An electromagnetic valve type inkjet printing nozzle and an inkjet printing device

Abstract

The present application discloses an electromagnetic valve type printing nozzle and a printing device, relating to the technical field of printing. The electromagnetic valve type printing nozzle includes an upper ink chamber seat, a lower ink chamber seat, and a cavity seat which are connected in sequence from top to bottom; an ink chamber is formed between the upper ink chamber seat and the lower ink chamber seat; an ink inlet nozzle communicating with the ink chamber is provided above the upper ink chamber seat; a plurality of cavities with openings at both upper and lower ends are provided in the cavity seat; a plurality of ink inlet channels corresponding to the cavities and communicating between the ink chamber and the cavities are provided in the lower ink chamber seat; a nozzle assembly is correspondingly provided below each cavity, and a nozzle for ejecting a liquid to be printed is provided in the nozzle assembly; the lower ink chamber seat is made of a magnetic core material or a plurality of static iron cores corresponding to the cavities are provided in the lower ink chamber seat, and an electromagnetic coil is provided on the outer periphery of the lower ink chamber seat; an electromagnetic valve assembly is provided in each cavity. The present application solves the problems of low printing efficiency and low control precision of the existing electromagnetic valve type nozzles, and improves the printing efficiency and control precision.

Description

Technical Field

[0001] This application relates to the field of inkjet printing technology, and particularly relates to an electromagnetic valve type inkjet print head and an inkjet printing device. Background Art

[0002] Inkjet printing is a non-contact, non-pressure, and non-plate digital imaging method. After the information stored in an electronic computer is input into an inkjet printer, printing can be carried out. The basic principle of inkjet printing is to use a fine nozzle to eject ink into small ink droplets at a certain speed, and then use the inkjet head to guide the small ink droplets to the set positions on the printing substrate, and the ink image is reproduced through the interaction between the ink and the printing substrate. The print head of an electromagnetic valve type inkjet printer generally consists of 7 groups or 16 groups of high-precision intelligent micro valves. During printing, the characters or graphics to be printed are processed by the computer main board, and a series of electrical signals are output through the output board to the intelligent micro electromagnetic valves. The valves open and close quickly, and the ink is ejected as ink dots relying on the internal constant pressure. The ink dots form characters or graphics on the surface of the moving substrate to be printed.

[0003] Currently, in the ink liquid circulation system of an electromagnetic valve type inkjet printer, the electromagnetic valve is mainly used to switch the flow path of the ink liquid or solvent. One electromagnetic valve is set for one flow path to control the opening and closing of the flow path. Therefore, an electromagnetic valve is set for each flow path that needs to be controlled for opening and closing, and each electromagnetic valve needs to be controlled separately, resulting in low efficiency and accuracy; moreover, the existing electromagnetic valve type print head can only achieve single-in and single-out of the ink. There are too many external pipelines. As many pipelines are required as there are nozzles, so the structure of the print head is complex, which limits the integrated number of nozzles on the print head and cannot perform high-efficiency printing; in addition, each electromagnetic valve type print head needs to be fixed on a base, and there are certain assembly errors, which in turn affect the spraying accuracy. Summary of the Invention

[0004] By providing an electromagnetic valve type inkjet print head and an inkjet printing device in an embodiment of this application, the problem of low printing efficiency and control accuracy of the existing electromagnetic valve type print head is solved. The electromagnetic valve type inkjet print head provided in this application has high printing efficiency and control accuracy.

[0005] To achieve the above object, this application mainly provides the following technical solutions:

[0006] This application provides an electromagnetic valve type inkjet print head, which includes an upper ink chamber seat, a lower ink chamber seat, and a cavity seat connected in sequence from top to bottom;

[0007] An ink chamber is formed between the upper ink chamber seat and the lower ink chamber seat; an ink inlet nozzle communicating with the ink chamber is provided above the upper ink chamber seat;

[0008] A plurality of cavities with openings at both upper and lower ends are provided in the cavity seat;

[0009] A plurality of ink inlet channels corresponding to the cavities and communicating between the ink chamber and the cavities are provided inside the lower seat of the ink chamber;

[0010] A nozzle assembly is correspondingly provided below each cavity, and a nozzle for ejecting the liquid to be printed is provided inside the nozzle assembly;

[0011] The lower seat of the ink chamber is made of a magnetic core material or a plurality of static iron cores corresponding to the cavities are provided inside the lower seat of the ink chamber, and an electromagnetic coil is provided on the outer periphery of the lower seat of the ink chamber;

[0012] An electromagnetic valve assembly is provided inside each cavity, and the electromagnetic valve assembly is used to open and block the nozzles inside the nozzle assembly when the electromagnetic coil is energized and de-energized respectively.

