CN114982794B - Double-layer circulating tunnel furnace convenient for mixing and baking different foods - Google Patents

Abstract

The invention relates to the technical field of tunnel furnaces, in particular to a double-layer circulating tunnel furnace convenient for mixing and baking different foods, which comprises a furnace body, a carrying box, a transfer device, an in-out conversion device and a controller; the furnace body is formed by connecting at least two unit devices in series end to end, each unit device comprises a unit shell, and the inside of the unit shell is divided into an upper rail and a lower rail from top to bottom. The tunnel oven designed by the invention can circularly bake food in the tunnel oven, so that the baking time does not depend on the length of the oven body of the tunnel oven, the phenomenon that newly added carrying boxes and carrying boxes needing to be recycled are mutually overlapped and clamped can be avoided between the carrying boxes, different types of food needing to be baked for different durations can be effectively baked at the same time, the baking effect cannot be influenced due to the fact that the length of the oven body can be freely assembled and customized through unit devices according to the size of a field in a factory, and the tunnel oven is more convenient to use in a small field.

Description

Double-layer circulating tunnel furnace convenient for mixing and baking different foods

Technical Field

The invention relates to the technical field of tunnel furnaces, in particular to a double-layer circulating tunnel furnace convenient for mixed baking of different foods.

Background

Tunnel ovens are devices that bake food items located therein by conduction, convection, radiation, and the like, and are widely used in the food industry due to their advantages of continuous production, high production efficiency, stable baking quality, labor conservation, and the like. However, the existing tunnel furnace is mainly a single-layer furnace body which cannot work circularly, so that the furnace body of the tunnel furnace needs to be arranged very long, and the area of a field in a factory is very occupied. In addition, the tunnel furnaces can only provide one baking time length at the same time due to the fact that one end enters the other end, and food which needs the same baking temperature but has different baking time lengths cannot be processed in the same tunnel furnace at the same time, so that the production line needs to be adjusted frequently when different baked food needs to be produced in a factory or the production line needs to be staggered; or multiple tunnel furnaces but with greater plant space and equipment costs.

If the novel tunnel furnace is small in occupied area and capable of circularly baking, so that foods needing different baking times can be processed simultaneously, the problems can be solved, and the double-layer circulating tunnel furnace convenient for mixed baking of different foods is provided.

Disclosure of Invention

The invention aims to provide a double-layer circulating tunnel furnace convenient for mixing and baking different foods so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a double-deck circulating tunnel furnace convenient to different food mixes toasts, this tunnel furnace includes:

the furnace body is formed by connecting at least two unit devices in series end to end, each unit device comprises a unit shell, and the interior of the unit shell is divided into an upper track and a lower track from top to bottom;

the carrying box can slide along the upper rail or the lower rail and comprises a box body for containing food, an identification code is arranged above the box body, racks are symmetrically arranged on the left side and the right side of the box body, main motors are arranged at the upper end and the lower end of the unit shell, and the output ends of the main motors are respectively provided with two groups of main gears meshed with the racks corresponding to the upper rail and the lower rail;

the transfer device is arranged at the tail end of the furnace body and comprises a transfer shell, a first lifting push rod is fixedly mounted on the transfer shell, a first lifting plate which can be aligned with the upper rail or the lower rail is driven by the tail end of the first lifting push rod, a first driving motor is fixedly mounted on the first lifting plate, and a first gear meshed with the rack is driven by the output end of the first driving motor;

the feeding and discharging conversion device comprises a main shell arranged at the head end of a furnace body, a feeding track for facilitating food to enter is fixed on the main shell at a position corresponding to the upper track, a second lifting plate is arranged in the main shell at a position corresponding to the feeding track, an identification code detector for detecting an identification code is fixedly arranged on the second lifting plate, a discharging track for facilitating food to discharge is fixed on the main shell at a position corresponding to the lower track, a third lifting plate is arranged on the main shell at a position corresponding to the discharging track, a second lifting push rod is fixedly arranged on the main shell, the driving end of the second lifting push rod is used for controlling the second lifting plate and the third lifting plate to lift together, a second driving motor is fixedly arranged on the second lifting plate and the third lifting plate, a second gear meshed with a rack is driven on the second driving motor, a third driving motor is fixedly arranged on the feeding track and the discharging track, and a third gear meshed with the rack is driven on the third driving motor;

the controller is fixedly installed on the main shell, the controller is respectively electrically connected with the main motor, the first driving motor, the second driving motor, the third driving motor, the first lifting push rod and the second lifting push rod through cables, a first in-place sensor used for detecting whether the carrying box is in place is fixedly installed on the first lifting plate, a second in-place sensor used for detecting whether the carrying box is in place is fixedly installed on the second lifting plate, a third in-place sensor used for detecting whether the carrying box is in place is fixedly installed on the third lifting plate, and the first in-place sensor, the second in-place sensor and the third in-place sensor are electrically connected with the controller through cables.

