Two-fluid air knife type disperse dye digital dyeing equipment and control method

Abstract

The invention provides two-fluid air knife type disperse dye digital dyeing equipment and a control method, and relates to the technical field of textile printing and dyeing. The device comprises a spraying device, a central control unit, a rotary encoder and a fabric operation frame, the spraying device is arranged on the fabric operation frame, the number of the two-fluid nozzles is multiple, all the two-fluid nozzles are transversely arranged, the spraying range of all the two-fluid nozzles can cover the effective width of the fabric, and the spraying range of the two-fluid nozzles can cover the effective width of the fabric. The dye supply system and the high-pressure air source system are both communicated with the two-fluid nozzle; the central control unit comprises an industrial computer and a controller, the industrial computer is used for processing the digital dyeing pattern file and generating a control instruction sequence of each two-fluid nozzle, and the controller is used for sending a fabric movement instruction; the rotary encoder is used for collecting position and speed information of the fabric in real time and can transmit the collected information to the controller, and the controller can transmit the received information to the industrial computer as a synchronous clock.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology, and in particular to a two-fluid air-knife type digital dyeing equipment and control method for disperse dyes. Background Technology

[0002] Traditional polyester fabric dyeing primarily employs immersion dyeing, which suffers from inherent drawbacks such as high water consumption, large chemical usage, generation of high-concentration organic wastewater, high energy consumption, and poor color reproducibility. While digital inkjet printing technology achieves the digitization of patterns, its on-demand dripping technology based on piezoelectric printheads has bottlenecks such as low production efficiency, high ink costs, and limited fabric penetration, making it difficult to meet the demands of large-scale continuous dyeing production. Furthermore, some existing fabric spraying devices often lack intelligent control systems that precisely synchronize with fabric movement, resulting in blurry and discontinuous sprayed patterns, failing to achieve high-precision pattern reproduction.

[0003] Therefore, there is an urgent need in this field for a new dyeing technology and equipment and its core intelligent control method that can deeply integrate digital precision feeding, motion synchronization and closed-loop control of multiple process parameters, and eliminate pollution at the source. Summary of the Invention

[0004] The purpose of this invention is to provide a two-fluid air-knife type digital dyeing device for disperse dyes and a control method therefor. The preferred technical solutions among the various technical solutions provided by this invention and their numerous technical effects are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a two-fluid air-knife type disperse dyeing equipment, including a spraying device, a central control unit, a rotary encoder, and a fabric running frame. The spraying device is mounted on the fabric running frame and includes two-fluid nozzles, a dye supply system, and a high-pressure air source system. There are multiple two-fluid nozzles, all of which are arranged laterally. The spraying range of all two-fluid nozzles can cover the effective width of the fabric. The dye supply system and the high-pressure air source system are both connected to the two-fluid nozzles. The central control unit includes an industrial computer and a controller. The industrial computer is used to process digital dyeing pattern files and generate a sequence of control instructions for each of the two fluid nozzles. The controller is used to issue fabric movement instructions. The rotary encoder is used to collect the position and speed information of the fabric in real time. The controller is communicatively connected to the rotary encoder, and the industrial computer is communicatively connected to the controller. The rotary encoder can transmit the collected information to the controller, and the controller can transmit the received information as a synchronization clock to the industrial computer.

[0006] Optionally, it also includes a fabric feeding and tension control device, which is located behind the fabric inlet of the spraying device and installed at the inlet end of the fabric running frame, and is communicatively connected to the controller.

[0007] Optionally, the fabric feeding and tension control device includes a fabric feeding driver, a fabric feeding roller structure, and a first tension sensor. Undyed fabric is wound on the fabric feeding roller structure, and the fabric feeding roller structure is detachably mounted on the fabric running frame. The fabric feeding driver is mounted on the side end of the fabric running frame, and one end of the fabric feeding roller structure is connected to the output shaft of the fabric feeding driver via a coupling. The first tension sensor is mounted on the fabric running frame and located in front of the fabric feeding roller structure. Both the first tension sensor and the fabric feeding driver are communicatively connected to the controller. The first tension sensor is used to detect tension data information in real time during the fabric feeding process and can transmit the tension data information to the controller. The controller can control the feeding speed of the feeding driver according to the tension data information.

