A baking food blowing drying oven

Abstract

The application discloses a kind of baking food blast drying oven, it is related to food drying technical field, including drying oven shell, the tank of being installed in the inside of drying oven shell, be set in the left and right sides of tank and be fixed in the bottom tank of tank lower end, the inside of drying oven shell is at least installed with two around wind channel structure from top to bottom, the top of tank is installed with and the air inlet of around wind channel structure is connected electric heating air blowing component, the left and right sides of tank bottom are respectively provided with the disc type shelf that can rotate around its own axis, the inside of bottom tank is installed with and the magnetic key shaft connection component of selectively power connection of disc type shelf is carried out.The application makes baked goods rotate around the axis of disc type shelf, and follow dynamic air duct structure rotation air supply, while variable speed adjusting assembly provides power for side inner air blowing component, forms inner circulation air area at tank inner wall, realizes the position dynamic change of baked goods in drying process and the optimization of air flow field.

Description

Technical Field

[0001] This invention relates to the field of food drying technology, and more particularly to a forced-air drying oven for baked goods. Background Technology

[0002] In the post-processing of various baked goods such as biscuits, pastries, bread dough, and nut products, baked goods often have a dry surface but still contain a certain amount of free moisture inside. Direct packaging would affect the taste and appearance. Forced-air drying ovens are mainly used for the subsequent drying of baked goods, preventing problems such as softening, mold, and deformation due to excessive residual moisture. They also improve the crispness of the food and extend its shelf life. These machines feature a sealed enclosure structure made of food-grade stainless steel with a smooth, easy-to-clean inner wall to prevent food debris and grease residue. The outer shell is equipped with an insulation layer to reduce heat loss. The internal core consists of a heating system, a circulating forced-air system, a precise temperature control system, adjustable shelves, and a sealing and protective device. The heating elements are mostly electric heating tubes or heating coils, providing a stable heat source. A centrifugal fan, combined with a dedicated air duct, ensures even hot air circulation. Temperature sensors and a temperature controller work together to maintain a constant temperature. The door is sealed with a high-temperature resistant sealing strip to prevent heat loss and the entry of external contaminants.

[0003] In its specific operation, the heating system generates heat, and the fan synchronously drives the hot air to continuously circulate and convect within the chamber, ensuring a uniform temperature throughout. When the hot air comes into contact with the food, it promotes the evaporation of internal free moisture. The circulating airflow promptly removes the water vapor, preventing excessive humidity from affecting the drying effect. Simultaneously, the temperature control system automatically adjusts the heating intensity according to the set values ​​to maintain a constant temperature environment. Under the gentle and uniform action of the hot air, the food is dried and shaped. During this process, the air supply surface of the forced-air drying oven is usually fixed, with several air outlets or slits opened on the rear or side walls of the chamber. Hot air is ejected with a certain initial velocity and direction. As the hot air leaves the outlet, the wind speed rapidly decreases with increasing distance. Baked goods located outside the racks (near the outlet) are first directly subjected to the high-speed, high-temperature airflow, which... The heat transfer coefficient is high, and moisture evaporates rapidly. However, the baked goods inside the rack (far from the air outlet, such as near the door or deep in the center of the rack) can only receive residual airflow after it has been blocked, refracted, and slowed down by the baked goods outside. At this point, the airflow speed has been greatly reduced, and a low-speed backflow zone or stagnation zone may even be formed. Hot air cannot effectively penetrate the material layer, resulting in a significant decrease in the heat exchange efficiency of the surface of the baked goods inside the rack. As a result, the final moisture content, crispness, color, and flavor of baked goods in different positions in the drying oven will vary. Faced with uneven drying, operators need to manually flip the trays and change the rack positions during the drying process. However, this manual operation is not only labor-intensive, but it is also difficult to make precise and uniform adjustments. At the same time, opening the oven door at irregular intervals will cause a large amount of heat to be lost, disrupting the temperature field stability, increasing the complexity of the process, and increasing the defect rate. Summary of the Invention

[0004] The purpose of this invention is to provide a forced-air drying oven for baked goods. Hot air generated by an electric heating blower assembly is delivered into the oven through a closed-loop air duct structure within the oven chamber, contacting the baked goods on the tray shelves on both sides. During this process, the closed-loop air duct structure also diverts the hot air to a following-type air duct structure, which then delivers air to the center of the oven chamber. The control panel activates the motor and a bevel gear dual-position transmission assembly, which distributes power to the speed adjustment assemblies on the left and right sides of the oven chamber. These speed adjustment assemblies then distribute power to the tray shelves and the following-type air duct structure. A magnetic key shaft connection assembly connects to the corresponding tray shelves, causing the baked goods to rotate around an axis, while the following-type air duct structure rotates to deliver air. Simultaneously, the speed adjustment assembly also provides power to the inner blower assembly at the edges, forming an internal circulation air zone on the inner wall of the oven chamber. This achieves dynamic positional changes in the baked goods and uniform forced-air drying, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a drying oven for baking food, comprising a drying oven shell, a liner installed inside the drying oven shell, cavities disposed on the left and right sides of the liner, and a bottom box fixed to the lower end of the liner. At least two enclosed air duct structures are installed inside the drying oven shell from top to bottom. An electric heating blower assembly connected to the air inlet of the enclosed air duct structure is installed at the top of the liner. Disc-shaped shelves rotatable around their own axes are respectively disposed on the left and right sides of the bottom of the liner. A magnetic key shaft connecting assembly selectively connected to the disc-shaped shelves is installed inside the bottom box. A following air duct structure is vertically disposed between the disc-shaped shelves on the left and right sides. The air inlet of the following air duct structure is connected to the air outlet of the uppermost enclosed air duct structure. The following air duct structure and one of the magnetic key shaft connecting assemblies are kept in a dynamic connection.

