Filling method of fresh dough

Abstract

The invention belongs to a fresh dough filling method. Comprising the following three steps: atomizing and spraying oil on the inner wall of the composite paper can, filling fresh dough, and compacting the fresh dough. The method comprises the following steps: 1, atomizing and spraying oil on the inner wall of the composite paper can; 2, filling the fresh dough into a composite paper can; step 3, compacting the fresh dough; the invention relates to a method for filling fresh leavened dough into a composite paper can. A procedure of atomizing and spraying oil on the inner wall of the composite paper can is set before the fresh leavened dough is filled; and a process of compacting the composite paper can filled with the fresh fermented dough is set after the fresh fermented dough is filled. Various problems when the fresh dough is filled into the packaging container composite paper can can be perfectly solved, so that the can cover can be sealed subsequently. The method has the advantages of reasonable process design, simple equipment structure, equipment investment saving and the like, is very suitable for being used on a full-automatic production line of fresh dough products, and can greatly improve the production efficiency.

Description

Technical Field

[0001] The invention relates to a method for filling a viscoelastic product into a slender can body, and is particularly suitable for a method and steps for filling a fresh dough product into a composite paper can. Background Art

[0002] In the existing canning filling technology, the products filled into the tinplate three-piece cans are mostly fluid products such as carbonated beverages, coconut milk, rice wine, eight-treasure porridge, and powder products such as condiments and milk powder; while the products filled into the composite paper cans are mostly solid products such as tea, nuts, and potato chips; but fresh dough products are neither fluid nor powder nor solid, but closer to a "viscoelastic body" form. Fresh dough is both viscous and elastic, and it is very easy to change its shape under the action of various external forces such as kneading, stretching, compression, and placement, and it can also gradually restore its original state partially or completely after the external force is removed. Although fresh dough can flow within a certain range, the flow speed is very slow, and it will not flow as fast as liquid. This makes it particularly difficult to fill fresh dough into composite paper cans (packaging containers). In addition, fresh dough is also very easy to adhere to the packaging container. Therefore, the filling of fresh dough during the production process and the removal of fresh dough during the consumption process also need to consider the technical problem of how to avoid adhesion. In short, the filling and anti-adhesion problems of fresh dough in the form of viscoelastic bodies are practical problems faced and urgently need to be solved in existing packaging technologies. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the existing packaging technology and propose a method for filling fresh dough into a composite paper can. Filling the fresh dough into the composite paper can can meet the needs of the automated packaging production line, improve the production efficiency of the fresh dough, and also reduce the labor intensity of the production workers; the present invention has the advantages of simple equipment, smooth filling, reasonable design, high production efficiency, etc.

[0004] The method for filling fresh dough into a composite paper can according to the present invention mainly comprises three main steps and methods: spraying oil on the inner wall of the composite paper can by atomization, filling the fresh dough, and compacting the fresh dough;

[0005] The first step is to spray the inner wall of the composite paper can with oil. The inner wall of the composite paper can for packaging the fresh dough product is sprayed with edible oil. The purpose is: firstly, to avoid the fresh dough product from sticking to the composite paper can when it is filled into the composite paper can, and the fresh dough can easily slide into the bottom of the composite paper can without being stuck in any position in the middle of the composite paper can; secondly, after opening the package, it is easy for consumers to take out the fresh dough from the composite paper can packaging, and the fresh dough product is not easy to stick to the hands and the composite paper can.

