Feeding mechanism of 3D printing device

Abstract

The feeding mechanism of the 3D printing device comprises a liquid adding box, a C-opening isolation cover is integrally formed on the inner wall of one side of the liquid adding box, the interior of the liquid adding box is divided into a cavity and a resin groove through the C-opening isolation cover, the resin groove is used for containing photosensitive resin, a bottom plate is fixed in the cavity, and the bottom plate is used for containing the photosensitive resin; a liquid storage box is installed at the top end of the bottom plate, and a multi-layer H-shaped liquid injection structure used for forming a plurality of feeding points at different heights is installed on the inner wall of the liquid adding box. The photosensitive resin liquid simultaneously enters the resin tank from different directions, uniform concentration distribution of the resin liquid in the whole resin tank is guaranteed, the curing effect in the printing process is improved, the resin liquid enters the resin tank in a multi-point supply mode, a light source can more effectively irradiate each feeding point, and the printing efficiency is improved. Therefore, a faster photocuring process is realized, and the phenomena of insufficient illumination and incomplete curing reaction in some areas are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of light-curing 3D printers, and in particular to a feeding mechanism of a 3D printing device. Background Art

[0002] A photocurable 3D printer is a device that uses photopolymerization technology for additive manufacturing. Its core principle is to irradiate photosensitive resin with ultraviolet light to solidify it into the desired three-dimensional object in a short time. Its main structural components include light source, resin tank, printing platform, control system, and cleaning and post-processing device. The light source is the core component of a photocurable 3D printer. Ultraviolet LED or laser is usually used. These light sources activate the photoinitiator in the photosensitive resin by emitting light of a specific wavelength to start the photopolymerization reaction. The resin tank is used to hold the photosensitive resin and is usually made of transparent material to ensure that the light can effectively penetrate and irradiate the resin. The design of the resin tank must have good sealing to prevent the resin from volatilizing or contaminating, while ensuring high light transmittance to improve printing efficiency. The printing platform is the basis for printing objects and is designed to move up and down so that the printer can automatically adjust the height after each layer is completed to print the next layer. The printing platform is usually made of corrosion-resistant and easy-to-demold materials to ensure the smooth removal of the finished product. In this process, a feeding mechanism is also used to ensure the timely supply of photosensitive resin; For example, a novel automatic feeding mechanism for a photocurable 3D printer disclosed in the authorization announcement number CN214324183U includes a printer housing and a feeding control system, wherein a resin tank is fixedly arranged inside the printer housing, a photosensitive resin is arranged inside the resin tank, a one-way valve is fixedly connected to the left side of the resin tank, a peristaltic pump and an auxiliary material box are fixedly installed inside the printer housing, the output end of the peristaltic pump is connected to the input end of the one-way valve through a feeding pipe, and the output end of the peristaltic pump is connected to the bottom of the auxiliary material box through a conduit, and it is mainly designed by the coordination of an infrared laser, a photosensitive plate, a single-chip microcomputer control module and a peristaltic pump. When the liquid level of the photosensitive resin in the resin tank is lower than the monitoring value, the peristaltic pump can be controlled by the single-chip microcomputer control module to work, and the peristaltic pump transports the photosensitive resin in the auxiliary material box to the inside of the resin tank to feed the inside of the resin tank. When the surface liquid level of the photosensitive resin in the resin tank rises to a normal value, the peristaltic pump is controlled by the single-chip control module to stop working, so that the automatic feeding of the 3D printer can be realized. However, when the peristaltic pump is used to pump the photosensitive resin into the resin tank, the above technical solution is a single-point feeding form. Since the density of the photosensitive resin liquid in the resin tank is different from the density of the unused photosensitive resin liquid in the auxiliary material tank, the density of the photosensitive resin liquid near the peristaltic pump will be different from that of the surrounding resin liquid. In addition, since the photosensitive resin is not easy to be stirred or disturbed during the printing process, an uneven density distribution is formed. The density difference of the resin liquid will cause the boundary between the photocuring reaction area and the uncured area to be blurred. The uncured photosensitive resin may not be fully cured under the irradiation of the light source, thereby affecting the strength and stability of the printed product and the subsequent printing process. Summary of the invention

