A nut drying device for production of pistachio products

Abstract

This invention relates to the field of nut processing equipment technology, specifically a nut drying device for almond product production, comprising: a drying box, a filling device, a sealing mechanism, a fruit-blocking baffle, an opening spring block, a gap-blocking plate, a limiting block, a fruit-storing plate, a smoothing block, and an anti-drop plate; the smoothing block rolls into the drying box via its inclined surface, ensuring that the drying box is fully loaded with almonds before leaving the filling device, and that the almonds are evenly spread out within the drying box. This ensures that the drying box maintains its balance while drying almonds in the drying chamber after leaving the filling device, and that the almonds are dried evenly within the drying box. This prevents the drying process from being affected by uneven stacking, thus improving the quality stability of the almond products.

Description

Technical Field

[0001] This invention relates to the field of nut processing equipment technology, specifically a nut drying device for almond product production. Background Technology

[0002] After almonds mature and are harvested, the first step is routine cleaning and stone removal. Then comes a crucial processing step: drying. Drying removes excess moisture, enhancing the aroma and flavor of the almonds. While traditional sun-drying is still used in some situations, its time-consuming nature and difficulty in controlling temperature and humidity have led many almond processors to opt for more advanced equipment like heat pump dryers. This aims to improve production efficiency, maintain consistent product quality, and ensure the sustainable development of the almond industry.

[0003] When drying almonds using equipment such as heat pump dryers, the pre-treated almonds are typically placed in batches on racks in the drying chamber before the dryer is turned on. Once the humidity level of the almonds in the drying chamber reaches the desired standard, the dryer is turned off, and the almonds are removed for further processing, such as seasoning, depending on the final product to be made. Before placing the almonds on the racks, workers must first spread them evenly to ensure the hot air from the dryer dries them evenly. However, because a large quantity of almonds needs to be processed at once, it is often difficult to ensure a uniform distribution on each rack. Consequently, even if the almonds in the middle layer of the racks have not yet reached the required dryness level, they are removed from the drying equipment once the humidity in the drying chamber has reached the preset standard. This portion of almonds is mixed in with the dried almonds and enters the next process together, which will inevitably affect the quality of the final almond product and is detrimental to the business development of almond production enterprises.

[0004] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a nut drying device for almond product production. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the technical solution adopted by this invention to solve its technical problem is: a nut drying device for almond product production, comprising: A stepper motor, which is fixedly connected to a mounting bracket inside the drying chamber; A circulating belt, which is driven by a stepper motor to perform directional periodic circulation; Also includes: The drying chambers, which are arranged at equal intervals, are hinged to the circulating belt via connecting shafts in the middle of the two side walls; ventilation holes are provided at the bottom and all four side walls of the drying chambers. A filling device is installed on the top of the drying chamber and is used to fill the harvested almonds evenly and in appropriate amounts into the drying chamber.

[0006] Preferably, the drying chamber is made of side walls made of lightweight heat-resistant plastic and a metal base plate made of heavy metal material, and the mass of almonds fully loaded in a single drying chamber is less than the mass of the metal base plate.

[0007] Preferably, the filling equipment includes: The filling port is fixedly connected to the top of the filling equipment, and the filling port is a frustum-shaped structure with an opening cross-section that gradually increases from bottom to top; A sealing mechanism is installed at the lower end of the filling port and located inside the filling equipment; the sealing mechanism is used to release an appropriate amount of almonds into the drying chamber. A fruit-blocking baffle is hinged to the side wall of the filling equipment near the drying chamber. The inlet is located at the lower end of the fruit-blocking baffle, and the width of the inlet is the same as the width of the drying box. The first opening spring is slidably connected to the inner wall of the filling equipment along the length of the drying chamber, and the first opening spring is used to control the opening and closing of the sealing mechanism.

[0008] Preferably, the sealing mechanism includes: A left sealing plate, which is fixedly connected to the inner wall of the filling equipment; The right sealing plate extends into the inner wall of the filling equipment at one end away from the left sealing plate. The portion of the right sealing plate extending into the inner wall of the filling equipment is fixedly connected to an electric push rod installed inside the filling equipment. The right sealing plate slides up and down along the inner wall of the filling equipment under the action of the electric push rod. When the side wall of the right sealing plate rises to the highest position, it fits tightly against the side wall of the left sealing plate.