[0013] Preferably, a filter screen is provided inside the ink chamber for filtering the liquid to be printed entering the ink inlet channels from the ink chamber.

[0014] Preferably, the electromagnetic valve assembly includes a push rod, a spring, and a moving iron core;

[0015] An upwardly open groove is provided inside the moving iron core; the upper end of the push rod is fixedly connected to the lower seat of the ink chamber, the lower end of the push rod extends into the groove of the moving iron core and is connected to the upper end of the spring, and the lower end of the spring is connected to the bottom of the groove; the moving iron core can move up and down along the direction of the push rod;

[0016] When the electromagnetic coil is not energized, the moving iron core blocks the nozzle of the nozzle assembly under the elastic force of the spring; when the electromagnetic coil is energized, the moving iron core moves upward under the magnetic force generated by the lower seat of the ink chamber or the static iron core to open the nozzle of the nozzle assembly.

[0017] Preferably, a sealing gasket is provided on the lower end surface of the moving iron core for blocking the nozzle of the nozzle assembly.

[0018] Preferably, the static iron core extends into the cavity, and the upper end of the push rod is fixedly connected to the lower end of the static iron core.

[0019] Preferably, the ink inlet channel is located inside the static iron core, and the outlet of the ink inlet channel on the cavity side is located on the side surface of the static iron core.

[0020] Preferably, a nozzle assembly fixing seat is further connected below the cavity seat, and a plurality of nozzle assembly mounting holes corresponding to the cavities and communicating with each other are provided inside the nozzle assembly fixing seat, and the nozzle assembly is mounted inside the nozzle assembly mounting holes.

[0021] Preferably, the nozzle assembly includes a nozzle seat and a sealing gasket;

[0022] The nozzle seat is a convex structure including a small-diameter end and a large-diameter end. The nozzle is located inside the nozzle seat and is arranged along the axial direction of the nozzle seat. The small-diameter end of the nozzle seat is threadedly connected to the nozzle assembly mounting hole. A sealing gasket is provided between the large-diameter end of the nozzle seat and the nozzle assembly fixing seat.

[0023] An adjusting gasket is further provided between the large-diameter end of the nozzle seat and the sealing gasket for adjusting the installation depth of the nozzle seat in the nozzle assembly mounting hole.

[0024] Preferably, a first sealing washer is provided at the connection between the upper ink chamber seat and the lower ink chamber seat. A second sealing washer is provided at the connection of each cavity between the lower ink chamber seat and the cavity seat. A third sealing washer is provided at the connection of each nozzle assembly mounting hole between the cavity seat and the nozzle assembly fixing seat.

[0025] Preferably, the cavity seat and the nozzle assembly fixing seat are respectively provided with a groove and a protrusion that cooperate with each other at the connection.

[0026] This application also provides an inkjet printing device including the electromagnetic valve type inkjet print head described above.

[0027] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0028] In the electromagnetic valve type inkjet print head provided by this application, all the inkjet flow paths share an ink chamber and an ink inlet nozzle, enabling single inlet and multiple outlets of the liquid to be printed, greatly reducing the number of ink inlet pipelines in the print head. When the number of nozzles needs to be increased, there is no need to additionally increase the ink chamber and ink inlet pipelines. Only the number of electromagnetic valve assemblies, cavities, and nozzle assembly mounting holes needs to be correspondingly increased, thereby simplifying the internal structure of the print head and reducing the manufacturing complexity of the multi-nozzle integrated print head. The electromagnetic valve type inkjet print head provided by this application can increase the number of nozzle integrations, achieve single inlet and multiple outlets, and greatly improve the inkjet printing efficiency.

