Multi-layer efficient barbecue oven

Abstract

The invention belongs to the technical field of barbecue ovens, and particularly relates to a multi-layer efficient barbecue oven which comprises a bottom oven, a support, middle ovens and a baking tray cover, the support is installed on the lower side of the bottom oven, and at least one middle oven is installed between the bottom oven and the baking tray cover. According to the multi-layer efficient barbecue oven, the space can be efficiently utilized, the capacity can be improved, and the large capacity is suitable for a multi-person scene; the multi-layer oven can bake more food materials at the same time, is suitable for family parties or commercial activities, and avoids queuing waiting caused by insufficient space of a single-layer oven. Different food materials can be placed layer by layer, and meanwhile, the height position of the middle furnace is flexibly set according to the ripening speed; the layered structure can concentrate heat and reduce energy waste; the device can adapt to complex environments and cope with outdoor wind influence; the multi-layer structure blocks part of wind power, stabilizes the temperature in the oven, and avoids non-uniform fire of a single-layer oven caused by wind power; the device is suitable for outdoor catering activities, and efficiency and space utilization rate are both considered.

Description

Technical Field

[0001] This invention belongs to the field of barbecue oven technology, specifically relating to a multi-layer high-efficiency barbecue oven. Background Technology

[0002] Outdoor barbecues, as an activity that combines leisure, entertainment, and delicious food, are becoming increasingly popular.

[0003] Existing outdoor barbecue grills have several shortcomings. First, they lack tiered grilling capabilities, failing to meet the different temperature requirements of various ingredients, and their small capacity cannot accommodate large groups of diners at once. Second, the grill racks lack a rotating function, resulting in uneven grilling. Third, they do not automatically remove and remove food after cooking. Fourth, they do not automatically clean up the ash produced during grilling. Therefore, existing outdoor barbecue grills need to be optimized and improved. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems existing in the prior art and to provide a multi-layer high-efficiency barbecue oven.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: This invention provides a multi-layer high-efficiency barbecue grill, including a bottom oven, a support frame, an intermediate oven, and a baking tray cover. The support frame is installed on the lower side of the bottom oven, and at least one intermediate oven is installed between the bottom oven and the baking tray cover. The bottom oven includes an open-top oven, and the upper end of the open-top oven has a bottom oven slot for easy engagement with the intermediate oven. A central convex tube is fixed to the inner side of the bottom plate of the open-top oven. An air inlet is opened in the bottom plate of the open-top oven within the central convex tube. An air distribution plate and a flame distributor are installed in the inner cavity of the open-top oven. Several air guide holes are opened in the tube portion of the central convex tube below the air distribution plate. A rotating motor is installed in the upper inner cavity of the central convex tube through a heat insulation frame, and an active magnetic half-coupling is installed at the output end of the rotating motor.

[0006] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, the flame distributor includes an inner gas guide frame, a supporting outer frame, a gas supply pipe, a nozzle, and an igniter. The inner gas guide frame is sleeved and fixed on the outside of the central convex tube, and the supporting outer frame is fixed on the inner wall of the side plate of the open oven. Several gas supply pipes are supported together between the inner gas guide frame and the supporting outer frame, and several nozzles and igniters are provided on the upper side of the gas supply pipes.

[0007] Furthermore, in the aforementioned multi-layer high-efficiency barbecue grill, a liquefied petroleum gas (LPG) furnace is installed on the support frame, and the gas supply end of the LPG furnace is connected to the gas supply pipe of the flame distributor via a pipeline equipped with a gas furnace opening valve.

