Self-cleaning flow channel system for preventing indigo dust accumulation of a dial machine cam seat

Abstract

The application provides a self-cleaning flow channel system for preventing indigo dust accumulation of a triangular seat of a circular knitting machine, and the method comprises the following steps: obtaining environmental temperature and humidity parameters and yarn tension fluctuation parameters through a parameter acquisition device; calculating an indigo dust accumulation load index according to the environmental temperature and humidity parameters and the yarn tension fluctuation parameters; obtaining a main shaft rotation signal of the circular knitting machine, and locking a transient avoidance interval in which knitting needles of the circular knitting machine are in a non-looping state based on the main shaft rotation signal; when the indigo dust accumulation load index is greater than a set load critical value, controlling a gas flow generating device to output positive and negative pressure alternating pulse gas flow to the flow channel body in the transient avoidance interval, so as to peel off and discharge the indigo dust in the flow channel body. The application can effectively peel off and discharge the dust in the flow channel, and reduce the interference of the dust removal gas flow on the normal weaving yarn tension.

Description

Technical Field

[0001] This invention relates to the field of textile machinery technology, and in particular to a self-cleaning flow channel system for preventing the accumulation of indigo dust on the triangular seat of a large circular knitting machine. Background Technology

[0002] Currently, when circular knitting machines weave yarns dyed with indigo, the yarn surface experiences high-frequency mechanical friction with the knitting needles and yarn guide components. During this friction, indigo dye particles separate and easily mix with the lubricating oil mist emitted by the machine's operation, forming oily clumps with high adhesive properties. These oily clumps tend to settle and accumulate around the needle guide tracks of the camshaft. The accumulation of oily clumps inside the needle guide tracks increases the sliding resistance of the needles, causing non-linear frictional stagnation in needle movement. This can easily lead to weaving defects such as missed needles and yarn breaks during the knitting process.

[0003] To remove these accumulated dust clumps, the industry typically uses continuous airflow dust removal. While this method can remove some free dust particles, it creates a constant overflow flow field in certain areas of the equipment during operation. Because the yarn is under restricted and taut dynamic stress in certain stages of normal circular knitting machine operation, this constant flow field disturbance interferes with these taut yarns. The lateral blowing of the airflow pressure makes it difficult for the yarn to fall onto the needle hooks according to the predetermined mechanical trajectory, resulting in an imbalance in yarn tension.

[0004] Relying solely on a continuous airflow in one direction to deeply peel away highly adhesive, solidified oily powder clumps has limitations in its physical effectiveness. How to prevent airflow from interfering with yarn tension while cleaning sticky dust is a technical requirement that needs to be considered in the daily production and maintenance of circular knitting machines. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning flow channel system for preventing the accumulation of indigo dust on the triangular seat of a large circular knitting machine, so as to solve the problems pointed out in the background art.

[0006] This invention provides a self-cleaning flow channel system for preventing indigo dust accumulation on a triangular seat of a large circular knitting machine, including a flow channel body, an airflow generating device connected to the flow channel body, and a parameter acquisition device, and also includes an adaptive control device connected to the airflow generating device and the parameter acquisition device. The adaptive control device includes: The physical parameter acquisition module is used to acquire ambient temperature and humidity parameters and yarn tension fluctuation parameters through the parameter acquisition device. The dust accumulation assessment module is used to calculate the indigo dust accumulation load index based on the ambient temperature and humidity parameters and the yarn tension fluctuation parameters. The timing phase locking module is used to acquire the rotation signal of the main spindle of the circular knitting machine and lock the transient avoidance range of the knitting needle of the circular knitting machine in the non-looping state based on the rotation signal of the main spindle of the circular knitting machine. The transient alternating cleaning module is used to control the airflow generator to output positive and negative pressure alternating pulse airflow to the flow channel body within the transient avoidance range when the indigo dust accumulation load index is greater than the set load threshold, so as to strip and discharge the indigo dust in the flow channel body.

[0007] The parameter acquisition device includes a temperature and humidity probe located in the working area of ​​the circular knitting machine and a tension sensor located on the yarn feeding path of the circular knitting machine.

[0008] The flow channel body includes a main dust discharge ring groove arranged around the bottom of the triangular seat and a plurality of dust suction micro-holes connected to the main dust discharge ring groove.

[0009] The airflow generating device includes a high-pressure blowing pump connected to the air inlet of the main dust discharge ring groove and a negative pressure suction pump connected to the air outlet of the main dust discharge ring groove.

[0010] The parameter acquisition device also includes a micro differential pressure sensor probe located inside the main dust discharge ring groove, used to sense pressure drop fluctuation data inside the flow channel body.

[0011] The physical parameter acquisition module obtains the absolute humidity value through the temperature and humidity probe and the tension discrete variance through the tension sensor; The dust accumulation assessment module multiplies and weights the absolute humidity value with the tension discrete variance to generate the indigo dust accumulation load index.

[0012] The timing phase locking module analyzes the rotation signal of the main spindle of the large circular knitting machine, extracts the spindle rotation pulse, compares the spindle rotation pulse with the pre-stored knitting needle kinematic model, identifies the non-interference gap phase in which all knitting needles leave the press point and have not entered the subsequent yarn padding action, and marks the time period between the start clock point and the end clock point of the non-interference gap phase as the transient avoidance interval.

[0013] At the starting clock point, the transient alternating cleaning module controls the high-pressure air pump to output a peak positive pressure airflow, forcing the indigo dust adhering to the inner wall to undergo normal detachment displacement. After the peak positive pressure airflow output ends, the negative pressure suction pump is controlled to increase sharply to the peak negative pressure state, and the indigo dust that has undergone normal shearing displacement is extracted by using fluid shear force.

[0014] The transient alternating cleaning module also calculates the positive pressure residence time based on the duration of the transient avoidance zone; If the duration is shortened, the driving frequency of the high-pressure air pump is increased simultaneously and the positive pressure residence time is shortened, so that the positive and negative pressure switching action is completed before the end clock point.

[0015] The adaptive control device also includes a closed-loop iteration module; After the transient avoidance interval ends, the closed-loop iteration module calls the micro-differential pressure sensor probe to obtain the pressure drop slope of the cleaned flow channel. If it is determined that the pressure drop slope of the cleaned flow channel does not meet the standard, the amplitude parameter of the subsequent peak positive pressure airflow is automatically increased.

[0016] The present invention has achieved the following beneficial effects: The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a circular knitting machine of this invention uses a parameter acquisition device to obtain environmental temperature and humidity parameters and yarn tension fluctuation parameters to calculate the indigo dust accumulation load index, thereby quantitatively assessing the accumulation state of oily dust clumps. The system locks the needles in a transient avoidance zone when they are not in a looping state based on the rotation signal of the circular knitting machine spindle, and only triggers the airflow generator to output alternating positive and negative pressure pulsed airflow within this zone when the dust accumulation load index exceeds a set load threshold. This control mechanism utilizes the alternating physical action of positive pressure expansion and negative pressure suction and shearing to peel off and discharge highly adhesive oily dust clumps around the guide needle track, reducing the mechanical obstruction and needle sliding resistance caused by dust accumulation, and decreasing the occurrence of missed needles and yarn breaks. Meanwhile, the system limits the action time domain of the alternating airflow to a free relaxation window without yarn tension coupling, avoiding the mechanical process of yarn stretching, effectively suppressing the tension imbalance caused by flow field disturbance interfering with the stressed yarn, and improving the stability of the external weaving process while maintaining the smooth flow of the internal dust removal channel.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of the large circular knitting machine in an embodiment of the present invention; Figure 2This is a flowchart of the environmental temperature and humidity parameter processing procedure in an embodiment of the present invention; Figure 3 This is a flowchart of the yarn tension fluctuation parameter extraction and reconstruction process in an embodiment of the present invention; Figure 4 This is a flowchart for calculating the indigo dust accumulation load index in an embodiment of the present invention. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] When a circular knitting machine weaves yarn dyed with indigo, the yarn surface experiences high-frequency mechanical friction with the knitting needles, yarn feeders, and yarn guides. During this friction, indigo dye particles separate and mix with lubricating oil mist emitted from the machine's operation, forming oily powder clumps with high adhesion properties. These oily powder clumps settle and accumulate around the guide needle tracks in the camshaft, increasing needle sliding resistance and inducing weaving defects such as missed needles and yarn breaks. Continuous blowing dust removal generates a constant overflow flow field, which disturbs and interferes with the taut yarn, causing yarn tension imbalance. This embodiment provides a self-cleaning flow channel system for preventing indigo dust accumulation in the camshaft of a circular knitting machine.

