Snack food 3D printing and shaping device based on double materials and three nozzles and application of snack food 3D printing and shaping device

Abstract

The invention relates to a snack food 3D printing device based on double materials and three nozzles and application of the snack food 3D printing device, and belongs to the technical field of food processing and equipment manufacturing. A double-material double-nozzle 3D printing system and a single-nozzle auxiliary gel system are arranged in the printing platform system; the air supply system is connected with the double-material double-nozzle 3D printing system and the single-nozzle auxiliary gel system through pipelines. A conveying system is further arranged in the printing platform system and connected with the physical field auxiliary drying system. According to the preparation method, collaborative technologies such as double-material combined gel, double-nozzle 3D printing, single-nozzle dehydration coagulation acceleration and physical field curing or drying are adopted, the leisure hawthorn product processing problems that a nozzle of single-nozzle 3D printing is prone to blockage, double-nozzle 3D printing is prone to collapse, the printing efficiency is low, and a printed product is simple in shape are solved, the application range of the 3D printed product is widened, and the production cost is reduced. And a technical support is provided for development of specially-shaped haw snacks.

Description

Technical Field

[0001] The invention relates to a 3D printing snack modeling device based on dual materials and three nozzles and application thereof, belonging to the technical field of food processing and equipment manufacturing. Background Art

[0002] Hawthorn belongs to the Rosaceae family and is rich in pectin, dietary fiber, minerals, vitamins and other nutrients. It is widely used in food processing. Hawthorn fruit can be eaten directly, and is also made into snack foods such as hawthorn strips, hawthorn slices, hawthorn candies, and hawthorn cakes. Hawthorn dried products are sweet and sour, and have the effects of appetizing, strengthening the spleen, and treating indigestion, so they are favored by consumers. Due to the high pectin content in hawthorn fruit, the total sugar content of hawthorn sauce ingredients used to make hawthorn products must reach more than 65% to form a gel structure, which is conducive to molding and cutting. However, gel is not conducive to the migration of water during the drying process of hawthorn products, resulting in problems such as long drying cycle, high energy consumption, high cost, and loss of nutrients. In addition, the traditional mold preparation method also causes the hawthorn dried products to have simple shapes and lack of visual impact. In recent years, with the change of people's dietary concepts, hawthorn products with characteristics such as health, nutrition, pleasure, and personalization have become the development trend of leisure hawthorn snacks. Therefore, the development of leisure hawthorn snacks with characteristics such as low sugar, special shapes, and high nutrition has become a hot spot in the research of hawthorn products.

[0003] 3D printing technology is called rapid prototyping technology or additive manufacturing technology. It mainly controls complex production processes through digital operations to achieve personalized product development. It has significant advantages such as high precision, fast speed, low cost, and simple operation. It has been promoted and applied in the fields of machinery, medicine, chemical industry, electronics, and aviation. In recent years, 3D printing technology has begun to be applied to personalized food development, such as easy-to-swallow foods for the elderly, special-shaped children's snack foods, and adult favorite foods. However, due to the high moisture content and poor support of the ingredients, the products are prone to collapse, low precision, and low efficiency during the printing process, resulting in limited application scenarios and scale. Some researchers improve the printability of ingredients by adding auxiliary materials such as milk powder, colloids, and starch. However, too many auxiliary materials will change the composition of the ingredients, which will not only affect the quality of the product itself, but also limit the application scenarios and can only be used for fresh food. In addition, the addition of high-content auxiliary materials (colloids) also causes the printed products to shrink severely in volume after drying, increase hardness, and are difficult to apply to the processing of leisure dry products.

[0004] At present, the preparation of leisure hawthorn dried products is based on the combined gel mechanism of pectin and sucrose and the hot air drying method. The combined gel makes hawthorn ingredients supportive and conducive to molding and cutting, but it also causes the problem of nozzle clogging during the printing process. At the same time, hot air drying also causes the hawthorn products to have a long drying cycle and lose nutrients and functional components. According to the combined gel mechanism of pectin and sucrose, the dual-material dual-nozzle 3D printing technology is used to alternately print thin layers of pectin solution and sucrose solution and interpenetrate gel, which is an effective method to solve the nozzle clogging in the printing process of the ingredients of special-shaped leisure hawthorn snacks. In addition, some studies have shown that physical field-assisted drying can promote the phase change of ingredients or the phase change of ingredients, improve the strength of gel, and become an effective method to improve the support of food 3D printing structure, while shortening the drying time and reducing the loss of nutrients and functional components. Therefore, dual-nozzle 3D printing based on dual-material combined gel and coordinated physical field-assisted drying is an effective method for developing special-shaped leisure hawthorn snacks.

[0005] Hu Qiuhui et al. (application number: CN202111415144.X) disclosed a Flammulina velutipes polysaccharide-soy protein gel suitable for 3D printing and its preparation method. This patent uses Flammulina velutipes polysaccharide and soy protein as raw materials, and prepares a composite protein gel by mixing and heating to improve the accuracy of 3D printing. The difference of this patent is that it utilizes the gel formation mechanism of hawthorn pectin and sucrose, adopts dual-material dual-nozzle 3D printing and physical field coagulation technology, improves the internal structural support of the product during the printing process, thereby improving the printing accuracy and developing special-shaped leisure hawthorn snacks.

[0006] Feng Lei et al. (application number: CN202110910768.2) disclosed a 3D printed yam health food and its preparation method. The patent is to pre-treat the yam with microwave drying, and prepare a printable yam gel by mixing it with hydrophilic colloids, citric acid, etc., retaining the nutritional components of the yam, but the printed product of the patent is suitable for fresh consumption. The difference of this patent is that the special shape of leisure dried hawthorn snacks is developed by synergizing the dual-material dual-nozzle printing combination gel with physical field assisted drying technology.

[0007] Lv Weiqiao et al. (application number: CN202310503152.2) disclosed a food processing device and a food 3D printing processing system. The food processing device provided by the patent can freeze the food and perform subsequent vacuum dehydration during the food 3D printing process. The difference of this patent is that it adopts dual-material dual-nozzle printing combined gel and physical field assisted drying technology. While the dual materials are alternately printed, the printed product is subjected to coagulation treatment to improve the internal structure support capacity of the printed product, which is suitable for the preparation of special-shaped hawthorn snacks.

[0008] Guo Chaofan et al. (application number: CN202211083792.4) disclosed a 3D printed minced meat composition and its preparation method. This patent is used to reduce the loss of fat and juice during meat processing, better maintain the flavor of the product, and is suitable for preparing 3D printed fresh products. The difference of this patent is that a special-shaped leisure dried hawthorn snack is developed through the collaborative method of double-material double-nozzle alternating printing combined gel and physical field assisted drying technology.

[0009] Zheng Bo et al. (application number: CN202210814604.4) disclosed a processing method for preparing digestion-resistant starch by heat treatment and 3D printing. The patent selects lipids and polyphenols as dual ligands, and uses heat treatment to 3D print starch complexes. The method is simple and improves product quality. The difference of this patent is that it uses a dual-material dual-nozzle alternating printing gel and a physical field-assisted drying technology synergistic method to shorten the drying cycle, reduce nutrient loss, and speed up the gelation speed to obtain a hawthorn snack with a special shape.

