Swing arm type tong head reversing mechanism of iron roughneck

Abstract

The invention relates to the technical field of oil field wellhead equipment, in particular to a swing arm type tong head reversing mechanism of an iron roughneck, which comprises a reversing device clamped on a tong head, a swing arm device is arranged on one side of the reversing device, and the reversing device comprises a bolt shell and a cover plate fixedly mounted at the top of the bolt shell. A T-shaped shifting rod is rotationally installed in the bolt shell, a shifting rod shaft penetrates through the center of the interior of the T-shaped shifting rod, bolts are connected to the two ends of the T-shaped shifting rod, bolt shafts penetrate through the positions between the bolts and the T-shaped shifting rod, and the bolt on one side of the tong head is located at the pressing position at the beginning, and the bolt on the other side of the tong head is located at the lifting position at the beginning. The swing arm drives the rotating seat on the mounting seat to rotate, the swing arm rod on the rotating seat drives the T-shaped shifting rod to swing, the two bolts exchange pressing positions, and the bolts at the pressing positions can slide in the arc groove of the tong head main body, so that the screwing-on and screwing-off directions can be controlled.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield wellhead equipment, in particular to a swing-arm type tongs reversing mechanism for an iron roughneck. Background Art

[0002] In oilfield wellhead operations, power tongs are commonly used threaded connection tools for tubular equipment. A stop pin is set on the tong head rotating body, and a reset shaft is set on the tong body. The reset shaft head has an arc-shaped groove that accommodates the stop pin. When the stop pin enters the arc-shaped groove of the reset shaft, it is exactly the original position of the tong head rotating body. To switch between making and breaking the buckle, you only need to rotate the reset shaft 180 degrees so that the direction of the arc-shaped groove is opposite to the previous direction, so that the stop pin can rotate in the opposite direction to achieve the switch between making and breaking the buckle. The second method is to use a pin-type reversing mechanism to change the position of the replacement pin to achieve the change of the making and breaking direction, but this structure requires manual insertion and removal of the pin, which is time-consuming and labor-intensive, with low production efficiency, and cannot meet the needs in remote or automatic operation environments. The third method is that some iron drillers use two cylinders or air cylinders to press or push and pull the reversing pin shaft at the making and breaking position to achieve reversing, but this mechanism uses multiple cylinders, which increases the difficulty of control.

[0003] In the prior art, the patent with announcement number CN101358511A discloses a power tongs lever-type tongs head steering mechanism, including a positioning stop pin housing, a buckle direction stop pin, a buckle detachment direction stop pin, a ramp plate, a screw, a jaw plate frame, a tooth block, a jaw plate, a jaw plate roller, a roller shaft, a brake band, a brake connecting plate, an open gear cover, an open gear, a pinion, a pinion shaft, and a countersunk screw. Two stop pins are respectively provided corresponding to the two arc grooves on the open gear cover. The two stop pins are connected by a pinion, and each stop pin is provided with teeth to cooperate with the connected pinion.

[0004] The above structure realizes the clamp head steering mechanism through the lever principle, but during the reversing process, the operation steps are cumbersome and the internal structure is easily stuck during the reversing, resulting in low reversing efficiency. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a swing-arm tong head reversing mechanism for iron roughnecks to solve the problems of cumbersome operating steps, easy jamming of the internal structure during reversing, and low reversing efficiency during reversing, so as to make the power tong operation simpler and more efficient.

[0006] Based on the above purpose, the present invention provides a swing-arm type tong head reversing mechanism for an iron roughneck, comprising a reversing device clamped on the tong head, a swing-arm device provided on one side of the reversing device, and the swing-arm device being used to drive the reversing device to perform reversing of making and breaking out the hook; The arm swinging device includes a mounting base, a connecting base is fixedly mounted on the top of the mounting base, an arm swinging drive is provided inside the connecting base, an output end of the arm swinging drive is fixedly connected to a rotating base, and an arm swinging rod is fixedly mounted on the outside of the rotating base; The reversing device includes a latch housing and a cover plate fixedly mounted on the top of the latch housing, and a T-shaped lever is rotatably mounted inside the latch housing, a lever shaft passes through the center of the T-shaped lever, both ends of the T-shaped lever are connected to latches, a latch shaft passes between the latch and the T-shaped lever, and the bottom ends of the two groups of latches pass through the bottom end of the latch housing and extend into the pliers head.

[0007] Preferably, positioning ring grooves are equidistantly provided on both sides of the exterior of the two groups of latches, a limiting ball is slidably installed inside the latch housing, and a limiting top screw is provided on one side of the limiting ball, and a limiting spring is connected between the limiting top screw and the limiting ball.

[0008] Preferably, the limiting ball is arranged inside the latch housing in a mirror-symmetrical manner, and the radius of the limiting ball matches the radius of the positioning ring groove.

[0009] Preferably, at least two groups of positioning ring grooves are provided, and the positioning ring grooves correspond to the limiting balls.

[0010] Preferably, a top screw is provided on the latch shaft, and the top screw is installed inside the latch.