[0006] Each compartment is equipped with an L-shaped side frame, with a portion of the horizontal end of the L-shaped side frame extending into the bottom chamber. A speed adjustment assembly is installed on one inner wall of the L-shaped side frame, and side-position internal blower assemblies are provided on both the left and right inner walls of the drying chamber shell. A bevel gear double-position transmission assembly is provided on the back of the drying chamber shell, which outputs power to the speed adjustment assemblies on both sides. A motor for driving the bevel gear double-position transmission assembly is installed on one outer wall of the drying chamber shell. The speed adjustment assembly has two power output ends. One power output end drives the corresponding side disc shelf to rotate through a magnetic key shaft connection assembly, and the other power output end drives the side-position internal blower assembly to operate. A control panel is installed on one side of the surface of the drying chamber shell, and the output end of the control panel is electrically connected to the electric heating blower assembly, the magnetic key shaft connection assembly, and the motor.

[0007] Preferably, the following type of air duct structure includes a bearing seat, a hollow air duct, a convex shaft, and a constant velocity belt drive pair;

[0008] The bearing seat is fixed at the bottom of the box liner. The cam shaft is vertically rotatably mounted in the bearing seat through ball bearings. The hollow air duct is fixed at the upper end of the cam shaft, and a rotary joint is installed at the upper end of the hollow air duct. The rotary joint is used to connect with the air outlet of the uppermost enclosed air duct structure. The constant speed belt drive pair is set at the lower end of the cam shaft and connected to one of the magnetic key shaft connecting components.

[0009] Preferably, the disc shelf includes a right-angled platform integrally formed on the top of the bearing seat, a bottom shaft vertically rotatably mounted in the right-angled platform via bearings, a vertical shaft coaxially fixed to the upper end of the bottom shaft, and a plurality of circular grid trays installed at equal intervals along the axis of the vertical shaft, wherein a rectangular cavity is provided at the lower end of the bottom shaft.

[0010] Preferably, the magnetic key shaft connection assembly includes a base, a shaft base, a steel plate, an electromagnet, an internal spline hollow shaft, and an external spline shaft;

[0011] The base is fixed to one side of the bottom of the base box, and the shaft is fixed to the outer wall of the L-shaped side frame near the following wind tunnel structure. A steel plate is set between the shaft and the base, and elastic elements for connecting with the base are installed at the corner of the bottom of the steel plate. The inner spline hollow shaft is rotatably installed on the upper end of the shaft. The outer spline shaft is coaxially sleeved inside the inner spline hollow shaft, and the lower end of the outer spline shaft passes through the shaft and is rotatably connected with the steel plate. The upper end of the outer spline shaft passes through the inner spline hollow shaft and is integrally formed with a rectangular protrusion. The rectangular protrusion and the rectangular cavity are inserted into each other. The constant speed belt drive pair is installed at the upper position of the inner spline hollow shaft and enters the shaft seat to connect with the cam shaft.

[0012] Preferably, the speed adjustment assembly includes a main conical roller shaft and a secondary conical roller shaft vertically rotatably mounted on the outer wall of the L-shaped side frame via bearing seats, and a transmission belt mounted on the main conical roller shaft and the secondary conical roller shaft. A belt drive pair is installed between the lower end of the main conical roller shaft and the inner spline hollow shaft. A C-shaped frame is fixed on one side of the outer wall of the L-shaped side frame. Two vertical uprights are fixed at the bottom of the C-shaped frame, and a sleeve rod is sleeved on each upright. Two clamping wheels are rotatably mounted on the opposite side outer walls of the two sleeve rods. The two clamping wheels are distributed on the upper and lower sides of the transmission belt. A connecting beam is integrally formed between the two sleeve rods. A servo electric cylinder is installed at the top of the C-shaped frame, and the lower end of the output shaft of the servo electric cylinder is fixedly connected to the upper end of the sleeve rod.

[0013] Preferably, the bevel gear dual-position transmission assembly includes a bevel gear longitudinal shaft and a bevel gear vertical shaft rotatably mounted on the opposite outer walls of two L-shaped side frames via bearing seats, and a constant velocity chain transmission pair for connecting the two bevel gear longitudinal shafts. The bevel gear longitudinal shaft and the bevel gear vertical shaft mesh with each other, and the upper end of one of the bevel gear vertical shafts is fixedly connected to the output shaft of the motor via a coupling. A belt transmission pair is installed between the main conical roller shaft and the bevel gear vertical shaft.

