Sucker rod elevator and centering device

Abstract

The present invention relates to the field of automation of sucker rod operation, and discloses a sucker rod elevator and centering device, which includes a sucker rod elevator core-buffering assembly and a sucker rod centering assembly; the sucker rod elevator core-buffering assembly includes a core-buffering body, a linkage core-buffering mechanism and a hydraulic drive mechanism; the sucker rod centering assembly includes a base, a cylinder, a hinge mechanism and a clamping centering mechanism; the linkage core-buffering mechanism includes a clamping core-buffering seat, a replaceable clamping core-buffering and a rotating gear plate, the hydraulic drive mechanism includes a hydraulic cylinder, a cylinder seat, a movable seat and a guide fixed seat, the hinge mechanism includes a cylinder hinge ear, a hinge ear pin and a cylinder connecting rod, and the clamping centering mechanism includes a side square tube, a transition square tube, a centering square tube and a centering splint. The present invention can be driven by hydraulic core-buffering without manual operation, and the range of specifications suitable for sucker rods is widened; the centering effect is ideal, and the quality and efficiency of sucker rod operations are improved; the integrated setting is conducive to rapid positioning and improves installation efficiency.

Description

Technical Field

[0001] The invention relates to the field of sucker rod operation automation, and in particular to a sucker rod elevator and a centering device. Background Art

[0002] Traditional sucker rod lifting and lowering operations mainly rely on manual operations, which are labor-intensive, inefficient, and have high safety risks. For example, the lifting and lowering of the sucker rod during well repair operations requires workers to repeatedly lift the elevator and remove the lifting ring, which is not only time-consuming and labor-intensive, but also prone to accidents due to improper operation.

[0003] With the continuous development of petroleum equipment technology, automation and intelligent equipment have been gradually applied to sucker rod lifting and lowering operations, and some operations have been automated. However, there are still some technical problems that need to be solved during the operation. On the one hand, the sucker rod elevator lacks a core filling design and has a narrow adaptability to the specifications of the sucker rods. On the other hand, there is a lack of a simple and effective sucker rod centering device that is compatible with the sucker rod elevator at the wellhead. When the sucker rod swings widely, it is difficult to center the sucker rod, which seriously affects the quality and efficiency of the sucker rod operation. Summary of the invention

[0004] In order to effectively solve the above technical problems, the present invention provides a sucker rod elevator and a centering device, and the technical solution is as follows: A sucker rod elevator and a centering device, wherein the sucker rod elevator comprises a sucker rod elevator body, wherein the sucker rod elevator body is provided with an elevator body inner hole; the device comprises a sucker rod elevator bushing assembly assembled in the elevator body inner hole and a sucker rod centering assembly assembled in the sucker rod slip; the sucker rod elevator bushing assembly comprises an integrally connected bushing body, a linkage bushing mechanism and a hydraulic drive mechanism; the sucker rod centering assembly comprises an integrally connected base, a cylinder, a hinge mechanism and a clamping centering mechanism.

[0005] The bushing body comprises an upper connecting body and a bushing cavity connected thereto; the upper connecting body is connected to the inner hole of the elevator body; a linkage bushing mechanism and a hydraulic drive mechanism are installed on the bushing cavity; and the lower part of the bushing cavity is configured as a bell mouth.

[0006] The linkage bushing mechanism comprises a bushing holder, a replaceable bushing and a rotating toothed disc. The upper front part of the bushing holder is provided with a slot and the lower part is provided with a semi-trumpet-shaped slot. The rear side of the bushing holder is provided with an arc-shaped body. A through spindle hole is provided inside the arc-shaped body. A clamping protrusion that matches the slot is provided at the rear of the replaceable bushing. The replaceable bushing is connected and assembled with the slot of the bushing holder through its clamping protrusion. A semi-cylindrical slot is provided at the front part of the replaceable bushing. A semi-trumpet-shaped arc surface is provided at the top of the semi-cylindrical slot. The combination of the bushing holder and the replaceable bushing comprises a left bushing assembly and a right bushing assembly corresponding to each other. The left bushing assembly and the right bushing assembly are located inside the bushing cavity. The rotating toothed disc comprises mutually corresponding bushing assemblies. The corresponding left-rotating toothed disc and right-rotating toothed disc are respectively located on both sides outside the bushing cavity. A left spindle is fixed inwardly at the rear end center of the left-rotating toothed disc, and a left tooth row is provided on the front end surface. A right spindle is fixed inwardly at the rear end center of the right-rotating toothed disc, and a right tooth row is provided on the front end surface. The left tooth row and the right tooth row can mesh. A small shaft is fixed outwardly at the lower rear end of the right-rotating toothed disc. The left spindle crosses the wall hole on the bushing cavity and continues to penetrate into the spindle hole on the left bushing assembly and the opposite wall hole. The right spindle crosses the wall hole on the bushing cavity and continues to penetrate into the spindle hole on the right bushing assembly and the opposite wall hole. The left spindle and the right spindle are respectively fixed to their corresponding spindle holes and can rotate in their corresponding wall holes.

