Handheld 3D printer, printing material and printing method

Abstract

The embodiment of the invention discloses a handheld 3D printer, a printing material and a printing method, belongs to the technical field of food processing, and can realize a side extrusion type handheld 3D printer for food and a filled printing material without heating. The printer comprises a disposable ink bag which is arranged to be of a short cavity structure with a nozzle and is used for carrying printing materials; the spray gun structure comprises a long cavity structure and a nozzle limiting stopper fixed to the discharging end of the long cavity structure, the cavity part of the short cavity structure is arranged in the long cavity structure, and a nozzle is fixed through the nozzle limiting stopper and extends out of the long cavity structure; the side extrusion assembly is connected with the inner wall of the long cavity structure and makes contact with the side surface of the disposable ink bag in the axial direction of the long cavity structure. And the control driving assembly is arranged on the spray gun structure and is connected with the side extrusion assembly.

Description

Technical Field

[0001] This document relates to the field of food processing technology, and in particular to a handheld 3D printer, printing materials and printing methods. Background Art

[0002] In daily life, we often see bakers, chefs and other food processors put high-viscosity materials in a plastic bag with a small hole in one corner. Bakers, chefs and other food processors manually squeeze the materials out of the plastic bag with a small hole, thus making delicate and appetizing food on the plate. However, in the production process, the uniformity of the discharge amount and the consistency of the discharge direction require years of experience accumulation. It is not easy to accurately control and requires high professional skills, which is even more difficult for ordinary people to achieve.

[0003] 3D (Three Dimension, abbreviated as 3D) printing technology is usually a technology that uses digital model files as the basis to build 3D objects by printing adhesive materials layer by layer. It belongs to additive manufacturing technology and can be used for the manufacture of customized industrial products, customized medical devices, customized daily necessities and other products in many fields. With the continuous expansion of people's needs and the development of this technology, 3D printing technology is being used in the food industry for food manufacturing. The printing raw materials can be a mixture of various foods, colorants and nutrients. The printed food can be colorful and in various shapes, which can increase the attractiveness of food, help improve appetite, and help enrich the diet.

[0004] However, applying 3D printing technology to print food requires the support of expensive and complex printing equipment, and still requires certain programming technical capabilities. At the same time, in order to ensure smooth discharge and molding, the printing material needs to have additives to match the hot melt printing equipment. Usually, special printing materials are processed by the factory. Therefore, it will cost a huge amount of money and be very difficult for ordinary people to use this technology to print food. Summary of the invention

[0005] The purpose of the embodiments of this specification is to provide a handheld 3D printer, printing materials and printing method, so as to avoid the defects of difficulty in use for ordinary people due to the complexity of 3D printing equipment and the need to match special printing materials for food printing, thereby realizing a side-extrusion handheld 3D printer that can be used for food. There is no need to heat the loaded printing materials, and the printing materials can be prepared by ordinary food, so that ordinary people (including children) can hold the 3D printer to print food.

[0006] In order to achieve the above purpose, the embodiments of this specification adopt the following scheme:

[0007] In a first aspect, a handheld 3D printer is provided, comprising:

[0008] A disposable ink bag, configured as a short cavity structure with a nozzle, for carrying printing materials;

[0009] The spray gun structure comprises a long cavity structure and a nozzle stopper fixed to the discharge end of the long cavity structure, the cavity part of the short cavity structure is arranged in the long cavity structure, and the nozzle is fixed by the nozzle stopper and extends out of the long cavity structure;

[0010] A side extrusion assembly connected to the inner wall of the long cavity structure and also in contact with the side surface of the disposable ink bag along the axial direction of the long cavity structure;

[0011] A control drive assembly is arranged on the spray gun structure and connected to the side extrusion assembly, and is used to drive the side extrusion assembly to apply pressure to the side surface of the disposable ink bag, so that the disposable ink bag deforms and discharges the material, so as to spray the printing material through the nozzle.

[0012] In a second aspect, a printing material for a handheld 3D printer is provided. The handheld 3D printer is the aforementioned handheld 3D printer, and the printing material is carried by a disposable ink bag in the handheld 3D printer; the printing material is prepared from food, or prepared from food and food additives.

[0013] In a third aspect, a printing method of a handheld 3D printer is provided, wherein the handheld 3D printer is the aforementioned handheld 3D printer, and the printing method comprises:

[0014] In response to user operation, the control drive component in the handheld 3D printer drives the side extrusion component to move to extrude the disposable ink bag in the handheld 3D printer, and sprays the printing material from the spray gun structure in the handheld 3D printer to the carrying platform to form a printed construction material; wherein, before the user operation, the disposable ink bag carries the printing material of the aforementioned handheld 3D printer; the carrying platform is used to carry a stacked combination of printed construction materials, and the stacked combination is cured to form a 3D printed food.

[0015] In the scheme of the embodiment of this specification, the handheld 3D printer can be applied to 3D food printing, that is, the printed material can be food. By setting the side extrusion component and the disposable ink sac in the narrow space in the long cavity structure of the spray gun structure, the side extrusion component in the spray gun structure, under the driving action of the control drive component, performs side extrusion on the disposable ink sac carrying the printing material in the spray gun structure to achieve uniform extrusion of the material, rather than extruding from the top of the disposable ink sac. There is an air layer defect in the top extrusion, and there is no worry about the air layer effect in the side extrusion. The scheme of the embodiment of this specification does not require cleaning and reloading of materials, and has good and consistent discharge directionality and uniformity of discharge amount.

[0016] Other features and advantages of the embodiments of this specification will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present specification and constitute a part of the present specification. The present disclosure is described in the attached drawings in an exemplary rather than limiting manner, and in particular should not constitute the sole and inappropriate limitation of the present specification. In the drawings:

[0018] Figure 1 A cross-sectional schematic diagram of an exemplary handheld 3D printer according to an embodiment of this specification;

[0019] Figure 2 This is a schematic diagram of an exemplary handheld 3D printer according to an embodiment of this specification;

[0020] Figure 3 A cross-sectional schematic diagram of an exemplary handheld 3D printer according to an embodiment of this specification;

[0021] Figure 4 This is a schematic diagram of the main steps of a printing method of an exemplary handheld 3D printer according to an embodiment of this specification. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this specification clearer, the technical solutions of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. It can be understood that the described embodiments are only part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by any modification, equivalent replacement, improvement, etc. made by ordinary technicians in this field without departing from the present disclosure shall fall within the scope of protection of this document.

