Electrofluidic electrodynamic printhead, jet printing device and inkjet printing system

Abstract

The application relates to an electrofluidic electric printing head, a jet printing device and an inkjet printing system, comprising a main body part, a liquid inlet hole and a liquid outlet hole being communicated from top to bottom in the main body part; a needle head being detachably connected to the bottom end of the main body part, and the needle head being communicated with the liquid outlet hole; a liquid supply assembly being communicated with the liquid inlet hole; a shielding assembly comprising a shielding driving element and a shielding head, the shielding head comprising multiple shielding sections with different outer diameters, the outer diameters of the multiple shielding sections being connected from top to bottom in sequence, and the outer diameters of the multiple shielding sections being sequentially reduced from top to bottom; the shielding driving element being connected to the main body part, and the shielding driving element driving the shielding head to move up and down, the shielding head being adapted to partially or completely block the liquid outlet hole; a power supply assembly comprising a power supply end, the power supply end being located at the needle head. The application adjusts the amount of functional liquid supplied to the needle body by changing the inlet size of the liquid outlet hole, and adjusts and controls the voltage applied to the needle head in combination with the power supply assembly, so as to adapt to the jetting requirements of the needle head with different needle tip sizes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing technology, and particularly relates to an electrohydrodynamic printing head, a jet printing device and an inkjet printing system. BACKGROUND

[0002] In recent years, inkjet printing devices have been widely used due to their advantages of saving materials, environmental friendliness and simple operation. Traditional inkjet printing technology has the disadvantages of low printing resolution, limited droplet size by nozzle diameter, nozzle clogging and complex nozzle manufacturing process. Compared with traditional inkjet printing technology, electrohydrodynamic inkjet printing technology can produce smaller droplets and liquid filaments with a diameter of nanometers. At the same time, electrohydrodynamic inkjet printing technology can jet print more materials such as high-molecular organic materials, making its application range more extensive, such as flexible electronic manufacturing, ceramic component manufacturing and tissue engineering.

[0003] Electrohydrodynamic jet printing technology applies the mechanism of electrohydrodynamics to pull liquid out of the nozzle opening to form a Taylor cone by using an electric field. Due to the high potential of the nozzle, the liquid at the nozzle is subjected to an electrically induced shear stress. When the local charge force exceeds the surface tension of the liquid, the charged liquid is ejected from the nozzle and then breaks into liquid columns or small droplets. By changing the flow rate, voltage, liquid properties and nozzle structure, different jet shapes and breaking mechanisms of electrohydrodynamic jet printing modes, i.e. electrospinning, electrospraying and electrospray, can be formed.

[0004] In related technologies, an external liquid supply assembly supplies functional liquid into the main body of the printing head. The functional liquid in the main body is sent to the needle, and under the action of the electric field force, the functional liquid in the needle is ejected. The inner diameter of the needle tip of the printing head determines the droplet point diameter printed by the printing head. When printing droplets with different point diameters is needed, the needle with a corresponding needle tip inner diameter is replaced, and the voltage applied to the needle tip of the printing head is adjusted accordingly, so that the adjustment of the printing droplet point diameter can be realized.

[0005] However, since the inner diameter of the main body of the printing head is consistent, and the main body of the printing head is in communication with the needle, the flow direction of the functional liquid in the main body to the needle is consistent, i.e. the rate of supplying the functional liquid into the needle is consistent. When printing droplets with a large point diameter is needed, after replacing the needle with a larger needle tip inner diameter, it is difficult for the functional liquid flowing into the needle to fill the needle, which causes air bubbles in the needle, thereby affecting the printing quality. When printing droplets with a small point diameter is needed, after replacing the needle with a smaller needle tip inner diameter, the needle cannot discharge the functional liquid in time, which easily causes the blockage of the liquid inlet end of the needle, and the pressure in the needle is too large, which causes part of the functional liquid to be ejected along with the electric field force, thereby affecting the printing quality.

[0006] Therefore, the electro-fluidic nozzle in the related art cannot realize high-precision and high-quality printing of different droplet diameters by only replacing the needle, and the electro-fluidic nozzle needs to be replaced in its entirety when droplets with different diameters need to be printed. Therefore, the nozzle in the related art is difficult to print droplets with different diameters and has poor applicability. SUMMARY

[0007] Embodiments of the present application provide an electro-fluidic electric printing head, a printing device and an inkjet printing system to solve the technical problem that the electro-fluidic nozzle in the related art is difficult to print droplets with different diameters with high precision and high quality and has poor applicability.