[0003] The object of the present invention is to provide a feeding mechanism for a 3D printing device, wherein a cavity and a resin tank isolated from each other are opened inside a liquid adding box, and a liquid storage box with a pulley liquid mixing module is installed inside the cavity. When the photosensitive resin liquid in the liquid storage box needs to be added to the resin tank, the pump liquid feeding unit sends the photosensitive resin liquid in the liquid adding box into the multi-level H-type liquid injection structure through a pipeline liquid guiding structure. The multi-level H-type liquid injection structure forms several layers of surrounding feeding points in the resin tank, so that the photosensitive resin liquid enters the resin tank in a multi-point supply manner for subsequent photocuring, so as to solve the problems of the device proposed in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a feeding mechanism of a 3D printing device, comprising: A liquid adding box, wherein a C-port partition cover is integrally formed on the inner wall of one side of the liquid adding box, the C-port partition cover divides the interior of the liquid adding box into a cavity and a resin tank, the resin tank is used to accommodate photosensitive resin, a bottom plate is fixed inside the cavity, and a liquid storage box is installed on the top of the bottom plate, a multi-level H-type liquid injection structure for forming a plurality of feeding points at different heights is installed on the inner wall of the liquid adding box, a pump liquid feeding unit interconnected with the feeding end of the multi-level H-type liquid injection structure is installed on the inner wall of one side of the liquid adding box, and a pipeline liquid guide structure interconnected with the feeding end of the pump liquid feeding unit is installed on one side of the bottom end of the liquid storage box; A pulley liquid mixing module is installed inside the liquid storage box and is used to keep the photosensitive resin inside the liquid storage box in an active state. A central controller is installed on the inner wall of one side of the C-port partition cover, and the output end of the central controller is electrically connected to the pump liquid feeding unit and the input end of the pulley liquid mixing module.

[0005] Preferably, a liquid injection nozzle connected to the liquid storage box is installed on one side of the top of the liquid storage box, and an electric heating rod 1 is installed on the top of the liquid storage box, and the input end of the electric heating rod 1 is electrically connected to the output end of the central controller.

[0006] Preferably, a linear sealing cover is integrally formed at the bottom end of the liquid adding box, a rectangular cavity isolated from the resin tank is arranged inside the linear sealing cover, an electric heating rod 2 is installed inside the rectangular cavity, and the input end of the electric heating rod 2 is electrically connected to the output end of the central controller.

[0007] Preferably, the pump liquid feeding unit comprises a gear pump installed on the inner wall of one side of the liquid adding box, a U-shaped tube installed at the output port of the gear pump, and an electromagnetic switch valve installed at one end of the surface of the U-shaped tube.

[0008] Preferably, the multi-level H-type liquid injection structure includes a plurality of H-shaped square-mouth profile tube groups installed on the inner wall of the liquid adding box at equal intervals and a vertical tube installed between two adjacent H-shaped square-mouth profile tube groups, the vertical tube being used to keep the two adjacent H-shaped square-mouth profile tube groups in a liquid conduction state, a plurality of liquid outlet holes are opened on the inner walls around the H-shaped square-mouth profile tube groups, and one end of the U-shaped tube extends to the interior of one of the H-shaped square-mouth profile tube groups.

[0009] Preferably, the H-shaped square-mouth profile tube group consists of a front profile tube, a rear profile tube and a longitudinal profile tube. The front profile tube and the rear profile tube are installed in parallel on the front and rear inner walls of the liquid adding box, and the longitudinal profile tube is installed between the front profile tube and the rear profile tube so that the front profile tube and the rear profile tube are in a liquid conduction state.

[0010] Preferably, the pipeline liquid guiding structure includes an S-shaped liquid outlet pipe installed at the bottom end of the liquid storage box and a right-angle liquid lifting pipe installed on one side of the top end of the S-shaped liquid outlet pipe, and one end of the right-angle liquid lifting pipe away from the S-shaped liquid outlet pipe is interconnected with the inlet of the gear delivery pump, and the S-shaped liquid outlet pipe, the right-angle liquid lifting pipe, the gear delivery pump, the U-shaped tube and one of the longitudinal profile tubes form a passage.