[0006] Step 2: Filling the freshly fermented dough. The freshly fermented dough is filled into a composite paper can whose inner wall is atomized and sprayed with edible oil. In the present invention, the cylindrical freshly fermented dough is rolled by a freshly fermented dough forming machine at the front end of the production line. The diameter and length of the freshly fermented dough can be precisely controlled by the freshly fermented dough forming machine. The packaging composite paper can is delivered to the filling station along the flexible conveyor belt, and the filling positioning device positions and clamps the composite paper can. The freshly fermented dough is successively and vertically dropped from the outlet of the freshly fermented dough forming machine one by one into the composite paper can to be filled (depending on the type and function of the freshly fermented dough forming machine on the production line, it can be a single-head freshly fermented dough forming machine or a multi-head freshly fermented dough forming machine, corresponding to single-head filling or multi-head filling). During the filling process, due to the viscoelastic characteristics of the freshly fermented dough, a freshly fermented dough guiding ring composed of stainless steel wires is arranged at the lower end of the outlet of the freshly fermented dough forming machine. Its function is similar to that of a "funnel" in a filling machine. The freshly fermented dough guiding ring has a hyperbolic and waist-shaped structure with thick ends and a thin middle. In order to reduce the friction and adhesion between the stainless steel plate usually used in a funnel and the freshly fermented dough, the freshly fermented dough guiding ring is composed of several stainless steel wires instead of a stainless steel plate. The diameter of the stainless steel wires is between 3 and 8 mm. When welding and fixing, the stainless steel wires in the latitude direction need to surround the stainless steel wires in the longitude direction. The hyperbolic and waist-shaped structure of the freshly fermented dough guiding ring with thick ends and a thin middle can play a good guiding role. The diameter of its thinnest part in the middle is slightly larger than the diameter of the freshly fermented dough, and the diameter of its thick ends is close to the inner diameter of the mouth of the composite paper can. Its height can be 1 / 4 - 1 / 2 of the height of the composite paper can. The freshly fermented dough guiding ring composed of stainless steel wires has a large deformation tolerance space for the viscoelastic cylindrical freshly fermented dough, so as not to block the free sliding of the freshly fermented dough. When the freshly fermented dough forming machine is a multi-head freshly fermented dough forming machine, the freshly fermented dough guiding rings also correspond to multiple rows arranged side by side, which can greatly improve the production efficiency and filling efficiency.

[0007] Step 3: Tamping the fresh leavened dough. The composite paper cans filled with fresh leavened dough on the flexible conveyor belt are guided by the guiding guardrails to the linear vibrating feeder on one side of the flexible conveyor belt. Through the continuous tossing of the composite paper cans by the linear vibrating feeder, the fresh leavened dough in the composite paper cans is tamped. The purpose is to enable the fresh leavened dough to completely fall into and fully fill the composite paper cans, and at the same time, the air remaining in the composite paper cans can be discharged. Since the diameter of the fresh leavened dough can only be smaller than the inner diameter of the composite paper cans to be filled into the composite paper cans, and the volume of the fresh leavened dough needs to be the same as the volume of the composite paper cans, the length of the fresh leavened dough needs to be greater than the height of the composite paper cans. Therefore, it is necessary to vibrate and tamp the composite paper cans filled with fresh leavened dough in advance before sealing and packaging the composite paper cans. In order for the fresh leavened dough to be filled into the composite paper cans, its packaging, and the volume of the fresh leavened dough to be the same as that of the composite paper cans, it is inevitable that the diameter of the fresh leavened dough is smaller than the inner diameter of the composite paper cans, and the length of the fresh leavened dough is greater than the height of the composite paper cans. After the fresh leavened dough is filled into the composite paper cans, the top of the fresh leavened dough will be higher than the top of the composite paper cans, which will cause the subsequent sealing of the can lids to be impossible. Therefore, it is necessary to use the method of vibrating and tamping to make the fresh leavened dough exactly fill the composite paper cans. The vibrating and tamping device is realized by using a linear vibrating feeder that can adjust the frequency and amplitude. The linear vibrating feeder can not only tamp the fresh leavened dough but also continuously convey the composite paper cans filled with fresh leavened dough forward.

[0008] (Guiding guardrails are respectively arranged on both sides of the flexible conveyor belt to guide the composite paper cans filled with fresh leavened dough to pass through the linear vibrating feeder; after the composite paper cans filled with fresh leavened dough are tamped by the linear vibrating feeder, the guiding guardrails guide the tamped fresh leavened dough and the composite paper cans back to the flexible conveyor belt; and continue to move forward along with the flexible conveyor belt to reach the workstations such as capping and outer packaging of the composite paper cans.)