[0022] A self-cleaning flow channel system for preventing indigo dust accumulation on a large circular knitting machine's triangular base, such as... Figure 1 As shown, the system includes a flow channel body 100, an airflow generating device 200 connected to the flow channel body 100, and a parameter acquisition device 300. The key feature is that it also includes an adaptive control device 400 connected to the airflow generating device 200 and the parameter acquisition device 300. The adaptive control device 400 is configured to receive the level signal output by the parameter acquisition device 300 and control the electromagnetic drive circuit of the airflow generating device 200 according to a preset logic instruction timing sequence. The adaptive control device 400, as the core central component coordinating data processing and underlying timing distribution, is divided into multiple independent and parallel processing modules based on the data flow sequence and control level. The flow channel body 100 constitutes the physical spatial boundary for dust interception and guided discharge. The airflow generating device 200 acts as a fluid power source driving dust to fall off and be discharged. The parameter acquisition device 300 is responsible for converting environmental, mechanical, and fluid parameters during the operation of the large circular knitting machine into digital baseband signals.

[0023] Progressively, the flow channel body 100 is installed on the base side wall and lower space of the triangular base of the large circular knitting machine. The flow channel body 100 conforms to the arc geometry of the triangular base with a conformal fit design. Specifically, the flow channel body 100 includes a main dust discharge ring groove 110 arranged around the bottom of the triangular base and multiple dust suction micro-holes 120 connecting the main dust discharge ring groove 110. The main dust discharge ring groove 110 adopts an annular closed pipe structure, arranged in multiple segmented loops along the circumference of the large circular knitting machine. The segmented loops are connected by flanges equipped with fluororubber sealing rings to reduce the probability of static pressure leakage from the internal alternating airflow to the outside. The main dust discharge ring groove 110 is extruded from an oil-corrosion-resistant aluminum alloy profile. The aluminum alloy material has the structural rigidity to resist pipe wall vibration caused by transient pulse airflow and also has thermal conductivity. When the compressed air released by the airflow generator 200 expands in volume within the pipe cavity, it absorbs heat. The aluminum alloy pipe wall rapidly exchanges heat with the ambient air of the large circular machine, reducing the risk of low-temperature condensation of lubricating oil mist due to excessively low local temperatures in the flow channel. The bottom cross-section of the inner cavity of the main dust discharge ring groove 110 adopts a streamlined rounded chamfer transition design. The streamlined rounded chamfer transition design reduces the range of the dead zone of the detached vortex generated by the fluid at the right-angle edge, reduces the dynamic pressure loss along the path when the compressed air passes through, and ensures that the airflow containing dust maintains a stable turbulent transport state within the main dust discharge ring groove 110. The teardrop-shaped contour reduces the dead zone of the flow velocity stagnation boundary layer at the bottom corner of the rectangular air duct, forcing the fluid in the mainstream area to pass through at a preset linear velocity, thereby maintaining a fully developed turbulent state with a high Reynolds number inside the pipe. There is radial micro-particle mixing motion inside the airflow in the turbulent state. The micro-particle mixing motion continuously scours the pipe wall, using the kinetic energy of the fluid micro-particle impact to weaken the adsorption van der Waals force between the indigo dust and the anti-stick coating on the inner wall.

[0024] Multiple suction micro-holes 120 penetrate the baffle structure of the triangular base, with the input end facing the dust-generating gap where the knitting needles and the triangular track reciprocate against each other, and the output end connecting to the internal cavity of the main dust discharge annular groove 110. To address the physical problem of end-effector dynamic pressure attenuation caused by long-distance airflow within the main dust discharge annular groove 110, the flow channel adopts a variable cross-section tapering structure. The main dust discharge annular groove 110 has a peak value of the inner diameter flow cross-sectional area in the initial region near the air inlet. Following the geometric path of the pipe extending forward along the circumference of the triangular base, the inner wall of the pipe reduces the cross-sectional diameter using an exponentially converging curve equation. Under the premise of no branch leakage in the pipe network, the reduction in cross-sectional diameter forcibly increases the local true linear velocity of the fluid, thereby redistributing the static pressure potential energy of the fluid into dynamic pressure, compensating for the momentum loss along the path caused by gas escape from the micro-holes. The tapered pipe configuration maintains the airflow outlet velocity at the far end of the flow channel's suction micro-hole 120 above the set airflow shear critical threshold, ensuring a balanced dust removal effect throughout the entire circumference of the triangular base. The multiple suction micro-holes 120 are evenly spaced according to the spatial phase of each circular system of the large circular machine. The spacing between adjacent suction micro-holes 120 exhibits a non-linear decreasing gradient distribution based on the flow channel distance from the suction port of the airflow generator 200. The opening diameter of each suction micro-hole 120 arranged on the wall of the main dust removal ring groove 110 follows the reverse pressure gradient distribution law, implementing an expanded diameter array arrangement. In the high-pressure region near the air inlet where the static pressure inside the flow channel is at its peak, the geometric diameter of the suction micro-hole 120 is processed to the minimum specification size, limiting excessive injection of high-pressure gas in the confined area. Along the longitudinal extension direction of the flow channel, as the static pressure value drops due to friction damping along the pipe, the diameter of the suction micro-hole 120 gradually increases proportionally. The enlarged aperture reduces the local throttling resistance of airflow through the micropores. The higher the density of the suction micropores 120 in areas farther from the suction port, the better. By reducing the pore spacing to compensate for the static pressure attenuation caused by frictional resistance along the pipeline, the difference in negative pressure absorption amplitude at the orifice of all suction micropores 120 is kept within the set allowable range when performing suction.

[0025] The inner cavity of the suction micro-hole 120 is machined with a gradually expanding Venturi flow channel profile. After the external dust-laden airflow is drawn into the inlet of the micro-hole by vacuum suction, it undergoes volume expansion and deceleration / pressure reduction within the gradually expanding section, reducing the physical impact force of dust particles striking the inner wall of the main flow channel and extending the service life of the anti-stick coating inside the flow channel body 100. To overcome the adhesion force of oily dust particles, the inner surfaces of the main dust discharge ring groove 110 and the multiple suction micro-holes 120 are covered with a polytetrafluoroethylene (PTFE) anti-stick coating. The PTFE anti-stick coating reduces the physical surface tension of the metal substrate surface, weakening the intermolecular bonding force between indigo dust and the inner metal surface. The coating process involves multiple steps. The inner wall of the aluminum alloy profile is sandblasted with alumina particles to create a mesh-like surface roughness at the microscopic level. A primer layer rich in epoxy resin is sprayed and cross-linked and cured at a set temperature. After the primer layer has cured, a PTFE suspension is uniformly sprayed. The main dust removal ring trough 110 containing a polytetrafluoroethylene (PTFE) suspension is fed into a high-temperature tunnel furnace for sintering. The high temperature forces the PTFE particles to melt and level, forming a low-porosity hydrophobic and oleophobic surface layer. Under the same physical environment that blocks the penetration of lubricating oil mist into the metal lattice, the hydrophobic and oleophobic surface layer provides a low-friction sliding base surface for the peeling of oily powder particles.

