Swing type double-jaw plate tong head applied to back-up tong
Through the swinging double jaw plate structure and safety pin design, the eccentricity and unstable force during the clamping of traditional back clamps are solved, and uniform clamping and stable release of the oil well pipe string is achieved, improving the safety and durability of the equipment.
Patent Information
- Application Number
- CN202422589799.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The single jaw structure of traditional back clamps is prone to eccentricity during clamping, which leads to uneven stress on the pipe string, increasing the risk of damage, and unstable clamping force, affecting the stability and durability of the equipment, especially when dealing with pipe strings with large diameter changes.
The swinging double jaw plate structure is adopted, and the swinging jaw plate assembly is driven by the clamping liquid cylinder to achieve uniform clamping and stable release, and a safety pin structure is introduced to fix the jaw plate frame assembly to prevent accidental movement in non-working states.
It effectively avoids eccentricity, reduces the risk of column damage, improves the safety and durability of the equipment, and ensures the stability and uniformity of clamping force.
Smart Images
Figure CN223241383U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oilfield casing, in particular to a swing type double-jaw plate tong head used for a back-up tong. Background Art
[0002] In the fields of oil extraction, processing, and related industries, backup tongs are an important tool and are widely used in the loading and unloading operations of oil well tubing. Traditional backup tong designs mostly use a single jaw plate structure, which is driven by hydraulic or mechanical means to achieve the clamping and release of the oil well tubing. However, with the increasing complexity of the oilfield operating environment and the improvement of the requirements for operating efficiency, traditional backup tongs have gradually exposed some problems. For example, the single jaw plate structure is prone to deviation during the clamping process, resulting in uneven force on the tubing and increasing the risk of tubing damage. This problem is particularly prominent when handling tubing with large diameter variations. Secondly, the clamping force of traditional backup tongs is often affected by factors such as hydraulic fluctuations or mechanical wear, making it difficult to maintain a constant force, thereby affecting the stability and durability of the equipment. Utility Model Content
[0003] The utility model provides a swing type double jaw tong head applied to a backup tong, which aims to solve the shortcomings of the prior art, effectively avoid the occurrence of eccentricity, and reduce the risk of pipe column damage.
[0004] The technical solution of the utility model for solving the above problems is: a swinging double-jaw plier head applied to a back plier, characterized in that: it comprises a back plier main body and a jaw plate frame, the jaw plate frame is rotatably connected to the back plier main body, the jaw plate frame comprises an upper jaw plate frame and a lower jaw plate frame, the upper jaw plate frame and the lower jaw plate frame are fixedly connected by a support shaft, a safety pin is provided between the jaw plate frame and the back plier main body, the inner sides of the upper jaw plate frame and the lower jaw plate frame are respectively fixed with a slope plate body, and two groups of swing jaw assemblies are symmetrically arranged between the upper and lower slope plate bodies; a bracket is also provided on the side of the back plier main body away from the jaw plate frame, a clamping cylinder is provided between the bracket and the jaw plate frame, the cylinder of the clamping cylinder is rotatably connected to the bracket, and the piston rod of the clamping cylinder is rotatably connected to the support shaft fixed on the jaw plate frame through a single earring.
[0005] Preferably, the swing jaw assembly includes jaw teeth, a jaw plate, and a jaw plate shaft. The jaw plate is rotatably connected to the upper and lower ramp plates respectively through the jaw plate shaft, and jaw teeth are fixedly provided on the inner side of the jaw plate.
[0006] Preferably, the swing jaw assembly is provided with two sets of jaw shafts.
[0007] Preferably, the clamping cylinder is driven to extend and retract by a hydraulic system.
[0008] Preferably, the safety pin includes a shackle, a stud, a locking bolt, a pin body, and a threaded surface. The pin body is fastened together by the stud and the locking bolt. Two groups of locking bolts are provided. The shackle is rotatably connected to the stud fixed on the pin body, and the tail of the pin body is processed with a threaded surface.
[0009] Preferably, holes are respectively provided on the upper jaw plate frame, the lower jaw plate frame and the back clamp body, and the holes are aligned. The safety pin can be inserted into the hole and threadedly connected to the nut through the threaded surface.
