During the packaging process, the packaging speed of each type of screw is different. It is required that the speed control system of the nailing machine provides multiple speeds to deal with it; and it can realize the synchronization requirement with the system through PLC, and requires packaging. The nail feed speed of the machine is variable. For example, a 300pcs/bundle of nails has a feed rate that requires low speed at the beginning of the nailing to form a center of curl; then increases efficiency for high speed feed; ends at low speed for cutting and boxing In order to achieve the above functions, we use Yaskawa's servo motor and expansion module to achieve.
The movement of the general servo motor needs to be given by the host computer with digital or analog signals. To achieve position control, the host computer gives a number of pulse signals. The servo driver determines the distance traveled according to the pulse signal, and the speed control passes the input. The analog voltage is realized in a certain range of speed-voltage correspondence. It can be seen that the servo system itself can only act as an executor of a command, but cannot move spontaneously by itself. However, by using the simple combination of Yaskawa servo and expandable module, it is possible to implement some of the above-mentioned positioning and speed-adjusting movements.
The overall function of the system:
1, different types of nails correspond to different nail feeding speeds, which are selected by the operator on the panel;
2, in the process of packaging for different stages using different nail speed to achieve the above functions, the system made the following connection
System hardware:
â—† Yaskawa SGDH/SGMAH series servo motor â—† Expansion module JUSP-NS600
â—† PLC
â—† Counter
System principle:
1, the number of nails is detected by a counter for use by plc;
2, Plc determines the speed required by the process through the peripheral signals (the type of nails, the number of nails), and outputs the speed selection signal;
3. After receiving the plc signal, the Yaskawa expansion module moves according to the set schedule.
The above steps 1 and 2 are relatively common through plc, and no explanation is given. The following describes in detail how the servo receives the plc signal and converts it to the required speed.
First introduce the functions and principles of Yaskawa's expansion module:
1, the program table running function
It is possible to set the distance that the servo motor needs to move, the speed of movement, the output signal after the end of one action, etc. through a simple table;
There can be 128 steps, you can set different positions and speeds. With the external strobe signal, the corresponding program step can be executed.
The servo motor operates according to a preset schedule value.
2. JOG runs through a fixed external signal to make a fixed speed operation. The running speed is preset by the speedometer. as the picture shows
The speed set in the JSPD column is achieved by the strobe of JOG0-JOG3.
The above two functions indicate that to achieve the speed control function, we can meet the requirements of the system by setting the schedule or setting the speed of the speedometer. However, considering the use of the manufacturer's nail model is more, we have chosen a program table that can correspond to 128 speeds to achieve the above functions.
The program table changes are as follows:
Change the POS to the desired direction of motion and set the SPD field to the speed required for the process. LOOP is set to 1 and NEXT is set to END.
The speed is set separately according to the needs of the processing technology. The speed required for machining can be realized by different PLC output selection. Refer to the following electrical schematic.
START-STOP is the stop start signal, and SEL0-SEL7 is the external input signal terminal (the signal output by plc).
The above is a multi-segment speed control system realized by Yaskawa's servo motor and expansion module JUSP-NS600; the motion control module is also widely used in the following fields (pictured), which can greatly simplify the previous implementation with PLC. Complex programming to improve system reliability and stability
Acid-Base Balance,Calcium Gluconate Injection,Finished Pharmaceutical Product,Acid-Base Balance Agent
NOUVASANT PHARMhealth LTD. , http://www.nouvasant.com