[0026] The airflow generating device 200 is responsible for providing a driving fluid with a pressure gradient to the interior of the flow channel body 100. Specifically, the airflow generating device 200 includes a high-pressure blowing pump 210 connected to the air inlet of the main dust discharge ring groove 110 and a negative pressure suction pump 220 connected to the air outlet of the main dust discharge ring groove 110. The high-pressure blowing pump 210 is an oil-free air compressor equipped with a high-speed electromagnetic proportional valve. Within milliseconds after receiving a trigger level, the high-speed electromagnetic proportional valve injects compressed gas from the high-pressure air tank into the air inlet of the main dust discharge ring groove 110, forming a positive pressure pulse airflow with a wave pattern. The oil-free air compressor reduces the risk of lubricating oil from the air source mixing into the dust discharge flow channel and inhibits secondary agglomeration of external oil and indigo dust. The negative pressure suction pump 220 is a high-speed centrifugal fan, and its suction port is connected to the air outlet of the main dust discharge ring groove 110 by a flange seal. By independently scheduling the start / stop status and valve opening of the high-pressure air pump 210 and the negative-pressure suction pump 220 through underlying logic, a transient flow field environment alternating between positive pressure shock waves and negative pressure swirling flow is constructed within the flow channel body 100. A filter assembly 230 is connected in series between the input pipe and the outlet port of the negative-pressure suction pump 220. The filter assembly 230 is equipped with a two-stage interception filter: the primary filter uses a stainless steel woven mesh to intercept detached sludge clumps; the secondary filter uses glass fiber filter paper to capture micron-sized floating indigo dust particles, blocking most of the dust from entering the impeller chamber of the negative-pressure suction pump 220 to reduce contamination or mechanical wear.

[0027] Parameter acquisition devices 300 are distributed at multiple spatial nodes of the circular knitting machine to acquire physical parameters reflecting the microenvironment and mechanical friction state of the weaving process. Specifically, the parameter acquisition devices 300 include a temperature and humidity probe 310 located in the working area of ​​the circular knitting machine, a tension sensor 320 located on the yarn feeding path of the circular knitting machine, a micro-pressure differential sensor probe 330 located inside the main dust removal ring groove 110, and a photoelectric incremental encoder 340 located on the drive shaft of the circular knitting machine. The temperature and humidity probe 310 is fixed to the leeward area outside the top plate of the circular knitting machine by a bracket. The leeward area avoids the direct blowing range of the kinetic airflow overflowing from the high-pressure air pump 210, ensuring that the acquisition of macroscopic air physical parameters of the workshop is not affected by artificial airflow. The temperature and humidity probe 310 is equipped with a temperature-sensitive resistor and a humidity-sensitive capacitor. The temperature-sensitive resistor senses the thermal kinetic energy of air molecules and converts it into a change in resistance; the humidity-sensitive capacitor absorbs water molecules in the air, changing the dielectric constant and causing a change in capacitance. The analog-to-digital converter integrated circuit inside the temperature and humidity probe 310 continuously outputs digital messages containing ambient temperature values ​​and relative humidity percentages. The tension sensor 320 is a strain gauge tension meter, arranged on a tension control bracket between the yarn feed wheel and the yarn feed nozzle. When the indigo yarn passes through the tension sensor 320, it wraps around the force-measuring guide wheel at a specified wrap angle. The change in the normal tension of the yarn causes geometric deformation of the internal cantilever beam strain gauge. A Wheatstone bridge converts the geometric deformation of the cantilever beam strain gauge into a differential voltage signal. The differential voltage signal is amplified by an instrumentation amplifier and filtered by a resistor-capacitor low-pass filter network to remove electromagnetic crosstalk caused by the start-stop of the workshop's variable frequency motors, outputting a smooth analog voltage baseband signal. Due to the alternating day and night temperature differences in the circular knitting machine workshop, the metal foil strain gauge inside the tension sensor 320 experiences thermally induced zero-point drift error. To correct the reference zero point, the tension sensor 320 incorporates a positive temperature coefficient thermistor and a compensation bridge arm. When the ambient temperature fluctuates, the resistance offset of the thermistor is input to the compensation bridge arm, generating a counteracting voltage of opposite sign at the hardware level. This reduces false strain readings caused by thermal expansion and contraction of the material, and improves the sampling accuracy of the tension sampling sequence.

[0028] The micro-differential pressure sensor probe 330 is configured with a dual-channel pressure-conducting cap structure, with the two caps connected to the static pressure holes on the sidewalls of the main dust discharge annular groove 110 at the inlet and outlet ends, respectively. The piezoresistive silicon-based sensitive core inside the micro-differential pressure sensor probe 330 measures the absolute static pressure difference between the nodes at both ends of the flow channel, converting the static pressure difference into a continuous pressure drop fluctuation analog signal. The amplitude of the pressure drop fluctuation data maps to the degree of shrinkage of the equivalent flow cross-sectional area on the inner wall of the flow channel body 100 due to dust adhesion. When the oily powder particles adhering to the inner wall of the main dust discharge annular groove 110 thicken, the fluid friction coefficient in the flow channel increases, resulting in a larger pressure drop attenuation slope measured by the micro-differential pressure sensor probe 330. To reduce the probability of dust particles in the airflow clogging the static pressure holes on the sidewalls of the flow channel, a porous powder metallurgy breathable cap is nested outside the hole. The porous powder metallurgy breathable cap has a labyrinthine structure in its internal pores, allowing static pressure fluctuations to penetrate the pores and be transmitted to the sensitive core, while the metal skeleton physically intercepts flying indigo powder particles.

[0029] The adaptive control device 400 internally houses a microcontroller unit and a memory chip. The microcontroller unit communicates with the temperature and humidity probe 310, the tension sensor 320, the micro-differential pressure sensor probe 330, and the photoelectric incremental encoder 340 via an industrial fieldbus. To ensure the physical reliability of the control module against electromagnetic interference in the industrial environment, the adaptive control device 400 is equipped with multi-stage hardware filtering and isolation circuits. At the analog signal input port, a passive double-stage low-pass anti-aliasing filter composed of a metal film resistor and a ceramic capacitor is connected in series to filter out high-frequency glitches exceeding the Nyquist sampling frequency. The digital communication interface uses an optocoupler for electrical isolation, blocking common-mode interference current between the ground loops at both ends. The software architecture of the adaptive control device 400 is based on a priority-preemptive real-time scheduling mechanism. Each functional module is encapsulated and decoupled into an independent task execution flow. Tasks of different priorities are time-division multiplexed under the computing power allocation of the microcontroller unit core. External hardware interrupts are assigned high priority to ensure real-time response to underlying pulse edge transitions. The background polling task group performs time-sharing multiplexing execution within kernel idle period segments according to the time-slice round-robin allocation mechanism. The task scheduling architecture avoids the risk of executor start / stop instruction issuance being blocked due to intensive mathematical operations, making alternating airflow control actions more stably effective within the defined transient avoidance interval boundaries.

