CN116001424A - Rotary screen printing combination machine for printing and dyeing equipment and control method thereof - Google Patents
Rotary screen printing combination machine for printing and dyeing equipment and control method thereof Download PDFInfo
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- CN116001424A CN116001424A CN202211639374.9A CN202211639374A CN116001424A CN 116001424 A CN116001424 A CN 116001424A CN 202211639374 A CN202211639374 A CN 202211639374A CN 116001424 A CN116001424 A CN 116001424A
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- 238000007639 printing Methods 0.000 title claims abstract description 207
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010022 rotary screen printing Methods 0.000 title claims abstract description 32
- 238000004043 dyeing Methods 0.000 title claims description 21
- 239000004744 fabric Substances 0.000 claims abstract description 204
- 230000007246 mechanism Effects 0.000 claims abstract description 71
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 230000001133 acceleration Effects 0.000 claims description 22
- 238000005070 sampling Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- 230000003993 interaction Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 238000009940 knitting Methods 0.000 abstract description 27
- 239000004753 textile Substances 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
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Abstract
The invention relates to the technical field of textile printing equipment, and discloses a rotary screen printing combination machine for printing equipment and a control method thereof, wherein the rotary screen printing combination machine comprises the following components: the cloth feeding mechanism is used for conveying the knitting elastic cloth and carrying out positioning and dust removal treatment on the knitting elastic cloth; the cloth feeding printing mechanism is connected with the cloth feeding mechanism, receives the knitted elastic cloth conveyed by the cloth feeding mechanism and carries out a printing process on the knitted elastic cloth; the speed regulating mechanism is connected with the cloth feeding printing mechanism and used for controlling the conveying speed of the cloth feeding printing mechanism; the speed regulating mechanism detects the first speed of the printing conduction band operation of the cloth feeding and printing mechanism in real time, and controls the second speed of the knitted elastic cloth conveying so that the knitted elastic cloth can operate according to the printing process requirement. By the device and the control method, the low-tension operation of the knitted elastic fabric is controlled, so that the knitted elastic fabric can be stably transported and is not deformed before printing.
Description
Technical Field
The invention relates to the technical field of textile printing equipment, in particular to a rotary screen printing combination machine for printing and dyeing equipment and a control method thereof.
Background
In the printing process, the rotary screen printing combination machine mainly has two synchronizations: the first is the synchronization between the rotation of the cylinder and the movement of the printing belt. The second synchronization is the synchronization among the cloth feeding unit, the printing guide belt, the drying room conveyor belt and the cloth falling unit, and the synchronization among the cloth feeding unit, the printing guide belt, the drying room conveyor belt and the cloth falling unit ensures that the fabric runs stably when continuously passing through the four units, and the printing of the fabric is guaranteed.
The four units of cloth feeding, printing conduction band, drying room conveyer belt and cropping are all driven by AC asynchronous variable frequency motor, and are controlled by vector type frequency converter. And the transmission of the conduction band printing motor is used as a master command signal.
The knitted elastic fabric has strong elasticity and extensibility, so that the feedback control of the tension frame can not be increased between the fabric feeding unit and the printing conduction band. The cloth feeding control of the current rotary screen printing combination machine is mostly based on a master-slave motion control mode, namely, a cloth feeding motor is adopted to follow the follow-up control of the speed of a printing conduction band motor.
The master-slave speed control mode cannot adapt to synchronous control with load change: the rotary speed fluctuation caused by the load change of the feeding overfeeding motor and the printing conduction band motor of the rotary screen printing combination machine at a constant speed can not be solved; the rotary consistency of the feeding overfeeding motor and the printing conduction band motor of the rotary screen printing combination machine in the speed increasing and decreasing motion cannot be solved.
