Nozzle wax circulating device

Abstract

The application discloses a kind of nozzle wax liquid circulating device, comprising: printing nozzle, with ink cavity, the both ends of ink cavity are equipped with first inlet and first outlet;Main block, be equipped with primary wax cavity and secondary wax cavity, main block is equipped with return channel, one end of return channel is called connection end;Primary wax cavity is equipped with first channel for being connected to first inlet, secondary wax cavity is equipped with second channel for being connected to first outlet and third channel being communicated with return channel;Top cover, bottom surface is equipped with primary recess, secondary recess corresponding to primary wax cavity, secondary wax cavity, primary recess, secondary recess are equipped with negative pressure interface;Top cover is equipped with return pump, suction channel is connected between connection end and suction port, liquid discharge channel is connected between primary wax cavity and liquid discharge port.The connecting channel between return pump and primary wax cavity, secondary wax cavity is all arranged in main block and top cover, reduce the use of conduit, avoid the problem that conduit is staggered and confused to cause equipment manufacturing and overhaul difficult.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a wax liquid circulation device for a nozzle. Background Art

[0002] Wax-based 3D printers require a wax supply system to feed the printheads. Previous systems only provided a one-way supply of wax to the printheads, resulting in a relatively simple wax supply pipeline structure, using only conduits to connect the various interfaces. To overcome the limitations of this one-way supply, wax supply systems that provide a circulating supply of wax to the printheads have been developed. However, due to the complexity of wax supply systems, using only conduits to connect the various interfaces results in a chaotic and tangled system of conduits, making the equipment difficult to manufacture and maintain, and inconvenient to use. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a wax liquid circulation device for a nozzle.

[0004] The nozzle wax liquid circulation device according to an embodiment of the present invention includes:

[0005] A print head having an ink chamber, with nozzle interfaces at both ends of the ink chamber, the two nozzle interfaces being respectively provided with a first inlet and a first outlet;

[0006] The main block is provided with a primary wax cavity and a secondary wax cavity, the tops of the primary wax cavity and the secondary wax cavity are open, and a reflux channel is provided in the main block, one end of the reflux channel is called a connecting end, and the connecting end is provided on the top surface of the main block; the bottom of the primary wax cavity is provided with a first channel for connecting to a first inlet, and the bottom of the secondary wax cavity is provided with a second channel for connecting to a first outlet and a third channel connected to the reflux channel;

[0007] A top cover is provided on the top of the main block, and a first-level groove and a second-level groove are provided on the bottom surface of the top cover, which correspond to the first-level wax cavity and the second-level wax cavity one by one, and the groove walls of the first-level groove and the second-level groove are respectively provided with negative pressure interfaces; the top cover is provided with a reflux pump, and a suction channel and a discharge channel are provided in the top cover, the suction channel is connected between the connecting end and the suction port of the reflux pump, and the discharge channel is connected between the first-level wax cavity and the discharge port of the reflux pump.

[0008] The nozzle wax liquid circulation device according to the embodiment of the present invention has at least the following technical effects: when in use, negative pressure is supplied to the negative pressure interface of the first-level groove and the negative pressure interface of the second-level groove, and the negative pressure value of the first-level groove is made smaller than the negative pressure value of the second-level groove, so that the wax liquid can flow from the first-level wax chamber through the ink chamber to the second-level wax chamber, and the ink chamber can maintain negative pressure for the normal operation of the printing nozzle. At the same time, since a reflux pump is provided, the wax liquid in the second-level wax chamber can be transported back to the first-level wax chamber by the reflux pump, thereby realizing the circulating wax supply to the printing nozzle; by providing a main block and a top cover, the connecting channels between the reflux pump and the first-level wax chamber and the second-level wax chamber are all provided in the main block and the top cover, thereby reducing the use of conduits and avoiding the problem of difficulty in equipment manufacturing and maintenance caused by the interlaced and chaotic conduits.

[0009] According to some embodiments of the present invention, there are multiple print heads, and the secondary wax chamber, the first channel, the second channel, the third channel, and the secondary groove are collectively referred to as a circulation unit. There are multiple circulation units, and multiple print heads and multiple circulation units are connected one-to-one; for any of the circulation units, the third channel is provided with a shut-off valve.

[0010] According to some embodiments of the present invention, the plurality of secondary wax cavities are sequentially spaced apart in the transverse direction on the rear side of the primary wax cavity.