[0007] The hydraulic drive mechanism is located outside the bushing cavity, and includes a hydraulic cylinder and a cylinder seat on the left, a moving seat on the right, and a guide fixed seat at the bottom. The hydraulic cylinder is connected to the cylinder seat through a pin shaft, the cylinder seat is fixed to the guide fixed seat, and the guide fixed seat is fixed to the outer bottom of the bushing cavity. A guide groove in the left and right directions is provided upward on the right side of the guide fixed seat. The moving seat reciprocates in the guide groove through a slider at the bottom thereof. The front end of the hydraulic cylinder piston rod is fixedly connected to the moving seat. An arc-shaped long hole inclined to the upper right is provided on the upper part of the moving seat, and the outer end of the small shaft of the right rotating toothed disc can move in the arc-shaped long hole.

[0008] The guide groove is a T-shaped guide groove.

[0009] The oil cylinder seat is fixed to the guide fixing seat by welding, and the guide fixing seat is fixed to the core-buffering cavity by welding.

[0010] The front end of the hydraulic cylinder piston rod is fixed to the moving seat by means of threaded connection.

[0011] The base of the sucker rod centering assembly is set as a rectangular tube base, the middle of the rectangular tube base is provided with a cylinder fixed shaft, and the two sides are provided with lateral tube fixed shafts; the lower part of the cylinder is fixed to the rectangular tube base through the cylinder fixed shaft; the hinge mechanism includes a cylinder hinge ear, a hinge ear pin and two cylinder connecting rods, the cylinder hinge ear is fixed to the top of the piston rod of the cylinder, and the tops of the two cylinder connecting rods are hinged to the hinge ear pins on the cylinder hinge ear; the clamping centering mechanism includes two corresponding left and right groups, each group includes a lateral tube, a transition square tube, a centering square tube and a centering splint, and the bottom end of the lateral tube is installed on the On the lateral square tube fixed shaft, the outer side of the lower part of the lateral tube is provided with a cylinder connecting rod fixed shaft for installing the bottom end of the cylinder connecting rod, the upper end of the lateral tube is vertically connected to the transition square tube, and the front end of the transition square tube is connected to the oriented square tube at a right angle on the horizontal plane. Upper and lower centering clamps parallel to each other and both in the shape of < are installed above and below the front end of the oriented square tube. When the left and right groups of centering clamps face the sucker rod and move towards each other, the two groups of upper centering clamps can clamp the sucker rod from the left and right directions to form an upper positioning point, and the two groups of lower centering clamps can clamp the sucker rod from the left and right directions to form a lower positioning point.

[0012] The oil cylinder fixed shaft and the side square tube fixed shaft are welded on the rectangular tube base; the side square tube, transition square tube, centering square tube, centering clamp, oil cylinder connecting rod fixed shaft and sleeve of each group of the clamping centering mechanism are integrally formed by welding.

[0013] The sucker rod centering assembly, the sucker rod slips and the sucker rod hydraulic pliers of the wellhead operation equipment are arranged as an integrated structure, the sucker rod slips are connected to the self-sealing gland of the wellhead, a workbench is built based on the self-sealing gland, and the mounting base of the sucker rod hydraulic pliers is fixed to the workbench by bolts.

[0014] Compared with the prior art, the present invention mainly has the following beneficial technical effects: 1. The present invention realizes core packing under hydraulic drive through the arrangement of the sucker rod elevator bushing assembly, which does not require manual operation. It has a simple structure and can hang various specifications of 16 / 19 / 22 / 25 / 29 sucker rods, effectively expanding the range of sucker rod specifications.