[0009] In the first step, the composite paper cans to be filled with fresh dough are neatly arranged one by one through a flexible conveyor belt and sent to the atomizing oil spraying station, where an entrance counter, an entrance blocking cylinder, an exit composite paper can sensor and an exit blocking cylinder are provided. According to a preset number N of composite paper cans for atomizing oil spraying (N is a natural number, and the value range of N is 1-15), when the entrance counter recognizes that N composite paper cans have entered the atomizing oil spraying station, the entrance blocking cylinder prevents subsequent composite paper cans from continuing to enter the station, and the exit blocking cylinder also simultaneously prevents the N composite paper cans that have entered the station and are waiting for atomizing oil spraying from leaving the station; the atomizing oil spraying positioning device positions and clamps the N composite paper cans, and the positioning detection sensor detects them to confirm the position of each oil spray gun. There is a composite paper can corresponding to the bottom of each of the N oil spray guns; once it is detected that a composite paper can is missing at a certain position, the PLC program control system will automatically close the valve of the oil spray gun corresponding to the position to prevent the production workshop, machinery and equipment and adjacent spiral paper cans from being sprayed by mistake due to the missing spiral paper can; an oil overflow prevention cover is arranged at the bottom of the N oil spray guns to prevent the atomized oil from overflowing to the outside of the composite paper can and avoid oil pollution to the production environment. The oil overflow prevention cover can be lowered and raised together with the N oil spray guns. When the oil spray gun at the bottom of the oil spray gun is When the nozzle descends to the top position in the composite paper can, the oil overflow prevention cover is just located at the upper end of the composite paper can, which is the lowest limit of the oil overflow prevention cover; the oil spray guns continue to descend in the composite paper cans, and when the oil spray nozzle at the bottom of the oil spray gun reaches the bottom of the composite paper can, the oil spray gun begins to rise upward, and the oil spray nozzle begins to spray oil horizontally from bottom to top, until the oil spray nozzle rises to the upper end of the composite paper can, and the oil spray gun stops spraying oil; after the atomization spraying is completed, the oil spray gun will continue to rise to the specified position, during this process At the same time, the oil overflow prevention cover is lifted to separate the oil overflow prevention cover from the contact with the composite paper can. At this point, the atomizing oil spraying process of the inner walls of N composite paper cans is completed; the PLC program control system releases the clamping of the composite paper can by the atomizing oil spraying positioning device, and simultaneously opens the entrance blocking cylinder and the exit blocking cylinder set at the atomizing oil spraying station. The former allows the next group of N composite paper cans to enter the atomizing oil spraying station, and the latter allows a group of N composite paper cans that have completed the atomizing oil spraying of the inner wall to continue to move forward with the flexible conveyor belt to reach the filling station of the composite paper can.

[0010] In the second step, the fresh dough in the form of a cylindrical dough (the diameter and length of which are precisely made by the fresh dough forming machine) formed by the fresh dough forming machine is filled into the inner part of the composite paper can. At this time, the composite paper can is delivered to the filling station along the flexible conveyor belt, and the filling positioning device will position and clamp the composite paper can; the fresh dough with determined diameter and length will successively fall vertically into the composite paper can to be filled from top to bottom one by one by the fresh dough forming machine (it can be filled singly or multiple at the same time, which depends on whether the fresh dough forming machine is single-head or multi-head); during the filling process, due to the viscoelastic characteristics of the fresh dough, a hyperbolic and waist-drum-shaped fresh dough guiding ring needs to be installed at the lower end of the fresh dough outlet of the fresh dough forming machine to guide the fresh dough to be smoothly filled into the composite paper can. When the fresh dough is filled into the composite paper can, the PLC program control system releases the positioning and clamping of the composite paper can by the filling positioning device, so that the composite paper can filled with fresh dough can continue to move forward along the flexible conveyor belt to be delivered to the compacting station of the fresh dough.