[0008] Furthermore, in the aforementioned multi-layer high-efficiency barbecue grill, the intermediate furnace includes an outer furnace tube, an inner furnace tube, and a connecting plate for connecting the two. The lower side of the outer furnace tube is provided with an intermediate furnace protrusion, and the upper side of the outer furnace tube is provided with an intermediate furnace slot. The intermediate furnace protrusion cooperates with the bottom furnace slot or the intermediate furnace slot. A gear box is fixed inside the inner cavity of the inner furnace tube. A hollow drive shaft passes vertically through the gear box. Hollow driven magnetic half-couplings are installed at both ends of the hollow drive shaft. A combined barbecue rack, driven by the hollow drive shaft, is symmetrically installed on both sides of the inner furnace tube. A receiving basket is symmetrically installed on the lower part of both side walls of the outer furnace tube. Pushing components for automatically pushing food from the combined barbecue rack into the receiving basket are symmetrically installed on both sides of the inner furnace tube. Windows are symmetrically opened on both sides of the outer furnace tube. A sliding cover with a handle is installed at the window of the outer furnace tube. The sliding cover is made of high-temperature resistant glass material, and rollers are installed at the bottom end of the sliding cover.

[0009] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, a flue gas gap is left between the active magnetic half-coupling and the driven magnetic half-coupling connected to it. When there are two or more intermediate ovens, a flue gas gap is also left between the two connected driven magnetic half-couplings. The upper part of the inner oven tube is provided with several flue gas guide holes near the driven magnetic half-coupling.

[0010] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, the combined barbecue rack includes a driven shaft, a driven bevel gear, a turntable, an anti-detachment ring, and needle rods. The driven shaft passes through both the gear box and the inner oven tube. A driven bevel gear is fixed to one end of the driven shaft inside the gear box, and a turntable is fixed to the other end of the driven shaft outside the inner oven tube. An anti-detachment ring with a T-shaped cross-section is installed on the inner side of the turntable, and several needle rods are evenly distributed on the outer side of the turntable. A driving bevel gear that meshes with two driven bevel gears is installed on the outer side of the hollow drive shaft inside the gear box.

[0011] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, the feeding assembly includes a lead screw motor, a lead screw, a pusher plate, and a movable disc. The lead screw motor is fixed to the inner wall of the inner furnace tube, and the output end of the lead screw motor is connected to a lead screw. The lead screw is supported for rotation by both the outer and inner furnace tubes. A pusher plate is fitted around the outside of the lead screw, and a rotating groove is provided at the bottom of the pusher plate. The movable disc is movably restricted in the rotating groove. The central axis of the movable disc coincides with the central axis of the driven shaft in the corresponding combined barbecue rack. Several through holes are provided on the movable disc to facilitate the passage of the needle rod in the corresponding combined barbecue rack.

[0012] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, the baking pan cover includes an outer support tube, an inner support block, and a stainless steel heat-conducting plate connected between the two. The upper side of the stainless steel heat-conducting plate is provided with a non-stick ceramic coating, the lower side of the outer support tube is provided with a baking pan cover protrusion that mates with the central oven slot, and the center of the inner support block is provided with a smoke exhaust hole.

[0013] Furthermore, in the above-mentioned multi-layer high-efficiency barbecue oven, the method for preparing the non-stick ceramic coating includes the following steps: S1. Mix 25-40 parts of silica sol, 2-4 parts of aluminum nitride, 4-10 parts of ceramic filler, 8-12 parts of pigment, and 0.5-1.5 parts of nano-yttrium oxide, grind until the fineness is below 10 μm, add 5-10 parts of zirconium sol and mix evenly to obtain component A; the particle size of silica sol is 10-15 nm, and the particle size of aluminum nitride and ceramic filler is 3-8 μm; S2. Mix 25-35 parts of vinyltrimethoxysilane, 4-6 parts of methyltriethoxysilane, 3-6 parts of fluorinated silane, 3-6 parts of polycarbosilane, and 0.05-0.2 parts of citric acid evenly to obtain component B. S3. Mix component A and component B at a mass ratio of 1 to 1.5:1, and roll them on a roller at a speed of 150 to 170 rpm for 2 to 4 hours to obtain a mixed paint. S4. Spray the mixed paint onto the preheated stainless steel heat-conducting plate surface, and heat and cure it at 220-250℃ for 15-25 minutes to form a non-stick ceramic coating on the stainless steel heat-conducting plate surface.

[0014] Furthermore, in the aforementioned multi-layer high-efficiency barbecue oven, a battery and a controller are installed on the support frame, and temperature sensors are installed inside the bottom oven and the intermediate oven. The controller is connected to the tilting motor, the lead screw motor, the gas furnace opening valve, the temperature sensor, the igniter, and the battery, respectively.

