Jet printing nozzle
By introducing piezoelectric valves and electric field forming devices into the jet printing nozzle, the high cost problem of high precision and high resolution in the existing jet printing technology is solved, and the applicable occasions are expanded.
Patent Information
- Application Number
- CN202421062584.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-15
AI Technical Summary
When existing printing technology requires high accuracy and resolution, the nozzle aperture needs to be small, resulting in high cost; while electrostatic printing has limited applicability to certain surfaces such as wood.
A printing nozzle including a piezoelectric valve, an insulating block and an electrode piece is designed. The piezoelectric valve is used to control the extrusion amount of liquid, and an electric field is formed between the electrode piece and the valve seat, so that the liquid beads form a Taylor cone. Reduce the diameter of droplets or filaments and improve printing accuracy and resolution.
A high -precision and high -resolution jet are implemented, reducing the requirements and costs of the nozzle diameter, and expanding the applicable occasions of printing.
Smart Images
Figure CN222387833U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of inkjet printing, in particular to an inkjet printing nozzle. Background Art
[0002] Printing refers to spraying or printing liquid onto the surface of an object. In the prior art, one printing method is to directly spray liquid onto the surface of an object through a nozzle. However, the accuracy and resolution of printing are directly related to the size of the nozzle aperture. When a higher resolution is required, the nozzle aperture needs to be smaller, which is difficult to process and has a high cost. Another printing method is electrostatic printing. The existing method generates an electric field between the nozzle and the printed object. Under the action of the electric field, the liquid forms a Taylor cone at the position of the nozzle. Since the tip diameter of the Taylor cone is small, droplets or filaments with smaller diameters can be formed and deposited on the surface of the object. However, for some objects such as wood, their surfaces are not easy to form an electric field with the nozzle, so the applicable occasions of the existing electrostatic printing are somewhat limited. Utility Model Content
[0003] The main purpose of the utility model is to provide a printing nozzle, aiming to solve the technical problems in the prior art that if high printing accuracy is required, the nozzle aperture required is small, the nozzle cost is high, and the existing electrostatic printing is applicable to fewer occasions.
[0004] To achieve the above object, the utility model provides a printing nozzle, comprising:
[0005] A piezoelectric valve comprises a valve body and a valve seat, wherein a flow channel is provided on the inner side of the valve seat, a feed port and a discharge port connected to the flow channel are provided on the valve seat, and a valve core is provided on the inner side of the valve body that can move up and down to open and close the discharge port and squeeze out the liquid;
[0006] An insulating block, which is fixedly connected to the lower side of the valve seat, and the insulating block is provided with a first through hole which passes through from top to bottom, and the first through hole is directly opposite to the discharge port;
[0007] The electrode member is connected to the lower side of the insulating block, the electrode member and the piezoelectric valve are insulated from each other, and the electrode member is provided with an electrode inner hole which passes through from top to bottom, and the electrode inner hole is directly opposite to the first through hole.
[0008] The liquid enters the flow channel from the feed port of the valve seat. During operation, the valve body controls the up and down movement of the valve core. When the valve core moves downward, the liquid can be squeezed out of the discharge port and the amount of liquid squeezed out can be controlled. When the liquid is squeezed out of the discharge port, liquid beads are attached to the discharge port, or the discharge port is connected to a needle, and liquid beads are attached to the needle port after being squeezed out of the needle. At this time, the electrode component is connected to electricity. Since the electrode component is insulated from the valve seat by the insulating block, an electric field is formed between the electrode component, the valve seat and the liquid beads, so the liquid beads form a Taylor cone. The tip diameter of the Taylor cone is small, and tiny droplets or filaments are formed under the action of the electric field, which pass through the electrode inner hole of the electrode component and are sprayed downward onto the surface of the object.
[0009] In the printing nozzle, a piezoelectric valve is used to control the extrusion amount of liquid, and an electric field is formed between the electrode and the valve seat, so that the extruded liquid droplets form a Taylor cone, which can reduce the diameter of the droplets or filaments, thereby improving the accuracy and resolution of the printing, reducing the requirements and cost for the nozzle aperture, and does not rely on the formation of an electric field between the nozzle and the object, making it more applicable in a wider range of occasions.
[0010] Preferably, the printing head further comprises an adjustment seat, the adjustment seat is movably connected to the insulating block, the adjustment seat can be adjusted up and down relative to the insulating block, and the electrode member is fixed on the adjustment seat.