[0015] 2. The present invention realizes the goal of simplifying the mechanical structure and idealizing the centering effect by setting up the sucker rod centering assembly. Even when the sucker rod swings with a large amplitude, it can still play a good centering role, greatly improving the quality and efficiency of the sucker rod operation.

[0016] 3. The present invention realizes rapid positioning and improves installation efficiency by integrating the sucker rod centering assembly, the sucker rod slips and the sucker rod hydraulic clamps.

[0017] 4. The production cost is low, which is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structural layout of the present invention; Figure 2 This is a schematic diagram of the sucker rod elevator structure of the present invention; Figure 3 It is a schematic diagram of the overall structure of the sucker rod elevator bushing assembly of the present invention; Figure 4 It is a schematic diagram of a combination of a bushing holder and a replaceable bushing of the present invention; Figure 5 This is a schematic diagram of the structure of the left rotating gear disc and the left main shaft of the present invention; Figure 6 It is a schematic diagram of the structure of the right rotating gear disc, the right main shaft and the small shaft of the present invention; Figure 7 It is a three-dimensional schematic diagram of the sucker rod elevator bushing assembly in the closed state of the present invention; Figure 8 It is a front view schematic diagram of the sucker rod elevator bushing assembly in a closed state of the present invention; Fig. 9 It is a rear view schematic diagram of the sucker rod elevator bushing assembly in the closed state of the present invention (the sucker rod is not shown); Fig.10 It is a rear view schematic diagram of the sucker rod elevator bushing assembly in the closed state of the present invention (showing the sucker rod); Fig.11 It is a three-dimensional schematic diagram of the sucker rod elevator bushing assembly in the open state of the present invention; Fig.12 It is a front view schematic diagram of the sucker rod elevator bushing assembly in the open state of the present invention; Fig.13 It is a rear view schematic diagram of the sucker rod elevator bushing assembly in the open state of the present invention (the sucker rod is not shown); Fig.14 It is a rear view schematic diagram of the sucker rod elevator bushing assembly in the open state of the present invention (showing the sucker rod); Fig.15 It is a three-dimensional schematic diagram of the state in which the centering clamps of the left and right groups of the clamping centering mechanism of the sucker rod centering assembly of the present invention are not clamping the sucker rod; Fig.16 It is a front view schematic diagram of the centering clamps of the left and right groups of the clamping centering mechanism of the sucker rod centering assembly of the present invention in the state where the sucker rod is not clamped; Fig.17 It is a three-dimensional schematic diagram of the state where the centering clamps of the left and right groups of the clamping centering mechanism of the sucker rod centering assembly of the present invention clamp the sucker rod; Fig.18 It is a front view schematic diagram of the state where the centering clamps of the left and right groups of the clamping centering mechanism of the sucker rod centering assembly of the present invention clamp the sucker rod; In the figure: 1-sucker rod elevator, 2-sucker rod elevator body, 3-sucker rod elevator bushing assembly, 4-sucker rod centering assembly, 5-sucker rod slip, 6-workbench, 7-sucker rod, 8-self-sealing gland, 9-sucker rod hydraulic clamp, 10-hydraulic drive mechanism, 11-linked bushing mechanism, 12-bucking body, 13-upper body, 14-bucking cavity, 15-bell mouth, 16-wall hole, 17-semi-cylindrical groove, 18-semi-bell mouth arc surface, 19-replaceable clamping bushing, 20-clamping convex, 21-clamping groove, 22-spindle hole, 23-arc body, 24-clamping bushing seat, 25-semi-bell mouth groove, 26-left spindle, 27-left rotating gear plate, 28-left gear row, 29-right gear row, 30-right rotating gear disc, 31-small shaft, 32-right main shaft, 33-left core-bushing assembly, 34-right core-bushing assembly, 35-guide groove, 36-arc long hole, 37-moving seat, 38-guide fixed seat, 39-hydraulic cylinder piston rod, 40-hydraulic cylinder, 41-cylinder seat, 42-pin shaft, 43-rotating gear disc, 44-lateral square tube, 45-transition square tube, 46-aligned square tube, 47-centering splint, 47.1-upper centering splint, 47.2-lower centering splint, 48-rectangular tube base, 49-cylinder hinge ear, 50-hinge ear pin shaft, 51-cylinder connecting rod, 52-cylinder connecting rod fixed shaft, 53-sleeve, 54-lateral square tube fixed shaft, 55-cylinder fixed shaft, 56-cylinder. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific embodiments and drawings. Example 1

