You need to understand the importance of concrete pump truck flaw detection

You need to understand the importance of concrete pump truck inspection:

Concrete pump truck boom, legs and underframe support and other structural parts, due to the variable load during the operation, after a period of time, it is likely to be due to the concentration of local stress, oxidation corrosion and fatigue of local structural parts, crack phenomenon. Users in the pump truck every 300 hours after the work, the boom and other structural parts must do weld inspection.

Testing is the use of ultrasound can penetrate into the depths of the metal materials, and consists of a section into another section, on the edge of the interface reflection characteristics of flaws, a method to check the parts when ultrasonic beam from the surface by the probe through the metal parts inside, encountered defects with parts when the bottom reflection wave respectively occurred in the pulse waveform is formed on the screen, According to these pulse waveforms, the location and size of defects can be determined.

In addition to regular flaw detection tests, regular inspection of connecting bolts, set screws, nuts, pins, etc. If loose, tighten with a torque wrench according to the torque provided by the manufacturer. It should be emphasized that the high-strength bolts removed due to structural repair and the connecting bolts damaged due to fatigue should not be reused, and new connecting bolts of the same grade should be used for reassembly. When tightening, the bolts must not be subjected to pre-tension stress, so the boom must be folded and closed and held in a vertical position.

When tightening the bolts on the rotary table one by one, be sure to lock and tighten the nuts. In particular, the bolts of slewing bearing bear huge alternating loads, so after every few hours of operation, the original pre-tightening torque will be lost. The pre-tightening torque of bolts must be checked periodically with a torque wrench. The boom must be placed on the bracket to check the preload torque so as to eliminate the axial force on the slewing support.