[0011] The electrode piece is fixed on the adjustment seat, and the adjustment seat can be adjusted up and down, that is, the relative height between the electrode piece and the nozzle can be adjusted, and the shape of the droplets or filaments generated by the Taylor cone can be changed to meet different printing requirements.
[0012] Preferably, an adjustment column is provided on the upper side of the adjustment seat, the adjustment column is inserted into the first through hole and threadedly connected to the first through hole, the adjustment seat is provided with a second through hole that passes through from top to bottom, the second through hole is opposite to the first through hole, the electrode member is fixed on the lower side of the adjustment seat, and the axes of the discharge port, the first through hole, the second through hole and the electrode inner hole are coaxially arranged.
[0013] The adjusting column of the adjusting seat is threadedly connected to the first through hole of the insulating block, that is, the upper and lower positions of the adjusting seat and the electrode member can be adjusted by rotating the adjusting seat, and the adjustment accuracy is high; the electrode member remains coaxial with the discharge port during the rotation process, that is, the electric field at the liquid droplet remains evenly distributed when the electrode member is rotated to different angles, so as not to affect the printing quality.
[0014] Preferably, a mounting groove is provided on the lower side of the adjustment seat, the electrode member is fixedly connected in the mounting groove, an electrical connection screw hole is provided on the adjustment seat, the electrical connection screw hole extends along the radial direction of the electrode member, the electrical connection screw hole is connected to the mounting groove, an electrical connection screw is threadedly connected to the electrical connection screw hole, and the end of the electrical connection screw abuts against the side wall of the electrode member.
[0015] Preferably, the printing head also includes an insulation block, which is fixedly connected to the valve seat, an insulation groove is provided on the upper side of the insulation block, a third through hole is provided on the lower side of the insulation groove, the valve seat is arranged in the insulation groove, the discharge port is arranged in the third through hole, and the insulation block is fixedly connected to the lower side of the insulation block.
[0016] The valve seat is arranged in the insulation groove of the insulation block, and the insulation block can insulate the valve seat and the liquid, so that the liquid is kept at a suitable use temperature for printing.
[0017] Preferably, the heat preservation block is provided with a heating element for heating, and the heat preservation block is also provided with a temperature detection element for detecting the temperature. Different printing materials have different use temperatures, the temperature detection element detects the temperature of the valve seat and the liquid, and the heating element can heat the valve seat and the liquid to maintain a suitable temperature, thereby improving the applicability of the nozzle to different printing materials.
[0018] Preferably, the insulation block is provided with a partition slit running through from top to bottom, the partition slit is arranged on the lower side of the insulation tank, one end of the partition slit is open, and the other end of the partition slit is closed, and the insulation block is also provided with relatively arranged mounting holes and mounting screw holes, the mounting holes and the mounting screw holes are respectively arranged on both sides of the partition slit, the mounting holes and the mounting screw holes are connected with mounting screws and enable the insulation tank to clamp the valve seat.
[0019] During assembly, place the valve seat into the insulation groove, then pass the mounting screws through the mounting holes and mounting screw holes and tighten them, so that the insulation block can clamp the valve seat on both sides of the separation seam.
[0020] Preferably, the discharge port is connected to a needle, and the lower end of the needle is higher than the electrode member.
[0021] Preferably, the discharge port is provided with a Luer connector, and the needle is connected to the discharge port via the Luer connector. The Luer connector can conveniently replace needles of different diameters to adapt to different production conditions and requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0023] Figure 1 It is a structural schematic diagram of the utility model;
[0024] Figure 2It is a structural schematic diagram of the lower side of the utility model;
[0025] Figure 3 It is a schematic diagram of the exploded structure of the utility model;
[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the heat preservation block, the insulating block, the adjustment seat and the electrode member of the utility model, and a schematic diagram of the lower end of the needle forming a Taylor cone and a droplet;
[0027] Figure 5 It is a structural schematic diagram of the adjustment seat of the utility model;
[0028] Figure 6 It is a structural schematic diagram of the lower side of the adjustment seat of the utility model;
[0029] Figure 7 It is a structural schematic diagram of the thermal insulation block of the utility model.
[0030] In the accompanying drawings: 1- piezoelectric valve, 11- valve body, 12- valve seat, 122- feed port, 123- discharge port, 13- barrel, 2- insulating block, 21- first through hole, 3- electrode member, 31- electrode inner hole, 4- adjusting seat, 41- adjusting column, 42- second through hole, 43- mounting groove, 44- power connection screw hole, 5- insulation block, 51- insulation groove, 52- third through hole, 53- heating element, 54- temperature detection element, 55- partition gap, 56- mounting hole, 57- mounting screw hole, 6- needle, 71- Taylor cone, 72- droplet.