[0008] Optionally, it also includes a pretreatment device, which is mounted on the fabric running frame and located between the fabric feeding and tension control device and the spraying device, and the pretreatment device is communicatively connected to the controller; The pretreatment device is equipped with a cleaning structure and a spraying structure.

[0009] Optionally, it also includes a pre-drying device, a high-temperature baking device, and a cooling and winding device. The pre-drying device, the high-temperature baking device, and the cooling and winding device are arranged sequentially on the fabric running frame along the direction of fabric travel. The pre-drying device is located in front of the fabric outlet of the spraying device. The pre-drying device, the high-temperature baking device, and the cooling and winding device are all communicatively connected to the controller.

[0010] Optionally, the pre-drying device is equipped with a forced circulation heating system; the high-temperature baking device is equipped with a heating plate.

[0011] Optionally, the cooling and winding device includes a cooling structure, a winding driver, a winding roller structure, and a second tension sensor. The winding roller structure is used to wind the dyed fabric and is detachably connected to the fabric running frame. The winding driver is mounted on the side end of the fabric running frame, and the output shaft of the winding driver is connected to the end of the winding roller structure via a coupling. The second tension sensor and the cooling structure are both mounted on the fabric running frame and are located between the winding roller structure and the high-temperature baking device. The cooling structure, the winding driver, and the second tension sensor are all communicatively connected to the controller. The second tension sensor is used to detect tension data during the fabric winding process in real time and can transmit the tension data to the controller. The controller can control the winding speed of the winding driver according to the tension data.

[0012] Optionally, the resolution of the rotary encoder is not less than 1000 pulses / revolution, and the period of the synchronization signal between the controller and the industrial computer is not greater than 10 milliseconds.

[0013] The present invention provides a control method for a two-fluid air-knife type disperse dye digital dyeing device, comprising the following operating steps: Pattern data processing steps: The digital dyeing pattern file is received and processed by an industrial computer to generate a sequence of control instructions corresponding to each two-fluid nozzle; Motion synchronization control steps: The position and speed information of the fabric are collected in real time by a rotary encoder, and the signal is used as a synchronization clock to synchronize the control command sequence with the fabric movement, so as to achieve accurate reproduction of the digital pattern at a predetermined position on the fabric surface. Closed-loop control steps for process parameters: Closed-loop control of at least one of the following parameters, namely, pre-drying temperature, baking temperature, fabric tension, dye supply and airflow supply, is performed by the controller. Production management steps: Dyeing formulas can be called, stored and managed through a human-machine interface, and the equipment operating status and production data can be monitored and recorded in real time.

[0014] Optionally, the pattern data processing steps include: decoding the digital pattern file, managing the color and separating the color plates using RIP software, and generating an instruction sequence to control the opening and closing timing and / or dye flow parameters of each of the two-fluid nozzles; The closed-loop control steps for the process parameters include: dynamically controlling the temperatures of the pre-drying device and the high-temperature baking device using a PID algorithm.

[0015] This invention provides a two-fluid air-knife type digital dyeing device for disperse dyes. Dye supplied by a dye supply system is mixed with compressed air supplied by a high-pressure air source system inside the two-fluid nozzles. The high-speed flow of the compressed air breaks the liquid into extremely fine droplets, forming a uniform mist spray, achieving a highly efficient atomization effect. This increases the dyeing range of the fabric while saving dye. An industrial computer processes the digital dyeing pattern file and generates a control command sequence for each two-fluid nozzle. The controller issues fabric movement commands, and a rotary encoder collects the fabric's position and speed information in real time. The rotary encoder transmits the collected information to the controller, and the controller can transmit the received information as a synchronization clock to the industrial computer, synchronizing the control command sequence with the fabric movement and achieving accurate reproduction of the digital pattern at predetermined positions on the fabric surface.