Disclosure of Invention
The invention aims to overcome one or more of the prior technical problems and provides a rotary screen printing combination machine for printing and dyeing equipment and a control method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a rotary screen printing combination machine for printing and dyeing equipment, comprising:
the cloth feeding mechanism is used for conveying the knitting elastic cloth and carrying out positioning and dust removal treatment on the knitting elastic cloth;
the cloth feeding printing mechanism is connected with the cloth feeding mechanism, receives the knitted elastic cloth conveyed by the cloth feeding mechanism and carries out a printing process on the knitted elastic cloth;
the speed regulating mechanism is connected with the cloth feeding printing mechanism and used for controlling the conveying speed of the cloth feeding printing mechanism;
the speed regulating mechanism detects the first speed of the operation of the conveyor belt in the cloth feeding and printing mechanism in real time, and adjusts the second speed of the knitted elastic cloth, so that the second speed of the knitted elastic cloth is consistent with the first speed.
Preferably, the cloth feeding printing mechanism comprises a cloth feeding overfeeding roller, a pressing roller, a printing conduction band, a printing rotary screen, a printing conduction band driving roller, a printing conduction band driven roller and a cloth feeding expanding roller;
the printing guide belt is respectively sleeved on the printing guide belt driving roller and the printing guide belt driven roller, and the printing guide belt driving roller and the printing guide belt driven roller are respectively arranged at two ends of the printing guide belt;
the press roll and the printing rotary screen are arranged at the top of the printing guide belt, the printing rotary screen is arranged between the printing guide belt driving roll and the printing guide belt driven roll, and the press roll is arranged between the printing guide belt driving roll and the printing rotary screen;
the printing conduction band driving roller is arranged close to the cloth feeding mechanism, and the cloth feeding overfeeding roller is arranged between the cloth feeding mechanism and the printing conduction band driving roller;
the cloth feeding expanding roller is arranged between the cloth feeding overfeeding roller and the printing conduction band driving roller.
Preferably, the speed regulating mechanism comprises a cloth feeding overfeeding driver for driving the cloth feeding overfeeding roller to operate, a printing guide belt driver for driving the printing guide belt driving roller to operate, an encoder arranged outside the printing guide belt driven roller and operated together with the printing guide belt driven roller, and a controller in communication connection with the cloth feeding overfeeding driver, the printing guide belt driver and the encoder respectively;
the controller adjusts the second speed controlled by the cloth feeding overfeeding driver to enable the second speed to be consistent with the first speed.
Preferably, the cloth feeding mechanism comprises a dust removing device for removing dust from the knitting elastic cloth and a positioning device which is arranged behind the dust removing device and is used for positioning the knitting elastic cloth;
the cloth feeding overfeeding roller is arranged at the rear of the conveying of the positioning device.
Preferably, the speed regulating mechanism further comprises a man-machine interaction interface which is arranged on the outer side of the cloth feeding overfeeding roller and used for controlling the rotating speed of the cloth feeding overfeeding roller.
In order to achieve the purpose, the rotary screen printing combination machine for the printing and dyeing equipment further comprises a drying mechanism which is arranged behind the feeding and printing mechanism and used for drying the printed knitted elastic fabric.
In order to achieve the above object, the present invention further provides a control method of a rotary screen printing combination machine for printing and dyeing equipment, including:
setting overfeeding quantity of a second speed of feeding cloth overfeeding roller operation relative to a first speed of printing guide belt operation on a human-computer interaction interface;
the controller calculates the first speed of the printing conduction band operation by detecting the real-time pulse number of the encoder;
the controller detects the moment of the cloth feeding overfeeding driver in real time, calculates the front-back variation of the moment in unit time, namely calculates the moment acceleration of the cloth feeding overfeeding driver;
calculating the speed compensation quantity of the cloth feeding overfeeding driver through the moment acceleration compensation algorithm according to the moment acceleration;
calculating the second speed of the feeding and overfeeding driver by the overfeeding amount and the speed compensation amount based on the first speed;
the controller adjusts the feeding overfeeding driver according to the second speed, so as to control the second speed for conveying the knitting elastic cloth to be consistent with the first speed.
Preferably, the calculation formula of the first speed is:
wherein u is 1 For a first speed of operation of the print guide belt,p is the pulse number of the encoder at the time T, the encoder is 5000 lines, L 1 And T is the unit time for the perimeter of the printing conduction band driving roller.