[0009] Preferably, the portions of the left and right sealing plates that extend into the inner cavity of the filling equipment are both downwardly inclined straight plates, and the two side walls where the left and right sealing plates fit together are both inclined slopes.

[0010] Preferably, a baffle plate is fixedly connected above the end of the right sealing plate near the inner wall of the filling equipment, and the height of the baffle plate is greater than the maximum stroke of the right sealing plate sliding up and down.

[0011] Preferably, a limiting block is elastically connected to the upper end of the two long side walls of the drying oven near the fruit-blocking baffle. The end of the limiting block near the fruit-blocking baffle is an inclined surface, and the inclination angle of the inclined surface of the limiting block is no greater than 30°.

[0012] Preferably, a fruit storage plate is slidably connected to the end of the filling equipment away from the inlet along the inner wall of the filling equipment. A smoothing groove is also provided on the side wall of the fruit storage plate away from the inlet. A smoothing block driven by a cylinder is slidably connected in the smoothing groove. The front end of the smoothing block is designed with a slope, and the slope of the front end of the smoothing block contacts and cooperates with the inclined side wall at the lower end of the fruit storage plate.

[0013] Preferably, an opening spring block 2 is installed at the top of the slide groove where the fruit storage plate is located, the height of the smoothing block is greater than the height of the drying box, and the two end side walls of the smoothing block are fixedly connected with anti-drop plates that are longer than the smoothing block and extend forward.

[0014] Preferably, the lower end of the forward-extending portion of the anti-fall plate is chamfered at a large angle, and the thickness of the anti-fall plate is the same as the thickness of the side wall of the drying oven.

[0015] The beneficial effects of this invention are as follows: 1. The sidewall portion where the left and right sealing plates meet is an inclined slope. This ensures that a gap immediately forms between the left and right sealing plates once the right sealing plate moves, allowing the almonds above the sealing mechanism to be released quickly into the drying chamber below, improving the efficiency of almond loading in the drying chamber. When the drying chamber no longer pushes against it, the fruit-blocking baffle immediately returns to a vertically downward position under the action of the torsion spring at the hinge, sealing off the relevant area of ​​the filling equipment above the drying chamber. This prevents the almonds from being ejected from the drying chamber due to contact or collision when the sealing mechanism opens and the almonds fall into the drying chamber.

[0016] 2. Excess almonds stored between the sealing mechanism and the drying chamber can roll into the drying chamber along the slope of the smoothed block. This ensures that the drying chamber is fully loaded with almonds before leaving the filling equipment, and that the almonds are evenly spread out within the drying chamber. This guarantees that the drying chamber maintains its balance while drying almonds in the drying chamber after leaving the filling equipment, and that the almonds are dried evenly within the drying chamber. This ensures that the drying process of almonds is not affected by uneven stacking, and improves the quality stability of the almond products. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the structure of the drying oven and filling equipment of the present invention when they are used together; Figure 3 yes Figure 2 Enlarged view of section A in the image; Figure 4 This is a three-dimensional structural cross-sectional view of the filling equipment and related structures of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the drying oven and filling equipment of the present invention when they are used together; Figure 6 This is a three-dimensional structural cross-sectional view of the smoothing block of the present invention during almond smoothing operations.

[0019] In the diagram: 1. Stepper motor; 2. Circulating belt; 3. Drying oven; 4. Connecting shaft; 5. Ventilation hole; 6. Filling equipment; 7. Filling port; 8. Sealing mechanism; 9. Fruit blocking baffle; 10. Inlet; 11. Opening spring; 12. Left sealing plate; 13. Right sealing plate; 14. Electric push rod; 15. Gap plate; 16. Limiting block; 17. Fruit storage plate; 18. Smoothing groove; 19. Smoothing block; 20. Anti-drop plate. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 6 As shown, an embodiment of the present invention provides a nut drying device for almond product production, comprising: Stepper motor 1, which is fixedly connected to the mounting bracket inside the drying chamber; The loop belt 2 is driven by the stepper motor 1 to perform directional periodic circulation; Also includes: The drying chamber 3, with multiple sets of drying chambers 3 arranged at equal intervals, is hinged to the circulating belt 2 via connecting shafts 4 in the middle of the two side walls; ventilation holes 5 are provided at the bottom and all four side walls of the drying chamber 3. The filling equipment 6 is installed on the top of the drying chamber and is used to fill the harvested almonds evenly and in appropriate amounts into the drying box 3.

