A centralizer assembly welding fixture

Abstract

The present application relates to the technical field of centralizer clamp, in particular to a centralizer assembling and welding clamp, which comprises a base, one end of the base is provided with a first stand, the other end of the base is provided with a second stand; a speed reducer box is fixedly installed at the top end of the first stand, a driving motor is arranged on one side of the speed reducer box, a rotating shaft box is slidably connected to the top end of the second stand, the speed reducer box and the rotating shaft box are both provided with rotating shafts, and the two groups of rotating shafts are axially aligned; a positioning mechanism is installed at the end of each rotating shaft, and an inner supporting positioning assembly is installed on the end face of the positioning mechanism in axial concentricity. The positioning mechanism realizes the circumferential clamping force on the ribs of the centralizer and improves the positioning accuracy. The profiled positioning groove at the end of the clamping plate matches the rib profile, enhances the contact area, and the profiled notch at the end of the push plate precisely fits the rib edge, cooperates with the clamping plate to form three-point clamping, and improves the stability of clamping. The inner supporting positioning assembly is self-adapting to different centralizer pipe diameters and improves the supporting stiffness.

Description

Technical Field

[0001] This invention relates to the field of centralizer fixture technology, and more specifically to a centralizer assembly and welding fixture. Background Technology

[0002] A centralizer is a specialized tool installed on an oil well drill string or casing string. Its core function is to ensure that the drill string or casing remains centered within the wellbore. By reducing direct contact between the drill string and the wellbore, it effectively reduces frictional resistance, prevents well deviation, improves drilling efficiency, and protects wellbore stability.

[0003] As a type of centralizer, the welded straight-rib rigid centralizer uses high-strength alloy steel as its base, with 3 or 6 ribs evenly distributed on its surface. The ribs are connected to the base through TIG welding or laser welding to achieve high strength.

[0004] In existing welding processes, operators often need to hold the ribs by hand while welding. However, this method makes it difficult to ensure the circumferential uniformity of the ribs, leading to a decrease in the dynamic balance performance of the stabilizer. Furthermore, the time-consuming assembly and welding of individual components reduces welding efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a centralizer assembly and welding fixture, employing dual-station synchronous clamping and adaptive positioning to achieve rapid rib positioning. Specifically, this is achieved through the following technical solution:

[0006] A welding fixture for assembling a centralizer includes a base, a first upright at one end of the base, and a second upright at the other end of the base. A reduction gearbox is fixedly installed on the top of the first upright, and a drive motor is provided on one side of the reduction gearbox. A shaft box is slidably connected to the top of the second upright. Both the reduction gearbox and the shaft box are provided with shafts, and the two sets of shafts are axially aligned. A positioning mechanism is installed at the end of each shaft, and an axially concentric inner support positioning component is installed on the end face of the positioning mechanism.

[0007] According to the above-mentioned aligner assembly welding fixture, the positioning mechanism includes a positioning end seat, one end of which has a central cavity, the inner support positioning component is installed in the central cavity, the other end of which has a second shaft seat, and the end of the second shaft seat has a first shaft seat fixedly connected to the rotating shaft; three sets of wide-type finger cylinders are evenly distributed on the circumference of the second shaft seat, and each wide-type finger cylinder has a connecting plate fixed to its two output ends, and a clamping plate is fixed to one side of the connecting plate; a support plate is fixed to the end of the first shaft seat, and three sets of first cylinders are evenly distributed on the circumference of one side of the support plate, the output end of the first cylinder has a mounting seat, and a push plate is fixed to one side of the mounting seat, the push plate being located between two sets of clamping plates.

[0008] According to the above-mentioned assembling and welding fixture for the centralizer, the push plate end is provided with a contour notch, and the clamping plate end is provided with a contour positioning groove on one side.

[0009] According to the above-mentioned assembly welding fixture for the centralizer, the outer edge of the positioning end seat is provided with a guide hole, the bottom end of the push plate is fixedly installed with a vertical plate, and a guide rod passing through the corresponding guide hole is fixed on one side of the vertical plate.

