Liquid adding mechanism and 3D printer with same

Abstract

The utility model provides a liquid adding mechanism and a 3D printer with the liquid adding mechanism, and the liquid adding mechanism comprises a liquid adding box which is provided with an inner cavity, and a liquid inlet and a liquid outlet which are communicated with the inner cavity; one end of the liquid inlet pump communicates with the liquid inlet, the other end of the liquid inlet pump communicates with the material supply container, and the liquid inlet pump is used for conveying the printing material from the material supply container into the liquid adding box; one end of the liquid outlet pump communicates with the liquid outlet, the other end of the liquid outlet pump communicates with a material disc of the 3D printer, and the liquid outlet pump is used for conveying the printing material in the liquid adding box into the material disc of the 3D printer; and the controller is in communication connection with the liquid inlet pump and the liquid outlet pump, and the controller is used for controlling starting or stopping of the liquid inlet pump and the liquid outlet pump. Through the technical scheme provided by the invention, the problem that a 3D printer in the related technology cannot meet the continuous operation requirement can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a liquid adding mechanism and a 3D printer having the same. Background Art

[0002] 3D printing technology is to manufacture three-dimensional entities by layering through a 3D printer based on the three-dimensional model data of the object. 3D printing technology can overcome special structural obstacles that cannot be achieved by traditional mechanical processing and realize the simplified production of any complex structural parts. Current 3D printing technologies include laser stereolithography (SLA), digital light processing (DLP), liquid crystal display technology (LCD), fused deposition modeling (FDM), selective laser sintering (SLS), etc.

[0003] Among them, the light-curing 3D printer uses a light source to project light onto the material tray, so that the light-curing material between the molding platform and the bottom of the material tray undergoes a polymerization reaction to obtain a cured sheet, which is bonded to the molding platform. By moving the molding platform away from the material tray and projecting the light source into the material tray intermittently or uninterruptedly, the cured sheets are cured layer by layer, and the stacked cured sheets finally form a three-dimensional solid print. In order to ensure the continuous operation of the printer, the light-curing material needs to be replenished.

[0004] In the prior art, liquid is usually added directly to the material tray of the 3D printer from a light-curing material supply mechanism. The liquid addition operation is inconvenient, and the replacement of the material supply mechanism is also troublesome, which is not conducive to the continuous operation of the 3D printer. Utility Model Content

[0005] The utility model provides a liquid adding mechanism and a 3D printer having the same, so as to solve the problem that the 3D printer in the related art cannot meet the continuous operation requirement.

[0006] According to one aspect of the utility model, a liquid adding mechanism is provided for a 3D printer, the liquid adding mechanism comprising: a liquid adding box having an inner cavity and a liquid inlet and a liquid outlet connected to the inner cavity; a liquid inlet pump, one end of the liquid inlet pump being connected to the liquid inlet, the other end of the liquid inlet pump being connected to a material supply container, the liquid inlet pump being used to transport printing materials from the material supply container to the liquid adding box; a liquid outlet pump, one end of the liquid outlet pump being connected to the liquid outlet, the other end of the liquid outlet pump being connected to a material tray of a 3D printer, the liquid outlet pump being used to transport printing materials in the liquid adding box to the material tray of the 3D printer; a controller being communicatively connected to the liquid inlet pump and the liquid outlet pump, the controller being used to control the start or stop of the liquid inlet pump and the liquid outlet pump.

[0007] Furthermore, the liquid adding mechanism also includes a collecting tank, and an overflow port is provided on the side wall of the liquid adding box. The collecting tank is located at one side of the liquid adding box and is arranged corresponding to the overflow port.

[0008] Furthermore, the liquid adding mechanism also includes a base, the liquid adding box and the collecting tank are both arranged on the base, and an upwardly extending baffle is provided at the edge of the base, and the upper edge of the baffle is higher than the notch of the collecting tank.

[0009] Furthermore, a liquid leakage sensor for detecting liquid leakage is arranged in the collecting tank.

[0010] Furthermore, the liquid adding mechanism also includes a liquid level detection component which is in communication connection with the controller, the liquid level detection component is arranged on the liquid adding box, and the liquid level detection component is used to detect the liquid level of the inner cavity.