[0022] In one embodiment of the present invention, the drying oven 3 is made of a side wall made of lightweight heat-resistant plastic and a metal base plate made of heavy metal material bonded together. The mass of almonds fully loaded in a single drying oven 3 is less than the mass of the metal base plate.

[0023] In one embodiment of the present invention, the filling device 6 includes: The filling port 7 is fixedly connected to the top of the filling equipment 6. The filling port 7 is a frustum-shaped structure with an opening cross-section that gradually increases from bottom to top. A sealing mechanism 8 is installed at the lower end of the filling port 7 and is located inside the filling equipment 6; the sealing mechanism 8 is used to release an appropriate amount of almonds into the drying box 3. Fruit blocking baffle 9 is hinged to one side wall of the filling equipment 6 near the drying box 3. The inlet 10 is located at the lower end of the fruit-blocking baffle 9, and the width of the inlet 10 is the same as the width of the drying oven 3. The opening spring block 11 is slidably connected to the inner wall of the filling equipment 6 along the length of the drying box 3. The opening spring block 11 is used to control the opening and closing of the sealing mechanism 8.

[0024] In one embodiment of the present invention, the sealing mechanism 8 includes: Left sealing plate 12, which is fixedly connected to the inner wall of the filling equipment 6; The right sealing plate 13 extends into the inner wall of the filling equipment 6 at one end away from the left sealing plate 12. The portion of the right sealing plate 13 extending into the inner wall of the filling equipment 6 is fixedly connected to the electric push rod 14 installed inside the filling equipment 6. The right sealing plate 13 slides up and down along the inner wall of the filling equipment 6 under the action of the electric push rod 14. When the side wall of the right sealing plate 13 rises to the highest position, it fits tightly against the side wall of the left sealing plate 12.

[0025] In one embodiment of the present invention, the portions of the left sealing plate 12 and the right sealing plate 13 that extend into the inner cavity of the filling device 6 are both straight plates that slope downwards, and the two side walls on which the left sealing plate 12 and the right sealing plate 13 fit together are both inclined slopes.

[0026] In one embodiment of the present invention, a baffle plate 15 is fixedly connected above the end of the right sealing plate 13 near the inner wall of the filling equipment 6, and the height of the baffle plate 15 is greater than the maximum stroke of the right sealing plate 13 sliding up and down.

