3D Printer Feeding System

Abstract

The present invention discloses a feeding system for a 3D printer, which includes a liquid path system and a gas path system. The liquid path system includes a first intermediate cavity, a first material tank and a first nozzle. The first intermediate cavity is communicated with the first material tank through a first connecting pipe, and a tenth switching valve is provided on the first connecting pipe. The first intermediate cavity is communicated with the first nozzle through a second connecting pipe, and an eleventh switching valve is provided on the second connecting pipe. The gas path system includes a first pump, a first switching valve, a second reversing valve and a sixth switching valve. The air outlet of the first pump is communicated with the outside atmosphere through the first switching valve, the air outlet of the first pump is connected to the second input interface of the second reversing valve, the air inlet of the first pump is communicated with the outside atmosphere through the sixth switching valve, the air inlet of the first pump is connected to the first input interface of the second reversing valve, and the first output interface of the second reversing valve is communicated with the first intermediate cavity. During the wax liquid transportation process, the wax liquid does not flow through the first pump, so there is no need to heat the first pump, and the service life of the first pump is relatively long.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a feeding system for a 3D printer. Background Art

[0002] Fused deposition modeling technology is a mainstream technology in 3D printing technology. Its printing materials are generally thermoplastic materials, such as wax, ABS, nylon, etc. The material is heated and melted in the nozzle. The nozzle moves along the part cross-section contour and filling trajectory, and at the same time extrudes the melted material. The material quickly solidifies and condenses with the surrounding materials.

[0003] In existing 3D printers applying fused deposition modeling technology, such as wax-type 3D printers, since the wax liquid is easy to solidify, during the process of transporting the wax liquid or when restarting after shutdown, the flow pump needs to be heated, otherwise the solidified wax will block the flow pump, which will greatly shorten the service life of the flow pump and increase the maintenance cost.

[0004] In addition, during the printing process of a wax-type 3D printer, there will be a phenomenon that the remaining material in the printing nozzle accidentally drips due to gravity when not under jet control. This can easily print out incorrect part structures or support structures, seriously affecting product quality. Therefore, Patent CN209096029U proposes an additive manufacturing device and its system, which can control the positive and negative pressure states of the printing nozzle by setting a vacuum pressure device. When in the negative pressure state, it can prevent the printing material from accidentally dripping. However, in addition to the feeding pump for replenishing materials to the printing nozzle, this additive manufacturing device also needs to set a vacuum pressure device, with a complex structure and high manufacturing cost. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention proposes a feeding system for a 3D printer.

[0006] The 3D printer feeding system according to an embodiment of the present invention includes: a liquid path system, including a first intermediate chamber, a first material tank, and a first nozzle. The first intermediate chamber is communicated with the first material tank through a first connecting pipe, and a tenth switching valve is provided on the first connecting pipe. The first intermediate chamber is communicated with the first nozzle through a second connecting pipe, and an eleventh switching valve is provided on the second connecting pipe; a gas path system, including a first pump, a first switching valve, a second reversing valve, and a sixth switching valve. The second reversing valve has a first input interface, a second input interface, and a first output interface. The second reversing valve has a first working position and a second working position. When the second reversing valve is in the first working position, the first input interface is communicated with the first output interface. When the second reversing valve is in the second working position, the second input interface is communicated with the first output interface; the air outlet of the first pump is connected to one end of the first switching valve, the other end of the first switching valve is communicated with the outside atmosphere, the air outlet of the first pump is connected to the second input interface of the second reversing valve, the air inlet of the first pump is connected to one end of the sixth switching valve, the other end of the sixth switching valve is communicated with the outside atmosphere, the air inlet of the first pump is connected to the first input interface of the second reversing valve, and the first output interface of the second reversing valve is communicated with the first intermediate chamber.

