An electro-hydrodynamic continuous micro-dot gas-electricity synergic control method and system

Abstract

The application provides a kind of electrofluidic continuous micro dot array gas-electricity collaborative control method and system, it is related to electrofluidic jet printing control technical field, its technical solution main point is: according to the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between the position of nozzle and the position relationship between

Description

Technical Field

[0001] This application relates to the field of electrofluid jet printing control technology, and more specifically, to an electrofluid continuous micro-array pneumatic-electric coordinated control method and system. Background Technology

[0002] Electrofluid jetting technology relies on a high-voltage electric field to induce fluid to form microscale jets or droplets, enabling micron-level precision deposition. It is a crucial processing technology for fabricating micro / nano patterns and functional arrays for strategic emerging industries such as new materials, advanced electronic devices, and high-end precision manufacturing. It can be used for the precision deposition of various materials, including functional pastes, conductive silver pastes, UV adhesives, insulating pastes, and polymer solutions. As related industries increasingly demand miniaturization, arraying, and consistency in batch manufacturing of functional structures, improving the positional accuracy and formation consistency of micro-lattice deposition while maintaining continuous processing efficiency has become a key challenge for the further application of electrofluid jetting equipment in precision manufacturing scenarios.

[0003] In the fabrication of micro-arrays, nozzles are typically mounted on a multi-axis motion platform and move continuously along a predetermined trajectory, sequentially passing through multiple pre-defined spray points. Spraying must be completed point-by-point without the nozzles stopping. Compared to a method where the nozzle stops at each point before spraying, continuous motion improves array processing efficiency. However, the constantly changing nozzle position means the spraying action must be completed within a limited spatial window, placing high demands on the accuracy of the correspondence between the spraying timing and the actual nozzle position.

[0004] In existing electrohydraulic array printing, there is already a control architecture that uses continuous printhead movement combined with a position encoder to trigger jetting. The dot matrix arrangement is achieved by identifying the printhead movement distance and outputting jetting pulses. Simultaneously, there are also unit control methods for the gas path and electric field, such as back pressure liquid supply, negative pressure liquid level adjustment, and high-pressure pulse controlled dripping. In a relatively similar existing solution, the main control software of the electrohydraulic inkjet printer is electrically connected to the high-pressure supply unit and the gas path control unit, respectively. The main control software generates high-pressure control commands and gas path control commands, and the high-pressure electric field and gas path pressure thus form corresponding execution states along their respective control links.

[0005] Specifically, as the nozzle moves continuously along its trajectory, predetermined injection points and transition regions between adjacent injection points exist sequentially along the trajectory. In existing control methods, the position encoder signal is mainly used as injection trigger information, while injection permission, high-voltage electric field state, and gas path pressure state are formed through corresponding control loops. The nozzle's spatial position is not first converted into a position interval state characterizing its current injection stage, nor is a unified gas-electric state combination formed based on this position interval state. Consequently, the same position interval may correspond to different combinations of high-voltage electric field state and gas path pressure state in different injection cycles, making it difficult to stably correspond between the injection position boundary and the actual gas-electric state transition boundary.

[0006] Meanwhile, the high-pressure control link and the gas path control link have different signal processing procedures and execution response characteristics. When the high-pressure electric field state and the gas path pressure state change according to their respective control processes, without a common position interval state as the basis for determining the combined state, even if the two control links can complete their actions independently, the gas-electric coordination relationship within the same spatial interval may still change, leading to accidental spraying, injection window misalignment, point position offset, or inconsistent point shape. For applications such as functional material arrays and precision electronic structures requiring mass production, these differences may also accumulate during continuous processing, affecting the overall consistency of the array and processing stability.

[0007] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0008] The purpose of this application is to provide a method and system for continuous micro-array gas-electric coordinated control of electro-hydraulic fluid, which first determines the positional relationship of the nozzle during continuous movement as a position interval state, then determines the gas-electric joint execution state from the position interval state, and uses the gas-electric joint execution state to uniformly characterize the combination relationship between the high-voltage electric field state and the gas path pressure state, thereby improving the corresponding stability between the injection position boundary and the gas-electric execution state transition.

[0009] This application provides a gas-electric coordinated control method for a continuous micro-array of electro-hydraulic fluids, the technical solution of which is as follows: The position interval state is determined based on the positional relationship between the nozzle position and the preset spray area; the gas-electric combined execution state is determined based on the position interval state, which is composed of a combination of high-voltage electric field state and gas path pressure state; the high-voltage electric field and the gas path pressure acting on the nozzle are controlled according to the gas-electric combined execution state, so that the effective spray interval state corresponds to the gas-electric combined execution state that allows spraying, and the non-spray interval state corresponds to the gas-electric combined execution state that stops spraying and maintains the liquid level state of the nozzle.

[0010] Furthermore, this application proposes that the position interval state can be obtained by comparing the collected nozzle displacement with the pre-stored injection start coordinates and injection end coordinates via hardware circuitry; control signals are generated based on the gas-electric combined execution state to control the high-voltage electric field state and the gas path pressure state, respectively, and the two control signals are connected to the execution end through independent channels. This implementation further implements the determination of the position interval state, the deployment of the gas-electric combined execution state, and the transmission of the two types of execution states in the hardware control link, which helps to reduce the impact of software scheduling and branch crosstalk on the state transition boundary.

[0011] Furthermore, this application proposes that the control signal for controlling the high-voltage electric field state is connected to the high-voltage switching circuit via the high-voltage branch level conversion and electrical isolation module. The high-voltage switching circuit is used to connect or disconnect the path for the high-voltage generating unit to apply high voltage to the nozzle. The level conversion and electrical isolation module includes a digital isolator, a shaping and debounce circuit, and a gate driving circuit arranged in sequence. The high-voltage switching circuit is connected in series between the high-voltage output terminal of the high-voltage generating unit and the nozzle, and is equipped with a surge protection circuit, which has the advantages of improving the quality of the high-voltage trigger signal and the working safety of the high-voltage side.

[0012] Furthermore, this application also proposes that the control signal for controlling the gas path pressure state is connected to the gas path execution unit via an independent solenoid valve drive isolation circuit, and the solenoid valve drive isolation circuit drives the gas path execution unit through optocoupler isolation; the gas path execution unit includes a valve group consisting of a back pressure valve, a pressure relief valve and a negative pressure valve, and the valve group can realize the switching of four gas path pressure states: closing the gas path, introducing a preset back pressure, depressurizing, and introducing a preset negative pressure.

[0013] Furthermore, this application also proposes to pre-set a first preset viscosity, a second preset viscosity, and a third preset viscosity, wherein the first preset viscosity is less than the second preset viscosity, and the second preset viscosity is less than the third preset viscosity; for fluids with a viscosity less than the third preset viscosity, the on / off combination of the back pressure valve, the pressure relief valve, and the negative pressure valve is pre-configured according to the fluid viscosity range, so that different viscosity ranges correspond to different adhesive termination states.

[0014] Furthermore, this application proposes pre-configuring multiple gas-electric co-operation timing modes, selecting the current gas-electric co-operation timing mode based on fluid viscosity and printing requirements. Each gas-electric co-operation timing mode defines the gas-electric joint execution state corresponding to each position interval state and the switching order between adjacent gas-electric joint execution states, and determines the corresponding gas-electric joint execution state based on the current mode and position interval state. Thus, without changing the fundamental control relationship of determining the gas-electric joint execution state based on the position interval state, different specific state contents can be configured for different fluids and printing requirements.

[0015] Furthermore, this application also proposes a pneumatic-electric synchronous start-stop mode. In this mode, the output times of the two types of control signals are preset and compensated according to the mechanical delay of the solenoid valve and the high-pressure response delay, so that the actual transition time of the high-pressure electric field state and the pneumatic pressure state in the pneumatic-electric joint execution state corresponds to the transition boundary of the position interval state.

[0016] Furthermore, this application also proposes a zone back pressure injection plus moving zone negative pressure retraction mode; when the nozzle is within the effective injection zone, the corresponding gas-electric joint execution state is that the high-voltage electric field outputs a high-voltage pulse and the air path is supplied with a preset back pressure; after the nozzle leaves the effective injection zone, the corresponding gas-electric joint execution state switches to the high-voltage electric field being turned off and the air path being supplied with a preset negative pressure, so as to retract the nozzle liquid surface to finish.

[0017] Furthermore, this application also proposes a full-process negative pressure anti-drying standby mode; a gas-electric combined execution state corresponding to the non-injection zone state where the high pressure is turned off and the air path is connected to the preset standby negative pressure; when entering the effective injection zone, the standby negative pressure is turned off and the high-voltage electric field is put into the injection state; after exiting the effective injection zone, the gas-electric combined execution state corresponding to the non-injection zone is restored.

[0018] Furthermore, this application also proposes a continuous micro-array gas-electric coordinated control system, including a position information acquisition module, an injection area storage module, an interval state determination module, a gas-electric coordinated control module, a high-pressure execution unit, and a gas path execution unit; the interval state determination module determines the position interval state, the gas-electric coordinated control module determines the gas-electric joint execution state according to the position interval state, and the corresponding execution units execute the high-pressure electric field state and the gas path pressure state respectively.