Preferably, the box body is provided with rollers, and the upper rail and the lower rail are respectively provided with a guide plate for guiding the carrying box to move.

Preferably, the main motor, the first driving motor, the second driving motor and the third driving motor are all stepping motors, the controller is a PLC controller, and the first lifting push rod and the second lifting push rod are all electric push rods.

Preferably, fixed mounting has the second to seal the push rod on the main casing body, and the output drive that the push rod was sealed to the second has the last closed valve that is used for sealing the feeding track end, fixed mounting has first closed push rod on the main casing body, and the output drive of first closed push rod has the lower closed valve that is used for sealing row material track, first closed push rod and second closed push rod are the electric putter with controller electric connection.

Preferably, the unit housing is provided with a docking seat for conveniently installing an additional function device, and the additional function device is one or more of a transparent observation window, a moisture absorption cotton or a camera.

Preferably, the unit shell is provided with a flow guide pipe and a recovery pipe at the left end and the right end corresponding to the upper track and the lower track respectively, the tail end of the recovery pipe is fixedly provided with a fan, the output end of the fan is fixedly provided with a return pipe, the return pipe is communicated with a discharge pipe, the discharge pipe is fixedly provided with a discharge valve, the return pipe is communicated with the flow guide pipe, the return pipe is provided with a return valve, the flow guide pipe is communicated with an external air supply device through an air inlet pipe, the air inlet pipe is fixedly provided with an air inlet valve, the unit shell is fixedly provided with temperature detection sensors at the positions corresponding to the upper track and the lower track, and the temperature detection sensors, the fan, the air inlet valve, the return valve and the discharge valve are all electrically connected with the controller through cables.

Compared with the prior art, the invention has the beneficial effects that:

the tunnel oven designed by the invention can circularly bake food in the tunnel oven, so that the baking time does not depend on the length of the oven body of the tunnel oven, the phenomenon that newly added carrying boxes and carrying boxes needing to be recycled are mutually overlapped and clamped can be avoided between the carrying boxes, different types of food needing to be baked for different time lengths can be effectively baked simultaneously, the baking effect cannot be influenced due to the fact that the length of the oven body can be freely assembled and customized through unit devices according to the size of a field in a factory, and the tunnel oven is more convenient to use in a small field, and has high practical value.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a single unit device according to the present invention;

FIG. 3 is a schematic view of the construction of the carrier box of the present invention;

FIG. 4 is a schematic view of the transfer device of the present invention;

fig. 5 is a schematic structural diagram of the in-out switching device of the present invention.

In the figure: 1. a second drive motor; 2. a carrying box; 201. a roller; 202. a rack; 203. a box body; 204. an identification code; 3. a transfer device; 301. a transfer housing; 302. a first lifting push rod; 303. a first gear; 304. a first drive motor; 305. a first in-position sensor; 306. a first lifter plate; 4. an in-out switching device; 401. a main housing; 402. a second lifting push rod; 403. a second lifter plate; 404. a third drive motor; 405. a feed track; 406. a discharge track; 407. a third lifter plate; 408. a third gear; 5. a unit device; 501. a lower rail; 502. an upper rail; 503. a main gear; 504. a unit case; 505. a main motor; 6. a guide plate; 7. a docking station; 8. an additional function device; 9. an air inlet pipe; 10. an air inlet valve; 11. a return flow valve; 12. a return pipe; 13. a drain pipe; 14. an exhaust valve; 15. a fan; 16. a recovery pipe; 17. a lower closing valve; 18. a first closing push rod; 19. an upper closing valve; 20. a second closing push rod; 21. a flow guide pipe; 22. a second gear; 23. a second in-position sensor; 24. an identification code detector; 25. a third in-position sensor; 26. a controller; 27. and a temperature detection sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 5, the present invention provides a technical solution: the utility model provides a circulating tunnel furnace of double-deck convenient to different food mixes toasts, this tunnel furnace includes:

referring to fig. 1, the furnace body is composed of at least two unit devices 5 connected in series end to end, and each unit device 5 comprises a unit shell 504, the inside of the unit shell 504 is divided into an upper track 502 and a lower track 501 from top to bottom;

referring to fig. 2 and 3, the carrier box 2 can slide along an upper rail 502 or a lower rail 501, the carrier box 2 includes a box body 203 for holding food, an identification code 204 is disposed above the box body 203, racks 202 are symmetrically disposed on left and right sides of the box body 203, main motors 505 are mounted on upper and lower ends of a unit housing 504, two sets of main gears 503 engaged with the racks 202 are disposed at output ends of the main motors 505 corresponding to the upper rail 502 and the lower rail 501, rollers 201 are mounted on the box body 203, and guide plates 6 for guiding the carrier box 2 to move are mounted on the upper rail 502 and the lower rail 501;

referring to fig. 1 and 4, the transfer device 3 is disposed at the end of the furnace body, the transfer device 3 includes a transfer housing 301, a first lifting push rod 302 is fixedly mounted on the transfer housing 301, a first lifting plate 306 capable of aligning with the upper rail 502 or the lower rail 501 is driven by the end of the first lifting push rod 302, a first driving motor 304 is fixedly mounted on the first lifting plate 306, and a first gear 303 engaged with the rack 202 is driven by the output end of the first driving motor 304;

in-out switching device 4, please refer to fig. 1 and 5, in-out switching device 4 includes a main housing 401 installed at the head end of the furnace body, and a feeding track 405 facilitating food entering is fixed at a position corresponding to upper track 502 on main housing 401, a second lifting plate 403 is arranged at a position corresponding to feeding track 405 in main housing 401, and an identification code detector 24 for detecting identification code 204 is fixedly installed on second lifting plate 403, a discharging track 406 facilitating food discharging is fixed at a position corresponding to lower track 501 on main housing 401, and a third lifting plate 407 is arranged at a position corresponding to discharging track 406 on main housing 401, a second lifting push rod 402 is fixedly installed on main housing 401, and a driving end of second lifting push rod 402 is used for controlling second lifting plate and third lifting plate 407 to lift together, a second driving motor 1 is fixedly installed on second lifting plate 403 and third lifting plate 407, and a second gear 22 engaged with rack 202 is driven on second driving motor 1, and third driving motor 404 is fixedly installed on feeding track 405 and discharging track 406, and a third driving gear 408 engaged with rack 202 is driven on third driving motor 404;

a second sealing push rod 20 is fixedly installed on the main shell 401, an upper sealing valve 19 used for sealing the tail end of the feeding track 405 is driven by the output end of the second sealing push rod 20, a first sealing push rod 18 is fixedly installed on the main shell 401, a lower sealing valve 17 used for sealing the discharging track 406 is driven by the output end of the first sealing push rod 18, the first sealing push rod 18 and the second sealing push rod 20 are both electric push rods electrically connected with the controller 26, and the upper sealing valve 19 and the lower sealing valve 17 are used for sealing the tail end of the furnace body when feeding and discharging are not needed so as to avoid hot gas from being emitted;

referring to fig. 1, the controller 26 is fixedly mounted on the main housing 401, the controller 26 is electrically connected to the main motor 505, the first driving motor 304, the second driving motor 1, the third driving motor 404, the first lifting push rod 302 and the second lifting push rod 402 through cables, the main motor 505, the first driving motor 304, the second driving motor 1 and the third driving motor 404 are stepping motors, the controller 26 is a PLC controller, and the first lifting push rod 302 and the second lifting push rod 402 are electric push rods.

Wherein the first elevation plate 306 is fixedly provided with a first in-position sensor 305 for detecting whether the carrier cassette 2 is in position, the second elevation plate 403 is fixedly provided with a second in-position sensor 23 for detecting whether the carrier cassette 2 is in position, the third elevation plate 407 is fixedly provided with a third in-position sensor 25 for detecting whether the carrier cassette 2 is in position, and the first in-position sensor 305, the second in-position sensor 23 and the third in-position sensor 25 are all electrically connected with the controller 26 through cables.