[0020] See also Figures 1 to 18 A sucker rod elevator and a centering device, a sucker rod elevator 1 includes a sucker rod elevator body 2, and the sucker rod elevator body 2 is provided with an elevator body inner hole; the device includes a sucker rod elevator bushing assembly 3 assembled in the elevator body inner hole and a sucker rod centering assembly 4 assembled in a sucker rod slip 5; the sucker rod elevator bushing assembly 3 includes an integrally connected bushing body 12, a linkage bushing mechanism 11 and a hydraulic drive mechanism 10; the sucker rod centering assembly 4 includes an integrally connected base, a cylinder 56, a hinge mechanism and a clamping centering mechanism.

[0021] The bushing body 12 includes an upper connecting body 13 and a bushing cavity 14 connected thereto. The upper connecting body 13 is connected to the inner hole of the elevator body. The linkage bushing mechanism 11 and the hydraulic drive mechanism 10 are installed on the bushing cavity 14. The lower part of the bushing cavity 14 is configured as a bell mouth 15 to facilitate the guidance of the sucker rod 7.

[0022] The linkage bushing mechanism 11 includes a bushing holder 24, a replaceable bushing 19 and a rotating toothed disc 43; the front upper part of the bushing holder 24 is provided with a slot 21, the lower part is provided with a semi-flare-shaped slot 25, the rear side of the bushing holder 24 is provided with an arc-shaped body 23, the arc-shaped body 23 is provided with a through spindle hole 22, the rear part of the replaceable bushing 19 is provided with a protrusion 20 that matches the slot 21, and the replaceable bushing 19 is connected to the bushing holder through its protrusion 20 The slots 21 of the replaceable holding bushing 19 are connected and assembled together; the front part of the replaceable holding bushing 19 is provided with a semi-cylindrical groove 17, and the top of the semi-cylindrical groove 17 is provided with a semi-flared arc surface 18 so as to match the arc surface at the end of the sucker rod 7; the assembly of the holding bushing seat 24 and the replaceable holding bushing 19 includes a left bushing assembly 33 and a right bushing assembly 34 corresponding to each other, and the left bushing assembly 33 and the right bushing assembly 34 are located inside the bushing cavity 14; the rotating gear disc The left rotating toothed disc 27 and the right rotating toothed disc 30 correspond to each other. The left rotating toothed disc 27 and the right rotating toothed disc 30 are respectively located on both sides of the outside of the core-bushing cavity 14. The left main shaft 26 is fixed inwardly at the rear end center of the left rotating toothed disc 27, and the front end surface is provided with a left tooth row 28. The right main shaft 32 is fixed inwardly at the rear end center of the right rotating toothed disc 30, and the front end surface is provided with a right tooth row 29. The left tooth row 28 and the right tooth row 29 can mesh. The rear end of the right rotating toothed disc 30 is downwardly directed to the left. A small shaft 31 is fixed outside. The left main shaft 26 crosses the wall hole 16 on the bushing cavity 14 and continues to penetrate into the main shaft hole 22 on the left bushing assembly 33 and the opposite wall hole 16. The right main shaft 32 crosses the wall hole 16 on the bushing cavity 14 and continues to penetrate into the main shaft hole 22 on the right bushing assembly 34 and the opposite wall hole 16. The left main shaft 26 and the right main shaft 32 are respectively fixed to their corresponding main shaft holes 22 and can rotate in their corresponding wall holes 16.

[0023] The hydraulic drive mechanism 10 is located outside the bushing cavity 14, and includes a hydraulic cylinder 40 and a cylinder seat 41 on the left, a moving seat 37 on the right, and a guide fixed seat 38 at the bottom. The hydraulic cylinder 40 is connected to the cylinder seat 41 through a pin 42. The cylinder seat 41 is fixed to the guide fixed seat 38. The guide fixed seat 38 is fixed to the outer bottom of the bushing cavity 14. A guide groove 35 in the left and right directions is provided upward on the right side of the guide fixed seat 38. The moving seat 37 reciprocates in the guide groove 35 through a slider at the bottom thereof. The front end of the hydraulic cylinder piston rod 39 is fixedly connected to the moving seat 37. The upper part of the moving seat 37 is provided with an arc-shaped long hole 36 inclined to the upper right. The outer end of the small shaft 31 of the right rotating gear plate 30 can move in the arc-shaped long hole 36.