[0019] As can be seen from the above, this application first determines the position interval state based on the positional relationship between the nozzle position and the preset spray area, and then determines the corresponding gas-electric combined execution state based on the position interval state. This gas-electric combined execution state is further divided into a high-voltage electric field state and a gas path pressure state, each executed separately. This ensures that the effective spray interval corresponds to the gas-electric combined execution state that allows spraying, and the non-spray interval corresponds to the gas-electric combined execution state that stops spraying and maintains the nozzle liquid surface state. Therefore, the spatial position of the nozzle during continuous movement is no longer merely a single triggering information, but is transformed into a basis for determining the gas-electric combined execution state. This helps reduce spray window misalignment caused by separate high-pressure and gas path decisions, and maintains a controlled nozzle liquid surface state during the movement phase between points, improving the point accuracy and forming consistency of continuous micro-dot matrix printing. Attached Figure Description

[0020] Figure 1 This is a flowchart of the electro-electric co-control method for a continuous micro-array of electro-electric currents proposed in this application.

[0021] Figure 2This is a schematic diagram illustrating the division of the position intervals of the continuous motion trajectory proposed in this application.

[0022] Figure 3 This is a schematic diagram showing the correspondence and switching between the position interval state and the gas-electric combined execution state proposed in this application.

[0023] Figure 4 This diagram illustrates the correspondence between the position interval state and the gas-electric joint execution state under different gas-electric coordinated timing modes.

[0024] Figure 5 This diagram shows the connection between the positive pressure pre-set air path, the negative pressure return air path, the pressure relief path, and the nozzle fluid chamber.

[0025] Figure 6 This is a schematic diagram showing the connection between the back pressure valve, the pressure relief valve, and the negative pressure valve and the nozzle fluid chamber.

[0026] Figure 7 The diagram shows the two control signals corresponding to the combined pneumatic and electric execution state, which are transmitted to the high-pressure execution unit and the pneumatic execution unit through independent isolated drive branches.

[0027] Figure 8 This is a block diagram showing the relationship between the isolation drive, high-voltage switch, and surge protection of the high-voltage branch.

[0028] Figure 9 This is a block diagram of the control valve group controlled by the pneumatic control signal via optocoupler isolation and power drive. Detailed Implementation

[0029] The following description, in conjunction with the technical solution of this application, provides a clearer and more complete explanation of the relevant content. It should be noted that the embodiments described herein are only a part of the implementation methods of this application, and not all of them. Other implementation methods obtained by those skilled in the art based on the embodiments of this application without creative effort should also fall within the protection scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are mainly for distinction and should not be construed as indicating relative importance.

[0030] Reference Figure 1 This application provides a gas-electric coordinated control method for a continuous micro-array of electro-hydraulic fluids, the method comprising: S1. Determine the position interval state based on the positional relationship between the nozzle position and the preset spray area; S2. Determine the combined gas-electric execution state based on the position interval state. The combined gas-electric execution state is composed of a combination of the high-voltage electric field state and the gas pressure state. S3. Control the high-voltage electric field and the gas pressure acting on the nozzle according to the combined gas and electricity execution state, so that the effective injection range state corresponds to the combined gas and electricity execution state that allows injection, and the non-injection range state corresponds to the combined gas and electricity execution state that stops injection and maintains the liquid level state of the nozzle.

[0031] The nozzle position is used to characterize the current spatial position of the nozzle on its continuous motion trajectory, while the preset spray area is used to characterize the spatial range within which dot-matrix spraying is permitted on the motion trajectory. The positional relationship between the two is not limited to a specific acquisition device, coordinate representation method, or comparison circuit; as long as it can be used to distinguish whether the nozzle is currently within the permitted spraying space or the non-spraying space, the corresponding position interval state can be determined.

[0032] The position interval state is a range-based representation of the state derived from the positional relationship between the nozzle's current position and the preset injection area. It is used to transform the nozzle's positional changes along a continuous trajectory into a unified positional basis for subsequently determining the combined pneumatic and electrical execution state. When the nozzle enters the preset injection area from a non-injection area, the position interval state transitions to an effective injection interval state; when the nozzle leaves the preset injection area, the position interval state transitions to a non-injection interval state. Therefore, spatial events involving the nozzle crossing the injection area boundary correspond to explicit position interval state transitions, rather than simply manifesting as an isolated position trigger pulse.

[0033] The combined pneumatic-electric execution state is the execution-side state determined by the position interval state, used to uniformly characterize the current combination relationship formed by the high-voltage electric field state and the pneumatic pressure state. This combined pneumatic-electric execution state is established because the actual injection conditions during electro-hydraulic micro-matrix injection are not solely determined by the high-voltage electric field; the pneumatic pressure state on the nozzle surface also affects the surface morphology during initiation, liquid supply, adhesive disconnection, and non-injection periods. If the high-voltage electric field and pneumatic pressure are formed according to different determination processes, even if they can operate independently, the same position interval may correspond to different combinations. The combined pneumatic-electric execution state is first determined by the position interval state, and then two types of execution components are derived from this state, allowing the high-voltage electric field state and pneumatic pressure state corresponding to the nozzle in a certain position interval to be determined as a whole.

[0034] Specifically, when the nozzle is in the effective spray range, the state of the effective spray range corresponds to the permissible pneumatic-electric combined execution state. This permissible pneumatic-electric combined execution state does not limit the air path to a fixed pressure state. For example, it can be formed by opening a high-voltage electric field in conjunction with back pressure liquid supply, or by opening a high-voltage electric field and closing the air path to form a pure electric field spray state. The specific state can be determined based on fluid characteristics and printing mode. Therefore, what is defined is the correspondence between the effective spray range state and the permissible pneumatic-electric combined execution state, rather than a specific valve state or pressure parameter.

[0035] When the nozzle is in the non-ejection zone, the non-ejection zone state corresponds to the combined pneumatic and electric execution state where injection stops and the nozzle liquid level is maintained. This non-ejection zone is not merely a meaningless blank period between two injection points, but rather corresponds to another type of controlled combined pneumatic and electric execution state. In this state, the high-voltage electric field stops injection, and the gas pressure state allows the nozzle liquid level to remain stable, retract, depressurize, or form other states that prevent unexpected injection and are suitable for the next injection cycle. Thus, after the nozzle leaves the effective injection zone, the combined pneumatic and electric execution state immediately transitions from the injection-side state to the liquid level maintenance-side state, ensuring that the nozzle liquid level is not in a state randomly left over from the previous injection cycle before the next effective injection zone arrives.

[0036] Reference Figure 3 Through the above relationships, the nozzle position, position interval state, and pneumatic-electric combined execution state form a continuous successive relationship. Specifically, the current position interval state is first determined based on the positional relationship between the nozzle position and the preset spray area. Then, the corresponding pneumatic-electric combined execution state is determined based on the position interval state. Finally, the pneumatic-electric combined execution state further determines two execution components: the high-voltage electric field state and the pneumatic pressure state. Figure 3 The upper horizontal line indicates the continuous motion trajectory corresponding to the nozzle position. The left side of the diagram represents the effective injection zone, and the right side represents the non-injection zone. The vertical dashed line indicates the zone boundaries. The unidirectional arrow below the position zone state indicates the gas-electric combined execution state determined based on the position zone state. The bidirectional arrow in the middle indicates the switching relationship between the two types of gas-electric combined execution states. The lower branch arrows indicate the expansion relationship of the corresponding gas-electric combined execution state into the two execution components: the high-voltage electric field state and the gas path pressure state. Figure 3 In the corresponding relationships shown, the gas-electric combined execution state that allows injection corresponds to the high-voltage electric field being turned on and the gas path pressure state that coordinates with the injection; the gas-electric combined execution state that stops injection and maintains the nozzle liquid level corresponds to the high-voltage electric field being turned off and the gas path pressure state used to maintain the nozzle liquid level. Note that coordinating injection does not mean that the gas path must be supplied with a preset back pressure; the aforementioned pure electric field injection state with the gas path closed can still be used. The specific gas path pressure state for maintaining the nozzle liquid level in the non-injection zone is still determined according to the aforementioned fluid characteristics and printing mode.

[0037] Therefore, the high-pressure electric field state and the gas path pressure state are not formed independently of the position interval state, but are determined together as components of the same gas-electric joint execution state. When the nozzle crosses the boundary between the effective injection interval and the non-injection interval, the position interval state changes, and the corresponding gas-electric joint execution state changes accordingly. The high-pressure electric field state and the gas path pressure state are then executed according to the state content and switching relationship specified by the gas-electric joint execution state. This allows for the determination of a specific gas-electric state combination when the same type of position interval recurs, reducing injection boundary misalignment caused by separate decisions for the two branches.

[0038] It should be noted that the gas-electric combined execution state is a state object used in control logic to characterize the combined relationship between the high-voltage electric field state and the gas path pressure state, and does not require a separate physical state storage unit in the specific hardware. In hardware implementation, the correspondence between the pre-determined position interval state and the gas-electric state combination can be used to ensure that once the position interval state is determined, the corresponding two types of target execution states are determined synchronously, thereby constituting the gas-electric combined execution state in the control logic.

[0039] The aforementioned core control relationship does not require that the two types of control signals constituting the combined pneumatic and electric execution state must be output at exactly the same command time. When the high-voltage electric field actuator and the pneumatic actuator have different response characteristics, the output advance or delay of the control signals can be set separately, provided that both originate from the same combined pneumatic and electric execution state, so that the actual state transition time of the two execution components matches the corresponding position interval boundary.