[0029] In the electromagnetic valve type inkjet print head provided by this application, one electromagnetic coil can simultaneously control the opening and closing of multiple electromagnetic valve assemblies, improving the control accuracy of simultaneous inkjet of multiple nozzles.

[0030] Since the electromagnetic valve type inkjet print head provided by this application can achieve single inlet and multiple outlets and simultaneous inkjet of multiple nozzles, it is suitable for printing processes such as printing the same printing ink over a large area, such as single-color printing and multi-color printing with large-area single-color repetition, etc., and can improve the printing efficiency of these printing processes. The electromagnetic valve type inkjet print head provided by this application can replace the traditional printing form of a uniform padding mangle, not only effectively controlling the liquor pick-up rate of the fabric, but also enabling high-speed printing. As a water-saving, green, environmental protection, and energy-saving device, it is one of the ways to change the traditional printing method. Description of the Drawings

[0031] Figure 1 Schematic diagram of the internal structure of an electromagnetic valve type inkjet print head provided by an embodiment of the present application;

[0032] Figure 2 Schematic diagram of the external structure of an electromagnetic valve type inkjet print head provided by an embodiment of the present application;

[0033] Figure 3 Schematic diagram of the internal structure of an electromagnetic valve type inkjet print head provided by another embodiment of the present application;

[0034] Figure 4 Schematic diagram of the partial structure of an electromagnetic valve type inkjet print head provided by an embodiment of the present application;

[0035] Figure 5 Schematic diagram of the partial structure of an electromagnetic valve type inkjet print head provided by another embodiment of the present application;

[0036] Figure 6 Schematic diagram of the structure of the lower ink chamber seat of an electromagnetic valve type inkjet print head provided by an embodiment of the present application;

[0037] Figure 7 Schematic diagram of the structure of the cavity seat of an electromagnetic valve type inkjet print head provided by an embodiment of the present application. Detailed implementation manners

[0038] To further elaborate on the technical means and effects adopted by the present application to achieve the intended application purpose, the following will, in conjunction with the accompanying drawings and preferred embodiments, describe in detail the specific implementation manners, structures, features, and effects thereof according to the present application.

[0039] It should be noted that different "one embodiment" or "embodiments" in the present application do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form. It should be understood that the embodiments of the present application are explanations of the present application's solutions and do not limit the protection scope of the present application.

[0040] Unless otherwise stated, none of the methods described herein are intended to require their steps to be performed in a specific order. Therefore, when a method claim does not actually state that its steps follow a certain order or it is not otherwise specifically indicated in the claims or the specification that the steps are limited to a specific order, no specific order is intended to be implied.

[0041] At present, in the ink circulation system of an electromagnetic valve type inkjet printer, an electromagnetic valve needs to be set for each flow path to control the opening and closing of the flow path. Therefore, electromagnetic valves are set for each flow path that needs to be controlled for opening and closing, and each electromagnetic valve needs to be controlled separately, resulting in low efficiency and accuracy. Moreover, the electromagnetic valve type nozzle can only achieve single-in and single-out of ink, and there are too many external pipelines. The number of pipelines required is the same as the number of nozzles, so the structure of the nozzle is complex, which limits the integrated number of nozzles on the nozzle head and makes it impossible to perform high-efficiency printing. In addition, each electromagnetic valve type nozzle needs to be fixed on a base, and there are certain assembly errors, which in turn affect the spraying accuracy.

[0042] To solve the above problems, the present application improves the mechanism of the electromagnetic valve type inkjet nozzle, uses a common ink chamber to achieve single-in and multi-out of ink, and uses an electromagnetic coil to control the opening and closing of the electromagnetic valve at the same time to realize simultaneous inkjet of multiple spray holes. On this basis, the structure of the nozzle is simplified, the integration degree and installation accuracy of the spray holes are improved, thereby improving the printing accuracy and printing efficiency of the electromagnetic valve type inkjet nozzle.