The unit shell 504 is provided with a butt joint seat 7 convenient for installing an additional function device 8, the additional function device 8 is one or more of a transparent observation window, moisture absorption cotton or a camera, the transparent observation window is used for directly observing the video baking state, the camera is used for remotely observing the baking state, the moisture absorption cotton is used for washing out redundant moisture in the furnace body, the water content of food is convenient to control, and the moisture absorption cotton can be replaced by other moisture absorption and removal equipment as required;

specifically, the unit housing 504 is provided with a flow guide pipe 21 and a recovery pipe 16 at positions corresponding to the left and right ends of the upper rail 502 and the lower rail 501, respectively, the tail end of the recovery pipe 16 is fixedly provided with a fan 15, the output end of the fan 15 is fixedly provided with a return pipe 12, the return pipe 12 is communicated with a discharge pipe 13, the discharge pipe 13 is fixedly provided with a discharge valve 14, the return pipe 12 is communicated with the flow guide pipe 21, the return pipe 12 is provided with a return valve 11, the flow guide pipe 21 is communicated with an external air supply device through an air inlet pipe 9, the air inlet pipe 9 is fixedly provided with an air inlet valve 10, the unit housing 504 is fixedly provided with temperature detection sensors 27 at positions corresponding to the upper rail 502 and the lower rail 501, and the temperature detection sensors 27, the fan 15, the air inlet valve 10, the return valve 11 and the discharge valve 14 are electrically connected with the controller 26 through cables.

In practical applications, when the temperature detection sensor 27 detects that the temperature in the upper track 502 or the lower track 501 is lower than the preset temperature, the controller 26 closes the return valve 11, and opens the air inlet valve 10 and the exhaust valve 14, so that the external high-temperature air enters from the air inlet pipe 9, is distributed to the upper track 502 and the lower track 501 by the flow guide pipe 21, is recovered by the recovery pipe 16, and is then discharged by the exhaust pipe 13 under the suction of the fan 15, and when the temperature is restored to the proper temperature, the controller 26 closes the air inlet valve 10 and the exhaust valve 14, and then opens the return valve 11, so that the air drawn by the fan returns to the furnace body to participate in the circulation.

The working principle of the invention is as follows: when the tunnel furnace works, the length of the furnace body can be changed according to the number of the unit devices 5 connected in series, so that different installation sites of a factory are adapted, food is firstly placed in the carrying boxes 2 during baking, each carrying box 2 is provided with a unique identification code 204, the controller 26 needs to store the baking time length required by the identification codes 204 in advance, and workers need to put corresponding food into the furnace body according to different types of the identification codes 204 on the carrying boxes 2, so that the controller 26 can judge the number of circles of the food in each carrying box 2 which needs to be circularly baked in the furnace body.

Then the carrier box 2 is put into the feeding track 405, pushed by the corresponding gears on the feeding track 405 and the second lifting plate 403 and sent into the upper track 502, after the carrier box 2 is pushed by the main gear 503 in the upper track 502 and sent to the end of the oven body, the first lifting plate 403 in the transfer device 3 receives the carrier box 2 and then moves downward and sends into the lower track 501, when the carrier box 2 is transported to the head end of the oven body by the main gear 503 in the lower track 501, a circle of circulation is completed, at this time, if the baking time is reached, the carrier box 2 is discharged to the outside by the pushing of the corresponding gears in the third lifting plate 407 and the discharging track 406, if the baking time of the carrier box does not reach the designated time, the carrier box 2 is lifted by the third lifting plate 407 to the upper carrier box 2 and is sent into the upper track 502 again for the next circulation, and the identification code 204 corresponding to the carrier box 2 is recorded the number of circulation and the baking time until the required number of circulation is reached, and the oven body is sent out in the subsequent circulation.