[0011] In the third step, when the fresh dough is filled into the composite paper can, the PLC program control system releases the positioning and clamping of the composite paper can by the filling positioning device, so that the composite paper can filled with fresh dough can continue to move forward on the flexible conveyor belt. And on one side of the flexible conveyor belt in front of the filling station, a linear vibrating feeder as a feeding and compacting device is provided, and through the guiding guardrails arranged on both sides of the flexible conveyor belt, the composite paper can filled with fresh dough is guided to pass over the linear vibrating feeder. The linear vibrating feeder can adopt a digital frequency modulation linear vibrating feeder. This feeding and compacting device can not only compact the fresh dough in the composite paper can continuously under the action of vibration and jolting so that it is completely filled into the composite paper can, but also make the composite paper can filled with fresh dough be automatically and continuously thrown forward. After the composite paper can filled with fresh dough passes through the feeding and compacting device, the guiding guardrails arranged on both sides guide the composite paper can to return to the flexible conveyor belt again and continue to be transported to the subsequent sealing can lid station along the flexible conveyor belt.

[0012] The filling method of the fresh dough of the present invention is an innovation in the filling method of viscoelastic products on an automated production line, and has many advantages such as reasonable process design, simple structure of production equipment, and high production efficiency. It is especially suitable for use in an automated production line for filling fresh dough into composite paper cans. The advantages of this method are reflected in: it makes it possible for the fresh dough with viscoelastic form to be smoothly filled into the composite paper can, can greatly improve the production efficiency and production capacity of the fresh dough, can greatly reduce the labor intensity of the operators on the production line, and can avoid the adhesion phenomenon between the fresh dough and the composite paper can and the hands of consumers. Brief Description of the Drawings

[0013] Figure 1: Schematic diagram of the overall system of the fresh dough filling method of the present invention;

[0014] Figure 2 : Schematic diagram of the fresh dough guiding ring;

[0015] Figure 3 : Top view of the guiding guardrail.

[0016] In the figure: 1. Oil spray gun, 2. Oil spray nozzle, 3. Oil overflow prevention cover, 4. Composite paper can, 5. Atomizing oil spray positioning device, 6. Position detection sensor, 7. Inlet blocking cylinder, 8. Inlet counter, 9. Outlet blocking cylinder, 10. Outlet composite paper can sensor, 11. Fresh dough, 12. Fresh dough forming machine, 13. Fresh dough guiding ring, 14. Filling positioning device, 15. Linear vibratory feeder, 16. Guiding guardrail, 17. Flexible conveyor belt. Specific implementation manner

[0017] Figure 1 This is the schematic diagram of the overall system of the fresh dough filling method of the present invention. Figure 1 In it, the three steps and workstations of "oil spraying", "loading", and "consolidating" are respectively represented by A, B, and C. To simplify the description of the implementation process, in the atomizing oil spraying workstation on the inner wall of the composite paper can in this embodiment, taking N = 5 as an example, that is: the atomizing oil spraying workstation sprays atomized oil on a group of five composite paper cans at a time; and in the fresh dough filling workstation in the embodiment, only one fresh dough is filled at a time. However, such an embodiment does not affect the protection scope of this invention patent.