[0007] The 3D printer feeding system according to an embodiment of the present invention has at least the following technical effects: When it is necessary to transport the wax liquid to the first nozzle, first close the eleventh switching valve and the sixth switching valve, open the tenth switching valve and the first switching valve, and adjust the second reversing valve to the first working position. At this time, the first intermediate chamber is communicated with the air inlet of the first pump. Start the first pump to make the first intermediate chamber in a negative pressure state, and the wax liquid in the first material tank is sucked into the first intermediate chamber; then close the tenth switching valve and the first switching valve, open the eleventh switching valve and the sixth switching valve, and adjust the second reversing valve to the second working position. At this time, the first intermediate chamber is communicated with the air outlet of the first pump, and the wax liquid in the first intermediate chamber is squeezed to the first nozzle to complete the transportation of the wax liquid; the wax liquid does not flow through the first pump during the transportation process, so there is no need to heat the first pump, the service life of the first pump is relatively long, and the maintenance cost is reduced.

[0008] According to some embodiments of the present invention, the air inlet of the first pump is connected to one end of the sixth switching valve, and the other end of the sixth switching valve is communicated with the outside atmosphere through an air filter.

[0009] According to some embodiments of the present invention, the air outlet of the first pump is connected to the second input interface of the second reversing valve through a seventh connecting pipe, and a third pressure stabilizing tank and a third pressure sensor are provided on the seventh connecting pipe.

[0010] According to some embodiments of the present invention, the gas path system further includes a seventh reversing valve and an eighth reversing valve. Both the seventh reversing valve and the eighth reversing valve have the same structure as the second reversing valve. An eighth reversing valve is provided between the air inlet of the first pump and the first input interface of the second reversing valve. The first output interface of the eighth reversing valve is connected to the air inlet of the first pump, and the first input interface of the eighth reversing valve is connected to the first input interface of the second reversing valve. The first output interface of the seventh reversing valve is communicated with the first nozzle, the first input interface of the seventh reversing valve is connected to the second input interface of the eighth reversing valve, and the second input interface of the seventh reversing valve is connected to the air outlet of the first pump.

[0011] According to some embodiments of the present invention, the first input interface of the seventh reversing valve and the second input interface of the eighth reversing valve are connected through a fifth connecting pipe, and a first pressure stabilizing tank and a first pressure sensor are provided on the fifth connecting pipe.

[0012] According to some embodiments of the present invention, a fifth switching valve is connected in series on the fifth connecting pipe, and both the first pressure stabilizing tank and the first pressure sensor are provided between the fifth switching valve and the seventh reversing valve; a second pressure stabilizing tank and a second pressure sensor are provided on the fifth connecting pipe, and both the second pressure stabilizing tank and the second pressure sensor are provided between the fifth switching valve and the eighth reversing valve.

[0013] According to some embodiments of the present invention, the gas path system further includes a third switching valve. One end of the third switching valve is communicated with the fifth connecting pipe, and the connection between the third switching valve and the fifth connecting pipe is provided between the fifth switching valve and the seventh reversing valve. The other end of the third switching valve is communicated with the outside atmosphere through an air filter.

[0014] According to some embodiments of the present invention, the liquid path system further includes a second intermediate cavity, a second material tank and a second nozzle. The second intermediate cavity is communicated with the second material tank through a third connecting pipe, and a twelfth switching valve is provided on the third connecting pipe. The second intermediate cavity is communicated with the second nozzle through a fourth connecting pipe, and a thirteenth switching valve is provided on the fourth connecting pipe; the gas path system further includes a fourth reversing valve. The fourth reversing valve has the same structure as the second reversing valve. The first input interface of the fourth reversing valve is connected to the air inlet of the first pump, the second input interface of the fourth reversing valve is connected to the air outlet of the first pump, and the first output interface of the fourth reversing valve is communicated with the second intermediate cavity; the first output interface of the seventh reversing valve is communicated with the second nozzle.