[0043] The overall idea of the technical solution in the embodiment of the present application to solve the above problems is as follows:

[0044] The embodiment of the present application provides an electromagnetic valve type inkjet nozzle, as Figure 1 and Figure 2 shown, which includes an ink chamber upper seat 2, an ink chamber lower seat 5, and a cavity seat 7 connected in sequence from top to bottom; an ink chamber 19 is formed between the ink chamber upper seat and the ink chamber lower seat; an ink inlet nozzle 1 communicating with the ink chamber is arranged above the ink chamber upper seat; a plurality of cavities 16 with openings at both upper and lower ends are arranged in the cavity seat; a plurality of ink inlet channels 17 corresponding to the cavities and communicating between the ink chamber and the cavities are arranged in the ink chamber lower seat; a spray hole assembly 9 is correspondingly arranged below each cavity; as Figure 4 shown, a spray hole 21 for spraying the liquid to be printed is arranged in the spray hole assembly 9; the ink chamber lower seat is made of magnetic core material, or, as Figure 3 shown, a plurality of static iron cores 51 corresponding to the cavities are arranged in the ink chamber lower seat; an electromagnetic coil 4 is arranged on the outer periphery of the ink chamber lower seat; an electromagnetic valve assembly is arranged in each cavity for opening and blocking the spray holes in the spray hole assembly when the electromagnetic coil is energized and de-energized respectively.

[0045] Specifically, in the above electromagnetic valve type inkjet nozzle, the ink inlet nozzle can be connected to the ink path system for supplying ink to the ink chamber, and the ink chamber is used for storing the liquid to be printed introduced from the ink inlet nozzle. Specifically, the ink inlet nozzle can be one or more, and the number of ink inlet nozzles can be set according to actual needs. When there are multiple ink inlet nozzles, multiple ink inlet nozzles can be used to supply ink to the ink chamber at the same time, or one of the multiple ink inlet nozzles can be set as an air port for discharging the air in the ink chamber, which can be specifically set according to the ink supply system. The electromagnetic coil can be connected to an external power supply for supplying power to the electromagnetic coil.

[0046] Specifically, when the lower ink chamber base is made of a magnetic core material, the lower ink chamber base can be integrally formed. When the electromagnetic coil is energized, the lower ink chamber base generates a magnetic force, and under the action of this magnetic force, the solenoid valve assembly opens the nozzles in the nozzle assembly; when a stationary iron core is provided in the lower ink chamber base, the lower ink chamber base can be made of other materials that are not magnetic core materials. When the electromagnetic coil is energized, the stationary iron core generates a magnetic force, and under the magnetic force of the stationary iron core, the solenoid valve assembly opens the nozzles in the nozzle assembly.

[0047] During printing, after the ink supply system supplies ink to the ink chamber, the liquid to be printed in the ink chamber enters each cavity through each ink inlet channel, that is, the liquid to be printed fills the entire ink chamber and each cavity; when the electromagnetic coil is not energized, the solenoid valve assembly blocks the nozzles in the nozzle assembly, and the liquid to be printed in the cavity cannot enter the nozzles, so inkjet printing cannot be performed; when the electromagnetic coil is energized, the lower ink chamber base or the stationary iron core generates a magnetic force under the induction of the electromagnetic coil, and under the action of this magnetic force, the solenoid valve assembly opens the nozzles in the nozzle assembly, so that the liquid to be printed in the cavity can enter the nozzles and be ejected.

[0048] In the solenoid valve type inkjet printing head provided by the present application, when the electromagnetic coil is not energized, the solenoid valve assembly in each cavity blocks the nozzles in the corresponding nozzle assembly; when the electromagnetic coil is energized, the solenoid valve assembly in each cavity opens the nozzles in the nozzle assembly, so that the liquid to be printed in the cavity is ejected through the nozzles in the nozzle assembly. That is, one electromagnetic coil can simultaneously control the opening and closing of all solenoid valve assemblies, which can improve the control accuracy of simultaneous inkjet of multiple nozzles.

[0049] In the solenoid valve type inkjet printing head provided by the present application, all the inkjet flow paths share an ink chamber and an ink inlet nozzle, which can achieve single inlet and multiple outlets of the liquid to be printed, greatly reducing the number of ink inlet pipelines in the printing head. When the number of nozzles needs to be increased, there is no need to additionally increase the ink chamber and ink inlet pipelines. Only the number of solenoid valve assemblies, cavities, and nozzle assembly mounting holes needs to be correspondingly increased, thereby simplifying the internal structure of the printing head and reducing the manufacturing complexity of the multi-nozzle integrated printing head. The solenoid valve type inkjet printing head provided by the present application can increase the number of integrated nozzles, achieve single inlet and multiple outlets, and can greatly improve the printing efficiency.