[0040] Reference Figure 2 In one specific embodiment, the printhead moves along a continuous motion trajectory on a multi-axis motion platform to perform electrohydrodynamic micro-dot matrix jet printing. Multiple allowable jet windows are sequentially set on the continuous motion trajectory, each allowable jet window forming a corresponding effective jet section, and a non-jet section is formed between adjacent effective jet sections. Figure 2 P1 to P6 in the diagram are used to indicate multiple spray points on a continuous motion trajectory. The nozzle continuously passes through each effective spray interval and non-spray interval along the direction of motion without needing to start or stop at each spray point. Figure 2 In the diagram, the horizontal solid line with an arrow indicates the continuous motion trajectory, and the arrow indicates the direction of nozzle movement; the vertical dashed lines on both sides of each spray point indicate the boundary of the corresponding effective spray range; the double-headed arrows above the trajectory indicate the corresponding effective spray range, and the double-headed arrows below the trajectory indicate the non-spray range between adjacent effective spray ranges.

[0041] In this embodiment, the grating encoder tracks the nozzle displacement in real time along the motion axis. The spray start coordinates and spray end coordinates are pre-stored in the hardware position comparison circuit. The hardware position comparison circuit compares the real-time nozzle displacement with the spray start coordinates and spray end coordinates respectively. When the nozzle displacement is between the spray start coordinates and spray end coordinates, it outputs a range determination result to characterize the effective spray range state. When the nozzle displacement is outside the aforementioned coordinates, it outputs a range determination result to characterize the non-spray range state. The range determination result is a specific signal representation of the position range state.

[0042] When using a hardware position comparison circuit, the determination of positional relationships does not rely on the main control software continuously performing position calculations and task scheduling during nozzle movement. This allows the position interval state to change promptly as the nozzle crosses the preset spray area boundary, helping to reduce response delays and timing jitter introduced by software processing cycles. This hardware comparison method is a specific implementation of the position interval state determination process and does not change the basic control relationship of determining the position interval state based on positional relationships, and determining the pneumatic-electric combined execution state based on the position interval state.

[0043] Furthermore, in this specific embodiment, two control signals are generated based on the gas-electric combined execution state determined by the position interval state, corresponding to the high-voltage electric field state and the gas path pressure state, respectively. These two control signals are then connected to their respective execution terminals via independent channels. Each control signal carries one execution component within the gas-electric combined execution state, and their target state originates from the same gas-electric combined execution state. The signal transmission and execution processes are independent of each other.

[0044] Therefore, while maintaining consistency in the gas-electric state combination relationship, the possibility of electromagnetic interference generated by high-voltage pulses, motor drives, and solenoid valve power switching propagating between the two types of control links can be reduced.

[0045] In a preferred embodiment, the pressure amplitude corresponding to each air path pressure state is preset before the printing task begins. When an air path enters the corresponding pressure state, the preset pressure amplitude is maintained during the duration of that state, without continuously changing the pressure magnitude according to the real-time position of the printhead; the printhead position and its corresponding position interval state are mainly used to determine the timing of switching air path pressure states.

[0046] Therefore, the pneumatic control can establish a control relationship where the pressure amplitude is predetermined and the pneumatic pressure state switches according to the position interval, ensuring relatively stable pressure conditions for the same pneumatic pressure state in different injection cycles. This pressure amplitude preset method is a preferred method at the specific implementation level of the pneumatic state and does not change the fundamental relationship between the position interval state and the pneumatic-electric joint execution state.

[0047] In one specific embodiment, the gas path pressure state includes at least one of closing the gas path, introducing a preset back pressure, depressurizing, and introducing a preset negative pressure. When the preset back pressure is introduced, the gas path applies positive gas pressure to the nozzle fluid cavity to maintain liquid supply or to cooperate with the high-voltage electric field to complete fluid injection; when depressurizing, the nozzle-side gas path is connected to the atmosphere or a pressure relief passage to relieve the continuous liquid supply pressure on the nozzle fluid cavity; when the preset negative pressure is introduced, the gas path applies reverse gas pressure to the nozzle fluid cavity to cause the nozzle liquid surface to retract or to draw back the residual fluid in the nozzle; when the gas path is closed, no pressure supply passage is formed between the nozzle fluid cavity and the corresponding pressure source.

[0048] Furthermore, the two control signals generated under the combined pneumatic and electric execution state are connected to the execution end through independent channels: the first control signal corresponding to the high-voltage electric field state is connected to the high-voltage switch circuit via the level conversion and electrical isolation module of the high-voltage branch; the second control signal corresponding to the pneumatic pressure state is connected to the pneumatic execution unit via an independent solenoid valve drive isolation circuit. The actual output time of the two control signals can be further preset and compensated based on the response delay of the corresponding actuator.

[0049] Reference Figure 7 In a specific implementation using hardware position comparison and dual-path independent drive, the hardware position comparison circuit first outputs the interval determination result to characterize the position interval state. The gas-electric coordinated control logic determines the corresponding gas-electric joint execution state based on the position interval state, and the gas-electric joint execution state forms a first control signal and a second control signal corresponding to the high-voltage electric field state and the gas path pressure state, respectively. Figure 7 The transmission and execution relationship of the two control signals after they are deployed from the combined pneumatic and electric execution state into the high-pressure branch and the pneumatic branch, respectively, is further illustrated. Figure 7 In the diagram, the upper dashed box indicates the high-pressure branch, and the lower dashed box indicates the gas branch; the two dashed boxes are used to distinguish the signal processing and execution paths corresponding to the two control signals.

[0050] In dynamic dot matrix operation with high-speed continuous movement of the nozzles, the motor drive, high-voltage pulse electric field, and solenoid valve power switching of the multi-axis motion platform can operate simultaneously. The different power levels and response characteristics of the actuators place the control system in a strong electromagnetic interference environment. If the high-pressure branch and the air circuit branch share a common signal processing link, interference generated by the high-pressure switch, motor drive, or solenoid valve operation may couple to the control signal through the shared line or shared processing stage, leading to signal edge jitter, timing deviation, false triggering, or missed triggering.

[0051] In this regard, such as Figure 7As shown, in this embodiment, after the combined pneumatic and electrical execution state forms two execution components, the two execution components are transmitted through independent control branches. The first control signal enters the level conversion and electrical isolation module of the high-voltage branch, and after processing by this module, it drives the high-voltage switching circuit in the high-voltage execution unit; the second control signal enters an independently set solenoid valve drive isolation circuit, and after processing by this circuit, it drives the pneumatic execution unit. Although the two branches originate from the same combined pneumatic and electrical execution state, they do not share the corresponding signal processing module in the subsequent control signal processing, thereby maintaining the consistency of the pneumatic and electrical state combination relationship and the independence of the transmission process of the two branches. Figure 7 The nozzles marked at the ends of the two branches are the same nozzles, indicating the electrical connection between the high-pressure branch and the nozzle, and the pneumatic connection between the pneumatic branch and the nozzle.

[0052] in, Figure 7 The high-voltage actuator is a functional unit that executes the state of the high-voltage electric field; in Figure 8 In the specific implementation shown, the high-voltage actuator includes a high-voltage generating unit and a high-voltage switching circuit. The control signal of the high-voltage branch is used to control the on and off of the high-voltage switching circuit. The high-voltage generating unit, as the source of high-voltage energy, has its high-voltage output terminal connected to the nozzle electrode via the high-voltage switching circuit to selectively apply high voltage to the nozzle electrode. Therefore, the signal transmission path of the high-voltage control signal and the power transmission path of the high-voltage energy are distinct: the first control signal reaches the control terminal of the high-voltage switching circuit along the weak current control path, while the high-voltage energy output by the high-voltage generating unit reaches the nozzle via the main power path of the high-voltage switching circuit.

[0053] In parallel, the second control signal enters the pneumatic actuator unit via an independent solenoid valve drive isolation circuit. The pneumatic actuator unit controls the corresponding valve to operate according to the target pneumatic pressure state represented by the second control signal, thereby changing the connection between the nozzle fluid chamber and the positive pressure air source, negative pressure air source, or pressure relief passage.

[0054] At the signal link level, the high-pressure branch and the pneumatic branch are each configured with their own signal processing and isolation components, enabling the two types of control signals to reach the corresponding execution units along different control paths after unfolding from the combined pneumatic and electric execution state. As a further implementation, the two control links can be routed separately on the circuit board. The position acquisition weak current side, the high-pressure drive side, the pneumatic control weak current side, and the valve group power side can each be provided with corresponding reference grounds, and interference coupling between different areas can be reduced through electrical isolation and shielded wiring.

[0055] Through the above structure, the combined pneumatic-electric execution state first ensures the consistency of the high-voltage electric field state and the pneumatic pressure state at the control target level. Then, two independent drive links ensure the reliable transmission of the two execution components. Under conditions where high-speed motion, high-voltage pulses, and solenoid valve power switching coexist, the mutual interference between the high-voltage branch and the pneumatic branch, as well as the possibility of power-side interference propagating backward to the position determination and control sides, can be reduced. This improves the stability of the correspondence between the position interval state, the combined pneumatic-electric execution state, and the actual execution state.

[0056] Reference Figure 8 In some preferred embodiments, the high-voltage branch level conversion and electrical isolation module includes a digital isolator, a shaping and debounce stage, and a gate driving stage arranged sequentially along the high-voltage control signal transmission direction. The gate driving stage is used to drive the high-voltage switching stage. The high-voltage switching stage is connected in series between the high-voltage output terminal of the high-voltage generating unit and the nozzle, and is equipped with a surge protection stage.