[0010] Zhang Min et al. (application number: CN202210004826.X) disclosed a method for synchronous 3D printing of easy-to-swallow stuffed buns that meet aerospace requirements. This patent applies microwave-assisted food dual-nozzle 3D printers in a microgravity environment to make buns, and uses flour and whey protein powder as the main raw materials, and improves swallowability by adding gellan gum. The difference of this patent is that it uses dual-material dual-nozzle alternate printing of gel and coagulation nozzles and physical field assisted drying methods to improve the structural support and printing efficiency of 3D printed products, and develop special-shaped hawthorn snacks.

[0011] Su Xin et al. (application number: CN202320699533.8) disclosed a 3D food printer with coaxial dual nozzles. This patent can simultaneously print composite structure foods containing two different materials, improving printing efficiency and accuracy, but the printed product structure of this patent has poor support and is prone to collapse, and cannot print special shaped foods. The difference of this patent is that it uses dual-material dual nozzles to alternately print gel and coagulation nozzles and physical field assisted drying methods to improve the structural support of special shaped 3D printed foods.

[0012] Hu Yang et al. (application number: CN202411025106.7) disclosed a 3D food printing method using dual-nozzle technology to achieve dual-color materials. The patent uses a high internal phase emulsion gel containing xanthan gum as a texture modifier to improve the printability and chewing and swallowing of pea protein gel, and successfully constructs a steak texture model. The difference of this patent is that no auxiliary colloid is added, and dual nozzles and dual materials are used to alternately print to produce gel, the gel is accelerated by the coagulation nozzle, and the curing and drying of the printed product are accelerated by physical field assisted drying, and a special shape of leisure hawthorn snacks is developed.

[0013] Su Hyun Lee et al. used a single-nozzle single-axis 3D printing method to study the preparation of fiber foods (FoodResearch International). The study used fish paste ingredients and plant ingredients and 3D printing methods to prepare fiberized foods, and cooked them after processing to mature and improve support. The difference of this patent is that it uses a dual-material dual-nozzle alternating printing and a coagulation nozzle method to perform gel strengthening in the same path while alternately printing dual ingredients, improving the structural support of the printed product online, and using physical field assisted drying for post-processing of the printed product to ensure rapid dehydration, curing and drying of the printed product. Therefore, this patent can achieve the printing of more complex and special structure products.

[0014] Kong Demei and others used dual-nozzle 3D printing to study the fillings of easy-to-swallow Qingtuan (Food Research International). By adding different proportions of soluble soybean polysaccharides, the gelatinization and regeneration behavior of glutinous rice starch were improved, and the texture of the printed products was improved by structural adjustment. However, the 3D printed products in this study can only be used for fresh food, and the printed products are simple in shape. The difference of this patent is that it uses dual-material dual-nozzle alternating printing of gel, single-nozzle coagulation and physical field assisted drying methods to improve the structural support of 3D printed products and develop fresh hawthorn and dried hawthorn snacks with special shapes.

[0015] Zhang Peilun and others used hot melt extrusion dual nozzle 3D printing technology (International Journal of Pharmaceutics) to study the preparation of sustained-release tablets using caffeine as a model compound, and developed three different shapes of sustained-release tablets. The difference of this patent is that it uses the gelation mechanism of pectin and sucrose, and adopts a dual-material dual nozzle alternate printing gel and a coagulation nozzle and physical field assisted drying method to improve the structural support of the printed product. At the same time, the printed product has a low drying temperature and less loss of nutrients, which is suitable for the preparation of complex and special shape leisure hawthorn snacks.

[0016] In short, due to the high water content of fruit ingredients, the product structure support in the 3D printing process is poor, easy to collapse, and the printing accuracy is low. Although adding auxiliary materials (colloids, starch, etc.) can improve the printing characteristics, the application scenarios are limited and can only be mainly fresh food, which limits the application of 3D printing technology in the preparation of special shaped foods. The present invention utilizes the gel formation mechanism of the combination of pectin and sucrose, adopts dual-material dual-nozzle alternating printing and a coagulation nozzle method, and performs gel strengthening in the same path while alternating printing of dual ingredients, improves the structural support of the printed product online, and uses physical field assisted drying for post-processing of the printed product to ensure rapid dehydration, curing and drying of the printed product, which can realize the printing of more complex special structure products. Therefore, this patent makes up for the defects of 3D printing technology in the preparation of special shaped foods. At present, there are no reports at home and abroad on the preparation device of special shaped hawthorn snacks based on dual-material combination gel and three-nozzle 3D printing and its application. Summary of the invention

[0017] The purpose of the present invention is to overcome the above-mentioned shortcomings, and to provide a 3D printing snack device based on dual materials and three nozzles and its application, which utilizes the dual-material combined gel mechanism, adopts dual-material dual-nozzle 3D alternating printing, and simultaneously performs single-nozzle hot air dehydration and coagulation in the same path, and improves the sample structure support strength of the 3D printing process online. At the same time, the printing process can realize more complex special model printing through rapid solidification by physical field, and after printing, it is quickly dried by physical field to further solidify the printed hawthorn product shape to meet the moisture content requirements. The present invention solves the problem of nozzle blockage in the single-nozzle printing process of leisure hawthorn dry product ingredients, and realizes the efficient and high-quality creation of special-shaped leisure hawthorn snack products.

[0018] The technical solution of the present invention is a 3D printing modeling snack device based on dual materials and three nozzles, which includes a printing platform system, a dual-material dual-nozzle 3D printing system, a single-nozzle auxiliary gel system, an air supply system, a conveying system, a physical field assisted drying system and a control system; the printing platform system is provided with a dual-material dual-nozzle 3D printing system and a single-nozzle auxiliary gel system; the air supply system is connected to the dual-material dual-nozzle 3D printing system and the single-nozzle auxiliary gel system through pipelines respectively; the printing platform system is also provided with a conveying system, and the conveying system is connected to the physical field assisted drying system; the dual-material dual-nozzle 3D printing system, the single-nozzle auxiliary gel system, the air supply system, the conveying system and the physical field assisted drying system are controlled by the control system.

[0019] Furthermore, the printing platform system includes a frame, a printing platform, a printing tray and a nozzle fixing member; the frame is hollow, and a printing platform is arranged inside, and a printing tray is arranged on the printing platform; the frame is also provided with a nozzle fixing member;

[0020] The dual-material dual-nozzle 3D printing system comprises a base material printing nozzle and an auxiliary material printing nozzle, a pipeline and a reversing valve; the front ends of the base material printing nozzle and the auxiliary material printing nozzle are assembled on the nozzle fixing member, and the rear ends of the base material printing nozzle and the auxiliary material printing nozzle are connected to the air supply system through pipelines; the pipelines are provided with reversing valves;

[0021] The single-nozzle auxiliary gel system includes a coagulation-promoting nozzle and a solenoid valve; the coagulation-promoting nozzle is located between the substrate printing nozzle and the auxiliary material printing nozzle, and is also assembled on the nozzle fixing member; the tail of the coagulation-promoting nozzle is also connected to the air supply system through a pipeline; the pipeline is provided with a solenoid valve;

[0022] The gas supply system includes a pressure regulating valve, a pressure reducing valve and a high-pressure gas tank; a pressure reducing valve is provided at the front end of the high-pressure gas tank; the substrate printing nozzle, the coagulation-promoting nozzle and the auxiliary material printing nozzle are all connected to the high-pressure gas tank through pipelines; a pressure reducing valve is provided on each of the connected pipelines;

[0023] The physical field assisted drying system comprises a drying box, a lifting mechanism, an infrared heater, a sealed door, a microwave generator and a circulating fan; the drying box can move up and down along the lifting mechanism; the drying box is provided with an infrared heater, a microwave generator and a circulating fan; and a sealed door is also provided at the bottom of the drying box;

[0024] The conveying system includes a conveying cylinder and a guide rail; the guide rail specifically includes a guide groove located on the printing platform and a guide groove located on the sealing door, and the two are spliced ​​together to form a complete guide rail; the printing tray can move back and forth on the printing platform and the sealing door along the guide rail by pushing and pulling the push rod in the conveying cylinder.