[0008] In a first aspect, an electro-fluidic electric printing head is provided, comprising:

[0009] a main body portion, the main body portion being internally provided with a liquid inlet hole and a liquid outlet hole in communication from top to bottom;

[0010] a needle, the needle being detachably connected to a bottom end of the main body portion, and the needle being in communication with the liquid outlet hole;

[0011] a liquid supply assembly, the liquid supply assembly being in communication with the liquid inlet hole to supply functional liquid to the liquid inlet hole;

[0012] a shielding assembly, the shielding assembly comprising a shielding driving member and a shielding head, the shielding head comprising a plurality of shielding segments with different outer diameters, the outer diameters of the plurality of shielding segments being sequentially connected from top to bottom, and the outer diameters of the plurality of shielding segments sequentially decreasing from top to bottom; the shielding driving member being connected to the main body portion, and the shielding driving member driving the shielding head to move up and down, the shielding head being adapted to partially or completely block the liquid outlet hole;

[0013] a power supply assembly, the power supply assembly comprising a power supply end, the power supply end being located at the needle.

[0014] In some embodiments, the shielding head is in the shape of a cone or a platform, and the bottom surface area of the shielding head is smaller than the top surface area.

[0015] In some embodiments, the shielding driving member comprises:

[0016] a guide sleeve, the guide sleeve being connected to the top surface of the main body portion, and the guide sleeve being in communication with the main body portion;

[0017] a movable portion, the movable portion being provided in the guide sleeve to move up and down, the movable portion being connected to the shielding head;

[0018] a shielding linear module, the shielding linear module being drivingly connected to the movable portion to drive the sliding portion and the shielding head to move up and down.

[0019] In some embodiments, the shielding assembly further comprises a blocking portion, the blocking portion is connected to the top of the shielding head, and the circumferential outer side of the blocking portion is attached to the hole wall of the liquid inlet hole.

[0020] In some embodiments, the shielding assembly further comprises a shielding rod, the shielding rod is connected to the bottom end of the shielding head, the shielding rod is inserted into the liquid outlet hole, and the outer diameter of the shielding rod is smaller than the hole diameter of the liquid outlet hole.

[0021] In some embodiments, the power supply assembly comprises:

[0022] An insulating plug connected to the driving end of the shielding driving member;

[0023] A conductive rod, two ends of the conductive rod are respectively connected to the shielding head and the insulating plug, and the conductive rod is electrically connected to the shielding head;

[0024] A conductive needle connected to the shielding head, the conductive needle extends into the needle tube of the needle head, and the conductive needle is electrically connected to the shielding head;

[0025] A conductive column, the conductive column is inserted into the main body portion, the conductive column abuts against and is electrically connected to the conductive rod, and the conductive column is electrically connected to an external power supply;

[0026] The main body portion and the needle head are both insulated.

[0027] In some embodiments, the liquid supply assembly comprises:

[0028] A liquid supply pipe in communication with the liquid inlet hole;

[0029] A liquid supply cylinder for storing functional liquid, the liquid supply cylinder is in communication with the liquid supply pipe, and the liquid supply cylinder is in communication with an external gas supply mechanism.

[0030] In some embodiments, the hole diameter of the liquid inlet hole is greater than the hole diameter of the liquid outlet hole, a stepped surface is formed between the liquid inlet hole and the liquid outlet hole, and the stepped surface is arranged with a low middle portion and a high peripheral portion.

[0031] In a second aspect, an electrofluidic electrodynamic printing head is provided.

[0032] In a third aspect, an inkjet printing system is provided, comprising the electrofluidic electrodynamic printing head as described above, and / or the electrofluidic electrodynamic printing head as described above.

[0033] The technical solutions provided by the present application have the following beneficial effects:

[0034] The embodiment of the present application provides an electro-fluidic electric printing head, a jet printing device and an inkjet printing system. The electro-fluidic electric printing head adjusts the amount of functional liquid supplied to the needle body by changing the inlet size of the liquid outlet hole, and adjusts the voltage applied to the needle head by combining the power supply assembly, so as to adapt to the jetting requirements of the needle head with different needle tip sizes.

[0035] Specifically, when printing liquid drops with a smaller point diameter, the needle head with a small needle tip size is replaced, the shielding head is lowered by the shielding drive, the shielding head partially shields the liquid outlet hole, the communication area of the liquid outlet hole and the liquid inlet hole is reduced, the amount of functional liquid entering the needle head after entering the liquid outlet hole is reduced, the amount of liquid supplied by the liquid supply assembly into the liquid inlet hole is reduced, and the voltage applied to the needle head by the power supply assembly is adaptively adjusted, so that the printing of small liquid drops can be realized. Since the amount of functional liquid entering the needle head is reduced, the functional liquid in the needle head can be normally consumed, the functional liquid is not easy to accumulate to cause blockage, and the functional liquid is not easy to be accompanied by ejection, so that the printing quality and precision are ensured.