[0011] Preferably, the number of the H-shaped square-mouth profile tube groups is three in total, and a circular tube cavity for the photosensitive resin to flow is provided inside the H-shaped square-mouth profile tube group.

[0012] Preferably, the pulley liquid mixing module includes a main stirring shaft rotatably installed on one side of the bottom of the liquid storage box, a stepper motor installed on the outer wall of one side of the liquid storage box, and a pulley reduction transmission structure installed at the output end of the stepper motor for driving the main stirring shaft to rotate.

[0013] Preferably, a plurality of T-shaped mixing arms of different heights are installed on the surface of the main stirring shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the feeding mechanism of the 3D printing device is provided with a multi-level H-type liquid injection structure, a pump liquid feeding unit, a liquid storage box, a belt wheel mixing module and other structures that cooperate with each other. The multi-level H-type liquid injection structure can form multiple feeding points in the resin tank, so that the photosensitive resin liquid enters the resin tank from different directions at the same time. Such a supply method can effectively avoid local oversaturation or deficiency of the resin liquid, and ensure that the resin liquid in the entire resin tank maintains a uniform concentration distribution. This uniformity not only helps to improve the curing effect during the printing process, but also improves the physical properties and stability of the finished product. Moreover, since the resin liquid enters the resin tank in a multi-point supply manner, the light source can more effectively irradiate each feeding point, thereby achieving a faster light curing process, avoiding the phenomenon of insufficient light in certain areas and incomplete curing reaction, and with the help of the belt wheel mixing module inside the liquid adding box, the photosensitive resin liquid is fully stirred and mixed in the liquid storage box, so that the resin liquid is transported to the resin tank through the pipeline liquid guide structure in a more uniform density, better adapting to the interlayer curing during the printing process, and ensuring the printing accuracy and the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the liquid storage box of the present invention; Figure 5Schematic diagram of the three-dimensional structure of the multi-level H-type liquid injection structure of the second embodiment of the present invention Figure 1 ; Figure 6 Schematic diagram of the three-dimensional structure of the multi-level H-type liquid injection structure of the second embodiment of the present invention Figure 2 ; Figure 7 This is a schematic diagram of the three-dimensional structure of the liquid storage box according to the third embodiment of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the pulley liquid mixing module according to the third embodiment of the present invention.