[0011] According to some embodiments of the present invention, the reflux channel has a transverse section and a vertical section, the connecting end is located at the top end of the vertical section, and the third channel is connected to the transverse section.

[0012] According to some embodiments of the present invention, the print head has two ink chambers, the main block and the top cover are collectively referred to as a circulation assembly, there are two circulation assemblies, and the two circulation assemblies are connected to the two ink chambers in a one-to-one correspondence.

[0013] According to some embodiments of the present invention, the main blocks of the two circulation assemblies are an integral component.

[0014] According to some embodiments of the present invention, the two circulation assemblies are respectively referred to as the first assembly and the second assembly, the two ink chambers are respectively referred to as the first chamber and the second chamber, all of the first channels and the second channels are vertically arranged middle through holes; the lower side of the main block is sequentially stacked with a first bottom plate and a second bottom plate;

[0015] The bottom surface of the main block or the top surface of the first bottom plate is provided with a plurality of first transition flow channels, the first bottom plate is provided with a plurality of first-first through holes, the plurality of first transition flow channels are connected one-to-one between the plurality of first-first through holes and the plurality of intermediate through holes of the first component, the second bottom plate is provided with a second-first through hole corresponding to each of the first-first through holes; the plurality of second-first through holes are connected one-to-one above the nozzle interfaces of all the first cavities;

[0016] A plurality of second transition flow channels are provided on the bottom surface of the first bottom plate or the top surface of the second bottom plate, and both ends of each of the second transition flow channels are respectively connected to the first through holes provided on the first bottom plate and the second through holes provided on the second bottom plate. The plurality of first through holes are connected one-to-one with the plurality of middle through holes of the second component, and the plurality of second through holes are connected one-to-one with the top of the nozzle interfaces of all the second cavities.

[0017] According to some embodiments of the present invention, the second-first through hole and the second-second through hole are both referred to as second through holes; the second through holes are connected to the nozzle interface via a vertically arranged connecting pipe.

[0018] According to some embodiments of the present invention, the liquid suction channel is provided with a one-way valve.

[0019] According to some embodiments of the present invention, a liquid inlet is provided on the wall of the primary wax chamber.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0022] Figure 1 2. It is a schematic diagram of the three-dimensional structure of the wax liquid circulation device for the nozzle according to an embodiment of the present invention;

[0023] Figure 2 is a schematic cross-sectional structural diagram of a main block in one embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the three-dimensional structure of the main block in one embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the three-dimensional structure of the top cover in one embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the three-dimensional structure of the first transition channel in one embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of the three-dimensional structure of the second transition channel in one embodiment of the present invention;

[0028] Figure 7 This is a system principle diagram of a wax liquid circulation device for a nozzle according to an embodiment of the present invention;

[0029] In the attached figure:

[0030] 010-print nozzle; 011-ink chamber; 020-heating component; 100-main block; 110-primary wax chamber; 120-secondary wax chamber; 121-third channel; 122-stop valve; 130-horizontal section; 140-vertical section; 141-connecting end; 180-liquid inlet; 190-liquid level sensor; 200-top cover; 210-reflux pump; 211-liquid suction port; 212-liquid discharge port; 213-suction port Liquid channel; 214-discharge channel; 220-one-way valve; 231-first groove; 232-negative pressure interface; 233-secondary groove; 300-first bottom plate; 400-second bottom plate; 510-first transition channel; 511-first channel; 512-second channel; 513-first through hole; 514-second through hole; 520-second transition channel; 523-first through hole; 524-second through hole. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the directions or positional relationships indicated, such as up, down, front, back, left, and right, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the meaning of "several" is one or more, the meaning of "more" is more than two, and the meanings of "greater than", "less than", and "exceed" are not inclusive of the number itself, while the meanings of "above", "below", and "within" are inclusive of the number itself. If there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Reference below Figures 1 to 7 The wax liquid circulation device for a nozzle according to an embodiment of the present invention is described.

[0035] The nozzle wax liquid circulation device of the embodiment of the present invention is as follows: Figure 1 As shown, it includes a print head 010 , a main block 100 and a top cover 200 .

[0036] The print head 010 has an ink chamber 011. Both ends of the ink chamber 011 are provided with nozzle interfaces. The two nozzle interfaces are respectively provided with a first inlet and a first outlet. A flow channel is formed in the ink chamber 011 with the first inlet as the beginning and the first outlet as the end. The wax liquid in the ink chamber 011 can be used for printing by the print head 010.