[0015] The beneficial effects of this invention are: 1. The multi-layer high-efficiency barbecue oven provided by this invention can make efficient use of space and increase capacity, and its large capacity is suitable for multi-person scenarios; the multi-layer oven can bake more food at the same time, which is suitable for family gatherings or business activities, and avoids queuing due to insufficient space in single-layer ovens.

[0016] 2. The multi-layer high-efficiency barbecue oven provided by the present invention can cook in layers and categories. Different ingredients (such as meat, vegetables and seafood) can be placed in layers. At the same time, the height position of the middle oven can be flexibly set according to the aging speed. For example, the upper layer can slowly roast thick-cut steaks, and the lower layer can quickly roast vegetables.

[0017] 3. The multi-layer high-efficiency barbecue oven provided by this invention can reduce energy waste. The layered structure can concentrate heat, and compared with a single-layer oven, it can bake more food per unit time and reduce energy consumption.

[0018] 4. The multi-layer high-efficiency barbecue grill provided by this invention can adapt to complex environments and cope with the effects of outdoor wind; the multi-layer structure blocks part of the wind force, stabilizes the temperature inside the grill, and avoids uneven heat distribution caused by wind in a single-layer grill. It is suitable for outdoor catering activities, balancing efficiency and space utilization.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom furnace structure in this invention; Figure 3 This is a schematic diagram of the support structure in this invention; Figure 4 This is a schematic diagram of the intermediate furnace in this invention; Figure 5 This is a schematic diagram showing the installation position of the combined barbecue grill in this invention; Figure 6 This is a schematic diagram of the combined barbecue grill at one angle in this invention; Figure 7 This is a schematic diagram of the combined barbecue grill from another angle in the present invention; Figure 8 This is a schematic diagram of the material pushing component in this invention; Figure 9 This is a schematic diagram of the installation of the sliding cover in this invention; Figure 10 This is a schematic diagram of the structure of the baking pan lid in this invention; Figure 11 This is a connection block diagram of the main electrical components in this invention; In the attached diagram, the components represented by each number are as follows: 1-Bottom furnace, 101-Opening furnace, 102-Bottom furnace slot, 103-Central convex tube, 104-Air inlet, 105-Air guide hole, 106-Air distribution plate, 107-Inner gas guide frame, 108-Outer support frame, 109-Gas supply pipe, 110-Nozzle, 111-Igniter, 112-Heat insulation frame, 113-Tilting motor, 114-Active magnetic half-coupling, 2-Bracket, 3-Intermediate furnace, 301-Outer furnace tube, 302-Inner furnace tube, 303-Gear box, 304-Hollow drive shaft, 305-Driven magnetic half-coupling, 306-Active bevel gear, 307-Driven shaft, 308-Driven... 309-Turntable, 310-Anti-detachment ring, 311-Needle rod, 312-Screw motor, 313-Screw, 314-Push plate, 315-Moving disc, 316-Flue gas vent, 317-Intermediate furnace protruding plate, 318-Intermediate furnace slot, 319-Window, 320-Sliding cover, 321-Handle, 322-Receiving basket, 4-Baking tray cover, 401-Outer support tube, 402-Inner support block, 403-Stainless steel heat-conducting plate, 404-Non-stick ceramic coating, 405-Baking tray cover protruding plate, 406-Flue gas vent, 5-Liquefied gas furnace, 6-Gas furnace opening valve, 7-Battery, 8-Controller. Detailed Implementation

[0022] 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.

[0023] like Figure 1 As shown, this embodiment provides a multi-layer high-efficiency barbecue grill, including a bottom oven 1, a support 2, an intermediate oven 3, and a baking tray cover 4. The support 2 is installed on the lower side of the bottom oven 1, and at least one intermediate oven 3 is installed between the bottom oven 1 and the baking tray cover 4.

