CN108189556B - Flexographic printing machine control system and method - Google Patents
Flexographic printing machine control system and method Download PDFInfo
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- CN108189556B CN108189556B CN201711287787.4A CN201711287787A CN108189556B CN 108189556 B CN108189556 B CN 108189556B CN 201711287787 A CN201711287787 A CN 201711287787A CN 108189556 B CN108189556 B CN 108189556B
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- driver
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- flexographic printing
- speed
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000012937 correction Methods 0.000 claims description 9
- 238000004171 remote diagnosis Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000001133 acceleration Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/24—Rotary letterpress machines for flexographic printing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention discloses a control system and a method of a flexographic printing machine, wherein the system comprises: the device comprises a control panel, a motion controller, a driver, a servo motor, a flexographic printing machine with a pre-registration function and an I/O expansion module, wherein the control panel, the driver and the servo motor are respectively multiple, the flexographic printing machine comprises multiple shafts, each driver is connected with one servo motor, each servo motor is connected with one shaft of the flexographic printing machine, and the I/O expansion module is connected with the motion controller; the working modes of the servo motors are position interpolation modes. The beneficial effects of the invention are as follows: the torque value can be obtained through the current of the servo motor, the torque value is controlled to be balanced with the resistance and the actual tension value, so that the tension control precision of the paper feeding and discharging shaft is improved, the printing precision is improved, the pre-alignment function of the flexographic printing machine is realized before printing, the waste is greatly reduced, and the acceleration and deceleration of the servo motor are ensured to be free of waste by a position interpolation mode of the servo motor.
Description
Technical Field
The invention relates to the technical field of printing equipment, in particular to a flexographic printing machine control system and method.
Background
Along with the development of industrial automation, requirements on equipment and printed products are increased, and a flexographic printing process is widely applied because of the advantages of health, environmental protection, high efficiency, energy saving, low cost and the like, while a flexographic printing machine is special equipment for printing paper products, and the traditional flexographic printing equipment has the problems of low tension control precision, more waste materials, low printing precision and the like.
Disclosure of Invention
The invention provides a flexographic printing machine control system and a method, which solve the technical problems in the prior art.
The technical scheme for solving the technical problems is as follows:
a flexographic printing press control system comprising: the device comprises a control panel, a motion controller, a driver, a servo motor, a flexographic printing machine with a pre-registration function and an I/O expansion module, wherein the control panel, the driver and the servo motor are respectively multiple, the flexographic printing machine comprises multiple shafts, each driver is connected with one servo motor, each servo motor is connected with one shaft of the flexographic printing machine, and the I/O expansion module is connected with the motion controller;
The control panels are used for monitoring the working states of the motion controller and the drivers; the motion controller is used for sending control instructions to a plurality of drivers; the plurality of drivers are used for respectively driving the plurality of servo motors according to the control instructions; the plurality of servo motors are used for controlling a plurality of shafts of the flexographic printing machine; the I/O expansion module is used for controlling the digital quantity input and output of the motion controller;
the working mode of the servo motor is a position interpolation mode.
The beneficial effects of the invention are as follows: the torque value can be obtained through the current of the servo motor, the torque value is controlled to be balanced with the resistance and the actual tension value, so that the tension control precision of the paper feeding and discharging shaft is improved, the printing precision is improved, the pre-alignment function of the flexographic printing machine is realized before printing, the waste is greatly reduced, and the acceleration and deceleration of the servo motor are ensured to be free of waste by a position interpolation mode of the servo motor.
On the basis of the technical scheme, the invention can be improved as follows.
Preferably, the control panel is a touch screen.
Preferably, a plurality of the control panels are connected to the motion controller via an industrial router and a TCP/IP protocol, the industrial router also being used for remote diagnostics of the flexographic printing machine control system.
Preferably, the motion controller is connected with a plurality of drivers and the I/O expansion modules through an EtherCAT bus.
Preferably, the method further comprises: and each driver is connected with one correcting unit.
