Working principle of radio control grab

working principle description

Grab Closing: When grab opens, the transverse frame is connected with the grab head but totally separated with the through beam. Solenoid directional valve is closed at this moment. The piston rod of the cylinder is connected with the transverse frame, and the cylinder barrels are firmly jointed with the through beam, so the piston rod of the cylinder is fully extended at this moment. When the grab is loading the bulk materials, steel wire rope of the crane falls and the piston rods draw back for it can move in one-way direction，and then the transverse frame falls. After the piston rods draw back completely, and the transverse frame falls. After that the steel wire rope of the crane rises, and the transverse frame rises with it. As the solenoid valve of the cylinders is always closed, at this moment, the rod cavity & the cylinders are locked. With the pulleys, the transverse frame's rising drives through beam to rise, at the same time, the scoops close.

Grab Opening: When opening the grab, press the button of the remote control to open the solenoid directional valve of the cylinder, which makes the rod cavity offloads. Piston rod of the cylinder is pulled out by the transverse frame and through beam, and the transverse frame is separated from the through beam, so the grab opens.