[0027] During the almond drying process, firstly, the harvested and pre-treated almonds are fed into the filling equipment 6 through the filling port 7 at the top of the filling equipment 6. At this time, the sealing mechanism 8 inside the filling equipment 6 is closed, so the almonds entering the filling equipment 6 are temporarily stored inside the filling equipment 6 due to the obstruction of the sealing mechanism 8. Then, the stepper motor 1 driving the circulating belt 2 in the drying chamber is turned on, so that the circulating belt 2 begins to move intermittently for a fixed belt length under the action of the PLC control system, according to the set single rotation angle of the stepper motor 1. The specific single movement distance of the circulating belt 2 and the interval time between each movement are set according to the volume of the drying boxes 3 installed at equal intervals on the circulating belt 2 and the time required to fill the drying boxes 3 with almonds. The circulating belt 2 mentioned above can also be replaced with a V-belt or drive chain, etc., depending on the load conditions, and is not limited to the belt type shown in the attached figure. Standard; Since the upper part of the drying chamber 3 is an open design, it is necessary to ensure that the opening of the drying chamber 3 remains vertically upward throughout the entire movement of the circulating belt 2. Otherwise, the almonds stored in the drying chamber 3 may spill out. To this end, the drying chamber 3 is hinged to the circulating belt 2 through the connecting shaft 4 in the middle of the two side walls, and the side wall part of the drying chamber 3 is made of lightweight heat-resistant plastic and the metal base plate is made of heavy metal material. The mass of almonds fully loaded in a single drying chamber 3 is less than the mass of the metal base plate. This ensures that even if there is a slight unevenness in the almonds stored in the drying chamber 3, the opening of the drying chamber 3 will always remain upward due to the gravity of the heavier metal base plate. This ensures that the almonds in the drying chamber 3 will not spill out during the movement of the circulating belt 2, and that the drying chamber 3 can dry as many almonds as possible in the drying chamber. When the empty drying chamber 3, driven by the circulating belt 2, pushes the fruit-blocking baffle 9 hinged to the filling equipment 6 and finally moves along the inlet 10 into the filling equipment 6, the drying chamber 3 approaches the outer wall of the filling equipment 6 and pushes the opening spring block 11 slidably connected to the inner wall of the filling equipment 6, thereby activating the right sealing plate 13 of the sealing mechanism 8. This causes the right sealing plate 13 to slide downwards along the inner wall of the filling equipment 6 under the action of the electric push rod 14. Since the side wall portion where the left sealing plate 12 and the right sealing plate 13 are in contact is... The inclined slope ensures that once the right sealing plate 13 moves, a gap immediately appears between the left sealing plate 12 and the right sealing plate 13, allowing the almonds above the sealing mechanism 8 to be released into the drying chamber 3 below as quickly as possible, improving the loading efficiency of the drying chamber 3. When the drying chamber 3 no longer pushes it, the fruit-blocking baffle 9 immediately returns to its vertically downward position under the action of the torsion spring at the hinge, sealing the relevant area of ​​the filling equipment 6 above the drying chamber 3, preventing the almonds from being released when the sealing mechanism 8 opens. When almonds fall into the drying chamber 3, they may be ejected from the drying chamber 3 due to contact or collision. Since the electric push rod 14 controlling the up-and-down sliding of the right sealing plate 13 is installed inside the filling equipment 6, and when the right sealing plate 13 slides downwards under the action of the electric push rod 14, there are almonds piled on top of it. Therefore, when the right sealing plate 13 slides downwards, the almonds on top may roll into the sliding groove of the right sealing plate 13, thus affecting the subsequent upward repositioning of the right sealing plate 13. Therefore, when the right sealing plate 13 is connected to… A baffle plate 15 with a height greater than the maximum downward movement distance of the right sealing plate 13 is fixedly connected to the upper part of one end of the inner wall of the filling equipment 6. Thus, even if the right sealing plate 13 moves downward, the sliding groove opened along the inner wall of the filling equipment 6 to connect with the electric push rod 14 will not be exposed as the right sealing plate 13 moves downward. Instead, it will be blocked by the baffle plate 15 that moves downward with it. This ensures that the right baffle of the sealing mechanism 8 can operate in multiple cycles, reduces the failure rate of the sealing mechanism 8, and improves the working efficiency of the filling equipment 6.

[0028] In one embodiment of the present invention, a limiting block 16 is elastically connected to the upper end of the two long side walls of the drying oven 3 near the fruit-blocking baffle 9. The end of the limiting block 16 near the fruit-blocking baffle 9 is an inclined surface, and the inclination angle of the inclined surface of the limiting block 16 is no greater than 30°.

[0029] In one embodiment of the present invention, a fruit storage plate 17 is slidably connected to one end of the filling device 6 away from the inlet 10 along the inner wall of the filling device 6. A smoothing groove 18 is also provided on the side wall of the fruit storage plate 17 away from the inlet 10. A smoothing block 19 driven by a cylinder is slidably connected in the smoothing groove 18. The front end of the smoothing block 19 is designed with a slope, and the front slope of the smoothing block 19 contacts and cooperates with the inclined side wall at the lower end of the fruit storage plate 17.

[0030] In one embodiment of the present invention, an opening spring block 2 is installed at the top of the slide groove where the fruit storage plate 17 is located, the height of the smoothing block 19 is greater than the height of the drying box 3, and the two end side walls of the smoothing block 19 are fixedly connected with anti-drop plates 20 that are longer than the smoothing block 19 and extend forward.

[0031] In one embodiment of the present invention, the lower end of the forward-extending portion of the anti-fall plate 20 is chamfered at a large angle, and the thickness of the anti-fall plate 20 is the same as the thickness of the side wall of the drying oven 3.

