Brief introduction:

Special drive screw pump rod is designed for the ground drive screw pump oil production equipment and developed a new type of special sucker rod, enhanced the intensity of the drive rod string and the reliability of the connection parts, reduce the sucker rod string is often broken rod, threaded, lu and other accidents.

Structure:

Special drive screw pump rod has two types of solid and hollow, its connection form has the following two structures (connection structure as shown in figure 1, figure 2), followed by: (1) shoulders straight thread structure, diction wedge plug left-hand thread structure.

Graph one shoulders straight thread structure

Figure 2 wedge plug left-hand thread structure

Features:

(1) high overall strength: rod body, head, collar 35 crmo material are of high quality alloy steel, after tempering process, the comprehensive mechanical performance is good, easy to control quality (by improving heat treatment process, improve the yield strength of sucker rod, so as to improve the bend strength of sucker rod); Rod body, head, collar by friction welding, the weld heat affected zone is small, weld after tempering treatment, removal of the internal and external flash, and the rolling processing, external flash weld drawing test, to ensure that the weld strength is consistent with the rod body.

2 strictly inspection requirement of the rod body, improve the detection precision of the rod body, strict control of surface defect and the transverse cracks increase the flexure strength of sucker rod.

(3) plug rod transmission torque, rely on the splice fork fork processing and cooperate with high accuracy, and good bearing shear; Threaded connection role, don't inherit the torque, thread shear force is small, can effectively reduce the take off and rolled thread.

(4) shoulders straight thread rod connecting thread diameter enlargement (thread diameter, specifications than the industry standard of the same specifications of the diameter of the sucker rod), the thread on the shear force, torque, high intensity, thread is not easy to take off, lu. Thread USES no cutting (extrusion, rolling), dimension stability, with high precision, metal fibre continuous in thread, reduced the stress concentration, the intensity is high, can bear large torque, thread is not damaged, can remove more; Push rod head, collar connection, the torque bearing surface for the shoulders (double), increases the rod head and collar tighten surface area, can reduce the deformation of the bearing surface, and reduce torque into axial force, reduces the thread bear axial negative