[0010] According to the above-mentioned centralizer assembly welding fixture, the inner support positioning component includes a cylinder and three sets of arc-shaped inner support plates. The three sets of arc-shaped inner support plates are distributed around the cylinder. The cylinder is fixedly connected to the central cavity through flanges located at the ends. A second cylinder is fixed inside the cylinder. A central seat is fixed at the output end of the second cylinder. A second connecting rod is hinged to one end of the inner end face of the arc-shaped inner support plate. One end of the second connecting rod is hinged to the central seat. Two sets of first connecting rods are hinged to the other end of the inner end face of the arc-shaped inner support plate. One end of the two sets of first connecting rods is hinged to the cylinder.

[0011] According to the above-mentioned assembly welding fixture for the centralizer, the outer surface of the arc-shaped inner support plate is provided with anti-slip stripes.

[0012] According to the above-mentioned aligner assembly welding fixture, the top of the second upright is supported by multiple sets of support seats and a top plate is mounted on the top of the top plate. Two sets of slide rail assemblies are fixed on the top of the top plate, and a support plate is installed between the two sets of slide rail assemblies. The shaft box is installed on the top of the support plate.

[0013] According to the above-mentioned accelerator assembly welding fixture, a servo motor is fixed on one side of the second stand, and a lead screw is installed on the top of the second stand. One end of the lead screw is fixedly connected to the output shaft of the servo motor through a coupling. A lead screw nut is provided on the lead screw, and the lead screw nut is fixed to the bottom of the shaft box.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are:

[0015] The positioning mechanism achieves circumferential clamping force on the centralizer ribs, improving positioning accuracy. The contoured positioning groove at the end of the clamping plate matches the rib profile, increasing the contact area, and the contoured notch at the end of the push plate precisely fits the rib edge, forming a three-point clamping mechanism with the clamping plate, thus improving clamping stability. The internal support positioning component adapts to different centralizer tube diameters, improving support rigidity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the shaft box installation.

[0019] Figure 3 A schematic diagram of the installation of the internal support positioning components;

[0020] Figure 4 This is a schematic diagram of the positioning mechanism;

[0021] Figure 5 This is a schematic diagram of the rotating shaft.

[0022] Figure 6 This is a structural schematic diagram of the internal support positioning component;

[0023] Figure 7 This is a schematic diagram of how the rib plate is clamped.

[0024] Figure 8 This is a schematic diagram showing the positioning of the rib plate.

[0025] Reference numerals: 1-Base, 2-First upright, 3-Reduction gearbox, 4-Drive motor, 5-Positioning mechanism, 6-Spindle box, 7-Second upright, 8-Internal support positioning assembly, 9-Top plate, 10-Slide rail assembly, 11-Support seat, 12-Servo motor, 13-Screw, 14-Support plate, 15-Positioning end seat, 16-Push plate, 17-Mounting seat, 18-Support plate, 19-Spindle, 20-First cylinder, 21-Connecting plate, 22-Clamping plate, 23-Center Cavity, 24-First shaft seat, 25-Wide finger cylinder, 26-Second shaft seat, 27-Guide hole, 28-Upright plate, 29-Guide rod, 30-Arc-shaped inner support plate, 31-First connecting rod, 32-Cylinder body, 33-Second cylinder, 34-Flange, 35-Second connecting rod, 36-Center seat, 37-Contouring notch, 38-Contouring positioning groove, 39-Arc-shaped waist hole, 40-First locking bolt, 41-First positioning plate, 42-Second positioning plate, 43-Second locking bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Those skilled in the art will recognize that the invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of it.

[0027] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a centralizer assembly welding fixture, mainly comprising a base 1, with a first upright 2 and a second upright 7 respectively disposed at both ends of the base 1. A reduction gearbox 3 is fixedly installed at the top of the first upright 2, and a drive motor 4 is disposed on one side of the reduction gearbox 3. A shaft box 6 is slidably connected to the top of the second upright 7. Both the reduction gearbox 3 and the shaft box 6 are provided with shafts 19, and the two sets of shafts 19 are axially aligned. A positioning mechanism 5 is installed at the end of each shaft 19, and an inner support positioning component 8 concentric with its axial direction is installed on the end face of the positioning mechanism 5, forming a dual-station synchronous clamping system.