[0015] According to some embodiments of the present invention, the liquid path system further includes a second intermediate chamber, a second material tank, and a second spray head. The second intermediate chamber is communicated with the second material tank through a third connecting pipe, and a twelfth switching valve is provided on the third connecting pipe. The second intermediate chamber is communicated with the second spray head through a fourth connecting pipe, and a thirteenth switching valve is provided on the fourth connecting pipe. The gas path system further includes a fourth reversing valve, which has the same structure as the second reversing valve. The first input interface of the fourth reversing valve is connected to the air inlet of the first pump, the second input interface of the fourth reversing valve is connected to the air outlet of the first pump, and the first output interface of the fourth reversing valve is communicated with the second intermediate chamber.

[0016] According to some embodiments of the present invention, the gas path system further includes a ninth switching valve. The first intermediate chamber is communicated with the second intermediate chamber through a sixth connecting pipe. One end of the ninth switching valve is connected to the air outlet of the first pump, and the other end of the ninth switching valve is communicated with the sixth connecting pipe.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic diagram of the feeding system of a 3D printer according to an embodiment of the present invention.

[0020] Figure 2 is Figure 1 a schematic structural diagram of the second reversing valve in

[0021] Reference Numerals:

[0022] First switching valve 01, second reversing valve 02, first input interface 021, second input interface 022, first output interface 023, third switching valve 03, fourth reversing valve 04, fifth switching valve 05, sixth switching valve 06, seventh reversing valve 07, eighth reversing valve 08, ninth switching valve 09, tenth switching valve 10, eleventh switching valve 11, twelfth switching valve 12, thirteenth switching valve 13

[0023] First pump 100, first pressure stabilizing tank 21, first pressure sensor 211, second pressure stabilizing tank 22, second pressure sensor 221, third pressure stabilizing tank 23, third pressure sensor 231, air filter 24, first material tank 31, first intermediate chamber 32, first spray head 33, second material tank 41, second intermediate chamber 42, second spray head 43. Detailed Embodiments

[0024] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0025] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the recited number, and "above", "below", "within", etc. are understood as including the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0027] Next, refer to Figure 1 and Figure 2 to describe the 3D printer feeding system according to the embodiments of the present invention.

[0028] The 3D printer feeding system according to an embodiment of the present invention includes: a liquid path system, including a first intermediate cavity 32, a first material tank 31, and a first nozzle 33. The first intermediate cavity 32 is communicated with the first material tank 31 through a first connecting pipe. A tenth switching valve 10 is provided on the first connecting pipe. The first intermediate cavity 32 is communicated with the first nozzle 33 through a second connecting pipe. An eleventh switching valve 11 is provided on the second connecting pipe; a gas path system, including a first pump 100, a first switching valve 01, a second reversing valve 02, and a sixth switching valve 06. The second reversing valve 02 has a first input interface 021, a second input interface 022, and a first output interface 023. The second reversing valve 02 has a first working position and a second working position. When the second reversing valve 02 is in the first working position, the first input interface 021 is communicated with the first output interface 023. When the second reversing valve 02 is in the second working position, the second input interface 022 is communicated with the first output interface 023; the air outlet of the first pump 100 is connected to one end of the first switching valve 01. The other end of the first switching valve 01 is communicated with the outside atmosphere. The air outlet of the first pump 100 is connected to the second input interface of the second reversing valve 02. The air inlet of the first pump 100 is connected to one end of the sixth switching valve 06. The other end of the sixth switching valve 06 is communicated with the outside atmosphere. The air inlet of the first pump 100 is connected to the first input interface of the second reversing valve 02. The first output interface of the second reversing valve 02 is communicated with the first intermediate cavity 32.