[0023] As mentioned above, ordinary 3D printers mainly print customized products. When applied to food printing, some food 3D printers are designed with reference to general 3D printers. Most of them are desktop devices, and still have structural components such as printer frame, constant temperature control system, feeding mechanism, discharging mechanism, etc., and need to be connected to large devices such as air compressor, material tank, heating device and constant pressure buffer tank for material supply. It is suitable for some food processing plants to produce customizable food, but its equipment parts are too many and large, and it takes up a lot of living space. The printing technology requirements are high, and the realization cost and use cost are too high. This type of printing equipment is difficult to overcome the defects of insufficient integration and high cost, making it basically unusable for the general public.

[0024] In some experimental examples where the printer frame is removed, an attempt can be made to use the pen structure as the body of the 3D printer. The solution of the food 3D printing pen includes a housing assembly, a motor, an extrusion assembly, a barrel and a discharge nozzle. The motor, the extrusion assembly and the barrel are arranged from top to bottom inside the housing assembly. The extrusion push rod and the extrusion piston of the extrusion assembly extend into the barrel. The motor is connected to the other end of the extrusion push rod through the extrusion screw, and pushes the extrusion push rod and the extrusion piston to move in the barrel. The extrusion speed and the heating temperature of the barrel can be adjusted by controlling the main board. A heating film is provided on the outside of the barrel. The heating film is connected to the control main board through a wire, and the printing material inside the barrel can be heated by the heating film. The motor drives the extrusion assembly to extrude the printing material in the barrel from the outlet end of the discharge nozzle. Among them, for loading the barrel, first move the extrusion piston to the bottom of the barrel, unscrew the discharge nozzle, load the chocolate raw material into the barrel, and then screw on the discharge nozzle to complete the loading; after putting the raw material into the barrel, heat it by starting the program through the control mainboard to turn the solid raw material into a fluid liquid raw material; control the mainboard to start the motor to rotate the extrusion screw, thereby driving the extrusion push rod to move up and down; at the same time, drive the extrusion piston at the lower end of the extrusion push rod to extrude the heated liquid raw material from the outlet end of the discharge nozzle.

[0025] However, first, the extrusion piston is extended into the barrel, and the extrusion piston is in direct contact with the printing material in the barrel, so that the heated printing material is pushed out of the barrel. The pressure-applying structure and the printing material are not isolated from each other. After use, the extrusion piston and the barrel need to be reset and reloaded with materials. There will be a large amount of high-viscosity food residue between the extrusion piston and the barrel (it is difficult to print and form using lower viscosity food), and the discharge nozzle is easily blocked by solidified food. The printing pen of this scheme will be difficult to continue using without cleaning. According to the structure of the extrusion piston and the barrel, there are many narrow gaps, and even cleaning operations are very difficult, and solvents, detergents and lubricants need to be introduced, which makes it inconvenient to use and complicated to maintain, which is not conducive to food safety assurance.

[0026] Second, since the barrel needs to support the piston movement, only rigid materials can be selected. Chocolate (or other candies, etc.) raw materials are solid raw materials. After the chocolate raw materials are placed in the barrel, a large number of gaps will be formed. As the heating film outside the barrel heats the chocolate raw materials, the solid raw materials become fluid liquid raw materials. However, due to the large number of gaps before heating and the influence of gravity, there will be a certain amount of air between the piston and the chocolate liquid plane in the barrel. When the extrusion push rod is driven up and down, the compressibility of these air makes it play an elastic propulsion role between the piston plane and the chocolate liquid plane, causing the piston to fluctuate the extrusion force on the chocolate liquid plane. In order to achieve the pattern and three-dimensional configuration required by the user, printing food is often not completed in one spray. The motor needs to be frequently started and stopped from the beginning to the end of printing. After each start and stop, the elastic propulsion effect will cause the extrusion force to fluctuate, thereby affecting the uniformity of the discharge. Therefore, pushing and extruding the chocolate liquid along the axis of the printing pen up and down cannot make the discharge direction consistent and the discharge amount uniform.

[0027] Third, in order to start printing in time, the temperature of the heating film cannot be set too low, so that the chocolate can melt quickly. Too high a temperature will easily make the printing pen shell hot, which will lead to a poor user experience. Adding a heat insulation layer will further increase the implementation cost and make the printing pen larger. At the same time, it often takes a long time to make printed food (printed works), and the heating film will need to maintain the temperature so that the chocolate liquid will no longer solidify, resulting in a large power consumption of the printing pen.

[0028] Therefore, it is difficult for this attempted solution to overcome the defects of inconsistent discharge direction and uneven discharge amount of the heated piston-propelled printing pen at a low implementation cost and use cost, and it is still difficult for ordinary people to use this printing pen to print food.

[0029] In view of this, the scheme of this specification provides a scheme for a handheld 3D printer, printing materials and a printing method. The side surface of the disposable ink sac is squeezed by the side extrusion component so that the extrusion force acts evenly on the printing material through the side surface of the disposable ink sac. A small amount of gas can be stored at the upper end of the disposable ink sac, which does not affect the uniformity of the side extrusion force generated by the side extrusion component of the control drive component on the side surface of the disposable ink sac. The uniformity of the side extrusion force can be maintained even after multiple starts and stops during printing. A disposable ink sac is used to isolate the material from the machine body. The ink sac and its nozzle can be integrated, support one-time use without reinstallation, do not need to be cleaned, and the material filled in the ink sac does not need to be heated and supports cold material printing. The long and short cavity structures are arranged in the spray gun structure, which is portable and supports hand-held. Thereby, a handheld 3D printer with consistent discharge direction and uniform discharge amount can be realized. It is simple and convenient for ordinary people to use. The extrusion control of the printing material is like the extrusion control of professionals. It has a good experience, low cost, simple maintenance and high economic value.

[0030] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0031] One embodiment of this specification provides a handheld 3D printer, please refer to Figure 1 , which may include:

[0032] The disposable ink bag 8 is configured as a short cavity structure with a nozzle 1 and is used for carrying printing materials.

[0033] In the embodiments of the present specification, the disposable ink bag may be a single-hole bag cavity, which may be used as a carrier for disposable printing materials, so that the printing materials are isolated from the printer structure, without causing contamination of the printer structure and without the need for cleaning and reloading of materials.

[0034] In some possible implementations, the cavity portion of the short cavity structure may be a short columnar shape, and the nozzle may be the only opening on the short cavity structure. The side surface may be a flat curved surface to facilitate further uniformity of the lateral extrusion force. The inner surface of the short cavity structure may be a smooth surface to facilitate extrusion of the printed material.

