A 3D printer glaze jetting print head

Abstract

The application discloses a 3D printer glaze spraying head, which aims to solve the problems of manual operation, high labor intensity and low work efficiency of ceramic glaze spraying. The application comprises a storage tank for loading glaze, a glaze spraying body for connecting with a 3D printer, a jet nozzle installed on the glaze spraying body for spraying high-pressure air flow, and a discharge pipe with one end connected to the storage tank and the other end opening close to the opening end of the jet nozzle. The jet nozzle sprays high-pressure air flow to generate negative pressure at the opening end of the discharge pipe, so that the discharge pipe draws glaze in the storage tank and discharges the glaze from the opening end of the discharge pipe, and the high-pressure air flow blows the discharged glaze to the surface of a ceramic product. The 3D printer glaze spraying head can automatically realize glaze spraying operation, reduce labor intensity, improve work efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the field of ceramic processing technology, and more specifically, to a 3D printer enamel spray printhead. Background Technology

[0002] Currently, in the processing of ceramic products, glazing is required to reduce the water absorption rate of ceramics, making them more aesthetically pleasing, increasing surface hardness, and extending their service life. Traditional glazing involves manual operation using a handheld spray gun to apply the glaze to the ceramic surface. This method is labor-intensive, inefficient, and the quality of the glaze depends heavily on the worker's experience; many inexperienced workers fail to meet quality requirements. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides a 3D printer glazing printhead that can automatically perform glazing operations, thereby reducing labor intensity and improving work efficiency and product quality.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a 3D printer enameling printhead, comprising:

[0005] Storage bins, used to hold glaze materials;

[0006] The glazing body is used to connect to the 3D printer;

[0007] The jet nozzle is mounted on the glazing body and is used to spray high-pressure airflow.

[0008] The discharge pipe is connected to the storage box at one end and the other end is set near the opening of the air nozzle.

[0009] The jet nozzle ejects a high-pressure airflow, creating a negative pressure at the opening of the discharge pipe. This causes the discharge pipe to draw glaze from the storage tank and discharge it from the opening. The high-pressure airflow then blows the discharged glaze onto the surface of the ceramic product.

[0010] The glazing body of the 3D printer's glazing printhead is mounted on an existing 3D printer, enabling spatial movement and thus 3D glazing operations. During operation, high-pressure airflow is ejected from the nozzle, creating a negative pressure at the outlet pipe opening. This causes the outlet pipe to draw glaze material from the storage tank and discharge it through the outlet pipe opening. The high-pressure airflow then blows the discharged glaze material onto the surface of the ceramic product, achieving the glazing operation. This 3D printer glazing printhead of the present application can automatically perform the glazing operation, reducing labor intensity and improving work efficiency and product quality.

[0011] Preferably, a turntable driven by a motor is installed inside the glazing body. An annular cavity is set between the outer wall of the turntable and the inner wall of the glazing body. An air jet through hole communicating with the annular cavity is provided on the end face of the turntable. An air inlet connector is provided on the glazing body and communicates with the annular cavity. A switching seat is provided inside the glazing body. The end face of the turntable is sealed and fitted with the switching seat. An air jet hole communicating with the air jet nozzle is provided on the switching seat. The rotation of the turntable causes the air jet through hole and the air jet hole to separate and connect, thereby realizing the cut-off and connection of airflow.

[0012] The motor drives the turntable to rotate, thus controlling the airflow. When glazing is not required, the air jet orifice on the turntable is disconnected from the spray nozzle on the switching seat, preventing high-pressure airflow from entering the nozzle. When glazing is required, the motor starts, causing the turntable to rotate and connect the air jet orifice with the spray nozzle. High-pressure airflow then enters the nozzle from the inlet and is ejected outwards, achieving glazing. Adjusting the turntable's rotation angle allows for adjustment of the area connecting the air jet orifice and the spray nozzle, thereby adjusting the airflow volume and ultimately the amount of glaze applied, offering flexibility and convenience.

[0013] Preferably, a positioning seat is installed inside the glazing body, and the positioning seat fits into the turntable to achieve positioning of the turntable.

[0014] The positioning seat enables axial positioning of the turntable, ensuring a tight seal between the turntable and the switching seat.