[0018] In the first step, the inner wall of the composite paper can is atomized and sprayed with oil. The composite paper can 4 for filling fresh dough is sent to the atomized oil spraying station A by the flexible conveyor belt 17. An entrance counter 8 and an entrance blocking cylinder 7 are arranged at the entrance of this station, and an exit composite paper can sensor 10 and an exit blocking cylinder 9 are arranged at the exit of the atomized oil spraying station A. After the composite paper can 4 enters the atomized oil spraying station A, a group of five composite paper cans 4 are positioned and clamped by the atomized oil spraying positioning device 5, and detected by the positioning detection sensor 6 to confirm whether there are indeed five composite paper cans 4 corresponding to the positions below the five oil spray guns 1. If it is detected that one or several composite paper cans 4 are missing at a certain position, the PLC program control system will automatically close the nozzle valves of the oil spray guns 1 at the corresponding positions to prevent the oil spray guns from mis-spraying and causing oil stains on the production workshop, production equipment and other composite paper cans 4. A grease overflow prevention cover 3 is arranged below the oil spray gun 1, and the connection method adopts 4 wire ropes or silica gel tapes made of flexible materials (i.e., grease overflow prevention cover lifting belts). The grease overflow prevention cover 3 descends together with the oil spray gun 1. When the nozzle 2 at the end of the oil spray gun 1 descends to the top of the composite paper can 4, the grease overflow prevention cover 3 just covers and presses on the top of the composite paper can 4 at the same time. At this time, the grease overflow prevention cover lifting belt starts to present a free curling state as the oil spray gun 1 continues to descend. The nozzle 2 at the end of the oil spray gun 1 continues to descend to about 5 - 10 millimeters from the bottom end of the composite paper can 4 and then starts to rise in the reverse direction. During the gradual rising process, the nozzle 2 starts to atomize and spray oil until the nozzle 2 at the end of the oil spray gun 1 reaches about 5 - 10 millimeters from the top of the composite paper can 4 and stops spraying oil; at this time, the grease overflow prevention cover lifting belt returns to the free length state without tension. Along with the oil spray gun 1 continuing to rise back to the designated position, the grease overflow prevention cover lifting belt simultaneously lifts the grease overflow prevention cover 3 and no longer covers and presses on the top of the composite paper can 4. Thus, the atomized oil spraying of the inner walls of this batch of five composite paper cans 4 ends; at this time, the PLC program control system instructs to release the clamping of the composite paper can 4 by the atomized oil spraying positioning device 5, and synchronously activates the entrance blocking cylinder 7 and the exit blocking cylinder 9 arranged at the atomized oil spraying station A. The former allows the next group of five composite paper cans 4 to enter the atomized oil spraying station A, and the latter allows a group of five composite paper cans that have completed the inner wall atomized oil spraying to leave the atomized oil spraying station A along with the flexible conveyor belt 17 and be delivered to the filling station B of the composite paper can 4.

[0019] In the second step, the filling of the fresh leavened dough, that is, filling the fresh leavened dough into the composite paper can 4. When the composite paper can 4 reaches the filling station B, the filling positioning device 14 positions and clamps the composite paper can 4; the fresh leavened dough 11 rolled and cut by the fresh leavened dough forming machine vertically falls into the composite paper can 4 from above the composite paper can 4. It is precisely because the diameter of the fresh leavened dough made by the fresh leavened dough forming machine 12 is slightly smaller than the inner diameter of the composite paper can 4, plus the inner wall of the composite paper can 4 has been atomized and sprayed with oil in advance, and a fresh leavened dough guiding ring 13 made of stainless steel wire is provided at the lower end of the fresh leavened dough forming machine 12, so the fresh leavened dough 11 can be smoothly filled into the composite paper can 4. In the embodiment, there are 6 stainless steel wires in the longitude direction of the fresh leavened dough guiding ring 13, and 3 stainless steel wires in the latitude direction. The stainless steel wires in the latitude direction are welded outside the stainless steel wires in the longitude direction to avoid blocking the downward sliding of the fresh leavened dough 11; it is also because the length of the fresh leavened dough 11 filled into the composite paper can 4 will be greater than the height of the composite paper can 4, so it is necessary to enter the next tamping station C to tamp the fresh leavened dough 11 to fill the composite paper can 4.