[0011] Further, the liquid level detection component includes a capacitive liquid level gauge, the liquid adding mechanism also includes a connecting tube arranged on the outer wall of the liquid adding box, the connecting tube is connected to the inner cavity, the capacitive liquid level gauge is arranged on the connecting tube, and can detect the highest liquid level of the connecting tube; and / or, the liquid level detection component includes an ultrasonic liquid level gauge, the liquid adding mechanism also includes a bracket arranged on the top wall of the liquid adding box, a detection opening is arranged on the top wall of the liquid adding box, the bracket has a detection channel connected to the detection opening, the ultrasonic liquid level gauge is arranged on the bracket, and the ultrasonic transmitting end of the ultrasonic liquid level gauge is arranged opposite to the detection channel.

[0012] Furthermore, a temperature regulating component and a temperature detecting element are arranged in the inner cavity, and the temperature detecting element is arranged at the liquid inlet or the liquid outlet; the temperature regulating component is communicatively connected with the controller, and the controller is used to control the working state of the temperature regulating component.

[0013] Furthermore, the temperature regulating component includes a temperature control plate and a plurality of heat sinks, the temperature control plate and the heat sinks are arranged in the liquid adding box, and the temperature control plate is used to heat or cool the liquid in the liquid adding box.

[0014] Furthermore, the liquid adding mechanism also includes a base, and the liquid adding box, the liquid inlet pump and the liquid outlet pump are all arranged on the base; and / or, the liquid inlet is arranged on the top wall of the liquid adding box, and the liquid outlet is arranged on the bottom wall of the liquid adding box.

[0015] According to another aspect of the utility model, a 3D printer is provided, comprising: a material supply container for storing printing materials; a machine body, on which a material supply container and a material tray are provided; a liquid adding mechanism, which is provided on the machine body, wherein the material supply container is connected to a liquid inlet of the liquid adding mechanism, and the material tray is connected to a liquid outlet of the liquid adding mechanism, and the liquid adding mechanism is the liquid adding mechanism provided above.

[0016] Furthermore, the supply container is located below the liquid adding box of the liquid adding mechanism.

[0017] The technical solution of the utility model is applied, and the liquid adding mechanism includes a liquid adding box, a liquid inlet pump, a liquid outlet pump and a controller. When in use, the liquid inlet pump is started by the controller, and the printing material in the material supply container is pumped into the liquid adding box by the liquid inlet pump, and the printing material is stored in the inner cavity of the liquid adding box, and then the liquid outlet pump is started by the controller to pump the printing material in the liquid adding box into the material tray of the 3D printer. Compared with the method of directly adding liquid to the material tray by the supply mechanism and replacing the supply mechanism, the continuous operation of the 3D printer is realized through the transfer of the liquid adding box, while avoiding the inconvenience caused by the liquid adding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 An exploded view of a liquid adding mechanism provided according to an embodiment of the utility model is shown;

[0020] Figure 2 A schematic structural diagram of a liquid adding box of a liquid adding mechanism provided according to an embodiment of the utility model is shown;

[0021] Figure 3 A cross-sectional view of a liquid adding box of a liquid adding mechanism provided according to an embodiment of the utility model is shown;

[0022] Figure 4 A schematic structural diagram of a temperature regulating assembly of a liquid adding mechanism provided according to an embodiment of the utility model is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Liquid adding box; 11. Inner cavity; 12. Liquid inlet; 13. Liquid outlet; 14. Temperature regulating component; 141. Temperature control board; 142. Heat sink; 15. Connecting pipe; 16. Bracket;

[0025] 20. Temperature detection parts;

[0026] 30. Controller;

[0027] 40. Liquid level detection component; 41. Capacitive liquid level meter; 42. Ultrasonic liquid level meter;

[0028] 50. Collection tank;

[0029] 60. base; 61. baffle;

[0030] 70. Liquid inlet pump;

[0031] 80. Liquid discharge pump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] like Figures 1 to 4 As shown, an embodiment of the utility model provides a liquid adding mechanism for a 3D printer, the liquid adding mechanism includes a liquid adding box 10, a liquid inlet pump 70, a liquid outlet pump 80, and a controller 30. The liquid adding box 10 has an inner cavity 11 and a liquid inlet 12 and a liquid outlet 13 connected to the inner cavity 11; one end of the liquid inlet pump 70 is connected to the liquid inlet 12, and the other end of the liquid inlet pump 70 is connected to the supply container, and the liquid inlet pump 70 is used to transport the printing material from the supply container to the liquid adding box 10; one end of the liquid outlet pump 80 is connected to the liquid outlet 13, and the other end of the liquid outlet pump 80 is connected to the material tray of the 3D printer, and the liquid outlet pump 80 is used to transport the printing material in the liquid adding box 10 to the material tray of the 3D printer; the controller 30 is communicatively connected to the liquid inlet pump 70 and the liquid outlet pump 80, and the controller 30 is used to control the start or stop of the liquid inlet pump 70 and the liquid outlet pump 80.

