Printhead assembly

Abstract

A printhead assembly is provided. The printing head assembly comprises a printing head body which is provided with a material storage channel and an exhaust channel communicated with the material storage channel; and the exhaust mechanism is provided with an operation part and a blocking part in linkage arrangement with the operation part, the operation part is located outside the printing head body, the blocking part is movably arranged in the material storage channel, when the blocking part is located at the blocking position, the function of closing the exhaust channel is achieved, and when the blocking part is located at the exhaust position, the function of opening the exhaust channel is achieved. According to the technical scheme, the problem that in the prior art, exhaust operation of a printing head assembly is inconvenient is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a print head assembly. Background Art

[0002] Solid-state batteries have the advantages of high energy density, long cycle life, and high safety. They overcome the shortcomings of traditional liquid batteries and will become the mainstream of battery technology in the future. In the preparation process of solid-state batteries, the molding and densification of materials is a very important link. In the preparation process of solid-state batteries, there are two molding technologies for positive electrode sheets and solid electrolyte membranes: dry and wet. Among them, wet molding has advantages in molding quality, efficiency and cost. In wet molding, the material form is slurry, and the more common molding methods are scraping and 3D printing. 3D printing is a molding method that has emerged in recent years. Its advantage is that it can achieve both plane molding and complex three-dimensional curved surface molding. Summary of the invention

[0003] In the prior art, when a solid-state battery is printed with a 3D printer, the syringe needs to be vented first. The current venting method mostly adopts a method of setting an exhaust port on the piston of the syringe, installing a sealing plug on the exhaust port, removing the piston when venting, and installing the piston again after the gas is exhausted; however, when the gas in the syringe is exhausted, the piston is located inside the syringe, and it is difficult to install the sealing plug on the exhaust port, which causes inconvenience in operation.

[0004] In order to solve the above-mentioned technical problems, the present invention provides a print head assembly, comprising: a print head body, having a material storage channel and an exhaust channel connected to the material storage channel; an exhaust mechanism, the exhaust mechanism having an operating part and a blocking part linked to the operating part, the operating part is located outside the print head body, the blocking part is movably arranged in the material storage channel, and has the function of closing the exhaust channel when the blocking part is in the blocking position, and has the function of opening the exhaust channel when the blocking part is in the exhaust position.

[0005] As an embodiment, the print head body includes: a material storage barrel, a material storage channel is formed inside the material storage barrel; a pushing rod, a first end of the pushing rod is movably arranged in the material storage barrel, and a second end of the pushing rod extends out of the material storage barrel, and a mounting channel is provided on the pushing rod, and the mounting channel extends along the axial direction of the pushing rod, and an exhaust mechanism is movably connected to the mounting channel, one end of the exhaust mechanism extends out of the second end of the pushing rod to form an operating part, and the other end of the exhaust mechanism extends out of the first end of the pushing rod and is movably arranged in the material storage channel to form a blocking part for closing or opening the exhaust channel.

[0006] As an embodiment, the print head body also includes a piston component connected to the first end of the pushing rod, the piston component is located inside the material storage channel, a receiving groove is provided on the piston component, the receiving groove is connected to the installation channel, the exhaust channel is connected to the receiving groove, the sealing portion of the exhaust mechanism is inserted into the receiving groove through the installation channel, and at least part of the sealing portion is movably arranged in the receiving groove.

[0007] As an embodiment, a sealing portion is provided on the periphery of the piston component for sealingly cooperating with the inner wall of the storage barrel, the piston component includes an exhaust channel, the exhaust channel includes an air inlet channel and an air outlet channel connected to the accommodating groove, the sealing portion is moved to the exhaust position, the air inlet channel and the air outlet channel are connected via the accommodating groove, the sealing portion is moved to the blocking position, and the air inlet channel and the air outlet channel are disconnected via the sealing portion.

[0008] As an embodiment, the piston member is a cylindrical structure, which includes an open end and a closed end. The open end of the cylindrical structure is connected to the installation channel, and the closed end of the cylindrical structure is provided with an air inlet channel. The circumferential side wall of the cylindrical structure is provided with an air outlet channel, and an accommodating groove is formed inside the cylindrical structure; the blocking portion is movably arranged in the accommodating groove of the piston member, and the blocking portion is sealed and cooperated with the cylindrical structure; when the blocking portion moves to the side away from the air inlet channel and moves to the exhaust position, the air outlet channel is opened; when the blocking portion moves to the side close to the air inlet channel and moves to the blocking position, the air outlet channel is closed.