[0020] In the third step, the tamping of the fresh leavened dough. After the fresh leavened dough 11 is filled into the composite paper can 4, the PLC program control system releases the positioning and clamping of the composite paper can 4 by the filling positioning device 14, so that the composite paper can 4 can continue to move forward on the flexible conveyor belt 17 to the tamping station C of the fresh leavened dough 11. On one side of the flexible conveyor belt 17 close to the front of the fresh leavened dough filling station B, a linear vibrating feeder 15 is provided. Guide guardrails 16 are provided along both sides of the flexible conveyor belt 17 and the linear vibrating feeder 15 to guide the composite paper can 4 filled with the fresh leavened dough 11 to pass through the linear vibrating feeder 15. The frequency- and amplitude-adjustable linear vibrating feeder 15, on the one hand, can, under the action of vibration and jolting, tamp the fresh leavened dough 11 continuously and fill it perfectly into the composite paper can 4, while minimizing the air residue in the composite paper can 4 (as shown in the schematic diagram in Figure 1 , the fresh leavened dough 11 in the composite paper can 4 at the rear of the linear vibrating feeder 15 has been completely tamped into the composite paper can 4); on the other hand, it can also continuously and automatically throw the composite paper can 4 located on it forward. After the tamping process by the linear vibrating feeder 15, the guide guardrail 16 guides the composite paper can 4 back to the flexible conveyor belt 17. The composite paper can 4 filled with the tamped fresh leavened dough is conveyed along the flexible conveyor belt 17 to the subsequent sealing end cap and outer packaging station.

[0021] So far, the three steps of filling the fresh leavened dough 11 into the composite paper can 4 have been completed, and atomized oil spraying is carried out before filling, and tamping is carried out after filling.

[0022] Figure 2The fresh dough guide ring 13 is a schematic diagram of the fresh dough guide ring. The fresh dough guide ring 13 is composed of a plurality of stainless steel wires in a hyperbolic and waist drum shape to reduce the friction and adhesion between the stainless steel plate and the fresh dough when the guide funnel is used. The height of the fresh dough guide ring 13 can be 1 / 4 of the height of the composite paper can. 1 / 4- 1 / 2; the diameter of the thinnest part in the middle of the fresh dough guide ring 13 is slightly larger than the diameter of the fresh dough 11; the diameters of the two ends of the hyperboloid and waist drum-shaped fresh dough guide ring 13 are close to the inner diameter of the composite paper can 4. The diameter of the stainless steel wire of the fresh dough guide ring 13 is between 3 and 8 mm; the stainless steel wire mesh of the hyperboloid and waist drum-shaped fresh dough guide ring 13 is reduced as much as possible, the number of roots in the latitude direction is between 3 and 5 (3 in this embodiment), and the number of roots in the longitude direction is between 3 and 8 (6 in this embodiment), and the stainless steel wire in the latitude direction is welded to the outside of the stainless steel wire in the longitude direction to avoid blocking the fresh dough 11 from sliding down. According to the different models of the fresh dough forming machine 12 used in the production line, when the fresh dough forming machine 12 is a multi-head model, the fresh dough guide ring 13 can also be matched with a plurality of side-by-side methods to improve production efficiency and filling efficiency.

Claims

1. A method for filling fresh fermented dough, according to the sequence of the fresh fermented dough filling process flow, includes three steps: atomized oil spraying on the inner wall of a composite paper can, filling of fresh fermented dough, and tamping of fresh fermented dough. The first step, atomized oil spraying on the inner wall of the composite paper can, is to atomize and spray edible oil on the inner wall of the composite paper can to be filled with fresh fermented dough, so as to avoid the phenomenon of adhesion between the fresh fermented dough and the inner wall of the composite paper can during the subsequent process of filling the fresh fermented dough into the composite paper can. The second step, filling of fresh fermented dough, is to fill the fresh fermented dough into the composite paper can that has been atomized and sprayed with edible oil; the fresh fermented dough is a cylindrical dough rolled by a fresh fermented dough forming machine, and the packaging composite paper can is also cylindrical. The diameter of the fresh fermented dough is slightly smaller than the diameter of the composite paper can, and the length of the fresh fermented dough is slightly greater than the length of the composite paper can, while the volume of the fresh fermented dough is equivalent to the volume of the composite paper can. The fresh fermented dough is filled into the composite paper can one by one from the upper opening of the composite paper can. The third step, tamping of fresh fermented dough, is to tamp the fresh fermented dough filled into the composite paper can. The composite paper can filled with fresh fermented dough is guided to a linear vibrating feeder on one side of the flexible conveyor belt through the guiding guardrails on both sides of the flexible conveyor belt. The linear vibrating feeder continuously throws the composite paper can on it forward and upward, not only tamping the fresh fermented dough and exhausting the air remaining in the composite paper can so that it completely falls into the composite paper can, but also moving the composite paper can forward. The composite paper can is guided back to the flexible conveyor belt through the guiding guardrails for can sealing and packaging at subsequent workstations.