[0029] Wherein, the second reversing valve 02 can be a two-position three-way electromagnetic reversing valve; for lean management of parts and reducing the classification and storage pressure of parts, the first switching valve 01 and the sixth switching valve 06 can also be two-position three-way electromagnetic reversing valves. Taking the first switching valve 01 as an example, the first switching valve 01 has a first output interface, a first input interface, and a second input interface. The first input interface of the first switching valve 01 is connected to the air outlet of the first pump 100. The first output interface and the second input interface of the first switching valve 01 are both communicated with the outside atmosphere; the first pump 100 can be a diaphragm pump; the first nozzle 33 can be a conventional 3D printing nozzle, that is, a cavity capable of storing part of the wax liquid is provided in the first nozzle 33, and a piezoelectric nozzle is provided at the bottom of the cavity; in order to enable the wax liquid in the first material tank 31 to flow smoothly into the first intermediate cavity 32, the top of the first material tank 31 is communicated with the outside atmosphere, and the bottom of the first material tank 31 is communicated with the top of the first intermediate cavity 32. In order to enable the wax liquid in the first intermediate cavity 32 to flow smoothly into the cavity of the first nozzle 33, the top of the first intermediate cavity 32 is communicated with the top of the cavity.

[0030] When it is necessary to convey the wax liquid to the first nozzle 33, first close the eleventh switching valve 11 and the sixth switching valve 06, open the eleventh switching valve 11 and the first switching valve 01, and adjust the second reversing valve 02 to the first working position. At this time, the first intermediate cavity 32 is communicated with the air inlet of the first pump 100. Start the first pump 100 to make the first intermediate cavity 32 in a negative pressure state, and the wax liquid in the first material tank 31 is sucked into the first intermediate cavity 32. Then close the eleventh switching valve 11 and the first switching valve 01, open the eleventh switching valve 11 and the sixth switching valve 06, and adjust the second reversing valve 02 to the second working position. At this time, the first intermediate cavity 32 is communicated with the air outlet of the first pump 100, and the wax liquid in the first rod is squeezed to the first nozzle 33 to complete the conveyance of the wax liquid. During the conveyance of the wax liquid, it does not flow through the first pump 100, so there is no need to heat the first pump 100. The service life of the first pump 100 is relatively long, reducing the maintenance cost.

[0031] In some embodiments of the present invention, the air inlet of the first pump 100 is connected to one end of the sixth switching valve 06, and the other end of the sixth switching valve 06 is communicated with the outside atmosphere through an air filter 24. When the sixth switching valve 06 is opened, the outside air can reach the first pump 100 through the sixth switching valve 06. The air filter 24 is provided to prevent dust, debris and other sundries from entering the air circuit system.

[0032] In some embodiments of the present invention, the air outlet of the first pump 100 is connected to the second input interface of the second reversing valve 02 through a seventh connecting pipe. A third pressure stabilizing tank 23 and a third pressure sensor 231 are provided on the seventh connecting pipe. In this way, the positive pressure conveyance of the air outlet of the first pump 100 to the air circuit system is more stable. The third pressure sensor 231 is a positive pressure sensor and can detect the value of the positive pressure output by the first pump 100.

[0033] In some embodiments of the present invention, the gas path system further includes a seventh reversing valve 07 and an eighth reversing valve 08. Both the seventh reversing valve 07 and the eighth reversing valve 08 have the same structure as the second reversing valve 02. An eighth reversing valve 08 is provided between the air inlet of the first pump 100 and the first input interface of the second reversing valve 02. The first output interface of the eighth reversing valve 08 is connected to the air inlet of the first pump 100, the first input interface of the eighth reversing valve 08 is connected to the first input interface of the second reversing valve 02, the first output interface of the seventh reversing valve 07 is communicated with the first nozzle 33, the first input interface of the seventh reversing valve 07 is connected to the second input interface of the eighth reversing valve 08, and the second input interface of the seventh reversing valve 07 is connected to the air outlet of the first pump 100. In this way, the negative pressure generated at the air inlet of the first pump 100 can be conveyed to the first nozzle 33 to prevent the printing material from accidentally falling. Moreover, there is no need to additionally set up a vacuum and pressure device. Using one first pump 100 can complete the conveyance of the printing material and prevent the printing material from accidentally falling. At the same time, the positive pressure generated at the air outlet of the first pump 100 can also be conveyed to the first nozzle 33 to flush the first nozzle 33 and clean the first nozzle 33. The specific operation method is as follows: when it is necessary to convey wax liquid to the first nozzle 33, the seventh reversing valve 07 is adjusted to the first working position, no positive pressure will be formed in the first nozzle 33, the wax liquid in the first intermediate chamber 32 can flow to the first nozzle 33, the eighth reversing valve 08 is adjusted to the first working position, and a negative pressure can be formed at the first input interface of the second reversing valve 02. On this basis, by adjusting the working position of the second reversing valve 02, a positive pressure or a negative pressure can be formed in the first intermediate chamber 32 to complete the conveyance of the wax liquid; when it is necessary to form a positive pressure in the first nozzle 33, the seventh reversing valve 07 is adjusted to the second working position; when it is necessary to form a negative pressure in the first nozzle 33, the seventh reversing valve 07 is adjusted to the first working position, and the eighth reversing valve 08 is adjusted to the second working position. Among them, the seventh reversing valve 07 and the eighth reversing valve 08 can be two-position three-way electromagnetic reversing valves.