[0034] The technical solution of the utility model is applied, and the liquid adding mechanism includes a liquid adding box 10, a liquid inlet pump 70, a liquid outlet pump 80 and a controller 30. When in use, the liquid inlet pump 70 is started by the controller 30, and the printing material in the material supply container is pumped into the liquid adding box 10 by the liquid inlet pump 70, and the printing material is stored by the inner cavity 11 of the liquid adding box 10, and then the liquid outlet pump 80 is started by the controller 30 to pump the printing material in the liquid adding box 10 into the material tray of the 3D printer. Compared with the method of directly adding liquid to the material tray by the supply mechanism and replacing the supply mechanism, the continuous operation of the 3D printer is realized through the transfer of the liquid adding box 10, while avoiding the inconvenience caused by the liquid adding operation.

[0035] like Figure 1 As shown, the liquid adding mechanism further includes a liquid level detection member 40 which is in communication with the controller 30. The liquid level detection member 40 is disposed on the liquid adding box 10 and is used to detect the liquid level of the inner cavity 11. With the above arrangement, the liquid inlet and outlet in the liquid adding box 10 can be controlled so that the liquid amount in the liquid adding box 10 meets the requirements.

[0036] like Figure 3As shown, the liquid level detection member 40 includes a capacitance liquid level gauge 41, and the liquid adding mechanism also includes a connecting pipe 15 arranged on the outer wall of the liquid adding box 10, the connecting pipe 15 is connected to the inner cavity 11, and the capacitance liquid level gauge 41 is arranged on the connecting pipe 15 and can detect the highest liquid level of the connecting pipe 15. By using the capacitance liquid level gauge 41 to detect the highest liquid level of the liquid adding box 10, the maximum amount of liquid in the liquid adding box 10 can be controlled.

[0037] Specifically, when the liquid level in the connecting pipe reaches the capacitance liquid level gauge 41 , the dielectric constant of the sensor of the capacitance liquid level gauge 41 changes, and forms an electrical signal output, thereby displaying the liquid level in the connecting pipe 15 .

[0038] like Figure 3 As shown, the liquid level detection member 40 further includes an ultrasonic liquid level meter 42, and the liquid adding mechanism further includes a bracket 16 disposed on the top wall of the liquid adding box 10, a detection opening is disposed on the top wall of the liquid adding box 10, and the bracket 16 has a detection channel connected to the detection opening, and the ultrasonic liquid level meter 42 is disposed on the bracket 16, and the ultrasonic transmitting end of the ultrasonic liquid level meter 42 is disposed opposite to the detection channel. The ultrasonic liquid level meter 42 can be used to detect the liquid level in the liquid adding box 10 at any time, thereby controlling the liquid output of the liquid outlet 13.

[0039] Specifically, the ultrasonic level meter 42 uses the principle of ultrasonic reflection. The ultrasonic wave enters the liquid adding box 10 through the detection channel and the detection opening, and forms reflection after contacting the liquid surface, so as to measure the height of the liquid surface.

[0040] The inner cavity 11 is provided with a temperature regulating component 14 and a temperature detecting component 20, and the temperature detecting component 20 is arranged at the liquid inlet 12 or the liquid outlet 13; the temperature regulating component 14 is connected to the controller 30 for communication, and the controller 30 is used to control the working state of the temperature regulating component 14. When the resin liquid enters the inner cavity 11 of the liquid adding box 10 through the liquid inlet 12 of the liquid adding box 10, the temperature of the liquid can be detected by the temperature detecting component 20. When the temperature of the liquid does not meet the requirements, the controller 30 controls the temperature regulating component 14 to switch to the working state according to the detected liquid temperature, and controls the output power and heating time of the temperature regulating component 14, so that the temperature of the liquid in the liquid adding box 10 meets the requirements.

[0041] In this embodiment, the temperature detection member 20 is a temperature measuring probe disposed on the top wall of the liquid adding box 10. The temperature regulating assembly 14 is controlled by the controller 30, so that the resin in the liquid adding box 10 can be quickly and evenly heated to a target temperature of 20°C to 25°C.

[0042] like Figure 4As shown, the temperature adjustment component 14 includes a temperature control plate 141 and a plurality of heat sinks 142. The temperature control plate 141 and the heat sinks 142 are arranged in the liquid adding box 10. The temperature control plate 141 is used to heat or cool the liquid in the liquid adding box. The temperature adjustment component 14 with the above structure has the advantages of simple structure and easy arrangement.

