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2022-09-22
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Delta circular printing machine system application solution

Abstract: This paper mainly introduces the overall system solution of circular printing machine based on Delta automation products. The overall system solution of delta round printing machine mainly realizes the i/o control of various color systems through the industrial control network DeviceNet; Read and write servo data through CANopen; At the same time, the synchronous control of 12 color servo is realized through the unique pulse by pass function. Through the actual production verification on site, Delta's perfect industrial control network, especially the unique dynamic error correction function built in the servo, can ensure that severe acceleration and deceleration do not run out. The successful application of this system scheme has effectively promoted the performance improvement of sometimes domestic circular printing machines

key words: synchronous control phase adjustment flower electronic cam deviation correction DeviceNet canopen

I. Introduction to circular printing machine

1 Principle of circular printing machine

circular printing machine is a special processing equipment that uses circular nickel to continuously print various colors of patterns on white grey cloth. Its working principle is similar to that of chromatic printing machine. Circular printing machine is a kind of screen printing. As shown in Figure 1

circular printing machines can be divided into: vertical, should not exceed ± 1% according to the circular arrangement There are three kinds of horizontal and radial printing machines, among which the horizontal circular printing machine is the most commonly used. The round printing machine is used in combination with other equipment. Generally, the printing speed is 30 ~ 80m/min. It is widely used in the printing of cotton fabrics, chemical fibers and their blends, as well as general knitted fabrics and silk fabrics

Figure 1 round printing machine appearance

2 Specification parameters of printing Garden:

printing circles are obtained by photographing on nickel coated with photosensitive adhesive. As shown in Figure 2

circumference (d):640mm, 726mm, 820mm, 914mm, 1018mm

working range (W): 1280mm, 1620mm, 1850mm, 2400mm, 2800mm, 3200mm

chromatic number: 6, 12, 16, 20, 24

print type: woven or knitted pure cotton, chemical fiber, i.e. its blended cloth, non-woven cloth, terry cloth, flocking cloth, silk

speed: 5 ~ 100 m/min

printing accuracy: 0.1mm

Figure 2 circular outline drawing

3 Main device functions of the circular printing machine

⑴ cloth feeding device: ensure that the fabric is introduced from the cloth roll or box to the accurate position of the guide belt without wrinkles according to the required speed and tension

⑵ printing guide belt: its function is to guide the fabric forward

⑶ flower aligning device: the flower aligning device can quickly form a complete pattern pattern of all circles installed on the seat, including the following three adjustment systems:

longitudinal adjustment: in the printing process, the circle is adjusted longitudinally through the differential of the circular drive motor

horizontal adjustment: a flower motor drives the reducer to make horizontal adjustment by dragging the frame through the eccentric block

oblique and diagonal adjustment: another flower motor drives the reducer to drag the frame through the eccentric block for oblique adjustment

⑷ cylindrical nickel: short for round, which is made of nickel glued on the bulkhead. It is the main component of printing. The round is transferred to the fabric by scraper. However, many foam granulator enterprises do not pay attention to environmental protection in their production experience

(5) drying room device: mainly used for drying printed fabrics

⑥ cloth dropping device: send the dried fabric out of the drying part with proper tension at the correct speed and into the cloth box

4. Equipment process flow

the main work flow of the circular printing machine is shown in Figure 3

Figure 3 process flow of circular equipment

II. Design principle of control system

the system includes 12 servos, 9 frequency converters and 25 HMI. In order to facilitate system control and maintenance, each color system uses a separate PLC to control i/o points. Since each color system has one input and five outputs, dvp-14ss PLC is selected, and 12 color sub PLCs communicate with the master PLC through delta fieldbus DeviceNet. Because the system has many i/o points and adopts network control, the main control PLC adopts dvp32eh-l, and the control of circular servo adopts CANopen industrial control network to realize data transmission with the main control PLC. The guide belt is controlled by the master PLC through analog quantity to complete the progress, drying room and cloth delivery. The motor is controlled synchronously with the spindle by the synchronous controller. The main control human-machine interface adopts a series of 10.4in super large screen touch panel with colorful and rich functions. It communicates with the main control PLC through RS485 to realize data acquisition and exchange

circle adopts A2 series motion control servo with network type, high resolution and high response to independently control each color circle. Since the process requires 12 circles to be synchronized with the spindle, the system adopts A2 servo built-in electronic cam function and pulse by-pass function to realize synchronous control with the spindle. That is, the spindle encoder directly inputs 12 servos to realize the synchronization of all circles with the spindle guide belt