[0035] In some possible examples, the disposable ink sac can be an integrally formed structure, that is, the nozzle and the short cavity structure are integrated, the diameter of the cavity part of the short cavity structure mainly used to carry the printing material can be the maximum diameter of the nozzle, the minimum diameter of the nozzle can be the caliber of the nozzle, and the nozzle can be funnel-shaped, so that the disposable ink sac has a simple structure, does not require maintenance, and the printing material extrusion process is smoother, and there is no gap or structural obstruction between the structures. In addition, the disposable ink sac can also be a sleeve structure, and the nozzle can be sealed with the short cavity structure. For example, the opening of the short cavity structure can be sleeved on the feed port of the nozzle, and the two can be fixed with a seal and a fastener. In some preferred examples of handheld 3D printers, the caliber of the nozzle of the disposable ink sac is preferably 0.8mm, 1.0mm or 1.2mm, etc.; the material of the disposable ink sac can be selected from food grade (food contact grade or better) hose material, such as food grade silicone or rubber, etc. Among them, if the nozzle is a separate component, food grade hard plastic or stainless steel can be selected, which is more conducive to the consistency of the discharge direction and the uniformity of the discharge amount. It can be understood that the specific structural design and size of the disposable ink bag can be selected and designed according to actual needs, manufacturing molds and product application environment. For example, the short cavity structure can also be a hollow ellipsoid, and the nozzle can be a hollow cone, without being limited to the above-mentioned design and selection. For example, the nozzle can be threadedly connected to the nozzle limiter.

[0036] In the embodiment of this specification, the disposable ink bag can be arranged in the spray gun structure, thereby forming an integrated structure, which is convenient for handheld use. Figure 1 , Figure 2and Figure 3 , and may also include:

[0037] The spray gun structure H includes a long cavity structure B and a nozzle limiter 11 fixed to the discharge end of the long cavity structure B. The cavity part of the short cavity structure is arranged in the long cavity structure, and the nozzle 1 is fixed by the nozzle limiter 11 and extends out of the long cavity structure B.

[0038] In the embodiment of this specification, the spray gun structure can be the body of a handheld 3D printer, which can be in the shape of a long column.

[0039] In some possible implementations, the axial length (longest axis) of the spray gun structure is greater than the axial length (longest axis) of the aforementioned disposable ink sac, that is, the axial length of the long cavity structure is greater than the axial length of the short cavity structure, so that the cavity portion of the short cavity structure storing the material is built into the spray gun structure in the axial direction of the long cavity structure, which can improve the integration of the machine body without the need to connect external material supply mechanisms such as material pipes, pumps and liquid storage tanks. The spray gun structure is only provided with a nozzle stopper, but no nozzle is provided. The nozzle (which can also be disposable) is a structure on the disposable ink sac. The nozzle stopper fixes the nozzle to maintain the consistency of the spray direction, thereby ensuring the consistency of the discharge direction of the disposable ink sac, so that the handheld 3D printer will not be blocked due to the solidification of high-viscosity materials and need to be cleaned when it is used next time, avoiding inconvenience in use. The disposable ink sac is simple to manufacture, made of ordinary materials, and has low maintenance costs.

[0040] For some possible examples, please combine Figure 1 and Figure 2 , in the axial direction (attached Figure 1 , 2 In the vertical (longitudinal) direction, at a specified distance from the lower end of the nozzle limiter 11 of the spray gun structure H, a hand-holding area P can be provided on the long cavity structure. The cross-section of the hand-holding area P along the axial direction is a hyperbolic segment, which can facilitate the user to hold it with one hand for food printing.

[0041] Please refer to Figure 1 or Figure 3 The aforementioned nozzle stopper 11 may be provided with a tapered (through) hole ( / concave mold). The tapered hole may match the configuration and size of the nozzle of the disposable ink bag, for example, the tapered hole is an inverted tapered concave mold, the nozzle 1 is an inverted cone, the inner surface of the tapered hole contacts the outer surface of the nozzle 1, and the cone height of the nozzle 1 may be greater than the cone height of the tapered hole, so that the nozzle 1 is inserted into the tapered hole, extends out of the long cavity structure B, and is fixed, so as to avoid shaking of the nozzle during the extrusion process, and make the discharge direction of the nozzle 1 consistent.

[0042] The long cavity structure can be integrally formed with the nozzle stopper, or the nozzle stopper can be installed and fixed on the long cavity structure, such as by bonding or bolting, and a variety of nozzle stoppers corresponding to the nozzle diameter can be provided, so that the user can choose to install the nozzle stopper corresponding to the nozzle diameter according to their needs.

[0043] It should be noted that the hand-held area of ​​the long cavity structure may not be set as a hyperbolic concave area, and the outer surface area of ​​the long cavity structure may be set as an uneven area or a rubber sleeve may be added as the hand-held area, which is conducive to increasing the friction when holding, making it easier for users to print materials. The nozzle limiter may also be set as a hollow with other simple geometric configurations as needed, and can be selected according to the nozzle caliber and test and use effects.

[0044] In the embodiment of the present specification, in addition to the cavity part (short cavity structure) of the disposable ink bag, the aforementioned spray gun structure may also be provided with a side extrusion component for applying a side extrusion force to the side surface of the disposable ink bag. The handheld 3D printer may also include:

[0045] The side extrusion assembly is connected to the inner wall of the long cavity structure and is also in contact with the side surface of the disposable ink bag along the axial direction of the long cavity structure.

[0046] The aforementioned side extrusion component may be a movable mechanical component that applies extrusion force to the side surface of the disposable ink bag, rather than applying extrusion force to the upper end of the disposable ink bag along the axial direction of the long cavity structure. Wherein, relative to the axial direction of the long cavity structure, the side surface of the disposable ink bag may be an extended surface along the axial direction of the long cavity structure; if the cavity part (short cavity structure) of the disposable ink bag is a hollow cylinder, the side surface of the disposable ink bag may be a cylinder, rather than the bottom surface or the top surface of the cylinder; if the cavity part (short cavity structure) of the disposable ink bag is a hollow ellipsoid (the long axis may be arranged along the axial direction of the long cavity structure), the side surface of the disposable ink bag may be a tangent plane along the axial direction of the long cavity structure.

