A rapid drying apparatus for wood processing

Abstract

This invention relates to the field of wood processing technology, specifically to a rapid drying device for wood processing, comprising a drying chamber. Support mechanisms are provided on both sides of the bottom of the drying chamber, and each support mechanism includes a support base. The support base is fixed to both sides of the bottom of the drying chamber. A rotating self-falling mechanism is provided at the top of the support base, and the rotating self-falling mechanism includes a rotating ring rotatably connected to the top of the support base. This invention uses a motor to drive a gear and a gear ring to rotate the drying cylinder and the rotating rings at both ends, causing multiple sets of circular seats inside the cylinder to rotate synchronously. Utilizing the structural characteristic that the wood size is smaller than the inner diameter of the circular seats, the wood is lifted as the circular seats rotate and continuously tumbles and flips under its own weight. This operation allows each surface of the wood to alternately contact the hot air inside the drying chamber, changing the traditional fixed and static drying mode of wood, and effectively solving the problems of uneven drying and external dryness with internal dampness.

Description

Technical Field

[0001] This invention relates to the field of wood processing technology, specifically to a rapid drying device for wood processing. Background Technology

[0002] In the timber processing industry, logs, timber sections, and various semi-finished timber products retain a large amount of free and adsorbed water in their internal fiber gaps and cell structures during natural harvesting and storage. If the timber is not effectively dried and dehumidified, the high moisture content makes it highly susceptible to environmental temperature and humidity changes during subsequent cutting, sanding, splicing, painting, and long-term storage and use. This can lead to problems such as shrinkage and swelling, warping, cracking, mold, and insect infestation, severely reducing the structural stability and appearance quality of finished timber products and significantly shortening their lifespan. Therefore, the timber drying process is an indispensable core step in timber finishing. The drying method, uniformity, and efficiency of the drying equipment directly determine the pass rate and production capacity of the finished timber products. Currently, the industry commonly uses hot air drying to treat timber. Through heat exchange between high-temperature hot air and the surface of the timber, the internal moisture of the timber gradually separates and is discharged with the airflow, thus achieving the drying of the timber.

[0003] For example, patent document CN102192641A discloses a wood drying kiln. This kiln includes a rectangular kiln body with a vertical partition wall on the stove side, dividing the kiln body into an air guide chamber and a wood storage chamber. Heat dissipation pipes in the air guide chamber are arranged in an N-shape parallel to the partition wall. The first end of each heat dissipation pipe connects to the stove, and the second end connects to the kiln's exhaust port. Multiple reversible axial flow fans are vertically installed along one side of the heat dissipation pipes along the partition wall. This wood drying kiln, by arranging the heat dissipation pipes in an N-shape, allows the heat dissipation pipes to fully release heat within the kiln body, greatly improving the kiln's thermal efficiency. Furthermore, by setting up a partition wall within the kiln body and installing multiple reversible axial flow fans on the side of the heat dissipation pipes, the hot airflow within the kiln body can circulate horizontally and reversibly, resulting in more uniform heating and drying of the wood.

