Due to the rotation of the rotor of the Zhigao screw air compressor in the barrel, lubricating oil and compressed gas rub against the screw and the body, causing the working surface of the screw to gradually wear out. The diameter of the screw gradually decreases, and the diameter of the inner hole of the body gradually wears out. As the Zhigao screw air compressor rotor rotates in the barrel, lubricating oil and compressed gas rub against the screw and the body, causing the working surface of the screw to gradually wear out. The diameter of the screw gradually decreases, The inner diameter of the body gradually increases< Br/>


In this way, the fit diameter gap between the screw and the body gradually increases as the two wear out. However, due to the unchanged resistance of the machine head and splitter plate in front of the body, this increases the leakage flow rate of the squeezed gas when it moves forward, that is, the flow rate of gas and lubricating oil from the diameter gap towards the intake direction increases. Over time, the rotor will gradually wear out< Br/>
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So, how to repair the worn rotor of Zhigao screw air compressor< Br/>


1、 Repair of the body



The internal surface hardness of the body is higher than that of the screw, and its damage occurs later than the screw. The scrapping of the body refers to the increase in inner diameter due to time wear and tear. Its repair method is as follows:



1. If there is still a certain nitriding layer on the body with increased diameter due to wear, the inner hole of the body can be directly bored and ground to a new diameter size, and then a new screw can be prepared according to this diameter< Br/>


2. The inner diameter of the body is machined, trimmed, and recast with alloy, with a thickness of 1-2mm, and then precision machined to size< Br/>
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2、 Repair of screw



1. The twisted screw should be considered based on the actual inner diameter of the body, and the outer diameter deviation of the new screw should be given according to the normal clearance with the body for manufacturing< Br/>


2. After treatment, the thread surface with reduced diameter of wear screw shall be Thermal spraying with wear-resistant alloy, and then grinded to size. This method is generally processed and repaired by professional spraying factories, and the cost is relatively low< Br/>


3. Weld wear-resistant alloy on the threaded part of the worn screw. Weld 1-2 mm thick according to the degree of screw wear, and then grind and process the screw to its size. This wear-resistant alloy is composed of materials such as C, Cr, Vi, Co, W, and B, which increases the wear and corrosion resistance of the screw. The cost of this type of processing is very high for professional surfacing factories, and it is generally rarely used except for screws with special requirements< Br/>


4. The method of surface plating with hard chromium can also be used to repair the screws of Zhigao screw air compressor. Chromium is also a wear-resistant and corrosion-resistant metal, but the hard chromium layer is relatively easy to fall off.