Centralizer assembling and welding clamp

Abstract

The invention relates to the technical field of centralizer clamps, in particular to a centralizer assembling and welding clamp which comprises a base, a first vertical seat is arranged at one end of the base, and a second vertical seat is arranged at the other end of the base. A speed-reducing transmission box is fixedly mounted at the top end of the first vertical seat, a driving motor is arranged on one side of the speed-reducing transmission box, a rotating shaft box is slidably connected to the top end of the second vertical seat, rotating shafts are arranged on the speed-reducing transmission box and the rotating shaft box, and the two rotating shafts are axially aligned; the end part of each rotating shaft is provided with a positioning mechanism; and the end surface of each positioning mechanism is provided with an axially concentric inner support positioning assembly. The positioning mechanism realizes the circumferential clamping force on the centralizer rib, and the positioning precision is improved. The profiling positioning groove in the end of the clamping plate is matched with the contour of the rib, the contact area is increased, the profiling notch in the end of the push plate is precisely attached to the edge of the rib, three-point clamping is formed in cooperation with the clamping plate, and the clamping stability is improved. The inner support positioning assembly adapts to different centralizer pipe diameters, and the supporting rigidity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of centralizer clamps, and in particular to a centralizer assembly welding clamp. Background Art

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

[0003] As a type of centralizer, the welded straight rib rigid centralizer adopts high-strength alloy steel as the matrix, with 3 or 6 ribs evenly distributed on the surface. The ribs and the matrix are connected with high strength by TIG welding or laser welding.

[0004] Existing welding processes often require operators to hold the ribs while welding. However, this method makes it difficult to ensure uniform circumferential distribution of the ribs, resulting in a decrease in the dynamic balance performance of the centralizer. Furthermore, the assembly and welding of individual pieces is time-consuming, reducing welding efficiency. Summary of the Invention

[0005] To address the problems of the prior art, the present invention proposes a centralizer assembly welding fixture that uses dual-station synchronous clamping and adaptive positioning to achieve rapid rib positioning. This is achieved through the following technical solutions: A centralizer assembly welding fixture includes a base, a first stand is provided at one end of the base, and a second stand is provided at the other end of the base; a reduction transmission box is fixedly installed on the top of the first stand, a drive motor is provided on one side of the reduction transmission box, and a rotating shaft box is slidably connected to the top of the second stand, the reduction transmission box and the rotating shaft box are both provided with rotating shafts, and the two groups of rotating shafts are kept axially aligned; a positioning mechanism is installed at the end of each rotating shaft, and an axially concentric internal support positioning assembly is installed on the end face of the positioning mechanism.

[0006] According to the above-mentioned centralizer assembly welding fixture, the positioning mechanism includes a positioning end seat, one end of the positioning end seat is provided with a central cavity, the internal support positioning assembly is installed in the central cavity, the other end of the positioning end seat is provided with a second shaft seat, and the end of the second shaft seat is provided with a first shaft seat fixedly connected to the rotating shaft; three groups of wide finger cylinders are evenly distributed on the circumference of the second shaft seat, and each of the two output ends of the wide finger cylinder is fixed with a connecting plate, and a splint is fixed on one side of the connecting plate; a support plate is fixed to the end of the first shaft seat, and three groups of first cylinders are evenly distributed on the circumference of one side of the support plate, and the output end of the first cylinder is provided with a mounting seat, and a push plate is fixed on one side of the mounting seat, and the push plate is located between the two groups of splints.

[0007] According to the above-mentioned centralizer assembly welding fixture, the end of the push plate is provided with a contoured notch, and one side of the end of the clamping plate is provided with a contoured positioning groove.

[0008] According to the above-mentioned centralizer assembly welding fixture, a guide hole is provided on the outer edge of the positioning end seat, a vertical plate is fixedly installed on the bottom end of the push plate, and a guide rod passing through the corresponding guide hole is fixed on one side of the vertical plate.

[0009] According to the above-mentioned centralizer assembly welding fixture, the internal support positioning assembly includes a cylinder and three groups of arc-shaped internal support plates. The three groups of arc-shaped internal support plates are distributed around the cylinder. The cylinder is fixedly connected to the central cavity through a flange provided at the end. A second cylinder is fixed inside the cylinder, and a center seat is fixed to the output end of the second cylinder. A second connecting rod is hinged to one end of the inner end surface of the arc-shaped internal support plate, and one end of the second connecting rod is hinged to the center seat. Two groups of first connecting rods are hinged to the other end of the inner end surface of the arc-shaped internal support plate, and one end of the two groups of first connecting rods is hinged to the cylinder.