[0024] like Figure 2 As shown, the bottom furnace 1 includes an open-hearth furnace 101. The upper end of the open-hearth furnace 101 has an inwardly opening bottom furnace slot 102 for easy connection to the intermediate furnace 3. A central convex tube 103 is fixed to the inner side of the bottom plate of the open-hearth furnace 101. An air inlet 104 is opened in the bottom plate of the open-hearth furnace 101 within the central convex tube 103. An air distribution plate 106 and a flame distributor located above it are installed in the inner cavity of the open-hearth furnace 101. Several air guide holes 105 are opened in the tube portion of the central convex tube 103 below the air distribution plate 106. A tilting motor 113 is installed in the upper inner cavity of the central convex tube 103 via a heat insulation frame 112. An active magnetic half-coupling 114 is installed at the output end of the tilting motor 113.

[0025] In this embodiment, the igniter includes an inner gas guide frame 107, a supporting outer frame 108, gas supply pipes 109, nozzles 110, and an igniter. The inner gas guide frame 107 is sleeved and fixed on the outside of the central convex tube 103, and the supporting outer frame 108 is fixed to the inner wall of the side plate of the open furnace 101. Several gas supply pipes 109 are supported together between the inner gas guide frame 107 and the supporting outer frame 108. Several nozzles 110 and an igniter 111 for ignition are arranged on the upper side of the gas supply pipes 109.

[0026] In this embodiment, a liquefied gas furnace 5 is installed on the bracket 2, and the gas supply end of the liquefied gas furnace 5 is connected to the gas supply pipe 109 of the igniter via a pipeline equipped with a gas furnace opening valve 6.

[0027] like Figures 4-5 As shown, the intermediate furnace 3 includes an outer furnace tube 301, an inner furnace tube 302, and a connecting plate for connecting the two. An intermediate furnace protrusion 317 is provided on the lower side of the outer furnace tube 301, and an intermediate furnace slot 318 is provided on the upper side of the outer furnace tube 301. The intermediate furnace protrusion 317 cooperates with either the bottom furnace slot 102 or the intermediate furnace slot 318. A gear box 303 is fixed inside the inner cavity of the inner furnace tube 302. A hollow drive shaft 304 is vertically inserted through the gear box 303, and hollow driven magnetic half-couplings 305 are installed at both ends of the hollow drive shaft 304. A combined barbecue rack, driven by the hollow drive shaft 304, is symmetrically installed on both sides of the inner furnace tube 302. A receiving basket 322 is symmetrically installed on the lower part of both side walls of the outer furnace tube 301. A pushing assembly for automatically pushing food from the combined barbecue rack into the receiving basket 322 is symmetrically installed on both sides of the inner furnace tube 302. The outer furnace tube 301 has symmetrically arranged windows 319 on both sides. A sliding cover 320 with a handle 321 is installed at each window 319 on the outer furnace tube 301. The sliding cover 320 is made of high-temperature resistant glass material, and a roller is installed at the bottom of the sliding cover 320. A storage groove is provided on the side wall of the window 319 to facilitate the movement of the sliding cover 320 and the roller. Figure 9 As shown.

[0028] In this embodiment, a flue gas gap is left between the active magnetic half-coupling 114 and the driven magnetic half-coupling 305 that is connected to it. When there are two or more intermediate furnaces 3, a flue gas gap is also left between the two driven magnetic half-couplings 305 that are connected to each other. The upper part of the inner furnace tube 302 is provided with several flue gas guide holes 316 near the driven magnetic half-coupling 305.

[0029] like Figures 6-7As shown, the combined barbecue grill includes a driven shaft 307, a driven bevel gear 308, a turntable 309, an anti-detachment ring 310, and needle bars 311. The driven shaft 307 passes through both the gear box 303 and the inner oven tube 302. The driven bevel gear 308 is fixed to one end of the driven shaft 307 inside the gear box 303. The turntable 309 is fixed to the other end of the driven shaft 307 outside the inner oven tube 302. A T-shaped anti-detachment ring 310 is installed on the inner side of the turntable 309. Several needle bars 311 for threading food to be grilled are evenly distributed on the outer side of the turntable 309.