[0004] The above-mentioned technical solution has the following shortcomings: This patent belongs to the traditional static stacking drying kiln, in which wood is stacked on the support frame inside the kiln and kept stationary. Drying is achieved by relying on the hot air circulation driven by the fan inside the kiln. The wood is statically stacked, and the contact points between the wood and the support frame and the overlapping and touching points of the wood are blocked, making it difficult for hot air to reach them. The wood is fixed throughout the process and cannot be automatically turned over. The supported or stacked and blocked areas lack hot air washing for a long time, and the drying of the blocked areas is delayed. The moisture content of different areas of the wood varies greatly, which easily leads to problems such as dry outside and wet inside, and uneven drying. At the same time, hot air dead zones are easily formed between stacked wood, and the overall drying cycle is long. Therefore, it is urgent to design a rapid drying equipment for wood processing to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a rapid drying device for wood processing, in order to solve the technical problems mentioned in the background art: in the existing static stacking drying, the wood is stacked and forms a hot air dead zone, and in the clamping drying, the wood is limited by the clamp and cannot be turned over on its own, resulting in uneven local heating of the wood and easy occurrence of dry outside and wet inside.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rapid drying device for wood processing, comprising a drying chamber, wherein support mechanisms are provided on both sides of the bottom end of the drying chamber, and the support mechanisms include support seats, the support seats being fixed on both sides of the bottom end of the drying chamber; a rotating self-falling mechanism is provided at the top of the support seats, the rotating self-falling mechanism including rotating rings, the rotating rings being rotatably connected to the top of the support seats; connecting rods are evenly fixed on the inner sides of two sets of rotating rings, and a drying cylinder is fixed between the connecting rods; a toothed ring is fixed on the outer side of the drying cylinder; the rotating rings and the drying cylinder... The drying chamber has connecting frames evenly fixed inside, and circular seats are fixed between the connecting frames. The wood to be dried can be placed in the inner cavity of the circular seats. The outer diameter of the wood is smaller than the inner diameter of the circular seats. A fixed base is fixed to the top of the drying chamber, and a rotating shaft is rotatably connected inside the fixed base. A gear is fixed to the outside of the rotating shaft, and the gear and the gear ring are meshed. A motor is fixed to one side of the top of the drying chamber, and the output shaft of the motor is connected to the rotating shaft. A fixed frame is fixed to the top of the drying chamber on one side of the fixed base. One end of the motor extends into the interior of the fixed frame and is equipped with a reciprocating swing mechanism.

[0007] As a further improvement of this solution, the reciprocating swing mechanism includes a base, which is fixed at the bottom of the fixed frame. One end of the base is rotatably connected to a turntable, and one end of the rotating shaft is connected to the turntable. One end of the turntable is fixed with a rotating column, and the outer side of the rotating column is connected to a reciprocating frame. The rotating column is movably connected inside the reciprocating frame. Connecting plates are fixed on both sides of the reciprocating frame, and reciprocating plates are fixed on the outer side of the connecting plates. Reciprocating rods are fixed at the bottom of the connecting plates and the reciprocating plates. The bottom ends of the two sets of reciprocating rods extend into the interior of the drying oven and are fixed with heating plates. Air supply holes are evenly arranged on the inner side of the heating plates.

[0008] As a further step of this solution, sliders are uniformly fixed on the outer side of the heating plate, and slide rails are fixed at both ends of both sides inside the drying box, with slide grooves provided inside the slide rails, and the sliders and slide grooves are connected.

[0009] As a further improvement to this solution, the width of the slider is matched with the width of the groove, and the cross-sections of both the slider and the groove are T-shaped.

[0010] As a further improvement to this solution, the bottom ends of the reciprocating plate and the connecting plate on the outer side of the reciprocating rod are both fixed with sealing folding covers, and the bottom ends of the sealing folding covers are fixedly connected to the top of the drying oven.

[0011] As a further improvement to this solution, a flexible hose is connected to the outside of the heating plate, and the other side of the flexible hose is fixedly connected to the inner wall of the drying box. An air guide pipe is fixed to the outside of the drying box, and the air guide pipe and the flexible hose are connected internally.

[0012] As a further improvement of this solution, an annular rotating block is fixed to the outer side of the rotating ring, and a rotating groove is provided at the top of the support base, and the rotating groove is connected to the annular rotating block.

[0013] As a further step of this solution, the support base below the rotating groove is uniformly provided with grooves inside, and each groove is provided with a ball bearing.

[0014] As a further improvement of this solution, the width of the annular rotating block is matched with the width of the rotating groove, and the cross-sections of both the annular rotating block and the rotating groove are convex.