[0011] Preferably, the swing arm drive is one of a pneumatic motor, a rotary cylinder, a hydraulic motor or an electric motor.

[0012] Beneficial effects of the present invention: Initially, one pin on one side of the clamp head is in the downward position, and the other pin is in the upward position. In the swing arm device, the swing arm drive drives the rotating seat on the mounting seat to rotate, and the swing arm rod on the rotating seat drives the T-shaped lever to swing, and the two pins exchange the downward position. The pin in the downward position can slide in the arc groove of the clamp head body, thereby realizing the control of the direction of fastening and breaking the buckle; Different from traditional manual reversing or reversing by pressing oil cylinder or air cylinder, it is more efficient and simpler to reverse. It can allow the center of the swing arm device and the reversing device to be not on the same line. Therefore, after long-term use of the equipment, a certain degree of wear or dislocation is allowed to ensure perfect reversing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or 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 for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a schematic diagram of the overall top view of the present invention; Figure 2 This is a schematic diagram of the internal front view of the latch housing of the present invention; Figure 3 It is a side view structural diagram of the present invention as a whole.

[0015] The markings in the figure are: 1. Arm swinging device; 11. Arm swinging rod; 12. Rotating seat; 13. Connecting seat; 14. Mounting seat; 15. Arm swinging drive; 2. Reversing device; 21. T-type lever; 22. Latch; 23. Top screw; 24. Latch shaft; 25. Lever shaft; 26. Clamp head; 27. Limit ball; 28. Limit spring; 29. ​​Limit top screw; 210. Latch housing; 211. Cover plate; 212. Positioning ring groove. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0017] like Figure 1 、 Figure 2 、 Figure 3 As shown, a swing-arm type tongs head reversing mechanism for an iron roughneck includes a reversing device 2 clamped on a tongs head 26, and a swing-arm device 1 is provided on one side of the reversing device 2. The swing-arm device 1 is used to drive the reversing device 2 to perform reversing of the make-up and break-out. The arm swinging device 1 includes a mounting base 14, a connecting base 13 is fixedly mounted on the top of the mounting base 14, an arm swinging drive 15 is provided inside the connecting base 13, an output end of the arm swinging drive 15 is fixedly connected to a rotating base 12, the rotating base 12 is rotatably mounted on the top of the connecting base 13, and an arm swinging rod 11 is fixedly mounted on the outside of the rotating base 12; The reversing device 2 includes a latch housing 210 and a cover plate 211 fixedly mounted on the top of the latch housing 210. A T-shaped lever 21 is rotatably mounted inside the latch housing 210. A lever shaft 25 passes through the center of the T-shaped lever 21. Both ends of the T-shaped lever 21 are connected to latches 22. A latch shaft 24 passes between the latches 22 and the T-shaped lever 21. The bottom ends of the two sets of latches 22 pass through the bottom end of the latch housing 210 and extend into the clamp head 26. A locking mechanism 3 is provided between the latch 22 and the latch housing 210 , and the locking mechanism 3 is used to lock the latch 22 after the reversal.

[0018] In this embodiment, the latches 22 on one side of the clamp head 26 are initially in the pressing position, and one group is in the lifting position. In the swing arm device 1, the swing arm drive 15 drives the rotating seat 12 on the mounting seat 14 to rotate, and the swing arm rod 11 on the rotating seat 12 drives the T-shaped lever 21 to swing, and the two latches 22 exchange the pressing position. The latch 22 in the pressing position can slide in the arc groove of the clamp head 26 body, thereby realizing the control of the buckle making and breaking direction; By rotating the swing arm device 1 by a certain angle and toggling the T-shaped lever 21 during the rotation, the reversing of the make-up and break-out can be achieved. This allows the centers of the swing arm device 1 and the reversing device 2 to be not on the same line. Therefore, after long-term use of the equipment, a certain degree of wear or misalignment can be allowed to ensure perfect reversing.

[0019] As an implementation method, Figure 1 、 Figure 2 As shown, positioning ring grooves 212 are equidistantly provided on both sides of the exterior of the two groups of latches 22, a limiting ball 27 is slidably installed inside the latch housing 210, and a limiting top screw 29 is provided on one side of the limiting ball 27, and a limiting spring 28 is connected between the limiting top screw 29 and the limiting ball 27.

[0020] In this embodiment, the latch 22 is installed in the slide groove of the latch housing 210, and the upper ends of the two latches 22 are connected to the two ends of the T-shaped lever 21 through the latch shaft 24 respectively. The T-shaped lever 21 swings left and right, allowing the two latches 22 to extend and retract alternately to achieve the reversal of the buckle. When the buckle latch 22 needs to be buckled or the buckle latch 22 needs to be detached, the limiting ball 27 fixes the latch 22 under the push of the limiting spring 28 to prevent the pliers head 26 from sliding during movement.

[0021] As an implementation method, Figure 1 、 Figure 2 As shown, the limiting ball 27 is arranged in a mirror-symmetrical manner inside the latch housing 210, and the limiting ball 27 corresponds to the positioning ring groove 212. There are at least two groups of positioning ring grooves 212 , and the radius of the positioning ring grooves 212 matches the radius of the limiting balls 27 .