[0036] When printing liquid drops with a larger point diameter, the needle head with a large needle tip size is replaced, the shielding head is raised by the shielding drive, the shielding degree of the shielding head to the liquid outlet hole is reduced, the communication area of the liquid outlet hole and the liquid inlet hole is expanded, the amount of functional liquid entering the needle head after entering the liquid outlet hole is increased, the amount of liquid supplied by the liquid supply assembly into the liquid inlet hole is increased, and the voltage applied to the needle head by the power supply assembly is adaptively adjusted, so that the printing of large liquid drops can be realized. Since the amount of functional liquid entering the needle head is increased, the demand of the functional liquid amount required by the needle head for jetting is met, bubbles are not easy to be generated in the needle head due to insufficient functional liquid, and the printing quality and precision are ensured.

[0037] Therefore, by changing the communication area of the liquid outlet hole and the liquid inlet hole, and adaptively adjusting the output of the power supply assembly and the liquid supply assembly, the jetting requirements of the needle head with different needle tip sizes are adapted, the printing quality and precision are ensured, and the applicability of the electro-fluidic jet head is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0039] Figure 1 A schematic diagram of the electro-fluidic electric printing head provided by the embodiment of the present application;

[0040] Figure 2 An internal schematic diagram of the electro-fluidic electric printing head provided by the embodiment of the present application;

[0041] Figure 3 A schematic diagram of the shielding head partially shielding the liquid outlet hole is provided for the embodiment of the present application;

[0042] Figure 4 A partial exploded view of the electrohydrodynamic printing head is provided for the embodiment of the present application;

[0043] Figure 5 A schematic diagram of the shielding head composed of multiple shielding segments is provided for the embodiment of the present application;

[0044] Figure 6 A schematic diagram of the power supply assembly is provided for the embodiment of the present application.

[0045] In the figure: 1, main body; 1a, liquid inlet hole; 1b, liquid outlet hole; 1c, stepped surface; 2, needle; 3, liquid supply assembly; 31, liquid supply cylinder; 32, liquid supply pipe; 4, shielding assembly; 41, shielding driving member; 411, guide sleeve; 412, movable part; 413, shielding linear module; 42, shielding head; 42a, shielding segment; 43, blocking part; 44, shielding rod; 5, power supply assembly; 51, insulating plug; 52, conductive rod; 53, conductive needle; 54, conductive column. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] The electrohydrodynamic printing head, the jet printing device and the inkjet printing system provided by the embodiments of the present application adjust the amount of functional liquid supplied to the needle body by changing the inlet size of the liquid outlet hole, and regulate the voltage applied to the needle head in combination with the power supply assembly, so as to adapt to the jetting requirements of needle heads with different needle tip sizes. The embodiments of the present application solve the technical problem that the electrohydrodynamic printing head in the related art is difficult to print liquid droplets with different point diameters with high precision and high quality, and has poor applicability.

[0048] Reference Figure 1 and Figure 2The utility model provides an electrofluidic electric printing head, including main part 1, liquid supply assembly 3, shielding assembly 4 and power supply assembly 5.Needle 2 is detachable in main part 1, and by replacing needle 2 of different needle tip inner diameter, the printing droplet of different size point diameter is realized, wherein, liquid supply assembly 3 is used to supply functional liquid to main part 1, and the functional liquid is flowed to needle 2 by main part 1.Shielding assembly 4 is used to regulate the communication area of main part 1 and needle 2, and the rate of functional liquid into needle 2 is changed to adapt to the functional liquid supply of different needle tip size of nozzle.Power supply assembly 5 applies voltage at needle 2 through power supply end, so that the functional liquid in needle 2 is sprayed by using electric field force.

[0049] Referring to Figure 1 And Figure 2 Specifically, in the embodiment, main part 1 is tubular, and the inside of main part 1 is provided with liquid inlet hole 1a and liquid outlet hole 1b from top to bottom in communication.Liquid supply assembly 3 is in communication with liquid inlet hole 1a, and liquid supply assembly 3 is used to supply functional liquid to liquid inlet hole 1a, and the functional liquid enters liquid outlet hole 1b from liquid inlet hole 1a.