[0016] In the figure: 1, liquid adding box; 101, linear sealing cover; 102, electric heating rod 2; 2, C-port diaphragm; 3, cavity; 4, resin tank; 5, central controller; 6, liquid storage box; 601, bottom plate; 7, pump liquid adding unit; 701, gear delivery pump; 702, U-shaped pipe; 703, electromagnetic switch valve; 8, multi-level H-type liquid injection structure; 801, H-shaped square mouth profile pipe group; 8011, front profile pipe; 8012, rear profile pipe; 8013, longitudinal profile pipe; 802, vertical pipe; 803, liquid outlet; 9, electric heating rod 1; 10, liquid injection nozzle; 11, S-shaped liquid outlet pipe; 12, right-angle liquid lifting pipe; 13, pulley mixing module; 1301, main stirring shaft; 1302, T-shaped mixing arm; 1303, stepping motor; 1304, pulley reduction transmission structure. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0018] Embodiment 1, by Figures 1 to 4 The present invention comprises a liquid adding box 1, on the inner wall of one side of the liquid adding box 1, a C-port partition cover 2 is integrally formed, the C-port partition cover 2 divides the interior of the liquid adding box 1 into a cavity 3 and a resin tank 4, the resin tank 4 is used to accommodate photosensitive resin, a bottom plate 601 is fixed inside the cavity 3, and a liquid storage box 6 is installed on the top of the bottom plate 601, a multi-level H-type liquid injection structure 8 for forming a plurality of feeding points at different heights is installed on the inner wall of the liquid adding box 1, a pump liquid feeding unit 7 interconnected with the feeding end of the multi-level H-type liquid injection structure 8 is installed on the inner wall of one side of the liquid adding box 1, and a pipeline liquid guide structure interconnected with the feeding end of the pump liquid feeding unit 7 is installed on one side of the bottom end of the liquid storage box 6; The pulley liquid mixing module 13 is installed inside the liquid storage box 6 and is used to keep the photosensitive resin inside the liquid storage box 6 in an active state. A central controller 5 is installed on the inner wall of one side of the C-port partition cover 2. The output end of the central controller 5 is electrically connected to the pump liquid feeding unit 7 and the input end of the pulley liquid mixing module 13; A liquid injection nozzle 10 connected to the liquid storage box 6 is installed on one side of the top of the liquid storage box 6. When the staff adds photosensitive resin into the liquid storage box 6, the photosensitive resin liquid can be injected into the liquid storage box 6 through the setting of the liquid injection nozzle 10. An electric heating rod 9 is installed on the top of the liquid storage box 6. The input end of the electric heating rod 9 is electrically connected to the output end of the central controller 5. The photosensitive resin usually has a certain viscosity, and its fluidity directly affects the working efficiency of the pump liquid feeding unit 7 and the supply capacity of the resin. Through the heating of the electric heating rod 9, the temperature of the resin liquid is increased and the viscosity is reduced, thereby enhancing its fluidity, so that the photosensitive resin can be more easily transported to the resin tank through the pipeline liquid guide structure, ensuring the uniform supply of the resin during the printing process; A linear sealing cover 101 is integrally formed at the bottom of the liquid adding box 1. A rectangular cavity is provided inside the linear sealing cover 101 and is isolated from the resin tank 4. An electric heating rod 102 is installed inside the rectangular cavity. The input end of the electric heating rod 102 is electrically connected to the output end of the central controller 5. The linear sealing cover 101 separates the electric heating rod 102 from the resin liquid in the resin tank 4. At this time, the heat generated by the electric heating rod 102 is transferred to the resin liquid in the form of heat exchange by the linear sealing cover 101, so that the temperature of the resin liquid in the liquid adding box 1 and the liquid storage box 6 is consistent, reducing the non-uniformity of material properties caused by temperature difference, thereby improving the printing quality and consistency of the finished product, and the increase in temperature can increase the sensitivity of the resin to light, so that light can more quickly and effectively induce the polymerization reaction of the resin; The control system of the light-curing printer is bidirectionally electrically connected to the central controller 5 in the mechanism to achieve the purpose of controlling electrical components such as the electric heating rod 2 102, the pump liquid feeding unit 7, and the electric heating rod 1 9.