[0024] The base of the sucker rod centering assembly 4 is set as a rectangular tube base 48, and a cylinder fixed shaft 55 is provided in the middle of the rectangular tube base 48, and lateral tube fixed shafts 54 are provided on both sides; the lower part of the cylinder 56 is fixed to the rectangular tube base 48 through the cylinder fixed shaft 55; the hinge mechanism includes a cylinder hinge ear 49, a hinge ear pin 50 and two cylinder connecting rods 51, the cylinder hinge ear 49 is fixed to the top of the piston rod of the cylinder 56, and the tops of the two cylinder connecting rods 51 are hinged to the hinge ear pin 50 on the cylinder hinge ear 49; the clamping centering mechanism includes two corresponding left and right groups, each group includes a lateral tube 44, a transition square tube 45, a centering square tube 46 and a centering clamp 47, and the bottom end of the lateral tube 44 is installed through a shaft sleeve 53 On the lateral tube fixing shaft 54, a cylinder connecting rod fixing shaft 52 for mounting the bottom end of the cylinder connecting rod 51 is provided on the outer side of the lower part of the lateral tube 44, the upper end of the lateral tube 44 is vertically connected to the transition square tube 45, and the front end of the transition square tube 45 is connected to the aligning square tube 46 at a right angle on the horizontal plane, and upper and lower centering clamps 47.1 and 47.2 which are parallel to each other and are both in the shape of < are installed above and below the front end of the aligning square tube 46. When the left and right groups of centering clamps 47 face the sucker rod 7 and move towards each other, the two groups of upper centering clamps 47.1 can clamp the sucker rod 7 from the left and right directions to form an upper positioning point, and the two groups of lower centering clamps 47.2 can clamp the sucker rod 7 from the left and right directions to form a lower positioning point. Example 2

[0025] See also Figures 1 to 18 The sucker rod elevator and centering device is based on the technical solution described in Example 1, wherein the guide groove 35 is a T-shaped guide groove to enhance the stability of the guide for the carrying movable seat 37 . Example 3

[0026] See also Figures 1 to 18 The sucker rod elevator and centering device is based on the technical solution described in Example 1, wherein the cylinder seat 41 is welded and fixed to the guide fixing seat 38, and the guide fixing seat 38 is welded and fixed to the bushing cavity 14 to enhance firmness. Example 4

[0027] See also Figures 1 to 18 The sucker rod elevator and centering device is based on the technical solution described in Example 1, and the front end of the hydraulic cylinder piston rod 39 is fixed to the moving seat 37 by a threaded connection to facilitate disassembly. Example 5

[0028] See also Figures 1 to 18The sucker rod elevator and centering device, based on the technical solution described in Example 1, the oil cylinder fixed shaft 55 and the side pipe fixed shaft 54 ​​are welded to the rectangular pipe base 48; the side pipe 44, the transition square pipe 45, the centering square pipe 46, the centering clamp 47, the oil cylinder connecting rod fixed shaft 52 and the shaft sleeve 53 of each group of the clamping centering mechanism are integrally formed by welding, which enhances the structural firmness and the convenience of installation. Example 6

[0029] See also Figures 1 to 18 The sucker rod elevator and centering device is based on the technical solution recorded in Example 1. The sucker rod centering assembly 4, the sucker rod slip 5 and the sucker rod hydraulic clamp 9 are set as an integrated structure. The sucker rod slip 5 is connected to the self-sealing gland 8 of the wellhead. The workbench 6 is built based on the self-sealing gland 8. The mounting base of the sucker rod hydraulic clamp 9 is fixed to the workbench 6 by bolts, which is very convenient to install.

