Printing head with three-dimensionally curved mixing flow channel, printing device, printing control device and printing system

Abstract

The utility model relates to a printing nozzle and device with three-dimensional curved mixed flow channel, printing nozzle includes: nozzle body, it is equipped with two above liquid inlet of supplying two above different liquid, the ejection face with spray orifice and has three-dimensional curved mixed flow channel, and the liquid inlet end and liquid outlet end of three-dimensional curved mixed flow channel are communicated two above liquid inlet and spray orifice respectively, three-dimensional curved mixed flow channel includes by having two above shunt flow channel, the shunt section of two above shunt flow channel is connected with two above shunt flow channel and is communicated in any arrangement combination order and is connected into continuous mixed flow channel, droplet ejector, it is equipped with the outer surface of ejection face and is configured as printing liquid in three-dimensional curved mixed flow channel from spray orifice and sprays out. Realize two above different kinds liquid in nozzle body inside three-dimensional curved mixed flow channel and mix into printing liquid evenly, guarantee mixing effect, and droplet ejector is located the outer surface of ejection face, reduces the manufacturing difficulty of printing nozzle, and is convenient for maintenance.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a printhead, printing equipment, printing control device and printing system with a three-dimensional curved mixing channel. Background Technology

[0002] When printing a target color, existing printing equipment first mixes a large amount of magenta, yellow, cyan, and black ink in a mixing tank according to a certain ratio to form the target color ink. Then, the prepared target color ink is fed into the printhead, which sprays the target color ink onto the fabric to complete the printing. Although the above method can achieve the printing of the target color, it requires cleaning not only the internal tubing of the printhead but also the mixing tank before printing another target color to avoid affecting the mixing of the other color ink. Cleaning is time-consuming and troublesome. Furthermore, when premixing various color inks into the target color ink in the mixing tank, due to the large amount of ink, it requires a long stirring time to achieve uniform mixing. The stirring effect is poor and the mixing efficiency is low, thus reducing production efficiency and increasing production costs. Utility Model Content

[0003] This invention addresses the problems existing in the prior art by providing a printhead and its device with a three-dimensional curved mixing channel. It enables two or more liquids to mix in the three-dimensional curved mixing channel inside the printhead to form printing liquid, which is then ejected from the nozzle under the action of a droplet ejector. This results in high printing efficiency. Furthermore, the droplet ejector is located on the outer surface of the spraying surface and adjacent to the nozzle, reducing the manufacturing difficulty of the printhead and facilitating its maintenance.

[0004] This utility model provides a printhead with a three-dimensional curved mixing channel, comprising: a printhead body having two or more inlets for supplying two or more different liquids, a spray surface with nozzles, and a three-dimensional curved mixing channel, wherein the inlet end and outlet end of the three-dimensional curved mixing channel are respectively connected to two or more inlets and nozzles; the three-dimensional curved mixing channel includes a continuous mixing channel formed by a flow-dividing section having two or more flow-dividing channels and a flow-merging section connected to the two or more flow-dividing channels in any arrangement and combination order; and a droplet ejector disposed on the outer surface of the spray surface and configured to eject the printing liquid in the three-dimensional curved mixing channel from the nozzles.

[0005] In one embodiment, the nozzle body is provided with multiple channel substrates stacked sequentially, each channel substrate is provided with a liquid channel, and the liquid channels of all adjacent channel substrates are connected and spliced ​​in a predetermined order to form the three-dimensional curved mixing channel.

[0006] In one implementation, the diversion section includes a main channel and a plurality of diversion channels connected to the main channel and distributed on both sides of the main channel's extension direction, the plurality of diversion channels having opposite extension directions to the main channel; the confluence section includes a confluence channel and a plurality of branch channels connected to the confluence channel and distributed on both sides of the confluence channel's extension direction, the branch channels being connected to at least one of the diversion channels, the plurality of branch channels having opposite extension directions to the confluence channel.