[0010] According to the above-mentioned centralizer assembly welding fixture, the outer surface of the arc-shaped inner support plate is provided with anti-slip stripes.

[0011] According to the above-mentioned centralizer assembly welding fixture, a top plate is provided on the top of the second stand through multiple groups of support seats, two groups of slide rail assemblies are fixed on the top of the top plate, a support plate is installed between the two groups of slide rail assemblies, and the shaft box is installed on the top of the support plate.

[0012] According to the above-mentioned centralizer assembly welding fixture, a servo motor is fixed on one side of the second stand, a screw is installed on the top of the second stand, one end of the screw is fixedly connected to the output shaft of the servo motor through a coupling, a screw nut is provided on the screw, and the screw nut is fixed to the bottom end of the shaft box.

[0013] After adopting the above technical solution, the beneficial effects of the present invention are: The positioning mechanism provides circumferential clamping force on the centralizer ribs, improving positioning accuracy. Contoured positioning grooves on the ends of the clamping plates match the rib profile, increasing contact area. Contoured notches on the ends of the push plates precisely align with the rib edges, creating a three-point clamping mechanism with the clamping plates for enhanced clamping stability. The internal support positioning assembly adapts to different centralizer pipe diameters, increasing support stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the shaft box; Figure 3 This is a schematic diagram of the installation of the inner support positioning assembly; Figure 4 It is a structural diagram of the positioning mechanism; Figure 5 is a structural diagram of the rotating shaft; Figure 6 It is a structural diagram of the inner support positioning component; Figure 7 Schematic diagram of rib clamping; Figure 8 Schematic diagram of rib positioning.

[0016] Figure numbers: 1-base, 2-first stand, 3-reduction gear box, 4-drive motor, 5-positioning mechanism, 6-rotating shaft box, 7-second stand, 8-inner 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-rotating shaft, 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-vertical plate, 29-guide rod, 30-arc-shaped inner support plate, 31-first connecting rod, 32-cylinder, 33-second cylinder, 34-flange, 35-second connecting rod, 36-center seat, 37-profile notch, 38-profile positioning groove, 39-arc-shaped waist hole, 40-first locking bolt, 41-first positioning plate, 42-second positioning plate, 43-second locking bolt. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0018] The directional words appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0019] like Figure 1 As shown, an embodiment of the present invention provides a centralizer assembly welding fixture, which mainly includes a base 1, with a first stand 2 and a second stand 7 provided at both ends of the base 1. A reduction gear box 3 is fixedly installed on the top of the first stand 2, and a drive motor 4 is configured on one side of the reduction gear box 3. A rotating shaft box 6 is slidably connected to the top of the second stand 7. The reduction gear box 3 and the rotating shaft box 6 are both provided with a rotating shaft 19, and the two sets of rotating shafts 19 are kept axially aligned. A positioning mechanism 5 is installed at the end of each rotating shaft 19, and an inner support positioning assembly 8 concentric with its axial direction is installed on the end face of the positioning mechanism 5, forming a double-station synchronous clamping system.

[0020] like Figure 2 As shown, the top of the second stand 7 supports the top plate 9 through four groups of support seats 11 distributed in a rectangular shape. Two groups 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 groups 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 stand 7, and a lead screw 13 is installed at the top of the second stand 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 assembled on the lead screw 13, and the lead screw nut is fixed to the bottom end of the shaft box 6. When the servo motor 12 is working, the rotational motion is converted into linear motion through the lead screw nut, driving the shaft box 6 to move laterally along the slide rail assembly 10 to adapt to the different lengths of the stabilizer base.

[0021] like Figure 3 、 Figure 4 and Figure 7 As shown, the positioning mechanism 5 includes a positioning end seat 15. A central cavity 23 is defined at one end of the positioning end seat 15, and the internal support positioning assembly 8 is bolted to the central cavity 23. A second shaft seat 26 is defined at the other end of the positioning end seat 15. A first shaft seat 24 is provided at the end of the second shaft seat 26. The first shaft seat 24 is coaxially fixedly connected to the rotating shaft 19 via a threaded connection or a spline coupling.