2. The filling method of a fresh dough according to claim 1, characterized in that, In the first step, the composite paper cans to be filled with fresh dough are neatly arranged one by one through a flexible conveyor belt and sent to the atomizing and oil spraying station. An entrance counter and an entrance blocking cylinder are provided at the entrance of the station, and an exit blocking cylinder is provided at the exit of the station. According to the preset number N of composite paper cans to be atomized and oil sprayed, when the entrance counter recognizes that a group of N composite paper cans have entered the atomizing and oil spraying station, the entrance blocking cylinder prevents subsequent composite paper cans from continuing to enter the station, and the exit blocking cylinder synchronously prevents the group of N composite paper cans that have entered the station and are waiting for atomization and oil spraying from leaving the station. The atomized oil spray positioning device positions and clamps a group of N composite paper cans, and detects them through the positioning detection sensor to confirm whether there is a composite paper can under each spray gun position; once it is detected that a composite paper can is missing at a certain position, the PLC program control system will automatically close the spray gun valve corresponding to the position to prevent the production workshop, machinery and equipment and adjacent spiral paper cans from being sprayed by mistake due to the lack of spiral paper cans; an oil overflow prevention cover is set at the bottom of the N spray guns to prevent the atomized oil from overflowing to the outside of the composite paper cans, avoiding damage to the production environment The oil spill prevention cover can descend and ascend together with the N oil spray guns. When the oil spray nozzle at the bottom of the oil spray gun descends to the top position in the composite paper can, the oil spill prevention cover is just located at the upper end of the composite paper can, which is the lowest limit of the oil spill prevention cover. The N oil spray guns continue to descend in the N composite paper cans respectively. When the oil spray nozzle at the bottom of the oil spray gun reaches the bottom position in the composite paper can, the oil spray gun starts to rise. At this time, the oil spray nozzle starts to spray oil in atomization in the surrounding horizontal direction from bottom to top until the oil spray nozzle rises to the top of the composite paper can, and the oil spray gun stops spraying oil in atomization. After that, the oil spray gun will continue to rise to the designated position, and in the process, the oil overflow prevention cover will be lifted at the same time to make the oil overflow prevention cover separate from the contact with the composite paper can; at this point, the atomizing oil spraying process of the inner wall of a group of N composite paper cans is completed; the PLC program control system releases the clamping of the composite paper can by the atomizing oil spraying positioning device, and simultaneously opens the entrance blocking cylinder and the exit blocking cylinder set at the atomizing oil spraying station, the former allows the next group of N composite paper cans to enter the atomizing oil spraying station, and the latter allows a group of N composite paper cans that have completed the atomizing oil spraying of the inner wall to continue to move forward with the flexible conveyor belt to be delivered to the filling station of the composite paper can.