[0029] like Figure 2 As shown, the top plate 9 is supported by four sets of rectangularly distributed support seats 11 at the top of the second support 7. Two sets of slide rail assemblies 10 are fixed to the top of the top plate 9, and a support plate 14 is installed between the two sets of slide rail assemblies 10. The shaft box 6 is fixed to the top of the support plate 14. A servo motor 12 is fixed to one side of the second support 7, and a lead screw 13 is installed at the top of the second support 7. One end of the lead screw 13 is fixedly connected to the output shaft of the servo motor 12 through a coupling. A lead screw nut is fitted on the lead screw 13, and the lead screw nut is fixed to the bottom of the shaft box 6. When the servo motor 12 is working, it converts the rotational motion into linear motion through the lead screw nut, driving the shaft box 6 to move laterally along the slide rail assembly 10 to accommodate the centralizer base of different lengths.

[0030] like Figure 3 , Figure 4 and Figure 7 As shown, the positioning mechanism 5 includes a positioning end seat 15. One end of the positioning end seat 15 is provided with a central cavity 23, and the internal support positioning assembly 8 is installed in the central cavity 23 by bolts. The other end of the positioning end seat 15 is provided with a second shaft seat 26, and the end of the second shaft seat 26 is provided with a first shaft seat 24. The first shaft seat 24 and the rotating shaft 19 are coaxially fixedly connected by a threaded connection or a spline coupling.

[0031] Three sets of wide-shaped finger cylinders 25, evenly distributed in a 120° circle, are mounted on the outer cylindrical surface of the second bearing 26. Each wide-shaped finger cylinder 25 has a connecting plate 21 fixed to its two output ends, and a clamping plate 22 is fixed to one side of the connecting plate 21. The wide-shaped finger cylinders 25 synchronously pull the clamping plates 22 on both sides to move towards each other, forming a symmetrical clamping force to ensure balanced force on both sides of the stabilizer ribs and prevent workpiece displacement. One end of the clamping plate 22 has a contoured positioning groove 38 that matches the contour of the stabilizer ribs, increasing the contact area and effectively preventing displacement caused by welding vibration.

[0032] A support plate 18 is fixed to the end of the first bearing seat 24. Three sets of first cylinders 20 are evenly distributed in a 120° circle on one side of the support plate 18. Each first cylinder 20 has a mounting seat 17 at its output end. A push plate 16 is fixed to one side of the mounting seat 17 and is located between two pairs of clamping plates 22. The first cylinder 20 drives the push plate 16 to move towards the center of the centralizer base. The contour notch 37 at its end can accurately fit the edge of the centralizer ribs. It works in conjunction with the contour positioning groove 38 on the clamping plate 22 to form a three-point clamping structure, which enhances the stability and positioning accuracy of the centralizer rib clamping.

[0033] like Figure 5 As shown, the outer edge of the circumferential surface of the positioning end seat 15 is provided with a guide hole 27, and a vertical plate 28 is fixedly installed at the bottom end of the push plate 16. A guide rod 29 is fixed on one side of the vertical plate 28. The guide rod 29 passes through the corresponding guide hole 27, which can effectively resist the lateral force during the movement and prevent the push plate 16 from swaying.

[0034] like Figure 6 As shown, the inner support positioning assembly 8 includes a cylinder 32 and three sets of arc-shaped inner support plates 30. The cylinder 32 is rigidly connected to the positioning end seat 15 via flanges 34 located at its ends. The three sets of arc-shaped inner support plates 30 are distributed around the outer periphery of the cylinder 32 at a 120° included angle. The outer surface of the arc-shaped inner support plates 30 is provided with anti-slip stripes to increase friction and prevent the centralizer base from rotating spontaneously.

[0035] A second cylinder 33 is fixed inside the cylinder 32, and a center seat 36 is fixed to the output end of the second cylinder 33. A second connecting rod 35 is hinged to the end of the inner surface of the arc-shaped inner support plate 30 away from the flange 34, and the other end of the second connecting rod 35 is hinged to the center seat 36. Two sets of first connecting rods 31 are hinged to the end of the inner surface of the arc-shaped inner support plate 30 near the flange 34, and the other ends of these two sets of first connecting rods 31 are hinged to the cylinder 32. The second connecting rod 35 and the two sets of first connecting rods 31 are arranged axially along the cylinder 32.