[0007] In one implementation, at least a portion of the flow channel used to form the confluence section is a bent flow channel; And / or, at least a portion of the diversion channel is a bend; And / or, the direction in which the diversion section connects to the confluence section is a first direction, at least a portion of the two diversion channels are intersected in a second direction intersecting the first direction, and at least a portion of the diversion channel is a bent channel; And / or, the branch flow channel includes at least two branch flow channels that are directly connected at one end and arranged in parallel, and at least a portion of the branch flow channel is a bend flow channel.

[0008] In one embodiment, the bent flow channel is a three-dimensional bent structure, which is formed by splicing multiple flow channel substrates. The bent flow channel is sequentially divided into multiple sub-flow channels along its extension direction. Each flow channel substrate has a corresponding sub-flow channel. The multiple sub-flow channels are sequentially connected and spliced ​​along the extension direction of the bent flow channel to form the bent flow channel.

[0009] In one embodiment, the nozzle body is further provided with a common liquid cavity that communicates with the liquid outlet end of the three-dimensional curved mixing channel, and the common liquid cavity communicates with a plurality of the nozzle holes; The nozzle body is provided with an air vent and / or a cleaning fluid inlet that are connected to the shared liquid chamber.

[0010] In one embodiment, the droplet ejector includes a droplet forming transducer disposed near the nozzle and a droplet forming waveform source that provides a waveform to the droplet forming transducer.

[0011] In addition to the printhead with a three-dimensional curved mixing channel described above, this utility model also provides a printing device, including at least one printhead with a three-dimensional curved mixing channel as described above, two or more liquid storage boxes connected to the printhead and configured to provide two or more different types of liquids, wherein the number of liquid storage boxes is the same as the number of liquid inlets and is arranged in a one-to-one correspondence, and each of the liquid storage boxes is connected to the corresponding liquid inlet through a liquid delivery pipe, the liquid delivery pipe is provided with an inflow control device to control the flow rate of liquid from the liquid storage box into the three-dimensional curved mixing channel, and the controller is electrically connected to the droplet ejector and the inflow control device.

[0012] In one embodiment, the printing device includes two or more printheads with three-dimensional curved mixing channels as described above. The liquid reservoir is connected to the corresponding liquid inlets of the two or more printheads via the liquid delivery pipeline. The liquid delivery pipeline includes a main pipeline connecting to the liquid reservoir and two or more branch pipelines for connecting the main pipeline to the corresponding liquid inlets of the two or more printheads, respectively. The main pipeline is equipped with a delivery pump, and the branch pipelines are equipped with high-speed switching solenoid valves for controlling the flow rate of liquid entering the three-dimensional curved mixing channels.

[0013] In addition to the printhead with a three-dimensional curved mixing channel described above, this utility model also provides a print control device, including the print equipment as described above; an instruction receiving module configured to receive information on substrate parameters and color parameters of a target substrate; a color processing module configured to calculate the types and corresponding proportions of multiple liquids required to form the target color based on the substrate parameters and the color parameters, and to calculate the flow rates of each of the multiple liquids based on the configuration parameters of the printhead and the corresponding proportions of the multiple liquids; an instruction generation module configured to generate corresponding control instructions based on the flow rates of each of the multiple liquids; and an instruction sending module configured to send the control instructions to the controller, so that the controller controls the inflow control device and the droplet ejector to operate.

[0014] In addition to the printhead with a three-dimensional curved mixing channel described above, this utility model also provides a printing system, including a cloud server and at least one user terminal connected to the cloud server, and at least one printing device as described above. The cloud server is communicatively connected to both the printing device and the user terminal. The user terminal includes an input unit for inputting the substrate parameters and color parameters, and a display unit for displaying the status information of the printing device. The cloud server receives the substrate parameters and color parameters data sent by the user terminal and generates control commands. The control commands include the flow rate of each liquid flowing into the three-dimensional curved mixing channel, and sends the control commands to the controller of the printing device. Simultaneously, it receives the collected printing status information and sends it to the user terminal.