[0022] In this embodiment, the limiting ball 27 is clamped in the positioning ring groove 212 of the latch 22 under the action of the limiting spring 28, ensuring that the latch 22 does not move up and down during the rotation of the entire pliers head 26.

[0023] As an implementation method, Figure 1 、 Figure 2 As shown, a top screw 23 is provided on the latch shaft 24 , and the top screw 23 is installed inside the latch 22 .

[0024] In this embodiment, the top screw 23 is used to axially fix the latch shaft 24, and the shaft is supported by rotation to prevent the shaft and the sleeve from moving relative to each other during use.

[0025] As an implementation method, Figure 1 、 Figure 2 and Figure 3 As shown, the arm swinging drive 15 is one of a pneumatic motor, a rotary cylinder, a hydraulic motor or an electric motor.

[0026] This embodiment is controlled by pneumatic, hydraulic or electric means, has a stable and reliable structure, does not require manual work to change the direction of making and breaking the buckle, and improves production efficiency.

[0027] Working principle: When in use, the pins 22 on one side of the clamp head 26 are initially in the pressing position, and one group is in the lifting position. In the swing arm device 1, the swing arm drive 15 drives the rotating seat 12 on the mounting seat 14 to rotate, and the swing arm rod 11 on the rotating seat 12 drives the T-shaped lever 21 to swing. After the T-shaped lever 21 swings to the other side, it drives the pin 22 in the pressing position upward and the pin 22 in the lifting position downward. The two pins 22 exchange the pressing position, and the pin 22 in the pressing position can slide in the arc groove of the clamp head 26 body, thereby realizing the control of the direction of making and breaking the buckle; At the same time, when the latch 22 is alternately extended and retracted up and down, the limiting ball 27 inside the latch housing 210 is pushed by the limiting spring 28 to fix the two sets of latches 22. The limiting ball 27 is stuck in the positioning ring groove 212 of the latch 22 under the action of the limiting spring 28, ensuring that the latch 22 will not move up and down during the rotation of the entire pliers head 26; By rotating the swing arm device 1 by a certain angle and toggling the T-shaped lever 21 during the rotation, the reversing of the make-up and break-out can be achieved. This allows the centers of the swing arm device 1 and the reversing device 2 to be not on the same line. Therefore, after long-term use of the equipment, a certain degree of wear or misalignment can be allowed to ensure perfect reversing.

[0028] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0029] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A swing-arm type tongs reversing mechanism for an iron roughneck, comprising a reversing device (2) clamped on a tongs head (26), characterized in that: An arm swinging device (1) is provided on one side of the reversing device (2), and the arm swinging device (1) is used to drive the reversing device (2) to perform reversing of the make-up and break-out. The arm swinging device (1) comprises a mounting seat (14), a connecting seat (13) is fixedly mounted on the top of the mounting seat (14), an arm swinging drive (15) is provided inside the connecting seat (13), an output end of the arm swinging drive (15) is fixedly connected to a rotating seat (12), and an arm swinging rod (11) is fixedly mounted on the outside of the rotating seat (12); The reversing device (2) comprises a latch housing (210) and a cover plate (211) fixedly mounted on the top of the latch housing (210), and a T-shaped shifting rod (21) is rotatably mounted inside the latch housing (210), a shifting rod shaft (25) passes through the center of the T-shaped shifting rod (21), both ends of the T-shaped shifting rod (21) are connected to latches (22), a latch shaft (24) passes through between the latches (22) and the T-shaped shifting rod (21), and the bottom ends of the two groups of latches (22) pass through the bottom end of the latch housing (210) and extend into the clamp head (26).

2. The swing-arm type tongs reversing mechanism for an iron roughneck according to claim 1, characterized in that: Positioning ring grooves (212) are equidistantly provided on both sides of the exterior of the two groups of latches (22), a limiting ball (27) is slidably mounted inside the latch housing (210), and a limiting top screw (29) is provided on one side of the limiting ball (27), and a limiting spring (28) is connected between the limiting top screw (29) and the limiting ball (27).

3. The swing-arm type tongs reversing mechanism for an iron roughneck according to claim 2, characterized in that: The limiting ball (27) is arranged in a mirror-symmetrical manner inside the latch housing (210), and the limiting ball (27) corresponds to the positioning ring groove (212).

4. The swing-arm type tongs reversing mechanism for an iron roughneck according to claim 3, characterized in that: At least two groups of positioning ring grooves (21) are provided, and the radius of the positioning ring grooves (212) matches the radius of the limiting ball (27).

5. The swing-arm type tongs reversing mechanism for an iron roughneck according to claim 1, characterized in that: A top screw (23) is provided on the latch shaft (24), and the top screw (23) is installed inside the latch (22).

6. The swing-arm type tongs reversing mechanism for an iron roughneck according to claim 1, characterized in that: The arm swing drive (15) is one of a pneumatic motor, a rotary cylinder, a hydraulic motor or an electric motor.

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