A back-up wrench assembly applied to a top drive

Abstract

The utility model discloses a back wrench assembly for top drive, including connector mechanism, fixed in the telescopic torsion arm mechanism of connector mechanism, fixed in the telescopic torsion arm mechanism of back wrench body mechanism and be located between the adjusting mechanism of telescopic torsion arm mechanism and back wrench body mechanism, through the operation adjusting mechanism can adjust the length of telescopic torsion arm mechanism to realize the adjustment of back wrench body mechanism position. The utility model simple structure, low in manufacturing cost, convenient to use and practicality are strong, when the protection joint of new thread is replaced and processed, through the operation adjusting mechanism can adjust the length of telescopic torsion arm mechanism to realize the adjustment of back wrench body mechanism position, and then can make the position of back wrench body mechanism and the protection joint of short length after adaptation, therefore the protection joint of thread wear seriously can still be repeatedly used after the new thread of reprocessing, can effectively reduce the use cost of later period. The utility model is suitable for installing on top drive and using.

Description

Technical Field

[0001] This utility model relates to a back clamp assembly, specifically a back clamp assembly applied to a top drive. Background Technology

[0002] Top drive drilling rigs, also known as top drives, are modern, high-efficiency drilling power equipment. Protective couplings and back tongs assemblies are important components of top drives. One end of the protective coupling is connected to the top drive spindle, while the other end is used for frequent connection and disconnection of the drill pipe. Its core function is to protect the threads of the top drive spindle, which are difficult to replace and expensive, through its own wear. The back tong assembly includes a torque arm mechanism and a back tong body mechanism fixed to the torque arm mechanism. Its core function is for uncoupling and reconnecting drill pipe during drilling.

[0003] Protective connectors are consumable parts with high costs. When the threads on the protective connector are severely worn, it needs to be replaced. Replacing the entire protective connector increases the long-term operating costs of the top drive. To reduce these costs, a possible method is to re-machine new threads onto the worn protective connector. This method extends the service life of the protective connector and effectively reduces long-term operating costs. However, the re-machined protective connector will be shorter. In the existing back clamp assembly, the torque arm mechanism is a single unit, and the position of the back clamp body cannot be adjusted. The existing back clamp assembly cannot accommodate the shortened protective connector. Therefore, a back clamp assembly that can accommodate the shortened protective connector needs to be developed. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a back clamp assembly for top drives, which can be adapted to the shortened protection connector, thereby reducing the cost of later use.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a back clamp assembly applied to a top drive, including a connector mechanism, a telescopic torque arm mechanism fixed on the connector mechanism, a back clamp body mechanism fixed on the telescopic torque arm mechanism, and an adjustment mechanism disposed between the telescopic torque arm mechanism and the back clamp body mechanism. By operating the adjustment mechanism, the length of the telescopic torque arm mechanism can be adjusted to achieve the adjustment of the position of the back clamp body mechanism.

[0006] As a limitation of this utility model, the telescopic torque arm mechanism includes an outer torque arm fixedly mounted on the lower end of the connector mechanism and an inner torque arm slidably connected within the outer torque arm; the outer torque arm has multiple sets of outer torque arm positioning holes, and the inner torque arm has two sets of inner torque arm positioning holes; two positioning bolts are respectively inserted into the aligned outer torque arm positioning holes and inner torque arm positioning holes, and two positioning nuts are used to fix the outer torque arm and inner torque arm together; the back clamp body mechanism is fixedly mounted on the inner torque arm.

[0007] As a further limitation of this utility model, the external torsion arm includes an outer tube component, a reinforcing tube component fixed to the lower end of the outer tube component, and an upper connecting lug fixed to the outer wall of the reinforcing tube component.

[0008] As a further definition of this utility model, the back clamp body mechanism includes a back clamp body and a lower connecting ear fixed on the outer side wall of the back clamp body.

[0009] As a further limitation of this utility model, an upper shackle is provided on the upper connecting ear, and a lower shackle is provided on the lower connecting ear.

[0010] As another limitation of this utility model, the adjustment mechanism adopts a ratchet tensioner.

