Digger Derricks. The all new pilot control system

Transcription

1 Digger Derricks The all new pilot control system

2 Traditional T handle Command Post Controls Large Control Console Allows Customization of a Variety of Optional Features (example Start / Stop) Digger and Winch Controls in Easy Reach Control Station Rotates With the Boom Maintaining Visibility Cushioned Operator Seat with Fore and Aft Adjustment for Optimal Operator Comfort Hinged Console Swings Away for Maintenance Access Digger Shift Control for 2-Speed Digger Auger Stowage Release System Pressure Gauge Boom Controls Located Within Operator Comfort Zone Hydraulic Foot Throttle to Control Chassis Engine RPM

3 Dual Joystick Pilot Operated Control Station Long lasting LED indicator lights inform operator of system enable digger shifted to high digger select radio/top controls on auger release activated 3rd section select. Radio/top controls on/off switch Left Hand System pressure gauge Right Hand *Dig/Win & 2ND/3RD select do not have to be held for continuous operation One emergency stop button for total system shutdown.

4 Hydraulic system T handle style controls Sectional control valve for boom functions Sectional control valve for Digger & Winch Return flow from boom functions HP (Fluid power) Low side travels to mix with high side flow to achieve a total of 40 gallons per minute HP (Fluid power) Low side flow 18 gallons per minute HP (Fluid power) High side flow 22 gallons per minute Unused flow or return flow from a working function is routed back to the reservoir HP (Torque) Hydraulic pump (Power source) Engine (Power source)

5 Cast section valves explained Sectional valves used in T handle command post Tie rods hold the entire valve stack together compressing o-rings and applying a preload to the section spools. This torque is extremely important for free spool travel and o-rings life. This can be a difficult variable to control. Sectional valves use up to four o-rings in between each function and on each end, which are all areas for potential leaks.

6 Transition from cast sectional valves to manifold/cartridge technology From this.. To this Why is this better?

7 Transition from cast sectional valves to manifold/cartridge technology HP (Fluid power) Low side flow 18 gallons per minute HP (Fluid power) High side flow 22 gallons per minute Hydraulic pilot controller Operates on 300psi Advantages: Low (18gpm) and high (28gpm) pump sides combine within manifold. No section seals and no tie rods. Cartridge valves have a spool that is self contained in their own individual housings. They are not affected by outside forces after factory setting and testing. Resistance to oil flow when you are not running a function (i.e. idling with the PTO engaged) wastes energy. Anytime a hydraulic system can be designed to reduce resistance to flow you save heat and horsepower which equals a fuel savings. The new pilot control system reduces flow resistance by 300psi. Unused flow or return flow from a working function is routed back to the reservoir HP (Torque) Hydraulic pump (Power source) Engine (Power source)

8 Boom Hydraulic Overload Protection ( H.O.P. ) System H.O.P. System Protects Digger Derricks by Monitoring Hydraulic Pressures Overloading conditions cause pressure in the base of the lift cylinders beyond normal system pressure. The overloading conditions can be caused by the following: Lifting With The Winch In excess of the digger derrick s hydraulic capacity Extending the Second or Third Boom Section With an excessive load While trying to push / pull a pole that won t move Corkscrewing The Auger Without lowering the boom

9 Boom Hydraulic Overload Protection ( H.O.P. ) System What Happens During an Overload Situation? Excessive load on the boom creates excessive pressures in the base of the lift cylinders. A sensing valve recognizes excess pressure and opens the H.O.P valve. The function causing the overload is halted, as the oil is diverted back to tank. If... digger caused the overload winch caused the overload boom extension caused the overload Then... reverse the digger lower the load with winch line retract the boom

10 Rotation Hydraulic Overload Protection ( H.O.P. ) Protects system from overloading by monitoring hydraulic pressures. What Happens During an Overload Situation? Excessive load on the rotation system compresses oil contained within the worm gear box. Sensing valve recognizes excess pressure and opened H.O.P. valve. Overloaded function is halted while oil is diverted back to tank. When overload condition is eliminated, all functions become operational. If... Then... digger caused the overload reverse the digger winch caused the overload lower the load with winch line Advantages Protects rotation system from damage due to side load Rotation system will continue to hold the load while condition is eliminated Does not allow the rotation system to slip through rotation on a side hill Allows work to resume immediately after overload condition is eliminated. View of boom rotation worm gear with HOP installed

11 Boom Hydraulic Overload Protection ( H.O.P. ) System T handle style HOP system explained Hose from base end of lift cylinder carries pressure readings to overload sensing valve Overload sensing valve Dump cartridge is installed in each function that is protected by HOP. This valve as you see is fairly complex and sensitive to contamination. When activated it dumps full function flow (up to 18gpm) to the tank port in the valve.

12 Boom Hydraulic Overload Protection ( H.O.P. ) System Notice significant reduction in the HOP system components and complication. All results in more reliable system. Hose from base end of lift cylinder carries pressure readings to overload sensing valve Pilot control system style HOP system explained Overload sensing valve Pilot oil from joystick is redirected to tank when a function is to be disabled by HOP. This is really a minute amount of flow, mostly a pressure release. No dump cartridges or complicated valves. To control function

13 Tilt Pole Plummer Holding Valve Simplification These external holding valves are removed to eliminate the potential damage to them while working a pole. Tilt and Claw holding valves located in main manifold in turret.

14 Tilt Pole Plummer Holding Valve Simplification Relief/Junction manifold located in tower. This is eliminated in the Dual pilot system and the Installer simply runs the pressure, return, and drain hoses directly to the hydraulic swivel. This means less congestion in the tower for maintenance and less potential leak points!

15 Competition Dual Joystick Controls Claw open/close Start/Stop Tilt up/down Radio on/off Digger shift No front protection Left Hand Right Hand

16 Competitive Comparison Terex Hydraulic pilot (300psi) control system for all boom functions. Enable, Claw tilt up/down, and Claw open/close are the only electric controlled functions. They are simple 12V on/off circuits, NO CPU. HOP system operates on full hydraulic sensing and dumping. Competition Electronic control system for all unit functions. Utilizes a CPU to be the "brains" of the unit increasing the potential for complicated troubleshooting. HOP system relies on hydraulics sensing but electronic function cut-out. No sectional valves, all manifold and cartridge control valves. Claw tilt up/down, Claw open/close, Digger shift, and Auger release all controlled from joystick handles. Fully reinforced front gate and side rails to protect operator without impeding working views. All joystick controls operate with front/back and side/side motions. All boom functions operate from cast sectional valves. Claw tilt up/down, Claw open/close, Digger shift, and Auger release all controlled from console, you must remove your hands from the control joysticks to operate. No front gate for operator protection. Boom rotation requires a "twisting" of the right joystick which is not an ergonomic motion