[0043] The heat sink 142 extends along the length direction of the temperature control plate 141 , and a plurality of heat sinks 142 are arranged on the lower surface of the temperature control plate 141 at intervals along the width direction of the temperature control plate 141 .

[0044] Specifically, the temperature regulating component 14 has two functions of heating and cooling. At the same time, the heat sink 142 is used for heat conduction to accelerate the temperature increase or temperature decrease speed of the liquid.

[0045] like Figure 1 As shown, the liquid adding mechanism further includes a collecting tank 50. The side wall of the liquid adding box 10 has an overflow port. The collecting tank 50 is located on one side of the liquid adding box 10 and is arranged corresponding to the overflow port. The collecting tank 50 can collect the liquid overflowing from the overflow port to prevent the liquid from flowing arbitrarily and being inconvenient to clean.

[0046] In this embodiment, the collecting tank 50 has a handle to facilitate the operator to take and place and clean the liquid therein.

[0047] like Figure 1 As shown, the liquid adding mechanism further includes a base 60, and the liquid adding box 10 and the collecting tank 50 are both arranged on the base 60. The edge of the base 60 is provided with a baffle 61 extending upward, and the upper edge of the baffle 61 is higher than the notch of the collecting tank 50. The base 60 can be used to support the liquid adding box 10 and the collecting tank 50, and the baffle 61 can be used to block the liquid overflowing from the collecting tank 50 and overflowing to the base 60, so as to prevent the liquid from flowing arbitrarily and being inconvenient to clean.

[0048] In this embodiment, a groove is provided on the base 60, and the collecting tank 50 is placed in the groove.

[0049] A liquid leakage sensor for detecting liquid leakage is provided in the collecting tank 50. The liquid leakage sensor can detect the overflow of the liquid in the collecting tank 50 to remind the user of the liquid state of the collecting tank 50.

[0050] Specifically, the liquid leakage sensor may be a capacitive sensor, and the liquid collected in the collecting tank 50 is detected by utilizing the change of the electrical signal of the capacitive sensor.

[0051] In this embodiment, the base 60 includes a horizontal frame and a vertical frame, the vertical frame is connected to one side of the horizontal frame, the liquid inlet pump 70 and the liquid outlet pump 80 are both arranged on the vertical frame, the liquid adding box 10 and the collecting tank 50 are both arranged on the horizontal frame, the baffle 61 is arranged on the horizontal frame and extends along the circumference of the horizontal frame, and the two ends of the baffle 61 are respectively connected to the vertical frame. The above-mentioned base 60 has the advantages of simple structure and easy processing.

[0052] The liquid inlet 12 is disposed on the top wall of the liquid adding box 10 , thereby preventing siphoning and preventing the liquid from flowing out of the liquid inlet 12 .

[0053] Specifically, the liquid outlet 13 is disposed on the bottom wall of the liquid adding box 10 , which can prevent air from entering the liquid adding box 10 , thereby preventing bubbles from being generated and entering the material tray, thereby achieving a better printing effect.

[0054] Another embodiment of the present application provides a 3D printer, which includes a feed container, a body, and a liquid adding mechanism. The feed container is used to store printing materials; the body is provided with a feed container and a material tray; the liquid adding mechanism is provided on the body, the feed container is connected to the liquid inlet 12 of the liquid adding mechanism, and the material tray is connected to the liquid outlet 13 of the liquid adding mechanism, and the liquid adding mechanism is the liquid adding mechanism provided above. The above-mentioned 3D printer is adopted, and the controller 30 is used to start the liquid inlet pump 70, and the printing material in the feed container is pumped into the liquid adding box 10 through the liquid inlet pump 70, and the inner cavity 11 of the liquid adding box 10 is used to store the printing material, and then the controller 30 is used to start the liquid outlet pump 80, and the printing material in the liquid adding box 10 is pumped into the material tray of the 3D printer. Compared with the method of directly adding liquid to the material tray by the supply mechanism and replacing the supply mechanism, the continuous operation of the 3D printer is realized through the transfer of the liquid adding box 10, while avoiding the inconvenience caused by the liquid adding operation.