[0050] Referring to Figures 1-4 Needle 2 is detachably installed at the bottom end of main part 1, and needle 2 is in communication with liquid outlet hole 1b, and the functional liquid enters needle 2 from liquid outlet hole 1b, so as to supply functional liquid to needle 2.

[0051] In this way, since needle 2 is detachably connected with main part 1, it is convenient to replace needle 2 with different needle tip inner diameters to meet the printing of droplets with different point diameters.

[0052] Referring to Figures 1-4 Further, needle 2 is threadedly connected or plug-fitted with main part 1, so as to realize the detachable connection of needle 2 with main part 1.Preferably, a sealing ring is arranged at the connection between needle 2 and main part 1, so as to increase the sealing property of the connection between needle 2 and main part 1 and reduce the risk of liquid leakage.

[0053] Referring to Figure 1 And Figure 2 Among them, liquid supply assembly 3 includes liquid supply pipe 32 and liquid supply cylinder 31.Liquid supply pipe 32 is fixed to the side surface of main part 1, and liquid supply pipe 32 is in communication with liquid inlet hole 1a.Liquid supply cylinder 31 is used to store functional liquid, liquid supply cylinder 31 is in communication with liquid supply pipe 32, and liquid supply cylinder 31 is in communication with an external air supply mechanism.

[0054] In this way, the functional liquid in liquid supply cylinder 31 is pushed to liquid supply pipe 32 by using air pressure generated by the air supply mechanism, and the functional liquid is sequentially sent from liquid supply pipe 32 to liquid inlet hole 1a, liquid outlet hole 1b and needle 2.The air pressure is used to realize the functional liquid supply of needle 2.

[0055] It should be noted that the viscosity of the functional liquid is large, and it is difficult to flow by itself, and the flow of the functional liquid can be assisted by air pressure. In addition, since the inner diameter of the needle tip of the needle 2 is usually micron level, the functional liquid cannot be sprayed out of the needle 2 by air pressure alone, and the precise droplet volume cannot be sprayed. Therefore, the air supply mechanism can only send the functional liquid into the needle 2, and cannot spray the functional liquid out of the needle 2.

[0056] Referring to Figure 1 and Figure 2 , preferably, the flow channel of the liquid supply pipe 32 is arranged obliquely to the main body part 1, and the end of the liquid supply pipe 32 communicating with the liquid inlet hole 1a is the lowest point of the flow channel of the liquid supply pipe 32. By obliquely arranging the flow channel of the liquid supply pipe 32, the flow of the functional liquid in the liquid supply pipe 32 is facilitated, the possibility of the functional liquid adhering to the inner wall of the liquid supply pipe 32 is reduced, and the flowability of the functional liquid is improved.

[0057] Referring to Figures 1-4 , wherein the shielding assembly 4 is used to partially or completely shield the communication between the liquid inlet hole 1a and the liquid outlet hole 1b, that is, the shielding assembly 4 is used to partially or completely shield the inlet of the liquid outlet hole 1b, and the communication area between the liquid inlet hole 1a and the liquid outlet hole 1b is controlled.

[0058] In this way, according to the size of the droplet diameter required for printing, the needle 2 with a corresponding needle tip inner diameter is selected. By changing the communication area between the liquid inlet hole 1a and the liquid outlet hole 1b, the rate of the functional liquid entering the needle 2 is adjusted, and the speed of the liquid supply assembly 3 supplying the functional liquid is adjusted synchronously, that is, the liquid supply demand of the needle 2 with different needle tip inner diameters can be adapted, and the applicability of the electrofluidic jet head is improved.

[0059] Referring to Figures 1-4 , specifically, the shielding assembly 4 includes a shielding driving member 41 and a shielding head 42, and the shielding head 42 includes a plurality of shielding segments 42a with different outer diameters. The outer diameters of the plurality of shielding segments 42a are sequentially connected from top to bottom, and in this embodiment, the plurality of shielding segments 42a are integrally formed. Referring to Figure 5 , the outer diameters of the plurality of shielding segments 42a decrease sequentially from top to bottom. Among them, the outer diameters of some shielding segments 42a are smaller than the hole diameter of the liquid outlet hole 1b, and the outer diameters of some shielding segments 42a are larger than the hole diameter of the liquid outlet hole 1b.

[0060] Referring to Figures 1-4 , the shielding driving member 41 is connected to the main body part 1, and the shielding driving member 41 drives the shielding head 42 to move up and down in the liquid inlet hole 1a and the liquid outlet hole 1b, and the shielding head 42 is adapted to partially or completely block the liquid outlet hole 1b.