[0057] Specifically, the high-voltage electric field state determined by the combined gas-electric operation generates a corresponding high-voltage control signal. This high-voltage control signal first enters the digital isolator through a current-limiting circuit. The digital isolator is positioned between the low-voltage control side and the high-voltage drive side to establish an electrical isolation boundary between the two sides. This allows control information to be transmitted across the isolation boundary while reducing the possibility of common-mode interference, ground potential fluctuations, and switching interference from the high-voltage drive side being transmitted back to the low-voltage control side along the control link. Figure 8 The vertical dashed line in the diagram illustrates the electrical isolation boundary between the low-voltage control side and the high-voltage drive side. The left side of the dashed line shows the input portion of the high-voltage control signal, and the right side shows the drive execution portion, which consists of a shaping and debouncing stage, a gate drive stage, and a high-voltage switching stage. The input side of the digital isolator receives the control signal from the low-voltage control side, and its output side transmits the isolated control signal to the high-voltage drive side. The vertical dashed line is a schematic marker of the isolation relationship and does not indicate any additional isolation devices.

[0058] The control signal output from the digital isolator enters the shaping and debouncing stage, which normalizes the rising and falling edges of the control signal and suppresses edge jitter generated during signal transmission. The normalized control signal then enters the gate drive stage, which enhances the driving capability of the control signal to drive the high-voltage switching device to quickly complete the turn-on and turn-off.

[0059] like Figure 8As shown, the high-voltage generating unit is a high-voltage energy source, and its high-voltage output terminal is connected to the main power path of the high-voltage switching circuit; the control terminal of the high-voltage switching circuit is connected to the gate drive circuit. Thus, the high-voltage control signal forms a control signal path along the digital isolator, the shaping and debouncing circuit, and the gate drive circuit, while the high-voltage energy output from the high-voltage generating unit forms a high-voltage energy path along the main power path of the high-voltage switching circuit. Under the action of the high-voltage control signal, the high-voltage switching circuit selectively turns on or off, selectively applying the high voltage output from the high-voltage generating unit to the nozzle electrode, thereby forming a high-voltage pulse electric field corresponding to the target high-voltage electric field state.

[0060] High-voltage switching circuits can also be configured with surge protection circuits to clamp or discharge transient overshoots generated during repeated switching on and off of high-voltage switching devices, thereby reducing the impact of switching transients on high-voltage switching devices.

[0061] In a specific example, the digital isolator can be a digital isolator with an isolation withstand voltage in the range of 5000Vrms; the shaping and debouncing stage can use a Schmitt trigger-type shaping device; the gate drive stage can use a gate driver with a peak drive current in the range of 4A; the high-voltage switching stage can use a high-voltage MOSFET with a withstand voltage in the range of 1000V; and the surge protection stage can use a transient voltage suppression device. The high-voltage control signal on the weak current side can also be connected to the input of the digital isolator via a current-limiting resistor in the range of 330 ohms. The above device parameters and device types are only used to illustrate one specific implementation method and do not limit the use of other devices with equivalent functions in each functional stage.

[0062] In one optional layout, the low-voltage control side and the high-voltage drive side can be provided with mutually isolated reference grounds, and the signal routing area of ​​the high-voltage branch can also be provided with a shielded isolation area to further reduce the impact of electromagnetic interference generated by high-voltage switches, motor drives and other power devices on the high-voltage control signal.

[0063] Through the aforementioned high-voltage branch structure, the high-voltage electric field state determined by the combined gas-electric execution state can be reliably converted into the actual on / off state of the high-voltage switching circuit after isolation, shaping, and driving. On the one hand, digital isolation and shaping / debouncing help maintain the edge integrity and timing stability of the control signal; on the other hand, the gate driving circuit helps improve the on / off speed of the high-voltage switching device, while the surge protection circuit reduces transient overshoot during repeated switching of the high-voltage switching device, thereby making the actual high-voltage electric field state more stably correspond to the high-voltage electric field state specified by the combined gas-electric execution state.

[0064] Reference Figure 9In some preferred embodiments, the pneumatic pressure state determined by the combined pneumatic and electro-pneumatic execution state generates a corresponding pneumatic control signal. This pneumatic control signal is then connected to the pneumatic execution unit via an independently configured solenoid valve drive isolation circuit. The solenoid valve drive isolation circuit includes an optocoupler isolation link located between the weak current side of the pneumatic control and the power side of the valve group, as well as a power drive link located on the power side of the valve group. This allows pneumatic control information to be transmitted to the valve group across the electrical isolation boundary, while simultaneously reducing the possibility of electrical disturbances generated by the power switching of the solenoid valve coil being transmitted back along the control line to the weak current side of the pneumatic control. Figure 9 In the diagram, the upper dashed box indicates the input section of the pneumatic control system on the low-voltage side, and the lower dashed box indicates the drive and execution section of the valve group on the power side. The separator between the two sections illustrates the electrical isolation achieved by the optocoupler isolation link. Arrows crossing this separator indicate the transmission of pneumatic control information to the power drive link. Arrows from the power drive link pointing to the back pressure valve V1, pressure relief valve V2, and negative pressure valve V3 respectively indicate the drive relationship to the corresponding valves. The pneumatic path and the resulting pneumatic pressure state corresponding to each valve are explained by the valve group on / off combinations below.

[0065] Specifically, the pneumatic control signal can first be connected to the input side of the optocoupler via a current-limiting resistor. The optocoupler isolation stage then completes the electrical isolation between the weak current side of the pneumatic control and the power side of the valve group. The output side of the optocoupler then sends the isolated control signal to the power drive stage, which drives the corresponding solenoid valves in the valve group. As a specific implementation, the optocoupler isolation can use multi-channel optocouplers with an isolation withstand voltage on the order of 5000Vrms. The power drive stage can use a Darlington array, and a freewheeling structure can be set in the power drive stage to provide a discharge path for the energy stored when the solenoid valve coil is de-energized. The above device configuration is only for illustrating one specific implementation method; other devices with corresponding isolation and drive functions can also be used.

[0066] Reference Figure 5 and Figure 6 The pneumatic actuator may include a back pressure valve V1, a pressure relief valve V2, and a negative pressure valve V3. These three valves create different pneumatic pressure states by altering the connection between each pressure path and the nozzle fluid chamber. Specifically, when the positive pressure path corresponding to the back pressure valve V1 is open while other pressure paths are closed, a preset back pressure is introduced into the nozzle fluid chamber; when the pressure relief path corresponding to the pressure relief valve V2 is open while both the positive and negative pressure paths are closed, the nozzle fluid chamber is connected to the atmosphere or the pressure relief path to relieve the liquid supply pressure; when the negative pressure path corresponding to the negative pressure valve V3 is open while other pressure paths are closed, a preset negative pressure is introduced into the nozzle fluid chamber; when the valve assembly is in a combined state where neither the nozzle fluid chamber nor the corresponding pressure source forms a pressure supply path, the pneumatic circuit is closed.

[0067] Here, the valve group status is used to characterize the conduction or cutoff relationship of the corresponding air passage, and is not limited to the energization or de-energization of the solenoid valve coil as the status definition. As a specific device configuration, the back pressure valve and negative pressure valve can be normally closed valves, and the pressure relief valve can be normally open valves. In this configuration, the electric drive state of the valve can be converted into the corresponding air passage state according to the normally open or normally closed attribute of the valve. Therefore, whether the valve adopts a normally open or normally closed form does not change the four types of air passage pressure states: closing the air passage, introducing preset back pressure, relieving pressure, and introducing preset negative pressure.

[0068] Reference Figure 5 To establish preset back pressure, preset negative pressure, and pressure relief states, the pneumatic actuator can be connected to a positive pressure preset pneumatic path, a negative pressure back suction pneumatic path, and a pressure relief path. The positive pressure preset pneumatic path can be formed by sequentially connecting an air source, a filter, a precision pressure regulating valve, and an air tank. The precision pressure regulating valve adjusts the air source pressure to the preset back pressure amplitude, and the air tank stabilizes the air supply pressure. The negative pressure back suction pneumatic path can use compressed air in conjunction with a Venturi negative pressure generator to create a preset negative pressure. The pressure relief path allows the nozzle fluid chamber to selectively connect to the atmosphere or other low-pressure relief terminals. Figure 5 and Figure 6 The connecting lines in the diagram indicate the connection between gas circuit components, but do not indicate the actual flow direction of the gas under each operating condition. Under the condition of depressurizing to the atmosphere, the nozzle fluid chamber is connected to the atmosphere through the pressure relief valve V2 to relieve the continuous positive liquid supply pressure in the chamber.

[0069] In a preferred embodiment, the pressure amplitudes corresponding to the positive pressure preset air path and the negative pressure back suction air path are preset before the printing task begins, and the preset amplitudes are maintained during the duration of the corresponding air path pressure state. During operation, the connection between the nozzle fluid chamber and each pressure path is changed mainly by the valve assembly to achieve the switching between different air path pressure states. Thus, the process of presetting the pressure magnitude and the process of switching the pressure state interval are distinguished from each other, so that the position interval state mainly determines when to switch the air path pressure state, while the pressure conditions within the corresponding state remain relatively stable.

[0070] From the perspective of the interaction between the nozzle and the liquid surface, closing the air path reduces the continuous effect of external airflow on the nozzle's liquid surface; introducing a preset back pressure can maintain liquid supply, preserve a steady-state curved liquid surface, or cooperate with a high-voltage electric field to complete the injection; depressurization relieves the continuous positive liquid supply pressure on the nozzle's fluid cavity; introducing a preset negative pressure can cause the nozzle's liquid surface to retract into the nozzle or draw back the residual fluid after injection. The pressure states of different air paths are determined by the combined pneumatic and electric execution state based on the current position interval state and the selected pneumatic and electric coordination timing mode.

