electric heating type boiler 5 is attached to the unit structure 2. The steam generated from the boiler 5 is introduced into the pressure pump 52 provided at the center of the upper surface of the unit structure 2 through the steam pipe 51.
It is pressurized at 2 and supplied into each device placement chamber 20a through a pair of steam branch pipes 53.

Further, in this embodiment, the boiler 5 is provided with a safety valve (not shown), and the steam generation amount of the boiler 5 is larger than the steam amount supplied from the pressure pump 52 into the drying chamber 20. At this time, excess steam is released from the safety valve to the outside.

In the case of this embodiment, the boiler 5 has 3.4.
A heater with a capacity of KW is built in, and by heating water with this heater, steam with a maximum pressure of 3 kg / cm ² G can be generated at a rate of 5.1 kg / hr. . Tap water or well water is directly supplied to the boiler 5 through a predetermined hose or the like. A cartridge type water tank having a capacity of 5 to 10 liters may be provided. Also, a manual water softener is provided in the boiler 5,
Tap water is softened by performing a predetermined manual operation, and steam is produced from the softened water obtained.

An exhaust pipe (exhaust hole) 60 communicating with the inside of the drying chamber 20 is provided at one corner of the upper surface of the unit structure 2 so as to exhaust the atmospheric air inside the drying chamber 20. Inside the exhaust stack 60, a damper 62 that adjusts the opening degree of the exhaust stack 60 by rotating around the horizontal axis 61 is provided. Further, an actuator 63 for rotating the horizontal shaft 61 about its axis to change the opening of the damper 62 is provided on the upper surface of the unit structure 2. By operating this actuator 63, the damper 62 is operated. The opening degree of is adjusted.

An exhaust fan 6 is provided in the lower part of the exhaust tube 60, and the atmospheric air in the drying chamber 20 can be forcedly exhausted by operating the exhaust fan 6. . In this embodiment,
The exhaust fan 6 is provided with a motor capacity of 65 W and exhausts with a capacity of 18 m ³ / min.

A control device 7 is provided on the upper surface of the unit structure 2, and the control device 7 operates on the basis of a predetermined control program in which the temperature and humidity in the drying space 20b are stored in advance over time. Is automatically controlled.

The wood drying apparatus 1 having such a structure is provided with the lead wire 8 having the outlet 81 at the tip thereof. By connecting the outlet 81 to a predetermined power source provided at the construction site, It is possible to supply all the energy required for operating the wood drying device 1 without using such energy as gas and oil.

Since the wood drying apparatus of the present invention is constructed as described above, when drying the lumber R, first,
The door 23 of the unit structure 2 is opened to dry the space 20b.
The lumber R to be dried is placed inside. This charging is performed by stacking the lumber R on the floor surface 2a in the drying chamber 20, but preferably the outer peripheral surfaces of all the lumber R loaded are in contact with the atmospheric air in the drying space 20b. For the so-called cross-sectional shape, a so-called cross-section with a cross-section of a crosspiece intervening is applied.

When the filling of the lumber R into the drying space 20b is completed, the outlet 81 is connected to the nearest power source at the construction site so that the wood drying apparatus 1 can be supplied with power. Further, the nearest water tap and the boiler 5 are connected by a hose to supply water to the boiler 5. After that, the boiler 5 is operated by operating a switch (not shown), and at the same time, the fan 3 is rotationally driven.

Then, the steam generated by the operation of the boiler 5 is sent to the pressure pump 52 through the steam pipe 51, and the pressure thereof is boosted to pass through the steam branch pipe 53 to be injected and supplied into each of the compartments 200a of the equipment arranging chamber 20a. To be done. And
The steam supplied into the compartment 200a is blown into the lower drying space 20b by the fan 3 through the blower port 28a, permeates from the surface of the lumber R piled up to the inside, and the temperature is increased, and the moisture value is changed. To raise. In the present embodiment, the temperature of the lumber R is raised to 60 to 70 ° C., and the water content of the lumber R is made substantially uniform to about 100% by continuing the steam supply for 12 to 24 hours.

When the temperature of the lumber R reaches 60 to 70 ° C. and the water content reaches about 100%, the operation of the boiler 5 is stopped, the blowing of steam into the drying chamber 20 is stopped, and instead, The exhaust fan 6 is operated. As a result, the steam filled in the room is discharged to the outside through the exhaust pipe 60 and is replaced with the air introduced from the small hole 23a formed in the door 23.

