1. Overview
1) About concrete pump concrete pump is a very common construction site engineering equipment, mainly to complete the delivery of cement mortar to the high buildings, because the concrete pump s high efficiency and convenient mobility function, is a large number of construction sites, the market demand is very great.
2) concrete pump truck concrete pump control system for the early use of conventional relay logic control circuits, circuit more complex and difficult to maintain, is on the control of conventional concrete pump to re-design, the control center using Schneider Electric Twido series PLC in TWDLMDA20DTK, this model of PLC s CPU, integrated input and 12 output points, 8 internal programmable resources are very rich, and it s installed size is small (35.4X90X70mm), can reduce the power Control cabinet size. Schneider Electric Twido used as the core of concrete pump control, the system of control more powerful and flexible, and easier to maintain equipment.
2. System Description
concrete pump control core is TWDLMDA20DTK, it was completed for the main motor of the star - delta starter switch, automatic pump / pumping operation to move the wired remote control and operation control, the use of electrical lines A self-locking double button contacts button wired remote control box and control box buttons 5 buttons multiplexing operation to save PLC input point, reducing equipment costs.
System function as follows:
main motor does not start in place before, in addition to the main motor start button operable, the other key functions in the PLC internal to lock, main motor starts in place, the main motor-ready indicator lights, indicating the operator can be the next step, the same time, lift the other operations in the PLC program the lock button.
press the automatic is the pump / anti-pump start button, pump indicator lights, master cylinder piston A / B and the distribution of the main valve 4-cylinder under the piston rod position sensor signals corresponding action cycle of the output, until the press is automatic pump / anti-pump stop button.
wired remote control box in the remote / local operation button to switch to the remote location, the hand-held pump operation is completed box, anti-pump, pump stops and the allocation of functions to move the valve.
3. Conclusion
because after the failure of construction equipment has great impact on the progress of works, concrete pump users are very concerned about the operation of equipment reliability. The Twido PLC high-speed computing power and compact size just totally complex requirements of mobile equipment, other, Twido PLC passed the CE, UL and TUV certification, ensures reliable quality, can be used in a number of occasions, the environment is harsher. Therefore, buy used Twido PLC control concrete pump truck customers, in the course of this type of concrete pump truck s reliability and maintenance given high marks.