[0071] Furthermore, in some preferred embodiments, a first preset viscosity, a second preset viscosity, and a third preset viscosity are preset, wherein the first preset viscosity is less than the second preset viscosity, and the second preset viscosity is less than the third preset viscosity; in this embodiment, the third preset viscosity is used to limit the applicable viscosity range for the following graded adhesive breakage control.

[0072] For fluids with a viscosity less than the third preset viscosity, the on / off combinations of the back pressure valve, pressure relief valve, and negative pressure valve are pre-configured according to the viscosity range of the fluid. When the nozzle exits the effective spray range to cut off the adhesive, the corresponding on / off combinations of the control valve group are executed according to the viscosity range of the current fluid: when the viscosity is less than the first preset viscosity, the back pressure valve is open, and the pressure relief valve and negative pressure valve are closed, and the air path maintains the preset back pressure; when the viscosity is greater than or equal to the first preset viscosity and less than the second preset viscosity, the pressure relief valve is open, and the back pressure valve and negative pressure valve are closed, and the air path is depressurized; when the viscosity is greater than or equal to the second preset viscosity and less than the third preset viscosity, the negative pressure valve is open, and the back pressure valve and pressure relief valve are closed, and the air path is supplied with the preset negative pressure to back-suction the residual fluid in the nozzle.

[0073] The valve assembly described above has the ability to switch between four states: closing the air path, introducing a preset back pressure, depressurizing, and introducing a preset negative pressure. However, at the final moment when the nozzle exits the effective spray range to cut off the glue, the requirements for the air path state are different for fluids of different viscosities.

[0074] Specifically, if a low-viscosity fluid loses back pressure support after adhesive cut-off, the nozzle liquid surface is prone to instability, leading to abnormal liquid supply when starting spraying in the next cycle. If a medium-viscosity fluid continues to supply liquid pressure in the air circuit after adhesive cut-off, the fluid will continue to seep out at the nozzle, forming overflow accumulation. High-viscosity fluids, due to their strong cohesive force, are prone to residual fluid remaining at the nozzle orifice at the moment of adhesive cut-off and being pulled out with the movement of the nozzle head, forming tailing and stringing, contaminating the edges of the dot matrix. In other words, a single fixed adhesive cut-off valve state is difficult to adapt to fluids with a wide viscosity range at the same time.

[0075] In this embodiment, before operation, a first preset viscosity, a second preset viscosity, and a third preset viscosity are preset. The first preset viscosity is less than the second preset viscosity, and the second preset viscosity is less than the third preset viscosity. The on / off combinations of the three valves at the time of discontinuation are pre-configured according to the viscosity range of the fluid, forming a correspondence between the viscosity range and the valve state combination. During operation, when the range determination result indicates that the nozzle has exited the effective spray range, the valve group is controlled to execute the on / off combination corresponding to the current viscosity range of the fluid.

[0076] In a specific example, the first preset viscosity can be 2000 mPa·s, the second preset viscosity can be 50000 mPa·s, and the third preset viscosity can be 80000 mPa·s. For fluids with a viscosity less than the first preset viscosity, such as low-viscosity inks with a viscosity greater than or equal to 500 mPa·s and less than 2000 mPa·s, when the adhesive is cut off, the back pressure valve is activated, and the pressure relief valve and negative pressure valve are deactivated. The air circuit maintains the preset back pressure, and the nozzle liquid surface maintains a stable feeding state under the support of the back pressure, which helps to ensure that the initial state of the liquid surface is consistent when the next spraying cycle starts. For fluids with a viscosity greater than or equal to the first preset viscosity and less than the second preset viscosity, such as conventional functional slurries with a viscosity greater than or equal to 2000 mPa·s and less than 50000 mPa·s, when the adhesive is cut off, the pressure relief valve is turned on, the back pressure valve and the negative pressure valve are turned off, the nozzle is vented to the atmosphere through the pressure relief passage, the liquid supply pressure is relieved, and the fluid loses the power to continuously flow outward, which helps to avoid material overflow after the adhesive is cut off. For fluids with a viscosity greater than or equal to the second preset viscosity and less than the third preset viscosity, such as high-viscosity slurries that are prone to tailing and have a viscosity greater than or equal to 50,000 mPa·s and less than 80,000 mPa·s, when the adhesive is cut off, the negative pressure valve is briefly turned on, the back pressure valve and the pressure relief valve are turned off, and the air path is briefly introduced with the preset negative pressure to draw back and shear the residual fluid stuck at the nozzle orifice, which helps to eliminate tailing, stringing and burrs on the outer edge of the dot matrix.

[0077] It should be noted that for fluids with a viscosity greater than or equal to the second preset viscosity and less than the third preset viscosity, the negative pressure valve adopts short-term conduction. The conduction time can be preset according to the needs of residual fluid reabsorption. Short-term conduction means that the negative pressure only works at the moment of glue cut-off and is removed after the reabsorption is completed, so as to avoid the negative pressure from continuously acting and drawing too much fluid back into the nozzle.

[0078] Pre-configuring on / off combinations according to viscosity ranges is because the end state of glue cut-off directly determines the initial liquid surface conditions of the next spraying cycle; the glue cut-off moment only needs to be executed according to the current viscosity range, without the need for temporary calculations during the high-speed movement of the nozzle.

[0079] In one alternative implementation, the back pressure valve can be normally closed, the pressure relief valve can be normally open, and the negative pressure valve can be normally closed. This ensures that the nozzle is vented to the atmosphere via the pressure relief path by default in the power-off or non-driven state, preventing accidental pressurization. The valve assembly can be driven by the three outputs of a Darlington array, which can have a built-in freewheeling diode to absorb the reverse induced voltage generated when the valve coil is de-energized. Regarding the gas path, positive pressure can be preset by connecting the gas source to the gas tank via a filter and a precision pressure regulating valve, while negative pressure can be generated by compressed air flowing through a Venturi negative pressure generator. The above gas path structure and component selection are merely examples and do not affect the control rule itself of executing on / off combinations according to viscosity range.

[0080] In this embodiment, the negative pressure back suction is a short-term finishing action on the residual fluid in the nozzle at the moment of glue cut-off. This differs from the complete timing mode described later, in which negative pressure is continuously introduced throughout the entire non-spraying range after the nozzle exits the effective spraying range to retract and finish the liquid surface. The timing of this action and the control logic are different.

[0081] By using the on / off combinations pre-configured according to the viscosity range, the gas path termination state at the moment of glue cut-off can be matched with the fluid viscosity. This helps to avoid problems such as liquid surface instability at low viscosity, overflow at medium viscosity, and tailing and stringing at high viscosity when using a single fixed valve state. It also makes the nozzle liquid surface state more consistent after each glue cut-off termination, which is beneficial to the reproducibility of the forming quality of adjacent cycles in continuous dot matrix printing.

[0082] In the aforementioned embodiments, the position interval state is used to determine the combined gas-electric execution state, such that the effective injection interval state corresponds to the combined gas-electric execution state that allows injection, and the non-injection interval state corresponds to the combined gas-electric execution state that stops injection and maintains the nozzle liquid level.

[0083] However, on this platform, the correspondence between the state of each position interval and the specific gas-electric combined execution state can still be configured differently. That is, under different fluids and different printing requirements, the high pressure and gas path can be coordinated in the jetting state, and the liquid level can be maintained in the non-jetting state. It does not have to be a fixed combination.

[0084] For low-viscosity fluids, the intervention of air pressure can easily induce dripping and dispersion; for high-viscosity slurries, the lack of proper air pressure can easily lead to insufficient liquid output and drip interruption; at the same time, different working conditions such as anti-dripping, uniform and stable spraying, glue interruption and anti-tailing, and long-term anti-drying require different specific contents of the gas-electric combined execution state and the transition sequence at the interval boundary.

[0085] In this regard, refer to Figure 4 This application further establishes multiple gas-electric coordinated timing modes based on the fundamental control relationship for determining the gas-electric joint execution state according to the position interval state. The correspondence here refers to the fact that, after selecting a gas-electric coordinated timing mode, the combination of the high-voltage electric field state and the gas path pressure state is determined by the position interval state, thus determining the gas-electric joint execution state. Different gas-electric coordinated timing modes do not change the control basis of the position interval state, but rather specify which gas-electric joint execution state corresponds to the effective injection interval state and the non-injection interval state, and according to what state content and timing relationship the two execution components of the high-voltage electric field state and the gas path pressure state switch when the position interval state crosses the interval boundary.

[0086] Specifically, the gas-electric coordinated timing mode can be understood as a pre-configured set of position interval states—gas-electric joint execution states—execution component switching relationships. Each mode defines at least: the gas-electric joint execution state corresponding to the effective injection interval state; the gas-electric joint execution state corresponding to the non-injection interval state; and the switching relationship between the two gas-electric joint execution states when the two position interval states transition to each other. Therefore, once a certain mode is determined, when the nozzle moves along a continuous motion trajectory, the corresponding gas-electric joint execution state can be determined only based on the current position interval state, without needing to recalculate the combination of high pressure and gas path at each injection point. Figure 4 In the diagram, Z1 and Z0 represent the effective injection zone state and the non-injection zone state, respectively. Each bracket contains the high-pressure electric field state and the gas path pressure state, respectively. H1 indicates the high-pressure electric field is on, and H0 indicates the high-pressure electric field is off; G0 indicates the gas path is off; Gb indicates the preset back pressure is applied; Gc indicates the preset critical back pressure is maintained; Gn indicates the preset negative pressure is applied; Gs1 indicates the preset standby negative pressure is applied and maintained; Gs0 indicates the preset standby negative pressure is off. The bidirectional arrows in the diagram indicate the switching relationship between the two gas-electric joint execution states when the position zone state changes; the above symbols are for illustrative purposes only and do not represent additional hardware units.