[0014] Preferably, the side-position internal blower assembly includes a cross-flow fan fixed on the inner wall of one side of the box liner, a tail shaft that rotates vertically on the outer wall of the L-shaped side frame, and a speed-increasing belt drive pair installed between the upper end of the tail shaft and the input shaft of the cross-flow fan. A belt drive pair is installed between the lower end of the tail shaft and the secondary conical roller shaft.

[0015] Preferably, the enclosed air duct structure includes a U-shaped perforated air duct set inside the chamber, a main air duct fixed to one side of the inner wall of the chamber, and several guide channels installed between the main air duct and the U-shaped perforated air duct. A secondary air duct is installed on one side of the inner wall of the U-shaped perforated air duct, which is perpendicular to the outer cabinet door of the drying oven. The rotary joint is installed at the bottom of the secondary air duct.

[0016] Preferably, the electric heating blower assembly includes a blower installed at the top of the chamber, a rectangular shell fixed to the blower outlet, a sealing box fixed to the back of the chamber and connected to the main air duct, and an electric heating tube installed inside the sealing box. An exhaust pipe is installed between the rectangular shell and the sealing box.

[0017] Preferably, a cavity is provided between the uppermost U-shaped perforated air duct and the top wall of the box liner, and a hanging basket is slidably installed in the cavity along the width direction of the box liner.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The drying oven for baked goods is equipped with a structure that includes an enclosed air duct structure, a disc shelf, a magnetic key shaft connection assembly, a follow-up air duct structure, a speed adjustment assembly, an inner side air blower assembly, and a bevel gear double-position transmission assembly. This structure allows the baked goods to rotate around the axis of the disc shelf, and the follow-up air duct structure rotates to deliver air. At the same time, the speed adjustment assembly provides power to the inner side air blower assembly, forming an internal circulation air zone on the inner wall of the oven, thereby realizing the dynamic change of the position of the baked goods and the optimization of the airflow field during the drying process.

[0019] 1. The enclosed air duct structure delivers hot air into the chamber and also diverts the hot air to the following air duct structure located in the center of the chamber. The following air duct structure actively delivers air in the central area, so that the baked goods inside the rack can also receive high-temperature and high-speed airflow from the center direction. This significantly reduces the wind speed and temperature differences in different positions inside the chamber. At the same time, the following air duct rotates and delivers air, further distributing the hot air evenly to all surrounding angles, avoiding dead corners formed by fixed-direction airflow. In addition, the side blower components form an internal circulation air zone on the inner wall of the chamber, allowing the hot air near the wall to re-enter the circulation, preventing airflow short-circuiting or stagnation near the wall, and eliminating unevenness caused by distance and obstruction.

[0020] 2. In traditional static placement, the same piece of baked goods always faces the wind with a fixed side, resulting in different levels of dryness between the windward and leeward sides. Each tray shelf can rotate independently as needed, causing the baked goods placed on it to continuously change their angle relative to the airflow direction. This periodically faces the following air duct structure, wall air duct, and edge internal blower components, making the total heat and total convective mass received by each product tend to be consistent.

[0021] 3. The bevel gear dual-position transmission assembly simultaneously distributes the power of a single motor to the speed adjustment assemblies on both the left and right sides. Each speed adjustment assembly then drives the disc shelf, the following air duct structure, and the side internal blower assembly, achieving synchronous linkage of all moving parts. This eliminates the need for separate motors for the disc shelf, rotating air duct, and side internal blower assembly, simplifying the electrical control system. Furthermore, the speed adjustment assemblies can independently adjust the power distribution ratio of their respective side internal blower assemblies. For example, the speed of the side internal blower assembly can be increased when strong internal circulation is needed in the early stages of drying, and decreased when a gentler airflow is needed in the later stages of drying, adapting to the drying curves of various baked goods. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the present invention. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of the present invention. Figure 2 ;

[0026] Figure 4 This is a side cross-sectional view of the present invention.

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0028] Figure 6 This is a three-dimensional structural diagram of the two L-shaped side frames of the present invention separated from the cavity of the drying oven shell;

[0029] Figure 7 This is a three-dimensional structural diagram of the following wind tunnel structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the three-dimensional cross-sectional structure of the following air duct structure and the disc-type shelf structure of the present invention;

[0031] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B;

[0032] Figure 10 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0033] Figure 11 This is a three-dimensional structural diagram of the speed regulation component of the present invention;

[0034] Figure 12 This is a three-dimensional structural diagram of the edge-mounted internal blower assembly of the present invention;

[0035] Figure 13 This is a schematic diagram of the three-dimensional structure of the C-frame of the present invention;

[0036] Figure 14 This is a three-dimensional structural diagram of the enclosed air duct structure of the present invention;

[0037] Figure 15 This is a three-dimensional structural diagram of the electric heating blower assembly of the present invention.