Preferably, the moment acceleration compensation amount integral separation control algorithm is as follows:
wherein: u (u) k Representing the compensation amount of the calculation output at the kth sampling time, K p Representing the ratio coefficient, the value range is 0.1-100.0, T k Representing moment variation of calculation output at the kth sampling moment; beta represents the switching coefficient of the integral term, K i Represents integral coefficient, the value range is 0.1-360.0,
representing the sum of moment variation amounts calculated and output at sampling moments of 0, 1, 2, … and K times, K d Representing differential coefficient, the value range is 0.01-10.00, T k-1 The moment variation amount calculated and output at the k-1 sampling time is shown, and epsilon shows the moment variation set threshold.
Preferably, the calculation formula of the second speed is:
u 2 ＝u 1 (1+Δu)+u k
wherein u is 2 For the second speed of feeding cloth and overfeeding the roller, u 1 For the first speed of the operation of the printing conduction band, deltau is the overfeeding quantity set on the man-machine interaction interface, u k The speed compensation quantity of the feeding and overfeeding driver is obtained.
Based on the above, the invention has the beneficial effects that:
1. according to the scheme, the positioning device is arranged at the front part of the integral device, so that the knitted elastic fabric can be positioned, and left-right deviation in the operation of the knitted elastic fabric is prevented; meanwhile, the dust removing device is arranged, so that the knitted elastic fabric can be subjected to dust removing treatment, and the influence on printing effect caused by dust falling on the knitted elastic fabric is prevented;
2. according to the scheme, the encoder is arranged on the outer side of the printing guide belt driven roller, the shaft of the encoder rotates together with the printing guide belt driven roller, the running speed of the printing guide belt is truly reflected, and the shake of the printing guide belt driving roller is overcome;
3. according to the scheme of the invention, the shaft of the encoder and the printing guide belt driven roller rotate together, and in the printing process, the controller can rapidly detect and rapidly control the influence of the motor characteristics in the process of increasing and decreasing speed no matter the load of the printing guide belt motor changes or the printing process moves;
4. according to the scheme provided by the invention, the controller detects the variation trend and the variation of the knitted elastic fabric before printing in real time, and the motion state of the feeding fabric overfeeding motor is accurately adjusted by adopting a moment acceleration compensation algorithm, so that the warp direction of the knitted elastic fabric is ensured to be in a low tension state before printing, the warp direction consistency is maintained, and the knitted elastic fabric is prevented from deforming;
5. according to the scheme of the invention, the weft friction force is generated between the knitted elastic fabric and the surface of the fabric feeding expanding roller during operation, and the crease resistance and crease removal of the fabric are expanded, so that the knitted elastic fabric is flatly operated to the printing process gate width;
6. by the scheme of the invention, the speed regulating mechanism is combined with the rotary screen printing process, so that the rotary screen printing machine can adapt to the characteristics of multiple varieties, multiple patterns and small batches of printed cloth, is easy to operate, has higher control precision and reliability, and realizes the stable operation of the knitted elastic cloth in the printing process.
Drawings
FIG. 1 schematically shows an overall structure of a rotary screen printing combination machine for printing and dyeing equipment according to one embodiment of the invention;
FIG. 2 schematically illustrates a flow chart of a method of controlling a rotary screen printing press for a printing apparatus according to one embodiment of the invention;
FIG. 3 schematically shows a flow chart of a moment acceleration compensation amount integration and separation control algorithm for cloth feeding overfeeding according to one embodiment of the invention.
Detailed Description
The present disclosure will now be discussed with reference to exemplary embodiments, it being understood that the embodiments discussed are merely for the purpose of enabling those of ordinary skill in the art to better understand and thus practice the present disclosure and do not imply any limitation to the scope of the present disclosure.
As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The terms "based on" and "based at least in part on" are to be construed as "at least one embodiment.