[0019] Embodiment 2, based on embodiment 1, Figure 5 and Figure 6The pump liquid feeding unit 7 includes a gear delivery pump 701 installed on the inner wall of one side of the liquid adding box 1, a U-shaped tube 702 installed at the output port of the gear delivery pump 701, and an electromagnetic switch valve 703 installed at one end of the surface of the U-shaped tube 702. The multi-level H-type liquid injection structure 8 includes a plurality of H-shaped square-mouth profile tube groups 801 installed on the inner wall of the liquid adding box 1 at equal intervals and a vertical tube 802 installed between two adjacent H-shaped square-mouth profile tube groups 801. The vertical tube 802 is used to keep the two adjacent H-shaped square-mouth profile tube groups 801 in a liquid path conduction state. The inner walls around the H-shaped square-mouth profile tube group 801 are provided with a plurality of There are three liquid outlet holes 803, one end of the U-shaped tube 702 extends to the inside of one of the H-shaped square-mouth profile tube groups 801, and there are three H-shaped square-mouth profile tube groups 801 in total. The inside of the H-shaped square-mouth profile tube group 801 is provided with a circular tube cavity for the photosensitive resin to flow. When the pump liquid feeding unit 7 conveys the resin liquid, the photosensitive resin is fed into the H-shaped square-mouth profile tube group 801 through the U-shaped tube 702 and the electromagnetic switch valve 703, and the remaining H-shaped square-mouth profile tube groups 801 in the vertical direction are connected by the vertical tube 802 for liquid conduction, and then the photosensitive resin is injected into the resin tank 4 through the liquid outlet hole 803; By providing multiple H-shaped square-mouth profile tube groups 801 and multiple liquid outlets 803, multi-point feeding is achieved in the resin tank to ensure that the resin is evenly distributed at different positions and heights, thereby avoiding the local oversaturation or undersaturation caused by traditional single-point feeding, and improving the utilization efficiency of the resin during the printing process. In addition, due to the design of multiple feeding points, the flow path of the resin in the tank becomes more complex and diversified, optimizing fluid dynamics and promoting the flow of the resin; The H-shaped square-mouth profile pipe group 801 is composed of a front profile pipe 8011, a rear profile pipe 8012 and a longitudinal profile pipe 8013. The front profile pipe 8011 and the rear profile pipe 8012 are installed in parallel on the front and rear inner walls of the liquid adding box 1. The longitudinal profile pipe 8013 is installed between the front profile pipe 8011 and the rear profile pipe 8012 to make the front profile pipe 8011 and the rear profile pipe 8012 in a liquid conduction state. The pipeline liquid conduction structure includes an S-shaped liquid outlet pipe 11 installed at the bottom end of the liquid storage box 6 and a right-angle liquid lifting pipe 12 installed on one side of the top end of the S-shaped liquid outlet pipe 11. The end of the right-angle liquid lifting pipe 12 away from the S-shaped liquid outlet pipe 11 is connected to the gear delivery pump 70 1 are connected to each other, and the S-shaped liquid outlet pipe 11, the right-angle liquid lifting pipe 12, the gear delivery pump 701, the U-shaped pipe 702 and one of the longitudinal profile pipes 8013 form a passage. When the pump liquid feeding unit 7 is working, the central controller 5 receives the electrical signal of the control system of the light-curing printer and sends the electrical signal to the gear delivery pump 701 and the electromagnetic switch valve 703. At this time, the gear delivery pump 701 generates suction and the electromagnetic switch valve 703 is in a normally open state. Then, the gear delivery pump 701 allows the photosensitive resin in the liquid storage box 6 to be delivered to the multi-level H-shaped liquid injection structure 8 through the S-shaped liquid outlet pipe 11, the right-angle liquid lifting pipe 12 and the U-shaped pipe 702; The S-shaped liquid outlet pipe 11 and the right-angle liquid lifting pipe 12 form a relatively smooth flow path, wherein the S-shaped liquid outlet pipe 11 helps to reduce eddy currents in the liquid flow process, allowing the resin to flow more smoothly, and the setting of the right-angle liquid lifting pipe 12 ensures that when the gear delivery pump 701 is no longer working, the resin liquid no longer enters the U-tube 702, the multi-level H-shaped liquid injection structure 8 and other components under the action of gravity. Through the design of the gear delivery pump 701 and the U-tube 702, the resin delivery speed can achieve a higher efficiency, making the resin supply during the printing process smoother and directly delivered to the multi-level H-shaped liquid injection structure 8, reducing printing interruptions caused by insufficient resin, thereby improving the overall printing efficiency.

[0020] Embodiment 3, based on embodiment 2, Figure 7 and Figure 8It is given that the pulley liquid mixing module 13 includes a main stirring shaft 1301 rotatably installed on one side of the bottom of the liquid storage box 6, a stepper motor 1303 installed on the outer wall of one side of the liquid storage box 6, and a pulley reduction transmission structure 1304 installed at the output end of the stepper motor 1303 for driving the main stirring shaft 1301 to rotate, and a plurality of T-shaped mixing arms 1302 of different heights are installed on the surface of the main stirring shaft 1301; in order to keep the photosensitive resin in the liquid storage box 6 in an active state, the stepper motor 1303 and the pulley reduction transmission structure 1304 are used to drive the main stirring shaft 1301 to rotate, and at this time, the T-shaped mixing arm 1302 rotates around the main stirring shaft 1301, and through continuous stirring, the uniformity of the temperature and composition of the photosensitive resin stored in the liquid storage box 6 is ensured, the precipitation and stratification of the resin are reduced, and the viscosity of the resin can be effectively reduced, and its fluidity is improved, so that the resin is smoother during the transportation process, and the working pressure of the pump liquid feeding unit 7 is reduced.