[0038] In the diagram: 1. Drying oven outer shell; 101. Chamber; 102. L-shaped side frame; 2. Inner chamber; 3. Bottom chamber; 4. Enclosed air duct structure; 41. Main air duct; 42. U-shaped perforated air duct; 43. Guide channel; 44. Secondary air duct; 5. Electric heating blower assembly; 51. Sealing box; 52. Blower; 53. Rectangular shell; 54. Exhaust pipe; 55. Electric heating element; 6. Follow-up air duct structure; 61. Shaft seat; 6101. Right-angle platform; 62. Hollow air duct; 63. Convex shaft; 64. Constant velocity belt drive pair; 65. Rotary joint; 7. Disc-type shelf; 71. Vertical shaft; 72. Circular mesh tray; 73. Bottom shaft; 731. Rectangular cavity; 8. Magnetic key shaft connection assembly; 81. Bottom platform; 82. Shaft platform; 83. Steel plate; 8 4. Elastic component; 85. Electromagnet; 86. Hollow shaft with internal spline; 87. External spline shaft; 88. Belt drive pair II; 89. Rectangular protrusion; 9. Speed ​​adjustment assembly; 91. Main conical roller shaft; 92. Secondary conical roller shaft; 93. Drive belt; 94. C-frame; 95. Servo electric cylinder; 96. Sleeve rod; 961. Connecting beam; 97. Clamping wheel; 98. Upright pole; 10. Side internal blower assembly; 1001. Tail shaft; 1002. Cross-flow fan; 1003. Speed-increasing belt drive pair; 1004. Belt drive pair IV; 11. Bevel gear double-position transmission assembly; 1101. Bevel gear longitudinal shaft; 1102. Bevel gear vertical shaft; 1103. Belt drive pair III; 1104. Constant velocity chain drive pair; 12. Motor; 13. Control panel. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0040] Example 1, by Figures 1 to 6The present invention includes a drying oven shell 1, a box liner 2 installed inside the drying oven shell 1, a partition 101 disposed on the left and right sides of the box liner 2, and a bottom box 3 fixed to the lower end of the box liner 2. The box liner 2 forms a working cavity that directly contains baked goods and hot air. Its inner surface is smooth and corrosion-resistant and can withstand a certain temperature and humidity.

[0041] The interior of the drying oven shell 1 is equipped with at least two enclosed air duct structures 4 from top to bottom. The top of the chamber 2 is equipped with an electric heating blower assembly 5 connected to the air inlet of the enclosed air duct structure 4. The bottom left and right sides of the chamber 2 are respectively provided with disc-shaped shelves 7 that can rotate around their own axis. The bottom chamber 3 is equipped with a magnetic key shaft connecting assembly 8 that is selectively powered to the disc-shaped shelves 7. A following air duct structure 6 is vertically arranged between the disc-shaped shelves 7 on the left and right sides. The air inlet of the following air duct structure 6 is connected to the air outlet of the uppermost enclosed air duct structure 4. The following air duct structure 6 and one of the magnetic key shaft connecting assemblies 8 are powered to each other.

[0042] Staff decide whether to connect the magnetic key shaft connection assembly 8 and the tray shelf 7 based on the post-drying requirements of various baked goods such as biscuits, bread rusks, nuts, and fruit and vegetable crisps, which determines whether the tray shelf 7 will start to rotate.

[0043] Each compartment 101 is equipped with an L-shaped side frame 102. A portion of the horizontal end of the L-shaped side frame 102 extends into the bottom box 3. A speed adjustment component 9 is installed on one inner wall of the L-shaped side frame 102. Side internal blower components 10 are provided on the left and right inner walls of the drying chamber shell 1. A bevel gear double-position transmission component 11 is provided on the back of the drying chamber shell 1. The bevel gear double-position transmission component 11 is used to output power to the speed adjustment components 9 on both sides. A motor 12 is installed on one outer wall of the drying chamber shell 1 to drive the bevel gear double-position transmission component 11. The speed adjustment component 9 has two power output ends. One power output end drives the corresponding side disc shelf 7 to rotate through the magnetic key shaft connection component 8. The other power output end drives the side internal blower component 10 to operate. A control panel 13 is installed on one side of the surface of the drying chamber shell 1. The output end of the control panel 13 is electrically connected to the electric heating blower component 5, the magnetic key shaft connection component 8, and the motor 12.

[0044] Example 2, based on Example 1, is... Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the following type of ventilation duct structure 6 includes a bearing 61, a hollow ventilation duct 62, a cam shaft 63, and a constant velocity belt drive pair 64;

[0045] The bearing seat 61 is fixed to the bottom of the box liner 2. The convex shaft 63 is vertically rotatably installed in the bearing seat 61 through ball bearings. The hollow air duct 62 is fixed to the upper end of the convex shaft 63, and a rotary joint 65 is installed at the upper end of the hollow air duct 62. The rotary joint 65 is used to connect with the air outlet of the uppermost enclosed air duct structure 4. The constant speed belt drive pair 64 is set at the lower end of the convex shaft 63 and connected to one of the magnetic key shaft connecting components 8.

[0046] The top enclosed air duct structure 4 diverts hot air into the hollow air duct 62. At this time, the hot air is evenly sent out horizontally in all directions through the holes in the duct wall. The central air supply source makes up for the attenuation of the wall air supply in the central area of ​​the box, so that the baked goods inside can get enough airflow. The rotating air outlet makes the hot air coverage angle change continuously, reducing the blind spots formed by fixed direction air supply.

