Application of plasma surfacing technology in the field of construction machinery

       Construction machinery is a general term for all kinds of construction machinery used in engineering construction, which are widely used in construction, electric power, water conservancy, roads, mines, ports, municipal and national defense and other engineering fields. The construction machinery has a large quantity and a wide range, and the use of plasma surfacing technology can greatly improve the service life, and can also realize the remanufacturing of parts, saving resources and exerting greater economic benefits.



1. Shield cutter

With the extension of the urban subway track network and the intensification of construction, the working area of the shield machine not only needs to pass through the common weak strata, but also needs to pass through some hard rock sections. It is generally believed that the scraper is suitable for soil layers and some soft rocks, and the disc hob is suitable for hard rock, and the single-edged hob needs to work in rocks with high strength (above 200 MPa). In order to prolong the service life of the hob disc, high-strength cemented carbide materials are usually surfacing on the surface of the hob cutter ring by plasma surfacing technology, which can greatly improve the wear resistance and compression performance of the parts, prolong the time for tool replacement, and improve the working surface. excavation efficiency.

2. Rotary excavator pick

Rotary excavators are widely used in industrial and civil construction because of their characteristics of no soil extrusion, low vibration, low noise, low pollution, high automation, fast drilling speed, safety, environmental protection and high efficiency in the process of hole forming. The pressure of the pressurizing system of the rotary excavator is transmitted through the drill pipe, so that the bucket picks cut into the rock and soil. Plasma arc surfacing welding of wear-resistant alloy materials at the wear-resistant belt at the tip of the pick can effectively improve the overall strength of the pick, and is a very effective surface strengthening process.

3. Plunger

The plunger is an important structural part of the plunger valve and is widely used in construction machinery. The cooperation between the plunger and the cylindrical sleeve belongs to the general cooperation of power transmission, which drives the connecting rod to complete the movement. Plasma surfacing technology is used to surfacing a layer of wear-resistant alloy material on the surface of the plunger, which can effectively improve its anti-wear performance and is an important guarantee for the stable and long-lasting operation of construction machinery.