In order to avoid the mutual jamming between the carrying boxes 2, the work flows of the transporting device 3 and the in-out switching device 4 need to be accurately controlled, specifically, when setting, the total time required for the carrying boxes 2 to move from the head end of the furnace body to the tail end of the furnace body needs to be determined, then the total time is divided into at least two work periods, each work period is divided into a material receiving period, a transferring period, a material discharging period and a returning period, and the work processes of the transporting device 3 and the in-out switching device 4 are circulated according to the corresponding time interval in each work period. First, when the transfer device 3 is in the material receiving period, the first lifting plate 306 is in the state of being butted against the upper rail 502 at this time, if the first in-position sensor 305 detects that the carrier box 2 is not in position, the transfer device 3 is not operated in this operation period, and if the first in-position sensor 305 detects that the carrier box is in position, by the time of the transfer period, the first lifting plate 306 will bring the carrier box 2 down to the position of being butted against the lower rail 501, then at the start of the discharging period, the first gear 303 on the first lifting plate 306 brings the carrier box 2 into the lower rail 501, and then at the start of the returning period, the first lifting plate 306 is raised again to the position of being butted against the upper rail 502 to wait for the arrival of the carrier box 2. When the in-out switching device 4 enters a material receiving period, the second lifting plate 403 is in a state of being butted with the upper rail 502, the third lifting plate 407 is in a state of being butted with the lower rail 501, the lower closing valve 17 and the upper closing valve 19 are both in a closed state, then the second in-position sensor 23 judges that the second lifting plate 403 has the carrying box 2 in position, if yes, the second lifting plate 403 maintains the current state in the material receiving period, if not, the upper closing valve 19 is temporarily opened, the carrying box 2 is added to the second lifting plate 403 through the feeding rail 405, and if the feeding rail 405 fails to add the carrying box 2 to the second lifting plate 403 within a limited time, the second lifting plate 403 maintains the current state in the material receiving period. The third in-position sensor 25 also determines whether a carrier box 2 is on the third lifting plate 407 in the material receiving period, if not, the third lifting plate 407 and the second lifting push rod 402 do not work in the working period, and in the discharging period of the working period, the second in-position sensor 23 determines that a carrier box 2 is on the second lifting plate 403, and then the carrier box 2 is sent to the upper track 502; if the third position sensor 25 detects that the carrier box 2 is on the third elevation plate 407 during the material receiving period, and the identification code detector 24 detects that the carrier box 2 has reached the toasting time, the second elevation push bar 402 does not operate during the operation period, and during the discharging period of the operation period, the lower closing valve 17 is opened, the third elevation plate 407 carries the carrier box 2 thereon into the discharging rail 406 to discharge, and the second elevation plate 403 carries the carrier box 2 thereon into the upper rail 502 if the carrier box 2 is detected by the second position sensor 23; if the third in-position sensor 25 detects that the carrier box 2 is on the third lifting plate 407 during the material receiving period and the identification code detector 24 detects that the carrier box 2 corresponding to the identification code 204 does not circulate for the specified number of times and baking time, the second lifting push rod 402 lifts the third lifting plate 407 upward to the position corresponding to the upper track 502 during the transferring period, the second lifting plate 407 is lifted to the non-working position together, then the carrier box 2 on the third lifting plate 407 is sent into the upper track 502 for the next baking cycle during the discharging period, and then the second lifting push rod 402 sends the third lifting plate 407 back to the position where it is butted with the lower track 501 during the returning period, thereby completing the working period.

According to the invention, the phenomenon that the newly added carrying boxes 2 and the carrying boxes 2 which need to be recycled are mutually overlapped and clamped can be avoided between the carrying boxes 2, different types of food which need to be baked for different durations can be effectively and simultaneously baked, the length of the furnace body can be freely assembled and customized through the unit devices according to the field size in a factory, and the baking effect can not be influenced, so that the invention has high practical value.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a double-deck circulating tunnel furnace convenient to different food mix toasts which characterized in that, this tunnel furnace includes:

the furnace body is formed by connecting at least two unit devices (5) in series end to end, each unit device (5) comprises a unit shell (504), and the inside of each unit shell (504) is divided into an upper rail (502) and a lower rail (501) from top to bottom;

the carrying box (2) can slide along the upper rail (502) or the lower rail (501), the carrying box (2) comprises a box body (203) for containing food, an identification code (204) is arranged above the box body (203), racks (202) are symmetrically arranged on the left side and the right side of the box body (203), main motors (505) are mounted at the upper end and the lower end of the unit shell (504), and two groups of main gears (503) meshed with the racks (202) are arranged at the output ends of the main motors (505) respectively corresponding to the upper rail (502) and the lower rail (501);