[0015] Preferably, the bottom of the storage tank and the discharge pipe are equipped with sealing plugs. The sealing plugs are connected to the float by a pull rope. When the liquid level in the storage tank is higher than the highest level, the float rises and pulls the sealing plugs upward to cover the discharge pipe.

[0016] When the liquid level in the storage tank is below the maximum level, the float remains at the low level and will not pull the sealing plug. When the liquid level in the storage tank is above the maximum level, the float rises, pulling the sealing plug upwards and sealing the discharge pipe to prevent the liquid level from exceeding the opening of the discharge pipe and causing overflow.

[0017] Preferably, the inner radial opening of the jet nozzle gradually converges.

[0018] This configuration helps to concentrate the airflow and increase the impact force of the ejected airflow.

[0019] Preferably, a cleaning connector is provided at the end of the discharge pipe, and a flow passage is provided on the cleaning connector. A movable sleeve and a valve plate driven by airflow are installed on the cleaning connector. A piston assembly is installed between the movable sleeve and the flow passage, and an air blowing channel is provided on the valve plate. A liquid extraction air hole and a cleaning air hole are provided circumferentially at intervals on the switching seat. A liquid extraction air pipe is connected between the liquid extraction air hole and the cleaning connector, and a cleaning air pipe is connected between the cleaning air hole and the cleaning connector. When the liquid extraction air pipe is vented, it pushes the movable sleeve to move, thereby causing the piston assembly to move inward, and the liquid at the opening end of the flow passage flows inward. When the cleaning air pipe is vented, it pushes the valve plate to move and close the opening position of the flow passage, and blows air into the discharge pipe through the air blowing channel to clean it.

[0020] During glazing operation, the air jet orifice on the turntable is connected to the spray air port on the switching seat. After glazing is completed, the turntable rotates, separating the air jet orifice from the spray air port. Before they are completely separated, the air jet orifice connects to the liquid extraction air port. At this time, airflow enters the liquid extraction air pipe, pushing the movable sleeve to move, thereby moving the piston assembly inward, and the liquid flows inward at the opening of the flow hole. This prevents the glaze from dripping from the opening of the flow hole onto the ceramic product due to inertia at the moment of stopping glazing, thus affecting the glazing effect. The turntable continues to rotate, allowing airflow to enter the cleaning air pipe. The airflow pushes the valve plate to move and close the opening of the flow hole, and blows air into the discharge pipe through the air channel to clean it, sending the residual glaze in the discharge pipe to the storage tank. At the same time, it blows the inner wall of the discharge pipe to prevent residual glaze from clogging the discharge pipe.

[0021] Preferably, the piston assembly includes a piston sleeve, a piston seat, and a positioning spring. A positioning block is connected to the inner wall of the flow hole. The piston sleeve abuts between the positioning spring and the positioning block. The piston seat is connected to the movable sleeve. The movable sleeve moves to make the piston seat abut against the end face of the piston sleeve and close the piston sleeve. The piston seat moves against the piston sleeve in the flow hole, thereby causing the liquid at the opening of the flow hole to flow inward.

[0022] In the initial state, a gap is set between the piston seat and the piston sleeve to facilitate the flow of glaze in the flow hole during the glazing operation. After the liquid extraction pipe is vented, the airflow pushes the movable sleeve to move, causing the piston seat to abut against the end face of the piston sleeve and close the piston sleeve. The piston seat moves against the piston sleeve in the flow hole, thereby causing the liquid at the opening of the flow hole to flow inward.

[0023] Preferably, a piston chamber is provided on the cleaning connector, the movable sleeve is adapted to the piston chamber, a return spring is installed between one end of the piston chamber and the movable sleeve, and the other end of the piston chamber is connected to the liquid extraction gas pipe.

[0024] After the airflow enters the piston chamber, the air pressure inside the piston chamber increases, which in turn drives the movable sleeve to move.

[0025] Preferably, the cleaning connector is provided with an installation groove, and a piston head is provided at the end of the valve plate. The piston head is adapted to the installation groove and connected. A retaining spring is installed between the piston head and the installation groove. The air blowing channel runs through both ends of the valve plate. A plunger is installed in the air blowing channel. A pre-tightening spring is connected between one end of the plunger and the air blowing channel. The other end of the plunger extends out of the end of the valve plate. A venting groove is provided on the outer wall of the plunger. An air outlet is provided on the end face of the valve plate and communicates with the venting groove. An expansion groove is provided on the inner wall of the air blowing channel. The plunger is pushed inward to make the venting groove connect between the expansion groove and the air outlet.