[0036] like Figure 8As shown, the positioning end seat 15 is also provided with a rib positioning assembly on the side facing the inner support positioning assembly 8. The rib positioning assembly includes a first positioning plate 41 and a second positioning plate 42. An arc-shaped waist hole 39 is provided on the positioning end seat 15. A first locking bolt 40 passes through the arc-shaped waist hole 39 to fix the first positioning plate 41, and a second locking bolt 43 passes through the arc-shaped waist hole 39 to fix the second positioning plate 42.

[0037] The following are the specific working principles and technical details of the centralizer assembly welding fixture.

[0038] The centralizer base is fitted onto any of the inner support positioning components 8. The servo motor 12 is started, driving the shaft box 6 to approach the reduction gearbox 3, thereby adjusting the spacing of the positioning mechanisms 5 at both ends until the centralizer base is in contact with the positioning end seats 15 at both ends. Simultaneously, the second cylinders 33 on both sides are started, pushing the center seat 36 axially, causing the three sets of arc-shaped inner support plates 30 to produce synchronous radial expansion motion, thereby conforming to the inner wall of the centralizer base and completing the precise positioning and clamping of the centralizer base.

[0039] The required centralizer ribs are fed to the underside of the centralizer base by an external feeding device (not shown in the figure). The wide-shaped finger cylinders 25 on both sides of the centralizer rib synchronously pull the clamping plates 22 to move in opposite directions, forming a symmetrical clamping force; at the same time, the first cylinders 20 on both sides of the centralizer rib synchronously drive the push plate 16 to move towards the center of the centralizer base, completing the clamping and positioning of the centralizer ribs.

[0040] Subsequently, drive motor 4 starts, causing the centralizer base and its centralizer ribs to rotate 120°. The feeding device then delivers the next required centralizer rib to the bottom of the centralizer base until all ribs are assembled. Afterward, it is sent to the welding station.

[0041] If the centralizer has six sets of ribs, welding is performed first when assembling three sets of ribs. After welding, loosen the first locking bolt 40 and the second locking bolt 43, and adjust the positions of the first positioning plate 41 and the second positioning plate 42. Select any assembled centralizer rib, place the first positioning plate 41 and the second positioning plate 42 on both sides of the rib, and tighten the first locking bolt 40 and the second locking bolt 43 to clamp the rib. At this point, the clamping position of the positioning mechanism 5 is reset, and the rib feeding process is repeated to complete the clamping of the other three sets of centralizer ribs.