[0030] In order to enable those skilled in the art to better understand the present invention, the basic working principle of the present invention is briefly described as follows: The sucker rod elevator body 2 of the present invention is the same as the common tubing elevator, which is an existing structure; the sucker rod elevator bushing assembly 3 is dedicated to the sucker rod 7. The replaceable holding bushing 19 can be replaced in size according to the size of the sucker rod 7. The hydraulic cylinder 40 drives the moving seat 37 to move, thereby driving the small shaft 31 of the right rotating gear plate 30 to move in the arc-shaped long hole 36, and the right rotating gear plate 30 rotates around the right main shaft 32. The left rotating gear plate 27 and the right rotating gear plate 30 cooperate through the left tooth row 28 and the right tooth row 29, so the two rotate synchronously, driving the holding bushing seat 24 of the left bushing assembly 33 and the right bushing assembly 34 to rotate, so that the replaceable holding bushing 19 of the left bushing assembly 33 and the right bushing assembly 34 can be opened and closed, thereby releasing and confining the sucker rod 7. The oil cylinder 56 pushes the oil cylinder hinge ear 49, driving the oil cylinder connecting rod 51, and the oil cylinder connecting rod 51 drives the left and right groups of the clamping centering mechanism to move synchronously. The centering splints 47 of the left and right groups face the sucker rod 7 and move towards each other. The upper centering splints 47.1 of the two groups clamp the sucker rod 7 from the left and right directions to form an upper positioning point, and the lower centering splints 47.2 of the two groups clamp the sucker rod 7 from the left and right directions to form a lower positioning point, so as to achieve accurate centering of the sucker rod 7. The centering splint 47 is large in size, which can have a better centering effect, and can achieve centering even if the sucker rod 7 shakes a lot. Since the sucker rod centering assembly 4, the sucker rod slip 5 and the wellhead operation equipment sucker rod hydraulic clamp 9 (which realizes the installation and removal of the sucker rod 7 by tightening and loosening the connecting parts of the sucker rod 7) are an integral structure, rapid positioning can be achieved and installation efficiency is improved.

Claims

1. A sucker rod elevator and a centering device, wherein the sucker rod elevator comprises a sucker rod elevator body, the sucker rod elevator body is provided with an elevator body inner hole, and is characterized in that: The device comprises a sucker rod elevator bushing assembly mounted on the inner hole of an elevator body and a sucker rod centering assembly mounted on a sucker rod slip; the sucker rod elevator bushing assembly comprises a bushing body, a linkage bushing mechanism and a hydraulic drive mechanism connected as one body; the sucker rod centering assembly comprises a base, a cylinder, a hinge mechanism and a clamping centering mechanism connected as one body; the bushing body comprises an upper connecting body and a bushing cavity connected thereto, the upper connecting body is connected to the inner hole of the elevator body, and a linkage bushing mechanism and a hydraulic drive mechanism are installed on the bushing cavity; the linkage bushing mechanism comprises a bushing holder, a replaceable bushing holder and a rotating gear disc; the clamping centering mechanism comprises two corresponding left and right groups, each of which comprises a side square tube, a transition square tube, a centering square tube and a centering splint.

2. The sucker rod elevator and centering device according to claim 1, characterized in that: The lower part of the core-buffering cavity is configured as a bell mouth.

3. The sucker rod elevator and centering device according to claim 1, characterized in that: The upper front part of the clamping bushing seat of the linkage bushing mechanism is provided with a clamping groove and a semi-trumpet-shaped groove at the lower part. The rear side of the clamping bushing seat is set as an arc-shaped body, and a through spindle hole is set inside the arc-shaped body. The rear part of the replaceable clamping bushing is provided with a clamping protrusion that matches the clamping groove. The replaceable clamping bushing is clamped and combined with the clamping groove of the clamping bushing seat through its clamping protrusion. The front part of the replaceable clamping bushing is provided with a semi-cylindrical groove, and the top of the semi-cylindrical groove is set as a semi-trumpet-shaped arc surface. The combination of the clamping bushing seat and the replaceable clamping bushing includes a left bushing assembly and a right bushing assembly corresponding to each other, and the left bushing assembly and the right bushing assembly are located inside the bushing cavity; the rotating toothed disc includes a left rotating toothed disc and a right rotating toothed disc corresponding to each other. Rotating toothed discs, the left rotating toothed disc and the right rotating toothed disc are respectively located on both sides outside the bushing cavity. A left spindle is fixed inwardly at the rear end center of the left rotating toothed disc, and a left tooth row is provided on the front end surface. A right spindle is fixed inwardly at the rear end center of the right rotating toothed disc, and a right tooth row is provided on the front end surface. The left tooth row and the right tooth row can mesh. A small shaft is fixed outwardly at the lower rear end of the right rotating toothed disc. The left spindle crosses the wall hole on the bushing cavity and continues to penetrate into the spindle hole on the left bushing assembly and the opposite wall hole. The right spindle crosses the wall hole on the bushing cavity and continues to penetrate into the spindle hole on the right bushing assembly and the opposite wall hole. The left spindle and the right spindle are respectively fixed to their corresponding spindle holes and can rotate in their corresponding wall holes.