[0087] Figure 4 (a) to (e) respectively illustrate the pure electric field pulse injection mode, the full-range critical back pressure stabilization plus interval pulse injection mode, the gas-electric synchronous start-stop mode, the interval back pressure injection plus moving interval negative pressure retraction mode, and the full-range negative pressure anti-drying standby mode. In the pure electric field pulse injection mode, the effective injection interval state corresponds to the gas-electric joint execution state where the high-voltage electric field is on and the gas path is closed, and the non-injection interval state corresponds to the gas-electric joint execution state where the high-voltage electric field is off and the gas path is closed. In the full-range critical back pressure stabilization plus interval pulse injection mode, the effective injection interval state corresponds to the gas-electric joint execution state where the high-voltage electric field is on and the gas path maintains a preset critical back pressure, and the non-injection interval state corresponds to the gas-electric joint execution state where the high-voltage electric field is off and the gas path continues to maintain the preset critical back pressure. Figure 4In the pneumatic-electric synchronous start-stop mode shown in (c), the effective injection zone state corresponds to the pneumatic-electric joint execution state where the high-voltage electric field is turned on and the air path is supplied with a preset back pressure, and the non-injection zone state corresponds to the pneumatic-electric joint execution state where the high-voltage electric field is turned off and the air path is closed; in the zone back pressure injection plus moving zone negative pressure retraction mode, the effective injection zone state corresponds to the pneumatic-electric joint execution state where the high-voltage electric field is turned on and the preset back pressure is supplied, and the non-injection zone state corresponds to the pneumatic-electric joint execution state where the high-voltage electric field is turned off and the preset negative pressure is supplied; in the full-process negative pressure anti-drying standby mode, the non-injection zone state corresponds to the pneumatic-electric joint execution state where the high-voltage electric field is turned off and the preset standby negative pressure is maintained, and when the nozzle enters the effective injection zone, the standby negative pressure is turned off and the high-voltage electric field enters the injection state, and the standby negative pressure is restored after the nozzle exits the effective injection zone again.

[0088] The different modes mentioned above can be selected based on the viscosity characteristics of the fluid to be ejected and specific printing requirements. Low-viscosity fluids are more sensitive to air pressure disturbances, so the mode that reduces or avoids positive air pressure intervention can be prioritized; medium-viscosity fluids can use the mode of maintaining the liquid level with critical back pressure and combined with interval high-pressure pulses; medium-to-high viscosity fluids or fluids prone to tailing can use the mode of positive back pressure during the ejection phase and negative pressure retraction during the non-ejection phase; for long-term continuous printing or standby anti-drying requirements, the mode of continuous negative pressure protection in the non-ejection interval can be used. The above correspondence is used to illustrate the basis for mode selection and does not limit a certain viscosity range to using only one mode.

[0089] In one implementation, a current pneumatic-electric co-operation timing mode can be selected from a pre-configured set of modes before the printing task begins, based on the current fluid and printing requirements. This mode remains unchanged during the execution of the printing task, thereby improving the repeatability of state switching relationships under the same operating conditions. In other implementations, different pneumatic-electric co-operation timing modes can also be combined and used according to pre-set printing stages or operating condition requirements, so that different stages in the same printing task adopt the corresponding correspondence and switching relationship between the position interval state and the pneumatic-electric co-operation state. Regardless of whether a single mode or a combination of multiple modes is used, the common basis is: the nozzle position relationship first determines the position interval state, and then the position interval state determines the corresponding pneumatic-electric co-operation state under the correspondence specified by the current mode.

[0090] In the gas-electric coordinated timing mode requiring stable pressure conditions, the pressure amplitudes of back pressure, negative pressure, or standby negative pressure can be preset before operation and maintained during the corresponding gas path pressure state. The position interval state mainly controls the timing of gas path pressure state switching. Thus, mode switching changes which specific gas-electric coordinated execution state corresponds to different position interval states and how gas-electric coordinated execution states switch between each other, without changing the basic control level from the position interval state to the gas-electric coordinated execution state.

[0091] Furthermore, in some of these methods, the current gas-electric coordinated timing mode is a gas-electric synchronous start-stop mode. The effective injection interval state corresponds to the gas-electric joint execution state where both the high-pressure electric field and the gas path pressure enter the injection state, and the non-injection interval state corresponds to the gas-electric joint execution state where both exit the injection state; according to the preset timing compensation of the solenoid valve mechanical delay and the high-pressure response delay, the actual transition time of the two types of execution components corresponds to the transition boundary of the position interval state.

[0092] In the aforementioned multi-mode gas-electric coordinated timing system, the gas-electric synchronous start-stop mode is one of the selectable modes, primarily suitable for high-precision array molding of conventional viscosity slurries. In this mode, when the nozzle enters the effective injection zone, the position zone state transitions to the effective injection zone state, and a corresponding gas-electric joint execution state is determined: the high-pressure branch outputs a high-pressure pulse, and the gas branch simultaneously activates the preset back pressure. After the nozzle leaves the effective injection zone and enters the non-injection zone, the position zone state transitions to the non-injection zone state, and another gas-electric joint execution state is determined: the high-pressure electric field is turned off, and the gas branch closes the back pressure supply path. The two branches can execute the corresponding components of the gas-electric joint execution state based on the aforementioned dual-path independent drive architecture. Here, closing the gas path refers to closing the pressure supply path, which differs from the pressure relief state achieved by releasing pressure within the nozzle fluid chamber through a pressure relief path.

[0093] It is worth noting that even if the two branches receive the switching command simultaneously, their actual action times are unlikely to coincide naturally. Specifically, the solenoid valve in the pneumatic branch is a mechanically actuated device, and the valve core has an inherent mechanical response time from receiving the drive signal to completing the opening and closing action, i.e., the solenoid valve mechanical delay; while the establishment of the high-voltage electric field in the high-voltage branch mainly relies on the electrical response, and its establishment and removal speed is usually faster than the mechanical action of the valve body.

[0094] If the control signals of the two switches are output simultaneously at the original triggering time of the interval determination result, the electric field force often takes place before the back pressure at the starting point of entering the effective spraying interval, or the back pressure supply stops and the high voltage electric field is turned off at the same time when leaving the interval. The actual action times of the two branches are staggered, the gas-electric timing cannot be superimposed, and the liquid point boundary is prone to overflow or irregular molding.

[0095] To address this, this method performs preset timing compensation on the output times of the two switch control signals based on the solenoid valve's mechanical delay and the high-pressure response delay. The compensation amount can be preset based on the difference between the solenoid valve's mechanical delay and the high-pressure response delay. The specific value can be obtained by calibrating the valve body's mechanical action time and the high-pressure branch's response time. The direction of compensation is to advance or offset the output times of the two signals relative to the original trigger times of the interval determination results by a corresponding preset amount. For example, the signal of the slower-acting pneumatic branch can be output earlier to give the slower-acting branch time to catch up.

[0096] The specific means of compensation can be achieved by using hardware delay circuits or pre-written timing parameters; this method does not limit either approach. After compensation, although the output times of the two commands are no longer the same, the actual transition times of the high-voltage electric field state and the gas pressure state are basically aligned on the time axis. The synchronous opening within the interval and the synchronous closing outside the interval are implemented from synchronization at the command level to synchronization at the action level.

[0097] Therefore, the back pressure supply at the starting point of the spraying zone matches the establishment time of the high-voltage electric field, and the back pressure supply at the ending point matches the shutdown time of the high-voltage electric field. The liquid droplet boundaries are clean and regular with no excess material overflow. The consistency of the dot matrix formation is further improved compared with the scheme without time compensation, which helps to meet the needs of high-precision array preparation of conventional viscosity slurries.

[0098] Furthermore, in some preferred embodiments, the current gas-electric coordinated timing mode is a range back pressure injection plus moving range negative pressure retraction mode; When the nozzle is within the effective spray range, the air pressure is a preset back pressure, which, together with the high-voltage pulse output from the high-voltage electric field, completes the spraying. After the nozzle exits the effective spray range, the air pressure immediately switches to a preset negative pressure to retract the liquid level in the nozzle and finish spraying.

[0099] This mode is primarily designed for medium to high viscosity fluids that are prone to stringing and tailing. These fluids have high viscosity, and the residual fluid at the nozzle at the end of spraying is difficult to break up quickly enough due to its own surface tension. As the nozzle continues to move, the residual fluid is drawn into long, thin, thread-like trails and deposited on the substrate, forming tailing, stringing, and trailing residue, causing burrs on the outer edge of the single-point profile. If the airflow is simply shut off after the nozzle leaves the effective spray range, the residual fluid at the nozzle will not be collected, and the above problems are difficult to avoid.