the transfer device (3) is arranged at the tail end of the furnace body, the transfer device (3) comprises a transfer shell (301), a first lifting push rod (302) is fixedly mounted on the transfer shell (301), a first lifting plate (306) which can be aligned with the upper track (502) or the lower track (501) is driven at the tail end of the first lifting push rod (302), a first driving motor (304) is fixedly mounted on the first lifting plate (306), and a first gear (303) meshed with the rack (202) is driven at the output end of the first driving motor (304);

the feeding and discharging conversion device (4) comprises a main shell (401) installed at the head end of the furnace body, a feeding track (405) facilitating food entering is fixed at the position, corresponding to the upper track (502), of the main shell (401), a second lifting plate (403) is arranged at the position, corresponding to the feeding track (405), of the main shell (401), an identification code detector (24) used for detecting an identification code (204) is fixedly installed on the second lifting plate (403), a discharging track (406) facilitating food discharging is fixed at the position, corresponding to the lower track (501), of the main shell (401), a third lifting plate (407) is arranged at the position, corresponding to the discharging track (406), of the main shell (401), a second lifting push rod (402) is fixedly installed on the main shell (401), the driving end of the second lifting push rod (402) is used for controlling the second lifting plate (403) and the third lifting plate (407) to lift together, a second driving motor (1) is fixedly installed on the second lifting plate (403) and the third lifting plate (407), a gear rack (202) and a third driving motor (404) is installed on the main shell (404), and a rack (202) and a rack (404) is fixedly installed on the driving motor (404);

a second closed push rod (20) is fixedly mounted on the main shell (401), an upper closed valve (19) used for closing the tail end of the feeding track (405) is driven by the output end of the second closed push rod (20), a first closed push rod (18) is fixedly mounted on the main shell (401), a lower closed valve (17) used for closing the discharging track (406) is driven by the output end of the first closed push rod (18), and the first closed push rod (18) and the second closed push rod (20) are electric push rods electrically connected with a controller (26);

the controller (26) is fixedly installed on the main shell (401), the controller (26) is electrically connected with the main motor (505), the first driving motor (304), the second driving motor (1), the third driving motor (404), the first lifting push rod (302) and the second lifting push rod (402) through cables, a first in-position sensor (305) used for detecting whether the carrying box (2) is in position is fixedly installed on the first lifting plate (306), a second in-position sensor (23) used for detecting whether the carrying box (2) is in position is fixedly installed on the second lifting plate (403), a third in-position sensor (25) used for detecting whether the carrying box (2) is in position is fixedly installed on the third lifting plate (407), and the first in-position sensor (305), the second in-position sensor (23) and the third in-position sensor (25) are electrically connected with the controller (26) through cables;

unit casing (504) are provided with honeycomb duct (21) and recovery tube (16) respectively corresponding the left and right sides both ends department of last track (502) and lower track (501), the terminal fixed mounting of recovery tube (16) has fan (15), and the output fixed mounting of fan (15) has return flow pipe (12), it has discharge tube (13) to communicate on return flow pipe (12), and fixed mounting has drainage valve (14) on discharge tube (13), return flow pipe (12) and honeycomb duct (21) intercommunication, and return flow pipe (12) are last to install return flow valve (11), honeycomb duct (21) are through air-supply line (9) and outside air feeder intercommunication, and fixed mounting has air inlet valve (10) on air-supply line (9), unit casing (504) are corresponding last track (502) and lower track (501) department fixed mounting have temperature-detecting sensor (27), and temperature-detecting sensor (27), fan (15), air inlet valve (10), return flow valve (11) and discharge valve (14) all through cable and controller (26) electric connection.

2. The double-layer circulating tunnel furnace for facilitating mixed baking of different foods as claimed in claim 1, wherein: the box body (203) is provided with rollers (201), and the upper track (502) and the lower track (501) are provided with guide plates (6) for guiding the carrying box (2) to move.

3. The double-layer circulating tunnel furnace for facilitating mixed baking of different foods as claimed in claim 1, wherein: the main motor (505), the first driving motor (304), the second driving motor (1) and the third driving motor (404) are all stepping motors, the controller (26) is a PLC controller, and the first lifting push rod (302) and the second lifting push rod (402) are all electric push rods.

4. The double-layer circulating tunnel furnace for facilitating mixed baking of different foods as claimed in claim 1, wherein: the unit shell (504) is provided with a butt joint seat (7) convenient for installing an additional function device (8), and the additional function device (8) is one or more of a transparent observation window, moisture absorption cotton or a camera.

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