The structure of the hydraulic sheet metal bending machine is mainly composed of a frame, a foot switch, a bending angle positioning mechanism, a horizontal material positioning mechanism, a pressing and bending mechanism, and an electrical control system.

The bending angle positioning mechanism is composed of a servo motor and a chain transmission mechanism. The bending angle can be set for fine adjustment or automatic height adjustment to ensure the height positioning accuracy. The horizontal material blocking mechanism is composed of a servo motor and a screw drive mechanism, and performs positioning of the width of the bending workpiece. It can be fine-tuned positioning or automatic positioning, automatic selection of multiple working steps can be carried out in continuous bending, and positioning and bending of multiple positions can be realized in turn. Pressing and bending is carried out by a hydraulic mechanism, and can be operated in three modes of jog, single and continuous with the foot switch.

　　(The picture comes from the network)

Working principle

The working process of the bending machine can be divided into three working modes: jog, single and continuous.

Jog:Select the jog operation gear, step on the foot and move forward slowly, press down the bending mechanism automatically press down, touch down the travel switch to stop pressing down. During the pressing process, loose foot and slow forward to stop the current running position. During the pressing process, the foot pedal is returned, and the bending mechanism is automatically returned, and the stroke is encountered to stop the return. During the return process, release the foot return and stop the current return position.

single:Set the pressure holding time, pressure relief time, horizontal blocking material advance and retreat distance, adjust the horizontal blocking material position. Select a single operation gear, press down the upper stroke switch position of the bending mechanism, and first automatically return to the upper stroke switch position. Stepping on the foot and moving forward slowly, the pressing and bending mechanism automatically presses down. When the stroke switch is touched, the horizontal stopper mechanism moves backward to set the distance, and at the same time, the pressure is automatically maintained. The pressure relief time will automatically release the pressure, the pressure relief time will automatically return to the downward bending mechanism, and the horizontal blocking mechanism will automatically advance to set the distance. When the travel switch is touched, the single bending action ends.

Continuous (working step):

(1) Set the pressure holding time, pressure relief time, the distance between the horizontal block material advance and retreat, and adjust the horizontal block material position.

(2) Set the number of working steps, the stop position of each working step, and the number of bending sheets.

(3) Select the continuous operation gear, the press-bending mechanism does not go up the stroke switch position, first automatically returns to the up stroke switch position. Stepping on the foot and moving forward slowly, the pressing and bending mechanism automatically presses down. When the stroke switch is touched down, the horizontal stopper mechanism moves backward to set the distance, and the pressure is automatically maintained at the same time; when the pressure retention time expires, the pressure is automatically released, and when the pressure relief time is reached, the bending mechanism automatically returns, and the horizontal stopper mechanism automatically advances. Fixed distance. When the travel switch is touched, one bending operation ends and the next bending is performed.

(4) The current working step bending times are completed. When the stroke switch is touched, the horizontal stop position is automatically adjusted to enter the next working step bending action.

(5) When all the steps are completed, the stroke switch is touched, and the continuous bending action ends.

Program flow chart

system structure

This system uses the CPU201-2401 of NA200 PLC series to control. The CPU201-2401 body integrates 14 channels of 24VDC input and 10 channels of transistor output. The output has 2 common terminals, the output channel is powered by a 24VDC drive power supply, and has two high-speed outputs, which can be used as PWM (100KHz) or PTO (100KHz). In addition, you can also use the RS-232 communication port to communicate with the touch screen.

System I/O allocation table:

The equipment uses a highly cost-effective NA200 PLC to provide an overall solution, replacing the original single-chip control system, avoiding interference and unstable factors, and ensuring better control of equipment operation. The equipment has high requirements for the angle adjustment and the positioning accuracy of the stopper. The servo motor is used for angle adjustment and automatic positioning control of the stopper. The positioning is accurate and can meet the requirements of complex processes.