[0025] Furthermore, the guide groove in the sealed door is made of non-metallic material.

[0026] The control system mainly includes a control cabinet, through which other systems are controlled. Specifically, the control cabinet controls the conveying cylinder, X-axis drive device, substrate printing nozzle, auxiliary material printing nozzle, Z-axis drive device, infrared sensor, Y-axis drive device, reversing valve, solenoid valve, lifting mechanism, infrared transmitter, microwave generator, circulating fan, optical fiber sensor, electric heating tube and thermocouple.

[0027] Furthermore, the printing platform system also includes a Z-axis drive device; the printing platform is installed in the Z-axis direction, and the Z-axis drive device controls the vertical movement of the printing platform; the printing tray is driven by a conveying cylinder to move along a guide rail between the printing platform and the physical field assisted drying system.

[0028] Furthermore, the printing tray is made of microwave-resistant material and is designed with a positioning function.

[0029] The printing platform system also includes an X-axis driving device and a Y-axis driving device; the nozzle fixing part is controlled by the X-axis driving device and the Y-axis driving device to move in the X-axis and Y-axis planes; the substrate printing nozzle, the coagulation promoting nozzle and the auxiliary material printing nozzle are all installed on the nozzle fixing part through the thread holes.

[0030] Furthermore, the internal structure of the substrate printing nozzle and the auxiliary material printing nozzle specifically includes a food extrusion tube, a support tube and a cylinder. The food of the two nozzles is evenly extruded by cylinder extrusion. The cylinder is connected to the high-pressure gas tank through a reversing valve, a pressure regulating valve and a pressure reducing valve.

[0031] An infrared sensor is also arranged below the nozzle fixing part.

[0032] The pro-coagulation nozzle includes an air nozzle, an insulation tube, an electric heating tube and a thermocouple; the air nozzle is fixed to the inner thread of the insulation tube through an external thread; the electric heating tube is installed inside the insulation tube, and the thermocouple is installed on the inner wall of the insulation tube, and the electric heating tube and the thermocouple are connected to the control cabinet through a control line; the upper part of the insulation tube is connected to the high-pressure gas tank through a solenoid valve, a pressure regulating valve and a pressure reducing valve.

[0033] A second guide groove is provided in the drying chamber of the physical field assisted drying system. The second guide groove is made of non-metallic material. The drying chamber moves up and down through a lifting mechanism to allow the material tray to enter and exit. The drying chamber inlet and outlet door is designed at the bottom, and microwave sealing of the drying chamber is achieved through a sealing cover.

[0034] The physical field assisted drying system also includes an infrared emitter, which is located at the top of the drying chamber. The connecting plate between the infrared emitter and the top of the drying chamber is a mesh plate with a diameter less than 2 mm. An infrared tube is installed in the infrared heater.

[0035] The microwave generator is installed on the microwave feed port on the side of the drying chamber through the excitation cavity; the circulating fan is installed on the side of the drying chamber and connected to the infrared heater;

[0036] An optical fiber sensor 25 is also installed on the drying chamber.

[0037] Another technical solution of the present invention is to use a 3D printing snack device based on dual materials and three nozzles; the specific steps are as follows:

[0038] (1) Preparation of dual-nozzle 3D printing food: prepare the base material printing nozzle food and load it into the base material printing nozzle extrusion tube; prepare the auxiliary material printing nozzle food and load it into the auxiliary material printing nozzle extrusion tube;

[0039] (2) Dual-material three-nozzle 3D printing: the substrate extrusion tube is placed in the substrate printing nozzle support tube, and the auxiliary material extrusion tube is placed in the auxiliary material printing nozzle support tube; turn on the control cabinet power, start the industrial computer, import the printing model, print the nozzle number, select the slicing software, slice, modify the slicing program, and insert the accelerator nozzle running program; set the substrate printing nozzle, auxiliary material printing nozzle, and accelerator nozzle running parameters; start the running program, print and shape, and obtain a three-nozzle 3D printed sample placed on the printing tray;

[0040] Furthermore, the dual-material dual-nozzle printing model is completed by alternately printing the substrate printing nozzle and the auxiliary material printing nozzle, and the printing layer height range of the substrate printing nozzle and the auxiliary material printing nozzle is 0.8-5.0 mm; the three-nozzle printing nozzle numbering refers to setting the substrate printing nozzle as nozzle 1, the auxiliary material printing nozzle as nozzle 2, and the accelerator nozzle as nozzle 3; the modified slicing program, inserting the accelerator nozzle operation program, refers to that after nozzle 1 and nozzle 2 are alternately printed, nozzle 3 runs according to the path of nozzle 2, and nozzle 3 ends its operation, and nozzle 1 and nozzle 2 continue to print alternately, and then nozzle 3 runs according to the path of nozzle 2, and nozzle 1, nozzle 2, and nozzle 3 run in sequence until the printing is completed; the hot air is turned on when nozzle 3 is running, and the hot air is stopped when it stops running;

[0041] Furthermore, the three-nozzle 3D printing parameters are set as follows: the substrate printing nozzle temperature is 25-30°C, the printing speed is 10-15mm / s, and the cylinder pressure is 0.1-0.15MPa; the auxiliary material printing nozzle temperature is 25-30°C, the printing speed is 8-10mm / s, and the cylinder pressure is 0.1-0.15MPa; the accelerator nozzle printing speed is 0-10mm / s, the outlet temperature is 60-70°C, the wind speed is 0-2m / s, and the inlet pressure is 0.1-0.15MPa;

[0042] (3) Physical field assisted drying: the printing platform is lowered to the lowest position, the conveying cylinder in the conveying system is started, the printing tray containing the printed sample is moved into the second guide groove of the drying chamber through the guide rail, the optical fiber sensor is inserted into the printed sample, the lifting mechanism is started, and the drying chamber moves down to contact the sealing plate; the circulating fan, infrared heater and microwave generator are turned on to cure or dry the printed sample;

[0043] Furthermore, the physical field assisted drying parameters are as follows: infrared heater power 500W, adjustment range 0-100%; microwave power 700W, adjustment range 10-100%; the maximum temperature of the printed sample is 60°C, the temperature control is 4 sections, namely 30°C, 40°C, 50°C and 60°C, and the corresponding microwave powers are 100%, 75%, 50%, 25%, and the operating time setting range is 0 to 60h;

[0044] (4) Continue printing / product packaging: After the physical field assisted drying is completed, the elevator is started, the drying chamber moves up and separates from the sealing plate, the conveying system is started, the material tray moves to the printing platform, and printing continues according to the design program, or after printing is completed, the printed sample is taken out and packaged in an aluminum foil bag.