[0030] The adaptive control device 400 includes a physical parameter acquisition module 410. The physical parameter acquisition module 410 is used to acquire ambient temperature and humidity parameters and yarn tension fluctuation parameters through the parameter acquisition device 300. Specifically, the physical parameter acquisition module 410 acquires the absolute humidity value through the temperature and humidity probe 310 and the tension variance through the tension sensor 320. The physical parameter acquisition module 410 has built-in multi-channel synchronous sampling logic. The processing of ambient temperature and humidity parameters includes... Figure 2As shown, the physical parameter acquisition module 410 executes step S101: It reads the ambient temperature value and relative humidity percentage message sent by the temperature and humidity probe 310 via fieldbus commands, and verifies the cyclic redundancy check code of the message. Step S102: It extracts the Magnus empirical formula coefficients pre-programmed into the microcontroller unit's read-only memory, including the first constant parameter and the temperature compensation ratio coefficient. Step S103: It substitutes the verified ambient temperature value into the exponential function operation unit of the Magnus empirical formula to calculate the current saturated water vapor pressure scalar. Step S104: It sends the saturated water vapor pressure scalar and relative humidity percentage into the hardware multiplier to perform multiplication calculation, obtaining the actual water vapor partial pressure value in the air-gas mixture. Step S105: Combining the general gas constant, it calculates the water vapor mass scalar contained in a unit volume of air through derivation using the ideal gas law, and assigns the calculated mass scalar as the absolute humidity value. Specifically, the specific mathematical model configuration for calculating the absolute humidity value using physical parameters is as follows: Scalar solution of saturated water vapor pressure:

[0031] Actual water vapor partial pressure calculation:

[0032] Absolute humidity value calculation:

[0033] In the formula, Scalar pressure of saturated water vapor (unit: Pa); The first constant parameter is retrieved; and The temperature compensation ratio coefficient is retrieved; The ambient temperature value (unit: °C) that passed the verification. The actual water vapor partial pressure value calculated (unit: Pa); The obtained relative humidity percentage (e.g., 60 when the relative humidity is 60%). The absolute humidity value assigned (unit: g / m³); is the molar mass constant of water vapor (valued at 18.015 g / mol); 273.15 is the universal gas constant (valued at 8.314 J / (mol·K)); 273.15 is the physical conversion constant from Celsius to Kelvin absolute temperature.

[0034] Absolute humidity values ​​are used to determine the spatial free density of water molecules in the air. Increased water molecule density enhances the capillary condensation effect on the surface of indigo dust, leading to an increase in the liquid bridging forces between dust particles and between dust and the inner metal wall, thus increasing the shear adhesion strength of the oily dust particles.

[0035] The data reconstruction and extraction process for yarn tension fluctuation parameters, such as Figure 3 As shown, the physical parameter acquisition module 410 executes step S106: controlling the analog-to-digital conversion channel to perform fixed-frequency discretization sampling of the amplified voltage signal output by the tension sensor 320, forming a tension discrete sampling sequence and storing it in the static random access memory. Execution step S107: At the digital signal processing end, a composite algorithm stack combining median averaging filtering and Kalman state estimation is used for the discretized digital sequence. The median averaging filtering establishes a data sliding window of a set length, sorts the continuous sampled values ​​within the window in descending order, removes extreme value samples at the beginning and end of a set proportion, and calculates the arithmetic mean to smooth the intermittent jump peaks caused by electrostatic discharge. Execution step S108: The data sequence after median smoothing is sent to the Kalman state estimation operator module. The Kalman state estimation operator module uses the posterior state estimation results of the previous measurement period and the system state equation to deduce the prior state prediction matrix for the current measurement period. Execution step S109: Introducing the currently acquired observation variables, the Kalman adaptive gain is calculated by obtaining the measurement residual between the observed value and the predicted value. Kalman adaptive gain is used to weight the residuals, outputting a posterior tension sequence that approximates the physical values. Step S110: A sliding time window of fixed data length is divided in the static random access memory, and the acquired posterior tension sequence is loaded into the sliding time window. Step S111: The activated logic unit performs a summation operation on all discrete tension sampled data within the sliding time window, divides by a fixed data length constant, and outputs the arithmetic mean parameter within the sliding time window. Step S112: The discrete tension sampled data within the sliding time window is read sequentially, and the arithmetic mean parameter is subtracted from each data point to obtain the tension deviation value sequence corresponding to multiple time points. Step S113: The squares of each element in the tension deviation value sequence are multiplied by themselves, and all squares are summed and the average value is calculated to output the discrete variance of the tension. When oily powder clumps accumulate in the cam slide of a circular knitting machine, the needle movement exhibits non-linear frictional resistance. This resistance force is transmitted in the reverse direction along the needle hook to the fed yarn, causing random high-frequency oscillations in the yarn tension. These oscillations lead to an increase in the calculated value of the tension variance. This increase in the tension variance confirms that the indigo powder clumps within the yarn feed channel are peeling off and forming mechanical friction interference.

[0036] The adaptive control device 400 also includes a dust accumulation assessment module 420. The dust accumulation assessment module 420 is used to calculate the indigo dust accumulation load index based on ambient temperature and humidity parameters and yarn tension fluctuation parameters. Specifically, the dust accumulation assessment module 420 multiplies and weights the absolute humidity value with the tension variance to generate the indigo dust accumulation load index. At the algorithm execution level, such as... Figure 4 As shown, in step S201, the dust accumulation assessment module 420 performs linear normalization calculations on the absolute humidity value and the tension discrete variance. Taking the normalization of the tension discrete variance as an example, the dust accumulation assessment module 420 obtains the current operating speed parameter of the large circular kiln, and searches for the corresponding nominal upper limit and nominal lower limit of the tension variance in the database based on the operating speed parameter. The nominal lower limit of the tension variance is subtracted from the currently calculated tension discrete variance, and then divided by the difference between the nominal upper and lower limits of the tension variance to obtain the dimensionless normalized tension fluctuation scalar. Similarly, the dimensionless normalized humidity scalar is obtained. In step S202, the dust accumulation assessment module 420 retrieves the preset humidity-sensitive weighting constant and tension-sensitive weighting constant. The humidity-sensitive weighting constant is used to perform a multiplication mapping on the normalized humidity scalar, and the tension-sensitive weighting constant is used to perform a multiplication mapping on the normalized tension fluctuation scalar. Step S203: Input the two mapped sets of variables into the logic multiplier of the microcontroller unit and perform digital cross-multiplication. Step S204: After adding a noise floor compensation constant to the product result, the output is the indigo dust accumulation load index. Specifically, the nonlinear cross-multiplication weighted mathematical model of the indigo dust accumulation load index is expressed as: In the formula, The output is the indigo dust accumulation load index (a dimensionless parameter). The absolute humidity value is currently calculated; and These are the nominal lower and upper limits of absolute humidity set by the system, respectively. This is the currently calculated discrete variance of the tension; and These are the lower and upper limits of the nominal tension variance found, respectively. The humidity-sensitive weighting constant is retrieved; The tension-sensitive weighting constant is retrieved; This is the additional noise floor compensation constant.

[0037] The theoretical basis for setting the multiplicative weighted topology lies in the fact that dust clogging exhibits multivariate nonlinear coupling characteristics. In a high-humidity environment without tension fluctuations, the dust clumps are in a stable adhesion stage; under conditions of tension fluctuations but a dry environment, the dust clumps are loose and dry. When the absolute humidity increases, leading to high viscosity in the dust clumps, and the increased variance in tension dispersion proves that the dust clumps are blocking the mechanical channels, the physical state of dust adhesion exhibits nonlinear accumulation. The multiplication operation reflects the calculation results under the simultaneous occurrence of these dual influencing conditions. Step S205: The dust accumulation assessment module 420 continuously compares the indigo dust accumulation load index with the set load threshold. If the comparison instruction returns a logical truth value, the dust accumulation assessment module 420 writes a valid airflow action permission flag to the background state machine memory.