Preferably, the method further comprises: and the PID controller is connected with the driver.
Preferably, the plurality of shafts includes: a paper feeding shaft, a paper discharging shaft and eight color group shafts.
A flexographic printing machine control method comprising:
S1, a plurality of control panels send control instructions to a plurality of drivers through a motion controller, and digital quantity input and output of the motion controller are controlled through an I/O expansion module;
S2, the plurality of drivers respectively drive the plurality of servo motors according to the control instruction, and the plurality of servo motors control the plurality of shafts of the flexographic printing machine with the pre-registration function to move, so that printing is realized.
Preferably, the method further comprises:
s3, performing remote diagnosis on the control panels, the motion controller, the drivers, the servo motors, the flexographic printing machine and the I/O expansion module through an industrial router.
Preferably, the control panel is a touch screen.
Drawings
FIG. 1 is a schematic diagram of a control system for a flexographic printing press according to an embodiment of the present invention;
FIG. 2 is a closed loop block diagram of a correction unit according to another embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the operation of tension control according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for controlling a flexographic printing press according to another embodiment of the present invention;
fig. 5 is a flowchart of a control method of a flexographic printing machine according to another embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, a flexographic printing machine control system comprising: the device comprises a control panel 1, a motion controller 2, a driver 3, a servo motor 4, a flexographic printing machine 5 with a pre-registration function and an I/O expansion module 6 which are sequentially connected, wherein the control panel 1, the driver 3 and the servo motor 4 are respectively multiple, the flexographic printing machine 5 comprises multiple shafts, each driver 3 is connected with one servo motor 4, each servo motor 4 is connected with one shaft of the flexographic printing machine 5, and the I/O expansion module 6 is connected with the motion controller 2;
the operation mode of the servo motor 4 is a position interpolation mode.
The plurality of control panels 1 are used for monitoring the working states of the motion controller 2 and the plurality of drivers 3; the motion controller 2 is configured to send control instructions to the plurality of drivers 3; the plurality of drivers 3 are used for driving the plurality of servo motors 4 respectively according to control instructions; a plurality of servo motors 4 for controlling a plurality of shaft movements of the flexographic printing machine 5; the I/O expansion module 6 is used to control the digital input and output of the motion controller 2.
Preferably, the control panel 1 is a touch screen.
Preferably, the plurality of control panels 1 are connected to the motion controller through an industrial router and a TCP/IP protocol. The industrial router is also used for remote diagnostics of the flexographic printing press control system.
Preferably, the motion controller 2 connects the plurality of drivers 3 and the I/O expansion module 6 through an EtherCAT bus.
Preferably, the method further comprises: and each driver is connected with one correcting unit.
As shown in fig. 2, the correction unit receives an encoder increment signal output by the driver, compensates a speed offset according to the encoder increment signal, if the speed offset is a positive number, the compensation value is a difference between the virtual spindle speed and the actual speed, if the speed offset is a negative number, the compensation value is a difference between the actual speed and the virtual spindle, and if the speed offset is zero, the compensation value is 0; the virtual spindle speed compensation value is combined with a virtual spindle speed command and sent to a driver, and the driver, the encoder and the correction unit form a closed loop for adjusting the running speed of the motor.
Preferably, the method further comprises: and the PID controller is connected with the plurality of drivers.
Preferably, the plurality of shafts comprises: a paper feeding shaft, a paper discharging shaft and eight color group shafts.
As shown in fig. 3, a tension deviation value is obtained according to a tension command and tension feedback obtained through a tension sensor or a tension swing rod, a PID controller sends a tension control speed command according to the tension deviation value, the tension control speed command is combined with a virtual spindle speed command and sent to a driver to control a torque value obtained by current of a motor connected with the driver to be balanced with resistance and an actual tension value, so that tension control precision of a paper feeding shaft of a flexographic printing machine is improved, the tension precision of the flexographic printing machine can be within 0.5KG, and printing precision is 0.01-0.05mm.