[0022] Mounted on the outer cylindrical surface of the second shaft seat 26 are three sets of wide finger cylinders 25, evenly spaced around a 120° circle. Each wide finger cylinder 25 has a connecting plate 21 fixed to its two output ends, and a clamping plate 22 fixed to one side of the connecting plate 21. The wide finger cylinders 25 simultaneously pull the clamping plates 22 on either side toward each other, creating a symmetrical clamping force. This ensures balanced force on both sides of the centralizer ribs and prevents workpiece shifting. Contoured positioning grooves 38 matching the contour of the centralizer ribs are located on one side of the clamping plates 22, increasing the contact area and effectively preventing displacement caused by welding vibration.

[0023] A support plate 18 is fixed to the end of the first shaft seat 24. Three sets of first cylinders 20 are mounted on one side of the support plate 18, evenly spaced around a 120-degree circle. 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 positioned between two pairs of clamping plates 22. The first cylinders 20 drive the push plates 16 toward the center of the centralizer base. Contoured notches 37 on the push plates' ends precisely align with the edges of the centralizer ribs. These notches, in conjunction with contoured positioning grooves 38 on the clamping plates 22, form a three-point clamping structure, enhancing the stability and positioning accuracy of the centralizer ribs.

[0024] like Figure 5 As shown, the outer edge of the circumference of the positioning end seat 15 is provided with a guide hole 27, and the bottom end of the push plate 16 is fixedly mounted with a vertical plate 28, and a guide rod 29 is fixed to one side of the vertical plate 28. The guide rod 29 passes through the corresponding guide hole 27 and can effectively resist the lateral force during the movement and prevent the push plate 16 from swinging.

[0025] like Figure 6 As shown, the internal support positioning assembly 8 includes a cylindrical body 32 and three sets of curved internal support plates 30. The cylindrical body 32 is rigidly connected to the positioning end base 15 via flanges 34 at its ends. The three sets of curved internal support plates 30 are distributed around the outer circumference of the cylindrical body 32 at a 120° angle. The outer surfaces of the curved internal support plates 30 are provided with anti-slip stripes to increase friction and prevent spontaneous rotation of the centralizer base.

[0026] A second cylinder 33 is secured within the cylinder 32, with a center seat 36 secured to the output end of the second cylinder 33. A second connecting rod 35 is hingedly connected to the end of the inner surface of the curved inner support plate 30, away from the flange 34. The other end of the second connecting rod 35 is hingedly connected to the center seat 36. Two sets of first connecting rods 31 are hingedly connected to the end of the inner surface of the curved inner support plate 30, closer to the flange 34. The other ends of these two sets of first connecting rods 31 are hingedly connected to the cylinder 32. The second connecting rod 35 and the two sets of first connecting rods 31 are aligned axially along the cylinder 32.

[0027] like Figure 8As shown, a rib positioning assembly is further provided on the side of the positioning end seat 15 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 formed on the positioning end seat 15. A first locking bolt 40 passes through the arc-shaped waist hole 39 to secure the first positioning plate 41. A second locking bolt 43 passes through the arc-shaped waist hole 39 to secure the second positioning plate 42.

[0028] The following are the specific working principles and technical details of the centralizer assembly welding fixture.

[0029] The centralizer base is mounted on either inner support positioning assembly 8. The servo motor 12 is activated, driving the shaft housing 6 toward the reduction gearbox 3 to adjust the spacing between the positioning mechanisms 5 at both ends until the centralizer base is aligned with the positioning end seats 15. Simultaneously activating the second air cylinders 33 on both sides pushes the center seat 36 axially, causing the three sets of curved inner support plates 30 to undergo synchronous radial expansion, thus aligning them with the inner wall of the centralizer base, achieving precise positioning and clamping of the centralizer base.

[0030] The required centralizer ribs are fed to the underside of the clamped centralizer base by an external loading device (not shown). The wide finger cylinders 25 on either side of the centralizer rib simultaneously pull the clamping plates 22 toward each other, creating a symmetrical clamping force. Simultaneously, the first cylinders 20 on either side of the centralizer rib drive the push plates 16 toward the center of the centralizer base, clamping and positioning the centralizer rib.

[0031] Then, the drive motor 4 is started, driving the centralizer base and the centralizer ribs on it to rotate 120 degrees. The loading device delivers the next required centralizer rib to the bottom of the centralizer base until all ribs are assembled. Afterwards, it is sent to the welding station.