[0037] The main block 100 is provided with a first-level wax cavity 110 and a second-level wax cavity 120. Both the first-level wax cavity 110 and the second-level wax cavity 120 are recessed downward from the top surface of the main block. The tops of the first-level wax cavity 110 and the second-level wax cavity 120 are open. A reflux channel is provided in the main block 100. One end of the reflux channel is called a connecting end 141, and the connecting end 141 is provided on the top surface of the main block 100; a first channel 511 for connecting to the first inlet is provided at the bottom of the first-level wax cavity 110, and a second channel 512 for connecting to the first outlet and a third channel 121 connected to the reflux channel are provided at the bottom of the second-level wax cavity 120; the main block 100 is a metal material component, and a heating rod can be provided in the main block 100 to heat the main block 100, thereby achieving the purpose of heating the wax cavity in the main block 100 and the wax liquid in various channels.

[0038] The top cover 200 is placed on the top of the main block 100. Figure 4The bottom surface of the top cover 200 is provided with a first-level recess 231 and a second-level recess 233 corresponding to the first-level wax cavity 110 and the second-level wax cavity 120, respectively, the first-level recess 231 is arranged above the first-level wax cavity 110 and communicates with the first-level wax cavity 110, the second-level recess 233 is arranged above the second-level wax cavity 120 and communicates with the second-level wax cavity 120, the groove wall of the first-level recess 231 and the second-level recess 233 is respectively provided with a negative pressure interface 232, the negative pressure interface 232 can be arranged on the front side, the rear side, the left side or the right side of the top cover 200, so as to avoid being arranged on the top of the top cover 200, thereby preventing the arrangement of the backflow pump 210 from being hindered; the top cover 200 is provided with the backflow pump 210, the backflow pump 210 is arranged on the top of the top cover 200, the top cover 200 is provided with a liquid suction channel 213 and a liquid discharge channel 214, the liquid suction channel 213 is connected between the connecting end 141 and the liquid suction port 211 of the backflow pump 210, and the liquid discharge channel 214 is connected between the first-level wax cavity 110 and the liquid discharge port 212 of the backflow pump 210.

[0039] Referring to Figure 7 In use, negative pressure is supplied to the negative pressure interfaces of the first-level recess 231 and the second-level recess 233, and the negative pressure value of the first-level recess 231 is less than that of the second-level recess 233, so that the wax liquid flows from the first-level wax cavity 110 to the second-level wax cavity 120 through the ink cavity 011, and the ink cavity 011 can maintain negative pressure to enable the printing nozzle 010 to work normally, and meanwhile, due to the arrangement of the backflow pump 210, the wax liquid in the second-level wax cavity 120 can be transported back to the first-level wax cavity 110 by the backflow pump 210, thereby realizing the circulation of the printing nozzle 010; by arranging the main block 100 and the top cover 200, the connecting channels between the backflow pump 210 and the first-level wax cavity 110 and the second-level wax cavity 120 are arranged in the main block 100 and the top cover 200, thereby reducing the use of the conduit and avoiding the problem that the interlaced and disordered conduit leads to high difficulty in equipment manufacturing and maintenance.

[0040] In some embodiments of the present application, the number of printing nozzles 010 is multiple, the second-level wax cavity 120, the first channel 511, the second channel 512, the third channel 121 and the second-level recess 233 are collectively referred to as a circulation unit, the number of circulation units is multiple, and the multiple printing nozzles 010 and the multiple circulation units are connected one by one; for any circulation unit, the third channel 121 is provided with a stop valve 122. In the present embodiment, the number of printing nozzles 010 is three, the number of second-level wax cavities 120 is three, each second-level wax cavity 120 is provided with a second channel 512 and a third channel 121, and the number of first channels 511 is three, the three first channels 511 are connected to one first-level wax cavity 110. Of course, in some other embodiments of the present application, the number of printing nozzles 010 can also be two, four or more, and the number of circulation units is consistent with the number of printing nozzles 010.