[0010] Preferably, the upper jaw plate frame is provided with a through hole, a fixed bearing ring is provided between the upper jaw plate frame and the lower jaw plate frame, a threaded hole is provided in the fixed bearing ring, and the safety pin can pass through the through hole and be screwed into the threaded hole of the fixed bearing ring.
[0011] Furthermore, the tail of the pin body of the safety pin is processed with four sets of threaded surfaces.
[0012] The utility model is beneficial in that:
[0013] This utility model utilizes a swinging double-jaw structure, achieving uniform clamping and stable release of the oil well tubing, effectively preventing eccentricity and reducing the risk of tubing damage. Furthermore, the introduction of a safety pin effectively secures the jaw frame assembly when the swinging double-jaw pliers are not in operation or during maintenance, preventing accidental movement or rotation and enhancing equipment safety. The locking action of the safety pin reduces unnecessary movement of the jaw frame assembly when not in operation, increasing equipment durability. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional view of the structure of the utility model;
[0015] Figure 2 This is a top view of the structure of the utility model;
[0016] Figure 3 This is a structural diagram of a first embodiment of the safety pin of the utility model;
[0017] Figure 4 This is a structural diagram of a second embodiment of the safety pin of the present invention;
[0018] In the figure: 1. Single earring; 2. Back-up jaw body; 3. Jaw plate frame; 31. Support shaft; 32. Upper jaw plate frame; 33. Lower jaw plate frame; 34. Through hole; 4. Swinging jaw assembly; 41. Slope plate body; 42. Jaw teeth; 43. Jaw plate; 44. Jaw plate shaft; 5. Safety pin; 51. Hook; 52 Stud; 53. Locking bolt; 54. Pin body; 55. Threaded surface; 6. Clamping cylinder; 61. Piston rod; 62. Cylinder; 7. Bracket; 8. Fixed load ring; 81. Threaded hole; 9. Hole; 10. Nut. DETAILED DESCRIPTION
[0019] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.
[0020] like Figures 1 to 4 The back tongs 2 are provided with a bracket 7 on one side of the back tongs 2 and a bracket 7 on the other side of the back tongs 2. A clamping cylinder 6 is provided between the bracket 7 and the jaw frame 3. The clamping cylinder 62 is rotatably connected to the bracket 7. The piston rod 61 of the clamping cylinder 6 is rotatably connected to the bracket 7 and the support shaft 31 fixed to the jaw frame 3.
[0021] Preferably, the swing jaw assembly 4 includes a jaw tooth 42 , a jaw plate 43 , and a jaw plate shaft 44 . The jaw plate 43 is rotatably connected to the upper and lower ramp plates 41 through the jaw plate shaft 44 , and a jaw tooth 42 is fixedly provided on the inner side of the jaw plate 43 .
[0022] Preferably, the swing jaw assembly 4 is provided with two sets of jaw shafts 44 .
[0023] Preferably, the clamping cylinder 6 is driven to extend and retract by a hydraulic system.
[0024] The working process of the above-mentioned swinging double-jaw pliers head applied to the back-up tongs is as follows: pull out the safety pin 5, start the hydraulic system, and the piston rod 61 of the clamping cylinder 6 contracts, thereby driving the swinging jaw assembly 4 to move; the roller on the swinging jaw assembly 4 climbs along the curve of the inner arc surface of the ramp plate body 41, so that the inner teeth 42 of the jaw plate 43 clamp the pipe column to complete the clamping action; then reverse the operation to make the clamping cylinder 6 move and drive the jaw plate 43 to rotate in the opposite direction, the roller retreats, the jaw plate 43 releases the pipe column, and at the same time the jaw plate frame 3 is aligned with the notch of the ramp plate body 41, and finally the safety pin 5 is inserted to stop working.
[0025] Figure 3 This is the first embodiment of the safety pin 5. The safety pin 5 includes a shackle 51, a stud 52, a locking bolt 53, a pin body 54, and a threaded surface 55. The pin body 54 is fastened together by the stud 52 and the locking bolt 53. There are two groups of locking bolts 53. The shackle 51 is rotatably connected to the stud 52 fixed on the pin body 54. The shackle 51 facilitates the removal and rotation of the safety pin. The tail of the pin body 54 is processed with a threaded surface 55.
[0026] The upper jaw plate frame 32 , the lower jaw plate frame 33 and the back-up clamp body 2 are respectively provided with holes 9 , which are aligned. The safety pin 5 can be inserted into the hole 9 and threadedly connected to the nut 10 through the threaded surface 55 .