[0026] The airflow in the clearing tube enters the blowing channel, thereby pushing the valve plate to move into the flow hole. When the valve plate is pushed into place, it closes the flow hole near the opening position. At this time, the plunger is pushed, thereby connecting the ventilation groove between the expansion groove and the air outlet. The airflow in the blowing channel is discharged from the air outlet and blown into the flow hole.

[0027] Preferably, a pressure relief hole is provided on the turntable, which is offset from the jet through hole. The liquid extraction hole and the cleaning hole are respectively connected to the pressure relief groove. The pressure relief groove is set on the end face of the switching seat. As the turntable rotates, the pressure relief hole can connect with the pressure relief groove.

[0028] The pressure relief hole facilitates the pressure relief of the liquid extraction and cleaning vents, thereby facilitating the return of the piston assembly and the valve plate.

[0029] Compared with the prior art, the beneficial effects of the present invention are: (1) the 3D printer glazing print head can automatically realize glazing operation, which can reduce labor intensity, improve work efficiency and product quality; (2) the discharge tube is automatically cleaned to avoid blockage; (3) it can prevent the glaze from flowing out from the opening end of the flow hole and dripping onto the ceramic product due to inertia when glazing stops, thus affecting the glazing effect. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a cross-sectional view of the jet nozzle connection of the present invention;

[0032] Figure 3 This is a schematic diagram of the cleaning connector structure according to Embodiment 2 of the present invention;

[0033] Figure 4 This is a schematic diagram of the end face of the switching seat in Embodiment 2 of the present invention;

[0034] Figure 5 This is a schematic diagram of the turntable structure of Embodiment 2 of the present invention;

[0035] In the diagram: 1. Glazing body, 2. Air nozzle, 3. Storage tank, 4. Discharge pipe, 5. High-pressure air pipe, 6. Positioning pin, 7. Connecting screw, 8. Motor, 9. Turntable, 10. Annular cavity, 11. Air jet through hole, 12. Annular groove, 13. Air inlet connector, 14. Switching seat, 15. Air jet hole, 16. Positioning seat, 17. Drive shaft, 18. Sealing plug, 19. Float ball, 20. Plug, 21. Positioning rod, 22. Cleaning connector, 23. Flow hole, 24. Movable sleeve, 25. Valve plate, 26. Air blowing channel, 27. Liquid extraction air hole, 2 8. Cleaning vent, 29. Liquid extraction pipe, 30. Cleaning pipe, 31. Piston sleeve, 32. Piston seat, 33. Positioning spring, 34. Positioning block, 35. Sealing gasket, 36. Piston chamber, 37. Return spring, 38. Clearance groove, 39. Push rod, 40. Mounting groove, 41. Piston head, 42. Abutment spring, 43. Plunger, 44. Preload spring, 45. Positioning sleeve, 46. Vent groove, 47. Air outlet, 48. Expansion groove, 49. Pressure relief hole, 50. Purge vent, 51. End cap, 52. Positioning ring, 53. Pressure relief groove. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0037] Example 1: A 3D printer enamel spray printhead (see attached) Figure 1 Appendix Figure 2 ),include:

[0038] Storage bin 3 is used to load glaze;

[0039] The glazing body 1 is used to connect with a 3D printer. The 3D printer is existing technology. The 3D glazing operation can be realized simply by installing the glaze printhead of this application onto the 3D printer.

[0040] The nozzle 2 is installed on the glazing body to spray high-pressure airflow. The nozzle is connected to the high-pressure air pipe 5.

[0041] The discharge pipe 4 is connected at one end to the bottom of the storage box, and the other end is set near the opening of the air jet nozzle;

[0042] The jet nozzle ejects a high-pressure airflow, creating a negative pressure at the opening of the discharge pipe. This causes the discharge pipe to draw glaze from the storage tank and discharge it from the opening. The high-pressure airflow then blows the discharged glaze onto the surface of the ceramic product.

[0043] A positioning post 6 is provided at the upper end of the glazing body, and several connecting screws 7 are arranged at intervals along the circumference of the positioning post on the glazing body. In this embodiment, three connecting screws are evenly distributed. During the process of installing the glazing body onto the 3D printer, the positioning post plays a good positioning role, and the connecting screws facilitate the connection and fastening between the glazing body and the 3D printer.