[0061] In this way, by driving the shielding head 42 to move through the shielding driving member 41, the shielding section 42a with different outer diameters is extended into the liquid outlet hole 1b to shield the liquid outlet hole 1b to different degrees, so that the amount of functional liquid flowing to the needle head 2 can be controlled, different pillow needle heads can be conveniently matched, and the applicability of the electro-fluidic jet head is improved.

[0062] Preferably, the shielding head 42 is in the shape of a cone or a truncated cone, and the bottom surface area of the shielding head 42 is smaller than the top surface area. In this embodiment, the shielding head 42 is in the shape of a truncated cone.

[0063] In this way, the outer diameter of the shielding head 42 decreases steplessly from top to bottom, so that the shielding range of the shielding head 42 to the liquid outlet hole 1b changes steplessly when the shielding head 42 descends, and the shielding area of the liquid outlet hole 1b can be more accurately controlled.

[0064] Referring to Figures 1-4 The shielding driving member 41 includes a guide sleeve 411, a movable part 412, and a shielding linear module 413.

[0065] Referring to Figures 1-4 The guide sleeve 411 is connected to the top surface of the main body part 1 and communicates with the main body part 1. The movable part 412 is arranged to slide up and down in the guide sleeve 411, and the movable part 412 is connected to the shielding head 42. The movable part 412 is in the shape of a long strip or a block, and the circumferential surface of the movable part 412 is attached to the inner wall of the guide sleeve 411 to guide the movement of the movable part 412 through the guide sleeve 411, thereby improving the movement accuracy of the movable part 412. When the movable part 412 moves up and down, the shielding head 42 moves together, so that the up-and-down movement of the shielding head 42 can be realized.

[0066] Referring to Figures 1-4 The shielding linear module 413 is drivingly connected to the movable part 412 to drive the sliding part and the shielding head 42 to move up and down. In this embodiment, the shielding linear module 413 includes a screw rod mechanism. The motor part of the screw rod mechanism is fixed to the top end of the guide sleeve 411, the screw rod part of the screw rod mechanism extends into the guide sleeve 411, and is threadedly connected to the movable part 412.

[0067] Referring to Figures 1-4 Further, the cross section of the inner hole of the guide sleeve 411 is non-circular, and in this embodiment, the cross section of the inner hole of the guide sleeve 411 is in the shape of a racetrack to facilitate processing. In other embodiments, the cross section of the inner hole of the guide sleeve 411 is in the shape of an ellipse, a semicircle, a square, etc. The circumferential outer surface of the movable part 412 is fitted to the shape of the inner wall of the guide sleeve 411.

[0068] In this way, the shape of the cross section of the inner hole of the guide sleeve 411 and the shape of the cross section of the movable part 412 limit the rotation of the movable part 412 relative to the guide sleeve 411, so that the movable part 412 is prevented from rotating relative to the guide sleeve 411.

[0069] In other embodiments, the shielding linear module 413 comprises a linear motor, a belt mechanism, an electric cylinder, etc.

[0070] Further, the guide sleeve 411 and the movable part 412 are both made of metal material, preferably stainless steel material. The guide sleeve 411 is not easy to deform and can limit the movable part 412. In addition, the guide sleeve 411 and the movable part 412 are both more wear-resistant, which ensures the movement accuracy.

[0071] In other embodiments, the shielding driving part 41 comprises a lead screw mechanism, a linear motor or a belt mechanism.

[0072] Referring to Figures 1-4 In this embodiment, the blocking part 43 is in a columnar shape. In this embodiment, the communication position of the liquid supply assembly 3 and the liquid inlet hole 1a is lower than the blocking part 43.

[0073] In this way, the liquid inlet hole 1a is blocked by the blocking part 43, which prevents the functional liquid in the liquid inlet hole 1a from overflowing the main body part 1 and prevents the functional liquid from entering the guide sleeve 411 to cause pollution.

[0074] Referring to Figures 2-4 Further, the circumferential outer side surface of the blocking part 43 is embedded with a plurality of sealing rings, which are arranged along the length direction of the blocking part 43 to improve the sealing performance of the blocking part 43 on the liquid inlet hole 1a by the sealing rings.

[0075] Referring to Figures 2-4 In this embodiment, the shielding rod 44 is partially arranged in the liquid outlet hole 1b in the lifting stroke of the shielding head 42. Preferably, the shielding rod 44 is coaxially arranged with the liquid outlet hole 1b, so that the communication port of the liquid outlet hole 1b and the liquid inlet hole 1a is annularly opened.