[0009] As an embodiment, the circumferential outer wall of the sealing portion is sealingly matched with the circumferential inner wall of the cylindrical structure; and / or, the side of the sealing portion facing the closed end of the cylindrical structure is provided with a sealing surface that can seal with the closed end of the cylindrical structure.

[0010] As an embodiment, along the axial direction of the piston member, a accommodating groove passes through the piston member, and an air outlet channel is provided on the circumferential side wall of the piston member, one end of the sealing portion passes through the accommodating groove and is located on the side of the piston member away from the pushing rod, and the side of the sealing portion away from the piston member is provided with a sealing surface that cooperates with the piston member, and the inner wall gap of the sealing portion and the accommodating groove cooperates to form an air inlet channel, when the sealing portion moves to the side away from the pushing rod and moves to the exhaust position, the sealing surface moves away from the air inlet channel, the air inlet channel is opened, and the material storage channel is connected with the air outlet channel through the air inlet channel; when the sealing portion moves to the side close to the pushing rod and moves to the blocking position, the sealing surface blocks the air inlet channel, the air inlet channel is closed, and the material storage channel is disconnected from the air outlet channel.

[0011] As an embodiment, the exhaust mechanism includes a connecting rod and a blocking member connected to the connecting rod, and the connecting rod is movably connected to the installation channel; wherein, one end of the connecting rod away from the blocking member forms an operating part, and the blocking member forms a blocking part.

[0012] As an embodiment, at least a portion of the connecting rod is threadably engaged with the mounting channel.

[0013] As an embodiment, when the accommodating groove passes through the piston component, the sealing member includes a main sealing body and an auxiliary sealing body. The main sealing body is located on the side of the piston component away from the pushing rod, and a sealing surface is provided on the side of the main sealing body facing the piston component. The auxiliary sealing body is used to connect the main sealing body and the connecting rod. The outer diameter of the auxiliary sealing body gradually increases from the connecting rod to the sealing member; the accommodating groove includes a first channel and a second channel connected to the first channel. The inner diameter of the second channel gradually increases from the pushing rod to the piston component. The connecting rod is moved to make the auxiliary sealing body and the second channel sealingly fit or clearance fit.

[0014] By applying the technical solution of the present invention, the print head body has a material storage channel, which can provide a conveying path for the printing material, and the exhaust channel connected to the material storage channel can provide an effective gas exhaust channel for the print head assembly, which can timely release the gas accumulated inside the material storage channel, thereby preventing the gas from affecting the extrusion accuracy of the printing material and the stability of the printing process; wherein, the sealing part of the exhaust mechanism is movably arranged in the material storage channel, and the operating part of the exhaust mechanism is located outside the print head body, so that the sealing part can be moved directly by operating the operating part, thereby controlling the opening and closing of the exhaust channel, without the need to insert additional tools into the syringe to install the sealing plug, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a 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 of the present invention. In the drawings:

[0016] Figure 1 A schematic structural diagram of an embodiment of a print head assembly of the present invention is shown;

[0017] Figure 2 Shows Figure 1 A cross-sectional view of a first embodiment of a print head assembly;

[0018] Figure 3 Shows Figure 2 A partial enlarged view of a print head assembly;

[0019] Figure 4 Shows Figure 1 A cross-sectional view of a second embodiment of the print head assembly (the blocking portion is located at the blocking position);

[0020] Figure 5 Shows Figure 4 A partial enlarged view of a print head assembly;

[0021] Figure 6Shows Figure 1 A cross-sectional view of a second embodiment of the print head assembly (the blocking portion is located at the exhaust position);

[0022] Figure 7 Shows Figure 6 A partial enlarged view of the print head assembly.

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

[0024] 10. Print head body; 11. Material storage channel; 13. Material pushing rod; 131. Installation channel; 14. Piston member; 141. Receiving groove; 1411. First channel; 1412. Second channel; 142. Sealing part; 143. Air inlet channel; 144. Air outlet channel; 15. Material storage barrel; 16. Stepper motor; 17. Filter; 18. Material outlet; 20. Exhaust mechanism; 21. Operating part; 22. Sealing part; 23. Auxiliary sealing body; 24. Connecting rod; 25. Sealing surface; 26. Main sealing body. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figures 1 to 7 As shown, an embodiment of the present invention provides a print head assembly. The print head assembly includes: a print head body 10 having a material storage channel 11 and an exhaust channel connected to the material storage channel 11; an exhaust mechanism 20, the exhaust mechanism 20 having an operating portion 21 and a blocking portion 22 arranged in linkage with the operating portion 21, the operating portion 21 is located outside the print head body 10, the blocking portion 22 is movably arranged in the material storage channel 11, and has a function of closing the exhaust channel when the blocking portion 22 is located in the blocking position, and has a function of opening the exhaust channel when the blocking portion 22 is located in the exhaust position.