A user can send control instructions to the motion controller through a plurality of touch screens, the touch screens are connected with each other through a multi-screen interconnection of the industrial router, and the touch screens are connected with the motion controller through a Modbus TCP/IP mode; after receiving the control instruction, the motion controller sends a driving instruction to each driver through the EtherCAT bus, and the I/O expansion module controls the digital quantity input and output of the motion controller, each driver drives each servo motor to move, and the servo motor drives the flexographic printing machine to print. The industrial router can also be remotely connected with a device manufacturer to remotely diagnose the whole control system.
Pre-registration function of flexographic printing machine: the first axis of the color set of the printer is used as a standard, so that the sum of the distance between the first axis and the second axis and the position error of the second axis is an integral multiple of the length of the printing plate, and the error of the color set of the printing is eliminated. The position interpolation mode is a mode of operation of the servo motor, and is set in a driver that controls the motor, by sending a position command to the motor every 2ms until the target position is reached.
The touch screen HMI is connected with the upper controller in a Modbus TCP/IP mode and is used for monitoring the states of the motion controller and the driver; the motion controller is in communication connection with the driver through EtherCAT, and is used for sending a command to the driver, and the driver returns the relevant state information to the motion controller; the driver is connected with the servo motor through a power line and a signal line, and the motor is controlled to act by the driver; the motion controller is connected with the I/O expansion module through EtherCAT communication and is used for controlling the input and output of digital quantity on the equipment; the whole control system is connected through the industrial router to carry out remote diagnosis. Buttons, indicator lights, etc. external to the motion controller are directly connected to the motion controller I/O module or I/O expansion module.
The control system has the advantages that:
1. Tension control precision of paper feeding shaft: the actual tension value is obtained by a tension sensor or a tension swing rod of the system, and the torque value (the corresponding force is obtained by converting the ratio of the torque value to the coil diameter) is obtained through the current of the motor, so that the torque value is balanced with the resistance and the actual tension value.
2. Printing precision: the error in the acceleration and deceleration process is 0.05mm, and the error in uniform motion is 0.01 mm; the error of the existing equipment is 0.15mm.
3. Pre-registration function: pre-alignment prior to printing greatly reduces waste.
4. Position interpolation mode: the acceleration and deceleration is guaranteed to have no waste.
5. The tension accuracy can be within 0.5 KG.
As shown in fig. 4, a flexographic printing machine control method includes:
S1, a plurality of control panels send control instructions to a plurality of drivers through a motion controller, and digital quantity input and output of the motion controller are controlled through an I/O expansion module;
S2, the plurality of drivers respectively drive the plurality of servo motors according to the control instruction, and the plurality of servo motors control the plurality of shafts of the flexographic printing machine with the pre-registration function to move, so that printing is realized.
As shown in fig. 5, after step S2 in fig. 4, the method further includes:
s3, performing remote diagnosis on the plurality of control panels, the motion controller, the plurality of drivers, the plurality of servo motors, the flexographic printing machine and the I/O expansion module through the industrial router.