[0021] When the embodiment of the present application is in use, the staff first injects a sufficient amount of photosensitive resin into the liquid adding box 1 and the liquid storage box 6 in advance, and assembles the mechanism to the printing area of ​​the light-curing 3D printer. The C-port partition cover 2 is arranged inside the liquid adding box 1, so that a resin tank 4 for accommodating the photosensitive resin and a cavity 3 for accommodating the liquid storage box 6 are formed inside the liquid adding box 1, which are used to prevent photosensitive resins in different states from mixing with each other and ensure effective isolation between unused photosensitive resin and used resin. The liquid storage box 6 is equipped with a pulley mixing module 13, which continuously stirs the stored photosensitive resin to ensure its uniformity and fluidity. When photosensitive resin needs to be added to the resin tank 4, the control system of the light-curing printer will control the pump liquid feeding unit 7 to work, which is responsible for pumping the photosensitive resin liquid from the liquid storage box 6 and transporting it to the multi-level H-type liquid injection structure 8 through the pipeline liquid guide structure. In this process, the pump liquid feeding unit 7 can accurately control the flow rate and delivery according to the needs of the light-curing printer control system. Speed, ensure that the supply of resin matches the printing demand, and prevent printing problems caused by excessive or insufficient supply. The pipeline liquid guiding structure is a bridge connecting the pump liquid feeding unit 7 and the multi-level H-type injection structure 8, so that the photosensitive resin can effectively and quickly enter various positions of the multi-level H-type injection structure 8. Since the multi-level H-type injection structure 8 is arranged on the inner wall of the liquid feeding box 1, a plurality of surrounding feeding points are formed in the resin tank 4, and each feeding point is evenly distributed at different heights and positions of the resin tank 4. Its multi-point feeding method effectively avoids local oversaturation or deficiency of the resin liquid, ensuring that each feeding point can obtain an appropriate amount of resin liquid, thereby improving the stability of the printing process and the quality of the finished product. During the light curing process, the light source irradiates the photosensitive resin liquid in the resin tank 4 to cause a curing reaction. Due to the uniform distribution of the resin liquid in the tank, each feeding point can be fully illuminated to achieve a uniform curing effect, ensuring the bonding effect of each layer of resin liquid, thereby avoiding printing defects caused by poor interlayer bonding.

[0022] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0023] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

Claims

1. A feeding mechanism for a 3D printing device, characterized in that: include: A liquid adding box (1), wherein a C-port partition cover (2) is integrally formed on the inner wall of one side of the liquid adding box (1), the C-port partition cover (2) divides the interior of the liquid adding box (1) into a cavity (3) and a resin tank (4), the resin tank (4) being used to accommodate photosensitive resin, a bottom plate (601) being fixed inside the cavity (3), and a liquid storage box (6) being installed on the top of the bottom plate (601), a multi-level H-type liquid injection structure (8) for forming a plurality of feeding points at different heights being installed on the inner wall of the liquid adding box (1), a pump liquid feeding unit (7) interconnected with the feeding end of the multi-level H-type liquid injection structure (8) being installed on the inner wall of one side of the liquid adding box (1), and a pipeline liquid guide structure interconnected with the feeding end of the pump liquid feeding unit (7) being installed on one side of the bottom end of the liquid storage box (6); A pulley liquid mixing module (13) is installed inside the liquid storage box (6) and is used to keep the photosensitive resin inside the liquid storage box (6) in an active state. A central controller (5) is installed on the inner wall of one side of the C-port partition cover (2). The output end of the central controller (5) is electrically connected to the pump liquid feeding unit (7) and the input end of the pulley liquid mixing module (13).

