A pancake production line with a folded blank function

Abstract

The utility model provides a kind of thin pancake production line with the function of stacking dough, including rack and controller, first conveying device and second conveying device are arranged on the rack, the left end of first conveying device is movable end, lifting drive device and interface blank device are equipped on the rack. First detection unit is equipped at movable end, second detection unit is equipped at second conveying device, first detection unit and second detection unit are connected at the input end of controller, lifting drive device, second conveying device and interface blank device are connected at the output end of controller. The first of the continuous two doughs transported on first conveying device is sent to the second conveying device with its interface, and the second is dropped on the interface blank device as the movable end is raised, and then it is turned over by the interface blank device and placed on the first dough, completing the precise alignment of two doughs and the stacking dough function. When the interface blank device is turned over, the air pump sprays high-pressure gas to prevent the dough from sticking to the interface blank plate.

Description

Technical Field

[0001] This utility model relates to the field of dough production technology, and in particular to a pancake production line with dough stacking function. Background Technology

[0002] The production of Peking duck pancakes involves several steps, including kneading the dough, letting it rest, shaping the dough, pressing it into form, and cooking it. The dough-shaping step is particularly labor-intensive and time-consuming. Hand-shaping the dough is inefficient and highly susceptible to human error, hindering industrial production. Using a screw conveyor to shape the dough can damage the gluten, resulting in easily broken pancakes. Furthermore, it only produces single pancakes, leading to thicker pancakes that waste flour and fail to meet the quality requirements for Peking duck pancakes.

[0003] To address the aforementioned issues, patent application number 201720968851.4 discloses a dough stacking device and a dough production line using this device. In this production line, oiled dough pieces fall from the rear end of a first conveyor belt onto the conveying plane of a second conveyor belt. Normally, the second conveyor belt remains stationary, so the dough pieces falling from the first conveyor belt stack on top of the previous ones, achieving dough stacking. Simultaneously, when the oiled dough pieces pass by a first sensor, they are detected. Upon receiving two consecutive detection signals, the first controller controls the second conveyor belt to move forward a certain distance, causing the two stacked dough pieces to rotate backward. The front end of the second conveyor belt near the first conveyor belt becomes clear to accommodate other dough pieces. However, during use, the following problems were found in the production line: (1) When the second sheet falls from the first conveyor belt, the second sheet may stick to the first conveyor belt, causing the second sheet to fall late and not be able to be accurately stacked on the first sheet; (2) When the oiling roller applies oil, it is difficult to accurately control its contact force with the sheet. If it is too large, the sheet will be pressed thinner again. If it is too small, the oiling on the sheet will be uneven. Moreover, the edge of the sheet will collapse downward to a certain extent after being placed. Therefore, in practice, the oiling on the edge of the sheet will be uneven. After the two sheets are pressed into a thin pancake, it is difficult to peel them apart. The pancake will be damaged. Utility Model Content

[0004] The purpose of this invention is to propose a pancake production line with a stacking function to solve the problems existing in the prior art.

[0005] The technical solution of this utility model is:

[0006] A pancake production line with a dough stacking function includes a frame and a controller. The frame is provided with a first conveying device and a second conveying device connected end to end to convey dough to the left from right to left. The left end of the first conveying device is a movable end that can move up and down. The frame is provided with a lifting drive device, the output end of which is connected to the movable end to drive it to move up and down. When the lifting drive device moves, it can drive the movable end to switch between an upper working position and a lower working position. The frame is provided with a rotatable dough receiving device, which is used to receive the dough conveyed from the first conveying device at the upper working position and dump the received dough onto the second conveying device when flipping from right to left.

[0007] A first detection unit is set at the active end, and a second detection unit is set at the right end of the second conveying device on the frame. Both the first and second detection units are used to detect whether there is a dough blank at the corresponding position. The position of the second detection unit corresponds to the position where the dough blank receiving device flips to the left and drops the dough blank.