The present invention is not limited to humidifying the lumber R to about 100% in the humidifying step, and may be 100% or more.
It may be less than 100%.

Next, after the steam in the drying chamber 20 is completely discharged, the electric heater 4 is energized, and the equipment placement chamber 2
The atmospheric air in 0a is heated. The heated atmospheric air is blown into the drying space 20b by the fan 3 through the blower port 28a, and the lumber R having a moisture content of about 100%, which is stacked in the drying space 20b, is dried. When the drying is completed, the energization of the electric heater 4 is stopped, the operation of the fan 3 is stopped, the door 23 is opened, and the lumber R that has become the desiccant is taken out from the drying chamber 20.

The damper 6 provided in the exhaust stack 60
2 is opened / closed appropriately according to the temperature and humidity in the drying chamber 20, and the opening degree is set so that the atmosphere in the drying chamber 20 is always optimum.

Before the drying with the heated air, the lumber R is forcibly humidified until the water content becomes substantially uniform to about 100%, so that the evaporation state of the water from the surface of the lumber R becomes uniform. Saw lumber R without bending or cracking due to uneven water content that occurs when raw wood is heated and dried.
Is dried.

In this embodiment, since the shield plate 28 is provided between the equipment arrangement chamber 20a and the drying space 20b, the shield plate 28 rectifies the atmosphere in the drying chamber 20 so that it can circulate well. As shown by an arrow in FIG. 2, the atmosphere on the fan 3 that serves as a plate is supplied into the drying space 20b through the blower port 28a and is formed in a gap formed outside both sides of the shielding plate 28. Equipment placement room 20 through 28b
It returns to a and circulates well.

The equipment placement chamber 20a has a partition plate 27.
Since the pair of compartments 200a is divided into two and the fan 3 is provided in each of the compartments 200a, it is possible to create a uniform atmosphere inside the compartment sufficiently corresponding to the depth of the drying compartment 20. is there.

FIG. 5 is a block diagram showing a control mechanism according to the present invention. As shown in this figure, in the present embodiment, the temperature and humidity in the drying chamber 20 are automatically controlled by the control device 7 attached to the unit structure 2. In order to perform automatic control, a temperature sensor 71 and a humidity sensor 72 are provided in the drying chamber 20, and the temperature and humidity in the drying chamber 20 detected by these sensors are always input to the control device 7. There is.

A predetermined control signal is output to the fan 3, the boiler 5, the pressure pump 52, the exhaust fan 6 and the actuator 63 based on the control program stored in the controller 7. They are designed to start and stop.

Specifically, a timer is built in the control device 7, and the basic time-dependent operation (schedule operation) of the wood drying apparatus 1 is performed based on this timer. This aging operation is basically based on a humidification step of supplying steam to humidify the lumber R, an exhaust step of exhausting the vapor in the drying chamber 20 after humidification, and a drying step of heating and drying the lumber R after exhaust. ing.

Then, when the operation system of the wood drying apparatus 1 is switched on, the timer is first started, the control signal for operating the boiler 5 is output, the boiler 5 is energized, and the fan 3 is turned on. A control signal for driving is output, and the fan 3 is energized. After a lapse of a predetermined time, a control signal for driving the pressure pump 52 is output, and the steam generated in the boiler 5 by the operation of the pressure pump 52 is supplied into the drying chamber 20 at a predetermined pressure (above humidification step).

When a preset predetermined time elapses, a signal for stopping the operation is output from the control device 7 to the boiler 5 and the pressure pump 52, and the power supply to the boiler 5 and the pressure pump 52 is cut off. At the same time, a control signal for fully opening the damper 62 and a signal for driving the exhaust fan 6 are output to the actuator 63. By driving the exhaust fan 6, the vapor in the drying chamber 20 is exhausted by the exhaust pipe 60.
It is discharged to the outside through (exhaust process).

After the evacuation process for a predetermined time, the driving of the exhaust fan 6 is stopped. At the same time, a control signal for operating the electric heater 4 is output from the control device 7, and the electric heater 4 is energized. As a result, the atmospheric air in the drying chamber 20 is heated by the heat generated by the electric heater 4, the heating air is circulated in the drying chamber 20 by the driving of the fan 3, and the lumber R loaded in the drying chamber 20 is forcibly dried by the heating air. To be done.
When a preset drying time has elapsed, the controller 7 outputs an energization stop signal to the electric heater 4 to complete the drying. (The above is the drying step).