[0015] As a further improvement to this solution, the drying oven is provided with a door on the outside, and a handle is fixed to the outside of the door.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This rapid drying equipment for wood processing uses a motor-driven gear and gear ring to rotate the drying cylinder and the rotating rings at both ends. This causes multiple sets of circular seats inside the cylinder to revolve synchronously. Utilizing the structural characteristic that the size of the wood is smaller than the inner diameter of the circular seats, the wood is lifted as the circular seats rotate and then continuously tumbles and flips under its own weight. This operation allows each surface of the wood to alternately contact the hot air inside the drying chamber, changing the traditional fixed and static drying mode of wood. It effectively solves the problems of uneven drying and the problem of dry exterior and wet interior. At the same time, the independent circular seats limit and constrain individual pieces of wood, preventing multiple pieces of wood from colliding with each other during the drying process, reducing wood processing losses. While ensuring the integrity rate of the wood, it increases the contact area between the wood and the hot air, effectively improving the uniformity of wood drying and the overall drying efficiency. The shared drying drum's drive motor synchronously drives the turntable and rotating column via the rotating shaft, converting circular motion into linear reciprocating motion. This causes the heating plate to swing up and down along the slide rail. Hot air is dynamically ejected from the air outlets of the heating plate through the air duct and hose. This linkage operation requires no additional drive equipment and can achieve simultaneous wood tumbling and drying with dynamic air supply. It continuously changes the angle and direction of hot air jets inside the chamber, breaking up static hot zones and eliminating drying dead corners. Combined with the telescopic sealing operation of the sealing folding cover, it maintains the airtightness of the drying chamber cavity, reduces heat loss, and allows the flowing hot air to continuously wash the surface of the tumbling wood, accelerating the evaporation of moisture from the wood surface, further improving drying uniformity and heat utilization, resulting in energy saving and high efficiency. By setting a convex annular rotating block that cooperates with a rotating groove with balls, the sliding friction during the rotation of the drying cylinder is converted into rolling friction, reducing the operating load of the equipment and reducing the wear of parts. At the same time, the convex structure interlocks and limits each other, which can prevent the drying cylinder from axially shifting and ensuring that the drying cylinder rotates smoothly. This makes the rolling action of the wood in the annular seat stable, ensuring continuous and reliable operation of the drying operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional schematic diagram of the fixed frame of the present invention; Figure 3 This is a frontal cross-sectional view of the present invention; Figure 4 This is a side cross-sectional view of the present invention; Figure 5 This is a side cross-sectional view of the heating plate of the present invention; Figure 6 This is a side view of the support mechanism of the present invention; Figure 7 This is a three-dimensional schematic diagram of the heating plate of the present invention; Figure 8 This is a three-dimensional schematic diagram of the drying drum in rotation state according to the present invention.

[0018] In the diagram: 1. Drying oven; 2. Reciprocating oscillating mechanism; 201. Reciprocating plate; 202. Connecting plate; 203. Turntable; 204. Reciprocating frame; 205. Rotating column; 206. Base; 207. Sealing folding cover; 208. Reciprocating rod; 209. Heating plate; 210. Air outlet; 3. Rotating self-falling mechanism; 301. Gear ring; 302. Fixed seat; 303. Gear; 304. Rotating shaft; 305. Drying cylinder; 306. Connecting frame; 307. Circular seat; 308. Rotating ring; 309. Connecting rod; 310. Motor; 4. Fixed frame; 5. Slide rail; 6. Support mechanism; 601. Support seat; 602. Circular rotating block; 603. Rotating groove; 604. Groove; 605. Ball bearing; 7. Hose; 8. Air guide pipe; 9. Slider; 10. Slide groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-8 The present invention provides the following technical solution: Example 1: To solve the problem of uneven wood drying in the prior art, the following solution is disclosed, specifically as follows: Figures 1-8As shown, the rapid drying equipment for wood processing provided in this application includes a drying chamber 1. Support mechanisms 6 are provided on both sides of the bottom end of the drying chamber 1. Each support mechanism 6 includes a support base 601, which is fixed to both sides of the bottom end of the drying chamber 1. A rotating self-falling mechanism 3 is provided at the top of the support base 601. The rotating self-falling mechanism 3 includes a rotating ring 308, which is rotatably connected to the top of the support base 601. Connecting rods 309 are evenly fixed to the inner sides of the two sets of rotating rings 308, and a drying cylinder 305 is fixed between the connecting rods 309. A toothed ring 301 is fixed to the outer side of the drying cylinder 305. The rotating rings 308 and the interior of the drying cylinder 305 are evenly fixed... There is a connecting frame 306, and a ring seat 307 is fixed between the connecting frames 306. The wood to be dried can be placed in the inner cavity of the ring seat 307. The outer diameter of the wood is smaller than the inner diameter of the ring seat 307. A fixed seat 302 is fixed at the top of the drying box 1, and a rotating shaft 304 is rotatably connected inside the fixed seat 302. A gear 303 is fixed on the outside of the rotating shaft 304, and the gear 303 and the gear ring 301 are meshed. A motor 310 is fixed on one side of the top of the drying box 1, and the output shaft of the motor 310 is connected to the rotating shaft 304. A fixed frame 4 is fixed on the top of the drying box 1 on one side of the fixed seat 302. A box door is provided on the outside of the drying box 1, and a handle is fixed on the outside of the box door.