[0047] The tray shelf 7 includes a right-angled platform 6101 integrally formed on the top of the bearing 61, a bottom shaft 73 vertically rotatably mounted in the right-angled platform 6101 via bearings, a vertical shaft 71 coaxially fixed to the upper end of the bottom shaft 73, and several circular grid trays 72 equally spaced along the axis of the vertical shaft 71. The lower end of the bottom shaft 73 is provided with a rectangular cavity 731. The lower end of the bottom shaft 73 is inserted into the magnetic key shaft connecting assembly 8 through the rectangular cavity 731 to achieve selective power input. After the magnetic key shaft connecting assembly 8 transmits the power of the speed adjustment assembly 9 to the tray shelf 7, the bottom shaft 73 and the vertical shaft 71 rotate, causing the baked goods on the circular grid trays 72 to rotate around the axis, continuously changing their position relative to the air supply direction, so that each baked good is periodically exposed to hot air from different directions, eliminating the drying difference between the windward and leeward sides when fixedly placed.

[0048] The magnetic key shaft connection assembly 8 includes a base 81, a shaft base 82, a steel plate 83, an electromagnet 85, an internal spline hollow shaft 86, and an external spline shaft 87.

[0049] The base platform 81 is fixed to one side of the bottom of the base box 3, and the shaft platform 82 is fixed to the outer wall of the L-shaped side frame 102 near the following wind tunnel structure 6. The steel plate 83 is set between the shaft platform 82 and the base platform 81, and the corner of the bottom end of the steel plate 83 is equipped with an elastic element 84 for connecting with the base platform 81. The inner spline hollow shaft 86 is rotatably installed on the upper end of the shaft platform 82. The outer spline shaft 87 is coaxially sleeved inside the inner spline hollow shaft 86, and the lower end of the outer spline shaft 87 passes through the shaft platform 82 and is rotatably connected with the steel plate 83. The upper end of the outer spline shaft 87 passes through the inner spline hollow shaft 86 and is integrally formed with a rectangular protrusion 89. The rectangular protrusion 89 and the rectangular cavity 731 are inserted into each other. The constant speed belt drive pair 64 is installed at the upper position of the inner spline hollow shaft 86 and enters the shaft seat 61 to connect with the cam shaft 63.

[0050] When the electromagnet 85 is de-energized, the elastic element 84 provides an upward elastic force to the steel plate 83 and the external spline shaft 87, so that the rectangular protrusion 89 at the upper end of the external spline shaft 87 is firmly connected to the disc shelf 7.

[0051] When the inner spline hollow shaft 86 receives rotational power from the speed adjustment component 9 through the belt drive pair 2 88, the outer spline shaft 87 and the inner spline hollow shaft 86 maintain a state of co-rotation, that is, the disc shelf 7 can obtain power input through the rectangular protrusion 89, thereby forming a torque-transmitting connection.

[0052] If the magnetic key shaft connecting assembly 8 does not require the corresponding tray shelf 7 and baked goods to rotate, the operator can turn on the electromagnet 85 through the control panel 13. The electromagnet 85 generates magnetic force, and then the steel plate 83 is magnetically attracted downward, causing the outer spline shaft 87 in the inner spline hollow shaft 86 to move down, and the elastic element 84 to be compressed until the rectangular protrusion 89 disengages from the lower end of the tray shelf 7.

[0053] Example 3, based on Example 2, by Figure 11 , Figure 12 and Figure 13 The speed adjustment assembly 9 includes a main conical roller shaft 91 and a secondary conical roller shaft 92, which are vertically rotatably mounted on the outer wall of the L-shaped side frame 102 via bearing seats, and a transmission belt 93 mounted on the main conical roller shaft 91 and the secondary conical roller shaft 92. A belt drive pair 88 is installed between the lower end of the main conical roller shaft 91 and the inner spline hollow shaft 86. A C-shaped frame 94 is fixed on one side of the outer wall of the L-shaped side frame 102. Two vertical uprights 98 are fixed at the bottom of the C-shaped frame 94, and each upright 98 is fitted with a sleeve rod 96. Two clamping wheels 97 are rotatably mounted on the opposite side outer walls of the two sleeve rods 96. The two clamping wheels 97 are distributed on the upper and lower sides of the transmission belt 93. A connecting beam 961 is integrally formed between the two sleeve rods 96. A servo electric cylinder 95 is installed at the top of the C-shaped frame 94. The lower end of the output shaft of the servo electric cylinder 95 is fixedly connected to the upper end of the sleeve rod 96.

[0054] The main conical roller 91 rotates together with the bevel gear shaft 1102 via the belt drive pair 1103, while the secondary conical roller 92 rotates together with the main conical roller 91 via the drive belt 93. During this process, the operator activates the servo cylinder 95 through the control panel 13. The servo cylinder 95 drives the sleeve rod 96, clamping wheel 97, and connecting beam 961 to move up and down, thereby changing the position of the drive belt 93 on the main conical roller 91 and the secondary conical roller 92, that is, adjusting the transmission ratio between the main conical roller 91 and the secondary conical roller 92. This allows for flexible adjustment of the speed of the inner blower assembly 10 according to the type of baked goods and the drying stage. For example, a higher speed can be used in the early stage of drying to enhance heat exchange, while the speed can be reduced in the later stage of drying to prevent the baked goods from breaking.