[0015] By adopting the above structure, this utility model has the following advantages compared with the prior art: The printhead body has two or more liquid inlets for supplying two or more different liquids, a spray surface with nozzles, and a three-dimensional curved mixing channel. The three-dimensional curved mixing channel in the printhead body enables two or more different types of liquids to be uniformly mixed into printing liquid inside the printhead body, ensuring a uniform mixing effect. In addition, the droplet ejector is located on the outer surface of the spray surface, reducing the manufacturing difficulty of the printhead and facilitating maintenance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a printhead with a three-dimensional curved mixing channel according to an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another angle; Figure 3 for Figure 1 Top view; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the structure of the branching section and the merging section according to an embodiment of this application; Figure 6 This is a structural block diagram of a printing device according to an embodiment of this application; Figure 7 This is another structural block diagram of the printing device according to an embodiment of this application; Figure 8 This is a structural block diagram of the printing control device according to an embodiment of this application; Figure 9 This is a structural block diagram of the printing system according to an embodiment of this application.

[0017] In the attached diagram: Printer nozzle 100; nozzle body 1; first liquid inlet 11a; second liquid inlet 11b; liquid outlet 12; spray surface 2; nozzle 21; flow channel substrate 3; three-dimensional curved mixing flow channel 31; branch section 311; main flow channel 3111; branch flow channel 3112; confluence section 312; merging flow channel 3121; tributary flow channel 3122; common liquid chamber 32; droplet ejector 4; droplet forming transducer 41; droplet forming waveform source 42; printing device 200; liquid storage box 5; liquid delivery pipeline 61; main pipeline 611; branch pipeline 612; delivery pump 62; high-speed switching solenoid valve 63; filter 64; flow sensor 65; on / off valve 66; guide belt 71; driver 72; speed detector 73; controller 8; printing device 200. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] Example 1

[0021] like Figure 1-5As shown, this application embodiment provides a printhead 100 with a three-dimensional curved mixing channel 31, comprising: a printhead body 1, which has two or more inlets for supplying two or more different liquids, a spray surface 2 with nozzles 21, and a three-dimensional curved mixing channel 31 with multi-stage diversion and confluence, wherein the inlet end and outlet end of the three-dimensional curved mixing channel 31 are respectively connected to two or more inlets and nozzles 21; the three-dimensional curved mixing channel 31 includes a diversion section 311 having two or more diversion channels 3112 and a confluence section 312 connected to the two or more diversion channels 3112 in any arrangement to form a continuous mixing channel; and a droplet ejector 4, which is disposed on the outer surface of the spray surface 2 and configured to eject the printing liquid in the three-dimensional curved mixing channel 31 from the nozzles 21. The printhead body 1 is provided with a three-dimensional curved mixing channel 31 with multi-stage diversion and confluence, which can realize the uniform mixing of two or more different types of liquids into the desired color printing liquid through the three-dimensional curved mixing channel 31, ensuring the mixing effect and improving the printing color quality. In addition, the droplet ejector 4 is located on the outer surface of the ejection surface 2, which reduces the manufacturing difficulty of the printhead 100 and facilitates maintenance.

[0022] Furthermore, such as Figure 4 As shown, the printhead body 1 has multiple channel substrates 3 stacked sequentially. Each channel substrate 3 has a liquid channel. The liquid channels of all adjacent channel substrates 3 are connected and spliced ​​in a predetermined order to form the three-dimensional curved mixing channel 31. Since the overall length and width of the multiple channel substrates 3 are between tens of millimeters and hundreds of millimeters, and the overall thickness is between a few tenths of a millimeter and one millimeter, the size of the liquid channels formed by precision machining on the surface of the channel substrates 3 is at the micrometer level. Precision machining methods include etching or photolithography. The three-dimensional curved mixing channel 31 formed by the interconnected liquid channels has a complex and precise microchannel arrangement structure, which is conducive to the flow of different types of liquids in the liquid channels in an alternating split-convergence form to converge into a stable and homogeneous printing liquid.

[0023] Furthermore, there is no limit to the number of liquid inlets; there can be two, three, four, or more. The specific number depends on the requirements. Two or more liquid inlets can be located on the same side or different sides of the nozzle body 1. The central axes of the two or more liquid inlets can be set at an angle or parallel to each other, as long as they can connect with the liquid inlet end of the three-dimensional curved mixing channel 31. There are no specific restrictions. Figure 1 As an example only, there are two or more liquid inlets including a first liquid inlet 11a and a second liquid inlet 11b, which are located on adjacent sides of the nozzle body 1.

