Delta's Electromechanical Products Used in Double Servo Cutting Tables

introduction

The main purpose of the automatic cutting table is to cut the transparent tape, self-adhesive tape, plastic film, paper roll and other materials in a fixed length, and cut the entire width of the material into small rolls through the set width. For example, the commonly used transparent glue is cut through the device. The width of the cut can be set on the human-machine interface. A variety of working modes can be established on the man-machine interface. Each mode includes: setting width and number of cutting knives. For example, if the customer selects mode 1, the system will automatically cut according to the width set by mode 1 after the operation. After the number of cutters reaches the set number of cutters, the system automatically stops. If mode 10 is selected, the system will automatically shut down after cutting off the number of cutters set in mode 10 after startup. The difference between dual servo and single servo is that the movement of single servo control cutting table is driven by servo, and the feed and retraction are controlled by the oil pressure system. The double servo uses not only the movement of the cutting table but also servo feed and retraction. The length of the feed can be set on the man-machine to improve the cutting accuracy.

Automatic cutting stations are divided into single and double tubes. Both Shanghai Electric and Mechanical Equipment Co., Ltd. have already had successful cases, and they have been used stably at the customer's office. The supporting machinery manufacturers are already using Delta's products. Because of the increasingly fierce competition in the industry, in order to further improve the quality of the equipment and meet the higher accuracy requirements, we provide our customers with a dual-server automatic cutting control program. Through two days of development and debugging, the equipment will be successfully developed. This step further consolidated the confidence of customers in using Delta products. At the same time Delta's servo performance has also been recognized by customers.

Electronic control system design
1. System Components The system components are shown in the system block diagram (Figure 1).

Figure 1 System Block Diagram


2. Hardware Configuration of Electronic Control System Based on Delta Technology Platform

name

model

Quantity

manufacturer

touch screen

DOP-A57CSTD

1

Delta

PLC

DVP-32EH00T

1

Delta

PLC

DVP-08HN00T

1

Delta

Inverter

VFD-037B43A

1

Delta

Inverter

VFD-022B43A

1

Delta

AC servo motor controller

ASDA-A0721L

2

Delta

Proximity switch

-

8

Homemade

Switching power supply

DC24V

1

Taiwan Ming Wei

The design of the control system of the double servo automatic cutting table 1. The analysis of the process main body The double servo automatic cutting table is driven by two inverters. One drive spindle motor; the other drives a round knife (cutter). Two servo coaxial shafts are connected with the screw rod, and the positioning of one control cutting table is fixed length. Another control feeds and retracts. The inverter is controlled by means of RS485 communication, given the speed of the spindle and round knife. The servo is positioned in Pt mode. According to the customer's requirements, it provides a single-segment and continuous two control modes and 10 operating modes. If you have special needs, you can extend the operating mode to dozens of modes. Each operating mode includes two parameters: width setting and knife setting.

2. Process control design According to the production requirements, the width of the tape to be produced and the number of the knife to be cut in the width are pre-set in the parameter table. These two parameters are related to the power-off retention register in the PLC. If the operator selects the single-segment control mode, after entering the mode number on the man-machine, the system automatically calls out the parameters (width and number of knives) corresponding to the mode. After start-up, the cutting table begins to move horizontally through the servo, and when it reaches the set width, the cutting table moves horizontally to stop, and the longitudinal movement of the cutting table is controlled by another servo. When the cutting table moves to the front limit position, the timing starts, and the tape is completely cut off. Once the timing is reached, it automatically returns to stop at the rear limit switch. If the number of the knife set in this mode is not zero, the above operation is repeated until the number of cuttings is equal to the number of the knife set in this mode, and it is automatically stopped. If the number of knives set in this mode is zero, the system will not operate. If the operator selects the continuous control mode and enters the mode number on the man-machine, the system will automatically cut according to the width and number of cutters set in mode 1 after starting. When the cutting of mode 1 is completed, the width set in the next mode is automatically set. Knife number cutting, if the set number of the knife in this mode is zero, the system will automatically skip this mode and execute the next mode until it stops after the set mode is all cut. For example: In the continuous mode: Select mode 10, after the start the system cuts according to the parameter set in mode 1, the mode 1 cutting is completed, if the number of the knife set in mode 2 is not zero, then the width set according to mode 2 and The number of cutters is automatically cut; if the number of cutters set in mode 2 is zero, the system automatically skips mode 2 and cuts according to the parameters set in mode 3. And so on, until the width and number of cutters set in mode 10 have been cut, the system will automatically stop. The horizontal movement speed of the cutting table can be set on the man-machine. The speed of lateral movement is divided into two stages: the initial velocity of the movement and the normal operating speed. The switching of the two speeds is accomplished by timing. The time for two-stage speed switching is set on the man-machine. Before the normal production, the system must perform counter-setting to ensure that the round knife can cut off the material that needs to be cut, and at the same time, it is required to rapidly feed/retract the knife. When the round knife is about to contact the material, the round knife cuts at full speed. After cutting, quickly retract. In this request, I designed a very user-friendly operation for the customer. Before starting, set the feed speed and cutting speed on the man-machine and then manually feed. When the manual feed starts, the feed speed is faster, manual feed is sent, and the round knife quickly returns. At this point, the system automatically memorizes the manual feed operation time and displays the time on the human machine. When the system is in normal operation, the round knife quickly approaches the material to be cut at the set feed speed every time it is cut, and the time that it automatically memorizes before running the knife is slower at the set cutting speed. Speed ​​cutting. Simple and convenient operation, more humane.