[0044] A turntable 9, driven by a stepper motor 8, is installed inside the glazing body for precise control of the rotation angle. An annular cavity 10 is formed between the outer wall of the turntable and the inner wall of the glazing body. An air jet hole 11 communicating with the annular cavity is located on the end face of the turntable. An annular groove 12 is formed on the outer wall of the turntable, creating an annular cavity between the groove and the inner wall of the glazing body. An air inlet connector 13 is installed on the glazing body, connected to a high-pressure air pipe. The air inlet connector communicates with the annular cavity. A switching seat 14 is installed inside the glazing body, located at the bottom. The end face of the turntable is sealed to the switching seat. An air jet hole 15 communicating with the air jet nozzle is located on the switching seat. Rotation of the turntable causes the air jet hole and air jet hole to engage and disengage, thus cutting off and connecting the airflow. A positioning seat 16 is installed inside the glazing body, fitting snugly against the turntable for positioning. A motor is mounted on the positioning seat, and a drive shaft 17 connects the motor output shaft to the turntable. The air jet nozzle's inner radial opening gradually converges. The storage tank has a maximum level mark on its side wall, which is lower than the opening of the discharge pipe near the nozzle. A sealing plug 18 is located at the bottom of the storage tank and corresponding to the discharge pipe. The sealing plug is connected to a float 19 via a pull rope. When the liquid level in the storage tank is higher than the maximum level, the float rises, pulling the sealing plug upwards and sealing the discharge pipe. The discharge pipe, located at the end of the storage tank, has a frustum-shaped structure, smaller at the top and larger at the bottom. The sealing plug has a plug 20, also smaller at the top and larger at the bottom, which can be inserted into the opening of the discharge pipe to seal it. The sealing plug at the bottom of the storage tank facilitates the installation of several positioning rods 21, with the sealing plug positioned within the circle formed by the positioning rods. The storage tank and the glazing body are separate, and the portion of the discharge pipe near the nozzle is angled towards the outlet.

[0045] The glazing body of the 3D printer's glazing printhead is mounted on an existing 3D printer, enabling spatial movement and thus 3D glazing operations. During operation, high-pressure airflow is ejected from the nozzle, creating a negative pressure at the outlet pipe opening. This causes the outlet pipe to draw glaze material from the storage tank and discharge it through the outlet pipe opening. The high-pressure airflow then blows the discharged glaze material onto the surface of the ceramic product, achieving the glazing operation. This 3D printer glazing printhead of the present application can automatically perform the glazing operation, reducing labor intensity and improving work efficiency and product quality.

[0046] Example 2: A 3D printer enamel spray printhead (see attached) Figure 3 Appendix Figure 4 Appendix Figure 5Its structure is similar to that of Embodiment 1, with the main difference being that a cleaning connector 22 is provided at the end of the discharge pipe in this embodiment. A flow passage hole 23 is provided on the cleaning connector, which is inclined towards the opening end of the jet nozzle. A movable sleeve 24 and a valve plate 25 driven by airflow are installed on the cleaning connector. A piston assembly is installed between the movable sleeve and the flow passage hole. An air blowing channel 26 is provided on the valve plate. A liquid extraction air hole 27 and a cleaning air hole 28 are provided circumferentially at intervals on the switching seat. A liquid extraction air pipe 29 is connected between the liquid extraction air hole and the cleaning connector, and a cleaning air pipe 30 is connected between the cleaning air hole and the cleaning connector. When the liquid extraction air pipe is vented, it pushes the movable sleeve to move, thereby causing the piston assembly to move inward, and the liquid at the opening end of the flow passage hole flows inward. When the cleaning air pipe is vented, it pushes the valve plate to move and close the opening position of the flow passage hole, and blows air into the discharge pipe through the air blowing channel to clean it.