[0027] In the above technical solution, the print head body 10 has a material storage channel 11, which can provide a conveying path for the printing material, and the exhaust channel connected to the material storage channel 11 can provide an effective gas exhaust channel for the print head assembly, which can timely release the gas accumulated inside the material storage channel 11, thereby avoiding the gas from affecting the extrusion accuracy of the printing material and the stability of the printing process; wherein, the blocking portion 22 of the exhaust mechanism 20 is movably arranged in the material storage channel 11, and the operating portion 21 of the exhaust mechanism 20 is located outside the print head body 10, so that there is no need to insert additional tools into the syringe to install the sealing plug, and the blocking portion 22 can be directly moved by operating the operating portion 21, thereby controlling the opening and closing of the exhaust channel, thereby solving the complexity and inconvenience of the traditional exhaust method in operation.

[0028] Specifically, in the embodiment of the present invention, in the pre-print preparation stage, the blocking part 22 moves to the exhaust position, opening the exhaust channel, which can quickly discharge the gas accumulated in the material storage channel 11, avoiding the formation of bubbles during the material extrusion process and affecting the uniformity of the printing material and the density of the printed structure; during the printing process, the blocking part 22 moves to the blocking position, tightly closing the exhaust channel, preventing gas leakage, maintaining the stable pressure inside the print head, ensuring the uniformity and accuracy of the material extrusion, avoiding the interference of gas emission on the printing process, and improving the printing quality and efficiency.

[0029] As Figure 2 , Figure 4 and Figure 6 As shown, in the embodiment of the present invention, the print head body 10 includes: a material storage cylinder 15, and a material storage channel 11 is formed inside the material storage cylinder 15; a material pushing rod 13, the first end of the material pushing rod 13 is movably arranged inside the material storage cylinder 15, the second end of the material pushing rod 13 extends out of the material storage cylinder 15, an installation channel 131 is provided on the material pushing rod 13, the installation channel 131 extends along the axial direction of the material pushing rod 13, the exhaust mechanism 20 is movably connected to the installation channel 131, one end of the exhaust mechanism 20 extends out of the second end of the material pushing rod 13 to form an operation part 21, and the other end of the exhaust mechanism 20 extends out of the first end of the material pushing rod 13 and is movably arranged in the material storage channel 11 to form a blocking part 22 for closing or opening the exhaust channel.

[0030] In the above technical solution, a material storage channel 11 is formed inside the material storage cylinder 15, which can store and transport the printing material. The first end of the material pushing rod 13 is movably arranged inside the material storage cylinder 15, and the second end of the material pushing rod 13 extends out of the material storage cylinder 15. In this way, the material pushing rod 13 can push the printing material through the material storage channel 11 according to the printing requirements. At the same time, an installation channel 131 is provided on the material pushing rod 13, which extends along its axial direction, providing a platform for the movable connection of the exhaust mechanism 20, enabling the exhaust mechanism 20 to form a stable and adjustable connection with the material pushing rod 13. One end of the exhaust mechanism 20 extends out of the second end to form an operation part 21, facilitating the user to operate outside the print head body 10 to control the movement of the blocking part 22. The other end of the exhaust mechanism 20 extends out of the first end to form a blocking part 22. When the blocking part 22 is in the blocking position, it can tightly close the exhaust channel communicating with the material storage channel 11, preventing gas leakage and maintaining the stability of the printing process and the purity of the material extrusion; when the blocking part 22 moves to the exhaust position, it can open the exhaust channel, quickly release the gas in the material storage channel 11, avoid the formation of bubbles, ensure the uniform extrusion of the printing material and the density of the printed structure, thereby improving the printing quality and efficiency.

[0031] As Figure 3 , Figure 4 and Figure 7As shown, in an embodiment of the present invention, the print head body 10 further includes a piston member 14 connected to the first end of the pusher rod 13. The piston member 14 is located inside the material storage channel 11. A receiving groove 141 is provided on the piston member 14. The receiving groove 141 communicates with the installation channel 131. The exhaust channel communicates with the receiving groove 141. The blocking portion 22 of the exhaust mechanism 20 is inserted into the receiving groove 141 through the installation channel 131, and at least part of the blocking portion 22 is movably arranged in the receiving groove 141.