[0041] By setting up multiple print heads 010, multiple print heads 010 can be set side by side during assembly to increase the printing width and improve printing efficiency; it should be noted that if the number of secondary wax chambers 120 is only one, the same as the primary wax chamber 110, and the first outlets of all print heads 010 are connected to one secondary wax chamber 120, all ink chambers 011 will be connected in parallel. The ink chamber 011 with greater flow resistance will have a smaller flow rate, and the smaller the flow rate, the easier it is to get blocked, which in turn increases the flow resistance, forming a vicious circle and easily leading to blockage failure. Moreover, even if the flow channel between one of the ink chambers 011 and the primary wax chamber 110, or the flow channel between the ink chamber 011 and the secondary wax chamber 120 is blocked, the corresponding print head 010 can still continue to operate, there will be no abnormality in a short time, and the blockage will not be easy to be discovered. In this embodiment, each print head 010 is equipped with an independent secondary wax chamber 120 and a stop valve 122. When in use, the stop valve 122 can be controlled to be turned on when the liquid level in the secondary wax chamber 120 reaches a preset height, otherwise the stop valve 122 can be controlled to be cut off; the blockage of the corresponding circulation channel can be judged by monitoring the ratio of the on time to the off time of the stop valve 122. The smaller the ratio of the on time to the off time, the more serious the blockage of the flow channel from the primary wax chamber 110 to the print head 010 and then to the secondary wax chamber 120, which facilitates timely detection of blockage faults and timely maintenance.

[0042] In some embodiments of the present invention, reference Figure 3 The plurality of secondary wax cavities 120 are sequentially arranged at intervals in the transverse direction on the rear side of the primary wax cavity 110. This makes full use of the space in the main block 100 and makes the structure compact.

[0043] In some embodiments of the present invention, the reflux channel has a transverse section 130 and a vertical section 140, the connection end 141 is located at the top of the vertical section 140, and the third channel 121 is connected to the transverse section 130. This facilitates providing a shutoff valve 122 for each third channel 121.

[0044] Reference Figure 2The depth of the secondary wax cavity 120 is less than the depth of the primary wax cavity 110, the transverse section 130 is arranged below the plurality of secondary wax cavities 120, the third channel 121 is arranged at the rear side of the transverse section 130, the stop valve 122 can be a plug-in electromagnetic valve, the stop valve 122 is arranged at the rear side of the main block 100, and the stop valves 122 of the plurality of circulation units are arranged in sequence in the transverse direction, so that the structure is compact and the replacement and maintenance of the stop valves 122 are facilitated; the primary wax cavity 110 and the secondary wax cavity 120 can be provided with liquid level sensors 190 to monitor the liquid level, the liquid level sensor of the primary wax cavity 110 is used to control the supplement of the wax liquid to the primary wax cavity 110, and the liquid level sensor of the secondary wax cavity 120 is used to control the corresponding stop valve 122, so as to facilitate the automatic control of the wax liquid circulation; wherein the liquid level sensor of the primary wax cavity 110 can be inserted into the primary wax cavity 110 from the front side of the main block 100, the liquid level sensor of the secondary wax cavity 120 can be inserted into the secondary wax cavity 120 from the rear side of the main block 100, the secondary wax cavities 120 of the plurality of circulation units are arranged in sequence in the transverse direction, the layout is reasonable, the valves, sensors and other components do not need to be arranged in the main block 100, and the disassembly, replacement and actual use are facilitated.

[0045] It can be understood that some wax type 3D printers need to print structural wax and support wax at the same time; therefore, in some embodiments of the present application, the printing nozzle 010 has two ink cavities 011, the main block 100 and the top cover 200 are collectively referred to as a circulation assembly, the number of circulation assemblies is two, and the two circulation assemblies are connected one by one with the two ink cavities 011. The two circulation assemblies are arranged in left-right mirror symmetry; in this way, the present application can also supply structural wax and support wax to the printing nozzle 010 at the same time.

[0046] In some embodiments of the present application, the main blocks 100 of the two circulation assemblies are integral components. In this way, it is convenient to set the same set of heating devices for heating, and at the same time, there is no gap between the bottoms of the two main blocks 100, so that the first bottom plate 300 and the second bottom plate 400 can be arranged to uniformly arrange the flow channels.

[0047] In some embodiments of the present invention, the two circulation components are respectively referred to as the first component and the second component, the two ink chambers 011 are respectively referred to as the first chamber and the second chamber, all the first channels 511 and the second channels 512 are middle through holes arranged vertically; the lower side of the main block 100 is sequentially stacked with the first bottom plate 300 and the second bottom plate 400, and the first bottom plate 300 can be provided with a heating rod for heating; sealing gaskets are provided between the top cover 200 and the main block 100, between the main block 100 and the first bottom plate 300, and between the first bottom plate 300 and the second bottom plate 400 to prevent the various cavities and passages from being blocked. In order to prevent the wax liquid in the channel from leaking, the first base plate 300 is installed on the main block 100 by a plurality of first bolts, and the first bolts pass through the first base plate 300 from bottom to top and are then threadedly connected to the main block 100. The second base plate 400 is installed on the main block 100 by a plurality of second bolts, and the second bolts pass through the second base plate 400 from bottom to top and are then threadedly connected to the first base plate 300. The second base plate 400 is provided with an avoidance hole corresponding to each first bolt, so that the disassembly and assembly of the main block 100 and the first base plate 300, and the disassembly and assembly of the first base plate 300 and the second base plate 400 can be carried out independently without affecting each other.