[0034] In some embodiments of the present invention, the first input interface of the seventh reversing valve 07 and the second input interface of the eighth reversing valve 08 are connected through a fifth connecting pipe. A first pressure stabilizing tank 21 and a first pressure sensor 211 are provided on the fifth connecting pipe. The negative pressure at the first nozzle 33 is supplied by the first pump 100 through the fifth connecting pipe. By setting the first pressure stabilizing tank 21, the negative pressure at the fifth connecting pipe is relatively stable, and further the negative pressure at the first nozzle 33 is relatively stable. The first pressure sensor 211 is a negative pressure sensor and can detect the value of the negative pressure at the nozzle.

[0035] In some embodiments of the present invention, a fifth switching valve 05 is connected in series on the fifth connecting pipe. The first pressure stabilizing tank 21 and the first pressure sensor 211 are both arranged between the fifth switching valve 05 and the seventh reversing valve 07. A second pressure stabilizing tank 22 and a second pressure sensor 221 are arranged on the fifth connecting pipe. The second pressure stabilizing tank 22 and the second pressure sensor 221 are both arranged between the fifth switching valve 05 and the eighth reversing valve 08. When the eighth reversing valve 08 is adjusted to the second working position and the fifth switching valve 05 is closed, the second pressure stabilizing tank 22 and the second pressure sensor 221 are communicated with the air inlet of the first pump 100. The second pressure sensor 221 is a negative pressure sensor and can detect the value of the negative pressure generated by the first pump 100. The fifth switching valve 05 can also be a two-position three-way electromagnetic reversing valve. The fifth switching valve 05 has a first output interface, a first input interface and a second input interface. The first input interface of the fifth switching valve 05 is closed. The first output interface of the fifth switching valve 05 is connected to the second input interface of the eighth reversing valve 08, and the second input interface of the fifth switching valve 05 is connected to the first input interface of the seventh reversing valve 07.

[0036] In some embodiments of the present invention, the gas circuit system further includes a third switching valve 03. One end of the third switching valve 03 is communicated with the fifth connecting pipe. The connection between the third switching valve 03 and the fifth connecting pipe is arranged between the fifth switching valve 05 and the seventh reversing valve 07. The other end of the third switching valve 03 is communicated with the outside atmosphere through an air filter 24. If the negative pressure at the first nozzle 33 is too large, resulting in the first nozzle 33 not working properly, at this time, the fifth switching valve 05 can be closed, and then the opening and closing of the third switching valve 03 can be adjusted to adjust the degree of negative pressure of the first pressure stabilizing tank 21, so that the negative pressure at the first nozzle 33 reaches a suitable range without affecting other parts of the gas circuit system, and the adjustment is completed. Among them, the air filter 24 connected to the third switching valve 03 and the air filter 24 connected to the sixth switching valve 06 can be the same one or two independent ones. In addition, similar to the above-mentioned first switching valve 01, the third switching valve 03 can also be a two-position three-way electromagnetic reversing valve.