[0038] The circular knitting machine's loop-forming system includes processes such as yarn padding, loop closing, loop forming, loop removal, and yarn bending. During the yarn padding to bending stage, the yarn is pulled and bent by the knitting needles, placing it in a restricted and taut dynamic stress phase. If the airflow generator 200 is activated during this stress phase, high-pressure fluid is ejected from the dust-collecting micro-holes 120, and the fluid's dynamic pressure laterally impacts the taut yarn segment. The yarn, deflected by the airflow pressure, cannot fall onto the needle hook along the predetermined mechanical trajectory, causing knitting defects such as fabric tears. The adaptive control device 400 is equipped with a timing phase locking module 430. The timing phase locking module 430 is used to acquire the rotation signal of the circular knitting machine's main shaft and, based on this signal, locks the knitting needles in a transient avoidance range when they are not in a loop-forming state. A photoelectric incremental encoder 340 is coaxially mounted on the journal of the circular knitting machine's drive shaft. The internal engraving disk of the photoelectric incremental encoder 340 cuts the light beam generated by the light-emitting diode, and the photoelectric receiving array converts the mechanical rotation into alternating high and low level pulse signals. The photoelectric incremental encoder 340 rotates synchronously with the spindle and outputs a quadrature pulse train containing spindle angular displacement information. The input port of the timing phase locking module 430 is connected to the photoelectric incremental encoder 340 to receive the quadrature pulse train.

[0039] Specifically, the timing phase locking module 430 analyzes the spindle rotation signal of the circular knitting machine, extracts the spindle angle pulse, compares the spindle angle pulse with the pre-stored needle kinematic model, identifies the non-interference gap phase where all needles have left the presser point and have not entered the subsequent yarn padding action, and marks the time period between the start clock point and the end clock point of the non-interference gap phase as the transient avoidance interval. Step S301: The timing phase locking module 430 configures a bidirectional interrupt service subroutine triggered by rising and falling edges. When the A-phase quadrature signal of the photoelectric incremental encoder 340 reverses its level, the microcontroller unit pauses its regular tasks and jumps to the interrupt service subroutine. Step S302: The interrupt service subroutine reads the B-phase quadrature signal level status of the photoelectric incremental encoder 340. Based on the level combination rule of A-phase and B-phase, it determines whether the spindle is rotating in the forward or reverse direction and executes the increment or decrement operation of the internal angle accumulator accordingly. Step S303: The timing phase locking module 430 uses its internal hardware decoding circuit to capture the zero-position reference level signal output by the photoelectric incremental encoder 340. Upon receiving the zero-position reference level, it clears the internal angle accumulator to zero, compensating for the slip error of the mechanical transmission cycle. Step S304: The real-time stored value of the internal angle accumulator is multiplied by the angular resolution constant of the photoelectric incremental encoder 340, outputting a real-time angle scalar representing the current global mechanical angle of the spindle, and the spindle angle pulse is extracted. The timing phase locking module 430 has a kinematic model of the knitting needle embedded in its memory. The knitting needle kinematic model is constructed as a high-dimensional two-dimensional lookup table. The row address of the table maps to a discrete mechanical angle of 360 degrees, and the column address maps to the number of each looping system of the circular knitting machine. The data stored inside the table is the vertical lifting height coordinate of the knitting needle under the corresponding angle and looping system, as well as the current state attribute code of the knitting needle. Execution step S305: The timing phase locking module 430 executes a high-frequency polling query instruction, substituting the currently extracted spindle angle pulse as the row address into the knitting needle kinematic model. The logic processing unit traverses the state attribute codes of all looping systems under the current row address. Execution step S306: When the traversal result confirms that, under the current global mechanical angle, the old loop from the previous looping cycle has disengaged from the needle bar and crossed the lowest pressure point, and the subsequent starting triangle has not yet lifted the knitting needle to contact the newly fed yarn, the system determines that the circular knitting machine has entered a free relaxation window of low yarn tension coupling. The corresponding mechanical angle interval is defined as the non-interference gap phase. Execution step S307: The timing phase locking module 430 captures the count value of the microprocessor's internal system clock at the instant it enters the non-interference gap phase as the starting clock point. By calculating the current spindle angular velocity and combining it with the endpoint angle threshold of the non-interference gap phase, the feedforward prediction obtains the count value at the instant it leaves the non-interference phase as the ending clock point. The specific feedforward prediction cross-domain calculation mathematical formula is configured as follows: In the formula, The microprocessor internal count value corresponding to the end clock point obtained from feedforward prediction; The count value of the starting clock point at the instant of entering the non-interference gap phase; The current real-time rotation angle of the large circular machine spindle at the instant it enters the non-interference gap phase (unit: rad); The set threshold angle for the endpoint of the non-interference gap phase (unit: rad). The calculated current angular velocity of the main shaft (unit: rad / s); This is the constant frequency of the main oscillation of the microprocessor's internal system clock (unit: Hz). The timing phase-locking module 430 marks the time axis span between the start clock point and the end clock point as the transient avoidance interval. Within the time domain of the transient avoidance interval, the artificial airflow ejected from the flow channel does not constitute physical interference at the tension level with the yarn's motion trajectory.

[0040] The adaptive control device 400 includes a transient alternating cleaning module 440. The transient alternating cleaning module 440 is used to control the airflow generator 200 to output alternating positive and negative pressure pulsed airflow to the flow channel body 100 within a transient avoidance zone when the indigo dust accumulation load index exceeds a set load threshold, in order to peel off and discharge the indigo dust within the flow channel body 100. Specifically, at the initial clock point, the transient alternating cleaning module 440 controls the high-pressure blowing pump 210 to output a peak positive pressure airflow, forcing the indigo dust adhering to the inner wall to undergo normal detachment displacement; after the peak positive pressure airflow output ends, it controls the negative pressure suction pump 220 to surge to a peak negative pressure state, using fluid shear force to extract the indigo dust that has undergone normal detachment displacement. In the control execution sequence, step S401 is executed: when the transient alternating cleaning module 440 detects the airflow action permission flag in the state machine storage area, it enters a high-speed comparison monitoring state of the system clock. When the internal global clock count equals the starting clock, the transient alternating cleaning module 440 outputs a high-level enable signal to the electromagnetic proportional valve control terminal of the high-pressure air pump 210. Execution step S402: The proportional electromagnet of the electromagnetic proportional valve establishes an electromagnetic field, driving the valve core to overcome the resistance of the reset spring and perform a full-degree opening displacement. Compressed air stored in the air tank is discharged into the inner cavity of the flow channel body 100 through the air inlet of the main dust discharge ring groove 110 and sprayed outward from multiple dust suction micro-holes 120. Execution step S403: The airflow wavefront invades the micro-gap interface between the edge of the oily powder clump and the metal pipe wall of the flow channel. Gas molecules are rapidly pressurized by spatial compression within the gap interface, generating a pushing expansion stress perpendicular to the metal pipe wall. The value of the pushing expansion stress overcomes the physical adhesion of the bottom of the oily powder clump and the surface tension limit of the lubricating oil film, forcing the indigo dust and oil stains adhering to the inner wall to detach from their original bonded state and displace normally towards the geometric center of the cavity. Step S404: After the set pulse duration is reached, the transient alternating cleaning module 440 cuts off the enable control level of the electromagnetic proportional valve, terminating the output of the peak positive pressure airflow. Step S405: After experiencing the set pneumatic safety dead zone delay, the transient alternating cleaning module 440 sends a control word command to the speed regulator of the negative pressure suction pump 220 to increase the speed sharply. The pneumatic safety dead zone delay is configured to wait for the residual positive pressure energy in the pipeline to dissipate naturally. Step S406: The spindle motor of the negative pressure suction pump 220 increases its speed under the drive of the starting current. The absolute pressure inside the main dust discharge ring groove 110 drops from the positive extreme value to the peak negative pressure state within a millisecond period. The pressure difference reversal phenomenon induces fluid shear turbulence within the flow channel body 100. The fluid shear turbulence engulfs the loosely structured indigo dust that has undergone normal detachment displacement, and uses the viscous shear force of the high-speed airflow to separate the dust clumps. Dispersed small dust particles are drawn out by the airflow in the outlet duct and into the filter assembly 230 outside the system.