[0045] The method for preparing the food material for the substrate printing nozzle in step 1 is as follows: sorting, washing, removing stems, removing cores, protecting colors, steaming, pulping and filtering fresh hawthorns to obtain hawthorn pulp; mixing the hawthorn pulp with sucrose according to a formula ratio to obtain hawthorn jam;

[0046] Furthermore, the color protection liquid of the substrate printing nozzle food preparation method is 10-20g / L NaCl solution, the soaking time is 3-5min, the cooking temperature is 100°C, the time is 10-15min, the screen is 40-60 mesh, and the weight ratio of hawthorn pulp: sucrose is 1:0.40-0.35;

[0047] The auxiliary material printing nozzle food preparation method comprises: sorting, washing, peeling or removing the core, protecting the color, beating, and filtering fresh fruits to obtain pulp; mixing the pulp, sucrose, and hawthorn powder according to the formula ratio to obtain jam;

[0048] Furthermore, the auxiliary material printing nozzle food preparation color protection liquid is 10-20g / L Nacl solution, the soaking time is 3-5min, the screen is 40-60 mesh, and the weight ratio of pulp: sucrose: hawthorn powder is 1:0.60-0.55:0.05-0.10.

[0049] Beneficial effects of the present invention:

[0050] (1) Compared with the existing mold processing technology, the present invention adopts three-nozzle 3D printing technology, which not only realizes the processing of special-shaped hawthorn snack products and expands the variety of hawthorn snacks, but also reduces the sugar content, shortens the drying time, reduces the production cost, and improves the product competitiveness of hawthorn processing enterprises.

[0051] (2) Compared with the existing single-nozzle 3D printing method, the present invention adopts a dual-material dual-nozzle 3D printing method to solve the problem of needle clogging in the single-nozzle printing process of traditional hawthorn snack making ingredients.

[0052] (3) Compared with the existing dual-nozzle 3D printing method, the present invention adopts a three-nozzle 3D printing method. During the alternating 3D printing process between the substrate nozzle and the auxiliary nozzle, the hot air curing of the condensation nozzle is used to improve the structural support of the printed product online, solving the problem of easy collapse during the printing process of special-shaped hawthorns; physical field-assisted drying and rapid dehydration and curing can achieve precise printing of products with more complex structures and larger volumes.

[0053] (4) Compared with existing 3D printed fresh food products, the present invention uses physical field assisted drying to enable the printed hawthorn samples to be quickly dehydrated and dried, thereby maintaining the special structure of the 3D printed hawthorn samples, improving the accuracy of the printed products, shortening the drying time, and extending the product storage period, thereby expanding the application scope of food 3D printing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the three-dimensional structure of the device of the present invention.

[0055] Figure 2 It is a top view of the device of the present invention.

[0056] Figure 3 It is a front view of the device of the present invention.

[0057] Figure 4 It is a schematic cross-sectional view of the coagulation-promoting printing nozzle of the device of the present invention.

[0058] Figure 5 It is a schematic diagram of the control principle of the present invention.

[0059] Figure 6 This is a schematic diagram of modeling in step c of application example 1 of the present invention.

[0060] Figure 7 This is a schematic diagram of the final product of step g of Application Example 1 of the present invention.

[0061] Figure 8 This is a schematic diagram of modeling in step c of application example 2 of the present invention.

[0062] Fig. 9 This is a schematic diagram of the final product of step g of Application Example 2 of the present invention.

[0063] Fig.10 ae is a schematic diagram of a specially shaped hawthorn snack model of the present invention.

[0064] Figure numerals: 1. frame; 2. conveying cylinder; 3. printing platform; 4. printing tray; 5. printing sample; 6. X-axis driving device; 7. nozzle fixing part; 8. accelerator printing nozzle; 9. substrate printing nozzle; 10. auxiliary material printing nozzle; 11. Z-axis driving device; 12. infrared sensor; 13. Y-axis driving device; 14. reversing valve; 15. solenoid valve; 16. pressure regulating valve; 17. pressure reducing valve; 18. high-pressure gas tank; 19. drying chamber; 20. lifting mechanism; 21. infrared emitter; 22. sealing plate; 23. microwave generator; 24. circulating fan; 25. optical fiber sensor; 26. control cabinet; 27. air nozzle; 28. insulation pipe; 29 electric heating pipe; 30. thermocouple; 31. guide rail; 31-1. first guide groove; 31-2. second guide groove. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0066] Example 1 A 3D printing snack device based on dual materials and three nozzles

[0067] like Figure 1-4 As shown, it includes a printing platform system, a dual-material dual-nozzle 3D printing system, a single-nozzle auxiliary gel system, an air supply system, a conveying system, a physical field assisted drying system and a control system; the printing platform system is provided with a dual-material dual-nozzle 3D printing system and a single-nozzle auxiliary gel system; the air supply system is connected to the dual-material dual-nozzle 3D printing system and the single-nozzle auxiliary gel system through pipelines respectively; the printing platform system is also provided with a conveying system, and the conveying system is connected to the physical field assisted drying system; the dual-material dual-nozzle 3D printing system, the single-nozzle auxiliary gel system, the air supply system, the conveying system and the physical field assisted drying system are controlled by the control system.

[0068] Furthermore, the printing platform system includes a frame 1, a printing platform 3, a printing tray 4 and a nozzle fixing member 7; the frame 1 is hollow, and a printing platform 3 is provided inside, and a printing tray 4 is provided on the printing platform 3; the nozzle fixing member 7 is provided inside the frame 1;

[0069] The dual-material dual-nozzle 3D printing system comprises a base material printing nozzle 9 and an auxiliary material printing nozzle 10, a pipeline and a reversing valve 14; the front ends of the base material printing nozzle 9 and the auxiliary material printing nozzle 10 are mounted on the nozzle fixing member 7, and the rear ends of the base material printing nozzle 9 and the auxiliary material printing nozzle 10 are connected to the air supply system through pipelines; the pipelines are provided with reversing valves 14;

[0070] The single-nozzle auxiliary gel system includes a coagulation-promoting nozzle 8 and a solenoid valve 15; the coagulation-promoting nozzle 8 is located between the substrate printing nozzle 9 and the auxiliary material printing nozzle 10, and is also mounted on the nozzle fixing member 7; the tail of the coagulation-promoting nozzle 8 is also connected to the air supply system through a pipeline; the pipeline is provided with a solenoid valve 15;

[0071] The gas supply system includes a pressure regulating valve 16, a pressure reducing valve 17 and a high-pressure gas tank 18; the front end of the high-pressure gas tank 18 is provided with a pressure reducing valve 17; the substrate printing nozzle 9, the coagulation accelerating nozzle 8 and the auxiliary material printing nozzle 10 are all connected to the high-pressure gas tank 18 through pipelines; each of the connected pipelines is provided with a pressure reducing valve 17;

[0072] The physical field assisted drying system comprises a drying box 19, a lifting mechanism 20, an infrared heater 21, a sealing door 22, a microwave generator 23 and a circulating fan 24; the drying box 19 can move up and down along the lifting mechanism 20; the drying box 19 is provided with an infrared heater 21, a microwave generator 23 and a circulating fan 24; the drying box 19 is also provided with a sealing door 22 at the bottom;

[0073] The conveying system includes a conveying cylinder 2 and a guide rail 31; the guide rail 31 specifically includes a first guide groove 31-1 located on the printing platform 3 and a second guide groove 31-2 located on the sealing door 22, and the two are spliced ​​together to form a complete guide rail 31; the printing tray 4 can move back and forth on the printing platform 3 and the sealing door 22 along the guide rail 31 through the pushing and pulling of the push rod in the conveying cylinder 2.