[0076] In this way, since the shielding head 42 is arranged in the liquid outlet hole 1b, the area available for the functional liquid to flow through the liquid outlet hole 1b is reduced. On the one hand, the liquid outlet hole 1b does not need to be machined to be small, and the machining size precision does not need to be extremely fine, which facilitates the machining of the liquid outlet hole 1b. On the other hand, the shielding rod 44 plays a role in guiding the functional liquid, so that the functional liquid flows into the needle 2 more stably and uniformly, avoiding the situation that the functional liquid falls freely in the liquid outlet hole 1b, so that the functional liquid in the needle 2 is not easy to produce bubbles, which ensures the printing quality.

[0077] In the embodiment, the shielding head 42, the blocking part 43 and the shielding rod 44 are integrally formed.

[0078] Referring to Figures 2-4 , wherein the hole diameter of the liquid inlet hole 1a is larger than that of the liquid outlet hole 1b, and a stepped surface 1c is formed between the liquid inlet hole 1a and the liquid outlet hole 1b. In the embodiment, the liquid inlet hole 1a and the liquid outlet hole 1b are coaxially arranged, and the stepped surface 1c is an annular surface. The stepped surface 1c is arranged with the middle part being low and the periphery being high.

[0079] In this way, after the functional liquid enters the liquid inlet hole 1a, due to the inclined arrangement of the stepped surface 1c, the functional liquid is not easy to accumulate on the stepped surface 1c, thereby preventing the liquid inlet hole 1a and the liquid outlet hole 1b from being blocked, and improving the flowability of the functional liquid.

[0080] Referring to Figure 2 , Figure 4 and Figure 6 , wherein the power supply assembly 5 includes an insulating plug 51, a conductive rod 52, a conductive needle 53 and a conductive column 54.

[0081] The insulating plug 51 is connected with the driving end of the shielding driving part 41, and in the embodiment, the insulating plug 51 is connected with the movable part 412 through a bolt. In the embodiment, the insulating plug 51 is made of an insulating material, including rubber or plastic.

[0082] Referring to Figure 2 , Figure 4 and Figure 6 , the two ends of the conductive rod 52 are respectively connected with the shielding head 42 and the insulating plug 51, and the conductive rod 52 is electrically connected with the shielding head 42. In the embodiment, one end of the conductive rod 52 is connected with the insulating plug 51 through a bolt, and the other end of the conductive rod 52 is threadedly connected with the shielding head 42. Specifically, in the embodiment, the bottom end of the conductive rod 52 is provided with threads on the outer side surface in the circumferential direction, the conductive rod 52 is inserted into the blocking part 43 and is threadedly connected with the blocking part 43, so as to realize the connection of the conductive rod 52 with the blocking part 43 and the shielding head 42.

[0083] In this way, the dismounting process of the conductive rod 52 and the shielding head 42 is facilitated, and the installation and dismounting efficiency is improved. In addition, since the movable part 412 is limited to rotate relative to the guide sleeve 411, the insulating plug 51 and the conductive rod 52 are also limited to rotate, so that the connection between the conductive rod 52 and the blocking part 43 is not easy to loosen during the lifting movement of the movable part 412, the insulating plug 51, the conductive rod 52, the blocking part 43 and the shielding head 42, thereby ensuring the connection stability of the conductive rod 52, the blocking part 43 and the shielding head 42. The conductive stability of the conductive rod 52, the blocking part 43 and the shielding head 42 is ensured.

[0084] In the embodiment, the blocking part 43 and the shielding head 42 are made of a conductive material, preferably an alloy material, copper, gold, silver or the like.

[0085] Referring to Figure 2 , Figure 4 and Figure 6 , the conductive needle 53 is the power supply end of the power supply assembly. The conductive needle 53 is connected to the shielding head 42 and extends into the needle tube of the needle head 2, and the conductive needle 53 is electrically connected to the shielding head 42. In this embodiment, the conductive needle 53 is fixed to the bottom end of the shielding rod 44, and the conductive needle 53 is electrically connected to the shielding rod 44 to be electrically connected to the shielding head 42.

[0086] In this embodiment, the shielding rod 44 is made of a conductive material. Preferably, it is made of an alloy material, copper, gold, silver, etc.

[0087] Referring to Figure 2 , Figure 4 and Figure 6 , the conductive column 54 is arranged in the main body 1, the conductive column 54 abuts against and is electrically connected to the conductive rod 52, and the conductive column 54 is electrically connected to the external power supply.