[0032] In the above technical solution, the piston member 14 is connected to the first end of the pusher rod 13. The receiving groove 141 on the piston member 14 not only communicates with the installation channel 131 of the pusher rod 13, but also forms an intercommunication with the exhaust channel. In this way, it can provide a moving space and a platform for the realization of the function for the exhaust mechanism 20. Among them, at least part of the blocking portion 22 can be inserted into the receiving groove 141 through the installation channel 131. By changing the position of the blocking portion 22 in the receiving groove 141, the closing or opening of the exhaust channel is realized.

[0033] Preferably, in an embodiment of the present invention, the pusher rod 13 is a pusher screw.

[0034] As Figure 3 、 Figure 5 and Figure 7 shown, in an embodiment of the present invention, a sealing portion 142 that is hermetically fitted with the inner wall of the material storage cylinder 15 is provided on the outer periphery of the piston member 14. The piston member 14 includes an exhaust channel. The exhaust channel includes an intake channel 143 and an outlet channel 144 that communicate with the receiving groove 141. Move the blocking portion 22 to the exhaust position, and the intake channel 143 and the outlet channel 144 communicate through the receiving groove 141. Move the blocking portion 22 to the blocking position, and the intake channel 143 and the outlet channel 144 are disconnected through the blocking portion 22.

[0035] In the above technical solution, the sealing portion 142 provided on the outer periphery of the piston member 14 forms a sealing fit with the inner wall of the material storage cylinder 15, which can ensure the sealing of the material during the pusher and printing processes, avoid material leakage, maintain the purity of the printing material and the stable pressure during the pusher process. And a receiving groove 141 is provided on the piston member 14, as well as an intake channel 143 and an outlet channel 144 that communicate with the receiving groove 141. In this way, the gas in the material storage channel 11 can enter the inside of the piston member 14 through the intake channel 143 and then be discharged through the outlet channel 144, and the gas discharge can be realized.

[0036] Specifically, in an embodiment of the present invention, the movement of the blocking portion 22 in the receiving groove 141 can directly control the communication state of the intake channel 143 and the outlet channel 144, such as Figure 7As shown, when the blocking part 22 is in the exhaust position, the intake channel 143 and the outlet channel 144 communicate with each other through the accommodating groove 141, and the gas in the material storage channel 11 can be discharged, avoiding the formation of bubbles, ensuring the uniformity and compactness of the extrusion of the printing material, and improving the printing accuracy and the quality of the printed structure; as Figure 5 As shown, when the blocking part 22 moves to the blocking position, the intake channel 143 and the outlet channel 144 are disconnected by the blocking part 22, the exhaust channel is closed, preventing the leakage of gas during the printing process, maintaining the stable pressure inside the print head, and at the same time avoiding the intrusion of external air, so as to ensure the purity of the printing material and improve the stability and reliability of the printing.

[0037] It should be noted that in the embodiments of the present invention, the intake channel 143 and the outlet channel 144 communicate with each other through the accommodating groove 141 to form an exhaust channel.

[0038] Specifically, in the embodiments of the present invention, one end of the piston member 14 close to the discharge port 18 of the material storage cylinder 15 is in close contact with the inner wall of the material storage cylinder 15 (i.e., a sealing part 142 is formed), and there is a gap between the other end of the piston member 14 far from the discharge port 18 of the material storage cylinder 15 and the inner wall of the material storage cylinder 15, so that it is convenient for exhaust.

[0039] As Figures 2 to 5 As shown, in the embodiments of the present invention, the exhaust mechanism 20 includes a connecting rod member 24 and a blocking member connected to the connecting rod member 24, and the connecting rod member 24 is movably connected to the installation channel 131; wherein, one end of the connecting rod member 24 far from the blocking member forms an operation part 21, and the blocking member forms a blocking part 22.

[0040] In the above technical solution, the exhaust mechanism 20 is composed of a connecting rod member 24 and a blocking member. The blocking member is connected to the connecting rod member 24 and forms a blocking part 22, and the connecting rod member 24 is movably connected to the installation channel 131. One end of it far from the blocking part 22 forms an operation part 21, which is convenient for external manual control of the movement of the exhaust mechanism 20.

[0041] Specifically, in the embodiments of the present invention, in specific operations, through the control of the operation part 21, the connecting rod member 24 moves in the installation channel 131, driving the blocking part 22 to move along the axial direction of the piston member 14, so as to realize the opening and closing of the intake channel 143.

[0042] As Figure 4 As shown, in the embodiments of the present invention, at least part of the connecting rod member 24 is in threaded cooperation with the installation channel 131.

[0043] In the above technical solution, through the threaded fit, rotating the operation part 21 can move the connecting rod member 24, so that the blocking part 22 can move relative to the piston member 14 to open or close the air inlet channel 143, thereby controlling the discharge of the gas in the material storage channel 11.

