Concrete Pump

ConCrete pump Part 1

Components Prepared by: Ahmed gAmAl el-din el-refAei Ali kishtA mAhmoud younis mohAmed Ali

2010

Circuit components

The hydraulic components of the concrete pump Hydraulic Pumps: The hydraulic pumps for the concrete pump circuit are bent axis, variable displacement piston pumps. They are horsepower controlled, which means that as pressure rises towards maximum, the flow can decrease, so the power consumption remains constant.

Main Control Block “Brain”: • Oil from hydraulic pumps enters the “P1” and “P2” ports of the Main Control Block. • S1 spool is in the neutral position • Hydraulic oil will flow through the Main Control Block and go back to the hydraulic tank.

Main Relief Valve: The main relief valve protects the hydraulic circuit, by relieving pressure before it reaches 350 bar or greater.

Differential Cylinders: The term differential cylinder means that each hydraulic cylinder that pushes the concrete has an area difference (referred to as an “area differential”) between the two sides of the piston. This area differential exists because the rod extends only from one side of the piston. This is in contrast to the rock

Material Cylinders: The material cylinders contain rubber rams that are connected to the differential cylinder rods. One side will push the concrete through the Rock valve while the opposite side will suck concrete from the hopper.

MPS Valve: The MPS system consists of three small directional control valves. The main pressure that is supplied to this directional control valve is supplied by the accumulator.

S3/Accumulator Control Block:

Accumulator: The accumulator can be considered an energy storage device for hydraulics, similar to the function of a battery in an electrical circuit. The accumulator stores the oil flow of a small hydraulic pump until it is time to shift the Rock Valve. When needed all of the oil that as been stored in the accumulator is quickly released.

Rock Valve Slewing Cylinder: The rock valve slewing cylinder is a nondifferential cylinder .The switching grooves are used in single-circuit machines, but not in twin-circuit machines.

Boom circuit

Boom Pump: The hydraulic pump for the placing boom is a variable displacement, bent axis, axial piston pump. It feeds all of the following components: • The hydraulic cylinders on the boom sections • The hydraulic cylinders on the outriggers • The hydraulic motor for the boom slewing gear • The hydraulic motor for the water pump • The hydraulic motor of the compressor (optional equipment)

Boom Holding Valves: Two hydraulically unlockable check valves (H.E.R. valves or holding valves) on each boom cylinder prevent the boom from coming down unintentionally

Hopper

Outrigger

Vector The Vector control system is a completely digital control system, which means that the function movements are converted to numbers (0’s and 1’s). The numbers are sent to the controller where they are analyzed, converted back to analog (voltage or current), and sent to the valves and indication devices.

Types of control in the vector: Local control Radio-control transmitter & Receiver Cable control box connecting cable drum

thAnks this is done by eng/ Ahmed gAmAl el-din el-refAei Al kishtA eng/mAhmoud younis mohAmed Ali

Mechanical power engineering department Faculty of engineering Mansoura University Egypt

Thank you all Good bye