[0008] The first detection unit and the second detection unit are connected to different input terminals of the controller to transmit detection signals to it. The lifting drive device, the second conveying device and the blank receiving device are connected to different output terminals of the controller for controlled operation. The controller is used to control the lifting drive device to move back and forth, drive the blank receiving device to flip, and drive the second conveying device to operate or stop.

[0009] Furthermore, the first conveying device includes a support plate on the right and a movable end plate on the left, as well as a reversing tension roller group and a first conveyor belt. The support plate is fixed on the frame, and the movable end plate is spaced a distance from the support plate in the left-right direction. The first conveyor belt passes around the support plate, the movable end plate and the reversing tension roller group in sequence to form a closed loop.

[0010] Furthermore, the reversing tensioning roller assembly includes at least one movable roller slidably mounted on the frame, and a return spring is provided between the movable roller and the frame for driving the movable roller to reset.

[0011] Furthermore, the blank receiving device includes a blank receiving plate and an air pump. The upper end of the blank receiving plate is used to receive the blank delivered by the first conveying device. The air pump is electrically connected to an output port of the controller to pump high-pressure gas outward in a controlled manner. The blank receiving plate is provided with air holes that can blow air onto its upper surface. The air outlet of the air pump is connected to the air holes.

[0012] Furthermore, the first conveying device includes a support plate on the right and a movable end plate on the left, as well as a reversing tension roller group and a first conveyor belt. The support plate is fixed on the frame, and the movable end plate is spaced a distance from the support plate in the left-right direction. The first conveyor belt passes around the support plate, the movable end plate and the reversing tension roller group in sequence to form a closed loop.

[0013] Furthermore, the reversing tensioning roller assembly includes at least one movable roller slidably mounted on the frame, and a return spring is provided between the movable roller and the frame for driving the movable roller to reset.

[0014] Furthermore, the blank receiving device includes a blank receiving plate and an air pump. The upper end of the blank receiving plate is used to receive the blank delivered by the first conveying device. The air pump is electrically connected to an output port of the controller to pump high-pressure gas outward in a controlled manner. The blank receiving plate is provided with air holes that can blow air onto its upper surface. The air outlet of the air pump is connected to the air holes.

[0015] Furthermore, the mating blank is provided with a ventilation interlayer, the bottom of the air hole is connected to the ventilation interlayer, and the air outlet of the air pump is connected to the ventilation interlayer.

[0016] Furthermore, the upper surface of the bonding blank is provided with a number of spaced ribs, and the air holes are evenly distributed on the ribs.

[0017] Furthermore, from right to left, the frame is provided with an oil-sprinkling device, an oil-spreading device, a powder-sprinkling device, and a powder-spreading device. Both the oil-spreading device and the powder-spreading device include a vertically arranged brush that rotates along its own central axis. The bottom of each brush includes a brush head, the length of which is greater than the diameter of the dough. The distance between the lower end of the brush head and the upper surface of the first conveying device is adapted to the thickness of the dough.

[0018] Furthermore, the oil-filling device includes an oil-filling jar with an open top, an oil outlet at the bottom of the jar, and a vertically arranged auger inside the jar. The auger is used to deliver the material to the oil outlet at the lower end. A sleeve is provided around the auger, and a stirring rod is provided outside the sleeve in the jar.

[0019] Furthermore, the sleeve has an oil inlet groove on its side wall for the oil to enter. The oil inlet groove starts from the upper end face of the sleeve and ends at the lower half of the sleeve, so that the cross-sectional shape of the upper end of the sleeve is annular and the cross-sectional shape of the lower end is C-shaped.

[0020] Furthermore, a scraper is provided on the frame, located at the lower end of the first conveyor belt to scrape off the oil surface thereon.