[0044] Furthermore, the design of the threaded fit makes the movement of the blocking part 22 more stable and precise, avoiding jitter and errors in gas discharge control, ensuring the timeliness and sufficiency of gas discharge, effectively reducing the formation of bubbles in the printing material, and ensuring the uniformity of material extrusion and the density of the printed structure.

[0045] Preferably, in the embodiment of the present invention, the air inlet channel 143 and the air outlet channel 144 are respectively located on both sides of the sealing part 142.

[0046] Preferably, in the embodiment of the present invention, the piston member 14 is made of Teflon, and the material storage cylinder 15 is made of borosilicate glass.

[0047] Embodiment 1

[0048] As Figure 2 and Figure 3 shown, in Embodiment 1 of the present invention, the piston member 14 is a cylindrical structure. The cylindrical structure includes an open end and a closed section. The open end of the cylindrical structure is communicated with the installation channel 131. The closed end of the cylindrical structure is provided with an air inlet channel 143. An air outlet channel 144 is provided on the circumferential side wall of the cylindrical structure. A receiving groove 141 is formed inside the cylindrical structure. The blocking part 22 is movably arranged in the receiving groove 141 of the piston member 14, and the blocking part 22 is in sealing fit with the cylindrical structure. When the blocking part 22 moves to the exhaust position on the side away from the air inlet channel 143, the air outlet channel 144 is opened. When the blocking part 22 moves to the blocking position on the side close to the air inlet channel 143, the air outlet channel 144 is closed.

[0049] Through the above settings, the air inlet channel 143 opened on the closed end, the air outlet channel 144 on the circumferential side wall of the cylindrical structure, and the receiving groove 141 formed inside the cylindrical structure together constitute an exhaust channel that can pass gas, so as to effectively discharge the gas before material extrusion.

[0050] Specifically, in the first embodiment of the present invention, the blocking portion 22 is movably arranged and forms a sealing fit with the cylindrical structure, so that the position change of the blocking portion 22 can control the opening and closing of the exhaust channel. When the blocking portion 22 moves to the exhaust position away from the air inlet channel 143, the air outlet channel 144 is opened, and the gas in the storage barrel 15 can enter the piston member 14 through the air inlet channel 143, and then be discharged through the air outlet channel 144, which effectively reduces the influence of the gas in the material on the printing accuracy, ensures the uniform extrusion of the printing material and the density of the printing structure; when the blocking portion 22 moves to the blocking position close to the air inlet channel 143, the air outlet channel 144 is closed by the blocking portion 22, preventing the leakage of gas during the printing process, maintaining the stability of the internal pressure of the print head, and also avoiding the intrusion of external air, further ensuring the purity of the printing material and the stability of the printing process.

[0051] Specifically, Figure 3 As shown, in the first embodiment of the present invention, the open end of the cylindrical structure is connected to the pushing rod 13. Preferably, part of the cylindrical structure extends into the installation channel 131 and is threadedly connected to the inner wall of the installation channel 131. In this way, it can be ensured that the pushing rod 13 can smoothly push the piston member 14 forward, thereby achieving accurate extrusion of the printing material.

[0052] like Figure 3 As shown, in the first embodiment of the present invention, the circumferential outer wall of the sealing portion 22 is sealed with the circumferential inner wall of the cylindrical structure.

[0053] In the above technical solution, by the sealing cooperation between the circumferential outer wall of the sealing portion 22 and the circumferential inner wall of the cylindrical structure, when the sealing portion 22 is moved to the sealing position, the sealing portion 22 is located between the air inlet channel 143 and the air outlet channel 144, and the connection between the air outlet channel 144 and the air inlet channel 143 can be disconnected, so that the air outlet channel 144 can be tightly closed, effectively preventing gas leakage, maintaining a stable pressure inside the print head body 10, avoiding the intrusion of external air, and ensuring the purity of the printing material and the sealing of the material pushing process; when the sealing portion 22 is operated to the exhaust position, the blocking portion 22 is located on the side of the air outlet channel 144 away from the air inlet channel 143, and the air outlet channel 144 and the air inlet channel 143 are both exposed to the outside, so that the air inlet channel 143 and the air outlet channel 144 are connected, so that the air outlet channel 144 is opened, and the gas in the storage channel 11 can smoothly enter the receiving groove 141 through the air inlet channel 143, and then be discharged through the air outlet channel 144, thereby realizing the rapid discharge of gas, avoiding the formation of bubbles, ensuring the uniformity of the extrusion of the printing material and the density of the printing structure, thereby improving the printing quality and efficiency.