[0048] The bottom surface of the main block 100 or the top surface of the first bottom plate 300 is provided with a plurality of first transition channels 510. Taking the number of print heads 010 as three and the two ink chambers 011 provided in the print heads 010 as an example, the number of first transition channels 510 is six. The first bottom plate 300 is provided with a plurality of first through holes 513. The plurality of first transition channels 510 are connected one-to-one between the plurality of first through holes 513 and the plurality of intermediate through holes of the first component. The second bottom plate 400 is provided with a second through hole 514 corresponding to each first through hole 513. The first through hole 513 and the corresponding second through hole 514 are coaxial and connected; the plurality of second through holes 514 are connected one-to-one above the nozzle interfaces of all the first chambers; refer to Figure 5 The wax liquid in the first component can flow from the first wax chamber through the first channel, the first transition channel, the first through hole and the second through hole in sequence to the print head, or it can flow from the print head through another second through hole, another first through hole, another first transition channel and the second channel in sequence to the second wax chamber.

[0049] A plurality of second transition channels 520 are provided on the bottom surface of the first bottom plate 300 or the top surface of the second bottom plate 400. The number of the second transition channels 520 is six. The two ends of each second transition channel 520 are respectively connected to the first and second through holes 523 provided on the first bottom plate 300 and the second and second through holes 524 provided on the second bottom plate 400. The plurality of first and second through holes 523 are connected one-to-one with the plurality of middle through holes of the second component. The first and second through holes 523 and the corresponding middle through holes are coaxial and connected. The plurality of second and second through holes 524 are connected one-to-one with the top of the nozzle interface of all the second cavities; refer toFigure 6 The wax liquid in the second component can flow from the primary wax chamber through the first channel, the first and second through holes, the second transition channel and the second and second through holes in sequence to the print head, or it can flow from the print head through another second and second through hole, another second transition channel, another first and second through holes and the second channel in sequence to the second wax chamber.

[0050] The first transition channel 510, the first through hole 513 and the second through hole 514 are all used to support the circulation of one of the wax and the structural wax, and the second transition channel 520, the first through hole 523 and the second through hole 524 are all used to support the circulation of the other of the wax and the structural wax; by setting the first base plate 300 and the second base plate 400, there is no need to set too many conduits between the main block 100 and the printing nozzle 010. By removing the first base plate 300 and the second base plate 400, the first transition channel 510 and the second transition channel 520 can be exposed, which is convenient for inspection and cleaning, and also convenient for unified heating of each channel.

[0051] In some embodiments of the present invention, both second-first through hole 514 and second-second through hole 524 are referred to as second through holes; the second through holes are connected to the nozzle interface via vertically arranged connecting tubes. Each second through hole and the nozzle interface can be connected using a vertically arranged connecting tube, thus avoiding the problem of tangled and intertwined tubes. Furthermore, for each print head 010, its four connecting tubes can be wrapped with a single heating element 020 for heating, resulting in a simple structure, reduced tangled tubes, and easier installation of the print head 010.

[0052] In some embodiments of the present invention, the liquid suction channel 213 is provided with a one-way valve 220. This prevents the primary wax chamber 110 from releasing pressure into the secondary wax chamber 120 through the reflux channel in the event of a pressure differential, thereby facilitating the maintenance of a pressure differential between the primary wax chamber 110 and the secondary wax chamber 120. The one-way valve 220 is also a cartridge valve. The top of the top cover 200 is provided with a first mounting cavity for mounting the one-way valve 220. The top of the first mounting cavity is open. The liquid suction channel 213 extends upward from the connection end 141 to the first mounting cavity, then extends forward from the cavity wall of the first mounting cavity to the liquid suction port 211. The liquid discharge port 212 is provided below the liquid suction port 211, and the liquid discharge channel 214 extends downward from the liquid discharge port 212 to the first wax chamber. The one-way valve 220 includes a valve core disposed in the first mounting area. The valve core tends to move downward under the action of gravity or an additional elastic member, thereby limiting the liquid suction channel 213 to one-way conduction. This facilitates the disassembly, assembly, and maintenance of the one-way valve 220.