[0021] Advantages of this invention: In use, after the dough blank is conveyed to the movable end by the first conveying device, when the first detection unit first senses the dough blank, the lifting drive device moves the movable end to the upper working position. However, the first dough blank is still transported to the second conveying device by the first conveying device located at the lower working position. After the second detection unit, located at a designated position, detects the first dough blank on the second conveying device, it controls the second conveying device to stop. At this time, the first dough blank stops at the designated position on the second conveying device. When the first detection unit senses the second dough blank, the lifting drive device is triggered and falls, causing the movable end to switch to the lower working position. However, the second dough blank is still sent to the dough receiving device by the movable end located at the upper working position. The dough receiving device rotates 180 degrees to the left after a certain delay from the time node when the first detection unit is triggered for the second time, and the dough blank on it falls onto the second conveying device. By setting the delay time parameter for the first dough blank to stop, it is ensured that the second dough blank falling on the dough receiving device will fall exactly on the first dough blank and be precisely aligned with it, thus completing the dough blank stacking function.

[0022] During the final stage of the leftward flipping stroke of the blank receiving device, the air pump sprays high-pressure gas onto the surface of the blank receiving plate to prevent the blank from sticking to the blank receiving plate and affecting the realization of the stacking blank function.

[0023] The special design of the oil-filling device allows the relatively viscous oil paste in the flaky pastry container to be smoothly squeezed out and fall onto the dough passing underneath. The oil paste that has fallen onto the dough is then evenly spread on every part of the dough's surface by a brush rotating along the vertical axis. After dusting and dusting with powder, a non-stick layer is formed. When two dough pieces are placed together, one facing up and the other down, the non-stick layers on the two dough pieces face each other, resulting in a better non-stick effect and making it easier to peel off the pastry without damaging it. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0026] Figure 2 for Figure 1 A schematic diagram of the internal structure of the oil injection device in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the first transmission device;

[0028] Figure 4This is a schematic diagram of the structure of the second transmission device;

[0029] Figure 5 A top-view structural diagram of the second conveying device;

[0030] Figure 6 This is a schematic diagram of the framework structure of the control system;

[0031] In the diagram, 1. Frame; 2. First conveying device; 3. Second conveying device; 4. Oil-sprinkling mechanism; 5. Oil-spreading mechanism; 6. Powder-sprinkling mechanism; 7. Powder-spreading mechanism; 8. Lifting drive device; 9. Dough receiving device; 10. Controller; 11. First photoelectric sensor; 12. Second photoelectric sensor; 13. Scraper; 14. Receiving box.

[0032] 21. Support plate; 22. Movable end plate; 23. Reversing tension roller assembly; 24. First conveyor belt; 41. Oil churn; 42. Screwdriver; 43. Sleeve; 44. Stirring rod; 45. Oil delivery pipe; 91. Surface blank; 92. Forward and reverse motor; 93. Air hole; 94. Air pump; 95. Air pipe; 96. Rib. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1: A pancake production line with stacking dough function, such as Figure 1 As shown, it includes a frame 1 and a conveying device. The conveying device includes a conveying plane for transporting dough blanks from right to left. Specifically, the conveying device includes a first conveying device 2 on the right and a second conveying device 3 on the left.

[0035] Along the conveying direction of the conveying plane, the frame 1 is equipped with an oil-filling mechanism 4, an oil-spreading mechanism 5, a powder-sprinkling mechanism 6, and a powder-sprinkling mechanism 7. During the flow of the dough on the first conveying device 2, the processes of applying oil-filling paste, spreading the oil-filling paste evenly, sprinkling powder, and spreading the powder evenly are completed sequentially to ensure that the dough is adequately coated with an anti-sticking layer. After the dough is stacked, pressed thin, and cured, the two formed pancakes can be easily separated without the pancakes being damaged due to excessive sticking.

[0036] The left end of the first conveying device 2 is a movable end that can move up and down. A lifting drive device 8 is mounted on the frame 1, its position corresponding to the left end of the first conveying device 2. Its function is to drive the movable end to move up and down. When the lifting drive device 8 moves, it can switch the movable end between the upper and lower working positions. The frame 1 also has a dough receiving device 9, its position corresponding to the right end of the second conveying device 3. Both the second conveying device 3 and the dough receiving device 9 are used to dock with the first conveying device 2, their function being to receive the dough delivered by the first conveying device 2. Specifically, the second conveying device 3 is used to receive the dough conveyed by the first conveying device 2 in the lower working position, and the dough receiving device 9 is used to receive the dough conveyed by the first conveying device 2 in the upper working position.