[0074] Furthermore, the guide groove in the sealing door 22 is made of non-metallic material.

[0075] The control system mainly includes a control cabinet 26, and other systems are controlled by the control cabinet 26. Specifically, the control cabinet 26 controls the conveying cylinder 2, the X-axis drive device 6, the substrate printing nozzle 9, the auxiliary material printing nozzle 10, the Z-axis drive device 11, the infrared sensor 12, the Y-axis drive device 13, the reversing valve 14, the solenoid valve 15, the lifting mechanism 20, the infrared transmitter 21, the microwave generator 23, the circulating fan 24, the optical fiber sensor 25, the electric heating tube 29 and the thermocouple 30.

[0076] Furthermore, the printing platform system also includes a Z-axis drive device 11; the printing platform 3 is installed in the Z-axis direction, and the Z-axis drive device 11 controls the vertical movement of the printing platform 3; the printing tray 4 is driven by the conveying cylinder 2 to move along the guide rail 31 between the printing platform 3 and the physical field assisted drying system.

[0077] Furthermore, the printing tray 4 is made of microwave-resistant material and is designed with a positioning function.

[0078] The printing platform system also includes an X-axis driving device 6 and a Y-axis driving device 13; the nozzle fixing member 7 is controlled by the X-axis driving device 6 and the Y-axis driving device 13 to move within the X-axis and Y-axis planes; the substrate printing nozzle 9, the coagulation promoting nozzle 8 and the auxiliary material printing nozzle 10 are all installed on the nozzle fixing member 7 through the thread holes.

[0079] Furthermore, the internal structure of the substrate printing nozzle 9 and the auxiliary material printing nozzle 10 specifically includes a food extrusion tube, a support tube and a cylinder. The food of the two nozzles is evenly extruded by a cylinder extrusion method. The cylinder is connected to a high-pressure gas tank 18 through a reversing valve 14, a pressure regulating valve 16 and a pressure reducing valve 17.

[0080] An infrared sensor 12 is also provided below the nozzle fixing member 7 .

[0081] The coagulation-promoting nozzle 8 includes an air nozzle 27, an insulation tube 28, an electric heating tube 29 and a thermocouple 30; the air nozzle 27 is fixed to the inner thread of the insulation tube 28 through an external thread; the electric heating tube 29 is installed inside the insulation tube 28, and the thermocouple 30 is installed on the inner wall of the insulation tube 28. The electric heating tube 29 and the thermocouple 30 are both connected to the control cabinet 26 through a control line; the upper part of the insulation tube 28 is connected to the high-pressure gas tank 18 through a solenoid valve 15, a pressure regulating valve 16, and a pressure reducing valve 17.

[0082] A second guide groove 31-2 is provided in the drying chamber 19 in the physical field assisted drying system. The second guide groove 31-2 is made of non-metallic material. The drying chamber 19 moves up and down through the lifting mechanism 20 to allow the material tray 4 to enter and exit. The inlet and outlet door of the drying chamber 19 is designed at the bottom, and the microwave sealing of the drying chamber 19 is achieved through the sealing cover 22.

[0083] The physical field assisted drying system further includes an infrared emitter 21, which is located at the top of the drying chamber 19. The infrared emitter 21 and the top connecting plate of the drying chamber 19 are mesh plates with a diameter less than 2 mm. An infrared tube is installed in the infrared heater 21.

[0084] The microwave generator 23 is installed on the microwave feed port on the side of the drying chamber 19 through the excitation cavity; the circulating fan 24 is installed on the side of the drying chamber 19 and connected to the infrared heater 21;

[0085] The drying chamber 19 is also provided with an optical fiber sensor 25 .

[0086] Example 2 Application of 3D printing snack device based on dual materials and three nozzles

[0087] (1) Preparation of dual-nozzle 3D printing food: Prepare food from the base material printing nozzle 9 and load it into the extrusion tube of the base material printing nozzle 9; prepare food from the auxiliary material printing nozzle 10 and load it into the extrusion tube of the auxiliary material printing nozzle 10;

[0088] (2) Dual-material three-nozzle 3D printing: the base material extrusion tube is placed in the support tube of the base material printing nozzle 9, and the auxiliary material extrusion tube is placed in the support tube of the auxiliary material printing nozzle 10; turn on the power of the control cabinet 26, start the industrial computer, import the printing model, print the nozzle number, select the slicing software, slice, modify the slicing program, and insert the running program of the accelerator nozzle 8; set the running parameters of the base material printing nozzle 9, the auxiliary material printing nozzle 10, and the accelerator nozzle 8; start the running program, print and shape, and obtain the three-nozzle 3D printed sample 5 placed on the printing tray 4;

[0089] Furthermore, the dual-material dual-nozzle printing model is completed by alternately printing the substrate printing nozzle 9 and the auxiliary material printing nozzle 10, and the printing layer height range of the substrate printing nozzle 9 and the auxiliary material printing nozzle 10 is 0.8-5.0mm; the three-nozzle printing nozzle numbering refers to setting the substrate printing nozzle 9 as nozzle 1, the auxiliary material printing nozzle 10 as nozzle 2, and the accelerating coagulation nozzle 8 as nozzle 3; the modified slicing program, inserting the accelerating coagulation nozzle 8 running program, refers to that after nozzle 1 and nozzle 2 are alternately printed, nozzle 3 runs according to the path of nozzle 2, and nozzle 3 runs after the operation is completed, and nozzle 1 and nozzle 2 are then alternately printed, and then nozzle 3 runs according to the path of nozzle 2, and nozzle 1, nozzle 2, and nozzle 3 run in sequence until the printing is completed; the hot air is turned on when the nozzle 3 is running, and the hot air is stopped when it stops running;

[0090] Furthermore, the three-nozzle 3D printing parameters are set as follows: the temperature of the substrate printing nozzle 9 is 25-30°C, the printing speed is 10-15mm / s, and the cylinder pressure is 0.1-0.15MPa; the temperature of the auxiliary material printing nozzle 10 is 25-30°C, the printing speed is 8-10mm / s, and the cylinder pressure is 0.1-0.15MPa; the printing speed of the accelerating nozzle 8 is 0-10mm / s, the outlet temperature is 60-70°C, the wind speed is 0-2m / s, and the inlet pressure is 0.1-0.15MPa;

[0091] (3) Physical field assisted drying: the printing platform 3 is lowered to the lowest position, the conveying cylinder 2 in the conveying system is started, the printing tray 4 holding the printed sample 5 is moved into the second guide groove 31-2 in the drying chamber 19 through the guide rail 31, the optical fiber sensor 25 is inserted into the printed sample 5, the lifting mechanism 20 is started, and the drying chamber 19 moves down to contact the sealing plate 22; the circulating fan 24, the infrared heater 21 and the microwave generator 23 are turned on to cure or dry the printed sample 5;

[0092] Furthermore, the physical field assisted drying parameters are as follows: infrared heater power 500W, adjustment range 0-100%; microwave power 700W, adjustment range 10-100%; the maximum temperature of printed sample 5 is 60°C, the temperature control is 4 sections, namely 30°C, 40°C, 50°C and 60°C, and the corresponding microwave powers are 100%, 75%, 50%, 25%, and the operating time setting range is 0-60h;

[0093] (4) Continue printing / product packaging: After the physical field assisted drying is completed, the elevator 20 is started, the drying chamber 19 moves up and separates from the sealing plate 22, the conveying system is started, the material tray 4 moves to the printing platform 3, and the printing continues according to the design program, or after the printing is completed, the printed sample 5 is taken out and packaged in an aluminum foil bag.