[0041] When a circular knitting machine weaves fabrics with different weight parameters and pattern structures, the rotational angular velocity of the machine's spindle exhibits dynamic alternating changes. The increase in the spindle's rotational angular velocity leads to compression of the knitting cycle in the physical time domain, causing a synchronous reduction in the time axis span corresponding to the non-interference gap phase. If a fixed purging sequence is executed, the jetting action of the positive pressure pulse airflow and the suction action of the negative pressure airflow will overflow sequentially. This sequential overflow indicates that the airflow turbulence inside the flow channel body 100 continues until the knitting needles re-hook the inserted yarn under stress. The residual jet pressure overflowing from the flow channel opening laterally blows against the taut indigo yarn, causing the yarn tension to exhibit nonlinear fluctuations. Based on the mechanical and fluid coupling constraint boundary, the transient alternating cleaning module 440 also calculates the positive pressure residence time based on the duration of the transient avoidance interval. The positive pressure residence time is defined as the physical duration during which the high-pressure air pump 210 maintains peak positive pressure airflow output while the high-speed electromagnetic proportional valve is in the open state. For the calculation and dynamic adjustment of the positive pressure residence time, step S501 is executed: The transient alternating cleaning module 440 internally calls the timing module to perform system clock tick capture calculation. After receiving the internal trigger signals corresponding to the start and end clock points sent by the timing phase locking module 430, the timing module latches the current global clock tick count value respectively. Step S502 is executed: The arithmetic logic unit inside the transient alternating cleaning module 440 reads the two latched global clock tick count values, performs a numerical subtraction operation, and obtains the relative pulse number difference characterizing the time span. The relative pulse number difference is multiplied by the physical clock period scalar of the main oscillator to obtain the true duration of the transient avoidance interval. Step S503 is executed: The storage medium of the transient alternating cleaning module 440 is pre-divided into a time allocation coefficient storage area. The time allocation coefficient storage area contains the set positive pressure allocation ratio constant, pneumatic pipeline pressure build-up delay constant, and negative pressure allocation ratio constant. The pneumatic pipeline pressure build-up delay constant characterizes the physical pressure build-up lag time between the control level being issued and the internal fluid pressure rising to a predetermined peak. Step S504: The transient alternating cleaning module 440 subtracts the fixed pneumatic pipeline pressure build-up delay constant from the actual duration to obtain the available action width scalar. Multiplying the available action width scalar by the positive pressure distribution ratio constant, the applicable positive pressure residence time under the current dynamic cycle is calculated. Specifically, the algebraic calculation formula for the positive pressure residence time is configured as follows: In the formula, The calculated positive pressure residence time applicable under the current dynamic cycle; The actual duration of the transient avoidance interval derived from the conversion; The term is the set pressure build-up delay constant of the pneumatic pipeline. That is, the width scalar representing the available action obtained; The positive pressure distribution ratio constant is set.

[0042] If the calculated duration is shortened, to avoid timing overflow at the end of the alternating pulse airflow execution, the transient alternating cleaning module 440 simultaneously shortens the positive pressure residence time. In terms of fluid dynamics, shortening the positive pressure residence time reduces the total expansion work range of the peak positive pressure airflow on the oily powder particles adhering to the pipe wall. The decrease in the total expansion work range leads to a decline in the physical shear stripping efficiency against the solidified indigo dust. To compensate for the mechanical work drop caused by time axis compression, if the duration is shortened, the transient alternating cleaning module 440 simultaneously increases the drive frequency of the high-pressure blowing pump 210 and shortens the positive pressure residence time, ensuring that the positive / negative pressure switching action is completed before the end clock point. In the underlying control link, step S511 is executed: the transient alternating cleaning module 440 reads the frequency compensation mapping matrix in the storage area. The frequency compensation mapping matrix uses the shortened actual duration as an independent input variable and outputs the calculated target operating drive frequency scalar. Specifically, the equivalent work compensation nonlinear calculation formula at the bottom layer of the frequency compensation mapping matrix is ​​constructed as follows: In the formula, The calculated target operating drive frequency scalar (unit: Hz); The reference operating drive frequency (unit: Hz) set for the large circular kiln at its nominal operating angular velocity; The duration of the reference transient avoidance zone corresponding to the nominal working angular velocity of the large circular kiln; The shortened actual duration is the one currently calculated. The work compensation index constant (preferably ranging from 1.0 to 2.0) is set based on the cumulative effect of hydrodynamic excitation energy. Step S512: The transient alternating cleaning module 440 sends a frequency boosting control message to the brushless DC motor power inverter configured with the high-pressure air pump 210, increasing the pulse width modulation carrier frequency of the inverter drive module to a matching value. The power inverter uses a magnetic field-oriented control space vector pulse width modulation algorithm. The motor stator current is measured, and spatial coordinate transformation logic is executed to separate the current in the stationary coordinate system into quadrature-axis current and direct-axis current that rotate with the rotor. The set value of the quadrature-axis current is adjusted to manipulate the electromagnetic torque of the motor, achieving closed-loop control of the drive frequency. After the drive frequency is increased, the rotor inside the high-pressure air pump 210 accelerates under the traction of the stator magnetic field, enabling the compression mechanism to complete a dense intake and exhaust work cycle within a short time interval. The exhaust power cycle increases the gas density compression slope at the air inlet of the main dust removal ring groove 110, causing the compressed airflow injected into the flow channel body 100 to have a shock wave front with an expanded pressure rise derivative. During the compressed positive pressure residence time, the shock wave front continuously impacts the surface of the indigo powder particles in an adhered state in the form of a high-frequency fluid shock wave. The kinetic energy accumulation effect of the fluid shock wave fills the gap in the action time width, forcing the oily powder particles on the surface of the flow channel metal substrate to produce normal shedding displacement. By shortening the positive pressure residence time and increasing the driving frequency in a synchronized operation, the transient alternating cleaning module 440 ensures that the alternating fluid motion constraints are completed before the end clock point. When the mechanical angular displacement of the main shaft of the circular knitting machine exceeds the end clock point and the knitting needles synchronously enter the yarn hooking stroke, the turbulent flow field inside the flow channel body 100 decays and returns to a steady-state resting equilibrium state, weakening the path of physical interference of fluid dynamic pressure on the outer yarn.

[0043] In the climatic environment of a textile production workshop, the indigo dust deposited on the inner wall of the flow channel body 100 undergoes a physicochemical transformation due to the alternating relative humidity and the combined effects of the atomization concentration of the lubrication system. Dust particles cross-link with mineral oil molecules through condensation, evolving into solidified dirt with high shear yield strength. The peak positive pressure airflow with static amplitude is insufficient to remove the highly adherent solidified dirt. To achieve fluid dust removal regulation, the adaptive control device 400 also includes a closed-loop iteration module 450. After the transient avoidance interval ends, the closed-loop iteration module 450 calls the micro-differential pressure sensor 330 to obtain the pressure drop slope of the cleaned flow channel. If the pressure drop slope of the cleaned flow channel is determined to be insufficient, the amplitude parameter of the subsequent peak positive pressure airflow is automatically increased. The timing constraint execution step S601 for obtaining the pressure drop slope of the cleaned flow channel is as follows: After the system clock passes the end clock point and the fluid pipeline turbulence dissipation delay period, the closed-loop iteration module 450 sends a continuous conversion start command to the analog-to-digital converter responsible for differential pressure acquisition. The sensitive bridge inside the micro-differential pressure sensor probe 330 measures the differential static pressure scalar between the air inlet and outlet of the main dust exhaust ring trough 110, and outputs the differential static pressure scalar as an analog differential voltage signal. Step S602: The analog-to-digital converter quantizes and samples the analog differential voltage signal, forming a differential static pressure discrete sampling sequence stored in a buffer register. Considering the aerodynamic harmonic ripple caused by the impeller rotation of the negative pressure suction pump 220 inside the flow channel body 100, the closed-loop iteration module 450 directs the differential static pressure discrete sampling sequence to a software-level finite impulse response (FIR) low-pass filter network. The FIR low-pass filter network performs discrete convolution calculations on the sequence using a coefficient sliding window, suppressing and filtering out the high-frequency energy components of the aerodynamic harmonic ripple, and outputting a smoothed static pressure difference sequence to the main operation buffer.