Fig. 1 schematically illustrates an overall structure of a rotary screen printing machine for printing and dyeing equipment according to one embodiment of the invention, as shown in fig. 1, the rotary screen printing machine for printing and dyeing equipment of the invention includes:
a cloth feeding mechanism 1, a cloth feeding printing mechanism 2, a speed regulating mechanism 3 and a drying mechanism 4;
the discharging end of the cloth feeding mechanism 1 is connected with the feeding end of the cloth feeding printing mechanism 2, and the cloth feeding mechanism 1 is used for conveying the knitting elastic cloth and carrying out positioning and dust removal treatment on the knitting elastic cloth;
the discharging end of the cloth feeding printing mechanism 2 is connected with the feeding end of the drying mechanism 4, the knitted elastic cloth conveyed by the cloth feeding mechanism 1 is received, printing operation is carried out on the knitted elastic cloth, and then the knitted elastic cloth is conveyed to the drying mechanism 4 for drying, so that the whole work flow is completed.
The speed regulating mechanism 3 is arranged at the feeding end and the discharging end of the feeding and printing mechanism 2, can detect the conveying speed of the knitting elastic cloth and the printing speed of the knitting elastic cloth respectively, control the conveying speed of the knitting elastic cloth to be consistent with the printing speed of the knitting elastic cloth, avoid the tension of the knitting elastic cloth to be too high due to the asynchronous movement of the knitting elastic cloth and the printing speed of the knitting elastic cloth, and avoid the wrinkling of the knitting elastic cloth due to the insufficient tension.
Specifically, the cloth feeding mechanism 1 comprises a dust removing device 101 and a positioning device 102, wherein the dust removing device 101 is arranged at the conveying front end of the positioning device 102, and can remove dust from the knitted elastic cloth, so that the neatness of the knitted elastic cloth is ensured, and the follow-up printing operation cannot cause incomplete printing due to dust;
the positioning device 102 can adjust the position of the knitting elastic fabric to prevent the knitting elastic fabric from deviating left and right in operation.
The cloth feeding mechanism 1 further comprises a cloth feeding frame 103, the dust removing device 101 and the positioning device 102 are fixed on the cloth feeding frame 103 through bolts, the cloth feeding frame 103 is connected with the cloth feeding printing mechanism 2, and when the cloth feeding frame 103 runs, knitting elastic cloth is conveyed to the cloth feeding printing mechanism 2 along with the running of the cloth feeding frame 103.
Further, the cloth feeding and printing mechanism 2 comprises a cloth feeding overfeeding roller 201, a pressing roller 202, a printing guide belt 203, a printing rotary screen 204, a printing guide belt driving roller 205 and a printing guide belt driven roller 206;
the feeding overfeed roller 201 is arranged at the rear of the conveying of the positioning device 102, two side supports are fixed between the feeding end of the printing conduction band 203 and the positioning device 102, and the knitting elastic cloth is conveyed to the printing conduction band 203 in a low tension stable non-deformation state by the running of the feeding overfeed roller 201.
The press roller 202 and the printing rotary screen 204 are arranged above the printing guide belt 203, bearing seats at two sides of the press roller 202 are fixed at the discharge end of the printing guide belt 203, and the printing rotary screen 204 is arranged between the feed end and the discharge end of the printing guide belt 203;
the press roller 202 presses and attaches the knitted elastic fabric conveyed by the fabric feeding overfeeding roller 201 to the printing conduction band 203, so that synchronous transportation of the knitted elastic fabric and the printing conduction band 203 is realized; a plurality of printing circular screens 204 are arranged, and the knitted elastic fabric positioned on the printing conduction band 203 is printed and dyed to perform process printing; the printing cylinder 204 can be freely selected according to the color register number of the printing process.
The printing conduction band 203 is sleeved on the printing conduction band driving roller 205 and the printing conduction band driven roller 206, the printing conduction band driving roller 205 is arranged at one end close to the cloth feeding overfeeding roller 201, the printing conduction band driven roller 206 is arranged at one end far away from the cloth feeding overfeeding roller 201, the printing conduction band 203 is annularly arranged to form a closed loop, the printing conduction band 203 is driven to run through the printing conduction band driving roller 205, the knitting elastic cloth positioned on the printing conduction band 203 is conveyed, and meanwhile, the printing conduction band driven roller 206 is also driven to rotate together, and at the moment, the conveying speed of the knitting elastic cloth on the printing conduction band 203 is completely consistent with the conveying speed of the printing conduction band 203.