[0054] Preferably, in the first embodiment of the present invention, the sealing surface 25 of the blocking portion 22 can abut against the closed end.

[0055] like Figure 3 As shown, in the first embodiment of the present invention, a sealing surface 25 capable of sealingly cooperating with the closed end of the cylindrical structure is provided on one side of the sealing portion 22 facing the closed end of the cylindrical structure.

[0056] In the above technical solution, when the blocking portion 22 moves to the blocking position, the sealing surface 25 fits tightly against the closed end of the piston member 14, effectively closing the air inlet channel 143, thereby further preventing accidental leakage of gas during printing, maintaining a stable pressure inside the print head, and avoiding the mixing of external air, thereby ensuring the purity of the printing material and the sealing of the extrusion process.

[0057] Embodiment 2

[0058] like Figures 4 to 7 As shown, the difference between the second embodiment of the present invention and the first embodiment is that, along the axial direction of the piston member 14, the accommodating groove 141 passes through the piston member 14, and the circumferential side wall of the piston member 14 is provided with an air outlet channel 144, one end of the blocking portion 22 passes through the accommodating groove 141 and is located on the side of the piston member 14 away from the push rod 13, and the side of the blocking portion 22 away from the piston member 14 is provided with a sealing surface 25 that cooperates with the piston member 14, and the inner wall gap between the blocking portion 22 and the accommodating groove 141 is matched. Together, they form an air inlet channel 143. When the blocking portion 22 moves to the side away from the pushing rod 13 and moves to the exhaust position, the sealing surface 25 moves away from the air inlet channel 143, the air inlet channel 143 is opened, and the storage channel 11 is connected with the air outlet channel 144 through the air inlet channel 143. When the blocking portion 22 moves to the side close to the pushing rod 13 and moves to the blocking position, the sealing surface 25 blocks the air inlet channel 143, the air inlet channel 143 is closed, and the storage channel 11 is disconnected from the air outlet channel 144.

[0059] In the above technical solution, one end of the blocking part 22 passes through the accommodating groove 141 and is located on the side of the piston member 14 away from the material pushing rod 13. A sealing surface 25 cooperating with the piston member 14 is provided on the side of the blocking part 22 away from the piston member 14. The blocking part 22 can form an air inlet passage 143 through clearance fit with the inner wall of the accommodating groove 141. In this way, the movement of the blocking part 22 can realize the selective communication between the air inlet passage 143 and the material storage passage 11. Among them, when the blocking part 22 moves to the exhaust position on the side away from the piston member 14, the sealing surface 25 keeps a distance from the air inlet passage 143. At this time, the air inlet passage 143 is opened, and the gas in the material storage passage 11 can be smoothly discharged through the air inlet passage 143 and the air outlet passage 144, avoiding the formation of bubbles in the printing material, ensuring the uniformity of material extrusion and the compactness of the printing structure, and significantly improving the printing quality and efficiency; when the blocking part 22 moves to the blocking position on the side close to the piston member 14, the sealing surface 25 tightly blocks the air inlet passage 143, so that the air inlet passage 143 is closed, and the gas flow between the material storage passage 11 and the air outlet passage 144 is cut off, preventing gas leakage during the printing process, maintaining the stable pressure inside the print head, and at the same time avoiding the intrusion of external air, further ensuring the purity of the printing material and the sealing performance of the extrusion process.

[0060] As Figures 5 to 7 shown, in the second embodiment of the present invention, when the accommodating groove 141 penetrates the piston member 14, the blocking member includes a main blocking body 26 and an auxiliary blocking body 23. The main blocking body 26 is located on the side of the piston member 14 away from the material pushing rod 13. A sealing surface 25 is provided on the side of the main blocking body 26 facing the piston member 14. The auxiliary blocking body 23 is used to connect the main blocking body 26 and the connecting rod member 24. From the direction of the connecting rod member 24 to the blocking member, the outer diameter of the auxiliary blocking body 23 gradually increases; the accommodating groove 141 includes a first passage 1411 and a second passage 1412 communicating with the first passage 1411. From the direction of the material pushing rod 13 to the piston member 14, the inner diameter of the second passage 1412 gradually increases. Move the connecting rod member 24 to make the auxiliary blocking body 23 in sealing fit or clearance fit with the second passage 1412.

[0061] In the above technical solution, the sealing surface 25 can block or open the air inlet passage 143, and the auxiliary blocking body 23 can form a sealing or clearance fit with the second passage 1412. Through the double sealing effect of the main blocking body 26 and the auxiliary blocking body 23, the blocking effect of the air inlet passage 143 can be improved, the gas flow between the material storage passage 11 and the air outlet passage 144 can be cut off, so as to maintain the stable pressure inside the print head, avoid the intrusion of external air, and ensure the purity of the printing material and the sealing performance of the extrusion process.

