Introduction

Introduction
Introduction - Concrete Pumps

WHAT IS A CONCRETE PUMP?

 
A concrete pump is a tool used for transferring freshly mixed liquid concrete to the location on a construction site where it is needed.
It works using a valve system and the basic principles of hydraulics.
 
When concrete is required, a mixing truck first mixes concrete within its rotating drum.
Then the truck pours its liquid concrete into a hopper, which continues to churn the concrete so it will not solidify.
From there, the concrete pump sucks the liquid concrete out of the hopper, through a valve system, and into the area where it needs to be laid down, sometimes with the use of auxiliary hoses.
 

BOOM PUMPS (TRUCK MOUNTED PUMPS)

A boom pump extends through the air to pump the concrete where it needs to go.
It has a long, flexible, remote-controlled arm made up of articulated sections, and the arm extends into the air much like a crane.
Boom pumps and can be used for hard-to-reach areas that a line pump cannot reach, such as the upper floors of a high-rise or apartment complex.
When the boom is not in use, it folds up into neat segments on the back of the truck for transport.
The articulated sections of boom pumps come in a few different folding configurations:
Roll-and-fold: The sections of roll-and-fold pumps fold one under the next in a curling motion. They are ideal for wide-open spaces because they need plenty of room to unfold.
Z and ZZ: The sections of these pumps fold back and forth like an accordion. They are ideal for fitting through tight spaces and over and under obstructions, such as over a house and then under tree branches
RZ: These pumps, also called multifold pumps, have sections are a combination of roll-and-fold and Z sections.
 

HOW CONCRETE PUMPS WORK

The operation of the concrete pump involves the use of hydraulic and electrical systems.
This system incorporates material cylinders linked to hydraulic cylinders that cycle alternately.
With concrete mix in the hopper and the pump operating, a material cylinder retracts, drawing material into the cylinder.
At full retraction of the cylinder, a signal is sent to both the S-tube swing cylinder and the drive cylinder directional valves causing
the S-tube to shift position to the fully loaded material cylinder and the drive cylinders to change direction.
The concrete piston of the loaded cylinder then pushes the material through the S-tube and into the delivery lines.
 
The shifting from one cylinder to the other cylinder takes place providing a continuous flow of concrete mix through the pump trucks concrete piping system.
The pump can be operated at the control panel or can be operated from the remote control.
The hydraulic oil flow created by the hydraulic pump pushes the drive cylinder pistons inside the drive cylinders alternately back and forth.
Because the drive cylinders and concrete pistons inside the concrete cylinders are linked together, the pistons move synchronously.
When a drive cylinder retracts along with the concrete piston, concrete will be sucked from the hopper into the concrete cylinder.
Simultaneously, the other drive cylinder and concrete piston are extended toward the hopper.
The concrete piston will push concrete from the concrete cylinders through the S-Tube and out to the concrete pipe and concrete hoses.
 
Next, the pump switches at the end of the stroke, causing the s-tube valve to shift to the other concrete cylinder which has sucked and filled the cylinder with concrete, starting the next cycle.
Reverse pumping links the concrete piston in the suction stroke and S-Tube valve to suck concrete from the s-tube instead of the hopper.
As a result, the concrete piston pumps concrete back into the hopper. Reverse pumping is mostly used to clean out the concrete hoses after the pour is done.
 
The power for operation of the concrete pump is provided by the engine, which drives the hydraulic pumps.
All functions for operation of the concrete pump can be accomplished from the local controls mounted on the side of the pump truck.
Optional hand-held cable or radio remote controls enable the pumping process to be operated from a remote distance.
The concrete pump is designed to safely pump wet concrete through a delivery system of pipes and hoses within its published ratings and specifications.
 
Safety and Stability of the concrete pump during operation is provided by the front and back outriggers. Controls for the outriggers are located on the sides of the concrete pump truck.
 

Features of Hydraulic Concrete Pump

 
1.High-efficiency material suction system. When the concrete pumping machine starts to work, the machine can pump effectively.
2.Good lubrication and energy saving. The lubrication system adopts the automatic centralized oil-supply system, and it has the features of sufficient oil-supply and good lubrication.
Moreover, the system has the prominent advantage of energy saving. Compared with the continuous oiling, the oil consumption will decrease to 50%.
3.Reasonable design. The match of dynamical system, hydraulic system and pumping system enables the motor to deliver the maximum power.
4.Unique buffering technique. The distribution circuit adopts the special buffering technique, which guarantees that S-valve wings to the right position. The elaborated design prolongs the working life of S-valve.
5.Wearable resistant. The concrete mixer hydraulic pump adopts the new type of wearable materials and advanced weld technique. So that the components used frequently will have long service life.
6.Optimal configuration. The concrete mixer truck hydraulic pump adopts the original imported hydraulic components and electrical elements. So that the equipment has reliable performance.
 

Parts of Truck-mounted concrete pump