[0044] Execution step S603: The closed-loop iteration module 450 calls the multinomial linear regression calculation subroutine. The subroutine uses the sampled time labels in the smoothed static pressure difference sequence as the independent variable series parameter and the corresponding pressure values ​​as the dependent variable series parameter to construct a mathematical model of pressure drop evolution about the time axis. Execution step S604: The closed-loop iteration module 450 performs arithmetic summation on all time label values, divides the summation result by the total number of time points, and calculates the average time label value. It also performs arithmetic summation on all pressure values, divides the summation result by the total number of data points, and calculates the average pressure drop value. Execution step S605: It iteratively extracts each time label value, subtracts the average time label value from each time label value to obtain the time label deviation value. It also iteratively extracts each pressure value, subtracts the average pressure drop value from each pressure value, and obtains the pressure drop deviation value. Execution step S606: It multiplies the time label deviation value of the corresponding data point with the pressure drop deviation value to obtain the data point deviation product value. The product values ​​of the deviations of all data points are arithmetically summed to obtain the sum of the deviation covariance values. Step S607: Multiply the time label deviation value of the corresponding data point by itself to obtain the squared time label deviation value. The squared time label deviation values ​​are arithmetically summed to obtain the sum of the time deviation variance values. Step S608: The closed-loop iteration module 450 divides the sum of the deviation covariance values ​​by the sum of the time deviation variance values ​​to obtain the principal slope constant of the mathematical model. The principal slope constant is assigned the pressure drop slope of the cleaned flow channel. The pressure drop slope of the cleaned flow channel maps to the actual physical value of the friction damping coefficient along the pipeline network at the fluid dynamics level. When the deposits on the inner wall of the pipeline network are cleaned and the metal surface is restored to its smoothness, the equivalent hydraulic diameter of the pipeline network reaches the factory specifications, and the potential energy loss of the fluid friction along the flow channel drops to a set low level. The calculated pressure drop slope of the cleaned flow channel exhibits a low-angle, gentle fluctuation trend. If, after being flushed by a preceding pulsed airflow, the inner wall retains solidified oily powder particles, these residues constitute a local physical narrowing boundary. As the fluid flows through this narrowing boundary region, it experiences throttling expansion resistance and eddy current losses. This additional loss of kinetic energy leads to a decrease in the total fluid head and a widening of the static pressure difference. The calculated pressure drop slope of the cleaned flow channel appears as a positive, upward-sloping curve.

[0045] Step S701: The closed-loop iteration module 450 reads the pre-written upper limit threshold of the reference pressure drop slope from the storage area. The closed-loop iteration module 450 performs an arithmetic comparison between the calculated cleaned channel pressure drop slope and the upper limit threshold of the reference pressure drop slope. If the calculated cleaned channel pressure drop slope is greater than the upper limit threshold of the reference pressure drop slope, the system determines that the cleaned channel pressure drop slope does not meet the standard. The determination result confirms at the algorithm level that the alternating pulse airflow energy output in the current cycle has not overcome the physical adhesion network of indigo dust. If the cleaned channel pressure drop slope is determined to be unsatisfactory, the closed-loop iteration module 450 automatically increases the amplitude parameter of the subsequent peak positive pressure airflow. Step S702: The closed-loop iteration module 450 reads the airflow energy duty cycle control word of the current cycle. Step S703: The closed-loop iteration module 450 subtracts the calculated cleaned channel pressure drop slope from the set target pressure drop slope parameter to obtain the slope deviation value of the current cycle. Step S704: The closed-loop iteration module 450 multiplies the slope deviation value of the current cycle by a set proportional amplification factor to obtain the proportional compensation component. Step S705: The slope deviation value of the current cycle is arithmetically added to the historical cumulative deviation value to obtain the integral deviation value. The integral deviation value is multiplied by a set integral amplification factor to obtain the integral compensation component. Step S706: The proportional compensation component and the integral compensation component are arithmetically added to obtain the total control compensation amount. Step S707: The gas kinetic energy duty cycle control word of the previous cycle is added to the total control compensation amount to generate the updated gas kinetic energy duty cycle control word. Specifically, the closed-loop adaptive iterative update of the discrete difference equation for this gas kinetic energy duty cycle control word is as follows:

[0046]

[0047]

[0048] In the formula, This is the control cycle sequence number for the closed-loop adaptive adjustment of the large circular locomotive. For the current number The slope deviation value for each cycle; The target pressure drop slope parameter is set; For the current number The pressure drop slope of the cleaned flow channel obtained from each cycle; The summation of the control compensation increment is calculated for the current period; The set scaling factor; The integral amplification factor is set. The slope deviation value of the preceding period; The updated current cycle airflow kinetic energy duty cycle control word; The duty cycle control word for the gas kinetic energy of the preceding cycle.

[0049] Within the new transient avoidance zone triggered by the rotation of the main shaft of the large circular kiln during the next cycle, the transient alternating cleaning module 440 reads the updated airflow kinetic energy duty cycle control word and drives the control channel to output a widened analog voltage envelope, thereby increasing the holding excitation current of the proportional electromagnet of the electromagnetic proportional valve. This increased excitation current causes the valve core to compress the return spring, resulting in a wider physical opening. This allows the main dust discharge ring groove 110 inlet to receive a compressed air jet with increased cross-sectional area and mass flow rate, automatically increasing the amplitude parameter of the subsequent peak positive pressure airflow. When the compressed gas with increased flow penetrates the gaps at the bottom of the oily powder agglomerates, it generates increased normal expansion and tearing stress, using the increasing fluid kinetic energy to sever the cross-linking bonds of stubborn indigo dust. Through the accumulation of closed-loop parameters—sampled, fitted, compared, and adjusted during the large circular kiln's operating cycle—the system achieves adaptive adjustment of the driving energy until the pressure drop slope of the cleaning channel falls back to within the upper limit threshold of the reference pressure drop slope.

[0050] When the closed-loop iteration module 450 executes the amplitude parameter increase instruction, a safety constraint interception network is built into the underlying architecture. The aluminum alloy pipe wall material of the flow channel body 100 and the sealing flange at the interface have pressure resistance parameter limitations. Execution step S801: The constant storage area of ​​the closed-loop iteration module 450 contains a safety pressure upper limit control word. After each execution of the gas kinetic energy duty cycle control word, the closed-loop iteration module 450 performs an arithmetic comparison between the accumulated result and the safety pressure upper limit control word. Execution step S802: If the accumulated result does not exceed the safety pressure upper limit control word, the amplitude parameter update routine is allowed to execute. Execution step S803: If the accumulated result reaches the safety pressure upper limit control word, the closed-loop iteration module 450 triggers the limit-over-limit exception logic, intercepts the amplitude increase operation, and clamps the gas kinetic energy duty cycle control word to the limit value corresponding to the safety pressure upper limit control word. Execution step S804: The closed-loop iteration module 450 sends a flow channel blockage alarm message to the main control panel of the large circular knitting machine workshop via the industrial communication bus, prompting manual intervention for physical unblocking and maintenance. The constraint logic, while adjusting the system's cleaning kinetic energy, limits the safe operating limits of physical mechanical equipment to prevent the risk of mechanical damage to the pipeline network caused by increased high-pressure airflow. To reduce the risk of underlying flash memory sector breakdown due to frequent control word updates, a wear-leveling erase / write algorithm is executed in the storage area. The updated control word uses a circular queue pointer addressing mode, distributing the writing to flash memory blocks at different physical addresses to balance the number of physical erase / write operations per storage unit.