4. The sucker rod elevator and centering device according to claim 1, characterized in that: The base of the sucker rod centering assembly is set as a rectangular tube base, the middle of the rectangular tube base is provided with a cylinder fixed shaft, and the two sides are provided with side tube fixed shafts; the lower part of the oil cylinder is fixed to the rectangular tube base through the cylinder fixed shaft; the hinge mechanism includes a cylinder hinge ear, a hinge ear pin shaft and two cylinder connecting rods, the cylinder hinge ear is fixed to the top of the piston rod of the oil cylinder, and the tops of the two cylinder connecting rods are hinged to the hinge ear pin shaft on the cylinder hinge ear; the bottom end of the side tube of the clamping centering mechanism is installed on the side tube fixed shaft through a shaft sleeve, and the outer side of the lower part of the side tube is provided with A cylinder connecting rod fixing shaft is provided for installing the bottom end of the cylinder connecting rod, the upper end of the lateral square tube is vertically connected to the transition square tube, the front end of the transition square tube is right-angledly connected to the aligning square tube on the horizontal plane, and upper and lower centering clamps parallel to each other and both in the shape of < are installed above and below the front end of the aligning square tube. When the left and right groups of centering clamps face the sucker rod and move towards each other, the two groups of upper centering clamps can clamp the sucker rod from left and right directions to form an upper positioning point, and the two groups of lower centering clamps can clamp the sucker rod from left and right directions to form a lower positioning point.

5. The sucker rod elevator and centering device according to claim 1, characterized in that: The hydraulic drive mechanism is located outside the bushing cavity, and includes a hydraulic cylinder and a cylinder seat on the left, a moving seat on the right, and a guide fixed seat at the bottom. The hydraulic cylinder is connected to the cylinder seat through a pin shaft, the cylinder seat is fixed to the guide fixed seat, and the guide fixed seat is fixed to the outer bottom of the bushing cavity. A guide groove in the left and right directions is provided upward on the right side of the guide fixed seat. The moving seat reciprocates in the guide groove through a slider at the bottom thereof. The front end of the hydraulic cylinder piston rod is fixedly connected to the moving seat. An arc-shaped long hole inclined to the upper right is provided on the upper part of the moving seat, and the outer end of the small shaft of the right rotating toothed disc can move in the arc-shaped long hole.

6. The sucker rod elevator and centering device according to claim 5, characterized in that: The guide groove is a T-shaped guide groove.

7. The sucker rod elevator and centering device according to claim 5, characterized in that: The oil cylinder seat is fixed to the guide fixing seat by welding, and the guide fixing seat is fixed to the core-buffering cavity by welding.

8. The sucker rod elevator and centering device according to claim 5, characterized in that: The front end of the hydraulic cylinder piston rod is fixed to the moving seat by means of threaded connection.

9. The sucker rod elevator and centering device according to claim 4, characterized in that: The oil cylinder fixed shaft and the side square tube fixed shaft are welded on the rectangular tube base; the side square tube, transition square tube, centering square tube, centering clamp, oil cylinder connecting rod fixed shaft and sleeve of each group of the clamping centering mechanism are integrally formed by welding.

10. The sucker rod elevator and centering device according to any one of claims 1 to 9, characterized in that: The sucker rod centering assembly, the sucker rod slips and the sucker rod hydraulic pliers of the wellhead operation equipment are arranged as an integrated structure, the sucker rod slips are connected to the self-sealing gland of the wellhead, a workbench is built based on the self-sealing gland, and the mounting base of the sucker rod hydraulic pliers is fixed to the workbench by bolts.

Images