[0024] Furthermore, such as Figure 4As shown, the branching section 311 and the confluence section 312 are each formed by at least one of the flow channel substrates 3. Specifically, the arrangement sequence of the branching section 311 and the confluence section 312 can be as follows: at least one branching section 311 is connected to a single confluence section 312 to form a minimum mixing unit; multiple minimum mixing units are sequentially connected in a specific single flow direction and the whole is a serpentine flow channel, a labyrinthine flow channel, a direct flow channel, or a spiral flow channel, etc.; or, multiple minimum mixing units are arranged in multiple rows and columns along intersecting first and second directions, and adjacent mixing units arranged between rows and columns are connected to form a mesh structure; or, multiple minimum mixing units are combined and arranged in a predetermined order to form a tree structure; or, multiple minimum mixing units are sequentially connected in a specific flow direction to form a basic mixing unit; multiple basic mixing units are arranged at intervals along directions intersecting the specific flow channel direction; and the inlet and outlet of multiple basic mixing units are respectively connected through a confluence section 312.

[0025] Specifically, the confluence section 312 can be a single confluence channel 3121, which can be an arc-shaped channel, a direct current channel, or any combination of arc-shaped and direct current channels in any order. The branching channel 3112 can be a V-shaped channel, a U-shaped channel, an arc-shaped channel, a direct current channel, a wavy channel, or a spiral channel, etc. The two branching channels 3112 can be arranged at an angle or parallel and connected to the same or different positions of the single confluence channel 3121. The aforementioned minimum mixing unit can be heart-shaped, rhomboid, annular, teardrop-shaped, etc. Alternatively, the confluence section 312 can be not limited to a single confluence channel 3121. The confluence section 312 can be a tree-branch structure, a T-shaped structure, or an I-shaped structure, etc. Or, the branching section 311 includes not only two or more branching channels 3112, but also other channel structures.

[0026] In one example, such as Figure 5As shown, the diversion section 311 includes a main channel 3111 and a plurality of diversion channels 3112 connected to the main channel 3111 and distributed on both sides of the extension direction of the main channel 3111. The plurality of diversion channels 3112 are opposite to the extension direction of the main channel 3111, so that the diversion section 311 can be connected to the adjacent preceding and following confluence sections 312. The confluence section 312 includes a merging channel 3121 and a plurality of branch channels 3122 connected to the merging channel 3121 and distributed on both sides of the extension direction of the merging channel 3121. The branch channels 3122 are connected to at least one of the diversion channels 3112. The plurality of branch channels 3122 are opposite to the extension direction of the merging channel 3121, so that the confluence section 312 can be connected to the adjacent preceding and following diversion sections 311. A portion of the branch channels 3112 in the branching section 311 are connected to the branch channels 3122 of the preceding confluence section 312, and the remaining portion of the branch channels 3112 are connected to the branch channels 3122 of the following confluence section 312. Similarly, a portion of the branch channels 3122 in the confluence section 312 are connected to the branch channels 3112 of the preceding branching section 311, and the remaining portion of the branch channels 3122 are connected to the branch channels 3112 of the following branching section 311, thereby achieving continuous multi-stage branching and confluence to minimize the concentration deviation of the printing fluid. The structures of the branching section 311 and the confluence section 312 can be completely identical.

[0027] Furthermore, to improve the mixing effect, at least a portion of the flow channel used to form the confluence section 312 is a bent flow channel; and / or, at least a portion of the flow channel 3112 is a bent flow channel; and / or, the direction in which the confluence section 311 connects to the confluence section 312 is a first direction, and at least a portion of the flow channels of the two confluence channels 3112 are intersected in a second direction intersecting the first direction, wherein at least a portion of the flow channel 3112 is a bent flow channel; and / or, the confluence channel 3112 includes at least one end directly connected and arranged in parallel with two branch channels, wherein at least a portion of the flow channel of the branch channel is a bent flow channel. Preferably, the bent flow channel is a three-dimensional bent structure. The bent flow channel as a whole has a height difference or at least partially overlaps in the projection in the height direction. Specifically, it can be bent inward and outward or bent vertically. The bending angle is between 0-180°. The bent flow channel is roughly C-shaped, U-shaped, V-shaped, spiral, wavy, etc. The bent flow channel is formed by splicing multiple flow channel substrates 3. The bent flow channel is sequentially divided into multiple sub-flow channels along its extension direction. Each flow channel substrate 3 is provided with a corresponding sub-flow channel. The multiple sub-flow channels are sequentially connected and spliced ​​along the extension direction of the bent flow channel to form the bent flow channel.