[0055] The upright 98 is used to guide the sleeve 96 and the clamping wheel 97 to slide vertically, improve the sliding stability of the sleeve 96 and the clamping wheel 97 and maintain a static steady state;

[0056] The bevel gear dual-position transmission assembly 11 includes a bevel gear longitudinal shaft 1101 and a bevel gear vertical shaft 1102 rotatably mounted on the opposite outer walls of two L-shaped side frames 102 via bearing seats, and a constant velocity chain drive pair 1104 for connecting the two bevel gear longitudinal shafts 1101. The bevel gear longitudinal shafts 1101 and the bevel gear vertical shafts 1102 mesh with each other. The upper end of one of the bevel gear vertical shafts 1102 is fixedly connected to the output shaft of the motor 12 via a coupling. A belt drive pair 110 is installed between the main conical roller shaft 91 and the bevel gear vertical shaft 1102. 3. The output shaft of motor 12 drives the vertical shaft of bevel gear 1102 to rotate, and the vertical shaft of bevel gear 1102 drives the longitudinal shaft of bevel gear 1101 meshing with it to rotate. At this time, the longitudinal shaft of bevel gear 1101 on the inner wall of another L-shaped side frame 102 obtains rotational power through the constant speed chain transmission pair 1104. Then, the speed adjustment components 9 on both sides obtain rotational power from the vertical shaft of bevel gear 1102 through the belt transmission pair 1103, so as to accurately distribute the power of the single motor 12 to the left and right sides, ensuring that the speed of each structure on both sides is consistent.

[0057] In practical use, the transmission ratio of the entire device can be adjusted by changing the bevel gear ratio, and the optimal operating speed range of motor 12 can be matched.

[0058] The side-position internal blower assembly 10 includes a cross-flow fan 1002 fixed on the inner wall of one side of the box liner 2, a tail shaft 1001 that rotates vertically on the outer wall of the L-shaped side frame 102, and a speed-increasing belt drive pair 1003 installed between the upper end of the tail shaft 1001 and the input shaft of the cross-flow fan 1002. A belt drive pair 1004 is installed between the lower end of the tail shaft 1001 and the auxiliary conical roller shaft 92.

[0059] The upper end of the secondary conical roller 92 drives the tail shaft 1001 to rotate through the belt drive pair 1004. The rotation speed of the tail shaft 1001 is amplified by the speed-increasing belt drive pair 1003 and then transmitted to the cross-flow fan 1002. When the cross-flow fan 1002 is working, it draws in the air near the inner wall of the box 2 and then blows it out in a direction parallel to the wall surface, forming a local internal circulation airflow. This re-stirs the air near the wall surface that is too cold or too humid, and mixes it with the mainstream hot air, so that the air in the entire box is constantly exchanged and the temperature and humidity field is more uniform.

[0060] A deflector can also be added to the air outlet of the cross-flow fan 1002 to change the air outlet direction.

[0061] Example 4, based on Example 3, by Figure 14 and Figure 15The enclosed air duct structure 4 includes a U-shaped perforated air duct 42 set inside the chamber 2, a main air duct 41 fixed on one side of the inner wall of the chamber 2, and several guide channels 43 connected between the main air duct 41 and the U-shaped perforated air duct 42. A secondary air duct 44 perpendicular to the door of the drying oven 1 is installed on one side of the inner wall of the U-shaped perforated air duct 42. A rotary joint 65 is installed at the bottom of the secondary air duct 44. The hot air generated by the electric heating blower assembly 5 first enters the main air duct 41, and then is diverted by the guide channels 43 into the U-shaped perforated air duct 42. The hot air is discharged through the air outlets on each pipe. At this time, the U-shaped perforated air duct 42 forms an enclosed shape, providing similar wind speed and temperature for the baked goods on the tray shelf 7, and improving the problem of uneven airflow caused by traditional single air ducts.

[0062] The electric heating blower assembly 5 includes a blower 52 installed at the top of the box liner 2, a rectangular shell 53 fixed to the air outlet of the blower 52, a sealed box 51 fixed to the back of the box liner 2 and connected to the main air duct 41, and an electric heating tube 55 installed inside the sealed box 51. An exhaust pipe 54 is installed between the rectangular shell 53 and the sealed box 51. The electric heating tube 55 in the sealed box 51 converts electrical energy into heat energy, causing the temperature in the sealed box 51 to rise rapidly. The blower 52 generates negative pressure to draw in the surrounding air. When the air flows over the surface of the electric heating tube 55, it is heated and becomes hot air. This part of the hot air is sent into the enclosed air duct structure 4 through the rectangular shell 53 and the exhaust pipe 54. During this process, the blower 52 can provide a high static pressure to overcome the air duct resistance and material layer resistance, ensuring that the hot air can penetrate the densely placed baked goods.

[0063] A cavity is provided between the uppermost U-shaped perforated air duct 42 and the top wall of the inner box 2. A hanging basket is slidably installed in the cavity along the width direction of the inner box 2. The baking capacity of the inner box is increased by sliding the hanging basket into the inner box 2.