[0062] Specifically, in the second embodiment of the present invention, the auxiliary plugging body 23 is used to connect the main plugging body 26 and the connecting rod member 24, ensuring stable linkage between the two.

[0063] Preferably, in the second embodiment of the present invention, the connecting rod member 24 is in clearance fit with the first channel 1411.

[0064] Preferably, in the second embodiment of the present invention, the main plugging body 26 is a plug, and the auxiliary plugging body 23 is a sealing plate.

[0065] Other structures of the second embodiment are the same as those of the first embodiment and will not be described herein again.

[0066] It should be noted that in the embodiments of the present invention, the print head assembly further includes a stepper motor 16, a filter screen 17 disposed in the storage cylinder 15. The pusher rod member 13, the exhaust mechanism 20, and the piston member 14 together with the stepper motor 16 form a pusher mechanism. The stepper motor 16 receives pulses to drive the pusher mechanism to extrude the material. Among them, the stepper motor 16 is a middle lead screw type stepper motor.

[0067] Specifically, in the embodiments of the present invention, after the storage cylinder 15 is filled with printing paste, the pusher mechanism enters the storage cylinder 15 under the drive of the stepper motor 16, and a section of air will be enclosed at this time. The first exhaust method is: loosen the locking nut of the exhaust mechanism 20, and push the exhaust mechanism 20 towards the discharge port of the storage cylinder 15 for a certain distance. At this time, the enclosed air can be discharged from the gap of the exhaust mechanism 20. After the piston member 14 is close to the slurry liquid level, withdraw the exhaust mechanism 20, seal and lock it. The second exhaust method is: by rotating the exhaust mechanism 20, the exhaust mechanism 20 is urged to move away from the discharge port 18 of the storage cylinder 15. At this time, the gas enters the inside of the piston member 14 through the intake channel and is discharged to the outside of the piston member 14 through the outlet channel. The stepper motor 16 receives pulses to drive the pusher mechanism to advance in a spiral manner. After the slurry is filtered by the filter screen 17 to remove large particles, it is discharged from the discharge port 18, passes through the print head material pipe, and the material is transported to the high-frequency vibration print head for printing and forming.

[0068] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: The print head body has a material storage channel that can provide a conveying path for the printing material, and the exhaust channel communicating with the material storage channel can provide an effective gas discharge channel for the print head assembly, which can timely release the gas accumulated inside the material storage channel, thereby avoiding the influence of gas on the extrusion accuracy of the printing material and the stability of the printing process; wherein, the blocking part of the exhaust mechanism is movably arranged in the material storage channel, and the operating part of the exhaust mechanism is located outside the print head body. In this way, without inserting an additional tool into the syringe to install the sealing plug, the blocking part can be directly moved by operating the operating part, so as to facilitate manual operation to control the opening and closing of the exhaust channel, and further avoid the complexity and inconvenience of the traditional exhaust method in operation.

[0069] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A print head assembly, characterized in that, include: A print head body (10) having a material storage channel (11) and an exhaust channel communicated with the material storage channel (11); An exhaust mechanism (20), the exhaust mechanism (20) comprising an operating portion (21) and a blocking portion (22) arranged in linkage with the operating portion (21), the operating portion (21) being located outside the print head body (10), the blocking portion (22) being movably arranged in the material storage channel (11), having a function of closing the exhaust channel when the blocking portion (22) is located in a blocking position, and having a function of opening the exhaust channel when the blocking portion (22) is located in an exhaust position.

2. The printhead assembly according to claim 1, wherein, The print head body (10) comprises: A material storage barrel (15), wherein the material storage channel (11) is formed inside the material storage barrel (15); A push rod (13), wherein the first end of the push rod (13) is movably arranged in the material storage barrel (15), and the second end of the push rod (13) extends out of the material storage barrel (15). The push rod (13) is provided with a mounting channel (131), and the mounting channel (131) extends along the axial direction of the push rod (13). The exhaust mechanism (20) is movably connected to the mounting channel (131), and one end of the exhaust mechanism (20) extends out of the second end of the push rod (13) to form the operating part (21), and the other end of the exhaust mechanism (20) extends out of the first end of the push rod (13) and is movably arranged in the material storage channel (11) to form the blocking part (22) for closing or opening the exhaust channel.