[0037] In some embodiments of the present invention, the liquid path system further includes a second intermediate chamber 42, a second material tank 41, and a second nozzle 43. The second intermediate chamber 42 is communicated with the second material tank 41 through a third connecting pipe, and a twelfth switching valve 12 is provided on the third connecting pipe. The second intermediate chamber 42 is communicated with the second nozzle 43 through a fourth connecting pipe, and a thirteenth switching valve 13 is provided on the fourth connecting pipe. The gas path system further includes a fourth reversing valve 04, which has the same structure as the second reversing valve 02. The first input interface of the fourth reversing valve 04 is connected to the air inlet of the first pump 100, the second input interface of the fourth reversing valve 04 is connected to the air outlet of the first pump 100, and the first output interface of the fourth reversing valve 04 is communicated with the second intermediate chamber 42. A wax-type 3D printer generally has two printing nozzles for printing a target part and a support respectively, and different waxes are used. In the present invention, only one first pump 100 can be used to supply materials to the two printing nozzles separately. In addition, the first output interface of the seventh reversing valve 07 can be set to be communicated with the second nozzle 43, and a negative pressure can also be formed in the second nozzle 43.

[0038] In some embodiments of the present invention, the gas path system further includes a ninth switching valve 09. The first intermediate chamber 32 is communicated with the second intermediate chamber 42 through a sixth connecting pipe. One end of the ninth switching valve 09 is connected to the air outlet of the first pump 100, and the other end of the ninth switching valve 09 is communicated with the sixth connecting pipe. When it is necessary to supply materials to the first nozzle 33 and the second nozzle 43 simultaneously, the ninth switching valve 09 can be opened. Similarly to the above-mentioned fifth switching valve 05, the ninth switching valve 09 can also be a two-position three-way electromagnetic reversing valve.

[0039] The following refers to Figure 1 and Figure 2 describe the feeding system of a 3D printer according to specific embodiments of the present invention.

[0040] A tenth switching valve 10, a first intermediate chamber 32, and an eleventh switching valve 11 are sequentially connected in series between the first material tank 31 and the first nozzle 33. The first intermediate chamber 32 is additionally provided with an interface connected to the second reversing valve 02 and an interface connected to the sixth connecting pipe. The first nozzle 33 is additionally provided with an interface connected to the seventh reversing valve 07. A twelfth switching valve 12, a second intermediate chamber 42, and a thirteenth switching valve 13 are sequentially connected in series between the second material tank 41 and the second nozzle 43. The second intermediate chamber 42 is additionally provided with an interface connected to the fourth reversing valve 04 and an interface connected to the sixth connecting pipe. The second nozzle 43 is additionally provided with an interface connected to the seventh reversing valve 07.