[0042] The embodiments described above are not exhaustive and do not limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method of using a centralizer assembly welding fixture, the method comprising: The supporting device assembly welding clamp comprises a base (1), one end of the base (1) is provided with a first stand (2), the other end of the base (1) is provided with a second stand (7); the top end of the first stand (2) is fixedly provided with a speed reducer transmission box (3), one side of the speed reducer transmission box (3) is provided with a driving motor (4), the top end of the second stand (7) is slidably connected with a rotating shaft box (6), the speed reducer transmission box (3) and the rotating shaft box (6) are both provided with rotating shafts (19), and the two groups of rotating shafts (19) are axially aligned; the end of each rotating shaft (19) is provided with a positioning mechanism (5), and the end face of the positioning mechanism (5) is provided with an inner supporting positioning assembly (8) which is axially concentric; the positioning mechanism (5) comprises a positioning end seat (15), one end of the positioning end seat (15) is provided with a central cavity (23), the inner supporting positioning assembly (8) is mounted in the central cavity (23), the other end of the positioning end seat (15) is provided with a second shaft seat (26), and the end of the second shaft seat (26) is provided with a first shaft seat (24) which is fixedly connected with the rotating shaft (19); the second shaft seat (26) is provided with three groups of wide type finger air cylinders (25), the two output ends of each wide type finger air cylinder (25) are fixedly provided with a connecting plate (21), and one side of the connecting plate (21) is fixedly provided with a clamping plate (22); the end of the first shaft seat (24) is fixedly provided with a supporting plate (18), one side of the supporting plate (18) is provided with three groups of first air cylinders (20), the output end of the first air cylinder (20) is provided with a mounting seat (17), one side of the mounting seat (17) is fixedly provided with a push plate (16), and the push plate (16) is located between the two groups of clamping plates (22); The inner supporting positioning assembly (8) comprises a cylinder (32) and three groups of arc-shaped inner supporting plates (30), the three groups of arc-shaped inner supporting plates (30) are distributed around the cylinder (32), the cylinder (32) is fixedly connected with the central cavity (23) through the flange (34) arranged at the end, the inside of the cylinder (32) is fixedly provided with a second air cylinder (33), the output end of the second air cylinder (33) is fixedly provided with a central seat (36), one end of the inner end face of the arc-shaped inner supporting plate (30) is hingedly provided with a second connecting rod (35), one end of the second connecting rod (35) is hingedly connected to the central seat (36), and the other end of the inner end face of the arc-shaped inner supporting plate (30) is hingedly provided with two groups of first connecting rods (31), and one end of the two groups of first connecting rods (31) is hingedly connected to the cylinder (32); One side of the positioning end seat (15) towards the inner supporting positioning assembly (8) is also provided with a rib positioning assembly, the rib positioning assembly comprises a first positioning plate (41) and a second positioning plate (42), an arc-shaped waist hole (39) is formed in the positioning end seat (15), the first positioning plate (41) is fixed through the first locking bolt (40) penetrating through the arc-shaped waist hole (39), and the second positioning plate (42) is fixed through the second locking bolt (43) penetrating through the arc-shaped waist hole (39); The use method of the supporting device assembly welding clamp comprises the following steps: S1, the centralizer base is sleeved on any inner support positioning assembly (8), the driving shaft box (6) is driven to be close to the speed reducer transmission box (3), until the centralizer base is attached to the positioning end seat (15) at both ends; S2, the second cylinder (33) on both sides is started synchronously, the second cylinder (33) drives the central seat (36) to move axially, so that the three groups of arc-shaped inner support plates (30) produce synchronous radial expansion movement, and then the inner wall of the centralizer base is attached, the precise positioning and clamping of the centralizer base are completed; S3, the wide finger cylinder (25) synchronously pulls the clamping plate (22) to move towards each other, a symmetrical clamping force is formed, and the first cylinder (20) synchronously drives the push plate (16) to move to the center of the centralizer base, so that the clamping and positioning of a group of centralizer ribs are completed; S4, then the driving motor (4) is started, the centralizer base is rotated by 120°, and the step S3 is repeated until the assembly of three groups of centralizer ribs is completed, and welding operation is performed; S5, when the welding is completed, the first locking bolt (40) and the second locking bolt (43) are loosened, the positions of the first positioning plate (41) and the second positioning plate (42) are adjusted, any assembled centralizer rib is selected, the first positioning plate (41) and the second positioning plate (42) are arranged on both sides of the centralizer rib, the first locking bolt (40) and the second locking bolt (43) are tightened, the first positioning plate (41) and the second positioning plate (42) clamp the centralizer rib, and the steps S2, S3 and S4 are repeated to complete the clamping of the other three groups of centralizer ribs, and welding operation is performed.

2. The method of using a centralizer assembly welding fixture of claim 1, wherein: The end of the push plate (16) is provided with a profiled opening (37), and one side of the end of the clamping plate (22) is provided with a profiled positioning groove (38).

3. The method of using a centralizer assembly welding fixture of claim 1, wherein: The outer edge of the positioning end seat (15) is provided with a guide hole (27), the bottom end of the push plate (16) is fixedly installed with a vertical plate (28), and one side of the vertical plate (28) is fixedly provided with a guide rod (29) penetrating through the corresponding guide hole (27).

4. The method of using a centralizer assembly welding fixture of claim 1, wherein: The outer surface of the arc-shaped inner support plate (30) is provided with anti-skid stripes.

5. The method of using a centralizer assembly welding fixture of claim 1, wherein: The top end of the second stand (7) is provided with a top plate (9) through a plurality of support seats (11), the top end of the top plate (9) is fixedly provided with two groups of slide rail assemblies (10), a supporting plate (14) is installed between the two groups of slide rail assemblies (10), and the driving shaft box (6) is installed at the top end of the supporting plate (14).

6. The method of using a centralizer assembly welding fixture of claim 5, wherein: One side of the second stand (7) is fixedly provided with a servo motor (12), the top end of the second stand (7) is provided with a lead screw (13), one end of the lead screw (13) is fixedly connected with the output shaft of the servo motor (12) through a shaft coupling, the lead screw (13) is provided with a lead screw nut, and the lead screw nut is fixed at the bottom end of the driving shaft box (6).

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