[0027] In one embodiment, the tail of the pin body 54 of the safety pin 5 is processed with four sets of threaded surfaces 55. Compared with the threaded structure of a traditional bolt, the four sets of threaded surfaces 55 reduce the contact area with the nut, thereby reducing friction and lowering the probability of locking.
[0028] Figure 4 This is the second embodiment of the safety pin 5, which is different from the first embodiment in that: the nut 10 is not provided, the upper jaw plate frame 32 is provided with a through hole 34, a fixed load-bearing ring 8 is provided between the upper jaw plate frame 32 and the lower jaw plate frame 33, and a threaded hole 81 is provided in the fixed load-bearing ring 8. The safety pin 5 can pass through the through hole 34 and be screwed into the threaded hole 81 of the fixed load-bearing ring 8.
Claims
1. A swing-type double-jaw pliers head for back-up pliers, characterized by: The invention comprises a back-up tong body (2) and a jaw plate frame (3), wherein the jaw plate frame (3) is rotatably connected to the back-up tong body (2), the jaw plate frame (3) comprises an upper jaw plate frame (32) and a lower jaw plate frame (33), the upper jaw plate frame (32) and the lower jaw plate frame (33) are fixedly connected via a support shaft (31), a safety pin (5) is provided between the jaw plate frame (3) and the back-up tong body, and a slope plate body (41) is fixedly provided on the inner side of each of the upper jaw plate frame (32) and the lower jaw plate frame (33). Two groups of swing jaw plate assemblies (4) are symmetrically arranged between the upper and lower ramp plates (41); a bracket (7) is further arranged on the side of the back clamp body (2) away from the jaw plate frame (3); a clamping liquid cylinder (6) is arranged between the bracket (7) and the jaw plate frame (3); a liquid cylinder (62) of the clamping liquid cylinder (6) is rotatably connected to the bracket (7); and a piston rod (61) of the clamping liquid cylinder (6) is rotatably connected to a support shaft (31) fixed on the jaw plate frame (3) through a single earring (1).
2. The swing type double jaw pliers head used for back-up pliers according to claim 1, characterized in that: The swing jaw assembly (4) comprises a jaw tooth (42), a jaw plate (43), and a jaw plate shaft (44). The jaw plate (43) is rotatably connected to the upper and lower ramp plates (41) respectively through the jaw plate shaft (44). The jaw tooth (42) is fixedly provided on the inner side of the jaw plate (43).
3. The swing type double jaw pliers head used for back-up pliers according to claim 2, characterized in that: The swing jaw assembly (4) is provided with two groups of jaw shafts (44).
4. The swing type double jaw pliers head used for back-up pliers according to claim 1, characterized in that: The clamping cylinder (6) is driven to extend and retract by a hydraulic system.
5. The swing type double jaw pliers head used for back-up pliers according to claim 1, characterized in that: The safety pin (5) comprises a shackle (51), a stud (52), a locking bolt (53), a pin body (54), and a threaded surface (55). The pin body (54) is fastened together by the stud (52) and the locking bolt (53). Two groups of locking bolts (53) are provided. The shackle (51) is rotatably connected to the stud (52) fixed on the pin body (54). The tail of the pin body (54) is processed with a threaded surface (55).
6. The swing type double jaw pliers head used for back-up pliers according to claim 5, characterized in that: The upper jaw plate frame (32), the lower jaw plate frame (33) and the back clamp body (2) are respectively provided with holes (9), and the holes (9) are aligned. The safety pin (5) can be inserted into the hole (9) and threadedly connected with the nut (10) through the threaded surface (55).
7. The swing type double jaw pliers head used for back-up pliers according to claim 5, characterized in that: The upper jaw plate frame (32) is provided with a through hole (34), a fixed bearing ring (8) is provided between the upper jaw plate frame (32) and the lower jaw plate frame (33), a threaded hole (81) is provided in the fixed bearing ring (8), and the safety pin (5) can pass through the through hole (34) and be screwed into the threaded hole (81) of the fixed bearing ring (8).
8. The swing type double jaw pliers head used for back-up pliers according to claim 6, characterized in that: The tail of the pin body 54 of the safety pin (5) is processed with four groups of threaded surfaces (55).