3. A method for filling fresh leavened dough according to claim 1, characterized in that, In the second step, the fresh leavened dough formed into a cylindrical shape by the fresh leavened dough forming machine is filled into the inner part of the composite paper can; at this time, the composite paper can is delivered to the filling station along the flexible conveyor belt, and the filling positioning device positions and clamps the composite paper can; the fresh leavened dough successively falls vertically from top to bottom one by one from the outlet of the fresh leavened dough forming machine into the composite paper can to be filled; during the process of filling the fresh leavened dough into the inner part of the composite paper can, due to the viscoelastic characteristics of the fresh leavened dough, a fresh leavened dough guiding ring similar to the function of a filling funnel needs to be arranged at the lower end of the outlet of the fresh leavened dough forming machine to assist the fresh leavened dough to be smoothly filled into the composite paper can; when the fresh leavened dough is filled into the composite paper can, the PLC program control system releases the positioning and clamping of the composite paper can by the filling positioning device, so that the composite paper can filled with fresh leavened dough can continue to move forward along the flexible conveyor belt to reach the compacting station of the fresh leavened dough.

4. A method for filling a fresh dough as claimed in claim 1, characterized in that, In the third step, the fresh leavened dough filled into the composite paper can is compacted; on one side of the flexible conveyor belt in front of the filling station, there is a linear vibrating feeder arranged; the composite paper can filled with fresh leavened dough delivered by the flexible conveyor belt is guided to the linear vibrating feeder on one side of the flexible conveyor belt through the guiding guardrails on both sides of the flexible conveyor belt, and the linear vibrating feeder continuously throws the composite paper can on it forward and upward, which can not only deliver the composite paper can to continue to move forward, but also play a role in compacting the fresh leavened dough filled into the composite paper can to remove the air remaining in the composite paper can and make the fresh leavened dough completely fall into the composite paper can; after the fresh leavened dough is compacted, the composite paper can is guided back to the flexible conveyor belt through the guiding guardrail and continues to move forward along the flexible conveyor belt to reach the subsequent station for sealing and packaging the composite paper can.

5. A method for filling fresh dough according to claim 2, characterized in that, The number N of the composite paper cans for a group of atomized oil spraying refers to the number of composite paper cans for atomized oil spraying in the same batch; N is a natural number, and its value range is 1 - 15.

6. A method for filling a fresh dough according to claim 2, characterized in that, The bottom of the oil spray nozzle at the bottom of the oil spray gun reaches the bottom position of the composite paper can, which means that the oil spray nozzle descends to a position 5 - 10 millimeters away from the bottom of the composite paper can and starts spraying oil; until the oil spray nozzle rises to the top of the composite paper can, which means that until the oil spray nozzle gradually rises to a position 5 - 10 millimeters above the top of the composite paper can and stops spraying oil.

7. A method for filling a fresh dough according to claim 3, characterized in that, When the fresh leavened dough made by the fresh leavened dough forming machine successively falls vertically from top to bottom one by one into the composite paper can to be filled, it can be filled individually or multiple at the same time, which depends on whether the fresh leavened dough forming machine is of single-head function or multi-head function.

8. A method for filling fresh dough according to claim 3 or 7, characterized in that, The fresh leavened dough guiding ring is composed of a hyperbolic and waist-drum-shaped shape formed by several stainless steel wires in the longitude and latitude directions to reduce the friction and adhesion generated with the fresh leavened dough when using a stainless steel plate as a filling funnel.

9. A method for filling a fresh dough according to claim 3 or 7, characterized in that, The diameters at both ends of the hyperboloid and waist-drum-shaped fresh dough guiding ring are close to the inner diameter of the composite paper tube. The thinnest inner diameter in the middle of the fresh dough guiding ring is slightly larger than the diameter of the fresh dough. The height of the fresh dough guiding ring can be 1 / 4 - 1 / 2 of the height of the composite paper tube; the diameter of the stainless steel wire of the fresh dough guiding ring is between 3 - 8 mm; the number of wires in the longitude and latitude directions of the stainless steel wire mesh of the fresh dough guiding ring is: the number of wires in the latitude direction is 3 - 5, and the number of wires in the longitude direction is 3 - 8; the stainless steel wires in the latitude direction are welded outside the stainless steel wires in the longitude direction to avoid blocking the sliding of the fresh dough.

10. A method for filling a fresh dough according to claim 7, characterized in that, When the fresh dough forming machine is a multi-head model, multiple fresh dough guiding rings are also required.

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