[0041] The gas path connected to the air outlet of the first pump 100 is called the positive pressure gas path. The end of the positive pressure gas path is the sixth connecting pipe. Between the air outlet of the first pump 100 and the sixth connecting pipe, a third pressure stabilizing tank 23 and a ninth switching valve 09 are connected in series in sequence. A third pressure sensor 231 detects the air pressure in the third pressure stabilizing tank 23. One end of the first switching valve 01 is connected to a bypass of the positive pressure gas path. The bypass is located between the air outlet of the first pump 100 and the third pressure stabilizing tank 23. The other end of the first switching valve 01 communicates with the outside atmosphere. The second input interface of the second switching valve 02 and the second input interface of the fourth switching valve 04 are connected to another bypass of the positive pressure gas path. The bypass is located between the third pressure stabilizing tank 23 and the ninth switching valve 09. The second input interface of the seventh switching valve 07 is connected to yet another bypass of the positive pressure gas path. The bypass is located between the third pressure stabilizing tank 23 and the ninth switching valve 09; The gas path connected to the air inlet of the first pump 100 is called the negative pressure gas path. One end of a sixth switching valve 06 and the first output interface of an eighth switching valve 08 are connected to the negative pressure gas path. The other end of the sixth switching valve 06 communicates with the outside atmosphere through an air filter 24. The first input interface of the eighth switching valve 08 is simultaneously connected to the first input interface of the second switching valve 02 and the first input interface of the fourth switching valve 04. The second input interface of the eighth switching valve 08 is connected to the first input interface of the seventh switching valve 07 through a fifth connecting pipe. Between the second input interface of the eighth switching valve 08 and the first input interface of the seventh switching valve 07, a second pressure stabilizing tank 22 and a fifth switching valve 05 are connected in series in sequence. A second pressure sensor 221 detects the negative pressure of the second pressure stabilizing tank 22. There are two bypasses on the fifth connecting pipe. One bypass communicates with the outside atmosphere through a third switching valve 03, and the other bypass is connected to a first pressure stabilizing tank 21. A first pressure sensor 211 detects the negative pressure of the first pressure stabilizing tank 21; The first output interface of the seventh switching valve 07 is connected to a first nozzle 33 and a second nozzle 43. The first output interface of the second switching valve 02 is connected to a first intermediate cavity 32. The first output interface of the fourth switching valve 04 is connected to a second intermediate cavity 42.

[0042] When the seventh reversing valve 07 is adjusted to the first working position, negative pressure is formed at the first nozzle 33 and the second nozzle 43, which can prevent the printing material from dripping accidentally. When the seventh reversing valve 07 is adjusted to the second working position, positive pressure is formed at the first nozzle 33 and the second nozzle 43, flushing the first nozzle 33 and the second nozzle 43 to clean the first nozzle 33 and the second nozzle 43; when the second reversing valve 02 is adjusted to the first working position, negative pressure is formed in the first intermediate cavity 32, which can suck the wax liquid in the first material tank 31 into the first intermediate cavity 32. When the second reversing valve 02 is adjusted to the second working position, positive pressure is formed in the first intermediate cavity 32, which can transport the wax liquid in the first intermediate cavity 32 to the first nozzle 33; when the fourth reversing valve 04 is adjusted to the first working position, negative pressure is formed in the second intermediate cavity 42, which can suck the wax liquid in the second material tank 41 into the second intermediate cavity 42. When the fourth reversing valve 04 is adjusted to the second working position, positive pressure is formed in the second intermediate cavity 42, which can transport the wax liquid in the second intermediate cavity 42 to the second nozzle 43.

[0043] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A 3D printer feeding system, characterized in that, it includes: A liquid path system, including a first intermediate cavity, a first material tank and a first nozzle. The first intermediate cavity is communicated with the first material tank through a first connecting pipe. A tenth switching valve is arranged on the first connecting pipe. The first intermediate cavity is communicated with the first nozzle through a second connecting pipe. An eleventh switching valve is arranged on the second connecting pipe; A gas path system, including a first pump, a first switching valve, a second reversing valve and a sixth switching valve. The second reversing valve has a first input interface, a second input interface and a first output interface. The second reversing valve has a first working position and a second working position. When the second reversing valve is in the first working position, the first input interface is communicated with the first output interface. When the second reversing valve is in the second working position, the second input interface is communicated with the first output interface; The air outlet of the first pump is connected to one end of the first switching valve, the other end of the first switching valve is communicated with the outside atmosphere, the air outlet of the first pump is connected to the second input interface of the second reversing valve, the air inlet of the first pump is connected to one end of the sixth switching valve, the other end of the sixth switching valve is communicated with the outside atmosphere, the air inlet of the first pump is connected to the first input interface of the second reversing valve, and the first output interface of the second reversing valve is communicated with the first intermediate cavity; The air inlet of the first pump is connected to one end of the sixth switching valve, and the other end of the sixth switching valve is communicated with the outside atmosphere through an air filter; The air outlet of the first pump is connected to the second input interface of the second reversing valve through a seventh connecting pipe. A third pressure stabilizing tank and a third pressure sensor are arranged on the seventh connecting pipe.