[0088] In this embodiment, the conductive rod 52, the conductive needle 53, and the conductive column 54 are all made of a conductive material, preferably an alloy material, copper, gold, silver, etc.

[0089] It should be noted that in some embodiments, the conductive column 54, the conductive needle 53, the conductive column 54, the blocking part 43, the shielding head 42, and the shielding rod 44 only need to be electrically connected, and each individual can have a conductive part to meet the electrical connection between the conductive column 54, the conductive needle 53, the conductive column 54, the blocking part 43, the shielding head 42, and the shielding rod 44.

[0090] In this way, the voltage is introduced by the conductive column 54, and then transmitted to the conductive needle 53 through the conductive rod 52, the blocking part 43, the shielding head 42, and the shielding rod 44, so as to apply voltage at the ejection position of the needle head 2, so as to form an electric field force at the ejection position of the needle head 2 to eject the functional liquid.

[0091] When adjusting the communication area of the outlet hole 1b and the inlet hole 1a, the conductive rod 52 and the shielding head 42 are lifted together. At this time, since the guide column abuts against the side surface of the guide rod, the electrical connection state between the conductive column 54 and the conductive rod 52 is still maintained, and the electrical connection stability is ensured.

[0092] Due to the arrangement of the insulating plug 51, the conductive rod 52 and the shielding driving member 41 are separated, so as to avoid the voltage being sent to the shielding driving member 41 and causing damage to the shielding driving member 41.

[0093] In some embodiments, the conductive needle 53 is arranged in the shielding rod 44, the shielding head 42, and the blocking part 43 and is directly connected to the conductive rod 52, and the shielding rod 44, the shielding head 42, and the blocking part 43 are all made of an insulating material. In order to avoid affecting the electric field at the needle head 2.

[0094] One end of the conductive column 54 is arranged with an elastic member, the guide column is elastically abutted to the guide rod through the elastic member, and the elastic member electrically connects the guide column and the conductive rod 52.

[0095] In this way, since the conductive column 54 and the conductive rod 52 are elastically abutted, the guide column and the conductive rod 52 are easy to maintain a contact state, ensuring the electrical connection stability between the two, even if the conductive rod 52 moves up and down relative to the guide column, the electrical connection state between the conductive column 54 and the conductive rod 52 can still be maintained, ensuring the normal operation of the electrofluidic printing.

[0096] In this embodiment, the elastic member is an elastic sheet, an elastic block or a spring, and the elastic member is made of conductive material, preferably an alloy, copper, gold, silver or the like.

[0097] The main body 1 and the needle 2 are both arranged to be insulated.

[0098] In this way, the main body 1 and the needle body are prevented from being electrified, which avoids affecting the electric field at the ejection position of the needle 2, ensures the printing quality, and reduces the safety hazard.

[0099] The electrofluidic electric printing head, the inkjet printing system and the inkjet printing system provided by the embodiments of the present application can adjust the amount of functional liquid supplied to the needle body by changing the inlet size of the liquid outlet hole 1b, and can regulate the voltage applied to the needle 2 in combination with the power supply assembly 5, so as to adapt to the ejection requirements of the needle 2 with different needle tip sizes.

[0100] Specifically, when a smaller droplet is needed to be printed, a needle 2 with a small needle tip size is replaced, the shielding head 42 is driven by the shielding member 41 to descend, so that the shielding head 42 partially shields the liquid outlet hole 1b, the communication area of the liquid outlet hole 1b and the liquid inlet hole 1a is reduced, the amount of functional liquid entering the needle 2 after entering the liquid outlet hole 1b is reduced, and the amount of liquid supplied by the liquid supply assembly 3 into the liquid inlet hole 1a is also reduced, and the voltage applied to the needle 2 by the power supply assembly 5 is adaptively adjusted, so that the printing of small droplets can be realized. Since the amount of functional liquid entering the needle 2 is reduced, the needle 2 can normally consume the functional liquid in the needle 2, the functional liquid is not easy to accumulate to cause blockage, and the functional liquid is not easy to be attached and ejected with ejection, so as to ensure the printing quality and precision.

[0101] When a larger drop needs to be printed, the needle 2 with a larger needle tip size is replaced, the drive member 41 drives the shielding head 42 to rise, the shielding head 42 shields the liquid outlet hole 1b to a smaller extent, the communication area of the liquid outlet hole 1b and the liquid inlet hole 1a is enlarged, the amount of functional liquid entering the needle 2 after entering the liquid outlet hole 1b is increased, and the amount of liquid supplied by the liquid supply assembly 3 to the liquid inlet hole 1a is also increased, and the voltage applied to the needle 2 by the power supply assembly 5 is adaptively adjusted, so that the printing of large drops can be realized. Since the amount of functional liquid entering the needle 2 is increased, the demand for the amount of functional liquid required for the needle 2 to eject is met, and bubbles are less likely to be generated in the needle 2 due to insufficient functional liquid, thereby ensuring the printing quality and precision.