[0037] The oil-filling mechanism 4 includes an open-top oil-filling jar 41, a vertical auger 42 installed inside the oil-filling jar, a sleeve 43 surrounding the auger 42, and a stirring rod 44 located outside the sleeve 43. The oil-filling jar 41 is fixedly mounted on the frame 1. The bottom of the oil-filling jar 41 has an oil outlet, and the bottom of the oil-filling jar 41 is connected to an oil delivery pipe 45. The end of the oil delivery pipe 45 away from the oil-filling jar 41 is fixed to the frame 1 to form an oil-filling station. When the dough is conveyed to this station, it can be filled with oil. An oil inlet is provided on the side wall of the sleeve 43. The oil inlet starts at the upper end of the sleeve 43 and ends at the lower half of the sleeve 43. Therefore, the upper half of the sleeve 43 with the oil inlet has a C-shaped cross-section, and the lower half of the sleeve 43 without the oil inlet has an annular cross-section. In this structure, the oil paste in the oil paste container 41 can enter the sleeve 43 through the oil inlet. With the pushing and pressurizing action of the auger 42, the viscous oil paste is squeezed out through the oil delivery pipe 45 and injected onto the dough on the conveyor belt below.

[0038] The function of the stirring rod 44 is to continuously stir the shortening in the shortening container 41 to ensure uniform mixing. In this embodiment, the stirring rod 44 and the auger 42 are driven by the same power unit, which is an electric motor.

[0039] In this embodiment, the start / stop of the power unit and the outflow of the grease are both manually controlled during startup. A cap is fitted onto the end of the oil pipe 45; when the cap is removed, the grease can flow out; when the cap is on, the grease will not flow out.

[0040] The oil-spreading mechanism 5 and the powder-spreading mechanism 7 have similar structures. The following description uses the oil-spreading mechanism 5 as an example. The oil-spreading mechanism 5 includes a vertically arranged oil-spreading brush 51. Driven by a power source, the oil-spreading brush 51 rotates around its central axis to evenly spread the oil-spreading paste on the dough. The length of the brush head 23 is greater than the diameter of the dough, and the vertical distance between the lower end of the brush head and the upper surface of the conveying plane of the first conveying device 2 is adapted to the thickness of the dough. Because the brush head is relatively soft, this arrangement ensures that the oil-spreading paste on the dough is fully and evenly spread, covering every part of the dough's surface without any omissions, while also preventing the dough from being too thin.

[0041] The first conveying device 2 specifically includes a support plate 21 on the right, a movable end plate 22 on the left, and a reversing tensioning roller group 23 disposed between the support plate 21 and the movable end plate 22. It also includes a first conveyor belt 24 that sequentially winds around the aforementioned components. The support plate 21 is fixed to the frame 1. The movable end plate 22 is driven up and down by the lifting drive device 8, thus forming the movable end with the corresponding ends of the movable end plate 22 and the first conveyor belt 24 that moves up and down with it. The lifting drive device 8 is fixed to the frame 1. In this embodiment, the lifting drive device 8 is a linear cylinder. In other embodiments, the lifting drive device 8 can also be replaced by a hydraulic rod or a linear electric push rod. The support plate 21 and the movable end plate 22 are spaced a certain distance apart and connected only by the first conveyor belt 24, giving the left and right ends of the first conveying device 2 elasticity and flexibility. Therefore, when the movable end plate 22 is raised to a high position by the lifting drive device 8, the first conveyor belt 24 will tilt appropriately to deliver the blank on it to the upper position, thus giving the movable end an upper working position. When the movable end plate 22 is lowered to be flush with the support plate 21, the blank transported by the first conveyor belt 24 will flow to the left in the horizontal direction, so that the movable end plate 22 has a lower working position.