Further, the cloth feeding printing mechanism 2 further comprises a cloth feeding expanding roller 207, which is located between the cloth feeding overfeeding roller 201 and the pressing roller 202, and bearing seats at two sides of the cloth feeding expanding roller 207 are fixed at the conveying front end of the printing guide belt 203, so that the width of the printing guide belt 203 can be expanded, the width of the printing guide belt 203 is increased, and the problem that the printing of a final finished product is incomplete due to the fact that knitting elastic cloth is wrinkled is avoided.
The speed regulating mechanism 3 comprises a cloth feeding overfeeding driver 301, a printing conduction band driver 302, an encoder 303 and a controller 304;
the cloth feeding overfeed driver 301 and the printing conduction band driver 302 are arranged on the outer side of the cloth feeding printing mechanism 2, the cloth feeding overfeed driver 301 is connected with a cloth feeding overfeed motor, and the cloth feeding overfeed motor is connected with the cloth feeding overfeed roller 201, so that the control of the cloth feeding overfeed driver 301 on the cloth feeding overfeed roller 201 is realized; the print guide belt driver 302 is connected with a print guide belt motor, and the print guide belt motor is connected with the print guide belt driving roller 205, so that the print guide belt driver 302 controls the print guide belt driving roller 205.
An encoder 303 is provided outside the print guide belt driven roller 206, the shaft of the encoder 303 is connected to the shaft of the print guide belt driven roller 206, and the encoder 303 can detect the running speed of the print guide belt 203 by rotating together with the print guide belt driven roller 206.
The controller 304 is arranged on the outer side of the cloth feeding printing mechanism 2 together with the cloth feeding overfeeding driver 301 and the printing conduction band driver 302, and is respectively in communication connection with the cloth feeding overfeeding driver 301, the printing conduction band driver 302 and the encoder 303, so that the real-time detection and control of the cloth feeding overfeeding driver 301, the printing conduction band driver 302 and the encoder 303 can be respectively carried out, the cloth feeding speed and the conveying speed in the cloth feeding printing mechanism 2 are ensured to be consistent, and the problems that the knitting elastic cloth is stretched due to the fact that the tension between the cloth feeding overfeeding roller 201 and the printing conduction band driving roller 205 is too high, the knitting elastic cloth is accumulated and overlapped due to the fact that the tension of the cloth feeding overfeeding roller 201 and the printing conduction band driving roller is too low, and the printing process is affected are prevented.
Further, the controller 304 is a SIO controller.
Further, the speed regulating mechanism 3 further comprises a man-machine interaction interface 305, wherein the man-machine interaction interface 305 is arranged on the outer side of the cloth feeding overfeeding roller 201 and is in communication connection with the cloth feeding overfeeding driver 301 by adopting RS 485; the user can set the overfeed amount of the cloth feeding overfeed motor on the man-machine interaction interface 305 according to the printing process requirement, the man-machine interaction interface 305 transmits a control signal to the cloth feeding overfeed driver 301, and the cloth feeding overfeed driver 301 drives the cloth feeding overfeed roller 201 to operate according to the set speed through the motor.
Further, the invention also provides a drying mechanism 4 which is arranged at the discharge end of the cloth feeding printing mechanism 2 and is connected with the cloth feeding printing mechanism 2 for drying the knitted elastic cloth after printing.
Through the device, the encoder 303 is arranged outside the printing guide belt driven roller 206, so that the conveying speed of the printing guide belt 203 can be detected in real time, and the controller 304 is respectively in communication connection with the feeding overfeeding driver 301, the printing guide belt driver 302 and the encoder 303, so that the running process of the whole printing rotary screen machine can be controlled, various operations including starting, stopping, increasing speed, reducing speed and the like can be performed, an operation instruction is sent to a CANbus, and meanwhile, the state information such as the speed, faults and the like of the printing rotary screen machine can be displayed in real time;
the running speed of the cloth feeding overfeeding roller 201 is automatically adjusted through data monitoring and self algorithm, overfeeding is not required to be manually adjusted at any time by a plurality of users, and the problems that the speed is low and the number of defective products is large due to manual cloth pulling are avoided.