[0053] In some embodiments of the present invention, a liquid inlet 180 is provided in the wall of the primary wax chamber 110. This facilitates timely replenishment of the wax liquid. Liquid inlet 180 can be connected to a refill pump. A liquid level sensor located in the primary wax chamber 110 controls the start and stop of the refill pump, thereby achieving automatic control of the refill process.

[0054] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A nozzle wax liquid circulation device, characterized in that: include: A print head having an ink chamber, with nozzle interfaces at both ends of the ink chamber, the two nozzle interfaces being respectively provided with a first inlet and a first outlet; The main block is provided with a primary wax cavity and a secondary wax cavity, the tops of the primary wax cavity and the secondary wax cavity are open, and a reflux channel is provided in the main block, one end of the reflux channel is called a connecting end, and the connecting end is provided on the top surface of the main block; the bottom of the primary wax cavity is provided with a first channel for connecting to a first inlet, and the bottom of the secondary wax cavity is provided with a second channel for connecting to a first outlet, and a third channel connected to the reflux channel; A top cover is provided on the top of the main block, and a first-level groove and a second-level groove are provided on the bottom surface of the top cover, which correspond to the first-level wax cavity and the second-level wax cavity one by one. The groove walls of the first-level groove and the second-level groove are respectively provided with a negative pressure interface; the top cover is provided with a reflux pump, and a liquid suction channel and a liquid discharge channel are provided in the top cover, the liquid suction channel is connected between the connecting end and the liquid suction port of the reflux pump, and the liquid discharge channel is connected between the first-level wax cavity and the liquid discharge port of the reflux pump; The print head has two ink chambers, the main block and the top cover are collectively referred to as a circulation assembly, there are two circulation assemblies, and the two circulation assemblies are connected to the two ink chambers in a one-to-one correspondence; The two circulation assemblies are respectively referred to as the first assembly and the second assembly, the two ink chambers are respectively referred to as the first chamber and the second chamber, and all the first channels and the second channels are vertically arranged middle through holes; the lower side of the main block is sequentially stacked with a first bottom plate and a second bottom plate; The bottom surface of the main block or the top surface of the first bottom plate is provided with a plurality of first transition flow channels, the first bottom plate is provided with a plurality of first-first through holes, the plurality of first transition flow channels are connected one-to-one between the plurality of first-first through holes and the plurality of intermediate through holes of the first component, the second bottom plate is provided with a second-first through hole corresponding to each of the first-first through holes; the plurality of second-first through holes are connected one-to-one above the nozzle interfaces of all the first cavities; A plurality of second transition flow channels are provided on the bottom surface of the first bottom plate or the top surface of the second bottom plate, and both ends of each of the second transition flow channels are respectively connected to the first through holes provided on the first bottom plate and the second through holes provided on the second bottom plate. The plurality of first through holes are connected one-to-one with the plurality of middle through holes of the second component, and the plurality of second through holes are connected one-to-one with the top of the nozzle interfaces of all the second cavities.

2. The nozzle wax liquid circulation device according to claim 1, characterized in that: There are multiple print heads, and the secondary wax chamber, the first channel, the second channel, the third channel, and the secondary grooves are collectively referred to as a circulation unit. There are multiple circulation units, and multiple print heads and multiple circulation units are connected one-to-one; for any of the circulation units, the third channel is provided with a shut-off valve.

3. The nozzle wax liquid circulation device according to claim 2, characterized in that: The plurality of secondary wax cavities are sequentially spaced apart and arranged on the rear side of the primary wax cavity in a transverse direction.

4. The nozzle wax liquid circulation device according to claim 3, characterized in that: The return channel has a transverse section and a vertical section, the connecting end is located at the top end of the vertical section, and the third channel is connected to the transverse section.

5. The nozzle wax liquid circulation device according to claim 1, characterized in that: The main blocks of the two circulation components are an integral component.

6. The nozzle wax liquid circulation device according to claim 1, characterized in that: The second-first through hole and the second-second through hole are both referred to as second through holes; the second through hole is connected to the nozzle interface via a vertically arranged connecting pipe.

7. The nozzle wax liquid circulation device according to claim 1, characterized in that: The liquid suction channel is provided with a one-way valve.

8. The nozzle wax liquid circulation device according to claim 1, characterized in that: The cavity wall of the first-level wax cavity is provided with a liquid inlet.

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