[0042] The function of the reversing tensioning roller assembly 23 is to tension the first conveyor belt 24. It includes at least one movable roller slidably mounted on the frame 1. When the movable end plate 22 moves upward, the movable roller adaptively generates displacement to compensate for changes in the conveyor belt length between the movable end plate 22 and the support plate 21. When the movable end plate 22 returns to its original position downward, the movable roller automatically returns to its original position under the action of a spring, thus tensioning the first conveyor belt 24. The use of movable rollers to tension the conveyor belt is prior art, and its specific structure will not be illustrated in detail in this application.

[0043] The blank receiving device 9 includes a blank receiving plate 91 and a forward / reverse motor 92 for driving the blank receiving plate 91 to rotate alternately 180 degrees forward and 180 degrees backward. Normally, the blank receiving plate 91 faces upward; after being rotated 180 degrees by the forward / reverse motor 92, it faces downward. Normally, the blank receiving plate 91 is positioned corresponding to the movable end plate 22 of the upper working position to receive the blanks transported from the upper working position; after being rotated 180 degrees, the blank receiving plate 91 is positioned directly above the second conveying device 3, so that the blanks on it can be transferred onto the lower second conveying device 3. It is important to emphasize that the position of the blank receiving plate 91 when it is rotated corresponds to the stopping position of the lower blank to ensure that the overlap error of the two blanks meets the requirements.

[0044] To facilitate smooth separation of the blank flipped to the left from the receiving blank plate 91, an air pump 94 is provided on the frame 1. Several air holes 93 are evenly distributed on the upper surface of the receiving blank plate 91, and the air outlet of the air pump 94 is connected to the air holes 93. Specifically, a ventilation interlayer is provided inside the receiving blank plate 91, the bottom of the air holes 93 is connected to the ventilation interlayer, and the air outlet of the air pump 94 is connected to the ventilation interlayer through a flexible air pipe 95.

[0045] In order to further reduce the contact area between the blank and the receiving blank plate 91 and accelerate the separation speed of the blank that has turned to the left side from the receiving blank plate 91, the upper surface of the receiving blank plate 91 is provided with a number of ribs 96 that are spaced back and forth and extend in the left and right direction, and the air holes 93 are evenly distributed on the ribs 96.

[0046] In this embodiment, the forward and reverse motor is a servo motor, but in other embodiments, a stepper motor can be used instead.

[0047] In order to realize the automatic stacking function of blanks, this utility model also includes a control system. The control system includes a controller 10, a first photoelectric sensor 11 and a second photoelectric sensor 12. The first photoelectric sensor 11 is set at the left end of the first conveying device 2, and the second photoelectric sensor 12 is set at the corresponding position of the second conveying device 3. Specifically, the second photoelectric sensor 12 is aligned with the falling point of the blank after the blank plate 91 is flipped.

[0048] The first photoelectric sensor 11 and the second photoelectric sensor 12 are electrically connected to different input ports of the controller 10 to transmit detection signals. The second conveying device 3, the lifting drive device 8, and the blank receiving device 9 are electrically connected to different output ports of the controller 10 for controlled operation. Specifically, the controller 10 controls the lifting drive device 8 to reciprocate according to the signal sent by the first detection unit, thereby driving the movable end to alternately switch between the upper and lower working positions. Simultaneously, after receiving the signal transmitted by the first photoelectric sensor 11, it alternately drives the blank receiving device 9 to flip after an interval delay time t1. After receiving the signal transmitted by the first photoelectric sensor 11, it drives the second conveying device 3 to continue operating after an interval delay time t2. The controller 10 controls the second conveying device 3 to stop operating according to the signal sent by the second photoelectric sensor 12.

[0049] The principles of the first photoelectric sensor 11 and the second photoelectric sensor 12 are existing technologies and will not be described in detail in this application. However, it is understood that in other embodiments, the first photoelectric sensor 11 can be replaced by a first detection unit that uses other technologies to detect whether there is a target object at a specific location, and the second photoelectric sensor 12 can be replaced by a second detection unit that uses other technologies to detect whether there is a target object at a specific location.

