RU2164833C2 - Apparatus for straightening pump rods - Google Patents

Abstract

FIELD: plastic metal working, namely, equipment for tension straightening of elongated articles such as pump rods. SUBSTANCE: apparatus has gripper for gripping rod end mounted on tension head and being in the form of separate link with self-aligning supports on its ends. Rotary mechanism engages with rod end and it is mounted on tension head with possibility of fixation against rotation. Drive shaft is secured to aligning head coaxially relative to rod, said shaft is mounted by means of self-aligning support that may be fixed; it has open groove for rod end and locking device. On aligning head there is self-aligning gripper for gripping rod end. EFFECT: enhanced efficiency, improved quality of straightened pump rods. 5 dwg

Description

 The invention relates to the processing of metals by pressure, in particular, to equipment for straightening by stretching of long products such as sucker rods, and can be used at enterprises of the oil industry, leading repair and control of oilfield equipment.

 A device for dressing tensile products (patent RU N 2049572 C1) is known, which comprises a movable and fixed carriage with grippers for the ends of the rod mounted on the base, a hydraulic cylinder connected to a power source, the rod of which is rigidly connected to the movable carriage, and a control unit including a fixed base a fixed part with a scale and a moving part with a plate periodically interacting with the scale placed on a moving carriage.

 The disadvantage of this device is that the grips for the ends of the rods are adapted to rods of only limited curvature. This means that the rods, the ends of which have an angular deviation (with respect to the axis) greater than the allowable, must be pre-straightened before they get into the device for straightening the rods by stretching and .... In addition, experience shows that under all equal conditions a rod that has passed torsion-free editing often assumes some form of “former” curvature under the influence of residual stresses, as a result of triggering of the “memory” of the metal of the rod - there is insufficient quality of editing of the rods.

 In this regard, the operation of torsion of the rod, combined with the simultaneous application of a certain fraction (half) of the tensile force of the previous operation of drawing is necessary to relieve residual stresses in the body of the rod, which resembles the operation of a string of pump rods in a production environment using a rod rotator.

 The technical result is achieved due to the fact that the grip for the end of the rod on the tensile head is made in the form of a separate link with self-supporting bearings at the ends, the tensile head is equipped with a rotary mechanism contacting the square of the rod with the possibility of rotation locking, the installation head is equipped with a drive shaft located coaxially with the rod on a self-aligning and locking support, while on the drive shaft there is an open groove for the square of the rod and a locking device, and a grip for the end of angas on the mounting head is made spherical.

 In FIG. 1 shows a plan view of a device for straightening pump rods; in FIG. 2 is a section along line AA in FIG. in FIG. 3 is a section along the line BB in FIG. 2; FIG. 4 is a section along line BB in FIG. 1; in FIG. 5 is a leader under the designation I in FIG. 1.

 A device for editing pump rods contains a frame 1, located on the frame 1 installation 2 and extension 3 heads with grippers, respectively 4.5 for the ends of the rod 6 to be edited. The extension head 3 is connected to the rods 7 of the actuators 8 by means of a rigid connection 9, and the installation head 2 and the frame 1 are provided with holes 10, 11, respectively, for the fixing pins (not shown), which are used when moving the installation head 2 due to the large divergence of the lengths of the rods 6 ( A.S. 499918, Bulletin No. 3, 01/25/76).

 The stretching head 3 contains a separate self-aligning link 12 with spherical abutment surfaces at the ends 13 (Fig. 1), 14 (Fig. 4) respectively from the side of the ram 8 and the end of the rod 6 provided with an adapter 15 with a spherical head (Fig. 4). On the self-aligning link 12, a pharynx 17 is provided for mounting the adapter 15 with a hemispherical head 16, and to prevent the adapter 15 from falling out of the link 17, the closure casing 18 serves (Fig. 4). On the movable carriage 19 (Fig. 1), a rotary mechanism 20 is installed with an open groove 21 under the square of the rod 6 (Fig. 5). The pivoting mechanism 20, if necessary, can be fixed against rotation by a wedge 22 connected to a thread with a flywheel 23 (Fig. 5).

 The mounting head 2 (Fig. 1) is equipped with a drive shaft 24 located coaxially with the rod 6 on a self-aligning support 25 (Fig. 2) with rolling bearings (not specified) on the shaft 24, the retainer 26 of the angular position of the shaft 24, an asterisk 27. On the sprocket 27 put on a chain 28 connected to a drive (not specified) located, for example, under the frame 1 and rigidly connected to the installation head 2.

 On the drive shaft 24, a gripper for the end of the rod with a supporting spherical surface 29 is arranged, a gripping groove 30 for the adapter 31 of the rod 6 with the corresponding spherical head 32, and an open groove 33 is made for the end of the rod 6. The locking device 34 protects the adapter 31 from the throat 30 ( Fig. 3) with automatic locking.

 Device for straightening the sucker rods works as follows.

 It is necessary to lay out the previously washed pump rods on a rack (not specified), check the condition of the threaded ends of the rods with a caliber. Wrap adapters 15, 31 on the rod and install in the gripping grooves 17 and 30, respectively, which must be locked with the locking casing 18 and the locking device 34. Raise the pressure in the power cylinders 8 to the value of the preliminary dressing, turn off the oil station (not specified).

 Set the pointer to the zero mark of the “elongation” scale (not shown in Fig. 1), increasing the pressure in the cylinders 8, extend the rod to its extension by the required value (50 mm). Make a technological shutter speed for 2 minutes, reduce the working pressure by half, fix the rotary mechanism 20 from turning by means of a wedge 22 with a flywheel 23, fix the spherical support 25 of the drive shaft 24 with the retainer 26 of the angular position. After that, turn on the torsion drive (not shown) of the drive shaft 24 and turn the rod to the required angle. According to computer software, the state of the rod is determined, i.e. it is suitable for operation or not.

 Relieve pressure from the power cylinders, release the rod from the grippers and adapters 15, 31, and feed the rod to the appropriate rack as it is fit.

 In the future, the technological cycle is repeated.

 The device provides high-performance and high-quality straightening of sucker rods by combining the technological operations of tension and torsion.

Claims (1)

 A device for straightening pump rods, comprising an installation and extension head located on the frame with grippers for the ends of the rod, a power cylinder with a rod connected to the extension of the extension head, and a control unit made in the form of a pointer placed on the extension head and installed to interact with it plate with a scale mounted on the frame, characterized in that it is equipped with a rotary mechanism mounted on a tensile head with the ability to contact with the end of the rod and fix it from pr gate, located coaxially with the rod on the self-aligning and locking support, the drive shaft with an open groove at the end of the rod and the locking device, the grip for the end of the rod on the extension head is made as a separate link with self-supporting bearings at the ends and the locking casing, and the capture for the end of the rod on the installation head is self-aligning.

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