[0032] If the centralizer has six sets of ribs, welding is performed after three sets are assembled. Once welding is complete, loosen the first and second locking bolts 40, 43, and adjust the positions of the first and second positioning plates 41, 42. Select any assembled centralizer rib and place the first and second positioning plates 41, 42 on either side of the rib. Tighten the first and second locking bolts 40, 43 to secure the rib. The clamping position of the positioning mechanism 5 is reset, and the rib loading process is repeated to complete the clamping of the remaining three sets of centralizer ribs.

[0033] While the embodiments of the present invention are described above, these embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to make good use of the present invention and its modifications and uses. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A centralizer assembly welding fixture, characterized by: The invention comprises a base (1), wherein one end of the base (1) is provided with a first stand (2), and the other end of the base (1) is provided with a second stand (7); a reduction gear box (3) is fixedly installed on the top of the first stand (2), a driving motor (4) is provided on one side of the reduction gear box (3), and a rotating shaft box (6) is slidably connected to the top of the second stand (7), and the reduction gear box (3) and the rotating shaft box (6) are both provided with a rotating shaft (19), and the two groups of the rotating shafts (19) are kept axially aligned; a positioning mechanism (5) is installed at the end of each rotating shaft (19), and an axially concentric inner support positioning assembly (8) is installed on the end face of the positioning mechanism (5); 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), and the inner support positioning assembly (8) is provided with a central cavity (23). The component (8) is installed in the central cavity (23), and 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) fixedly connected to the rotating shaft (19); the second shaft seat (26) is provided with three groups of wide finger cylinders (25), and each of the two output ends of the wide finger cylinder (25) is fixed with a connecting plate (21), and a clamping plate (22) is fixed on one side of the connecting plate (21); the end of the first shaft seat (24) is fixed with a support plate (18), and three groups of first cylinders (20) are provided on one side of the support plate (18), and the output end of the first cylinder (20) is provided with a mounting seat (17), and a push plate (16) is fixed on one side of the mounting seat (17), and the push plate (16) is located between the two groups of clamping plates (22).

2. The centralizer assembly welding fixture according to claim 1, characterized in that: The end of the push plate (16) is provided with a contoured notch (37), and one side of the end of the clamping plate (22) is provided with a contoured positioning groove (38).

3. The centralizer assembly welding fixture according to claim 1, characterized in that: A guide hole (27) is provided on the outer edge of the positioning end seat (15), a vertical plate (28) is fixedly mounted on the bottom end of the push plate (16), and a guide rod (29) penetrating the corresponding guide hole (27) is fixed on one side of the vertical plate (28).

4. The centralizer assembly welding fixture according to claim 1, characterized in that: The inner support positioning assembly (8) includes a cylinder (32) and three groups of arc-shaped inner support plates (30), the three groups of arc-shaped inner support plates (30) are distributed around the cylinder (32), the cylinder (32) is fixedly connected to the central cavity (23) through a flange (34) provided at the end, a second cylinder (33) is fixed inside the cylinder (32), a center seat (36) is fixed at the output end of the second cylinder (33), a second connecting rod (35) is hinged at one end of the inner end surface of the arc-shaped inner support plate (30), one end of the second connecting rod (35) is hinged to the center seat (36), and two groups of first connecting rods (31) are hinged at the other end of the inner end surface of the arc-shaped inner support plate (30), one end of the two groups of first connecting rods (31) are hinged to the cylinder (32).

5. The centralizer assembly welding fixture according to claim 4, characterized in that: The outer surface of the arc-shaped inner support plate (30) is provided with anti-slip stripes.

6. The centralizer assembly welding fixture according to claim 1, characterized in that: A top plate (9) is mounted on the top of the second stand (7) via multiple sets of support seats (11), two sets of slide rail assemblies (10) are fixed to the top of the top plate (9), a support plate (14) is installed between the two sets of slide rail assemblies (10), and the shaft box (6) is installed on the top of the support plate (14).

7. The centralizer assembly welding fixture according to claim 6, characterized in that: A servo motor (12) is fixed on one side of the second stand (7), a lead screw (13) is installed on the top of the second stand (7), one end of the lead screw (13) is fixedly connected to the output shaft of the servo motor (12) through a coupling, and a lead screw nut is provided on the lead screw (13), and the lead screw nut is fixed to the bottom end of the shaft box (6).

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