In the present embodiment, the temperature in each of the above steps is preset and input to the control device 7, so that the set value and the detected value detected by the temperature sensor 71 are constantly compared and calculated. It has become. As a result of this comparison calculation, when the temperature is lower than the set value, the control device 7
Outputs a signal for increasing the power supply amount to the electric heater 4, and outputs a signal for decreasing the power supply amount when the temperature is higher than a set value.

Further, in the present embodiment, the humidity in each of the above steps is preset and input to the controller 7.
A comparison calculation between the set value and the detection value detected by the humidity sensor 72 is always performed. As a result of this comparison calculation, when the humidity is lower than the set value, the control device 7 outputs a signal for increasing the power supply amount to the boiler 5 and the pressure pump 52, and when the humidity is higher than the set value, the same power is supplied. A signal for reducing the supply amount or cutting off the power supply is output.

Therefore, the inherent temperature and humidity in the drying chamber 20 in each of the above steps are always properly controlled, and the lumber R loaded in the drying chamber 20 can be efficiently dried.
In the present embodiment, the operation of the boiler 5 is stopped after entering the drying process, and the active supply of steam into the drying chamber 20 is stopped. Therefore, after entering the drying step, the humidity sensor 72 is used to know the dry state of the lumber R, and it is determined that the drying is completed when the inside of the drying chamber 20 becomes below the preset humidity. .

In the above embodiment, the drying chamber 2
The humidity control within 0 can be omitted.
The reason is that by controlling the time of the humidification process, the exhaust process, and the drying process, it is possible to set the humidity condition in the drying chamber 20 within a predetermined range without performing strict humidity control. is there. That is, in the humidifying step, the drying chamber 20 is filled with saturated steam for a predetermined time, so that if the steam supply time from the boiler 5 is appropriately set, the water content of the lumber R is set to about 100%. In addition, if the evacuation process is sufficiently timed, the steam can be completely discharged from the drying chamber 20. Furthermore, in the drying process, it is possible to set an appropriate drying time in relation to the temperature. However, needless to say, if humidity control is performed in addition to temperature control in the drying chamber 20, more appropriate drying management can be performed.

FIG. 6 is a partially cutaway perspective view showing another example of the wood drying apparatus according to the present invention. In this example,
In the drying chamber 20 'of the wood drying apparatus 1', a pair of vertically extending shield plates 28 'with a blower opening 28a' provided at a substantially central portion are provided, and the drying chamber 20 'is provided by the shield plates 28'. ′ Is laterally divided into a device placement chamber 20a ′ and a drying space 20b ′ which is an atmosphere space for drying wood. Therefore, the air blowing surface of the fan 3'is perpendicular to the horizontal direction in the drying chamber 20 '.

A pair of fans 3'are provided in the equipment arranging chamber 20a 'so as to face the blower openings 28a' while being supported by a support frame 31 'standing on the floor surface 2a. By driving the fan 3 ', the air in the equipment placement chamber 20a' is blown out into the drying space 20b 'from the air outlet 28a.

In this embodiment, since the fans 3'are laid horizontally as described above, the partition plates 27 'are accordingly provided upright between the shield plates 28' and provided for each fan 3 '. A pair of electric heaters 4'are also installed upright on the floor 2a so as to sandwich the fan 3 '. Further, the pressure pump 52 is provided on the outer wall surface of the equipment arranging chamber 20a 'of the unit structure 2 so as to send steam into the equipment arranging chamber 20a' from the side. Other configurations are substantially the same as the wood drying device 1 of the previous example.

As in this embodiment, if the air is blown into the drying space 20b 'from the lateral direction by the fan 3', a plurality of sub-sheets are stacked vertically and loaded in the drying space 20b '. Air is blown from the lateral direction to the milled lumber and passes through the gaps above and below the lumber, and the drying chamber 20 '
It circulates evenly in the horizontal direction to achieve more even drying of lumber.

[0060]

As described above, the wood drying apparatus according to claim 1 of the present invention includes the electric heater for raising the atmospheric temperature, the boiler for generating the steam for humidifying the atmosphere, and the fan for circulating the atmospheric air. Is a wood drying apparatus having an atmosphere space for drying wood therein, the atmosphere space being formed inside a transportable unit structure.