[0055] In this embodiment, the feed container is located below the liquid adding box 10 of the liquid adding mechanism. With the above arrangement, the siphon effect can be avoided to prevent the liquid from flowing out of the liquid inlet 12.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A liquid adding mechanism for a 3D printer, characterized in that: The liquid adding mechanism comprises: A liquid adding box (10) having an inner cavity (11) and a liquid inlet (12) and a liquid outlet (13) communicated with the inner cavity (11); a liquid inlet pump (70), one end of the liquid inlet pump (70) being in communication with the liquid inlet port (12), and the other end of the liquid inlet pump (70) being in communication with the material supply container, and the liquid inlet pump (70) being used to transport the printing material from the material supply container to the liquid adding box (10); a liquid outlet pump (80), one end of the liquid outlet pump (80) being in communication with the liquid outlet port (13), and the other end of the liquid outlet pump (80) being in communication with a material tray of a 3D printer, and the liquid outlet pump (80) being used to transport the printing material in the liquid adding box (10) to the material tray of the 3D printer; The controller (30) is in communication connection with the liquid inlet pump (70) and the liquid outlet pump (80), and the controller (30) is used to control the start or stop of the liquid inlet pump (70) and the liquid outlet pump (80).

2. The liquid adding mechanism according to claim 1, characterized in that: The liquid adding mechanism further comprises a collecting groove (50), a side wall of the liquid adding box (10) is provided with an overflow port, and the collecting groove (50) is located on one side of the liquid adding box (10) and is arranged corresponding to the overflow port.

3. The liquid adding mechanism according to claim 2, characterized in that: The liquid adding mechanism further comprises a base (60), the liquid adding box (10) and the collecting tank (50) are both arranged on the base (60), and an upwardly extending baffle (61) is provided at the edge of the base (60), and the upper edge of the baffle (61) is higher than the notch of the collecting tank (50).

4. The liquid adding mechanism according to claim 2, characterized in that: A liquid leakage sensor for detecting liquid leakage is arranged in the collecting tank (50).

5. The liquid adding mechanism according to claim 1, characterized in that: The liquid adding mechanism further comprises a liquid level detection component (40) which is communicatively connected to the controller (30); the liquid level detection component (40) is arranged on the liquid adding box (10); and the liquid level detection component (40) is used to detect the liquid level of the inner cavity (11).

6. The liquid adding mechanism according to claim 5, characterized in that: The liquid level detection member (40) comprises a capacitance liquid level gauge (41), the liquid adding mechanism further comprises a connecting pipe (15) arranged on the outer wall of the liquid adding box (10), the connecting pipe (15) is connected with the inner cavity (11), the capacitance liquid level gauge (41) is arranged on the connecting pipe (15) and can detect the highest liquid level of the connecting pipe (15); and / or, The liquid level detection component (40) comprises an ultrasonic liquid level meter (42), and the liquid adding mechanism further comprises a bracket (16) arranged on the top wall of the liquid adding box (10), a detection opening is arranged on the top wall of the liquid adding box (10), and the bracket (16) has a detection channel connected to the detection opening. The ultrasonic liquid level meter (42) is arranged on the bracket (16), and the ultrasonic transmitting end of the ultrasonic liquid level meter (42) is arranged opposite to the detection channel.

7. The liquid adding mechanism according to claim 1, characterized in that: A temperature regulating component (14) and a temperature detecting component (20) are arranged in the inner cavity (11); the temperature detecting component (20) is arranged at the liquid inlet (12) or the liquid outlet (13); the temperature regulating component (14) is communicatively connected with the controller (30); the controller (30) is used to control the working state of the temperature regulating component (14).

8. The liquid adding mechanism according to claim 7, characterized in that: The temperature adjustment component (14) comprises a temperature control plate (141) and a plurality of heat sinks (142); the temperature control plate (141) and the heat sinks (142) are arranged in the liquid adding box (10); the temperature control plate (141) is used to heat or cool the liquid in the liquid adding box.

9. The liquid adding mechanism according to claim 1, characterized in that: The liquid adding mechanism further comprises a base (60), and the liquid adding box (10), the liquid inlet pump (70) and the liquid outlet pump (80) are all arranged on the base (60); and / or, The liquid inlet (12) is arranged on the top wall of the liquid adding box (10), and the liquid outlet (13) is arranged on the bottom wall of the liquid adding box (10).

10. A 3D printer, characterized in that: The 3D printer comprises: A material supply container for storing printing materials; A machine body, wherein a material supply container and a material tray are arranged on the machine body; A liquid adding mechanism is arranged on the machine body, the feed container is connected to the liquid inlet (12) of the liquid adding mechanism, the material tray is connected to the liquid outlet (13) of the liquid adding mechanism, and the liquid adding mechanism is the liquid adding mechanism described in any one of claims 1 to 9.

11. The 3D printer according to claim 10, characterized in that: The material supply container is located below the liquid adding box (10) of the liquid adding mechanism.

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