Telescopic boom frame system and concrete spraying trolley

Abstract

The invention discloses a telescopic boom system and a concrete spraying trolley. The telescopic boom system comprises a telescopic boom (3) and multiple stages of boom frames, wherein the telescopic boom is connected to the last-stage boom frame (4), a telescopic accommodating cavity (5) in a cylindrical hole shape is formed in the last-stage boom frame, a cylindrical cylinder barrel part is formed at the end part of the telescopic boom (3) and is accommodated in the telescopic accommodating cavity in a telescopically movable manner, a piston (7) and a piston rod (8) are arranged in a barrel cavity (6), one end of the piston rod is connected with the piston, the other end extends into the telescopic accommodating cavity and is connected with the last-stage boom frame, and a rodless cavity oil port (A) and a rod cavity oil port (B) are further formed in the piston rod. The telescopic boom adopts cylindrical arm frames with high processing precision instead of a general box-shaped arm or other polygon arm frames, so that structural deformation caused by welding and the like is avoided, the stability during work is high, and the overall performance is better. Further, an annular gap between the arm frames is small, entering of a springback concrete material can be prevented effectively during construction, and jamming is avoided.

Description

technical field [0001] The invention relates to the field of concrete engineering machinery, in particular to a concrete spraying trolley and a telescopic boom system thereof. Background technique [0002] Concrete spraying trolley is a commonly used concrete spraying equipment for support construction in railway tunnels, highway tunnels, hydropower tunnels, underground powerhouses, subway engineering, rock engineering, underground engineering and other fields. Among them, the top manipulator part is an important working part of the concrete spraying trolley. The top manipulator part presents a dynamic process in actual work, requiring multiple compound actions such as stretching, pitching, turning, nozzle swinging, turning, and nozzle swinging. Realize flexible operation and be able to spray concrete timely and accurately. Therefore, the nozzle assembly installed on the top manipulator part also has different postures in various compound actions, and the working load is in...

AI Technical Summary

Problems solved by technology

The box-shaped telescopic boom 3 and the bottom boom 4 need to be welded by the upper and lower cover plates and the left and right webs. The welding structure inevitably has uncertain welding thermal deformation, resulting in the box-shaped cross-section of the telescopic boom. The shape of the telescopic arm will be deformed, and the deformed box-section shape has a certain impact on the working performance and telescopic reliability of the telescopic arm, thus affecting the performance of the equipment

Although the welding operation of the box arm is simple, there are many welds, and the spread of welding cracks will affect the load distribution. In severe cases, weld cracks or even broken arms will occur

Moreover, due to welding deformation and reduction of telescopic friction, there is a large gap between the telescopic boom 3 and the end boom 4, ranging from 1 to 2mm to 10mm, and the concrete spraying trolley often works in a dusty environment. In the harsh working environment where there is a large amount of rebound concrete material, the gap is exposed and the rebound concrete material is easy to enter the gap between the telescopic boom 3 and the bottom boom 4, resulting in stagnation, which seriously affects the working performance of the telescopic boom 3

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