[0030] In this embodiment, the hollow drive shaft 304 is located inside the gear box 303, and a driving bevel gear 306 is installed on the outer side of the shaft body, which meshes with the two driven bevel gears 308 simultaneously. An annular anti-detachment groove is provided in the inner furnace tube 302 to cooperate with the anti-detachment ring 310. The inner furnace tube 302 and the central convex tube 103 are rectangular tube structures.

[0031] like Figure 8 As shown, the feeding assembly includes a lead screw motor 312, a lead screw 313, a pusher plate 314, and a movable disc 315. The lead screw motor 312 is fixed to the inner wall of the inner furnace tube 302, and the output end of the lead screw motor 312 is connected to the lead screw 313. The lead screw 313 is supported for rotation by both the outer furnace tube 301 and the inner furnace tube 302. The outer side of the lead screw 313 is fitted with a pusher plate 314 that mates with it. The lower part of the pusher plate 314 has a rotating groove, in which the movable disc 315 is movably restricted. The central axis of the movable disc 315 coincides with the central axis of the driven shaft 307 in the corresponding combined barbecue rack. The movable disc 315 has several through holes to facilitate the passage of the needle rod 311 in the corresponding combined barbecue rack.

[0032] like Figure 10 As shown, the baking pan cover 4 includes an outer support tube 401, an inner support block 402, and a stainless steel heat-conducting plate 403 connecting the two. The upper side of the stainless steel heat-conducting plate 403 is provided with a non-stick ceramic coating 404. The lower side of the outer support tube 401 is provided with a baking pan cover protrusion 405 that mates with the intermediate oven slot 318. A smoke exhaust hole 406 is opened at the center of the inner support block 402.

[0033] In this embodiment, the method for preparing the non-stick ceramic coating includes the following steps: S1. Mix 25-40 parts of silica sol, 2-4 parts of aluminum nitride, 4-10 parts of ceramic filler, 8-12 parts of pigment, and 0.5-1.5 parts of nano-yttrium oxide, grind until the fineness is below 10 μm, add 5-10 parts of zirconium sol and mix evenly to obtain component A; the particle size of silica sol is 10-15 nm, and the particle size of aluminum nitride and ceramic filler is 3-8 μm; S2. Mix 25-35 parts of vinyltrimethoxysilane, 4-6 parts of methyltriethoxysilane, 3-6 parts of fluorinated silane, 3-6 parts of polycarbosilane, and 0.05-0.2 parts of citric acid evenly to obtain component B. S3. Mix component A and component B at a mass ratio of 1 to 1.5:1, and roll them on a roller at a speed of 150 to 170 rpm for 2 to 4 hours to obtain a mixed paint. S4. Spray the mixed paint onto the preheated stainless steel heat-conducting plate surface, and heat and cure it at 220-250℃ for 15-25 minutes to form a non-stick ceramic coating on the stainless steel heat-conducting plate surface.

[0034] In this embodiment, a battery 7 and a controller 8 are installed on the bracket 2. Temperature sensors are installed inside the bottom furnace 1 and the intermediate furnace 3. The controller 8 is connected to the tilting motor 113, the lead screw motor 312, the gas furnace opening valve 6, the temperature sensors, the igniter 111, and the battery 7, respectively. Figure 11 As shown.

[0035] In this embodiment, the intermediate oven 3 is located on the outside of each window 319 and can be equipped with operation buttons and indicator lights. The operation buttons and indicator lights are connected to the controller 8. The grilling time for the food is set by the operation buttons. When the grilling time is over, the controller 8 drives the lead screw motor 312 of the corresponding pushing component to work, automatically pushing the grilled food into the receiving basket 322, and at the same time, the indicator light is turned on to indicate that the grilling is over.

[0036] The working principle of this embodiment is as follows: A magnetic coupling is formed by an active magnetic half-coupling 114 and a driven magnetic half-coupling 305. This magnetic coupling transmits the torque of the flipping motor 113 to the hollow drive shaft 304. The hollow drive shaft 304 drives the combined grill rack to flip via a steering gear set composed of an active bevel gear 306 and a driven bevel gear 308. The food pierced by the needle rod 311 on the combined grill rack also flips, achieving uniform grilling. When there are two or more intermediate ovens 3, the driven magnetic half-couplings 305 in the two intermediate ovens 3, which are close to each other, also form a magnetic coupling. Although using multiple magnetic couplings together will cause some torque loss, it can still meet the flipping requirements. The structural design of the magnetic coupling is mainly based on two advantages: first, it makes the intermediate oven 3 an independent module that can be added or removed as needed; second, the hollow structure of the magnetic coupling with its clearance fit allows for the smooth exhaust of flue gas.