[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0033] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of technical personnel in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0035] like Figures 1 to 7 As shown, a printing head includes a piezoelectric valve 1, an insulating block 2 and an electrode member 3.
[0036] The piezoelectric valve 1 includes a valve body 11 and a valve seat 12. A flow channel is provided on the inner side of the valve seat 12. A feed port 122 and a discharge port 123 connected to the flow channel are provided on the valve seat 12. Printing materials can be stored in a barrel 13. The barrel 13 is connected to the feed port 122. Liquid enters the flow channel under the action of gravity and / or air pressure. A valve core is provided on the inner side of the valve body 11, which can move up and down to open and close the discharge port 123 and squeeze out the liquid. The valve core is located on the upper side of the discharge port 123. When the valve core moves upward, the liquid enters the discharge port 123. When the valve core moves downward, the liquid is squeezed out of the discharge port 123. Piezoelectric valve 1 is an existing control valve made by using the principle that functional ceramic sheets produce bending deformation under the action of voltage. Piezoelectric valve 1 realizes precise control of flow rate by controlling the flow of fluid. When voltage is applied to the piezoelectric material, it will cause the material to deform. This deformation is used to form the movement of the valve core to control the flow of fluid. Piezoelectric valve 1 has the advantages of high precision, fast response, and small size. It can also reduce liquid blockage and make the printing work more stable and smooth. The internal structure of piezoelectric valve 1 will not be described in detail here.
[0037] The insulating block 2 is fixedly connected to the lower side of the valve seat 12 . The insulating block 2 is made of insulating material. A first through hole 21 penetrating vertically is provided on the insulating block 2 . The first through hole 21 is directly opposite to the discharge port 123 .
[0038] The electrode member 3 is connected to the lower side of the insulating block 2. The electrode member 3 and the piezoelectric valve 1 are insulated from each other. The electrode member 3 is provided with an electrode inner hole 31 which passes through from top to bottom. The electrode inner hole 31 is directly opposite to the first through hole 21. The electrode member 3 is connected to the high voltage electrode.
[0039] The liquid enters the flow channel from the feed port 122 of the valve seat 12. During operation, the valve body 11 controls the valve core to move up and down. When the valve core moves downward, the liquid can be squeezed out of the discharge port 123 and the amount of liquid squeezed out can be controlled. When the liquid is squeezed out of the discharge port 123, a liquid droplet is attached to the discharge port 123, or the discharge port 123 is connected to the needle 6, and a liquid droplet is attached to the needle port after the liquid is squeezed out of the needle 6. During operation, the size of the liquid droplet is basically maintained by the control of the piezoelectric valve 1. At this time, the electrode member 3 is connected to high voltage, and the valve seat 12 can be grounded. Since the electrode member 3 is insulated from the valve seat 12 by the insulating block 2, a ring-shaped electric field is formed between the electrode member 3, the valve seat 12 and the liquid droplet, so the liquid droplet forms a Taylor cone 71, referring to Figure 4 The tip diameter of the Taylor cone 71 is relatively small, and under the action of the electric field, tiny droplets 72 or filaments are formed, which pass through the electrode inner hole 31 of the electrode member 3 and are sprayed downward onto the surface of the object. The sprayed liquid has no effect on the electric field.
[0040] In the present printing nozzle, the amount of liquid extruded is controlled by a piezoelectric valve 1, and an electric field is formed between the electrode member 3 and the valve seat 12, so that the extruded liquid droplets form a Taylor cone 71, which can reduce the diameter of the droplets 72 or filaments, thereby improving the accuracy and resolution of the printing, reducing the requirements and cost for the nozzle aperture, and not relying on the formation of an electric field between the nozzle and the object, making it more applicable in a wider range of occasions.
[0041] In some specific embodiments, referring to Figures 4 to 6 The printing head also includes an adjustment seat 4, which is movably connected to the insulating block 2. The adjustment seat 4 can be adjusted up and down relative to the insulating block 2, and the electrode member 3 is fixed on the adjustment seat 4.
[0042] The electrode member 3 is fixed on the adjustment seat 4, and the adjustment seat 4 can be adjusted up and down, that is, the relative height between the electrode member 3 and the nozzle can be adjusted, and the Taylor cone 71 can be changed to generate droplets 72, mist or filaments to meet different printing requirements. The printing form can also be changed by adjusting the voltage of the electrode member 3. Preferably, the adjustment seat 4 is made of insulating material to improve the insulation between the electrode member 3 and the valve seat 12.
