The hydraulic system of the rolling machine can automatically realize overload protection. The hydraulic overload protection system is composed of pneumatic pump, unloading valve, pressure relay, solenoid valve and pressure gauge.
When the hydraulic system of the coiling machine fails, the pressure in the hydraulic cylinder of the coiling machine rises sharply. The high pressure of the unloading valve is greater than the back pressure of the back pressure chamber, pushing the piston down to open the oil return port, and the hydraulic oil is quickly leaked back to the oil tank. Under the action of the balancer, the slider moves up to protect the press and the mold from damage; at the same time, the pressure appliance and the stroke switch act, the clutch control line is cut off, the press stops; the solenoid valve closes the air source and quickly discharges the unloading The valve back pressure chamber air, the "normal" indicator of the coiling machine is off, the "unloading" indicator is on, and the press cannot be started.
The overload protection function of the hydraulic system of the coiler protects the coiler and reduces the frequent occurrence of faults.