[0047] It should be noted that, in the embodiments of this specification, the axial direction refers to the direction of the axis passing through the center of the cavity outlet or the direction parallel to the axis; the arrangement of the component is along the axial direction of a structure, which may mean that the arrangement direction of the component is parallel to the axial direction, or basically parallel to the axial direction; the arrangement of the component in the embodiments of this specification is perpendicular to the axial direction of a structure or arranged radially, which may mean that the arrangement direction of the component is perpendicular to the axial direction, or basically perpendicular to the axial direction; basically, it is to provide acceptable deviations or tolerances, such as but not limited to, acceptable deviations or tolerances caused by manufacturing process fluctuations; this can be understood in the embodiments of the present invention.

[0048] For some possible implementations, see Figure 1 or Figure 3 The side extrusion assembly includes a four-connection structure 4 and a telescopic spring 2. The four-connection structure 4 includes a left clamping plate, a right clamping plate, an upper connecting rod and a lower connecting rod; the upper and lower ends of the left clamping plate are respectively movably connected (specifically, they can be rotatably connected) with the corresponding ends of the right clamping plate through an upper connecting rod and a lower connecting rod to form a quadrilateral.

[0049] In some preferred examples, the quadrilateral formed may be a rectangle or a parallelogram, and after the control driving assembly is driven, the distance between the splints gradually decreases, presenting a parallelogram with a gradually decreasing height, thereby applying a lateral extrusion force to the disposable ink sac between the splints. The lengths of the left splint and the right splint (along the axial direction of the long cavity structure) may be equal, the lengths of the upper connecting rod and the lower connecting rod may be equal, and the length of any one of the splints may be greater than the length of any one of the connecting rods, so that the contact area of ​​the splint on the side surface of the disposable ink sac is larger and the extrusion force is more uniform. It is understandable that the specific dimensions of the splints and connecting rods can be designed and selected in conjunction with the dimension selection of the long cavity structure and the short cavity structure, and can be designed and selected with reference to the actual manufactured test samples and test results.

[0050] For some possible implementations, see Figure 3 , the left clamping plate 3 and the right clamping plate 14 are both in contact with the side surface of the disposable ink bag 8.

[0051] For some preferred examples, see Figure 3 , the plane where the contact area between the aforementioned left clamp plate 3 and right clamp plate 14 and the side surface of the disposable ink bag 8 is located can be symmetrical with respect to the axial direction of the short cavity structure. Projected in a direction perpendicular to the axial direction of the long cavity structure B, the aforementioned left clamp plate 3 and right clamp plate 14 have overlapping projection areas (also referred to as clamp plate alignment areas) before and after extrusion or during extrusion. In a cross-sectional plane perpendicular to the axial direction of the long cavity structure B (a cross section is taken in the overlapping projection area), relative to the cross-sectional center of the disposable ink bag 8, the aforementioned left clamp plate 3 and right clamp plate 14 can be arranged symmetrically. This provides a structural position relationship basis for the side surface of the disposable ink bag 8 between the clamp plates to obtain a uniformly applied side extrusion force.

[0052] The contact area between the aforementioned clamps and the side surface of the disposable ink bag can be gradually changed as the control drive assembly drives the side extrusion assembly. The maximum proportion of the length of the side surface of the disposable ink bag and the side extrusion assembly along the axial direction of the long cavity structure to the length of the disposable ink bag along the axial direction of the long cavity structure is greater than or equal to the starting extrusion threshold. As shown in the following formula:

[0053]

[0054] In this formula, i can be 1, 2, H s1 , H s2 It can be the length of the left contact area and the right contact area of ​​the side surface of the disposable ink bag and the side extrusion component along the axial direction of the long cavity structure when the first extrusion begins. Please refer to Figure 3 , at this time H s1 =L1;H sac h may be the length of each contact area between the side surface of the disposable ink bag and the side extrusion assembly in the axial direction of the long cavity structure; s1 、h s2 It can be the (first) squeeze threshold of the left contact area and the squeeze threshold of the right contact area. If the cavity of the disposable ink bag is a cylinder, then H sac The height of the column, H s1 is the left contact area of ​​the left splint on the cylindrical surface of the column, H s2 It is the right contact area of ​​the right clamping plate on the cylindrical surface of the cylinder. Therefore, when the extrusion starts, the left and right clamping plates are in full contact with the disposable ink bag, and a sufficient projection overlap area (also called clamping plate alignment area) is provided for the side extrusion process of the four-connection structure, providing a basis for maintaining uniform extrusion force.

[0055] Before the extrusion begins, the area of ​​each contact area can be the largest. Maintaining an initial area of ​​appropriate size (determined by the starting extrusion threshold, and the width of the contact area is fixed) can provide sufficient force surface area for the splint side to squeeze the disposable ink bag, so that the splint in the contact area on this side can provide an extrusion force that is basically stable rather than elastically fluctuating during the extrusion process.

[0056] As the extrusion proceeds, the area of ​​the contact region may gradually decrease (or the clamp slides and the area of ​​the region remains unchanged). At the end of the extrusion, the minimum proportion of the length of each contact region along the axial direction of the long cavity structure to the length of the disposable ink bag along the axial direction of the long cavity structure is greater than or equal to the end extrusion threshold. As shown in the following formula:

[0057]

[0058] In this formula, i can be 1, 2, H e1 , H e2 It can be the length of the left contact area and the right contact area along the axial direction of the long cavity structure at the end of the last extrusion. Please refer to Figure 3 , at this time H e1 =L2;H sac h may be the length of each contact area between the side surface of the disposable ink bag and the side extrusion assembly in the axial direction of the long cavity structure; e1 、h e2It can be the end extrusion threshold of the left contact area (last time, material printing is completed) and the end extrusion threshold of the right contact area. In this way, the left and right clamps can fully contact with the disposable ink bag during the extrusion process before the end, and provide a sufficient projection overlap area (also called clamp alignment area) for the side extrusion process of the four-connection structure.

[0059] At this time, the area of ​​each contact area can be the smallest, and a suitable end area (determined by the end extrusion threshold) is maintained, so that the extrusion force between the clamps can basically remain stable from beginning to end during the extrusion process, rather than an elastically fluctuating extrusion force, to avoid the occurrence of misalignment (the area of ​​the aforementioned overlapping projections is too small or completely disappears) extrusion, which leads to interruption or uneven discharge of the disposable ink sac. The appropriate initial area and end area can keep the overlapping projection area (or the clamp alignment area) relatively stable from beginning to end, thereby ensuring the uniformity of the extrusion force applied by the four-connection structure in the side extrusion assembly to the side surface of the disposable ink sac.

