Question

Answer the following: (Each Question carries 5 marks) 1. Design a Hydraulic circuit and electrohydraulic circuit for the Scissors Platform Lift. 2. Explain the concept of controlling electrical circuit remotely. 3. Critically explain the working of the crane with respect to the hydraulic circuit drawn. Main boom M Load Booming cylinder Counterbalance valve MB MX Main valve - Reducing valve w Pressure relief valve MA AI Joystick BI K2 T Directional control valve KI Main pump Make-up Check pump valve Rubrics Rubrics for descriptive questions: 5 marks: complete correct answer. 4 marks: correct answer with minor mistakes. 3 marks: partially correct answer O marks: incorrect answer. Rubrics for circuit questions: 5 marks: complete correct answer. 4 marks: correct answer with minor mistakes. 3 marks: partially correct answer Omarks: incorrect answer.

Answer 1

(P4 -cylinder Salm) 17 piston Managneter Hydraullic accomolatos Luar -Reduce value ↑ Premare contre value T Filter Manometert electric motor LO Purple rank turor back valve Hydraullic circuit for the scissor platform lift FUSE DISCONNECT Black 115V 47 50H2 L2 Groured white 2 14 AWG Ground FUT 15 Amp 3 UP Black Pump motor 1151 1208 Amp ho Texsonimal If Green Doon FU2 awhite O Down 2 Amp foot pesal or Hand pedant Echo hydraulic circuit for the scissos platform solenoid around

used which actuates the reday 27 The concept of controlling a circuit imvolues use a ani coocontroller transistor and by remotely relays are ofter alongside Here, NPN transistors are used and AC vo is provided to the circuit. voltage Hence the working is like when a command is given to the microme microcontroller to turm on the load, the pim of the microcontroller is set upto some voltage toons onto the NPN transistor. When the transistor is ON current flows from collector to emitter of the transistor and relay comects the AC voltage to the circuit breaker which turns on the circuit breaker. So, hence it works. 87 The working of the crane with respect to hydraullie Girait drawn. So here the coane mounted hydraullic circuit uses a load control valve. The main system Gormponents are main pump supply pressure, lift oil, the joy rod to give oil to the driving precouse, the control value to control the direction of load, and the speed corotool hydraulic cylinder The control valve is fitted directly the make-up and test value to maintain a certain minimum press of the cylinder chamber as shown in the control valve is the combination of driver thouttele jalue to control the speed when lowering the load, the oil check valves. to pass when the load and pressure, relief valve that only when high pressure rises. opens to the the figo lifting

When um loading, the joystick delivers popestre Dond echt ky - steering wheel and x-value to the As a result the flow channel from A to B of the vertical value opens and main valve partially opens the drived, pressure, allowing Chamber oil to rices from B to A and eventually the non-stick back. Therefore the load is reduced speed is therefore controller by the load control valve equally at the pressure of the driver provided for me installation of the toe.
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