[0094] The method for preparing the food material of the substrate printing nozzle 9 in step 1 is: sorting, washing, removing stems, removing cores, protecting color, steaming, beating and filtering fresh hawthorns to obtain hawthorn pulp; mixing the hawthorn pulp and sucrose according to the formula ratio to obtain hawthorn jam;

[0095] Further, the substrate printing nozzle 9 food preparation method said color protection liquid is 10-20g / LNaCl solution, soaking time 3-5min, cooking temperature 100°C, time 10-15min, sieve 40-60 mesh, hawthorn pulp: sucrose weight ratio is 1:0.40-0.35;

[0096] The method for preparing food materials of the auxiliary material printing nozzle 10 is as follows: sorting, washing, peeling or removing the core, protecting the color, beating, and filtering fresh fruits to obtain pulp; mixing the pulp, sucrose, and hawthorn powder according to the formula ratio to obtain jam;

[0097] Furthermore, the auxiliary material printing nozzle 10 prepares the color protection liquid of the food material as 10-20g / L NaCl solution, the soaking time is 3-5min, the screen is 40-60 mesh, and the weight ratio of pulp: sucrose: hawthorn powder is 1:0.60-0.55:0.05-0.10.

[0098] Application Example 1: Preparation of special shaped hawthorn snacks based on hawthorn-banana combination gel and three-nozzle 3D printing

[0099] a. Preparation of ingredients for substrate printing nozzle 9: Take out fresh hawthorn from the refrigerator, remove rotten hawthorn, wash, remove stems, remove cores, and protect the color (immerse in 20g / L Nacl solution for 5min), then put the cored hawthorn into the rice cooker and cook for 15min, take it out and crush it with a beater, and squeeze it through a 60-mesh screen to obtain hawthorn pulp; mix the hawthorn pulp and sucrose according to the formula ratio to obtain the ingredients for substrate printing nozzle 9; put the ingredients for substrate printing nozzle 9 into the substrate extrusion tube for standby use. The formula ratio of hawthorn pulp to sucrose is hawthorn pulp: sucrose weight ratio = 1:0.35.

[0100] b. Preparation of ingredients for auxiliary material printing nozzle 10: Peel the banana and cut it into 5mm slices, put it into a pulper to crush it into banana pulp. Take a certain amount of banana pulp and put it into a beaker, add sucrose and hawthorn powder according to the formula ratio, put it in a 70℃ water bath and stir it continuously, and take out the sucrose after it is fully dissolved to obtain the ingredients for auxiliary material printing nozzle 10. Put the ingredients for auxiliary material printing nozzle 10 into the auxiliary material extrusion tube for standby use. The formula ratio of banana pulp, sucrose and hawthorn powder is banana pulp: sucrose: hawthorn powder weight ratio = 1:0.60:0.05.

[0101] c. Model import and slicing: Select a special model from the control cabinet industrial control computer model library, import the print model file, set the substrate printing nozzle 9 as nozzle 1, the auxiliary material printing nozzle 10 as nozzle 2, and the accelerator nozzle 8 as nozzle 3, select the slicing software, and perform slicing processing, insert the accelerator nozzle 8 running program; Model size: a three-dimensional hollow cylinder with an outer diameter of 25mm, an inner diameter of 15mm, and a height of 20mm. Specific examples Figure 6 shown.

[0102] d. Insert 3D printed food: insert the base material extrusion tube containing food into the support tube of the base material printing nozzle 9, and the inner diameter of the nozzle is 1.2mm; insert the auxiliary material extrusion tube containing food into the support tube of the auxiliary material printing nozzle 10, and the inner diameter of the nozzle is 1.2mm.

[0103] e. 3D printer parameter settings and operation: Nozzle 1: temperature is 30℃, printing speed is 10mm / s, and printing layer height is 2mm; Nozzle 2: temperature is 30℃, printing speed is 8mm / s, and printing layer height is 2mm; Nozzle 3: outlet temperature is 60℃, inlet pressure is 0.2MPa, and wind speed is 0.5m / s; click the 3D print run button and the printer will run.

[0104] f. Physical field assisted drying: After printing is completed, the lifting mechanism 20 is started, the printing platform 3 moves down to the lowest position, the conveying mechanism 2 is started, the printing tray 4 moves into the drying chamber 19, the optical fiber sensor 25 is inserted, the drying chamber 19 moves down and seals with the sealing plate 22, the circulating fan 24, the infrared heater 21, and the microwave generator 23 are turned on to dry the printed sample 5; after drying, the lifting mechanism 20 is started, the drying chamber 19 moves up to separate from the sealing plate 22, the optical fiber sensor 25 is unplugged, the conveying mechanism 2 is started, the printing tray 4 in the drying chamber 19 moves to the printing platform 3, the dried printed sample 5 is taken out and packaged; drying parameter settings: infrared power 300W, microwave power 300W, 4 product temperature sections are 30℃, 40℃, 50℃, 60℃, and the total operating time is 14h.

[0105] g. Results: The outer diameter and height deviations of the hawthorn snack products prepared based on the hawthorn-banana dual-material combination gel and three-nozzle 3D printing were 1.04% and 1.08%, respectively. Compared with traditional hawthorn dried products (strips), the drying time was shortened by 80.56%, the hardness was reduced by 20.64%, the total sugar was reduced by 2.48%, the flavonoids and total phenols were increased by 23.31% and 25.94%, respectively, and the antioxidant capacity was increased by more than 28.53%.

[0106] The specific process of printing and preparing the product in this application example is as follows: Figure 7 shown.

[0107] Application Example 2: Preparation of special shaped hawthorn snacks based on hawthorn-persimmon combination gel and three-nozzle 3D printing

[0108] a. Preparation of ingredients for substrate printing nozzle 9: take out fresh hawthorn from the refrigerator, remove rotten hawthorn, wash, remove stems, remove cores, and protect the color (immerse in 20g / L Nacl solution for 5min), then put the cored hawthorn into an electric rice cooker and steam for 15min, take out and crush it with a beater, and extrude it through a 60-mesh sieve to obtain hawthorn pulp; mix the hawthorn pulp and sucrose according to the formula ratio to obtain ingredients for substrate printing nozzle 9; load the ingredients for substrate printing nozzle 9 into the substrate extrusion tube for use; the formula ratio of hawthorn jam and sucrose is hawthorn jam: sucrose = 1:0.30.

[0109] b. Preparation of ingredients for auxiliary material printing nozzle 10: Take out fresh persimmons from the refrigerator, peel them and put them into a pulper to crush them into persimmon pulp. Take a certain amount of persimmon pulp and put it into a beaker, add sucrose and hawthorn powder in proportion, put it in a 70℃ water bath and stir it continuously, wait for the sucrose to fully dissolve and take it out to obtain the ingredients for auxiliary material printing nozzle 10; put the ingredients for auxiliary material printing nozzle 10 into the auxiliary material extrusion tube and set aside; the formula ratio of persimmon pulp, sucrose and hawthorn powder is persimmon pulp: sucrose: hawthorn powder = 1:0.55:0.10.