[0060] It should be noted that the extrusion thresholds corresponding to the aforementioned left and right contact areas may be the same or different. According to the product application scenarios selected based on the different lengths of the splints and the lengths of the cavity structures, the aforementioned start extrusion threshold of one of the aforementioned contact areas may be greater than or equal to the end extrusion threshold. The start extrusion threshold and the end extrusion threshold can be determined based on the test results of printing ordinary materials on test samples manufactured with the design dimensions, so that the design dimensions and the threshold sizes can be adjusted to obtain appropriate start extrusion thresholds and end extrusion thresholds corresponding to the design dimensions. For example, in some possible products, the first start extrusion threshold corresponding to the left and right contact areas may be above 0.7, the last end extrusion threshold may be above 0.6, and the last end extrusion threshold should not be lower than 0.5.

[0061] The aforementioned four-connection structure may be placed as a whole in the long cavity structure. The distance in the axial direction of the long cavity structure between the position point of one end of any one of the left and right splints before the start of the first extrusion and the position point of the other end after the end of the last extrusion may be smaller than the inner height of the cavity of the long cavity structure (axially). At the same time, in the axial direction perpendicular to the long cavity structure, the overall width of the four-connection structure and the disposable ink bag after being filled with printing material is smaller than the minimum inner width of the cavity of the long cavity structure (perpendicular to the axial direction, for example, the inner width corresponding to the aforementioned hand-held area is the minimum inner width of the cavity of the long cavity structure). Therefore, there is no need for an external pressing structure, and the user only needs to consider the work structure and configuration of the printing material, without considering the extrusion pressure required for uniform discharge.

[0062] In some possible implementations, in order to facilitate the user to quickly fill the next disposable ink bag, a reset structure can be provided in the side extrusion assembly without twisting the four-connection structure with force.

[0063] In some possible examples, the reset structure may be composed of a (non-elastic) drawstring and a buckle, the buckle may be fixed to the inner wall of the long cavity structure, one end of the drawstring is sleeved on the buckle, and the other end of the drawstring may be connected to the lower end of the first of the left and right clamps, for example, the other end of the drawstring is connected to the lower end (active connection position) of the left clamp in the four-connection structure. As for the length of the drawstring, the drawstring may be kept in a relaxed state at the beginning and during the extrusion and at the end of the last extrusion, and when the user needs to reset the four-connection structure to reload the next disposable ink bag, the control drive assembly may be set in a reset state, and the user may pull the drawstring to reset the side extrusion assembly to the maximum distance between the clamps.

[0064] For some possible examples, see Figure 1 or Figure 3 , the lower end of the first clamping plate of the left clamping plate 3 and the right clamping plate 14 is connected to the inner wall of the long cavity structure B through the telescopic spring 2. At the beginning of (side) extrusion, the central axis of the telescopic spring 2 is parallel to the axial direction of the long cavity structure B. The length of the telescopic spring 2 at the beginning of extrusion can be much smaller than the plate length of the clamping plate, for example, the plate length of the clamping plate is greater than ten times or more of the length of the telescopic spring at the beginning of extrusion. The component force of the elastic force of the telescopic spring 2 at the end of the last (side) extrusion in the axial direction perpendicular to the long cavity structure B can be much smaller than the extrusion force between the clamping plates at the end of the last extrusion, for example, the extrusion force between the clamping plates at the end of the last extrusion is greater than ten times or more of the elastic force of the telescopic spring 2 at the end of the last extrusion. Therefore, when the user needs to reset the four-connection structure 4 to refill the next disposable ink bag 8, the control drive assembly can be set to the reset state, and the user only needs to wait for the control drive assembly to automatically perform the reset movement, so that the control drive assembly drives the four-connection structure 4 to reset under the constraint of the telescopic spring 2, without manual operation, which further improves the convenience of use.

[0065] The aforementioned four-connection structure may be a structure in which at least one pair of connection points at diagonal connection positions are respectively connected to the inner wall of the long cavity structure and to the control drive assembly. As mentioned above, the lower end of the left clamp (the connection point connected to the lower connecting rod) is connected to the inner wall of the long cavity structure through the aforementioned telescopic spring, and the upper end of the right clamp (the connection point connected to the upper connecting rod) is connected to the control drive assembly. In addition, the lower end of the right clamp (the connection point connected to the lower connecting rod) in the aforementioned four-connection structure may be connected to the inner wall of the long cavity structure in an up-and-down sliding direction (for example, through a slide rail), while the upper end of the left clamp (the connection point connected to the upper connecting rod) in the aforementioned four-connection structure may not be connected to the inner wall of the long cavity structure, and can be designed according to size selection, product needs and test results.

[0066] Please refer to Figure 3The upper connecting rod and the lower connecting rod in the aforementioned four-connection structure 4 can be fixedly connected to the inner wall of the long cavity structure B, and can apply a driving force on one corner of the four-connection structure 4, providing a fulcrum for driving the entire four-connection structure 4 to apply a uniform side extrusion force to the side surface of the disposable ink bag 8. The inner wall of the long cavity structure B can be provided with an upper support structure 13 and a lower support structure ( Figure 3 The midpoint of the connecting rod shown in dotted line in the middle lower part is the lower support structure); the upper connecting rod is connected to the upper support structure 13, the lower connecting rod is connected to the lower support structure, and the upper end of the second clamping plate of the left clamping plate 3 and the right clamping plate 14 is connected to the control drive assembly, which is used to drive the upper end of the second clamping plate to move while rotating around the corresponding support structure through the upper connecting rod and the lower connecting rod, so that the distance between the left clamping plate 3 and the right clamping plate 14 is reduced to apply pressure to the side surface of the disposable ink bag 8.

[0067] In order to further improve the uniformity of the extrusion force on the side surface of the disposable ink bag squeezed by the left and right clamping plates, the geometric midpoint of the upper connecting rod can be connected to the upper support structure, and the geometric midpoint of the lower connecting rod can be connected to the lower support structure. The straight line direction between the connection points of the upper support structure and the lower support structure and the corresponding connecting rod can be distributed along the axial direction of the long cavity structure. The upper support structure and the lower support structure can both be columnar structures perpendicular to the inner wall plane of the long cavity structure, and the upper support structure and the lower support structure can also be perpendicular to the plane where the corresponding connecting rod is located, and the diameters of the upper support structure and the lower support structure are both close to the cross-sectional diameter of the corresponding connecting rod (slightly larger, slightly smaller, equal).