III. delta system application solution

1 Delta system control architecture

this system is mainly composed of delta B series high-end HMI, network PLC, frequency converter and intelligent motion control servo A2. Its system architecture is shown in Figure 4

Figure 4 control architecture of delta circle system

2 Circular servo architecture

the host part of the circular printing machine is the core process of the whole machine, and the process difficulty lies in the synchronous control of the 12 axis circle. Based on Delta asda-a2 Series High-Performance servo driver, the circular host control system can realize the synchronous control of the circle by virtue of its built-in electronic cam function and powerful pulse by-pass function. The motion control program is completed by A2 servo alone, and the CANopen network communication is used between the servo and the upper controller to realize logic control. The control architecture is shown in Figure 5

Figure 5 circle control architecture

design of dot motion pattern matching

circle pattern matching: that is, under the condition of machine operation, the printing position is adjusted and compensated, and this adjustment can only be realized by adjusting the circle. If the flower position is ahead, it needs to decelerate circularly and superimpose negative deviation pulses; If the flower position lags behind, it is necessary to accelerate the circle and superimpose the positive deviation pulse. The process difficulty lies in the speed and position of each superposition, because the thickness of the circular wall is only 0.2mm. If the speed or position of each superposition is too large or too small, there may be "twist" or "break", and these two phenomena are not allowed

pairs of flowers are divided into coarse pairs of flowers and fine pairs of flowers, and coarse pairs of flowers include inching pairs of flowers and continuous coarse pairs of flowers. Jog alignment is mainly carried out by cam +pr overlapping mode, and each time the leading or lagging guide band is 0.3mm; As the printing accuracy required by the customer is 0.1mm, the fine pair of flowers will lead or lag the guide belt by 0.1mm each time, and the pair of flowers will be completed manually by the operator. Using the servo event trigger PR program, the servo PR planning is shown in Figure 6

Figure 6 servo PR planning

i picture program design

the main control HMI is mainly used for data acquisition, equipment data and status display, and machine control button operation. In addition to planning the basic machine control function, the round HMI adds the specification memory and call function in the system through the man-machine formula function. This function can remember the necessary information such as the number of chromatic sets of historical specifications, the magnetic force size of various colored circles, the size of circles, the diameter of magnetic rods, etc. when users make the same specifications next, they can easily complete the relevant settings by calling. This function is applied for the first time in domestic circular system. In order to reduce the burden of PLC, the calculation of specification parameters is completed by HMI macro instructions. (Figure 7)

Figure 7 HMI screen program design

C program design

⑴ network configuration

for the configuration of DeviceNet and canopenbuilder, delta provides humanized software devicenetbuilder (Figure 8), which can be used to complete the address mapping and configuration of the whole network simply and quickly

figure 8 devicenetbuilder interface diagram

⑵ single acting program design

the process requires that the selected circle can still keep its original phase running at the speed of 3m/min when the guide belt is stopped, that is, when the main encoder has no pulse sent out, so here we use CANopen network to control P to trigger pr#5 to run in speed mode, so as to achieve synchronous control

start: write p=k5, that is, trigger PR 5

stop: write p=k6, that is, trigger PR 6

Figure 10 circle action program

IV. advantages of delta circle overall solution

1 The whole control system adopts can industrial control bus, which has the characteristics of saving wiring, reducing cost, improving performance and convenient maintenance

2. The circle adopts high-performance motion control servo, and the whole printing action servo is processed separately; 1kHz response bandwidth, unique dynamic error correction, to ensure that there is no runaway in the acceleration and deceleration process

3. After on-site testing, delta control system can be realized that the branch is actively designing a complete system, with a speed of 80 ~ 100m/min and a printing accuracy of ≤ 0.1mm

The successful application of the complete integrated system solution of delta round printing machine shows that Delta has a deeper understanding of the technological process of machinery in this industry, and can provide low-cost, high-performance and optimized system solutions for more customers in the printing and dyeing industry. (end)

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