[0050] The solenoid valve type inkjet print head provided by this application can achieve single inlet and multiple outlets and simultaneous inkjet from multiple nozzles, so it is suitable for the printing process of large-area printing of the same printing ink, such as single-color printing, multi-color printing with large-area single-color repetition, etc., which can improve the printing efficiency of these printing processes. Currently known traditional single-color textile printing technologies all have many disadvantages such as serious water pollution, uneven printing, serious waste of dyes and energy, complex and difficult-to-adjust printing equipment, large floor space, and high equipment maintenance costs. The solenoid valve type inkjet print head provided by this application can replace the printing form of traditional even rolling mills, not only effectively control the liquid carrying rate of fabrics, but also achieve high-speed printing. As a water-saving, green, environmental protection and energy-saving device, it is one of the ways to change traditional printing.

[0051] As a preferred embodiment of this application, as Figure 1 and Figure 2 shown, a filter screen 18 is provided in the above-mentioned ink chamber, which is used to filter the liquid to be printed entering the ink supply channel from the ink chamber, so as to avoid blockage of the ink path system caused by impurities in the liquid to be printed. Specifically, the filter screen is arranged at the connection of the upper seat and the lower seat of the ink chamber, dividing the ink chamber into upper and lower parts. Through this setting, it is convenient to disassemble, wash and replace the filter screen, and the filter screen can have a large filtering area, and the flow path can still be kept unobstructed when the ink chamber supplies ink to multiple cavities at the same time.

[0052] As a preferred embodiment of this application, as Figure 1 , Figure 3 and Figure 5 shown, the above-mentioned solenoid valve assembly includes a push rod 15, a spring 13, and a moving iron core 14;

[0053] An upwardly opening groove is provided in the above-mentioned moving iron core; the upper end of the above-mentioned push rod is fixedly connected to the lower seat of the ink chamber, the lower end of the above-mentioned push rod extends into the groove of the above-mentioned moving iron core and is connected to the upper end of the above-mentioned spring, and the lower end of the above-mentioned spring is connected to the bottom of the groove; the above-mentioned moving iron core can move up and down along the direction of the push rod;

[0054] When the electromagnetic coil is not energized, the moving iron core blocks the nozzle 21 of the above-mentioned nozzle assembly under the elastic force of the spring; when the electromagnetic coil is energized, the moving iron core moves upward under the magnetic force generated by the lower seat of the ink chamber or the static iron core and opens the nozzle of the above-mentioned nozzle assembly.

[0055] In the above-mentioned solenoid valve assembly, by setting the push rod, the moving iron core can move up and down only along the direction of the push rod under the action of magnetic force and the elastic force of the spring, which can avoid the position misalignment between the moving iron core and the nozzle assembly, resulting in the inability to block the nozzle of the nozzle assembly.

[0056] As a preferred embodiment of this application, as Figure 4As shown in the figure, a sealing gasket 12 is provided on the lower end surface of the movable iron core to block the spray holes in the spray hole assembly. Through this setting, the sealing performance of the movable iron core when blocking the spray holes can be improved.

[0057] As a preferred embodiment of the present application, as Figure 3 and Figure 6 shown in the figure, the above-mentioned static iron core 51 extends into the cavity, and the upper end of the above-mentioned ejector rod is fixedly connected to the lower end of the static iron core. Through this setting, when the electromagnetic coil is energized, the magnetic force generated by the static iron core can be enhanced to attract the movable iron core, and the control accuracy of the solenoid valve assembly can be improved.

[0058] As a preferred embodiment of the present application, as Figure 3 and Figure 6 shown in the figure, the above-mentioned ink inlet channel 17 is located in the static iron core 51, and the outlet 52 of the ink inlet channel 17 on the cavity side is located on the side surface of the static iron core 51. Through this setting, the integration degree of the internal structure of the nozzle can be improved, and the internal space of the nozzle can be saved. Specifically, the inlet of the ink inlet channel on the ink chamber side is also located on the static iron core, that is, the static iron core penetrates between the ink chamber and the cavity.