2. The 3D printer feeding system according to claim 1, characterized in that: The gas path system further includes a seventh reversing valve and an eighth reversing valve. The seventh reversing valve and the eighth reversing valve have the same structure as the second reversing valve. An eighth reversing valve is arranged between the air inlet of the first pump and the first input interface of the second reversing valve. The first output interface of the eighth reversing valve is connected to the air inlet of the first pump. The first input interface of the eighth reversing valve is connected to the first input interface of the second reversing valve. The first output interface of the seventh reversing valve is communicated with the first nozzle. The first input interface of the seventh reversing valve is connected to the second input interface of the eighth reversing valve. The second input interface of the seventh reversing valve is connected to the air outlet of the first pump.

3. The 3D printer feeding system according to claim 2, characterized in that: The first input interface of the seventh reversing valve is connected to the second input interface of the eighth reversing valve through a fifth connecting pipe. A first pressure stabilizing tank and a first pressure sensor are arranged on the fifth connecting pipe.

4. The 3D printer feeding system according to claim 3, characterized in that: A fifth switching valve is connected in series on the fifth connecting pipe. The first pressure stabilizing tank and the first pressure sensor are both arranged between the fifth switching valve and the seventh reversing valve. A second pressure stabilizing tank and a second pressure sensor are arranged on the fifth connecting pipe, and the second pressure stabilizing tank and the second pressure sensor are both arranged between the fifth switching valve and the eighth reversing valve.

5. The 3D printer feeding system according to claim 4, characterized in that: The gas circuit system further includes a third switching valve. One end of the third switching valve is communicated with the fifth connecting pipe. The connection part of the third switching valve and the fifth connecting pipe is arranged between the fifth switching valve and the seventh reversing valve. The other end of the third switching valve is communicated with the outside atmosphere through an air filter.

6. The 3D printer feeding system according to claim 2, characterized in that: The liquid circuit system further includes a second intermediate cavity, a second material tank and a second nozzle. The second intermediate cavity and the second material tank are communicated through a third connecting pipe. A twelfth switching valve is arranged on the third connecting pipe. The second intermediate cavity and the second nozzle are communicated through a fourth connecting pipe. A thirteenth switching valve is arranged on the fourth connecting pipe. The gas circuit system further includes a fourth reversing valve. The fourth reversing valve has the same structure as the second reversing valve. The first input interface of the fourth reversing valve is connected to the air inlet of the first pump. The second input interface of the fourth reversing valve is connected to the air outlet of the first pump. The first output interface of the fourth reversing valve is communicated with the second intermediate cavity. The first output interface of the seventh reversing valve is communicated with the second nozzle.

7. The 3D printer feeding system according to any one of claims 1 to 5, characterized in that: The liquid circuit system further includes a second intermediate cavity, a second material tank and a second nozzle. The second intermediate cavity and the second material tank are communicated through a third connecting pipe. A twelfth switching valve is arranged on the third connecting pipe. The second intermediate cavity and the second nozzle are communicated through a fourth connecting pipe. A thirteenth switching valve is arranged on the fourth connecting pipe. The gas circuit system further includes a fourth reversing valve. The fourth reversing valve has the same structure as the second reversing valve. The first input interface of the fourth reversing valve is connected to the air inlet of the first pump. The second input interface of the fourth reversing valve is connected to the air outlet of the first pump. The first output interface of the fourth reversing valve is communicated with the second intermediate cavity.

8. The 3D printer feeding system according to claim 7, characterized in that: The gas circuit system further includes a ninth switching valve. The first intermediate cavity and the second intermediate cavity are communicated through a sixth connecting pipe. One end of the ninth switching valve is connected to the air outlet of the first pump. The other end of the ninth switching valve is communicated with the sixth connecting pipe.

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