[0037] This multi-layer high-efficiency barbecue grill efficiently utilizes space and increases capacity, with a large capacity suitable for multi-person scenarios. The multi-layer design allows for simultaneous grilling of more food, ideal for family gatherings or business events, avoiding the long queues caused by insufficient space in single-layer grills. This multi-layer high-efficiency barbecue grill allows for layered and categorized cooking; different ingredients (such as meat, vegetables, and seafood) can be placed on separate layers, and their height within the central compartment can be flexibly adjusted according to their cooking speed. For example, thick-cut steaks can be slowly grilled on the upper layer, while vegetables are quickly grilled on the lower layer. This multi-layer high-efficiency barbecue grill reduces energy waste; the layered structure concentrates heat, allowing for grilling more food per unit time compared to a single-layer grill, thus reducing energy consumption. This multi-layer high-efficiency barbecue grill is adaptable to complex environments and can withstand outdoor wind; the multi-layered structure blocks some wind, stabilizing the internal temperature and avoiding the uneven heat distribution caused by wind in single-layer grills. It is suitable for outdoor catering activities, balancing efficiency and space utilization.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer high-efficiency barbecue grill, characterized in that, The system includes a bottom oven, a support frame, an intermediate oven, and a baking tray cover. The support frame is installed on the lower side of the bottom oven, and at least one intermediate oven is installed between the bottom oven and the baking tray cover. The bottom oven includes an open-top oven with a bottom oven slot at its upper end for easy engagement with the intermediate oven. A central convex tube is fixed to the inner side of the bottom plate of the open-top oven. An air inlet is provided in the bottom plate of the open-top oven within the central convex tube. An air distribution plate and a flame distributor are installed in the inner cavity of the open-top oven. Several air guide holes are provided in the tube portion of the central convex tube below the air distribution plate. A rotating motor is installed in the upper inner cavity of the central convex tube via a heat insulation frame, and an active magnetic half-coupling is installed at the output end of the rotating motor.

2. The multi-layer high-efficiency barbecue grill according to claim 1, characterized in that, The igniter includes an inner gas guide frame, an outer support frame, a gas supply pipe, a nozzle, and an igniter. The inner gas guide frame is sleeved and fixed on the outside of the central convex tube. The outer support frame is fixed to the inner wall of the side plate of the open furnace. Several gas supply pipes are supported between the inner gas guide frame and the outer support frame. Several nozzles and igniters are provided on the upper side of the gas supply pipes.

3. The multi-layer high-efficiency barbecue oven according to claim 2, characterized in that, A liquefied petroleum gas (LPG) furnace is installed on the support frame, and the gas supply end of the LPG furnace is connected to the gas supply pipe of the igniter via a pipeline equipped with a gas furnace opening valve.

4. The multi-layer high-efficiency barbecue oven according to claim 3, characterized in that, The intermediate furnace includes an outer furnace tube, an inner furnace tube, and a connecting plate for connecting the two. The lower side of the outer furnace tube has an intermediate furnace protrusion, and the upper side has an intermediate furnace slot. The intermediate furnace protrusion cooperates with the bottom furnace slot or the intermediate furnace slot. A gear box is fixed inside the inner furnace tube, and a hollow drive shaft passes vertically through the gear box. Hollow driven magnetic half-couplings are installed at both ends of the hollow drive shaft. A combined barbecue rack, driven by the hollow drive shaft, is symmetrically installed on both sides of the inner furnace tube. A receiving basket is symmetrically installed on the lower part of both side walls of the outer furnace tube. Pushing components for automatically pushing food from the combined barbecue rack into the receiving basket are symmetrically installed on both sides of the inner furnace tube. Windows are symmetrically opened on both sides of the outer furnace tube, and a sliding cover with a handle is installed at each window. The sliding cover is made of high-temperature resistant glass, and rollers are installed at the bottom of the sliding cover.

