A production equipment for continuously coating ultra-high molecular weight polyethylene on sucker rods

Abstract

The present invention discloses production equipment of a sucker rod continuously coated with ultrahigh molecular weight polyethylene, and the production equipment is prepared by connecting the components of a hydraulic pushing mechanism unit-1, a hydraulic pushing mechanism unit-2, a fixed limit wheel-1, a front tractor unit, an extrusion coating unit, a spray water tank cooling unit, a hydraulic pushing mechanism unit-3, a fixed limit wheel-2, a rear tractor unit and a piling frame in sequence. The extrusion coating unit includes an extruder, a split-type mold and a hydraulic mechanism, after the ultra high molecular weight polyethylene is plasticized and melted in the special extruder, the small diameter part of a standard sucker rod with large diameter two ends and a small diameter middle part is coated with the ultra high molecular weight polyethylene. Compared with the prior art, the small diameter part of the standard sucker rod with larger diameter difference (the maximum and minimum diameter difference may be up to 28.2mm) can be continuously coated, and the coating thickness can be adjusted.

Description

technical field [0001] The invention relates to a production equipment for continuously coating ultra-high molecular weight polyethylene on sucker rods, which is mainly for continuous coating on the small-diameter parts of standard sucker rods with large diameter at both ends and small diameter in the middle, and the coating thickness can be adjusted . Background technique [0002] Mechanical oil extraction is the main way of traditional oil extraction at home and abroad, and sucker rod is an indispensable consumable in oil extraction. In the process of oil extraction, the working environment of the sucker rod is always in the medium containing hydrogen sulfide, natural gas, dissolved oxygen, mud and drilling fluid, so its surface is easily corroded, worn and scaled, which affects the sucker rod performance and service life. [0003] At present, adding a protective layer to the surface of the sucker rod is one of the main methods to solve the corrosion and wear of the suck...

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are: 1) The metal protective layer can only improve the wear resistance of the sucker rod to a certain extent, but cannot slow down the corrosion of the sucker rod; 2) Most of the sprayed plastics do not have good wear resistance , which can easily lead to a shorter service life of the sucker rod; 3) lack of processing equipment for coating the surface of the standard sucker rod with a non-metallic protective layer, such as patent CN201883952U, which only mentions a coating of ultra-high molecular weight polyethylene anti-corrosion layer As for the sucker rod, there is no introduction on how to achieve coating and coating equipment

[0004] In addition, in the prior art of coating standard sucker rods, in order for the sucker rod to pass through the die, the size of the die outlet needs to be consistent with the maximum diameter of the sucker rod, so the thickness of the coating layer is usually too large, resulting in material Waste, increased production costs, etc., will also affect the performance of the sucker rod, especially the standard sucker rod with a large difference in cladding diameter, such as a standard sucker rod with ϕ22mm, the difference between the maximum diameter and the minimum diameter is 19.3 mm, cladding thickness will be as high as 9.65mm

Images