[0028] In some examples, the nozzle body 1 is further provided with a common liquid chamber 32 that communicates with the liquid outlet end of the three-dimensional curved mixing channel 31. The common liquid chamber 32 communicates with a plurality of the nozzle holes 21. The nozzle body 1 is provided with a vent and / or a cleaning fluid inlet that communicate with the common liquid chamber 32. Gas is injected into the common liquid chamber 32 through the vent, and cleaning fluid is injected into the common liquid chamber 32 through the cleaning fluid inlet. By using the backwashing principle, impurities in the common liquid chamber 32 and the three-dimensional curved mixing channel 31 are cleaned.

[0029] In some examples, the nozzle body 1 is also provided with a liquid outlet 12 that communicates with the liquid outlet end of the common liquid chamber 32 or the three-dimensional curved flow channel 31.

[0030] In some examples, the droplet ejector 4 includes a droplet forming transducer 41 disposed near the nozzle 21 and a droplet forming waveform source 42 that provides a waveform to the droplet forming transducer 41. The droplet forming waveform source 42 is connected to a drive circuit to output a corresponding waveform to control the operation of the droplet forming transducer 41, causing the printing liquid in the common liquid chamber 32 to be ejected from the nozzle 21 in a continuous jet form. The droplet forming transducer 41 can be a piezoelectric actuator, a heater, an electromagnetic telescopic actuator, etc.

[0031] Example 2

[0032] like Figure 6 or Figure 7 As shown, based on the above-described printhead 100 with a three-dimensional curved mixing channel 31, this application embodiment also provides a printing device 200, which includes: a controller 8, at least one printhead 100 with a three-dimensional curved mixing channel 31 as described in Embodiment 1, and two or more liquid storage boxes 5 connected to the printhead 100 and configured to provide two or more different types of liquids. The number of liquid storage boxes 5 is the same as the number of liquid inlets and they are arranged in a one-to-one correspondence. Each liquid storage box 5 is connected to the corresponding liquid inlet through a liquid delivery pipe 61. The liquid delivery pipe is provided with an inflow control device to control the flow rate of liquid from the liquid storage box 5 into the three-dimensional curved mixing channel 31. The controller 8 is electrically connected to the droplet ejector 4 and the inflow control device. The inflow control device may include a delivery pump 62 or a high-speed switching solenoid valve 63. Further, the inflow control device also includes a flow sensor 65 and an on / off valve 66, and the liquid delivery pipe is also provided with a filter 64.

[0033] The printing apparatus 200 also includes a motion control device for controlling the moving speed of the target substrate or the print head 100, such as... Figure 6As shown, the example of using a motion control device to control the movement of a target substrate is selected for explanation. The motion control device includes a guide belt 71 for conveying the target substrate, a driver 72 for driving the guide belt 71 to move, and a detector 73 for detecting the movement speed of the guide belt 71. The driver 72 and the detector 73 are electrically connected to the controller 8. The detector 73 sends the actual movement speed of the guide belt 71 detected in real time to the controller 8. When there is a deviation between the actual movement speed of the guide belt 71 and the preset movement speed, the controller 8 generates a correction drive signal based on the deviation value and sends it to the driver 72 to make the actual movement speed match the preset movement speed. The print head 100 sprays a preset volume or mass of printing liquid onto the designated area of ​​the target substrate.