[0059] As a preferred embodiment of the present application, as Figure 1 and Figure 2 shown in the figure, a spray hole assembly fixing seat 8 is further provided below the cavity seat. A plurality of spray hole assembly mounting holes corresponding to and communicating with the cavity are provided in the spray hole assembly fixing seat, and the spray hole assembly 9 is mounted in the spray hole assembly mounting holes. Since the spray hole assembly mounting holes can be machined on the spray hole assembly fixing seat at one time, the installation simplicity and installation accuracy of the spray hole assembly on the nozzle can be improved, and the precision error of the spray hole position can be reduced.

[0060] Specifically, as Figure 4 shown in the figure, the above-mentioned spray hole assembly 9 includes a spray hole seat 22 and a sealing gasket 11; the above-mentioned spray hole seat 22 is a convex structure including a small-diameter end and a large-diameter end, the above-mentioned spray holes are located in the spray hole seat and are arranged along the axial direction of the spray hole seat; the small-diameter end of the spray hole seat is threadedly connected to the spray hole assembly mounting hole; a sealing gasket 11 is provided between the large-diameter end of the spray hole seat and the spray hole assembly fixing seat; through this setting, the simple installation of the spray hole seat on the spray hole assembly fixing seat can be realized. When the electromagnetic coil is not energized, the movable iron core presses the upper end surface of the spray hole seat, thereby blocking the spray holes. By providing a sealing gasket between the large-diameter end of the spray hole seat and the spray hole assembly fixing seat, the sealing at the connection between the spray hole seat and the spray hole assembly fixing seat can be ensured, and ink leakage can be avoided.

[0061] Specifically, as Figure 4 shown in the figure, an adjusting gasket 10 is further provided between the large-diameter end of the spray hole seat and the sealing gasket, which is used to adjust the installation depth of the spray hole seat in the spray hole assembly mounting hole, so as to adjust the pressing force between the movable iron core and the upper end surface of the spray hole seat, and ensure complete blocking of the spray holes.

[0062] Specifically, in the solenoid valve type inkjet print head provided by the present application, the upper ink chamber seat, the lower ink chamber seat, the cavity seat and the nozzle assembly fixing seat are all hermetically connected to avoid ink leakage in the internal ink path system of the print head. Preferably, as Figure 1 shown, a first sealing washer 3 is provided at the connection between the upper ink chamber seat and the lower ink chamber seat to ensure the sealing performance of the ink chamber; a second sealing washer 6 is provided at the connection between each cavity of the lower ink chamber seat and the cavity seat; a third sealing washer 20 is provided at the connection between each nozzle assembly mounting hole of the cavity seat and the nozzle assembly fixing seat to ensure the sealing performance of each cavity and avoid ink leakage.

[0063] As a preferred embodiment of the present application, the cavity seat and the nozzle assembly fixing seat are respectively provided with a groove and a protrusion that cooperate with each other at the connection. For example, as Figure 1 and Figure 7 shown, the lower end opening of the cavity 16 is set as a protrusion structure, and the upper end opening of the nozzle assembly mounting hole is set as a corresponding groove structure. Through this setting, when assembling the print head, the relative position accuracy between the cavity seat and the nozzle assembly fixing seat can be ensured, and the moving iron core in the solenoid valve assembly in the cavity and the nozzle in the nozzle assembly can be aligned, reducing the position accuracy error of the nozzle and improving the installation accuracy.

[0064] The present application also provides an inkjet printing device, including the above-mentioned solenoid valve type inkjet print head.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present application, and they should all be covered by the scope of the claims of the present application.