3. The sequence of the process control flow of the process control system is as follows: First, the chuck action, before the chuck action, the rocker cylinder must first move upwards, and after reaching the limit, the chuck and the ejector act, and the spindle is tightened and clamped. live. Then the spindle and round knife can start cutting. If you press all stop during the automatic operation, the spindle and the circular knife stop running, then the ejector pin is returned, the chuck is sent open, and after the ejector retreats, the rocker arm cylinder goes down and stops when it reaches the limit. After continuous operation, the system automatically stops, and the ejector pin is automatically returned and the chuck is released. Rocker cylinder down into place. Then, when changing the roll again, if the chuck is started, the cutting table is automatically reset to the origin, and the rocker arm is upwardly in place, the ejector pin is in place, and the chuck clamps the spindle, which facilitates cutting of the entire roll of tape and is convenient for roll change. Use the personnel's operation.

4. Automatic memory function In the process of automatic cutting, if there is any fault or the operator manually stops, the system records the currently executed mode number and has completed several cuttings. If the fault is re-started after processing is complete, then Follow the pattern before stopping to continue cutting. The above is the automatic cutting state.

5. The automatic tool setting function provides the function of automatic tool setting in the manual mode. That is, in the event of a fault or the quality of the previous cutting is not high, in the stopped state, you can press the indirect homing or indirect advance button on the man-machine or operation panel to cut the width automatically set in the current mode backwards or Move one width forward to achieve automatic tool setting. It also provides manual tool setting.

6. Key technical design
1 Mode parameter setting and recall

Use the data of the continuous power-failure holding area in the PLC to memorize all the mode parameters (width setting and tool number setting), and the corresponding address in the PLC is double word. If the width setting in Mode 1 corresponds to D500 in the PLC, then the number of tools is set to correspond to D502 in the PLC. In Mode 2, the corresponding addresses of the two parameters in the PLC are D504 and D506. So you can use indexing to address. The input of the mode number corresponds to D570, and the function of calling the parameter can be realized through the following procedure.

SUB D570 K1 D90
MUL D90 K4 D92
MOV D92 F2
ADD D92 K2 D160
MOV D160 F1
DMOV D500F2 D192 //Set width
MOV D500F1 D190 //Set the number of knives

2 length calculation

The lead of the screw is 10mm, the electronic gear ratio is 2 and the servo is every 10000 pulses/turn. The servo and the screw are coaxially connected. Width set 2 decimal places. Therefore, the relationship between the set width and the required transmission pulse can be derived as follows:
Required pulse = 10000 * set width / 100 * electronic gear ratio * lead = set width * 5

3 mode conversion

The current number of cutters is based on the retraction position, plus one at a time. When the number of cutters is equal to the set number of cutters, the mode is automatically increased by one. This automatically converts the operating parameters to the parameters set in the next mode.

4 Communication

The speed of the spindle and the speed of the round knife are communicated via RS-485, and the inverter is given by the PLC.


system debugging

1. System debugging
1 Complete the entire logic of the control through debugging. Ensure that the basic logic action is correct.
2 Successfully debug the communication program of the frequency part of the spindle and the circular knife.
3 In manual mode, the servo is operated in JOG mode.
4 Servo parameter setting: 1-00:2;1-01:0;1-44:2;2-08:12;2-10:1;2-15:0;2-16:0;2- 17:0; Adjust 2-00; 2-02; 2-04; 2-25; 2-26 according to the specific operation effect of the servo; adjust the 1-08 parameter accordingly to ensure that the servo is flat during operation. Set this parameter according to the specific situation.
5 Judging the direction of servo operation, consistent with the requirements.
6 Connect the grounding on the servo drive as required. At the same time, connect the grounding wire on the inverter to the reliable ground. Otherwise, the servo may malfunction due to the interference caused by the inverter operation. If there is no reliable ground on site, reduce the carrier frequency of the inverter accordingly. If there is a 24V power supply in the cabinet, you may consider connecting the inverter's ground wire to the 24V- switching power supply to reduce interference.

2. Whole picture

Conclusion
Zhongda Dentsu is mainly the automation market equipment and service provider with the most growth potential in China. Delta's inverters, encoders, human-machine interfaces, PLCs, servos, thermostats and other electromechanical products and technical services cover major automation technology areas. The parent company of Delta Electronics is the world-famous electronics manufacturing multinational company, Delta Electronics Group. Delta Group has a large-scale production base in Wujiang, Jiangsu Province, providing comprehensive manufacturing of electromechanical products. Zhongda Dentsu's service system is spread all over the country. Delta is also the world's largest supplier of power management systems. As a well-known manufacturer in the industrial control industry, through the application of its own products, it can provide comprehensive solutions for customers in all walks of life. The best product cost-effective, thoughtful and comprehensive nationwide and even global warranty service can guarantee the interests of customers.