[0032] During operation, when the drying chamber 3 completes a single movement of the circulating belt 2 through the inlet 10 and contacts the inner wall of the filling equipment 6, triggering the opening spring 11, only about half of the volume of the drying chamber 3 extends into the filling equipment 6. If only this part of the volume is filled with almonds, on the one hand, the drying chamber 3 will not reach its maximum capacity for almonds, greatly reducing the drying efficiency of the almonds in the drying chamber; on the other hand, if only one side is filled with almonds, the mass balance of the drying chamber 3 will inevitably be disrupted. When the drying chamber 3 is inside the filling equipment 6, it can still maintain a horizontal position thanks to the support of the connecting shaft 4 of the drying chamber 3 and the inner wall of the filling equipment 6. However, once the circulating belt 2 continues to move, the drying chamber 3 will leave the filling equipment 6, and the drying chamber 3 is very likely to deflect. This causes some almonds to spill out of the drying box 3, resulting in almond loss. To address this, there is an almond storage area approximately half the volume of the drying box 3 between the lowest position of the sealing mechanism 8 and the inlet 10. Thus, when the right sealing plate 13 is opened, the almonds leaking from above the sealing mechanism 8 will not only fill the portion of the drying box 3 that extends into the filling equipment 6, but the remaining portion will also continue to accumulate above it until it fills the almond storage area between it and the sealing mechanism 8. At the upper end of the two long side walls of the drying box 3, near the fruit-blocking baffle 9, there is an elastically connected limiting block 16 with an inclined angle of no more than 30°. This prevents the fruit-blocking baffle 9, which is hinged in this area, from being pushed away by the almonds stored in this area. After the area is filled with almonds, approximately half the volume of the drying box 3, the cylinder (not shown in the figure) connected to the smoothing block 19 is activated, pushing the smoothing block 19 to slide horizontally inward along the smoothing groove 18. As the smoothing block 19 continues to extend inward, the inclined surface at the front end of the smoothing block 19 gradually pushes the fruit storage plate 17 upward. When the fruit storage plate 17 is completely pushed open and slides to the top of its sliding groove, it pushes the opening spring block 2 installed there, causing the electric push rod 14 of the sealing mechanism 8 to move again, moving the right sealing plate 13 upward, so that the left sealing plate 12 and the right sealing plate 13 are resealed. At this time, the anti-drop plate 20, which is fixedly connected to the side walls of both ends of the smoothing baffle, also comes into contact with the fruit blocking baffle 9. In the subsequent continued movement, under the action of the cylinder, it overcomes the torsion spring torque of the fruit blocking baffle 9 itself and the obstruction of the limiting block 16, pushing the fruit blocking baffle 9 open, so that... Excess almonds stored between the sealing mechanism 8 and the drying chamber 3 can roll into the drying chamber 3 along the inclined surface of the smoothing block 19. Due to the presence of the anti-drop plate 20, the almonds rolling down will not spill out from the side of the drying chamber 3, ensuring that all the almonds can fall into the drying chamber 3. The almonds that have already fallen into the drying chamber 3 will also be continuously smoothed by the action of the lower end plane of the smoothing block 19. Thus, before leaving the filling equipment 6, the drying chamber 3 can be fully loaded with almonds and the almonds can be evenly spread in the drying chamber 3. This ensures that when the drying chamber 3 leaves the filling equipment 6 and dries the almonds in the drying chamber, it can maintain its own balance and the almonds can be evenly dried in the drying chamber 3. This ensures that the drying process of the almonds will not be affected by uneven stacking and improves the quality stability of the almond products.