[0016] The preferred technical solution of the present invention can also produce at least the following technical effects: 1. Intelligent and precise: By deeply integrating RIP data processing, encoder synchronization and closed-loop process control, high-fidelity and high-precision reproduction of color from digital files to the fabric surface is achieved, solving the core technical problems of accurate alignment and uniform color in digital dyeing.

[0017] 2. Revolutionary environmental protection: Based on precision spraying, it achieves near "zero bath ratio" dyeing, reducing wastewater discharge by more than 95% at the source, and eliminating the need for water washing, completely changing the current situation of high water consumption in dyeing.

[0018] 3. High efficiency and energy saving: The single-pass continuous production method significantly shortens the production cycle and eliminates the need to heat large amounts of water, resulting in a significant reduction in energy consumption.

[0019] 4. Excellent flexible production capabilities: Through formula-based management and digital control, it can achieve one-click color changing and rapid switching of complex patterns, perfectly adapting to small-batch and personalized customization needs.

[0020] 5. Overall stability and reliability: Closed-loop control of key process parameters such as tension, temperature, and pressure ensures stable and consistent product quality within and between batches. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a schematic diagram of the structure of a two-fluid air knife type disperse dye digital dyeing device provided in an embodiment of the present invention.

[0023] In the diagram: 1. Spraying device; 2. Fabric running frame; 3. Fabric feeding and tension control device; 4. Pre-treatment device; 5. Pre-drying device; 6. High-temperature baking device; 7. Cooling and winding device. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Example 1 This invention provides a two-fluid air-knife type digital dyeing equipment for disperse dyes, including a spraying device 1, a central control unit, a rotary encoder, and a fabric running frame 2. The spraying device 1 is mounted on the fabric running frame 2 and includes two-fluid nozzles, a dye supply system, and a high-pressure air source system. Multiple two-fluid nozzles are arranged laterally, and their spraying range covers the effective width of the fabric. The dye supply system and the high-pressure air source system are both connected to the two-fluid nozzles, forming a single-pass spraying system. The two-fluid nozzles can be siphon-type or pressure-type designs. The dye supply system continuously and stably supplies disperse dyes that meet the formulation requirements to the two-fluid nozzles, and uses a PLC to monitor and adjust supply parameters (such as pressure and flow rate). The high-pressure air source system provides high-pressure airflow, which mixes with the dye to form an atomization effect, ensuring uniform dye adhesion to the fabric surface. The airflow parameters are adjusted in real time by the PLC.

[0028] The central control unit includes an industrial computer and a controller. The industrial computer processes the digital dyeing pattern file and generates a control command sequence for each two-fluid nozzle. This control command sequence enables the opening and closing timing and flow regulation of the two-fluid nozzles. The controller issues fabric movement commands and can be a PLC. The core function of the controller is as a "logic and process control center," executing the control command sequence issued by the industrial computer and simultaneously achieving multi-parameter closed-loop control. A rotary encoder is mounted on a drive shaft and is used to collect the position and speed information of the fabric in real time. The controller is communicatively connected to the rotary encoder, and the industrial computer is communicatively connected to the controller. The rotary encoder can transmit the collected information to the controller, and the controller can transmit the received information as a synchronization clock to the industrial computer. This invention provides a two-fluid air-knife type disperse dye digital dyeing device. Dye supplied by a dye supply system is mixed with compressed air supplied by a high-pressure air source system inside a two-fluid nozzle. The high-speed flow of the compressed air breaks the liquid into extremely fine droplets, forming a uniform mist spray, achieving a highly efficient atomization effect. This increases the dyeing range of the fabric while saving dye. The industrial computer can process the digital dyeing pattern file and generate a control command sequence for each two-fluid nozzle, while the controller can issue fabric movement commands. The rotary encoder can collect the position and speed information of the fabric in real time and transmit the collected information to the controller. The controller can transmit the received information as a synchronization clock to the industrial computer, synchronizing the control command sequence with the fabric movement and achieving accurate reproduction of the digital pattern at a predetermined position on the fabric surface.