[0100] When this mode is selected, the nozzle enters the effective injection zone, and the position zone state transitions to the effective injection zone state. The resulting gas-electric combined execution state is characterized by a preset back pressure in the gas path and a high-pressure pulse output from the high-pressure electric field. The preset back pressure continuously acts on the nozzle fluid cavity, providing a stable positive supply pressure for the fluid. The high-pressure pulse induces the fluid to form micro-scale jets and deposit as liquid droplets within the electric field. The back pressure and high-pressure pulse, as two execution components in the same gas-electric combined execution state, work synergistically to help medium- to high-viscosity fluids obtain sufficient discharge driving force. The preset back pressure value can be pre-set before operation, for example, selected based on the fluid viscosity within the range of 0 to 50 kPa, and remains constant during operation.

[0101] The moment the nozzle crosses the end of the spraying coordinate and exits the effective spraying zone into the non-spraying zone, the position zone state changes from the effective spraying zone state to the non-spraying zone state. The corresponding gas-electric joint execution state then switches from high-pressure pulse + preset back pressure to high-pressure shutdown + preset negative pressure. The gas pressure state changes from being supplied with preset back pressure to being supplied with preset negative pressure, and the high-pressure electric field is shut off.

[0102] In practice, this switching can be manifested as a continuous action of shutting off the back pressure supply and connecting the negative pressure source. The negative pressure source can be generated, for example, by a Venturi negative pressure generator, and the preset negative pressure value can be preset in the range of -30 to -80 kPa.

[0103] In a specific implementation using hardware interval determination, the gas-electric combined execution state transition is triggered by the transition of the position interval state, and the negative pressure effect can be established before the residual fluid in the nozzle is elongated.

[0104] After a preset negative pressure is introduced, the nozzle liquid surface retracts into the nozzle under the suction of the negative pressure. The residual fluid is drawn inward and sheared during the liquid surface retraction process. The nozzle liquid surface changes from the extended state during spraying to the retracted and maintained state. This retracted and maintained state is a specific form of the aforementioned liquid surface state maintenance section in this mode.

[0105] Because the convergence and shearing occur the instant the nozzle exits the effective spray zone, the residual fluid is broken and converged before the nozzle continues to move away. This promptly eliminates the trailing, stringing, and wake residue at the spray tip, improving the integrity of the single-point profile. The waveform representing high pressure conduction and positive pressure within the effective spray zone, and high pressure deflection and negative pressure within the inter-point movement zone, corresponds to the state combination and switching sequence of this mode.

[0106] This mode is one of several gas-electric synergistic timing modes, which can be selected according to fluid viscosity and printing requirements. It is particularly helpful for the array preparation of medium-to-high viscosity slurries that are prone to tailing. Negative pressure retraction, as a specific maintenance method for the liquid surface state maintenance section in the non-jetting zone, differs from other modes in its maintenance method in the non-jetting zone. In practical applications, it can be flexibly selected from various modes according to fluid characteristics and operating conditions.

[0107] Furthermore, in some preferred implementations, the current gas-electric synergy timing mode is a full-process negative pressure anti-drying standby mode; When the nozzle is in the non-jet zone, the air pressure is maintained at the preset standby negative pressure throughout, so that the liquid level in the nozzle remains in a retracted state. When the nozzle enters the effective spraying range, the preset standby negative pressure is turned off and the high-voltage electric field enters the spraying state to complete the spraying; After the nozzle exits the effective spray range, the preset standby negative pressure is restored.

[0108] In the preceding embodiments, negative pressure is mainly applied as a finishing action after the printhead exits the effective spraying zone, used to retract the nozzle liquid surface. However, under conditions of long-term continuous batch printing and intermittent standby, the printhead is in a non-spraying state during the movement between printheads and the standby period between batches. The cumulative duration of these periods often far exceeds the duration of the effective spraying zone itself. If the nozzle liquid surface is not restrained during these periods, the fluid in the fluid chamber will slowly migrate towards the nozzle orifice under the action of surface tension and its own gravity, gradually seeping out and accumulating, and then drying at the nozzle orifice, which may even directly block the nozzle in severe cases.

[0109] This degradation is cumulative. The longer the continuous printing time and the more times the standby is performed, the deeper the bleeding and drying become. This manifests as difficulty in starting the jet, droplet size drift, and a continuous decline in the dot matrix quality of the entire array as the processing time increases.

[0110] To address this, this implementation extends the application of negative pressure from the final action after exiting the spray zone to full-process background protection in the non-jet zone, i.e., using a full-process negative pressure anti-drying standby mode. This mode is also selected from a variety of pre-configured gas-electric synergy timing modes based on the current fluid viscosity and printing requirements. When printing requirements emphasize long-term continuous operation stability, this mode can be selected.

[0111] Specifically, in this mode, the air pressure amplitude is still preset to a fixed threshold before operation and remains constant during operation. The preset standby negative pressure is a value of this preset constant amplitude in this mode. The reason for emphasizing a small amplitude is that the negative pressure amplitude only needs to keep the nozzle liquid surface slightly retracted. If the negative pressure is too large, the fluid will be excessively drawn back, which will affect the re-establishment of the liquid surface during the next injection and prolong the injection recovery time.

[0112] Therefore, the preset standby negative pressure can be selected from a smaller amplitude within the range of -30 kPa to -80 kPa, for example, around -30 kPa. The specific value is determined by testing the fluid viscosity and nozzle diameter. The negative pressure is introduced into the nozzle fluid chamber through the pneumatic actuator. As a specific implementation example, the negative pressure can be generated by a negative pressure valve in conjunction with a Venturi negative pressure generator. The Venturi negative pressure generator utilizes the characteristic that the flow velocity increases and the pressure decreases when compressed air flows through the contraction section to form a stable negative pressure source in the pneumatic path. The negative pressure amplitude remains constant throughout the preset range.

[0113] When the nozzle is in the non-jet zone, whether it is in the inter-point movement section or in an intermittent standby period, the air pressure is maintained at the preset standby negative pressure throughout. Under the continuous constraint of the negative pressure, the liquid surface in the nozzle remains in a retracted state, and the fluid cannot seep out of the nozzle orifice, thus preventing accumulation and drying. In other words, the liquid surface retraction protection is a continuous background state in the non-jet zone, and its coverage range is the entire non-jet zone, not just a segment within it.

[0114] In a specific implementation using hardware position comparison, when the interval determination result indicates that the nozzle has entered the effective spray interval, the position interval state is converted to the effective spray interval state, and the corresponding gas-electric joint execution state is determined accordingly: the gas branch closes the preset standby negative pressure, and the high-pressure branch puts the high-pressure electric field into the spray state. The closure of the negative pressure restores the nozzle liquid surface from the retracted state to the sprayable state, creating liquid surface conditions for the electric field to pull droplets for spraying, and the high-pressure electric field then outputs a high-pressure pulse to complete the spraying. The actual actions of the two branches correspond to the boundary of the entry interval according to the preset timing relationship.

[0115] Optionally, after the preset standby negative pressure is turned off before entering the effective injection zone or when entering the effective injection zone, the gas path can be switched to positive back pressure as needed, so that the back pressure can work with the high-voltage electric field to complete the injection. This approach is an optional refinement of the gas-electric combined execution state corresponding to the effective injection zone, and can be selected according to the fluid characteristics.

[0116] After the nozzle exits the effective spray zone, the position zone state transitions to the non-spray zone state. The corresponding pneumatic-electric combined execution state reverts to high-voltage electric field shutdown and preset standby negative pressure entering the air passage, causing the nozzle liquid level to return to its retracted state. Thus, the continuous maintenance of the non-spray zone, the brief yielding and spraying upon entering the zone, and the recovery after exiting the zone constitute a closed loop that cyclically switches between pneumatic-electric combined execution states according to the position zone state. The continuous maintenance is possible precisely because it relies on recovery after exiting the zone. If the negative pressure does not recover after exiting the zone, the liquid level protection will fail with the arrival of the next non-spray period.

[0117] Through the closed-loop cycle of maintenance, yielding, and recovery described above, the nozzle liquid surface never leaks, accumulates, dries out, or clogs during movement between points and during standby. The spraying capacity is restored each time it enters the effective spraying range by yielding under negative pressure and entering the spraying state under high-voltage electric field.

[0118] Therefore, the equipment can operate continuously for extended periods without material accumulation or beading in the nozzles, and the size of the liquid droplets across the entire array will not deviate significantly with processing time. Compared to the negative pressure retraction finishing method described earlier, this mode extends the application of negative pressure to provide full-process background protection in the non-jetting zone, targeting the independent failure mode of cumulative degradation over time. The finishing method, on the other hand, addresses the trailing problem at the end of a single-point jet. Since their protective objectives and application periods differ, they can be selected separately according to printing requirements.

[0119] This application also proposes a gas-electric coordinated control system for a continuous micro-array of electro-hydraulic currents, used to execute the gas-electric coordinated control method for a continuous micro-array of electro-hydraulic currents in any of the above embodiments. Specifically, the system includes: The location information acquisition module is used to acquire the nozzle position; The spray area storage module is used to store preset spray areas; The interval state determination module is used to determine the position interval state of the nozzle based on the positional relationship between the nozzle position and the preset spray area. The gas-electric coordinated control module is used to determine the corresponding gas-electric joint execution state according to the position interval state. The gas-electric joint execution state is composed of the combination of the high-voltage electric field state and the gas path pressure state, so that the effective injection interval state corresponds to the gas-electric joint execution state that allows injection, and the non-injection interval state corresponds to the gas-electric joint execution state that stops injection and maintains the nozzle liquid level state. The high-voltage actuator is used to execute the high-voltage electric field state in the combined gas-electric execution state. The pneumatic actuator is used to control the pneumatic pressure status in the combined pneumatic and electric operation.