3. The printhead assembly according to claim 2, wherein, The print head body (10) further comprises a piston component (14) connected to the first end of the pushing rod (13); the piston component (14) is located inside the material storage channel (11); a receiving groove (141) is provided on the piston component (14); the receiving groove (141) is communicated with the mounting channel (131); the exhaust channel is communicated with the receiving groove (141); the blocking portion (22) of the exhaust mechanism (20) is inserted into the receiving groove (141) through the mounting channel (131); and at least a portion of the blocking portion (22) is movably arranged in the receiving groove (141).

4. The printhead assembly according to claim 3, wherein The outer periphery of the piston component (14) is provided with a sealing portion (142) which is sealed with the inner wall of the storage barrel (15); the piston component (14) includes the exhaust channel, and the exhaust channel includes an air inlet channel (143) and an air outlet channel (144) which are connected to the accommodating groove (141); when the blocking portion (22) is moved to the exhaust position, the air inlet channel (143) and the air outlet channel (144) are connected via the accommodating groove (141); when the blocking portion (22) is moved to the blocking position, the air inlet channel (143) and the air outlet channel (144) are disconnected via the blocking portion (22).

5. The printhead assembly according to claim 4, wherein The piston member (14) is a cylindrical structure, the cylindrical structure comprising an open end and a closed end, the open end of the cylindrical structure being in communication with the mounting channel (131), the closed end of the cylindrical structure being provided with the air inlet channel (143), the circumferential side wall of the cylindrical structure being provided with the air outlet channel (144), and the interior of the cylindrical structure forming the accommodating groove (141); The blocking portion (22) is movably disposed in the receiving groove (141) of the piston component (14), and the blocking portion (22) is sealingly matched with the cylindrical structure; When the blocking portion (22) moves to a side away from the air inlet channel (143) and moves to an exhaust position, the air outlet channel (144) opens; when the blocking portion (22) moves to a side close to the air inlet channel (143) and moves to a blocking position, the air outlet channel (144) closes.

6. The print head assembly according to claim 5, characterized in that, The circumferential outer wall of the sealing portion (22) is sealed with the circumferential inner wall of the cylindrical structure; and / or, A sealing surface (25) capable of sealingly cooperating with the closed end of the tubular structure is provided on one side of the sealing portion (22) facing the closed end of the tubular structure.

7. The printhead assembly according to claim 4, wherein, Along the axial direction of the piston member (14), the receiving groove (141) passes through the piston member (14); the circumferential side wall of the piston member (14) is provided with the air outlet passage (144); one end of the blocking portion (22) passes through the receiving groove (141) and is located on the side of the piston member (14) away from the push rod (13); the side of the blocking portion (22) away from the piston member (14) is provided with a sealing surface (25) cooperating with the piston member (14); the inner wall gap of the blocking portion (22) and the receiving groove (141) cooperates to form the air inlet passage (143); When the blocking portion (22) moves toward a side away from the pushing rod (13) and moves to the exhaust position, the sealing surface (25) moves away from the air inlet channel (143), the air inlet channel (143) is opened, and the storage channel (11) is connected with the air outlet channel (144) through the air inlet channel (143); when the blocking portion (22) moves toward a side close to the pushing rod (13) and moves to the blocking position, the sealing surface (25) blocks the air inlet channel (143), the air inlet channel (143) is closed, and the storage channel (11) is disconnected from the air outlet channel (144).

8. The printhead assembly according to any one of claims 2 to 7, characterized in that, The exhaust mechanism (20) comprises a connecting rod (24) and a blocking member connected to the connecting rod (24), wherein the connecting rod (24) is movably connected to the installation channel (131); wherein an end of the connecting rod (24) away from the blocking member forms the operating portion (21), and the blocking member forms the blocking portion (22).

9. The printhead assembly according to claim 8, wherein, At least a portion of the connecting rod (24) is threadedly engaged with the mounting channel (131).

10. The print head assembly according to claim 8, wherein When the accommodating groove (141) passes through the piston member (14), the blocking member comprises a main blocking body (26) and an auxiliary blocking body (23); the main blocking body (26) is located on the side of the piston member (14) away from the pushing rod (13); a sealing surface (25) is provided on the side of the main blocking body (26) facing the piston member (14); the auxiliary blocking body (23) is used to connect the main blocking body (26) and the connecting rod (24); and the outer diameter of the auxiliary blocking body (23) gradually increases in the direction from the connecting rod (24) to the blocking member; The accommodating groove (141) includes a first channel (1411) and a second channel (1412) connected to the first channel (1411). The inner diameter of the second channel (1412) gradually increases from the pushing rod (13) to the piston member (14). The connecting rod (24) is moved to make the auxiliary sealing body (23) and the second channel (1412) have a sealing fit or a clearance fit.

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