[0068] It can be understood that the aforementioned first clamp is any one of the left and right clamps, and the second clamp is another clamp other than the one. For example, if the lower end of the left clamp is connected to the inner wall of the long cavity structure through a telescopic spring, and the lower end of the right clamp is not connected to the inner wall of the long cavity structure through a slide rail, then when the control drive assembly is driven, the upper end of the right clamp can trigger the initial downward movement direction, and under the fulcrum effect of the upper support structure, the fixing effect of the control drive assembly, and the connecting effect of the upper connecting rod, the upper end of the right clamp can move downward along the axial straight line direction of the long cavity structure and rotate clockwise around the upper support structure at the same time, and the lower end of the right clamp can rotate clockwise around the lower support structure, thereby driving the upper and lower ends of the left clamp to rotate clockwise around the corresponding support structure, so that the distance between the left and right clamps is reduced, and a side extrusion force is applied to the side surface of the disposable ink sac, and there is no need to control the drive assembly to apply an extrusion force from the upper end of the disposable ink sac.

[0069] In the embodiments of this specification, in order to improve the integration and portability of the handheld 3D printer, the control drive assembly can be built into the long cavity structure of the spray gun structure. In order to further increase the operating space of the drive element, the drive element in the control drive assembly can also be partially extended out of the long cavity structure. Whether the specific drive element extends out of the long cavity structure can be determined based on the size of the cavity structure and the volume of the disposable ink sac, combined with the structural selection of the drive element and the test use effect. The handheld 3D printer may also include:

[0070] A control drive assembly is arranged on the spray gun structure and connected to the side extrusion assembly, and is used to drive the side extrusion assembly to apply pressure to the side surface of the disposable ink bag, so that the disposable ink bag deforms and discharges the material, so as to spray the printing material through the nozzle.

[0071] In some possible implementations, the aforementioned control drive component may adopt a rigid telescopic structure.

[0072] In some preferred examples, in order to realize a simple and lightweight handheld device, please refer to Figure 1 or Figure 3 The control drive assembly may include a motor controller 5 and an electric screw connected to the motor controller, the electric screw includes a screw 6 and a driving component 7 for driving the screw 6, the long cavity structure B may also include an installation area located above the four-connection structure, and the installation area is used to set the control drive assembly; the screw 6 of the electric screw is connected to the upper end of the second splint between the left splint and the right splint along the axial direction of the long cavity structure B.

[0073] Please combine Figure 1 , Figure 2 and Figure 3, the aforementioned motor controller 5 and the driving components 6 (guide sleeves, gears, motors, etc.) of the electric screw can be fixedly connected to the inner wall of the long cavity structure B by fasteners / snaps. The arrangement direction of the screw 6 in the electric screw can be along the axial direction of the long cavity structure and pass through the connection point at the upper end of the second clamp. In order to further increase the side extrusion amplitude of the disposable ink sac, the electric screw can have a longer length, and a part of the screw 6 of the electric screw can be arranged inside the long cavity structure, and the other part can extend out of the upper end of the long cavity structure B and be exposed outside the spray gun structure H, so that it has a longer movement range, which can fully drive the four-connection structure to deeply extrude the side surface of the disposable ink sac 8, greatly increasing the maximum extrusion amplitude (in the axial direction perpendicular to the long cavity structure, the difference between the maximum radius of the disposable ink sac when the first extrusion starts to the maximum radius of the disposable ink sac when the last extrusion can be used as this maximum extrusion amplitude). In some advantageous examples, the end of a portion of the screw 6 of the electric screw that is exposed outside the spray gun structure can be sleeved with a small rubber ball (the diameter of which can be more than 10 times smaller than the screw length) or other soft protective parts to ensure the safety of the user.

[0074] It should be noted that the above-mentioned control drive component can be a preferred implementation method, but not the only limited implementation method. The above-mentioned electric screw can also be replaced with a micro electric hydraulic rod according to the product printing accuracy requirements, design costs and test usage effects, and it can also smoothly push one connection point of the above-mentioned four-connection structure in a straight line.

[0075] The aforementioned motor controller may include a circuit board and a controller arranged on the circuit board. The circuit board may also be provided with a battery installation position, or may also be provided with optional modules such as a rechargeable battery and a wireless charging module. These modules can be arranged within the spray gun structure, with high integration and portability.

[0076] In the embodiments of the present specification, in order to further facilitate the user to print materials and match the needs of actual printing works, an operating component can be set on the spray gun structure.

[0077] For some possible implementations, see Figure 1 or Figure 3The spray gun structure H may also include an operating component 9 disposed on the outer surface of the long cavity structure B, which is used to operate the control drive component to select the printing rate and control the printing switch. The operating component 9 may be a touch electronic screen or a physical button connected to the aforementioned motor controller 5. For example, the printing rate may be selected as 20 mm / s, 40 mm / s or 60 mm / s. The operating component 9 may provide the user with touch buttons or physical buttons corresponding to low, medium and high printing rates at different rates, thereby sending an instruction to select the printing rate to the motor controller 5. The motor controller 5 may determine the instruction of the electric screw movement rate corresponding to the currently selected printing rate based on the instruction, thereby determining the speed of the electric screw to push the four-connection structure to move, and the drive side extrusion component to extrude the printing material in the disposable ink bag 8 by the four-connection structure according to the currently selected printing rate.

[0078] In the embodiments of this specification, in order to further facilitate the user to print the material with consistent discharging direction and ensure that the discharging end of the disposable ink bag is fixed during the side extrusion process, a limit block can be set in the spray gun structure.

[0079] The spray gun structure may further include a limiting block disposed in the long cavity structure, for fixing the short cavity structure of the disposable ink bag in an axial position region in the long cavity structure.

[0080] For example, multiple limit blocks can be set. Please refer to Figure 3 The first stopper 10 can be disposed in the discharge area of ​​the disposable ink bag 8 in the long cavity structure B. The maximum diameter of the discharge area can be smaller than the diameter of the column part of the disposable ink bag 8 and the minimum diameter can be larger than the maximum diameter of the aforementioned nozzle 1. The lower end of the discharge area is the nozzle 1 of the disposable ink bag 8. The first stopper 10 can be matched with the discharge area of ​​the disposable ink bag 8 in configuration, and the surface of the discharge area of ​​the disposable ink bag 8 can be closely fitted with the inner surface of the hollow area in the first stopper 10. For example, the hollow area of ​​the first limit block 10 is in the shape of an inverted cone (compared with the cone at the apex of a cone, the diameter difference between the top and bottom of the inverted cone is smaller), and the discharge area of ​​the disposable ink bag 8 can be in the shape of an inverted cone. The discharge area of ​​the disposable ink bag 8 can be placed in the hollow area of ​​the first limit block 10 and the surface is tightly fitted, so that the first limit block 10 supports the disposable ink bag 8 and forms a constraint on the central axis direction of the discharge area, so that during the side extrusion process, the central axis of the discharge area is colinear with the central axis of the nozzle 1, thereby avoiding the discharge direction deviation caused by the displacement of the cavity part of the disposable ink bag 8 during the side extrusion process.