[0034] like Figure 7 As shown, the printing device 200 includes two or more printheads 100 with three-dimensional curved mixing channels 31. The liquid storage tank 5 is connected to the corresponding liquid inlets of the two or more printheads 100 through the liquid delivery pipeline. The liquid delivery pipeline includes a main pipeline 611 connecting to the liquid storage tank 5 and two or more branch pipelines 612 for connecting the main pipeline 611 to the corresponding liquid inlets of the two or more printheads 100, respectively. The main pipeline 611 is equipped with a delivery pump 62, and the branch pipelines 612 are equipped with high-speed switching solenoid valves 63 for controlling the flow rate of liquid entering the three-dimensional curved mixing channels 31. The delivery pump 62 delivers the liquid from the liquid storage tank 5 to the inside of the printheads 100 under positive pressure, ensuring the liquid supply pressure of the delivery pipeline. The flow rate of liquid entering the three-dimensional curved mixing channels 31 is adjusted by regulating the duty cycle of the PWM control signal of the high-speed switching solenoid valve 63 and controlling the number of times the high-speed switching solenoid valve 63 switches on and off. Specifically, the main pipeline 611 can be directly connected to two or more branch pipelines 612, or indirectly connected to two or more branch pipelines 612. The printing device 200 also includes a temporary storage box, with the main pipeline 611 and the two or more branch pipelines 612 all directly connected to the temporary storage box. The liquid in the liquid storage box 5 is transported to the temporary storage box through the main pipeline 61, and the liquid in the temporary storage box is transported to the print head 100 through the branch pipelines. In other embodiments, there is a height difference between the liquid storage box 5 and the temporary storage box. When the on / off valve of the pipeline connecting the liquid storage box 5 and the temporary storage box is opened, the liquid in the liquid storage box 5 flows to the temporary storage box by gravity. The branch pipeline 612 connecting the temporary storage box and the print head 100 is equipped with a delivery pump, and the flow rate of the liquid flowing into the three-dimensional curved mixing channel 31 is controlled by controlling the speed of the delivery pump.

[0035] Example 3

[0036] like Figure 8As shown, based on the above-described printhead 100 with a three-dimensional curved mixing channel 31 and the printing device, this application embodiment also provides a printing control device, including the printing device as described in Embodiment 1 or Embodiment 2, an instruction receiving module, a color processing module, an instruction generation module, and an instruction sending module. The instruction receiving module is configured to receive information on substrate parameters of the target substrate and color parameters of the target color. The instruction receiving module includes an input unit configured to input the substrate parameters and color parameters. The color processing module is configured to calculate the required amount of each liquid to form the target color based on the substrate parameters and the color parameters. The color processing module can directly call a color matching model or formula established based on historical proofing data, and calculate the required types and proportions of various liquids based on the configuration parameters of the print head 100 and the corresponding proportions of the various liquids. Alternatively, the color processing module can directly call a color matching database or lookup table established based on historical proofing data, and find the required types and proportions of various liquids based on the color parameters and substrate parameters. The flow rate of each liquid needs to be calculated based on the corresponding proportions of various liquids. The configuration parameters of the printhead 100 include the ejection frequency, the volume of a single ejected droplet, and the number of nozzles 21. The ejection flow rate of the printhead 100 is calculated by multiplying the ejection frequency by the volume of a single ejected droplet and the number of nozzles 21. During printing, when the outlet 12 is closed (i.e., no printing liquid flows out of the outlet 12), the ejection flow rate of the printhead 100 is the sum of the flow rates of the various liquids entering the three-dimensional curved mixing channel 31. When the outlet 12 is open (i.e., printing liquid flows out of the outlet 12), the flow rate from the outlet is... The outflow rate of the printing liquid from 12 is equal to the sum of the jet flow rate of the print head 100 and the outflow flow rate, which is equal to the sum of the flow rates of the various liquids entering the three-dimensional curved mixing channel 31. Based on the required types and proportions of the various liquids and the sum of the flow rates of the various liquids entering the three-dimensional curved mixing channel 31, the required flow rates of the various liquids are calculated. The instruction generation module is configured to generate corresponding control instructions based on the flow rates of the various liquids. The instruction sending module is configured to send the control instructions to the controller 8 so that the controller 8 controls the inflow control device and the droplet ejector 4 to work.