Fig. 2 schematically shows a flowchart of a control method of a rotary screen printing combination machine for printing and dyeing equipment according to one embodiment of the invention, as shown in fig. 2:
in order to achieve the above object, the present invention further provides a control method of a rotary screen printing combination machine for printing and dyeing equipment, including:
step one, setting overfeeding quantity of a second speed of running of the cloth feeding overfeeding roller 201 relative to a first speed of running of the printing guide belt 203 on a human-computer interaction interface 305;
step two, the controller 304 calculates the first speed of the printing belt 203 by detecting the real-time pulse number of the encoder 303;
step three, the controller 304 detects the moment of the cloth feeding overfeeding driver 301 in real time, and calculates the front-back variation of the moment in unit time, namely, calculates the moment acceleration of the cloth feeding overfeeding driver 301;
step four, according to the moment acceleration, the speed compensation quantity of the overfeeding driver 301 is distributed through a moment acceleration compensation algorithm Ji Suanjin;
calculating a second speed of the feeding cloth overfeeding driver by overfeeding amount and speed compensation amount based on the first speed;
step six, the controller 304 adjusts the feeding overfeeding driver 301 according to the second speed, so as to control the second speed of the knitting elastic fabric conveying to be consistent with the first speed.
In step one, the overfeed amount of the second speed relative to the first speed of the feeding fabric overfeed roller 201 is set according to the printing process requirement of the manufacturer.
In the second step, the formula for calculating the first speed is:
wherein u is 1 For the first speed of the printing conduction band operation, the unit is meter/min, P is the pulse number of the encoder at the time T, the encoder is 5000 lines, L 1 And T is the unit time for the perimeter of the printing conduction band driving roller.
In the third step, the current of the feeding and overfeeding driver 301 is read, the moment variation of the feeding and overfeeding driver 301 is calculated, and the moment acceleration of the feeding and overfeeding driver 301 can be calculated, wherein the formula is as follows:
moment change = post-sampling period moment-pre-sampling period moment.
FIG. 3 schematically shows a flowchart of a moment acceleration compensation amount integration and separation control algorithm for feeding cloth overfeeding according to an embodiment of the invention, as shown in FIG. 3:
in the fourth step, the moment acceleration compensation amount integral separation control algorithm is as follows:
wherein: u (u) k The compensation quantity of the calculated output at the kth sampling moment is expressed in m/min, K p Representing a proportionality coefficient, in the range of 0.1 to 100.0, preferably 8.0, T k Representing moment variation of calculation output at the kth sampling moment; beta represents the switching coefficient of the integral term, K i Represents an integral coefficient, the value range is 0.1-360.0, preferably 3.5,
representing the sum of moment variation amounts calculated and output at sampling moments of 0, 1, 2, … and K times, K d Represents a differential coefficient in the range of 0.01 to 10.00, preferably 1.00, T k-1 The moment variation amount calculated and output at the k-1 sampling time is shown, and epsilon shows the moment variation set threshold. />
In order to improve the stability of the system and accelerate the dynamic corresponding speed of the system, the moment acceleration compensation algorithm adopts an integral separation method with the formula; setting a moment change threshold epsilon range, wherein when the moment change quantity of the cloth feeding motor driver 301 is smaller than epsilon, beta is equal to 1, and the formula simultaneously has proportional, integral and derivative algorithms, which are PID algorithms, and calculating moment acceleration compensation quantity by adopting the PID algorithm; when the moment variation of the cloth feeding motor driver 301 is greater than epsilon, beta is equal to 0, the above formula simultaneously has a proportional and derivative algorithm, no integral algorithm is adopted, the PD algorithm is adopted for calculating the moment acceleration compensation quantity by eliminating integral.