[0081] Please refer to Figure 3, a second stopper 12 can be provided, and the second stopper 12 can be provided on the inner wall of the long cavity structure B, and the distance from the lower surface of the second stopper 12 to the lowest end of the nozzle 1 of the disposable ink bag 8 can be equal to the overall length (including the nozzle) of the disposable ink bag 8, so that the upper end position of the disposable ink bag 8 placed in the long cavity structure B in the spray gun structure H is just fixed, and the disposable ink bag 8 is prevented from being displaced upward significantly during the extrusion process. It can be understood that according to product needs and test results, stoppers can be added or not provided, and multiple ring buckles can be provided in the spray gun structure H, and the disposable ink bag can be fixed by multiple ring buckles, or a net bag can be provided at the upper end of the disposable ink bag 8 in the spray gun structure H, which can also achieve fixation.

[0082] The handheld 3D printer in the embodiment of this specification can be applied to 3D food printing, that is, the printed material can be food. Under the driving action of the control drive component, the inner extrusion component of the spray gun structure performs side extrusion on the disposable ink bag carrying the printing material in the spray gun structure, and realizes uniform extrusion of the material through the splint of the four-connection structure arranged in the narrow space in the long cavity structure, with good and consistent discharge directionality and uniformity of discharge amount. In addition, the control drive component is equipped with a variety of printing rates for users to choose through the operating component, which can provide a rich discharge speed for food printing works. At the same time, the nozzle support of the disposable ink bag has different diameters, and can print food with different precisions. The printer in the embodiment of this specification is small in size, simple to operate, easy to carry, and less restricted by time and space. The general public can make 3D printed food by holding a 3D printer in hand. It is easy to use. Even children and ordinary adults can achieve smooth and uniform discharge operations like professionals, and have good market application prospects and promotion.

[0083] The embodiment of this specification also provides printing materials of a handheld 3D printer under the same inventive concept as the above embodiment, wherein the handheld 3D printer is the handheld 3D printer in the above embodiment, and the printing materials are carried by a disposable ink bag in the handheld 3D printer;

[0084] In the embodiments of the present specification, the printing material may be prepared from food, or from food and food supplementary materials.

[0085] In some possible implementations, there may be one or more foods for preparing the printed material, and there may also be one or more food supplementary materials for preparing the printed material. The food supplementary materials may include edible flowers and fruits with natural colors, etc., and the food supplementary materials should not include additives that are harmful to the human body. The printed material may be a non-solid material, nor a high-fluidity liquid material. The viscosity value range of the printed material is 600Pa.s to 1040Pa.s, which is only for example. There are many types of food and even more combinations. With the increase of test foods and food and supplementary material combinations as printed material samples and changes in the ratio with water, juice, or dairy products, the range may be expanded to a certain extent. The printed material is a high-viscosity material such as a viscous substance, a paste, a gel, or a non-liquid thick suspension. The printed material may be a material that can be eaten directly or needs to be heated and cooked.

[0086] In the first example of printing material, the printing material of the handheld 3D printer in the above embodiment is cocoa pumpkin 3D premixed powder. Cocoa powder, pumpkin powder, icing sugar (or white sugar), and yogurt are mixed evenly according to 1:3.6:1:12.5 to make cocoa pumpkin material, sieve, fill into a disposable ink bag, and seal it. The nozzle diameter of the handheld 3D printer is preferably 0.8mm, and the printing speed is preferably 15mm / s.

[0087] In the second example of printing material, the printing material of the handheld 3D printer in the above embodiment is strawberry buckwheat premixed powder, strawberry powder, superfine buckwheat powder, and yogurt are mixed in a ratio of 1:1:5 to make strawberry buckwheat material, sieved, filled into a disposable ink bag, and sealed for printing. The nozzle diameter of the handheld 3D printer is preferably 0.8mm, and the printing speed is preferably 15mm / s.

[0088] In the third example of printing material, the printing material of the handheld 3D printer in the above embodiment is rose rice cloth. In terms of mass percentage, 71% milk, 14% rice flour, and 15% rose jam are mixed into rose milk rice paste, and a small amount of rose pollen (0.1% of the total weight) and dragon fruit powder (0.3% of the total weight) are added for coloring and seasoning, fully mixed, stirred over high heat until completely gelatinized and dissolved, boiled, turned down to low heat and simmered until viscous, and after completion, left to cool slightly to form a gel, and filled into a disposable ink sac evenly and without gaps. The nozzle diameter of the handheld 3D printer is preferably 0.8mm, and the printing speed is preferably 15mm / s.

[0089] The raw materials for preparing the printing materials can be completely taken from the recipes of the general public and can be purchased from ordinary stores without the need for special materials and additives.

[0090] The present specification also provides a printing method of a handheld 3D printer under the same inventive concept as the above embodiment. The handheld 3D printer is the handheld 3D printer in the above embodiment. The spray gun structure in the above handheld 3D printer is a detachable cavity structure to facilitate the loading of a disposable ink bag. For example, Figure 1 , Figure 2 and Figure 4 , the printing method may include:

[0091] S1, selecting the caliber of the nozzle 1 of the disposable ink bag 8, filling the disposable ink bag 8 with the printing material prepared in the above embodiment, and installing the disposable ink bag 8 filled with the printing material into the spray gun structure H, so that the side extrusion component contacts the side surface of the disposable ink bag 8;

[0092] S2, selecting the printing rate through the operating component 9 on the spray gun structure H;

[0093] S3, starting the handheld 3D printer. The handheld 3D printer can respond to the user's operation by driving the side extrusion component in the handheld 3D printer to move, so as to extrude the disposable ink bag 8 in the handheld 3D printer, and spray the printing material M from the spray gun structure H in the handheld 3D printer to the carrying platform L, so as to form the printing construction material;

[0094] S4, the handheld 3D printer can be moved along the path desired by the operator to print a stacking combination of construction materials on a carrying platform L (such as a planar structure such as a dinner plate or a baking tray), and the stacking combination can be a formed three-dimensional printed structure.