[0037] Furthermore, the substrate parameters include print width and print length or print area. The print control device also includes a speed calculation module, which is configured to determine the amount of printing liquid required per unit area of ​​the target substrate based on the substrate parameters. The preset moving speed of the target substrate or guide belt is obtained based on the product of the unit area spray volume, the preset moving speed, and the print width, which equals the jet flow rate of the print head 100. The preset moving time of the target substrate or guide belt is obtained based on the quotient of the print length and the preset moving speed. To determine the unit area spray volume, the substrate parameters include the substrate material. Based on the correspondence between the substrate material and the unit area spray volume, the unit area spray volume of the target substrate is obtained. Alternatively, the substrate parameters include the liquid carry-over rate, the unit area weight of the target substrate, and the density of the printing liquid. The unit area spray volume is obtained based on the quotient of the product of the liquid carry-over rate and the unit area weight, and the density of the printing liquid. The instruction generation module is further configured to generate corresponding movement control instructions based on a preset moving speed of the target substrate or guide belt, and the instruction sending module is further configured to send the movement control instructions to the controller 8 so that the controller 8 controls the movement control device to work.

[0038] Example 4

[0039] like Figure 9 As shown, based on the printhead 100 with the three-dimensional curved mixing channel 31 described above, this application embodiment also provides a printing system, including: a cloud server and at least one user terminal connected to the cloud server, and at least one printing device 200 as described in Embodiment 2. The cloud server is communicatively connected to the printing device 200 and the user terminal respectively. The user terminal includes an input unit for inputting the substrate parameters and color parameters and a display unit for displaying the status information of the printing device 200. The cloud server receives the substrate parameters and color parameters data sent by the user terminal and generates control commands. The control commands include the flow rate of each liquid flowing into the three-dimensional curved mixing channel 31, and sends the control commands to the controller 8 of the printing device 200. At the same time, it receives the collected printing status information and sends it to the user terminal. Further, the control commands include waveform parameters for driving the droplet ejector 4, a preset moving speed of the target substrate or printhead 100, and a preset moving time. The determination of the required flow rate of each liquid, the preset moving speed, and the moving time can be referred to Embodiment 3 above. The waveform parameters are determined based on the spray frequency, preset travel time, and volume of a single sprayed droplet mentioned in Example 3.

[0040] Furthermore, the printing device 200 includes a communication unit for communication connection between the cloud server and the controller 8, for sending printing device 200 status information to the cloud server and receiving control commands sent by the cloud server; and / or, the printing device 200 also includes a storage device connected to the controller 8, for storing control commands sent by the cloud server and storing printing device 200 status information; and / or, the printing device 200 also includes a display device connected to the controller 8, for displaying the working status of the inflow control device and the droplet ejector 4.

[0041] Although embodiments of the present invention have been shown and described above, they should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A printhead with a three-dimensional curved mixing channel, characterized in that, include: The nozzle body has two or more inlets for supplying two or more different liquids, a spray surface with nozzles, and a three-dimensional curved mixing channel. The inlet and outlet ends of the three-dimensional curved mixing channel are respectively connected to two or more inlets and nozzles. The three-dimensional curved mixing channel includes a continuous mixing channel formed by connecting a branching section with two or more branching channels and a converging section connected to the two or more branching channels in any arrangement and combination sequence. A droplet ejector is disposed on the outer surface of the ejection surface and configured to eject printing liquid from the nozzle within the three-dimensional curved mixing channel.

2. The printhead with a three-dimensional curved mixing channel according to claim 1, characterized in that, The nozzle body is provided with multiple flow channel substrates stacked sequentially. Each flow channel substrate is provided with a liquid flow channel. The liquid flow channels of all adjacent flow channel substrates are connected and spliced ​​together in a predetermined order to form the three-dimensional curved mixing flow channel.

3. The printhead with a three-dimensional curved mixing channel according to claim 2, characterized in that, The diversion section includes a main channel and a plurality of diversion channels that are connected to the main channel and distributed on both sides of the main channel in the direction of extension. The plurality of diversion channels are opposite to the direction of extension of the main channel. The confluence section includes a confluence channel and a plurality of branch channels connected to the confluence channel and distributed on both sides of the extension direction of the confluence channel. The branch channels are connected to at least one of the branch channels, and the extension directions of the plurality of branch channels are opposite to those of the confluence channel.

