螺桿泵專(zhuān)用空心驅(qū)動(dòng)桿查看原圖（點(diǎn)擊放大）

Introduction: The drive rod specifically designed for screw pumps is a new type of specialized sucker rod developed by our company for surface-driven screw pump oil extraction devices. It enhances the strength of the drive rod string and the reliability of its connection points, thereby reducing the occurrence of common failures such as rod breakage, thread stripping, and loosening in the rod string.

Structure: There are two types of screw pump drive rods: solid and hollow. The connection methods are classified into two structural types (see Figures 1 and 2 for connection structures): (1) Double-shouldered straight thread structure, and (2) Wedge-shaped plug-in left-hand thread structure.

· Figure 1: Double-shouldered straight thread structure

· Figure 2: Wedge-shaped plug-in left-hand thread structure

Features:

1. High Overall Strength: The rod body, rod head, and coupling are all made of high-quality 35CrMo alloy steel, which undergoes quenching and tempering treatment to achieve excellent mechanical properties, ensuring easy control over quality (the heat treatment process is improved to enhance the yield strength of the sucker rod, thereby increasing its bending strength). The rod body, rod head, and coupling are welded together using friction welding, resulting in a small heat-affected zone at the weld seam. After tempering, the internal and external burrs of the weld seam are removed, and the external burrs are rolled. The weld seam is subjected to tensile testing to ensure it has the same strength as the rod body.

2. Strict Non-Destructive Testing Requirements for the Rod Body: The accuracy of non-destructive testing on the rod body is improved, with stringent control over surface defects and transverse cracks, thereby enhancing the bending strength of the sucker rod.

3. Plug-in Sucker Rod: The plug-in sucker rod relies on the plug-in fork to transmit torque. The fork is processed with high precision, providing excellent torque transmission. The threads only serve the purpose of connection and do not bear torque, which reduces the shear force on the threads and effectively minimizes the occurrence of thread stripping or loosening.

4. Double-Shouldered Straight Thread Sucker Rod: The connection thread diameter is increased (the thread diameter and specifications are larger than those specified by industry standards for the same specification sucker rods), allowing the threads to bear higher shear force and torque, thus providing higher strength. The threads are processed using non-cutting methods (extrusion, rolling), ensuring stable dimensions and high mating precision. The continuous metal fibers at the thread enhance strength by reducing stress concentration, allowing the threads to withstand greater torque without damage, and enabling multiple assembly and disassembly cycles. When connecting the rod head and coupling, the torque thrust surface is double-shouldered, which increases the contact area between the rod head and coupling, reduces deformation of the thrust surface, and converts torque into axial tensile force, thereby lowering the axial load on the thread teeth.