[0043] Furthermore, an adjusting column 41 is provided on the upper side of the adjusting seat 4, the adjusting column 41 is inserted into the first through hole 21 and is threadedly connected to the first through hole 21, and a second through hole 42 is provided on the adjusting seat 4 which passes through the adjusting column 41, and the second through hole 42 is opposite to the first through hole 21, and the electrode member 3 is fixed to the lower side of the adjusting seat 4, and the axes of the discharge port 123, the first through hole 21, the second through hole 42 and the electrode inner hole 31 are coaxially arranged.
[0044] The adjustment column 41 of the adjustment seat 4 is threadedly connected to the first through hole 21 of the insulating block 2, that is, the adjustment seat 4 can be rotated to adjust the upper and lower positions of the adjustment seat 4 and the electrode member 3, and the adjustment accuracy is high; the electrode member 3 remains coaxial with the discharge port 123 during the rotation process, that is, the electric field at the liquid droplet remains uniformly distributed when the electrode member 3 rotates to different angles, so as not to affect the printing quality. In other embodiments, the adjustment seat 4 can also have a long hole extending in the up and down direction, through which a screw passes through the long hole and is connected to the insulating seat, and the upper and lower positions of the adjustment seat 4 can also be adjusted when the screw is loosened.
[0045] Furthermore, a mounting groove 43 is provided on the lower side of the adjustment seat 4, and the electrode member 3 is fixedly connected in the mounting groove 43. An electrical connection screw hole 44 is provided on the adjustment seat 4, and the electrical connection screw hole 44 extends along the radial direction of the electrode member 3. The electrical connection screw hole 44 is connected to the mounting groove 43, and an electrical connection screw is threadedly connected to the electrical connection screw hole 44, and the end of the electrical connection screw abuts against the side wall of the electrode member 3. The electrode member 3 can be fixed in the mounting groove 43 by screws.
[0046] The electrode member 3 is installed in the installation slot 43 of the adjustment seat 4, which can reduce the possibility of touching the electrode member 3. The wires of the electric field generating device can be connected to the power screws, and the power screws abut against the side wall of the electrode member 3 to realize the power connection of the electrode member 3. The connection is relatively simple, and the influence of the wires on the printing is reduced. In other embodiments, the wires of the electric field generating device can also be connected to the lower side of the electrode member 3.
[0047] In some specific embodiments, referring to Figure 7 The printing head also includes an insulation block 5, which is fixedly connected to the valve seat 12. An insulation groove 51 is provided on the upper side of the insulation block 5, and a third through hole 52 is provided on the lower side of the insulation groove 51. The valve seat 12 is arranged in the insulation groove 51, and the discharge port 123 is arranged in the third through hole 52. The insulating block 2 is fixedly connected to the lower side of the insulation block 5.
[0048] The valve seat 12 is arranged in the insulation groove 51 of the insulation block 5, and the insulation block 5 can insulate the valve seat 12 and the liquid, so that the liquid is kept at a suitable use temperature for printing. The insulation block 2 can be fixed to the lower side of the insulation block 5 by screws.
[0049] Furthermore, a heating element 53 for heating is provided on the heat preservation block 5, and a temperature detection element 54 for detecting temperature is also provided on the heat preservation block 5. Different printing materials have different use temperatures, the temperature detection element 54 detects the temperature of the valve seat 12 and the liquid, and the heating element 53 can heat the valve seat 12 and the liquid to maintain a suitable temperature, thereby improving the applicability of the nozzle to different printing materials.
[0050] In some specific embodiments, a partition slit 55 extending from top to bottom is provided on the insulation block 5, and the partition slit 55 is provided on the lower side of the insulation tank 51, one end of the partition slit 55 is open, and the other end of the partition slit 55 is closed. The insulation block 5 is also provided with relatively arranged mounting holes 56 and mounting screw holes 57, and the mounting holes 56 and mounting screw holes 57 are respectively arranged on both sides of the partition slit 55, and the mounting holes 56 and mounting screw holes 57 are connected with mounting screws so that the insulation tank 51 clamps the valve seat 12.
[0051] During assembly, the valve seat 12 is placed in the insulation tank 51 , and then the mounting screws are passed through the mounting holes 56 and the mounting screw holes 57 and tightened, so that the insulation block 5 can clamp and fix the valve seat 12 on both sides of the separation gap 55 .