5. The multi-layer high-efficiency barbecue grill according to claim 4, characterized in that, A flue gas gap is left between the active magnetic half-coupling and the driven magnetic half-coupling connected to it. When there are two or more intermediate furnaces, a flue gas gap is also left between the two driven magnetic half-couplings connected to each other. Several flue gas guide holes are opened in the upper part of the inner furnace tube near the driven magnetic half-coupling.

6. The multi-layer high-efficiency barbecue grill according to claim 5, characterized in that, The combined barbecue grill includes a driven shaft, a driven bevel gear, a turntable, an anti-detachment ring, and needle rods. The driven shaft passes through both the gear box and the inner oven tube. The driven bevel gear is fixed to one end of the driven shaft inside the gear box, and the turntable is fixed to the other end of the driven shaft outside the inner oven tube. An anti-detachment ring with a T-shaped cross-section is installed on the inner side of the turntable, and several needle rods are evenly distributed on the outer side of the turntable. The hollow drive shaft is equipped with a driving bevel gear that meshes with the two driven bevel gears simultaneously on the outer side of the shaft body inside the gear box.

7. The multi-layer high-efficiency barbecue grill according to claim 6, characterized in that, The feeding assembly includes a lead screw motor, a lead screw, a push plate, and a movable disc. The lead screw motor is fixed to the inner wall of the inner furnace tube. The output end of the lead screw motor is connected to the lead screw. The lead screw is supported by the outer furnace tube and the inner furnace tube for rotation. A push plate is fitted on the outer side of the lead screw. A rotating groove is provided at the lower part of the push plate. The movable disc is movably restricted in the rotating groove. The central axis of the movable disc coincides with the central axis of the driven shaft in the corresponding combined barbecue rack. Several through holes are provided on the movable disc to facilitate the passage of the needle rod in the corresponding combined barbecue rack.

8. The multi-layer high-efficiency barbecue oven according to claim 7, characterized in that, The baking pan cover includes an outer support tube, an inner support block, and a stainless steel heat-conducting plate connected between the two. The upper side of the stainless steel heat-conducting plate is provided with a non-stick ceramic coating. The lower side of the outer support tube is provided with a baking pan cover protrusion that mates with the intermediate oven slot. The center of the inner support block is provided with a flue gas vent.

9. The multi-layer high-efficiency barbecue grill according to claim 8, characterized in that, The method for preparing the non-stick ceramic coating includes the following steps: S1. Mix 25-40 parts of silica sol, 2-4 parts of aluminum nitride, 4-10 parts of ceramic filler, 8-12 parts of pigment, and 0.5-1.5 parts of nano-yttrium oxide, grind until the fineness is below 10 μm, add 5-10 parts of zirconium sol and mix evenly to obtain component A; the particle size of silica sol is 10-15 nm, and the particle size of aluminum nitride and ceramic filler is 3-8 μm; S2. Mix 25-35 parts of vinyltrimethoxysilane, 4-6 parts of methyltriethoxysilane, 3-6 parts of fluorinated silane, 3-6 parts of polycarbosilane, and 0.05-0.2 parts of citric acid evenly to obtain component B. S3. Mix component A and component B at a mass ratio of 1 to 1.5:1, and roll them on a roller at a speed of 150 to 170 rpm for 2 to 4 hours to obtain a mixed paint. S4. Spray the mixed paint onto the preheated stainless steel heat-conducting plate surface, and heat and cure it at 220-250℃ for 15-25 minutes to form a non-stick ceramic coating on the stainless steel heat-conducting plate surface.

10. The multi-layer high-efficiency barbecue oven according to claim 9, characterized in that, The bracket is equipped with a battery and a controller. Temperature sensors are installed inside the bottom furnace and intermediate furnace. The controller is connected to the tilting motor, the lead screw motor, the gas furnace opening valve, the temperature sensor, the igniter, and the battery, respectively.

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