[0029] As an optional implementation, a fabric unwinding and tension control device 3 is also included. The fabric unwinding and tension control device 3 is located behind the fabric inlet of the spraying device 1 and installed at the inlet end of the fabric running frame 2. The fabric unwinding and tension control device 3 is communicatively connected to the controller. The fabric unwinding and tension control device 3 is used to achieve smooth unwinding of the fabric, and works in conjunction with the first tension sensor to adjust the fabric tension, preventing the fabric from stretching, wrinkling, or loosening, thus providing a stable fabric transport foundation for subsequent dyeing processes.

[0030] The fabric feeding and tension control device 3 includes a fabric feeding driver, a fabric feeding roller structure, and a first tension sensor. Undyed fabric is wound on the fabric feeding roller structure, and the fabric feeding roller structure is detachably mounted on the fabric running frame 2. The fabric feeding driver is mounted on the side end of the fabric running frame 2, and one end of the fabric feeding roller structure is connected to the output shaft of the fabric feeding driver through a coupling. The first tension sensor is mounted on the fabric running frame 2 and is located in front of the fabric feeding roller structure. Both the first tension sensor and the fabric feeding driver are communicatively connected to the controller. The first tension sensor is used to detect the tension data during the fabric feeding process in real time and can transmit the tension data to the controller. The controller can control the feeding speed of the feeding driver according to the tension data to avoid dyeing deviation or damage to the fabric due to abnormal tension and maintain the stable operation of the fabric.

[0031] As an optional implementation, a pretreatment device 4 is also included. The pretreatment device 4 is mounted on the fabric running frame 2 and is located between the fabric feeding and tension control device 3 and the spraying device 1. The pretreatment device 4 is communicatively connected to the controller. The pretreatment device 4 is equipped with a cleaning structure and a spraying structure. The pretreatment device 4 performs pretreatment on the fabric before dyeing (such as degreasing, dust removal, and moisture equalization) to improve the fabric's ability to adsorb dye and ensure the uniformity of subsequent dyeing. It is only configured when needed.

[0032] As an optional implementation, the system also includes a pre-drying device 5, a high-temperature baking device 6, and a cooling and winding device 7. These three devices are arranged sequentially on the fabric running frame 2 along the fabric travel direction. The pre-drying device 5 is located in front of the fabric outlet of the spraying device 1. All three devices are communicatively connected to the controller. The pre-drying device 5 performs preliminary drying on the sprayed fabric, removing moisture from the dye and fixing the dye's position on the fabric surface to prevent dye diffusion during subsequent baking, which could lead to blurred patterns. The temperature is controlled by a PLC using a closed-loop PID algorithm to ensure stable process temperature. The high-temperature baking device 6 uses high-temperature treatment to allow dye molecules to penetrate into the fabric fibers, achieving a strong bond between the dye and the fiber and ensuring colorfastness (such as wash resistance and abrasion resistance). The temperature is also controlled by a closed-loop PID algorithm and is a crucial step in dyeing and color fixing. The cooling and winding device 7 cools the baked high-temperature fabric to prevent fabric deformation or secondary dye migration during high-temperature winding. Simultaneously, it neatly winds up the dyed fabric for easy storage or processing.

[0033] As an optional implementation, the pre-drying device 5 is equipped with a forced circulation heating system; the high-temperature baking device 6 is equipped with a heating plate.