[0051] To ensure the continuity of industrial operation, the underlying controller of the adaptive control device 400 integrates a communication bus module based on a controller area network. The communication bus module is equipped with a differential signal transceiver for transmitting operating parameters and status codes between the large circular knitting machine's central control platform and the adaptive control device 400. Step S901: The analog-to-digital conversion channel of the micro-differential pressure sensor probe 330 returns a long-term static zero value or full-scale limit value. Step S902: The internal status self-check routine of the adaptive control device 400 determines that the sensor has a disconnection or short-circuit fault. Step S903: The closed-loop iteration module 450 suspends the calculation task of adjusting the amplitude parameters based on the pressure drop slope. The adaptive control device 400 switches to degraded operation mode. Step S904: In degraded operation mode, the transient alternating cleaning module 440 extracts the fixed safety pneumatic kinetic energy parameters stored in the read-only memory and maintains the set cleaning cycle within the locked transient avoidance range according to a fixed peak positive pressure level. The communication bus module packages the sensor failure status code into a data frame with a priority identifier and sends a maintenance request message to the main control platform of the large circular kiln. The degraded operation mode maintains the basic continuity of the dust removal function of the flow channel system, reducing the probability of dust removal link shutdown due to independent sensor failure. The motherboard power input of the adaptive control device 400 is equipped with a supercapacitor-based power-down retention circuit. When a voltage drop or power outage occurs in the workshop power grid, the power monitoring chip sends a power-down interrupt signal to the microcontroller core. Upon receiving the power-down interrupt signal, the microcontroller uses the charge energy released by the supercapacitor to write the absolute humidity value, tension variance, indigo dust accumulation load index, and the airflow kinetic energy duty cycle control word updated through closed-loop iteration, calculated for the current cycle, into the non-volatile ferroelectric random access memory (RAM). After the equipment is powered on again, the initialization routine reads the running breakpoint parameters from the RAM. By reconstructing the computational context of closed-loop control using breakpoint parameters, the fluctuations in cleaning efficiency caused by the re-accumulation of amplitude parameters after system restart are reduced, ensuring the continuous execution of the environmental control logic for indigo dust.

[0052] When dealing with specific working conditions of different weaving materials, the adaptive control device 400 exhibits corresponding parameter adjustment response characteristics. In the case of weaving all-cotton indigo denim fabric, the amount of short cotton fibers produced is large and highly hydrophilic. The increase in relative humidity acquired by the temperature and humidity probe 310 leads to a larger range in the absolute humidity value output by the physical parameter acquisition module 410. The indigo dust accumulation load index output by the dust accumulation assessment module 420 reaches the set load critical value, prompting the transient alternating cleaning module 440 to trigger airflow actions in the transient avoidance zone at an increased frequency. In the case of weaving blended indigo fabric containing polyester or lyocell filaments, the free fibers generated by filament breakage form a mesh-like entanglement within the guide needle track. The increase in the microscopic peaks of yarn friction resistance captured by the tension sensor 320 leads to an increase in the tension dispersion variance calculated by the physical parameter acquisition module 410. The dust accumulation assessment module 420 outputs a high-level indigo dust accumulation load index based on weighted multiplication logic. The closed-loop iterative module 450 detects the abnormal pressure drop slope caused by the filament entanglement and automatically increases the amplitude parameter of the peak positive pressure airflow, using the increased fluid kinetic energy to tear the fiber entanglement network.

[0053] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A self-cleaning flow channel system for preventing indigo dust accumulation on a large circular knitting machine's triangular base, comprising a flow channel body, an airflow generating device connected to the flow channel body, and a parameter acquisition device, characterized in that, It also includes an adaptive control device connected to the airflow generating device and the parameter acquisition device; The adaptive control device includes: The physical parameter acquisition module is used to acquire ambient temperature and humidity parameters and yarn tension fluctuation parameters through the parameter acquisition device. The dust accumulation assessment module is used to calculate the indigo dust accumulation load index based on the ambient temperature and humidity parameters and the yarn tension fluctuation parameters. The timing phase locking module is used to acquire the rotation signal of the main spindle of the circular knitting machine and lock the transient avoidance range of the knitting needle of the circular knitting machine in a non-looping state based on the rotation signal of the main spindle of the circular knitting machine. The transient alternating cleaning module is used to control the airflow generator to output positive and negative pressure alternating pulse airflow to the flow channel body within the transient avoidance range when the indigo dust accumulation load index is greater than the set load threshold, so as to strip and discharge the indigo dust in the flow channel body.

2. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 1, characterized in that, The parameter acquisition device includes a temperature and humidity probe located in the working area of ​​the circular knitting machine and a tension sensor located on the yarn feeding path of the circular knitting machine.

3. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 2, characterized in that, The flow channel body includes a main dust discharge ring groove arranged around the bottom of the triangular seat and a plurality of dust suction micro-holes connected to the main dust discharge ring groove.

4. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 3, characterized in that, The airflow generating device includes a high-pressure blowing pump connected to the air inlet of the main dust discharge ring groove and a negative pressure suction pump connected to the air outlet of the main dust discharge ring groove.

5. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 4, characterized in that, The parameter acquisition device also includes a micro differential pressure sensor probe located inside the main dust discharge ring groove, used to sense pressure drop fluctuation data inside the flow channel body.

6. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 5, characterized in that, The physical parameter acquisition module obtains the absolute humidity value through the temperature and humidity probe and the tension discrete variance through the tension sensor; The dust accumulation assessment module multiplies and weights the absolute humidity value with the tension discrete variance to generate the indigo dust accumulation load index.

7. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 6, characterized in that, The timing phase locking module analyzes the rotation signal of the main spindle of the large circular knitting machine, extracts the spindle rotation pulse, compares the spindle rotation pulse with the pre-stored knitting needle kinematic model, identifies the non-interference gap phase in which all knitting needles leave the press point and have not entered the subsequent yarn padding action, and marks the time period between the start clock point and the end clock point of the non-interference gap phase as the transient avoidance interval.

8. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 7, characterized in that, At the starting clock point, the transient alternating cleaning module controls the high-pressure air pump to output a peak positive pressure airflow, forcing the indigo dust adhering to the inner wall to undergo normal detachment displacement. After the peak positive pressure airflow output ends, the negative pressure suction pump is controlled to increase sharply to the peak negative pressure state, and the indigo dust that has undergone normal shearing displacement is extracted by using fluid shear force.

9. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 8, characterized in that, The transient alternating cleaning module also calculates the positive pressure residence time based on the duration of the transient avoidance zone; If the duration is shortened, the driving frequency of the high-pressure air pump is increased simultaneously and the positive pressure residence time is shortened, so that the positive and negative pressure switching action is completed before the end clock point.

10. The self-cleaning flow channel system for preventing indigo dust accumulation on the triangular seat of a large circular knitting machine according to claim 9, characterized in that, The adaptive control device also includes a closed-loop iterative module; After the transient avoidance interval ends, the closed-loop iteration module calls the micro-differential pressure sensor probe to obtain the pressure drop slope of the cleaned flow channel. If it is determined that the pressure drop slope of the cleaned flow channel does not meet the standard, the amplitude parameter of the subsequent peak positive pressure airflow is automatically increased.

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