United Equipment Accessories has been busy designing, fabricating, and building two new pieces of assembly and test equipment for our pharmaceutical grade clean room. These pieces of equipment provide the means for the assembly and testing of our hydraulic swivel line. The first is a hydraulic swivel press, which is used to assemble the swivels. The other is a test machine that tests the swivel under low (air) and high (hydraulic) pressures while measuring and documenting any pressure drop and the torque it takes to rotate the swivel. This blog will only address the press.
The press consists of two main areas: 1.) The Frame and 2.) The Air/Oil system.
The frame includes: Lower Spacer Channels, LH and RH Jambs, Header, Press Bed Sub-Frame, Press Bed, Bearing Carriages and Guide Rails. The Press Bed, which includes four bearing carriages, slides on two guide rails and is a part of the Press Bed Sub-Frame, which can be adjusted vertically up or down in 3.00 inch increments. This allows for the assembly of various lengths of swivels. The bed is pulled out so the housing and spool can be placed and then pushed back into position under the ram. The spool and housing are then ready to be assembled.
The Air/Oil System includes: two oil tanks, a hydraulic motor, two manual air valves, an air operated directional control valve, two hydraulic piloted check valves, two flow control valves, and a hydraulic cylinder. The two tanks store the oil for the extension and retraction of the hydraulic cylinder. The cylinder has a 2.50″ bore and 36.00″ stroke.
One of the manual air valves is a two position spring return on/off valve and the other is a three position spring centered on/off valve. Both valves have a lever arm to actuate each valve. The two position valve needs to be actuated before the three position valve, which controls the extension and retraction of the cylinder. These two valves are used to move the rod of the cylinder through free space and force the operator to keep both hands on the lever arms. This prevents the operator from putting either hand into the area of the swivel while extending the cylinder rod.
When extending the cylinder rod, an air actuated directional control valve which is normally open, is closed. This diverts the hydraulic fluid away from the motor directly to the cylinder to extend the cylinder rod through free space.
A hydraulic piloted check valve and flow control are used on both the extend and retract side of the cylinder. When extending the cylinder, fluid from the extend side opens the piloted check valve on the retract side and allows the fluid to pass through the flow control and check valve and then return to the tank. When retracting the cylinder, the fluid from the retract side opens the piloted check valve on the extend side and allows the fluid to return to the tank.
When inserting the spool into the housing, the air actuated directional control valve is open. This allows hydraulic fluid to pass through the motor when the operator turns the hand wheel. For each rotation of the hand wheel the motor dispenses a controlled amount of fluid, which allows the operator to have complete control of the rate at which the spool is inserted into the housing.
Tom Van Veldhuizen
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