Claims

1. A solenoid valve type inkjet printhead, characterized in that, It includes an upper ink chamber seat, a lower ink chamber seat, and a cavity seat that are connected in sequence from top to bottom; An ink chamber is formed between the upper ink chamber seat and the lower ink chamber seat; an ink inlet nozzle communicating with the ink chamber is provided above the upper ink chamber seat; A plurality of cavities with openings at both upper and lower ends are provided in the cavity seat; A plurality of ink inlet channels corresponding to the cavities are provided in the lower ink chamber seat and communicate between the ink chamber and the cavities; A nozzle assembly is correspondingly provided below each cavity, and a nozzle for ejecting the liquid to be printed is provided in the nozzle assembly; The lower ink chamber seat is made of a magnetic core material or a plurality of static iron cores corresponding to the cavities are provided in the lower ink chamber seat, and an electromagnetic coil is provided on the outer periphery of the lower ink chamber seat; An electromagnetic valve assembly is provided in each cavity, and the electromagnetic valve assembly is used to open and block the nozzles in the nozzle assembly when the electromagnetic coil is energized and de-energized respectively; When the electromagnetic coil is not energized, the electromagnetic valve assembly in each cavity blocks the nozzles in the corresponding nozzle assembly; When the electromagnetic coil is energized, the electromagnetic valve assembly in each cavity opens the nozzles in the corresponding nozzle assembly; A nozzle assembly fixing seat is further connected below the cavity seat, and a plurality of nozzle assembly mounting holes corresponding to the cavities and communicating with each other are provided in the nozzle assembly fixing seat, and the nozzle assembly is installed in the nozzle assembly mounting holes; The cavity seat and the nozzle assembly fixing seat are respectively provided with mutually cooperating grooves and protrusions at the connection; 2. The solenoid valve type inkjet print head according to claim 1, wherein, A filter screen is provided in the ink chamber for filtering the liquid to be printed entering the ink inlet channel from the ink chamber.

3. The electromagnetic valve type inkjet print head according to claim 1, wherein, The electromagnetic valve assembly includes a push rod, a spring, and a moving iron core; An upward-opening groove is provided in the moving iron core; the upper end of the push rod is fixedly connected to the lower ink chamber seat, or the upper end of the push rod is fixedly connected to the lower end of the static iron core; The lower end of the push rod extends into the groove of the moving iron core and is connected to the upper end of the spring, and the lower end of the spring is connected to the bottom of the groove; the moving iron core can move up and down along the direction of the push rod; When the electromagnetic coil is not energized, the moving iron core blocks the nozzles of the nozzle assembly under the elastic force of the spring; when the electromagnetic coil is energized, the moving iron core moves upward under the magnetic force generated by the lower ink chamber seat or the static iron core to open the nozzles of the nozzle assembly.

4. The electromagnetic valve type inkjet print head according to claim 3, characterized in that, A sealing gasket is provided on the lower end surface of the moving iron core for blocking the nozzles of the nozzle assembly.

5. The electromagnetic valve type inkjet print head according to claim 3, wherein, The static iron core extends into the cavity.

6. The solenoid valve type inkjet printhead according to claim 5, characterized in that, The ink inlet channel is located in the static iron core, and the outlet of the ink inlet channel on the cavity side is located on the side surface of the static iron core.

7. The electromagnetic valve type inkjet nozzle according to claim 1, characterized in that, The nozzle assembly includes a nozzle seat and a sealing gasket; The nozzle seat is a convex structure including a small-diameter end and a large-diameter end, the nozzle is located in the nozzle seat and is arranged along the axial direction of the nozzle seat; the small-diameter end of the nozzle seat is threadedly connected to the nozzle assembly mounting hole; a sealing gasket is provided between the large-diameter end of the nozzle seat and the nozzle assembly fixing seat; An adjusting gasket is further provided between the large-diameter end of the nozzle seat and the sealing gasket for adjusting the installation depth of the nozzle seat in the nozzle assembly mounting hole.

8. The solenoid valve type inkjet print head according to claim 1, characterized in that, A first sealing washer is provided at the connection between the upper ink chamber seat and the lower ink chamber seat; a second sealing washer is provided at the connection of each cavity between the lower ink chamber seat and the cavity seat; a third sealing washer is provided at the connection of each ink jet hole assembly mounting hole between the cavity seat and the ink jet hole assembly fixing seat.

9. An inkjet printing device, characterized in that, It includes the electromagnetic valve type ink jet print head according to any one of claims 1-8.

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