[0047] The piston assembly includes a piston sleeve 31, a piston seat 32, and a positioning spring 33. The piston sleeve has a T-shaped structure, and a positioning block 34 is connected to the inner wall of the flow hole. The piston sleeve abuts against the positioning spring and the positioning block. A sealing gasket 35 is provided on the end face of the piston seat. The piston seat is connected to the movable sleeve. The movable sleeve moves to make the piston seat abut against the end face of the piston sleeve and close the piston sleeve. The piston seat moves against the piston sleeve in the flow hole, thereby causing the liquid at the opening of the flow hole to flow inward. A piston chamber 36 is provided on the cleaning connector. The movable sleeve is adapted to the piston chamber. A return spring 37 is installed between one end of the piston chamber and the movable sleeve. The other end of the piston chamber is connected to the liquid extraction pipe. A clearance groove 38 is provided on the side wall of the flow hole at a position corresponding to the movable sleeve. A push rod 39 is connected between the piston seat and the movable sleeve, and the push rod passes through the clearance groove.

[0048] A mounting groove 40 is provided on the cleaning connector, and a piston head 41 is provided at the end of the valve plate. The piston head is adapted to the mounting groove and connected to it. An end cap 51 is connected to the end of the mounting groove, and the cleaning air pipe is connected to the end cap and communicates with the mounting groove. A retaining spring 42 is installed between the piston head and the mounting groove. The piston head abuts against the end cap. The air passage runs through both ends of the valve plate, and a plunger 43 is installed inside the air passage. A pre-tightening spring 44 is connected between one end of the plunger and the air passage, and the other end of the plunger extends out of the end of the valve plate. A positioning ring 52 is connected to the end of the valve plate. A stepped surface is provided near the end of the plunger, and the stepped surface abuts against the positioning ring to position the plunger. A positioning sleeve 45 is installed inside the air passage, and the pre-tightening spring abuts between the end of the positioning sleeve and the end of the plunger. A venting groove 46 is provided on the outer wall of the plunger, and an air outlet 47 is provided on the end face of the valve plate, which communicates with the venting groove. An expansion groove 48 is provided on the inner wall of the air blowing channel, which is placed between the positioning sleeve and the plunger. The plunger pushes inward to connect the venting groove between the expansion groove and the air outlet. A pressure relief hole 49 is provided on the turntable, which is offset from the jet through hole. A purge air hole 50 is provided on the switching seat, which communicates with the cleaning air pipe. The purge air hole, liquid extraction air hole, and cleaning air hole are respectively connected to the pressure relief groove 53, which is located on the end face of the switching seat. As the turntable rotates, the pressure relief hole can communicate with the pressure relief groove. The jet air hole, liquid extraction air hole, cleaning air hole, and purge air hole are arranged sequentially along the circumference. Before glazing, during the rotation of the turntable, the air jet orifice first connects with the purging air orifice. At this time, the airflow enters the cleaning air pipe, pushes the valve plate to move and close the opening of the flow orifice, and blows air into the discharge pipe through the air channel to clean it, preventing residual glaze from clogging the discharge pipe. The distance between the air jet orifice and the liquid extraction orifice, as well as the distance between the liquid extraction orifice and the cleaning air orifice, are all smaller than the diameter of the air jet orifice. The distance between the cleaning air orifice and the purging air orifice, as well as the distance between the purging air orifice and the air jet orifice, are all larger than the diameter of the air jet orifice. Other structures are the same as in Example 1.