[0021] In this embodiment, during operation, the motor 310 drives the rotating shaft 304 and gear 303 to rotate. The gear 303 meshes with and drives the gear ring 301, causing the drying cylinder 305, along with the rotating rings 308 at both ends, to continuously rotate on the support mechanism 6. Multiple sets of annular seats 307 are fixed on the connecting frame 306 inside the drying cylinder 305. The wood to be dried is placed inside the annular seats 307, with the wood size smaller than the inner diameter of the annular seats 307. During the rotation of the drying cylinder 305, the annular seats 307 revolve with the cylinder. When the annular seats 307 rotate from a low position to a high position, the wood rises upward along the inner wall of the annular seats 307 due to its own weight. When the annular seats 307 pass the highest point, the wood loses support and tumbles and falls downward within the inner cavity of the annular seats 307. As the wood continues to rotate and change direction, hot air is introduced into the drying chamber 1. The hot air penetrates the gaps in the annular seat 307 and wraps around the surface of the wood. The wood is constantly turned over, and each surface alternately comes into contact with the high-temperature airflow, achieving uniform drying. The drying cylinder 305 drives the annular seat 307 to rotate, causing the wood to continuously roll and turn over inside the annular seat 307 by its own weight. The annular seat 307 individually limits each piece of wood, preventing multiple pieces of wood from colliding and bumping with each other inside the drying chamber 1, reducing damage to the wood during processing. The wood continuously changes the heated surface, avoiding the defects of uneven heating and dry outside and wet inside when the wood is placed in a fixed position for drying in traditional drying methods. This improves the uniformity of wood drying and speeds up the drying rate. At the same time, external hot air is introduced into the cavity of the drying chamber 1 through the external air guide pipe 8, providing a high-temperature airflow for the drying operation.

[0022] Example 2: Based on Example 1, this example adds a reciprocating oscillating mechanism 2 to the same rotating motor 310, thereby linking the rotation of the drying drum 305 with the reciprocating airflow of the heating plate 209. Specifically, as shown... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, a reciprocating swing mechanism 2 is provided inside the fixed frame 4 at one end of the motor 310. The reciprocating swing mechanism 2 includes a base 206, which is fixed to the bottom of the fixed frame 4. A turntable 203 is rotatably connected to one end of the base 206. One end of the rotating shaft 304 is connected to the turntable 203. A rotating column 205 is fixed to one end of the turntable 203. A reciprocating frame 204 is connected to the outer side of the rotating column 205, and the rotating column 205 is movably connected inside the reciprocating frame 204. Connecting plates 202 are fixed to both sides of the reciprocating frame 204, and reciprocating plates 201 are fixed to the outer side of the connecting plates 202. Reciprocating rods 208 are fixed to the bottom ends of the connecting plates 202 and the reciprocating plates 201. The bottom ends of the two sets of reciprocating rods 208 extend into the drying chamber 1 and are fixed with heating plates. 209. Air supply holes 210 are evenly arranged on the inner side of the heating plate 209. Slider 9 is evenly fixed on the outer side of the heating plate 209. Slide rails 5 are fixed at both ends of both sides inside the drying box 1. Slide rails 5 are provided inside the slide rails 5. Slide rails 9 and slide rails 10 are connected. The width of slider 9 matches the width of slide rail 10. The cross-section of slider 9 and slide rail 10 is T-shaped. Sealing folding covers 207 are fixed at the bottom of reciprocating plate 201 and connecting plate 202 outside the reciprocating rod 208. The bottom of sealing folding covers 207 is fixedly connected to the top of the drying box 1. A hose 7 is connected to the outer side of the heating plate 209. The other side of the hose 7 is fixedly connected to the inner wall of the drying box 1. An air guide pipe 8 is fixed to the outer side of the drying box 1. The air guide pipe 8 and the hose 7 are connected internally.