[0102] Therefore, by changing the communication area of the liquid outlet hole 1b and the liquid inlet hole 1a, and adaptively adjusting the outputs of the power supply assembly 5 and the liquid supply assembly 3, the printing quality and precision are ensured, and the applicability of the electro-fluidic printhead is improved.

[0103] Another embodiment of the present application provides an electro-fluidic electric printing head as described above.

[0104] Another embodiment of the present application provides an electro-fluidic electric printing head as described above.

[0105] Another embodiment of the present application provides an electro-fluidic electric printing head as described above.

[0106] Another embodiment of the present application provides an electro-fluidic electric printing head as described above.

[0107] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0108] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0109] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. An electrohydrodynamic printhead characterized by, It comprises: a main body, which is internally provided with a liquid inlet hole and a liquid outlet hole in communication from top to bottom; a needle head, which is detachably connected to the bottom end of the main body and is in communication with the liquid outlet hole; a liquid supply assembly, which is in communication with the liquid inlet hole to supply functional liquid to the liquid inlet hole; a shielding assembly, which comprises a shielding driving member and a shielding head, the shielding head comprises a plurality of shielding segments with different outer diameters, the outer diameters of the plurality of shielding segments are sequentially connected from top to bottom, and the outer diameters of the plurality of shielding segments sequentially decrease from top to bottom; the shielding driving member is connected to the main body, and the shielding driving member drives the shielding head to move up and down, and the shielding head is adapted to partially or completely block the liquid outlet hole; a power supply assembly, which comprises a power supply end located at the needle head.

2. The electrohydrodynamic printing head of claim 1, wherein, The shielding head is in the shape of a cone or a platform, and the bottom surface area of the shielding head is smaller than the top surface area.

3. An electrohydrodynamic printing head according to claim 1 or 2, wherein, The shielding driving member comprises: a guide sleeve, which is connected to the top surface of the main body and is in communication with the main body; a movable part, which is provided in the guide sleeve to move up and down, and is connected to the shielding head; a shielding linear module, which is drivingly connected to the movable part to drive the movable part and the shielding head to move up and down.

4. The electrohydrodynamic printing head of claim 1, wherein The shielding assembly further comprises a blocking part, which is connected to the top of the shielding head, and the circumferential outer side of the blocking part is attached to the hole wall of the liquid inlet hole.

5. An electrohydrodynamic printing head according to claim 1 or 2, wherein The shielding assembly further comprises a shielding rod, which is connected to the bottom end of the shielding head, is inserted into the liquid outlet hole, and has an outer diameter smaller than the hole diameter of the liquid outlet hole.

6. An electrohydrodynamic printing head according to claim 1 or 2, wherein The power supply assembly comprises: an insulating plug, which is connected to the driving end of the shielding driving member; a conductive rod, both ends of which are respectively connected to the shielding head and the insulating plug, and the conductive rod is electrically connected to the shielding head; a conductive needle, which is connected to the shielding head and extends into the needle tube of the needle head, and the conductive needle is electrically connected to the shielding head; a conductive column, which is provided in the main body, abuts against and is electrically connected to the conductive rod, and is electrically connected to an external power source; wherein the main body and the needle head are both insulated.

7. The electrohydrodynamic printing head of claim 1, wherein The liquid supply assembly comprises: a liquid supply pipe, which is in communication with the liquid inlet hole; a liquid supply cylinder, which is used to store functional liquid; the liquid supply cylinder is in communication with the liquid supply pipe, and the liquid supply cylinder is in communication with an external gas supply mechanism.

8. An electrohydrodynamic printing head according to claim 7, wherein The hole diameter of the liquid inlet hole is larger than the hole diameter of the liquid outlet hole, a stepped surface is formed between the liquid inlet hole and the liquid outlet hole, and the stepped surface is arranged with a low middle part and a high peripheral part.

9. A jet printing apparatus characterized by comprising: It comprises the electrofluidic electrodynamic printing head as claimed in any one of claims 1 to 8.

10. An inkjet printing system, characterized by, It comprises the electrofluidic electrodynamic printing head as claimed in any one of claims 1 to 8, and / or the jet printing device as claimed in claim 9.

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