[0049] During glazing operation, the air jet orifice on the turntable is connected to the spray air port on the switching seat. After glazing is completed, the turntable rotates, separating the air jet orifice from the spray air port. Before they are completely separated, the air jet orifice connects to the liquid extraction air port. At this time, airflow enters the liquid extraction air pipe, pushing the movable sleeve to move, thereby moving the piston assembly inward, and the liquid flows inward at the opening of the flow hole. This prevents the glaze from dripping from the opening of the flow hole onto the ceramic product due to inertia at the moment of stopping glazing, thus affecting the glazing effect. The turntable continues to rotate, allowing airflow to enter the cleaning air pipe. The airflow pushes the valve plate to move and close the opening of the flow hole, and blows air into the discharge pipe through the air channel to clean it, sending the residual glaze in the discharge pipe to the storage tank. At the same time, it blows the inner wall of the discharge pipe to prevent residual glaze from clogging the discharge pipe.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A 3D printer enamel spray printhead, characterized in that, include: Storage bins, used to hold glaze materials; The glazing body is used to connect to the 3D printer; The jet nozzle is mounted on the glazing body and is used to spray high-pressure airflow. The discharge pipe is connected to the storage box at one end and the other end is set near the opening of the air nozzle. The jet nozzle ejects a high-pressure airflow, creating a negative pressure at the opening of the discharge pipe. This causes the discharge pipe to draw glaze from the storage tank and discharge it through the opening. The high-pressure airflow then blows the discharged glaze onto the surface of the ceramic product. A motor-driven turntable is installed inside the glazing sprayer body. An annular cavity is formed between the outer wall of the turntable and the inner wall of the sprayer body. An air jet hole communicating with the annular cavity is located on the end face of the turntable. An air inlet connector is installed on the sprayer body, communicating with the annular cavity. A switching seat is installed inside the sprayer body, with the end face of the turntable sealing against it. The switching seat has a jet nozzle communicating with the jet nozzle. Rotation of the turntable engages and disengages the jet nozzle and the jet nozzle, thus achieving airflow. The system includes a cutting-off and connection mechanism; a cleaning connector is installed at the end of the discharge pipe, with a flow passage hole on the cleaning connector. A movable sleeve and valve plate driven by airflow are installed on the cleaning connector, and a piston assembly is installed between the movable sleeve and the flow passage hole. An air blowing channel is provided on the valve plate; a liquid extraction air hole and a cleaning air hole are circumferentially spaced on the switching seat, with a liquid extraction air pipe connected between the liquid extraction air hole and the cleaning connector, and a cleaning air pipe connected between the cleaning air hole and the cleaning connector; air is introduced through the liquid extraction air pipe to push the movable sleeve to move, thereby moving the piston assembly inward, and the liquid flows inward at the opening end of the flow passage hole; air is introduced through the cleaning air pipe to push the valve plate to move and close the opening position of the flow passage hole, and air is blown into the discharge pipe through the air blowing channel for cleaning.

2. The 3D printer enamel spraying printhead according to claim 1, characterized in that, A positioning seat is installed inside the glazing body, and the positioning seat fits into the turntable to achieve the positioning of the turntable.

3. The 3D printer enamel spraying printhead according to claim 1, characterized in that, The bottom of the storage tank and the discharge pipe are equipped with sealing plugs. The sealing plugs are connected to the float by a pull rope. When the liquid level in the storage tank is higher than the highest level, the float rises and pulls the sealing plugs upward to cover the discharge pipe.

4. The 3D printer enamel spraying printhead according to claim 1, characterized in that, The radial direction of the nozzle opening gradually converges.

5. A 3D printer enamel spraying printhead according to claim 1, characterized in that, The piston assembly includes a piston sleeve, a piston seat, and a positioning spring. A positioning block is connected to the inner wall of the flow passage. The piston sleeve abuts against the positioning spring and the positioning block. The piston seat is connected to the movable sleeve. The movable sleeve moves to make the piston seat abut against the end face of the piston sleeve and close the piston sleeve. The piston seat moves against the piston sleeve in the flow passage, thereby causing the liquid at the opening of the flow passage to flow inward.

6. A 3D printer enamel spraying printhead according to claim 1, characterized in that, A piston chamber is provided on the cleaning connector, and the movable sleeve is adapted to connect with the piston chamber. A return spring is installed between one end of the piston chamber and the movable sleeve, and the other end of the piston chamber is connected to the liquid extraction gas pipe.

7. A 3D printer enamel spraying printhead according to claim 1, 5, or 6, characterized in that, The cleaning connector has an installation groove, and the valve plate has a piston head at the end. The piston head is adapted to the installation groove. A retaining spring is installed between the piston head and the installation groove. The air passage runs through both ends of the valve plate. A plunger is installed in the air passage. A pre-tightening spring is connected between one end of the plunger and the air passage. The other end of the plunger extends out of the valve plate end. A venting groove is provided on the outer wall of the plunger. An air outlet is provided on the end face of the valve plate. The air outlet communicates with the venting groove. An expansion groove is provided on the inner wall of the air passage. The plunger is pushed inward to connect the venting groove between the expansion groove and the air outlet.

8. A 3D printer enamel spraying printhead according to claim 1, 5, or 6, characterized in that, The turntable is equipped with a pressure relief hole, which is offset from the jet through hole. The liquid extraction hole and the cleaning hole are respectively connected to the pressure relief groove. The pressure relief groove is located on the end face of the switching seat. As the turntable rotates, the pressure relief hole can connect with the pressure relief groove.

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