[0023] In this embodiment, during use, one end of the output shaft 304 of the motor 310 drives the gear 303 to rotate the drying cylinder 305, and the other end of the shaft 304 synchronously drives the turntable 203 to rotate. The rotating column 205 on the turntable 203 moves in a circular motion with the turntable 203. The rotating column 205 is embedded inside the reciprocating frame 204, converting the circular motion of the turntable 203 into the up-and-down reciprocating linear motion of the reciprocating frame 204. The reciprocating frame 204 drives the reciprocating rod 208 and the heating plate 209 to slide up and down along the slide rail 5 through the connecting plate 202. External hot air is guided by the guide... The air duct 8 and the hose 7 are fed into the heating plate 209 and sprayed out from the air outlet 210. The heating plate 209 moves up and down and constantly changes the direction of the hot air jet, disturbing the air inside the drying chamber 1. The hot air continuously washes the surface of the wood in the tumbling state. The sealing folding cover 207 extends and retracts with the reciprocating rod 208 to keep the cavity of the drying chamber 1 sealed and prevent heat from escaping. The whole mechanism is driven by a single motor 310. The rotation of the drying cylinder 305 is synchronized with the reciprocating air supply of the heating plate 209, so that the wood tumbles in the ring seat 307 while the hot air is dynamically disturbed.

[0024] Example 3: Based on Example 1, this example optimizes the rotational support structure of the rotating rings 308 at both ends of the drying cylinder 305 to reduce the frictional resistance during the rotation of the drying cylinder 305. Specifically, as follows... Figure 3 and Figure 6 As shown, an annular rotating block 602 is fixed on the outer side of the rotating ring 308. A rotating groove 603 is provided at the top of the support base 601, and the rotating groove 603 is connected to the annular rotating block 602. Grooves 604 are evenly provided inside the support base 601 below the rotating groove 603, and balls 605 are provided inside each groove 604. The width of the annular rotating block 602 matches the width of the rotating groove 603. The cross-sections of the annular rotating block 602 and the rotating groove 603 are both convex.

[0025] In this embodiment, during use, annular rotating blocks 602 are fixed to the outer sides of the rotating rings 308 at both ends of the drying cylinder 305. The annular rotating blocks 602 are embedded in the rotating grooves 603 at the top of the support base 601. Ball bearings 605 are assembled in the grooves 604 at the bottom of the rotating grooves 603. The annular rotating blocks 602 and the rotating grooves 603 have convex cross-sections. When the drying cylinder 305 is driven to rotate by the gear ring 301 of the gear 303, the annular rotating blocks 602 rotate in the rotating grooves 603, and the ball bearings 605 roll and support the bottom of the annular rotating blocks 602, converting the sliding friction between the rotating rings 308 and the support base 601 into rolling friction. The convex annular rotating blocks 602 and the rotating grooves 603 are mutually engaged and limited to prevent axial movement or displacement during rotation, ensuring the stability of the rotation center and the smooth and reliable rolling of the wood in the annular seat 307.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rapid drying device for wood processing, comprising a drying chamber (1), characterized in that: Support mechanisms (6) are provided on both sides of the bottom of the drying box (1), and the support mechanism (6) includes a support base (601). The support base (601) is fixed on both sides of the bottom of the drying box (1). A rotating self-falling mechanism (3) is provided at the top of the support base (601). The rotating self-falling mechanism (3) includes a rotating ring (308), and the rotating ring (308) is rotatably connected to the top of the support base (601). Connecting rods (309) are evenly fixed on the inner sides of the two sets of rotating rings (308), and a drying cylinder (305) is fixed between the connecting rods (309). A toothed ring (301) is fixed on the outer side of the drying cylinder (305). Connecting frames (306) are evenly fixed inside the rotating rings (308) and the drying cylinder (305), and the connecting frames (306) are... A ring seat (307) is fixed in each of the drying boxes (1). The wood to be dried can be placed in the inner cavity of the ring seat (307). The outer diameter of the wood is smaller than the inner diameter of the ring seat (307). A fixed seat (302) is fixed at the top of the drying box (1). A rotating shaft (304) is rotatably connected inside the fixed seat (302). A gear (303) is fixed on the outside of the rotating shaft (304). The gear (303) and the gear ring (301) are meshed. A motor (310) is fixed on one side of the top of the drying box (1). The output shaft of the motor (310) is connected to the rotating shaft (304). A fixed frame (4) is fixed at the top of the drying box (1) on one side of the fixed seat (302). A reciprocating swing mechanism (2) is provided inside the fixed frame (4) at one end of the motor (310).

