What concrete pump truck arm vibration problem?

The problem is the current hot issues of practical application in the industry. Boom system as one of the core structure of concrete pump truck, truck boom in the construction process because the flow of concrete subjected to impact, it will inevitably have varying degrees of rock, concrete pump truck boom in extreme conditions end shaking can reach 1-2m, seriously affecting the fabric of concrete pump accuracy and construction safety.

Concrete Pump Truck company so active vibration control project team since 2009, began to conduct continuous damping control technology research, the project team from the beginning to the coupling mechanism of concrete pump truck boom to start the flow of concrete pump truck boom stimulated vibration principle depth analysis through multiple degrees of freedom arm gesture, multiphase flow reaction force of the impact study and the boom end vibration test, to identify the main factors affecting the concrete pump truck boom vibrations, for the latter were Active damping control of the foundation.

Among the many factors, the project team found that the root cause of pulsation pumping boom truck shaking. Concrete pressure pulsation inevitably causes vibration of the boom system. When the pump work, structural vibration boom and concrete delivery tube interaction, is a typical solid coupling dynamics pipes conveying fluid flow problems. Although the concrete in the pipe flow rate is small, but because of its high density and flexible multi-joint arm structure, coupling between the concrete and the boom can not be overlooked. To this end, the project team for pumping arm vibration - boom coupling system has been fully tested experimental research, the successful development of adaptive frequency vibration control technology. By pumping system error frequency control eliminates resonance boom, boom due to resonance to suppress excessive vibration problem caused significant effect.

For more general reaction force due to flow pulsations lead to concrete boom sloshing problems, the project team continued to Zoomlion concrete pump truck boom vibration characteristics of the mainstream models under typical attitude were studied and analyzed, to find out the different meter section of regular truck boom vibration. They tested by actual site for the actual construction conditions on critical control parameters adaptive control, the realization of concrete pump truck boom conditions become more active vibration control attitude, typical operating conditions can be damping the boom 50% the above. The team also aid eliminate drift control process control technology boom zero drift, greatly improving the safety of the construction. Currently, the company truck boom stability has been widely recognized by customers and affirmation.

With the development and progress of the company’s technology, more and more models are equipped with a carbon fiber composite material boom, compared with the previous all-steel boom, boom vibration characteristics of composite carbon fiber is more complex, the boom in the construction process high order vibration obvious, active vibration control to boom brought a new research topic. According to the characteristics of carbon fiber composite material of the boom, the project team in order for a vibration suppression on the basis of its high-end costs have also been there for inhibitory control, to achieve the overall objective of an integrated damping and control technology as a key mounted , has been applied on the 80m, 101m concrete boom pumpand other products to the company’s benchmark for landing the company’s product strategy provides a solid technical support.