[0120] Through the above system structure, the interval state determination module first converts the continuous position changes of the nozzle into an effective spray interval state or a non-spray interval state. The pneumatic-electric coordinated control module then determines the corresponding pneumatic-electric joint execution state based on the position interval state, and expands the pneumatic-electric joint execution state into two execution components: a high-voltage electric field state and a pneumatic pressure state. In this way, although the high-voltage execution unit and the pneumatic execution unit can use different driving devices, different response compensations, and different signal channels, the target state they execute both originates from the same pneumatic-electric joint execution state, maintaining a continuous correspondence between the nozzle position interval, the position interval state, and the pneumatic-electric joint execution state in the system structure.

[0121] In one specific deployment method, the position information acquisition module can be implemented by a grating encoder that moves synchronously with the multi-axis motion platform. The injection area storage module can store the injection start coordinates and injection end coordinates. The interval state determination module can be implemented by a hardware position comparison circuit. The hardware position comparison circuit compares the real-time nozzle displacement with the injection start coordinates and injection end coordinates and outputs the interval determination result to characterize the position interval state. The pneumatic-electric coordinated control module determines the pneumatic-electric joint execution state based on the position interval state, and then generates two control signals from the pneumatic-electric joint execution state. The two control signals are respectively sent to the high-voltage branch's dedicated level conversion and electrical isolation module and an independent solenoid valve drive isolation circuit.

[0122] In some specific embodiments, the control signal controlling the high-voltage electric field state drives the high-voltage switching circuit after passing through a digital isolator, a shaping and debounce circuit, and a gate driving circuit. The high-voltage switching circuit is connected in series between the high-voltage output terminal of the high-voltage generating unit and the nozzle, and is used to connect or disconnect the path for the high-voltage generating unit to apply high voltage to the nozzle. The control signal controlling the air pressure state drives the air path execution unit through a solenoid valve driving isolation circuit. The back pressure valve, pressure relief valve, and negative pressure valve in the air path execution unit perform corresponding on / off combinations according to the target air path pressure state.

[0123] From the perspective of overall control, when the nozzle is in the effective spraying range, the range state determination module outputs the effective spraying range state. Based on this, the pneumatic-electric coordinated control module determines the permissible pneumatic-electric combined execution state, and the high-pressure execution unit and the pneumatic execution unit execute two state components respectively. When entering the non-spraying range, the pneumatic-electric combined execution state is determined to stop spraying and maintain the nozzle liquid level. In specific implementation, the timing of the control signal output can be adjusted according to the response delay of the two branches.

[0124] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. All modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for gas-electric coordinated control of a continuous micro-array of electrostatics, characterized in that, The position interval state of the nozzle is determined based on the positional relationship between the nozzle position and the preset spray area. The position interval state includes the effective spray interval state and the non-spray interval state. The corresponding gas-electric combined execution state is determined based on the state of the position interval, and the gas-electric combined execution state is composed of a combination of the high-voltage electric field state and the gas path pressure state. According to the gas-electric combined execution state, the high-voltage electric field and the gas pressure acting on the nozzle are controlled respectively, so that the effective injection interval state corresponds to the gas-electric combined execution state that allows injection, and the non-injection interval state corresponds to the gas-electric combined execution state that stops injection and maintains the liquid level state of the nozzle.

2. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 1, characterized in that, The position interval state is obtained by comparing the collected nozzle displacement with the pre-stored spray start coordinates and spray end coordinates through hardware circuitry. Based on the gas-electric combined execution state, control signals are generated to control the high-voltage electric field state and the gas path pressure state, respectively. The two control signals are respectively connected to the execution end through independent channels. The control signal controlling the high-voltage electric field state is connected to the high-voltage switch circuit through the high-voltage branch level conversion and electrical isolation module. The high-voltage switch circuit is used to connect or disconnect the path for the high-voltage generating unit to apply high voltage to the nozzle. The control signal for controlling the pressure state of the gas path is connected to the gas path execution unit via an independent solenoid valve drive isolation circuit.

3. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 2, characterized in that, The level conversion and electrical isolation module includes a digital isolator, a shaping and debounce stage, and a gate driving stage arranged in sequence. The gate driving stage drives the high-voltage switching stage. The high-voltage switching stage is connected in series between the high-voltage output terminal of the high-voltage generating unit and the nozzle. The high-voltage switching stage is equipped with a surge protection stage.

4. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 2, characterized in that, The solenoid valve drive isolation circuit drives the pneumatic actuator unit through optocoupler isolation. The pneumatic actuator unit includes a valve group consisting of a back pressure valve, a pressure relief valve, and a negative pressure valve. Under the action of the control signal, the valve group realizes the switching of four pneumatic pressure states: closing the pneumatic path, introducing a preset back pressure, releasing pressure, and introducing a preset negative pressure.

5. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 4, characterized in that, A first preset viscosity, a second preset viscosity, and a third preset viscosity are preset, wherein the first preset viscosity is less than the second preset viscosity, and the second preset viscosity is less than the third preset viscosity; For fluids with viscosity less than the third preset viscosity, the air pressure state in the gas-electric combined execution state after the nozzle exits the effective spray range is pre-configured according to the fluid viscosity range; When the nozzle exits the effective spraying range to cut off the adhesive, the valve assembly is controlled to execute the corresponding on / off combination according to the viscosity range of the current fluid: When the viscosity is less than the first preset viscosity, the back pressure valve is turned on, the pressure relief valve and the negative pressure valve are turned off, and the gas path maintains the preset back pressure; When the viscosity is greater than or equal to the first preset viscosity and less than the second preset viscosity, the pressure relief valve is turned on, the back pressure valve and the negative pressure valve are turned off, and the gas path is depressurized; When the viscosity is greater than or equal to the second preset viscosity and less than the third preset viscosity, the negative pressure valve is turned on, the back pressure valve and the pressure relief valve are turned off, and the air passage is introduced into the preset negative pressure to draw back the residual fluid in the nozzle.

6. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 1, characterized in that, Multiple gas-electric co-processing timing modes are pre-configured, and the current gas-electric co-processing timing mode is selected from the multiple gas-electric co-processing timing modes according to the fluid viscosity and printing requirements; Each of the gas-electric coordinated timing modes defines the gas-electric joint execution state corresponding to each of the position interval states and the switching order between adjacent gas-electric joint execution states. Based on the current gas-electric coordinated timing mode and the position interval state, the corresponding gas-electric joint execution state is determined, and the high-voltage electric field state and the gas path pressure state in the gas-electric joint execution state are switched according to the switching sequence.

7. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 6, characterized in that, The current gas-electric coordinated timing mode is the gas-electric synchronous start-stop mode. When entering the effective injection zone, the high-voltage electric field state and the gas path pressure state in the corresponding gas-electric joint execution state enter the injection state. When leaving the effective injection zone, the high-voltage electric field state and the gas path pressure state in the corresponding gas-electric joint execution state exit the injection state. The output time of the control signal controlling the high-voltage electric field state and the gas pressure state is preset and compensated according to the mechanical delay of the solenoid valve and the high-voltage response delay, so that the actual transition time of the two states in the gas-electric joint execution state corresponds to the transition boundary of the position interval state.

8. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 6, characterized in that, The current gas-electric coordinated timing mode is a range back pressure injection plus moving range negative pressure retraction mode; When the nozzle is within the effective spray range, the corresponding gas-electric combined execution state is that the high-voltage electric field outputs a high-voltage pulse and the gas path pressure state is that a preset back pressure is introduced. After the nozzle exits the effective spray range, the corresponding gas-electric combined execution state switches to the high-voltage electric field being turned off and the gas pressure state being a preset negative pressure, thus retracting the liquid surface of the nozzle to finish the process.

9. The electro-electric coordinated control method for a continuous micro-array of electro-electric currents according to claim 6, characterized in that, The current gas-electric coordinated timing mode is a full-process negative pressure anti-drying standby mode; When the nozzle is in the non-jet zone, the corresponding gas-electric combined execution state is that the high-voltage electric field is turned off and the gas pressure state is maintained at the preset standby negative pressure, so that the nozzle liquid surface remains in a retracted state. When the nozzle enters the effective spray zone, the corresponding gas-electric combined execution state switches to shutting off the preset standby negative pressure and putting the high-voltage electric field into the spray state; After the nozzle exits the effective spray zone, it resumes the gas-electric combined execution state corresponding to the non-spray zone.

10. A continuous-flow micro-array pneumatic-electric coordinated control system for executing the method according to any one of claims 1 to 9, characterized in that, include: The location information acquisition module is used to acquire the nozzle position; The spray area storage module is used to store preset spray areas; The interval state determination module is used to determine the position interval state of the nozzle based on the positional relationship between the nozzle position and the preset spray area. The gas-electric coordinated control module is used to determine the corresponding gas-electric joint execution state according to the position interval state. The gas-electric joint execution state is composed of a combination of high-voltage electric field state and gas path pressure state, and makes the effective injection interval state correspond to the gas-electric joint execution state that allows injection, and the non-injection interval state correspond to the gas-electric joint execution state that stops injection and maintains the nozzle liquid level state. High-voltage actuator unit, used to execute the high-voltage electric field state in the gas-electric combined execution state; The pneumatic actuator is used to execute the pneumatic pressure state in the pneumatic-electric combined execution state.

Images