[0095] S5, the three-dimensional printed structure on the carrier platform L can be subjected to a curing treatment step, which is used to further surface treat and / or strengthen the printed three-dimensional structure to improve its physical properties and aesthetics, such as natural drying, microwave heating, baking and other curing treatments. The above printing steps are only examples, and the user can arrange the printing steps according to actual printing needs, and does not need to refer to them alone.

[0096] In the implementation of the printing method in the embodiments of this specification, the material printing process can only have an extrusion process, there is no heating step, and no printer frame is required. Ordinary people can use a handheld 3D printer to print along the desired path. The handheld 3D printer has good consistency in the output direction and uniform output, and the general public can also easily print the desired 3D printed food.

[0097] In the embodiments of this specification, the terms such as "long", "short", "left", and "right" are relative concepts of component characteristics for easy intuitive understanding in the drawings, and are not limitations of the corresponding component names.

[0098] It should also be noted that the aforementioned terms such as first (one), second (one), etc. are only used for distinguishing descriptions and do not indicate limitations such as order and importance. The terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, commodity, or device including elements in the present disclosure includes not only those elements, but also includes the coordination of other elements not explicitly listed, or also includes elements inherent to such process, method, commodity, or device.

[0099] In the printing implementation process, some or all of the steps of the above method can be completed by the hardware integrated logic circuit in the processor or the instructions in the form of software. The above processor can be an integrated circuit chip with signal processing capabilities. The processor can also be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of this specification can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of this specification can be directly embodied as a hardware decoding processor to be executed, or a combination of hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0100] The present invention has been described above with reference to the embodiments of this specification. Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of this specification. Without departing from the scope of this disclosure, a person of ordinary skill in the art can make a variety of substitutions and modifications, and these substitutions and modifications should all fall within the scope of this disclosure.

Claims

1. A handheld 3D printer, characterized in that: include: A disposable ink bag, configured as a short cavity structure with a nozzle, for carrying printing materials; The spray gun structure comprises a long cavity structure and a nozzle stopper fixed to the discharge end of the long cavity structure, the cavity part of the short cavity structure is arranged in the long cavity structure, and the nozzle is fixed by the nozzle stopper and extends out of the long cavity structure; A side extrusion assembly connected to the inner wall of the long cavity structure and also in contact with the side surface of the disposable ink bag along the axial direction of the long cavity structure; A control drive assembly is arranged on the spray gun structure and connected to the side extrusion assembly, and is used to drive the side extrusion assembly to apply pressure to the side surface of the disposable ink bag, so that the disposable ink bag deforms and discharges the material, so as to spray the printing material through the nozzle.

2. The handheld 3D printer according to claim 1, characterized in that: The maximum proportion of the length of each contact area between the side surface of the disposable ink bag and the side extrusion assembly in the axial direction of the long cavity structure to the length of the disposable ink bag in the axial direction of the long cavity structure is greater than or equal to the extrusion start threshold; The minimum proportion of the length of each contact area along the axial direction of the long cavity structure to the length of the disposable ink bag along the axial direction of the long cavity structure is greater than or equal to the extrusion end threshold.

3. The handheld 3D printer according to claim 2, characterized in that: The disposable ink sac is made of food grade hose material; The diameter of the nozzle is selected to be 0.8 mm, 1 mm or 1.2 mm.

4. The handheld 3D printer according to claim 1, characterized in that: The side extrusion assembly includes a four-connection structure and a reset structure, wherein the four-connection structure includes a left clamping plate, a right clamping plate, an upper connecting rod, and a lower connecting rod; The upper and lower ends of the left clamping plate are movably connected to the corresponding ends of the right clamping plate through an upper connecting rod and a lower connecting rod respectively to form a quadrilateral; The left clamping plate and the right clamping plate are both in contact with the side surface of the disposable ink bag; The lower end of the first one of the left clamping plate and the right clamping plate is connected to the inner wall of the long cavity structure through the reset structure.

5. The handheld 3D printer according to claim 4, characterized in that: The inner wall of the long cavity structure is provided with an upper support structure and a lower support structure arranged along the axial direction of the long cavity structure; The upper connecting rod is connected to the upper support structure, the lower connecting rod is connected to the lower support structure, and the upper end of the second clamping plate of the left clamping plate and the right clamping plate is connected to the control drive assembly, which is used for driving the upper end of the second clamping plate to move while rotating the upper connecting rod and the lower connecting rod around the corresponding support structure, so that the distance between the left clamping plate and the right clamping plate is reduced to apply pressure to the side surface of the disposable ink bag.

6. The handheld 3D printer according to claim 4 or 5, characterized in that: The long cavity structure also includes an installation area located above the four-connection structure, and the installation area is used to set the control drive component; The control drive assembly includes a motor controller and an electric screw connected to the motor controller; The electric screw is connected to the upper end of the second clamping plate of the left clamping plate and the right clamping plate along the axial direction of the long cavity structure; The motor controller is provided with a rechargeable battery and a wireless charging module.

7. The handheld 3D printer according to claim 1, characterized in that: The spray gun structure also includes an operating component disposed on the outer surface of the long cavity structure, which is used to operate the control drive component to select a printing rate and control a printing switch; The printing speed is selected as 20 mm / s, 40 mm / s or 60 mm / s.

8. The handheld 3D printer according to claim 1, characterized in that: The spray gun structure further comprises a limiting block arranged in the long cavity structure, which is used for fixing the disposable ink bag in an axial position area in the long cavity structure.

9. A printing material for a handheld 3D printer, characterized in that: The handheld 3D printer is a handheld 3D printer according to any one of claims 1 to 8, and the printing material is carried by a disposable ink bag in the handheld 3D printer; The printing material is prepared from food, or from food and food supplementary materials.

10. A printing method for a handheld 3D printer, characterized in that: The handheld 3D printer is a handheld 3D printer according to any one of claims 1 to 8, and the printing method comprises: In response to user operation, the control drive component in the handheld 3D printer drives the side extrusion component to move, so as to squeeze the disposable ink bag in the handheld 3D printer, and spray the printing material from the spray gun structure in the handheld 3D printer to the carrying platform to form a printing construction material; wherein, Before the user operates, the disposable ink bag carries the printing material of the handheld 3D printer of claim 9 filled therein; The carrying platform is used to carry a stacked combination of printed construction materials, and the stacked combination is cured to form a 3D printed food.

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