[0034] As an optional implementation, the cooling and winding device 7 includes a cooling structure, a winding driver, a winding roller structure, and a second tension sensor. The winding roller structure is used to wind the dyed fabric and is detachably connected to the fabric running frame 2. The winding driver is installed on the side end of the fabric running frame 2, and the output shaft of the winding driver is connected to the end of the winding roller structure via a coupling. The second tension sensor and the cooling structure are both installed on the fabric running frame 2 and are located between the winding roller structure and the high-temperature baking device 6. The cooling structure, the winding driver, and the second tension sensor are all communicatively connected to the controller. The second tension sensor is used to detect tension data during the fabric winding process in real time and transmit the tension data to the controller. The controller can control the winding speed of the winding driver according to the tension data to avoid dyeing deviation or damage to the fabric due to abnormal tension and maintain the stable operation of the fabric.

[0035] As an optional implementation, the rotary encoder has a resolution of no less than 1000 pulses / revolution, and the synchronization signal period between the controller and the industrial computer is no more than 10 milliseconds. The central control unit is the intelligent control core of the equipment, including an industrial computer, a controller, a human-machine interface, and a communication module. The industrial computer integrates RIP software and a color management module, and is responsible for upper-level data processing and instruction generation; the controller is responsible for the logic and process control of the lower-level actuators and exchanges data with the industrial computer in real time.

[0036] Example 2 This invention provides a control method for a two-fluid air-knife type disperse dye digital dyeing device, comprising the following operating steps: Pattern data processing steps: The digital dyeing pattern file is received and processed by an industrial computer to generate a sequence of control instructions corresponding to each two-fluid nozzle; Motion synchronization control steps: The position and velocity information of the fabric are collected in real time by a rotary encoder, and the signal is used as a synchronization clock to synchronize the control command sequence with the fabric movement, so as to achieve accurate reproduction of the digital pattern at a predetermined position on the fabric surface; specifically, the rotary encoder can collect the position and velocity signals of the fabric in real time and feed the signal back to the controller; the controller sends the position signal as a synchronization clock to the industrial computer, so that the RIP software can trigger the corresponding two-fluid nozzle control command according to the real-time position of the fabric, thereby achieving accurate reproduction of the digital pattern at a predetermined position on the fabric surface; Closed-loop control steps for process parameters: The controller performs closed-loop control on at least one of the following parameters: pre-drying temperature, baking temperature, fabric tension, dye supply, and airflow supply; the controller monitors and adjusts the pressure and temperature of the dye supply system and the air pressure and flow rate of the high-pressure air source system in real time to ensure stable atomization effect for spraying control; the controller dynamically controls the temperature of the pre-drying device 5 and the high-temperature baking device 6 according to the preset process formula using a PID algorithm, and ensures that the fabric has sufficient residence time in the high-temperature baking device 6 to complete color fixation for drying and baking control; through tension sensors set at key nodes of the equipment, the controller dynamically adjusts the torque of the unwinding, winding, and drive to maintain constant fabric operating tension for tension control.

[0037] Production management steps: Dyeing formulas are accessed, stored, and managed through a human-machine interface (HMI), and equipment operation status is monitored and production data is recorded in real time. Alarms are issued when abnormalities occur. The core functions of the HMI are: the operational entry point for production management, supporting the access, editing, and storage of dyeing formulas; real-time display of equipment operation status (such as temperature, tension, and nozzle working status); and recording of production data (such as output, process parameters, and equipment malfunctions) for easy traceability and maintenance.

[0038] As an optional implementation, the pattern data processing steps include: decoding the digital pattern file, managing the color and separating the color plates using RIP software, generating an instruction sequence that controls the opening and closing timing of each two-fluid nozzle and / or the dye flow rate parameters, and communicating with the PLC to synchronize the instructions; All devices and components revolve around "digital precision dyeing": industrial computers enable digital pattern processing, PLCs provide closed-loop process control, and rotary encoders ensure synchronized motion. Ultimately, the traditional dyeing processes of reduction cleaning and rinsing are eliminated, balancing dyeing precision, efficiency, and environmental friendliness. This invention completely replaces traditional immersion dyeing with intelligently controlled digital spraying, achieving near-zero wastewater discharge and significantly reducing water and energy consumption. It also boasts outstanding advantages such as high production efficiency, excellent dyeing quality, and adaptability to small-batch customized production, representing a revolutionary breakthrough in polyester fabric dyeing technology.