[0052] In some specific embodiments, referring to Figure 4 The discharge port 123 is connected to a needle 6, and the lower end of the needle 6 is higher than the electrode member 3. The discharge port 123 is connected to the needle 6, and the liquid is squeezed out through the needle hole at the lower end of the needle 6. The lower end of the needle 6 is higher than the electrode member 3, so that the liquid droplet forms a Taylor cone 71.
[0053] Further, the discharge port 123 is provided with a Luer connector, and the needle 6 is connected to the discharge port 123 via the Luer connector. The Luer connector can easily replace needles 6 of different diameters, meet different production conditions and requirements, and reduce production or testing costs.
[0054] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A printing nozzle, characterized in that: include: A piezoelectric valve (1), comprising a valve body (11) and a valve seat (12), wherein a flow channel is provided on the inner side of the valve seat (12), an inlet (122) and an outlet (123) which are connected to the flow channel are provided on the valve seat (12), and a valve core which can move up and down to open and close the outlet (123) and squeeze out liquid is provided on the inner side of the valve body (11); An insulating block (2) fixedly connected to the lower side of the valve seat (12), the insulating block (2) being provided with a first through hole (21) extending vertically therethrough, the first through hole (21) being directly opposite to the discharge port (123); An electrode member (3) is connected to the lower side of the insulating block (2); the electrode member (3) and the piezoelectric valve (1) are insulated from each other; the electrode member (3) is provided with an electrode inner hole (31) which passes through the electrode member (3) from top to bottom; the electrode inner hole (31) is opposite to the first through hole (21).
2. The printing head according to claim 1, characterized in that: The printing head further comprises an adjustment seat (4), the adjustment seat (4) being movably connected to the insulating block (2), the adjustment seat (4) being capable of being adjusted up and down relative to the insulating block (2), and the electrode member (3) being fixed on the adjustment seat (4).
3. The printing head according to claim 2, characterized in that: An adjusting column (41) is provided on the upper side of the adjusting seat (4), and the adjusting column (41) is inserted into the first through hole (21) and is threadedly connected to the first through hole (21). A second through hole (42) is provided on the adjusting seat (4) and passes through the adjusting seat from top to bottom, and the second through hole (42) is directly opposite to the first through hole (21). The electrode member (3) is fixed on the lower side of the adjusting seat (4), and the axes of the discharge port (123), the first through hole (21), the second through hole (42) and the electrode inner hole (31) are coaxially arranged.
4. The printing head according to claim 2, characterized in that: The lower side of the adjustment seat (4) is provided with a mounting groove (43), the electrode member (3) is fixedly connected in the mounting groove (43), the adjustment seat (4) is provided with an electrical connection screw hole (44), the electrical connection screw hole (44) extends along the radial direction of the electrode member (3), the electrical connection screw hole (44) is communicated with the mounting groove (43), the electrical connection screw hole (44) is threadedly connected with an electrical connection screw, and the end of the electrical connection screw abuts against the side wall of the electrode member (3).
5. The printing head according to claim 1, characterized in that: The printing head also includes a heat preservation block (5), the heat preservation block (5) is fixedly connected to the valve seat (12), a heat preservation groove (51) is provided on the upper side of the heat preservation block (5), a third through hole (52) is provided on the lower side of the heat preservation groove (51), the valve seat (12) is arranged in the heat preservation groove (51), the discharge port (123) is arranged in the third through hole (52), and the insulating block (2) is fixedly connected to the lower side of the heat preservation block (5).
6. The printing head according to claim 5, characterized in that: The heat-insulating block (5) is provided with a heating element (53) for heating, and the heat-insulating block (5) is also provided with a temperature detection element (54) for detecting temperature.
7. The printing head according to claim 5, characterized in that: The insulation block (5) is provided with a partition slit (55) which passes through from top to bottom. The partition slit (55) is arranged on the lower side of the insulation tank (51). One end of the partition slit (55) is open and the other end of the partition slit (55) is closed. The insulation block (5) is also provided with a mounting hole (56) and a mounting screw hole (57) which are arranged opposite to each other. The mounting hole (56) and the mounting screw hole (57) are respectively arranged on both sides of the partition slit (55). The mounting hole (56) and the mounting screw hole (57) are connected with mounting screws so that the insulation tank (51) clamps the valve seat (12).
8. The printing head according to claim 1, characterized in that: The discharge port (123) is connected to a needle (6), and the lower end of the needle (6) is higher than the electrode member (3).
9. The printing head according to claim 8, characterized in that: The discharge port (123) is provided with a Luer connector, and the needle (6) is connected to the discharge port (123) via the Luer connector.