In the fifth step, the calculation formula of the second speed is:
u 2 ＝u 1 (1+Δu)+u k
wherein u is 2 The second speed of the feeding and overfeeding roller is expressed as m/min, u 1 For the first speed of the printing conduction band operation, the unit is meter/min, the delta u is overfeeding quantity set on a human-computer interaction interface, the unit is meter/min, and the u is k The unit is meter/min for the speed compensation of the feeding and overfeeding driver.
According to the operation command of the controller 304, according to the real-time speed of the printing conduction band 203 reacted by the encoder 303, the moment variation of the feeding and overfeeding driver 301 is combined, and the feeding and overfeeding motor is synchronously controlled through a moment acceleration compensation algorithm, so that the knitted elastic fabric runs synchronously with the printing conduction band 203 in a low tension and flat mode before printing.
The method comprehensively considers the trend of errors and error variation, adopts a control strategy of eliminating the errors based on the errors, accurately and timely compensates the feeding overfeeding motor, and can well realize synchronous control of feeding overfeeding of the knitted fabric in the rotary screen printing combination machine.
By the control method, when the loads of the feeding over-feeding motor and the printing conduction band motor are changed in the printing process of the knitted elastic fabric, moment acceleration is introduced between the feeding over-feeding motor and the printing conduction band motor, the compensation quantity is calculated by adopting a moment acceleration compensation quantity integration separation control algorithm, the feeding over-feeding driver 301 is compensated, the motion state of the feeding over-feeding motor is timely and accurately adjusted in real time, and therefore synchronization between the feeding over-feeding motor and the printing conduction band motor is achieved.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
It should be understood that, the sequence numbers of the steps in the summary and the embodiments of the present invention do not necessarily mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.
Claims (10)
1. A rotary screen printing combination machine for printing and dyeing equipment, characterized by comprising:
the cloth feeding mechanism (1) is used for conveying the knitted elastic cloth and carrying out positioning and dust removal treatment on the knitted elastic cloth;
the cloth feeding printing mechanism (2) is connected with the cloth feeding mechanism (1), receives the knitted elastic cloth conveyed by the cloth feeding mechanism (1), and carries out a printing process on the knitted elastic cloth;
the speed regulating mechanism (3) is connected with the cloth feeding printing mechanism (2) and is used for controlling the conveying speed of the cloth feeding printing mechanism (2);
the speed regulating mechanism (3) detects the first speed of the operation of the conveyor belt in the cloth feeding printing mechanism (2) in real time, and adjusts the second speed of the knitted elastic cloth conveying so that the second speed of the knitted elastic cloth is consistent with the first speed.
2. The rotary screen printing combination machine for printing equipment according to claim 1, characterized in that the feeding printing mechanism (2) comprises a feeding overfeed roller (201), a press roller (202), a printing guide belt (203), a printing rotary screen (204), a printing guide belt driving roller (205), a printing guide belt driven roller (206) and a feeding expanding roller (207);
the printing guide belt (203) is respectively sleeved on the printing guide belt driving roller (205) and the printing guide belt driven roller (206), and the printing guide belt driving roller (205) and the printing guide belt driven roller (206) are respectively arranged at two ends of the printing guide belt (203);
the press roll (202) and the printing rotary screen (204) are arranged at the top of the printing guide belt (203), the printing rotary screen (204) is arranged between the printing guide belt driving roll (205) and the printing guide belt driven roll (206), and the press roll (202) is arranged between the printing guide belt driving roll (205) and the printing rotary screen (204);
the printing conduction band driving roller (205) is arranged close to the cloth feeding mechanism (1), and the cloth feeding overfeeding roller (201) is arranged between the cloth feeding mechanism (1) and the printing conduction band driving roller (205);
the cloth feeding expanding roller (207) is arranged between the cloth feeding overfeeding roller (201) and the printing conduction band driving roller (205).