[0050] In this embodiment, in order to scrape off the residual flour and oil on the first conveyor belt 24, a scraper 13 is fixedly provided on the frame 1 below the first conveyor belt 24 and in contact with it. A receiving box 14 is also fixedly provided on the frame 1. The receiving box 14 is located directly below the scraper 13 to collect the scraped flour and oil.

[0051] Working principle: Initially, the movable end of the first conveying device 2 is in the lower working position, and the second conveying device 3 is in operation.

[0052] The right end of the first conveyor device 2 connects to the blank forming machine. Multiple blanks are transported to the left via the first conveyor device 2, and during the transport process, oil and powder are applied to form an anti-sticking layer on the upper part of the blanks. Subsequent blanks continue to be transported to the left to the second conveyor device 3. When the first blank reaches the first photoelectric sensor 11, the controller 10 controls the lifting drive device 8 to pull the movable end plate 22 to switch the movable end of the first conveyor device 2 to the upper working position. However, the first blank is still sent from the movable end of the lower working position to the second conveyor device 3 that it connects to. When the second conveyor device 3 sends the first blank to the second photoelectric sensor 12 to the left, the controller 10 controls the second conveyor device 3 to stop moving.

[0053] When the second blank passes the first photoelectric sensor 11, the first photoelectric sensor 11 is triggered a second time (the first photoelectric sensor 11 and the movable end plate 22 are fixed and will rise and fall with it). After that, the controller 10 controls the lifting drive device 8 to push the movable end plate 22 to the lower working position. However, the second blank is still sent to the receiving blank plate 91 that is flush with it by the movable end of the upper working position. At the same time, after receiving the signal transmitted by the first photoelectric sensor 11, the controller 10 will also control the forward and reverse motor to delay for a certain period of time to complete a working cycle. One working cycle of the forward and reverse motor includes rotating 180 degrees to the left and then rotating 180 degrees to the right to reset. The forward and reverse motor can rotate 180 degrees to the left to make the receiving blank plate 52 flip the second blank on it to the top of the first blank. In the last part of the flipping stroke of the receiving blank plate 52, the controller 10 simultaneously controls the air pump to start, and the air holes 54 on the receiving blank plate 52 start blowing air to quickly blow the second blank down. The falling second blank is exactly stacked on the first blank.

[0054] Then, after a set delay, the controller 10 will control the second conveyor 3 to continue moving to the left, thus continuing to transport the two stacked dough pieces to the left. By repeating the above process, continuous cyclical production of the dough pieces' oiling, coating, flouring, and stacking processes can be achieved.

[0055] Adjusting the delay time of the controller 10 can adjust the dwell position of the dough blank on the second conveying device 3, ensuring that the error after the two dough blanks are stacked meets the requirements.

[0056] Example 2: A pancake production line with stacking function. The difference between this example and Example 1 is that the ribs 96 extend in the front-to-back direction. All other structures are the same as in Example 1.

[0057] Example 3: A pancake production line with a stacking function. The difference between this example and Example 1 is that the ribs 96 extend in a wavy shape. All other structures are the same as in Example 1.