[0110] c. Model import and slicing: Select a special model from the model library of the industrial computer in the control cabinet 26, and import the print model file; set the substrate print nozzle 9 as nozzle 1, the auxiliary material print nozzle 10 as nozzle 2, and the accelerator nozzle 8 as nozzle 3; select the slicing software and perform slicing processing, insert the accelerator nozzle 8 to run the program, select the slicing software, and perform slicing processing; model size: a cartoon cat with a bottom outer diameter of 34mm and a height of 20mm. And modify the model size through Rhinoceros 7, and change the height of each layer of model printing to 0.8mm, 1.2mm, and 1.6mm respectively.

[0111] When printing, the slice shape in the modeling program is as follows Figure 8 shown.

[0112] d. Insert 3D printed food: insert the base material extrusion tube containing food into the support tube of the base material printing nozzle 9, and the inner diameter of the nozzle is 1.2mm; insert the auxiliary material extrusion tube containing food into the support tube of the auxiliary material printing nozzle 10, and the inner diameter of the nozzle is 1.2mm.

[0113] e. 3D printer parameter settings and operation: Nozzle 1: temperature is 35°C, printing speed is 10mm / s; Nozzle 2: temperature is 35°C, printing speed is 10mm / s; Nozzle 3: outlet temperature is 70°C, inlet pressure is 0.2MPa, wind speed is 0.8m / s; turn on the 3D printer and run it;

[0114] f. Physical field assisted drying: After printing is completed, the lifting mechanism 20 is started, the printing platform 3 moves down to the lowest position, the conveying mechanism 2 is started, the printing tray 4 moves into the drying chamber 19, the optical fiber sensor 25 is inserted, the drying chamber 19 moves down and seals with the sealing plate 22, the circulating fan 24, the infrared heater 21, and the microwave generator 23 are turned on to dry the printed sample 5; after drying, the lifting mechanism 20 is started, the drying chamber 19 moves up to separate from the sealing plate 22, the optical fiber sensor 25 is unplugged, the conveying mechanism 2 is started, the printing tray 4 in the drying chamber 19 moves to the printing platform 3, the dried printed sample 5 is taken out and packaged; drying parameter settings: infrared power 350W, microwave power 300W, 4 product temperature sections are 30℃, 40℃, 50℃, 60℃, and the total operating time is 12h.

[0115] g. Results: The printing accuracy of hawthorn snack products prepared based on hawthorn-persimmon dual-material combination gel and three-nozzle 3D printing was 1.83% and 1.90% in outer diameter and height deviation respectively. Compared with traditional dried hawthorn strips, the drying time was shortened by 83.33%, the hardness was reduced by 25.34%, the total sugar was reduced by 3.58%, the flavonoids and total phenols were increased by 26.35% and 29.44% respectively, and the antioxidant capacity was increased by more than 32.23%.

[0116] In this application example, the printed sample is as follows Fig. 9 A schematic diagram of some hawthorn snacks that can be 3D printed using the device and application of the present invention is shown in FIG. Fig.10 As shown in ae.

Claims

1. A 3D printing snack device based on dual materials and three nozzles, characterized by: It includes a printing platform system, a dual-material dual-nozzle 3D printing system, a single-nozzle auxiliary gel system, an air supply system, a conveying system, a physical field assisted drying system and a control system; The printing platform system is provided with a dual-material dual-nozzle 3D printing system and a single-nozzle auxiliary gel system; the air supply system is connected to the dual-material dual-nozzle 3D printing system and the single-nozzle auxiliary gel system through pipelines respectively; the printing platform system is also provided with a conveying system, which is connected to the physical field assisted drying system; the dual-material dual-nozzle 3D printing system, the single-nozzle auxiliary gel system, the air supply system, the conveying system and the physical field assisted drying system are controlled by the control system.

2. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 1 is characterized by: The printing platform system comprises a frame (1), a printing platform (3), a printing tray (4) and a nozzle fixing member (7); the frame (1) is hollow, and a printing platform (3) is provided inside, and a printing tray (4) is provided on the printing platform (3); the frame (1) is also provided with a nozzle fixing member (7); The dual-material dual-nozzle 3D printing system comprises a base material printing nozzle (9) and an auxiliary material printing nozzle (10), a pipeline and a reversing valve (14); the front ends of the base material printing nozzle (9) and the auxiliary material printing nozzle (10) are mounted on a nozzle fixing member (7), and the rear ends of the base material printing nozzle (9) and the auxiliary material printing nozzle (10) are connected to an air supply system through a pipeline; and the pipeline is provided with a reversing valve (14); The single-nozzle auxiliary gel system comprises a coagulation-promoting nozzle (8) and a solenoid valve (15); the coagulation-promoting nozzle (8) is located between the substrate printing nozzle (9) and the auxiliary material printing nozzle (10), and is also mounted on the nozzle fixing member (7); the tail of the coagulation-promoting nozzle (8) is also connected to the air supply system through a pipeline; the pipeline is provided with a solenoid valve (15); The gas supply system comprises a pressure regulating valve (16), a pressure reducing valve (17) and a high-pressure gas tank (18); a pressure reducing valve (17) is provided at the front end of the high-pressure gas tank (18); the substrate printing nozzle (9), the coagulation accelerating nozzle (8) and the auxiliary material printing nozzle (10) are all connected to the high-pressure gas tank (18) through pipelines; a pressure reducing valve (17) is provided on each of the connected pipelines; The physical field assisted drying system comprises a drying box (19), a lifting mechanism (20), an infrared heater (21), a sealing door (22), a microwave generator (23) and a circulating fan (24); the drying box (19) can move up and down along the lifting mechanism (20); the drying box (19) is provided with an infrared heater (21), a microwave generator (23) and a circulating fan (24); and the bottom of the drying box (19) is also provided with a sealing door (22); The conveying system comprises a conveying cylinder (2) and a guide rail (31); the guide rail (31) specifically comprises a guide groove (31-1) located on the printing platform (3) and a guide groove (31-2) located on the sealing door (22), the two being spliced ​​together to form a complete guide rail (31); the printing tray (4) can move back and forth on the printing platform (3) and the sealing door (22) along the guide rail (31) by pushing and pulling a push rod in the conveying cylinder (2). The control system mainly comprises a control cabinet (26), and other systems are controlled through the control cabinet (26).

3. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 2 is characterized by: The printing platform system further comprises a Z-axis driving device (11); the printing platform (3) is installed in the Z-axis direction, and the Z-axis driving device (11) controls the vertical movement of the printing platform (3); the printing tray (4) is driven by the conveying cylinder (2) to move along the guide rail (31) between the printing platform (3) and the physical field assisted drying system.

4. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 2, characterized in that: The printing platform system further comprises an X-axis driving device (6) and a Y-axis driving device (13); the nozzle fixing member (7) is controlled by the X-axis driving device (6) and the Y-axis driving device (13) to move within the X-axis and Y-axis planes; the substrate printing nozzle (9), the coagulation accelerating nozzle (8) and the auxiliary material printing nozzle (10) are all mounted on the nozzle fixing member (7) through thread holes; An infrared sensor (12) is also provided below the nozzle fixing member (7).

5. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 2, characterized in that: The coagulation-promoting nozzle (8) comprises an air nozzle (27), a heat preservation tube (28), an electric heating tube (29) and a thermocouple (30); the air nozzle (27) is fixed to the inner thread of the heat preservation tube (28) through an external thread; the electric heating tube (29) is installed inside the heat preservation tube (28), the thermocouple (30) is installed on the inner wall of the heat preservation tube (28), and the electric heating tube (29) and the thermocouple (30) are both connected to the control cabinet (26) through a control line; The upper portion of the heat preservation pipe (28) is connected to the high-pressure gas tank (18) via a solenoid valve (15), a pressure regulating valve (16) and a pressure reducing valve (17).

6. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 2, characterized in that: A second guide groove (31-2) is provided in the drying chamber (19) in the physical field assisted drying system. The second guide groove (31-2) is made of a non-metallic material. The drying chamber (19) moves up and down through a lifting mechanism (20) to allow the material tray (4) to enter and exit. The inlet and outlet door of the drying chamber (19) is designed at the bottom, and microwave sealing of the drying chamber (19) is achieved through a sealing cover (22); The physical field assisted drying system further comprises an infrared emitter (21), which is located at the top of the drying chamber (19); the infrared emitter (21) and the top connecting plate of the drying chamber (19) are orifice plates with a diameter less than 2 mm; and an infrared tube is installed in the infrared heater (21); The microwave generator (23) is installed on the microwave feed port on the side of the drying chamber (19) through the excitation cavity; the circulating fan (24) is installed on the side of the drying chamber (19) and is connected to the infrared heater (21); An optical fiber sensor (25) is also installed on the drying chamber (19).

7. The 3D printing snack device based on dual materials and three nozzles as claimed in claim 2, characterized in that: The conveying cylinder (2) in the conveying system is located below the printing platform (3) and parallel to the lowest position of the printing tray (4). The conveying cylinder (2) conveys the printed sample (5) in the printing tray (4) to the drying chamber (19) through a second guide groove (31-2) in the drying chamber (19).

8. Use of the device according to any one of claims 1 to 7, characterized in that: Use it to print hawthorn snacks with special shapes.

9. Use of the device according to any one of claims 1 to 7, characterized in that The steps are: (1) Preparation of dual-nozzle 3D printing food materials: preparing food materials for the base material printing nozzle (9) and loading them into the extrusion tube of the base material printing nozzle (9); preparing food materials for the auxiliary material printing nozzle (10) and loading them into the extrusion tube of the auxiliary material printing nozzle (10); (2) Dual-material three-nozzle 3D printing: the base material extrusion tube is placed in the support tube of the base material printing nozzle (9), and the auxiliary material extrusion tube is placed in the support tube of the auxiliary material printing nozzle (10); turn on the power of the control cabinet (26), start the industrial computer, import the printing model, print the nozzle number, select the slicing software, slice, modify the slicing program, and insert the running program of the accelerator nozzle (8); set the running parameters of the base material printing nozzle (9), the auxiliary material printing nozzle (10), and the accelerator nozzle (8); start the running program, print and shape, and obtain the three-nozzle 3D printed sample (5) placed on the printing tray (4); Furthermore, the dual-material dual-nozzle printing model is completed by alternately printing the substrate printing nozzle (9) and the auxiliary material printing nozzle (10), and the printing layer height range of the substrate printing nozzle (9) and the auxiliary material printing nozzle (10) is 0.8-5.0 mm; the three-nozzle printing nozzle numbering refers to setting the substrate printing nozzle (9) as nozzle 1, the auxiliary material printing nozzle (10) as nozzle 2, and the accelerating nozzle (8) as nozzle 3; the modified slicing program, inserting the accelerating nozzle (8) running program, refers to that after nozzle 1 and nozzle 2 are alternately printed, nozzle 3 runs according to the path of nozzle 2, and nozzle 3 runs after the operation is completed, and nozzle 1 and nozzle 2 are then alternately printed, and then nozzle 3 runs according to the path of nozzle 2, and nozzle 1, nozzle 2, and nozzle 3 run in sequence until the printing is completed; when nozzle 3 is running, the hot air is turned on, and when it stops running, the hot air is stopped; Furthermore, the three-nozzle 3D printing parameters are set as follows: the temperature of the substrate printing nozzle (9) is 25-30° C., the printing speed is 10-15 mm / s, and the cylinder pressure is 0.1-0.15 MPa; the temperature of the auxiliary material printing nozzle (10) is 25-30° C., the printing speed is 8-10 mm / s, and the cylinder pressure is 0.1-0.15 MPa; the accelerator nozzle (8) has a printing speed of 0-10 mm / s, an outlet temperature of 60-70° C., a wind speed of 0-2 m / s, and an inlet pressure of 0.1-0.15 MPa; (3) Physical field assisted drying: the printing platform (3) is lowered to the lowest position, the conveying cylinder (2) in the conveying system is started, the printing tray (4) holding the printed sample (5) is moved into the second guide groove (31-2) of the drying chamber (19) through the guide rail (31), the optical fiber sensor (25) is inserted into the printed sample (5), the lifting mechanism (20) is started, and the drying chamber (19) moves down to contact the sealing plate (22); the circulating fan (24), the infrared heater (21) and the microwave generator (23) are turned on to solidify or dry the printed sample (5); Furthermore, the physical field assisted drying parameters are as follows: infrared heater power 500W, adjustment range 0-100%; microwave power 700W, adjustment range 10-100%; the maximum temperature of the printed sample (5) is 60°C, the temperature control is 4 sections, namely 30°C, 40°C, 50°C and 60°C, and the corresponding microwave powers are 100%, 75%, 50%, 25%°C, respectively, and the operating time setting range is 0-60h; (4) Continue printing / product packaging: After the physical field assisted drying is completed, the elevator (20) is started, the drying chamber (19) moves upward and separates from the sealing plate (22), the conveying system is started, the material tray (4) moves to the printing platform (3), and the printing continues according to the design program, or after the printing is completed, the printed sample (5) is taken out and packaged in an aluminum foil bag.

10. Use of the device according to any one of claims 1 to 7, characterized in that: The method for preparing the food material of the substrate printing nozzle (9) in step (1) is as follows: sorting, washing, removing stems, removing cores, protecting color, steaming, pulping and filtering fresh hawthorns to obtain hawthorn pulp; mixing the hawthorn pulp and sucrose according to a formula ratio to obtain hawthorn jam; Furthermore, the substrate printing nozzle (9) food preparation method, the color protection liquid is 10-20g / L NaCl solution, the soaking time is 3-5min, the cooking temperature is 100°C, the time is 10-15min, the screen is 40-60 mesh, and the weight ratio of hawthorn pulp: sucrose is 1:0.40-0.35; The auxiliary material printing nozzle (10) has the following ingredients preparation method: fresh fruits are sorted, washed, peeled or pitted, color protected, pulped, and filtered to obtain pulp; pulp, sucrose, and hawthorn powder are mixed and stirred according to a formula ratio to obtain jam; Furthermore, the auxiliary material printing nozzle (10) is used to prepare the color protection liquid of the food material, which is a 10-20 g / L NaCl solution, the soaking time is 3-5 min, the screen is 40-60 mesh, and the weight ratio of the fruit pulp: sucrose: hawthorn powder is 1: 0.60-0.55: 0.05-0.10.

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