[0064] Working principle: The baked goods to be dried are evenly placed on the tray racks 7 on both sides. Each rack should not be too densely packed to avoid stacking, ensuring that hot air effectively contacts the surface of each product. After placement, the operator connects the magnetic key shaft connecting assembly 8 to the lower end of the tray rack 7, ensuring a reliable torque transmission connection. Then, the door is closed and locked, creating a relatively sealed space inside the drying chamber 2. Parameters are set on the control panel 13 on the outer shell 1, including temperature setting, drying time, fan speed setting, and speed adjustment assembly 9. The rotation speed parameters are set according to the type of dried product. The target operating temperature of the electric heating blower assembly 5 is set, and the rotation speed of the motor 12 is set. The rotation speed of the motor 12 is directly proportional to the rotation speed of the tray shelf 7, the rotation speed of the following air duct structure 6, and the air volume of the side-mounted blower assembly 10. The speed regulation component 9 independently controls the rotation speed of the side-mounted blower assembly 10. After setting, the equipment is turned on. The electric heating blower assembly 5 heats the air and sends the hot air into the corresponding enclosed air duct structure 4. The enclosed air duct structure 4 guides the hot air into the interior of the chamber 2. Once the temperature stabilizes... The operator starts the motor 12, and the control panel 13 outputs power to the bevel gear double-position transmission assembly 11. The bevel gear double-position transmission assembly 11 transmits the power to the speed adjustment assemblies 9 on the left and right sides respectively. Each speed adjustment assembly 9 further divides the power, with one part driving the disc shelf 7 to rotate around the axis via the magnetic key shaft connection assembly 8, another part driving the following air duct structure 6 to rotate and deliver air, and a third part driving the side internal blower assembly 10. The baked goods on the disc shelf 7 begin to rotate slowly and uniformly, and the position and orientation of each baked good constantly change. The following air duct structure... The structure 6 rotates in the center of the chamber 2, sending hot air out from the central area to the surrounding areas, while the enclosed air duct structure 4 continuously sends air from the chamber wall. The side internal blower assembly 10 forms an internal circulation air zone near the inner wall of the chamber 2, drawing in and mixing the air near the wall before blowing it out. The speed adjustment assembly 9 allows the operator to fine-tune the speed of the side internal blower assembly 10 as needed during the drying process. When the set drying time is reached, the electric heating blower assembly 5 and motor 12 are turned off. After the temperature drops to a safe range, the chamber door is opened, and the dried baked goods on the tray rack 7 are transferred to the cooling area.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A forced-air drying oven for baking food, comprising an outer shell (1), a liner (2) installed inside the outer shell (1), partitions (101) disposed on the left and right sides of the liner (2), and a bottom box (3) fixed to the lower end of the liner (2), characterized in that, The drying oven shell (1) has at least two enclosed air duct structures (4) installed from top to bottom inside. The top of the inner chamber (2) is equipped with an electric heating blower assembly (5) connected to the air inlet of the enclosed air duct structure (4). The bottom left and right sides of the inner chamber (2) are respectively provided with disc-shaped shelves (7) that can rotate around their own axis. The bottom box (3) is equipped with a magnetic key shaft connection assembly (8) that is selectively powered to the disc-shaped shelves (7). A following air duct structure (6) is vertically arranged between the disc-shaped shelves (7) on the left and right sides. The air inlet of the following air duct structure (6) is connected to the air outlet of the uppermost enclosed air duct structure (4). The following air duct structure (6) and one of the magnetic key shaft connection assemblies (8) are powered to each other. Each compartment (101) is equipped with an L-shaped side frame (102), a portion of which extends horizontally into the bottom box (3). A speed adjustment assembly (9) is installed on one inner wall of the L-shaped side frame (102), and side-position internal blower assemblies (10) are provided on both the left and right inner walls of the drying chamber shell (1). A bevel gear double-position transmission assembly (11) is provided on the back of the drying chamber shell (1). The bevel gear double-position transmission assembly (11) is used to output power to the speed adjustment assemblies (9) on both sides. A motor (12) for driving the bevel gear double-position transmission assembly (11) is installed on the outer wall. The speed adjustment assembly (9) has two power output ends. One power output end drives the corresponding side disc shelf (7) to rotate through the magnetic key shaft connection assembly (8). The other power output end drives the side internal blower assembly (10) to operate. A control panel (13) is installed on one side of the surface of the drying oven shell (1). The output end of the control panel (13) is electrically connected to the electric heating blower assembly (5), the magnetic key shaft connection assembly (8), and the motor (12).

2. The forced-air drying oven for baked goods according to claim 1, characterized in that, The following type of air duct structure (6) includes a bearing seat (61), a hollow air duct (62), a convex shaft (63), and a constant velocity belt drive pair (64). The bearing seat (61) is fixed at the bottom of the box liner (2). The cam shaft (63) is vertically rotatably installed in the bearing seat (61) through a ball bearing. The hollow air duct (62) is fixed at the upper end of the cam shaft (63), and a rotary joint (65) is installed at the upper end of the hollow air duct (62). The rotary joint (65) is used to connect with the air outlet of the uppermost enclosed air duct structure (4). The constant speed belt drive pair (64) is set at the lower end of the cam shaft (63) and connected to one of the magnetic key shaft connection components (8).

3. The forced-air drying oven for baked goods according to claim 2, characterized in that, The disc shelf (7) includes a right-angled platform (6101) integrally formed on the top of the bearing seat (61), a bottom shaft (73) vertically rotatably mounted in the right-angled platform (6101) via bearings, a vertical shaft (71) coaxially fixed to the upper end of the bottom shaft (73), and a number of circular grid trays (72) installed at equal intervals along the axial direction of the vertical shaft (71). The lower end of the bottom shaft (73) is provided with a rectangular cavity (731).