[0058] Example 4: A pancake production line with a stacking function. This example differs from Example 1 in that the structure of the first conveyor 1 is the same as the second conveyor 2. The support plate 21 is continuous, and the first conveyor belt 24 is completely wrapped around the support plate. The movable end plate 22 is no longer provided. However, the right end of the support plate 21 is rotatably connected to the frame 1, and the lower end of the lifting drive device 8 is hinged to the support plate 21. The movable end of the lifting drive device 8 is hinged to the left end of the support plate 21 via a connecting rod. In this structure, when the lifting drive device 8 moves up and down, it causes the support plate 21 to tilt as a whole around its right end as the center point, thus switching between the upper and lower working positions.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pancake production line with a stacking function, characterized in that: The device includes a frame and a controller. From right to left, the frame is equipped with a first conveying device and a second conveying device connected end to end to convey dough blanks to the left. The left end of the first conveying device is a movable end that can move up and down. The frame is equipped with a lifting drive device, the output end of which is connected to the movable end to drive it to move up and down. When the lifting drive device moves, it can drive the movable end to switch between an upper working position and a lower working position. The frame is equipped with a rotatable dough blank receiving device, which is used to receive the dough blanks conveyed from the first conveying device at the upper working position and dump the received dough blanks onto the second conveying device when flipping from right to left. A first detection unit is set at the active end, and a second detection unit is set at the right end of the second conveying device on the frame. Both the first and second detection units are used to detect whether there is a dough blank at the corresponding position. The position of the second detection unit corresponds to the position where the dough blank receiving device flips to the left and drops the dough blank. The first detection unit and the second detection unit are connected to different input terminals of the controller to transmit detection signals to it. The lifting drive device, the second conveying device and the blank receiving device are connected to different output terminals of the controller for controlled operation. The controller is used to control the lifting drive device to move back and forth, drive the blank receiving device to flip, and drive the second conveying device to operate or stop.

2. A pancake production line with a stacking function as described in claim 1, characterized in that: The first conveying device includes a support plate on the right and a movable end plate on the left, as well as a reversing tension roller group and a first conveyor belt. The support plate is fixed on the frame, and the movable end plate is spaced a distance from the support plate in the left-right direction. The first conveyor belt passes around the support plate, the movable end plate and the reversing tension roller group in sequence to form a closed loop.

3. A pancake production line with a stacking function as described in claim 2, characterized in that: The reversing tensioning roller assembly includes at least one movable roller slidably mounted on the frame, and a return spring is provided between the movable roller and the frame for driving the movable roller to reset.

4. A pancake production line with a stacking function as described in claim 2, characterized in that: The blank receiving device includes a blank receiving plate and an air pump. The upper end of the blank receiving plate is used to receive the blank delivered by the first conveying device. The air pump is electrically connected to an output port of the controller to pump high-pressure gas outward in a controlled manner. The blank receiving plate is provided with air holes that can blow air onto its upper surface. The air outlet of the air pump is connected to the air holes.

5. A pancake production line with a stacking function as described in claim 4, characterized in that: The ventilated interlayer is provided inside the slab, the bottom of the air hole is connected to the ventilated interlayer, and the air outlet of the air pump is connected to the ventilated interlayer.

6. A pancake production line with a stacking function as described in claim 4, characterized in that: The upper surface of the joint blank is provided with a number of spaced ribs, and the air holes are evenly distributed on the ribs.

7. A pancake production line with a stacking function as described in any one of claims 1 to 6, characterized in that: The frame is arranged from right to left as follows: an oil-sprinkling device, an oil-spreading device, a powder-sprinkling device, and a powder-spreading device. Both the oil-spreading device and the powder-spreading device include vertically arranged brushes that rotate along their own central axis. The bottom of each brush includes a brush head. The length of the brush head is greater than the diameter of the dough, and the distance between the lower end of the brush head and the upper surface of the first conveying device is adapted to the thickness of the dough.

8. A pancake production line with a stacking function as described in claim 7, characterized in that: The oil-filling device includes an oil-filling jar with an open top, an oil outlet at the bottom of the jar, and a vertical auger inside the jar for conveying materials to the lower oil outlet. The auger is fitted with a sleeve, and a stirring rod is installed outside the sleeve inside the jar.

9. A pancake production line with a stacking function as described in claim 8, characterized in that: The sleeve has an oil inlet on its side wall for the oil to enter. The oil inlet starts from the upper end face of the sleeve and ends at the lower half of the sleeve, so that the cross-sectional shape of the upper end of the sleeve is annular and the cross-sectional shape of the lower end is C-shaped.

10. A pancake production line with a stacking function as described in claim 7, characterized in that: The frame is equipped with a scraper located at the lower end of the first conveyor belt to scrape off the oil surface thereon.

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