Specifically, the control panel is a touch screen.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A flexographic printing press control system comprising: the device comprises a control panel, a motion controller, a driver, a servo motor, a flexographic printing machine with a pre-registration function and an I/O expansion module, wherein the control panel, the driver and the servo motor are respectively multiple, the flexographic printing machine comprises multiple shafts, each driver is connected with one servo motor, each servo motor is connected with one shaft of the flexographic printing machine, and the I/O expansion module is connected with the motion controller;
The control panels are used for monitoring the working states of the motion controller and the drivers; the motion controller is used for sending control instructions to a plurality of drivers; the plurality of drivers are used for respectively driving the plurality of servo motors according to the control instructions; the plurality of servo motors are used for controlling a plurality of shaft movements of the flexographic printing machine; the I/O expansion module is used for controlling the digital quantity input and output of the motion controller;
the working mode of the servo motor is a position interpolation mode;
The control panels are connected with the motion controller through an industrial router and a TCP/IP protocol, and the industrial router is also used for remotely diagnosing the control system of the flexographic printing machine;
Further comprises: a plurality of correction units, each driver being connected to one correction unit;
The correction unit receives an encoder increment signal output by the driver, compensates the speed offset according to the encoder increment signal, if the speed offset is a positive number, the compensation value is the difference between the virtual spindle speed and the actual speed, if the speed offset is a negative number, the compensation value is the difference between the actual speed and the virtual spindle speed, and if the speed offset is zero, the compensation value is 0; the virtual spindle speed compensation value is combined with a virtual spindle speed command and sent to a driver, and the driver, an encoder and a correction unit form a closed loop to adjust the running speed of the motor;
further comprises: the PID controller is connected with the driver;
According to the tension instruction and tension feedback obtained through a tension sensor or a tension swing rod, a PID controller sends a tension control speed instruction according to the tension deviation value, and the tension control speed instruction is combined with a virtual main shaft speed instruction and sent to a driver so as to control the balance between a torque value and resistance obtained by current of a motor connected with the driver and an actual tension value, so that the tension control precision of a paper feeding shaft of the flexible board printer is improved;
the industrial router can also be remotely connected with a device manufacturer to remotely diagnose the whole control system.
2. The flexographic printing press control system of claim 1 wherein the control panel is a touch screen.
3. The flexographic printing press control system of claim 1 wherein the motion controller connects the plurality of drivers and the I/O expansion module via an EtherCAT bus.
4. The flexographic printing press control system of claim 1 wherein the plurality of shafts comprises: a paper feeding shaft, a paper discharging shaft and eight color group shafts.
5. A flexographic printing machine control method, applied to the system of claim 1, comprising:
S1, a plurality of control panels send control instructions to a plurality of drivers through a motion controller, and digital quantity input and output of the motion controller are controlled through an I/O expansion module;
S2, respectively driving a plurality of servo motors by a plurality of drivers according to the control instruction, wherein the servo motors control a plurality of shafts of the flexographic printing machine with the pre-registration function to move so as to realize printing;
S3, performing remote diagnosis on the control panels, the motion controller, the drivers, the servo motors, the flexographic printing machine and the I/O expansion module through an industrial router;
s4, receiving an encoder increment signal output by a driver through a correction unit, compensating the speed offset according to the encoder increment signal, wherein if the speed offset is positive, the compensation value is the difference value between the virtual spindle speed and the actual speed, if the speed offset is negative, the compensation value is the difference value between the actual speed and the virtual spindle speed, and if the speed offset is zero, the compensation value is 0; the virtual spindle speed compensation value is combined with a virtual spindle speed command and sent to a driver, and the driver, an encoder and a correction unit form a closed loop to adjust the running speed of the motor;
s5, a PID controller obtains a tension deviation value according to a tension instruction and tension feedback obtained through a tension sensor or a tension swing rod, and sends a tension control speed instruction according to the tension deviation value, wherein the tension control speed instruction is combined with a virtual spindle speed instruction and sent to a driver so as to control a torque value obtained by current of a motor connected with the driver to be balanced with resistance and an actual tension value, so that the tension control precision of a paper feeding shaft of the flexible plate printer is improved;
S6, the equipment manufacturer carries out remote diagnosis on the whole control system through the industrial router.
6. The method of claim 5, wherein the control panel is a touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711287787.4A CN108189556B (en) | 2017-12-07 | 2017-12-07 | Flexographic printing machine control system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711287787.4A CN108189556B (en) | 2017-12-07 | 2017-12-07 | Flexographic printing machine control system and method |
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| CN108189556A CN108189556A (en) | 2018-06-22 |
| CN108189556B true CN108189556B (en) | 2024-04-23 |
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| CN201711287787.4A Active CN108189556B (en) | 2017-12-07 | 2017-12-07 | Flexographic printing machine control system and method |
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