2. The feeding mechanism of a 3D printing device according to claim 1, characterized in that: A liquid injection nozzle (10) which is in communication with the liquid storage box (6) is installed on one side of the top of the liquid storage box (6), and an electric heating rod (9) is installed on the top of the liquid storage box (6), wherein the input end of the electric heating rod (9) is electrically connected to the output end of the central controller (5).

3. The feeding mechanism of a 3D printing device according to claim 1, characterized in that: The bottom end of the liquid adding box (1) is integrally formed with a linear sealing cover (101), the interior of the linear sealing cover (101) is provided with a rectangular cavity which is isolated from the resin tank (4), the interior of the rectangular cavity is provided with a second electric heating rod (102), and the input end of the second electric heating rod (102) is electrically connected to the output end of the central controller (5).

4. The feeding mechanism of a 3D printing device according to claim 1, characterized in that: The pump liquid adding unit (7) comprises a gear delivery pump (701) mounted on an inner wall of one side of the liquid adding box (1), a U-shaped tube (702) mounted at the output port of the gear delivery pump (701), and an electromagnetic switch valve (703) mounted at one end of the surface of the U-shaped tube (702).

5. The feeding mechanism of a 3D printing device according to claim 4, characterized in that: The multi-level H-shaped liquid injection structure (8) comprises a plurality of H-shaped square-mouth profile tube groups (801) installed at equal intervals on the inner wall of the liquid adding box (1) and a vertical tube (802) installed between two adjacent H-shaped square-mouth profile tube groups (801), wherein the vertical tube (802) is used to keep the two adjacent H-shaped square-mouth profile tube groups (801) in a liquid conduction state, and a plurality of liquid outlet holes (803) are provided on the inner walls around the H-shaped square-mouth profile tube groups (801), and one end of the U-shaped tube (702) extends to the interior of one of the H-shaped square-mouth profile tube groups (801).

6. The feeding mechanism of a 3D printing device according to claim 5, characterized in that: The H-shaped square-mouth profile tube group (801) is composed of a front profile tube (8011), a rear profile tube (8012) and a longitudinal profile tube (8013); the front profile tube (8011) and the rear profile tube (8012) are installed in parallel on the front and rear inner walls of the liquid adding box (1); the longitudinal profile tube (8013) is installed between the front profile tube (8011) and the rear profile tube (8012) to ensure that the front profile tube (8011) and the rear profile tube (8012) are in a liquid conduction state.

7. The feeding mechanism of a 3D printing device according to claim 6, characterized in that: The pipeline liquid guiding structure comprises an S-shaped liquid outlet pipe (11) installed at the bottom end of the liquid storage box (6) and a right-angle liquid lifting pipe (12) installed at one side of the top end of the S-shaped liquid outlet pipe (11); one end of the right-angle liquid lifting pipe (12) away from the S-shaped liquid outlet pipe (11) is connected to the inlet of the gear delivery pump (701); the S-shaped liquid outlet pipe (11), the right-angle liquid lifting pipe (12), the gear delivery pump (701), the U-shaped pipe (702) and one of the longitudinal profile pipes (8013) form a passage.

8. The feeding mechanism of a 3D printing device according to claim 6, characterized in that: The H-shaped square-mouth profile tube groups (801) are provided in three pieces in total, and a circular tube cavity for the photosensitive resin to flow is provided inside the H-shaped square-mouth profile tube groups (801).

9. The feeding mechanism of a 3D printing device according to claim 1, characterized in that: The pulley liquid mixing module (13) comprises a main stirring shaft (1301) rotatably mounted on one side of the bottom of the liquid storage box (6), a stepper motor (1303) mounted on an outer wall of one side of the liquid storage box (6), and a pulley reduction transmission structure (1304) mounted on the output end of the stepper motor (1303) for driving the main stirring shaft (1301) to rotate.

10. The feeding mechanism of a 3D printing device according to claim 9, characterized in that: A plurality of T-shaped mixing arms (1302) of different heights are mounted on the surface of the main stirring shaft (1301).

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