[0039] Example 3 The fabric unfolds from the fabric feeding and tension control device 3. The first tension sensor on it monitors the tension changes in real time and feeds the signal back to the PLC. The PLC adjusts the torque of each motor to ensure that the tension of the fabric remains constant within the range of 10-30N throughout the process. The specific value can be set through the human-machine interface according to the fabric weight.

[0040] The fabric then enters the spraying unit 1. In this core unit, the RIP software within the industrial computer first reads and parses the digital pattern file (such as CAD or TIFF format), decomposes it into monochrome bitmap data (C, M, Y, K, etc.) corresponding to each two-fluid nozzle through the color management module, and generates a high-frequency sequence of opening and closing commands. Simultaneously, a rotary encoder mounted on the drive shaft continuously monitors the fabric's position and speed. This signal is acquired by the PLC and sent to the industrial computer in real time as a precise synchronization clock. The synchronization signal period between the industrial computer and the PLC is no more than 10 milliseconds, ensuring real-time control. Based on this synchronization signal, the industrial computer sends the control command sequence to the horizontally arranged two-fluid nozzle array at appropriate spatiotemporal coordinates, ensuring that the atomized dye droplets precisely adhere to predetermined positions on the fabric surface, forming the desired pattern. During this process, the PLC also synchronously monitors and adjusts the pressure of the dye supply system (e.g., stabilized at 0.1-0.3 MPa) and the pressure and flow rate of the high-pressure air source system (e.g., stabilized at 0.2-0.5 MPa) to ensure continuous stability of the atomization state.

[0041] The wet fabric, after being sprayed, immediately enters the pre-drying device 5 (such as infrared or hot air drying). The PLC precisely controls the drying temperature at 80-120℃ according to the preset formula to quickly remove moisture / auxiliaries and prevent dye bleeding. Subsequently, the fabric enters the high-temperature baking device 6. The PLC ensures that the fabric is kept at the optimal temperature profile of 190-210℃ for 1-3 minutes through multi-zone temperature control (e.g., three-zone control: 180℃, 190℃, 200℃) and chain speed adjustment to complete the dye sublimation and fixation process.

[0042] Finally, the color-fixed fabric is cooled to below 50°C by a cooling device and then neatly rolled up by the cooling and winding device 7. All process parameters, equipment status, and production data throughout the entire production process are recorded and stored in real time by the central control unit, facilitating quality traceability and analysis.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A two-fluid air-knife type disperse dye digital dyeing apparatus, characterized by, It comprises a spraying device (1), a central control unit, a rotary encoder and a fabric running frame (2), wherein, The spraying device (1) is arranged on the fabric running frame (2), the spraying device (1) comprises a plurality of two-fluid nozzles, a dye supply system and a high-pressure gas source system, all the two-fluid nozzles are arranged transversely, and the spraying range of all the two-fluid nozzles can cover the effective width of the fabric; the dye supply system and the high-pressure gas source system are connected with the two-fluid nozzles; The central control unit comprises an industrial computer and a controller, the industrial computer is used for processing digitalized dyeing pattern files and generating control instruction sequences of each two-fluid nozzle, and the controller is used for issuing fabric movement instructions; The rotary encoder is used for collecting position and speed information of the fabric in real time, the controller is in communication connection with the rotary encoder, the industrial computer is in communication connection with the controller, the rotary encoder can transmit the collected information to the controller, and the controller can transmit the received information to the industrial computer as a synchronous clock.

2. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 1, characterized in that, It also comprises a cloth feeding and tension control device (3), the cloth feeding and tension control device (3) is located behind the fabric inlet of the spraying device (1), and the cloth feeding and tension control device (3) is installed at the inlet end of the fabric running frame (2); the cloth feeding and tension control device (3) is in communication connection with the controller.

3. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 2, characterized in that, The cloth feeding and tension control device (3) comprises a cloth feeding drive, a cloth feeding roller structure and a first tension sensor, the cloth feeding roller structure is wound with undyed fabric, and the cloth feeding roller structure is detachably installed on the fabric running frame (2); the cloth feeding drive is installed at the side end of the fabric running frame (2), one end of the cloth feeding roller structure is connected with the output shaft of the cloth feeding drive through a shaft coupling, and the first tension sensor is installed on the fabric running frame (2) and located in front of the cloth feeding roller structure; the first tension sensor and the cloth feeding drive are in communication connection with the controller; The first tension sensor is used for detecting tension data information in the fabric feeding process in real time and transmitting the tension data information to the controller, and the controller can control the feeding speed of the cloth feeding drive according to the tension data information.

4. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 2, characterized in that, It also comprises a pretreatment device (4), the pretreatment device (4) is installed on the fabric running frame (2), and the pretreatment device (4) is located between the cloth feeding and tension control device (3) and the spraying device (1); the pretreatment device (4) is in communication connection with the controller; The pretreatment device (4) is provided with a cleaning structure and a spraying structure.

5. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 1, characterized in that, It also comprises a pre-drying device (5), a high-temperature baking device (6) and a cooling and winding device (7), which are arranged in sequence on the fabric running frame (2) along the direction of fabric movement, the pre-drying device (5) is located in front of the fabric outlet of the spraying device (1), and the pre-drying device (5), the high-temperature baking device (6) and the cooling and winding device (7) are in communication connection with the controller.

6. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 5, characterized in that, The pre-drying device (5) is provided with a forced circulation heating system; the high-temperature baking device (6) is provided with a heating plate.

7. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 5, characterized in that, The cooling and winding device (7) comprises a cooling structure, a winding driver, a winding roller structure and a second tension sensor, the winding roller structure is used to wind the dyed fabric and is detachably connected to the fabric running frame (2), the winding driver is installed on the side end of the fabric running frame (2), the output shaft of the winding driver is connected to the end of the winding roller structure through a shaft coupling, and the second tension sensor and the cooling structure are both installed on the fabric running frame (2) and located between the winding roller structure and the high-temperature baking device (6), and the cooling structure, the winding driver and the second tension sensor are in communication connection with the controller. The second tension sensor is used to detect the tension data information in real time during the fabric winding process and can transmit the tension data information to the controller, and the controller can control the winding speed of the winding driver according to the tension data information.

8. A two-fluid air-knife type dispersed dye digital dyeing apparatus according to claim 1, characterized in that, The resolution of the rotary encoder is not less than 1000 pulses / revolution, and the synchronization signal period between the controller and the industrial computer is not more than 10 milliseconds.

9. A control method of a two-fluid air-knife type dispersion dye digital dyeing apparatus according to any one of claims 1 to 8, characterized by, The following operation steps are included: Pattern data processing step: receiving and processing digitalized dyeing pattern files through an industrial computer to generate control instruction sequences corresponding to each two-fluid nozzle; Motion synchronization control step: collecting the position and speed information of the fabric in real time through a rotary encoder, and using the signal as a synchronization clock to synchronize the control instruction sequences with the fabric movement, so as to realize accurate reproduction of the digitalized pattern on the predetermined position on the fabric surface; Process parameter closed-loop control step: closed-loop control of at least one parameter of pre-drying temperature, baking temperature, fabric tension, dye supply and air flow supply through a controller; Production management step: calling, storing and managing dyeing formula through a man-machine interaction interface, and monitoring the equipment running state and recording production data in real time.

10. The control method according to claim 9, characterized by The pattern data processing step comprises decoding, color management and color separation of the digitalized pattern file through RIP software to generate instruction sequences for controlling the opening and closing timing and / or dye flow parameters of each two-fluid nozzle; The process parameter closed-loop control step comprises dynamic control of the temperature of the pre-drying device (5) and the high-temperature baking device (6) through a PID algorithm.

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