3. Rotary screen printing combination for printing and dyeing equipment according to claim 2, characterized in that the speed regulating mechanism (3) comprises a feed overfeed driver (301) driving the feed overfeed roller (201) to operate, a print guide belt driver (302) driving the print guide belt driving roller (205) to operate, an encoder (303) arranged outside the print guide belt driven roller (206) to follow the print guide belt driven roller (206) to operate together, and a controller (304) in communication with the feed overfeed driver (301), the print guide belt driver (302) and the encoder (303), respectively;
the controller (304) adjusts the second speed controlled by the cloth feeding overfeeding driver (301) to enable the second speed to be consistent with the first speed.
4. A rotary screen printing combination machine for printing and dyeing equipment according to claim 3, characterized in that the cloth feeding mechanism (1) comprises a dust removing device (101) for removing dust from the knitted elastic cloth and a positioning device (102) arranged behind the dust removing device (101) for positioning the knitted elastic cloth;
the cloth feeding overfeeding roller (201) is arranged behind the conveying of the positioning device (102).
5. The rotary screen printing combination machine for printing and dyeing equipment according to claim 4, characterized in that the speed regulating mechanism (3) further comprises a man-machine interaction interface (305) which is arranged outside the cloth feeding overfeed roller (201) and used for controlling the rotating speed of the cloth feeding overfeed roller (201).
6. Rotary screen printing combination machine for printing and dyeing equipment according to claim 5, characterized by the fact that it also comprises a drying mechanism (4) for drying the knitted elastic fabric after printing, arranged after the transport of the feeding printing mechanism (2).
7. A control method for a rotary screen printing combination machine of printing and dyeing equipment, characterized by comprising:
setting overfeeding quantity of a second speed of running of the cloth feeding overfeeding roller (201) relative to a first speed of running of the printing conduction band (203) on a human-computer interaction interface (305);
-the controller (304) calculates said first speed of operation of said print guide belt (203) by detecting the real-time number of pulses of the encoder (303);
the controller (304) detects the moment of the cloth feeding overfeeding driver (301) in real time, calculates the front-back variation of the moment in unit time, namely calculates the moment acceleration of the cloth feeding overfeeding driver (301);
calculating the speed compensation quantity of the cloth feeding overfeeding driver (301) through the moment acceleration compensation algorithm according to the moment acceleration;
calculating the second speed of operation of the feed fabric overfeed drive (301) from the overfeed amount and the speed compensation amount based on the first speed;
the controller (304) adjusts the feeding overfeeding driver (301) according to the second speed, so as to control the second speed of the knitted elastic fabric conveying to be consistent with the first speed.
8. The method for controlling a rotary screen printing combination machine for printing and dyeing equipment according to claim 7, wherein the first speed is calculated by the formula:
wherein u is 1 For the first speed of the printing conduction band operation, P is the pulse number of the encoder at the time T, the encoder is 5000 lines, L 1 And T is the unit time for the perimeter of the printing conduction band driving roller.
9. The control method of a rotary screen printing combination machine for printing and dyeing equipment according to claim 8, wherein the moment acceleration compensation quantity integral separation control algorithm is as follows:
wherein: u (u) k Representing the compensation amount of the calculation output at the kth sampling time, K p Representing the ratio coefficient, the value range is 0.1-100.0, T k Representing moment variation of calculation output at the kth sampling moment; beta represents the switching coefficient of the integral term, K i Represents integral coefficient, the value range is 0.1-360.0,
representing the sum of moment variation amounts calculated and output at sampling moments of 0, 1, 2, … and K times, K d Representing differential coefficient, the value range is 0.01-10.00, T k-1 The moment variation amount calculated and output at the k-1 sampling time is shown, and epsilon shows the moment variation set threshold.
10. The method for controlling a rotary screen printing combination machine for printing and dyeing equipment according to claim 9, wherein the calculation formula of the second speed is:
u 2 ＝u 1 (1+Δu)+u k
wherein u is 2 For the second speed of feeding cloth and overfeeding the roller, u 1 For the first speed of the operation of the printing conduction band, deltau is the overfeeding quantity set on the man-machine interaction interface, u k The speed compensation quantity of the feeding and overfeeding driver is obtained.
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