[0033] The foregoing has shown and described the basic principles, main features, and significant advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the specific embodiments described above. Without departing from the spirit and scope of the present invention, various changes and improvements may be made to adapt to different usage environments and customer needs, and all such changes and improvements fall within the protection scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nut drying apparatus for almond product production, comprising: Stepper motor (1), which is fixedly connected to the mounting bracket inside the drying chamber; The loop belt (2) is driven by the stepper motor (1) to perform directional periodic looping; Its characteristic is that it further includes: The drying chamber (3) is composed of multiple sets of drying chambers (3) arranged at equal intervals, which are hinged to the circulating belt (2) through the connecting shaft (4) in the middle of the two side walls; ventilation holes (5) are provided at the bottom and all four side walls of the drying chamber (3); Filling equipment (6), the filling equipment (6) is installed on the top of the drying chamber, the filling equipment (6) is used to fill the harvested almonds evenly and appropriately into the drying box (3); The filling equipment (6) includes: The filling port (7) is fixedly connected to the top of the filling equipment (6). The filling port (7) is a frustum-shaped structure with an opening cross section that gradually increases from bottom to top. A sealing mechanism (8) is installed at the lower end of the filling port (7) and located inside the filling equipment (6); the sealing mechanism (8) is used to release an appropriate amount of almonds into the drying box (3); Fruit blocking baffle (9), said fruit blocking baffle (9) is hinged to the side wall of the filling equipment (6) near the drying box (3); The inlet (10) is located at the lower end of the fruit-blocking baffle (9), and the width of the inlet (10) is the same as the width of the drying box (3). Unsealing spring block one (11) is slidably connected to the inner wall of the filling equipment (6) along the length of the drying box (3), and the unsealing spring block one (11) is used to control the opening and closing of the sealing mechanism (8); Left sealing plate (12), the left sealing plate (12) is fixedly connected to the inner wall of the filling equipment (6); The right sealing plate (13) extends into the inner wall of the filling equipment (6) at the end away from the left sealing plate (12). The part of the right sealing plate (13) extending into the inner wall of the filling equipment (6) is fixedly connected to the electric push rod (14) installed inside the filling equipment (6). The right sealing plate (13) slides up and down along the inner wall of the filling equipment (6) under the action of the electric push rod (14). When the side wall of the right sealing plate (13) rises to the highest position, it fits tightly against the side wall of the left sealing plate (12).

2. The nut drying device for almond product production according to claim 1, characterized in that: The drying oven (3) is made of a side wall made of lightweight heat-resistant plastic and a metal base plate made of heavy metal material. The mass of almonds fully loaded in a single drying oven (3) is less than the mass of the metal base plate.

3. A nut drying device for almond product production according to claim 1, characterized in that: The portions of the left sealing plate (12) and the right sealing plate (13) that extend into the inner cavity of the filling equipment (6) are both straight plates that slope downwards, and the two side walls on which the left sealing plate (12) and the right sealing plate (13) fit together are both inclined slopes.

4. A nut drying device for almond product production according to claim 1, characterized in that: A baffle plate (15) is fixedly connected above the end of the right sealing plate (13) near the inner wall of the filling equipment (6). The height of the baffle plate (15) is greater than the maximum stroke of the right sealing plate (13) sliding up and down.

5. A nut drying device for almond product production according to claim 1, characterized in that: The upper end of the two long side walls of the drying oven (3) is elastically connected to the fruit-blocking baffle (9), and the end of the limiting block (16) near the fruit-blocking baffle (9) is inclined, and the inclination angle of the inclined surface of the limiting block (16) is no greater than 30°.

6. A nut drying device for almond product production according to claim 5, characterized in that: The filling equipment (6) has a fruit storage plate (17) slidably connected to one end away from the inlet (10) along the inner wall of the filling equipment (6). The filling equipment (6) also has a smoothing groove (18) on the side wall of the fruit storage plate (17) away from the inlet (10). A smoothing block (19) driven by a cylinder is slidably connected in the smoothing groove (18). The front end of the smoothing block (19) is designed with a slope. The front slope of the smoothing block (19) contacts and cooperates with the inclined side wall of the lower end of the fruit storage plate (17).

7. A nut drying device for almond product production according to claim 6, characterized in that: The top of the groove where the fruit storage plate (17) is located is equipped with an opening spring block 2. The height of the smoothing block (19) is greater than the height of the drying box (3). The two side walls of the smoothing block (19) are fixedly connected with anti-drop plates (20) that are longer than the smoothing block (19) and extend forward.

8. A nut drying device for almond product production according to claim 7, characterized in that: The lower end of the forward extension of the anti-fall plate (20) is chamfered at a large angle, and the thickness of the anti-fall plate (20) is the same as the side wall thickness of the drying oven (3).

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