4. A forced-air drying oven for baked goods according to claim 3, characterized in that, The magnetic key shaft connection assembly (8) includes a base (81), a shaft base (82), a steel plate (83), an electromagnet (85), an internal spline hollow shaft (86), and an external spline shaft (87). The base (81) is fixed to one side of the bottom of the base box (3), and the shaft (82) is fixed to the outer wall of the L-shaped side frame (102) near the following wind tunnel structure (6). The steel plate (83) is set between the shaft (82) and the base (81), and an elastic element (84) for connecting with the base (81) is installed at the corner of the bottom end of the steel plate (83). The inner spline hollow shaft (86) is rotatably installed on the upper end of the shaft (82), and the outer spline shaft (87) is coaxially sleeved. Inside the hollow inner spline shaft (86), the lower end of the outer spline shaft (87) passes through the shaft platform (82) and is rotatably connected to the steel plate (83). The upper end of the outer spline shaft (87) passes through the hollow inner spline shaft (86) and is integrally formed with a rectangular protrusion (89). The rectangular protrusion (89) and the rectangular cavity (731) are inserted into each other. The constant speed belt drive pair (64) is installed at the upper position of the hollow inner spline shaft (86) and enters the shaft seat (61) to connect with the cam shaft (63).

5. A forced-air drying oven for baked goods according to claim 4, characterized in that, The speed adjustment assembly (9) includes a main conical roller shaft (91) and a secondary conical roller shaft (92) vertically rotatably mounted on the outer wall of the L-shaped side frame (102) via bearing seats, and a transmission belt (93) mounted on the main conical roller shaft (91) and the secondary conical roller shaft (92). A belt drive pair (88) is installed between the lower end of the main conical roller shaft (91) and the inner spline hollow shaft (86). A C-shaped frame (94) is fixed on one side of the outer wall of the L-shaped side frame (102). The bottom of the C-shaped frame (94) The part is fixed with two vertical poles (98), and each pole (98) is fitted with a sleeve rod (96). Two clamping wheels (97) are rotatably installed on the opposite outer walls of the two sleeve rods (96). The two clamping wheels (97) are distributed on the upper and lower sides of the transmission belt (93). A connecting beam (961) is integrally formed between the two sleeve rods (96). A servo electric cylinder (95) is installed at the top of the C-shaped frame (94). The lower end of the output shaft of the servo electric cylinder (95) is fixedly connected to the upper end of the sleeve rod (96).

6. A forced-air drying oven for baked goods according to claim 5, characterized in that, The bevel gear dual-position transmission assembly (11) includes a bevel gear longitudinal shaft (1101) and a bevel gear vertical shaft (1102) rotatably mounted on the opposite outer walls of two L-shaped side frames (102) via bearing seats, and a constant velocity chain transmission pair (1104) for connecting the two bevel gear longitudinal shafts (1101). The bevel gear longitudinal shaft (1101) and the bevel gear vertical shaft (1102) mesh with each other. The upper end of one of the bevel gear vertical shafts (1102) is fixedly connected to the output shaft of the motor (12) via a coupling. A belt transmission pair (1103) is installed between the main conical roller shaft (91) and the bevel gear vertical shaft (1102).

7. A forced-air drying oven for baked goods according to claim 5, characterized in that, The side-position inner blower assembly (10) includes a cross-flow fan (1002) fixed on the inner wall of one side of the box (2), a tail shaft (1001) that rotates vertically on the outer wall of the L-shaped side frame (102), and a speed-increasing belt drive pair (1003) installed between the upper end of the tail shaft (1001) and the input shaft of the cross-flow fan (1002). A belt drive pair four (1004) is installed between the lower end of the tail shaft (1001) and the secondary conical roller shaft (92).

8. A forced-air drying oven for baked goods according to claim 2, characterized in that, The enclosed air duct structure (4) includes a U-shaped perforated air duct (42) set inside the box liner (2), a main air duct (41) fixed on one side of the inner wall of the box liner (2), and several guide channels (43) installed between the main air duct (41) and the U-shaped perforated air duct (42). A secondary air duct (44) perpendicular to the cabinet door of the drying oven shell (1) is installed on one side of the inner wall of the U-shaped perforated air duct (42). The rotary joint (65) is installed at the bottom of the secondary air duct (44).

9. A forced-air drying oven for baked goods according to claim 8, characterized in that, The electric heating blower assembly (5) includes a blower (52) installed at the top of the box (2), a rectangular shell (53) fixed on the air outlet of the blower (52), a sealing box (51) fixed on the back of the box (2) and connected to the main air duct (41), and an electric heating tube (55) installed inside the sealing box (51). An exhaust pipe (54) is installed between the rectangular shell (53) and the sealing box (51).

10. A forced-air drying oven for baked goods according to claim 8, characterized in that, A cavity is provided between the uppermost U-shaped perforated air duct (42) and the top wall of the box liner (2), and a hanging basket is slidably installed in the cavity along the width direction of the box liner (2).

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