4. The printhead with a three-dimensional curved mixing channel according to claim 2 or 3, characterized in that, At least a portion of the flow channel used to form the confluence section is a tortuous flow channel; And / or, at least a portion of the diversion channel is a bend; And / or, the direction in which the diversion section connects to the confluence section is a first direction, at least a portion of the two diversion channels are intersected in a second direction intersecting the first direction, and at least a portion of the diversion channel is a bent channel; And / or, the branch flow channel includes at least two branch flow channels that are directly connected at one end and arranged in parallel, and at least a portion of the branch flow channel is a bend flow channel.

5. The printhead with a three-dimensional curved mixing channel according to claim 4, characterized in that, The bent flow channel is a three-dimensional bent structure. The bent flow channel is formed by splicing multiple flow channel substrates. The bent flow channel is divided into multiple sub-flow channels along its extension direction. Each flow channel substrate has a corresponding sub-flow channel. The multiple sub-flow channels are connected and spliced ​​together along the extension direction of the bent flow channel to form the bent flow channel.

6. The printhead with a three-dimensional curved mixing channel according to claim 1, characterized in that, The nozzle body is also provided with a common liquid cavity that communicates with the liquid outlet end of the three-dimensional curved mixing channel, and the common liquid cavity communicates with multiple nozzle holes; The nozzle body is provided with an air vent and / or a cleaning fluid inlet that are connected to the shared liquid chamber.

7. The printhead with a three-dimensional curved mixing channel according to claim 1, characterized in that, The droplet ejector includes a droplet forming transducer disposed near the nozzle and a droplet forming waveform source that provides a waveform to the droplet forming transducer.

8. A printing device, characterized in that, include: The device comprises a controller, at least one printhead having a three-dimensional curved mixing channel as described in any one of claims 1-7, two or more liquid reservoirs connected to the printhead and configured to provide two or more different types of liquids, wherein the number of liquid reservoirs is the same as the number of liquid inlets and is arranged in a one-to-one correspondence, and each of the liquid reservoirs is connected to the corresponding liquid inlet via a liquid delivery pipe, wherein the liquid delivery pipe is provided with an inflow control device to control the flow rate of liquid from the liquid reservoirs into the three-dimensional curved mixing channel, and the controller is electrically connected to the droplet ejector and the inflow control device.

9. The printing apparatus as described in claim 8, characterized in that, The device includes two or more printheads with a three-dimensional curved mixing channel as described in any one of claims 1-7, wherein the liquid reservoir is connected to the corresponding liquid inlets of the two or more printheads via the liquid delivery pipeline; the liquid delivery pipeline includes a main pipeline connecting the liquid reservoir and two or more branch pipelines for connecting the main pipeline to the corresponding liquid inlets of the two or more printheads respectively, the main pipeline being equipped with a delivery pump, and the branch pipelines being equipped with high-speed switching solenoid valves for controlling the flow rate of liquid entering the three-dimensional curved mixing channel.

10. A printing control device, characterized in that, include: The printing device as described in claim 8 or 9; The instruction receiving module is configured to receive information about the substrate parameters of the target substrate and the color parameters of the target color. The color processing module is configured to calculate the types and proportions of multiple liquids required to form the target color based on the substrate parameters and the color parameters, and to calculate the flow rate of each liquid based on the configuration parameters of the print head and the proportions of the multiple liquids required. An instruction generation module is configured to generate corresponding control instructions based on the flow rates of the various liquids. The instruction sending module is configured to send the control instruction to the controller so that the controller controls the inflow control device and the droplet ejector to operate.

11. A printing system, characterized in that, include: The cloud server and at least one user terminal connected to the cloud server, and at least one printing device as described in any one of claims 8-9, wherein the cloud server is communicatively connected to the printing device and the user terminal respectively. The user terminal includes an input unit for inputting substrate parameters and color parameters, and a display unit for displaying printing equipment status information. The cloud server receives the substrate parameters and color parameters sent by the user terminal and generates control instructions. The control instructions include the flow rate of each liquid flowing into the three-dimensional curved mixing channel. The control instructions are then sent to the controller of the printing device. At the same time, the server receives the collected printing status information and sends it to the user terminal.

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