2. The rapid drying equipment for wood processing according to claim 1, characterized in that: The reciprocating swing mechanism (2) includes a base (206), which is fixed at the bottom of the fixed frame (4). One end of the base (206) is rotatably connected to a turntable (203). One end of the rotating shaft (304) is connected to the turntable (203). One end of the turntable (203) is fixed to a rotating column (205), and the outside of the rotating column (205) is connected to the reciprocating frame (204). The rotating column (205) is movably connected to the reciprocating frame (204). Inside the 04), both sides of the reciprocating frame (204) are fixed with connecting plates (202), and the outer sides of the connecting plates (202) are fixed with reciprocating plates (201). The bottom ends of the connecting plates (202) and the reciprocating plates (201) are fixed with reciprocating rods (208). The bottom ends of the two sets of reciprocating rods (208) extend into the interior of the drying box (1) and are fixed with heating plates (209). The inner side of the heating plates (209) is evenly provided with air holes (210).

3. A rapid drying device for wood processing according to claim 2, characterized in that: The outer side of the heating plate (209) is uniformly fixed with sliders (9), and both ends of the two sides inside the drying box (1) are fixed with slide rails (5), and the slide rails (5) are provided with slide grooves (10) inside. The sliders (9) and slide grooves (10) are connected.

4. A rapid drying device for wood processing according to claim 3, characterized in that: The width of the slider (9) matches the width of the groove (10), and the cross-sections of both the slider (9) and the groove (10) are T-shaped.

5. A rapid drying device for wood processing according to claim 2, characterized in that: The bottom ends of the reciprocating plate (201) and the connecting plate (202) on the outside of the reciprocating rod (208) are both fixed with sealing folding covers (207), and the bottom ends of the sealing folding covers (207) are fixedly connected to the top end of the drying oven (1).

6. A rapid drying device for wood processing according to claim 2, characterized in that: The outer side of the heat-discharging plate (209) is connected to a flexible hose (7), and the other side of the flexible hose (7) is fixedly connected to the inner wall of the drying box (1). The outer side of the drying box (1) is fixed with an air guide pipe (8), and the air guide pipe (8) and the flexible hose (7) are connected internally.

7. A rapid drying device for wood processing according to claim 1, characterized in that: An annular rotating block (602) is fixed to the outside of the rotating ring (308), and a rotating groove (603) is provided at the top of the support base (601), and the rotating groove (603) and the annular rotating block (602) are connected.

8. A rapid drying device for wood processing according to claim 7, characterized in that: The support base (601) below the rotating groove (603) is uniformly provided with grooves (604), and each groove (604) is provided with a ball (605).

9. A rapid drying device for wood processing according to claim 7, characterized in that: The width of the annular rotating block (602) matches the width of the rotating groove (603), and both the annular rotating block (602) and the rotating groove (603) have convex cross-sections.

10. A rapid drying device for wood processing according to claim 1, characterized in that: The drying oven (1) is provided with a door on the outside, and a handle is fixed on the outside of the door.

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