Therefore, by carrying the above unit structure to the construction site, it becomes possible to dispose the drying device in close contact with the site. And since this unit structure is provided with an electric heater, a boiler and a fan for forming an atmosphere for drying wood, while obtaining electric power from a construction power supply provided at the construction site,
By supplying water to the boiler, it is convenient to be able to immediately operate the electric heater, fan and boiler without any special work for the wood drying device.

Further, the wood drying apparatus according to claim 1 of the present invention can be made smaller than the conventional drying apparatus constructed as a full-scale building on the foundation, and the manufacturing cost can be reduced. It can be kept at a low price and is extremely economical.

Further, by using the wood drying apparatus according to the first aspect of the present invention, the wood is carried into a drying apparatus installed at a place different from the construction site and subjected to a drying treatment as in the conventional case. It is not necessary to carry out the piston transportation of the timber, which is a trouble of sending the desiccant material to the construction site again, and as a result, the transportation cost is reduced and the timber can be dried at the construction site with a small turning time whenever necessary. It will be possible.

According to the wood drying apparatus of the second aspect of the present invention, once the water distribution in the wood is made uniform, it is possible to effectively suppress the occurrence of cracks and distortions in the subsequent forced heating drying. It will be possible. In addition, the temperature of the wood can be raised in advance by supplying steam, and energy can be saved in the subsequent drying.

According to the wood drying apparatus of the third aspect of the present invention, by controlling the drive of the pressure pump, the amount of steam supplied into the box can be adjusted without being affected by the amount of steam generated by the boiler. It is possible to supply the required amount of steam into the box with high accuracy, which is convenient.

According to the wood drying apparatus of the fourth aspect of the present invention, the control signal output from the control apparatus is used to automatically perform the switch operation via the human hand only for a predetermined time in the initial period of wood drying. Since the boiler operates and steam is supplied from the boiler into the atmosphere space, it is effective in saving labor in the drying operation.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a wood drying apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a block diagram illustrating a control mechanism according to the present invention.

FIG. 6 is a partially cutaway perspective view showing another example of the wood drying apparatus according to the present invention.

[Explanation of symbols]

 1,1 'Wood drying device 2,2' Unit structure 2a Floor surface 2b Inner wall surface 2c Ceiling surface 20,20 'Drying room 20a, 20a' Equipment placement room 200a Branch room 20b, 20b 'Dry space 200a Branch room 21 Frame material 22 Door frame 23 Door 23a Small hole 24 Outer wall plate 25 Inner wall plate 26 Insulation material 27, 27 'Partition plate 28, 28' Shield plate 28a, 28a 'Blower port 28b Gap 3,3' Fan 31, 31 'Support frame 4 Electric heater 5 Boiler 51 Steam Pipe 52 Pressure Pump 53 Steam Branch 6 Exhaust Fan 60 Exhaust Cylinder 61 Horizontal Axis 62 Damper 63 Actuator 7 Controller 71 Temperature Sensor 72 Humidity Sensor

Claims (4)

[Claims] 1. A wood drying apparatus having an atmosphere space for drying wood, which has a heater for raising an atmosphere temperature, a boiler for generating steam for humidifying the atmosphere, and a fan for circulating the atmosphere air. The atmosphere space is formed inside a transportable unit structure, and the heater,
A wood drying apparatus characterized in that a boiler and a fan that operate by receiving power supply are used and are attached to the unit structure. 2. The unit structure is formed of a rectangular parallelepiped box body having six surfaces surrounded by heat insulating walls, the heater is disposed inside the box body, and the boiler is attached to an outer wall surface of the box body. The fan is attached such that the air blowing surface is orthogonal to the horizontal direction inside the box, and a steam introduction hole for introducing the steam generated from the boiler into the box is provided on the outer wall of the box. The atmosphere space is formed by a space between the air blowing surface of the fan in the box body and the inner wall surface of the box body facing the air blowing surface, and an exhaust fan for discharging the atmosphere air in the atmosphere space is provided. The wood drying apparatus according to claim 1, which is characterized in that. 3. The wood drying apparatus according to claim 1, wherein the steam generated in the boiler is configured to be supplied into the box body via a pressure pump. 4. The wood according to claim 1, further comprising a control device for outputting a control signal for supplying electric power to the boiler only during a predetermined period of an initial period of wood drying. Drying device.