Concrete delivery tube and preparation method thereof

Abstract

The invention provides a concrete delivery tube, which has at least two bent parts and comprises an inner tube and an outer tube compounded outside the inner tube, wherein the outer tube at least consists of an outer tube first part and an outer tube second part; the shapes of cross sections of the outer tube first part and the outer tube second tube are circular arcs; the outer tube is formed by connecting the outer tube first part and the outer tube second part; and the wear resistance of the inner tube is higher than that of the outer tube, and the roughness of the outer tube is higher than that of the inner tube. Compared with the prior art, a high-priced surfacing welding process is not required to improve the wear resistance of the inner surface of the delivery tube, and with the composite tube having the inner tube with high wear resistance and the outer tube which is compounded outside the inner tube and has high roughness, the concrete delivery tube meet the requirements on wear resistance and mechanical strength.

Description

technical field [0001] The invention relates to a concrete conveying device, in particular to a concrete conveying pipe and a preparation method thereof. Background technique [0002] The concrete delivery pump truck / trailer pump is the key equipment for the construction of high-rise buildings and other buildings to deliver concrete. The S pipe used on the concrete delivery pump truck / trailer pump is a key component. The S pipe is to have two directions roughly The conveying pipe at the opposite bend, which is roughly S-shaped when viewed from the side, is a concrete conveying component well known to those skilled in the art. As a key component that affects the service life and stability of the pump truck, since the inner surface of the S pipe is in direct contact with the concrete, it is continuously washed by the concrete during the working process, so higher requirements are put forward for the performance of the S pipe. In general, because the inner surface of the S tub...

AI Technical Summary

Problems solved by technology

The deficiencies of the prior art are: (1) the inner surface of the S pipe obtained by surfacing welding is rough, the flow channel resistance is large, and it is easy to cause pipe blockage; (3) The production efficiency of surfacing welding is low and the production cost is high; (4) The controllability of surfacing welding process is poor, the welding operation is difficult to quantify, and it is easy to cause changes in the chemical composition and performance of the surfacing alloy, which is difficult to guarantee The thickness and uniformity of the welding layer; (5) In addition, the parts most prone to wear at both ends of the S pipe may be shortened due to insufficient welding; (6) The pipe wall blank is relatively thick, so the thickness of the surfacing layer is limited, which greatly affects the Service life of S tube

[0005] In the prior art, various preparation methods of composite pipes have been disclosed, such as preparing straight composite pipes by means of interference fit between the inner pipe and the outer pipe, and preparing bent pipes by thermoplastic deformation, but these methods do not Suitable for preparing S pipes for conveying concrete

The main reasons are as follows. Since the S tube has two variable cross-section bends, the inner tube and the outer tube cannot be combined by interference fit.

In addition, it can also be considered to prepare the composite conical tube by interference fit first, and then heat and bend it to obtain the S tube, but the S tube prepared by this method also cannot meet the requirements, because the composite conical tube is bent and formed twice. Inconsistent deformation of the inner and outer tubes, so bends can easily fail

Images