Hydraulic system of shearing machine

Hydraulic system

Clean the hydraulic oil

  The hydraulic system has the high requirement for the cleanliness of hydraulic oil. The clean of the oil tank is very important.

  When replacing the hydraulic oil, you must discharge the cover of the oil tank. Use the towel to clean the bottom of the tank(do not use cotton yarn),then wash with cleaning coal oil gasoline. For limitation of tank cover, the arm cannot reach the end of the tank; you can wrap the towel on the bamboo or stick to wipe each corner. Loosen the leaking plug or brake valve to leak out the dirty oil.

  Use the cleaning towel to dry the sides and bottom of the tank until it`s clean. If necessary, roll the dough at the welding seam or difficult cleaning places to cling the dirt, and then put on the cover.

Choose the hydraulic oil

  The mark value of hydraulic oil is equal to the average value of viscosity when the temperature is 40 degree

  If the working pressure and temperature of the hydraulic system are higher and the working speed is slower, the chose hydraulic oil mark is higher.

  It is recommended to use antiwar hydraulic oil ISO VG46#(the average value of viscosity is 46mm2/s when the temperature is 40 degree). if the machine operates under 5 degree for a long period, you can choose hydraulic oil ISO VG32#

  It is also recommended not to use the machine at very low temperatures(below -5 degree).

  However, should this occur, and then let the machine run idle for a while. An oil heater can be fitted in the circuit if required.

  Under the normal working conditions, the oil temperature must not exceed 70 degree. Under special conditions, oil cooler can be fitted necessary.

Fill the oil

  The using oil must clean. Screw the nut of air filter, filling through the air filter. If using the filling equipment with filter, you can open the cover of the oil tank and fill directly. Observe oil gauge, when ram stops at top dead spot, the hydraulic oil fills at 80-90% of inter spaces.

  Make machine work, first idling then at the max. Stroke to expel any air bubbles in the hydraulic circuit.

  The hydraulic system`s working rule as follows:

  The cutting frame goes down:

  When the magnetic discharge valve 3 is electricity working on, the hydraulic oil drew out by pump 2 and flows through magnetic discharge valve3, go into the hold downs and the up-area of main oil cylinder, the piston of hold downs go down to press the meta-plate after against the pull force of the spring, and the oil pressure starts to rise. When the pressure get against the nitrogen gas pressure in stroke cylinder, the cutting frame goes down to cut.

  The cutting frame returns up:

  When up-cut frame goes down at the down-dead spot, magnetic iron YV1 of magnetic discharge valve 3 lost electricity by a limit switch, the cutting frame goes up by the pressure from nitrogen gas cylinder. At the same time oil of up-area in the main cylinder flow back oil tank through the magnetic discharge valve. Also, the piston of hold downs goes up by the pull force of the spring and oil return back to oil tank through magnetic discharge valve 3. when the cutting frame come at the up-dead spot, one cutting is finished.

Standard control equipment