[0011] As a further limitation of this utility model, the ratchet tensioner includes a ratchet tensioner body and an operating handle detachably connected to the ratchet tensioner body.

[0012] As a further definition of this utility model, the connector mechanism includes a connector block and two connectors fixedly mounted on the connector block.

[0013] As a further limitation of this utility model, the connecting block and the upper end of the telescopic torque arm mechanism are fixedly connected together by two fixing bolts and two fixing nuts.

[0014] As a further limitation of this utility model, the distance between two adjacent sets of external torque arm positioning holes in the plurality of sets of external torque arm positioning holes is 50mm, and the distance between two sets of internal torque arm positioning holes is 50mm.

[0015] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows: (1) This utility model adopts a structure combining a connector mechanism, a telescopic torque arm mechanism, a back clamp body mechanism and an adjustment mechanism. The length of the telescopic torque arm mechanism is adjustable. When the protective connector with new threads is replaced, the length of the telescopic torque arm mechanism can be adjusted by operating the adjustment mechanism to adjust the position of the back clamp body mechanism. This allows the position of the back clamp body mechanism to match the protective connector with the shortened length. Therefore, the protective connector with severely worn threads can be reused after reprocessing new threads, which can effectively reduce the cost of use in the later stage.

[0016] (2) The telescopic torque arm mechanism of this utility model includes an outer torque arm, an inner torque arm, multiple sets of outer torque arm positioning holes, two sets of inner torque arm positioning holes, two positioning bolts, and two positioning nuts. The length of the telescopic torque arm mechanism is easy to adjust. When it is necessary to adjust the length of the telescopic torque arm mechanism, it is only necessary to remove the two positioning bolts and two positioning nuts to adjust the length of the telescopic torque arm mechanism. After adjusting the length of the telescopic torque arm mechanism to the required length, the outer torque arm and the inner torque arm are fixedly connected together using the two positioning bolts and two positioning nuts. All components of the telescopic torque arm mechanism are conventional components, which are easy to obtain and have low manufacturing costs, and are easy to promote and use.

[0017] (3) The external torsion arm of this utility model includes an outer tube component, a reinforcing tube component and an upper connecting ear. The reinforcing tube component can enhance the overall structural strength of the external torsion arm, thereby effectively improving the reliability and stability of the structure of this utility model.

[0018] (4) The adjustment mechanism of this utility model adopts a ratchet tensioner. The position of the back clamp body mechanism can be easily adjusted by operating the ratchet tensioner, which can improve the convenience and practicality of operation.

[0019] (5) In this utility model, the connecting block and the telescopic torque arm mechanism are fixedly connected together by two fixing bolts and two fixing nuts, which can improve the firmness of the connection between the connecting block and the telescopic torque arm mechanism, and thus effectively improve the reliability and stability of the structure of this utility model.

[0020] In summary, this utility model has a simple structure, low manufacturing cost, is easy to use, and is highly practical. After replacing the protective connector with a newly machined thread, the length of the telescopic torque arm mechanism can be adjusted by operating the adjustment mechanism to adjust the position of the back clamp body mechanism. This allows the position of the back clamp body mechanism to match the shortened protective connector. Therefore, the protective connector with severely worn threads can be reused after re-machined with new threads, effectively reducing subsequent usage costs. This utility model is suitable for installation on top drives. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a structural schematic diagram from another angle of an embodiment of the present utility model; Figure 3 This is a disassembly diagram of an embodiment of the present utility model; In the diagram: 1. Connector mechanism; 2. Outer tube component; 3. Reinforcing tube component; 4. Upper connecting lug; 5. Upper shackle; 6. Outer torque arm positioning hole; 7. Fixing bolt; 8. Inner tube component; 9. Inner torque arm positioning hole; 10. Positioning bolt; 11. Back clamp body; 12. Lower connecting lug; 13. Lower shackle; 14. Ratchet tensioner body; 15. Operating handle. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0024] Example: A back clamp assembly applied to a top drive like Figure 1-3 As shown, this embodiment includes a connector mechanism 1, a telescopic torque arm mechanism fixed on the connector mechanism 1, a back clamp body mechanism fixed on the telescopic torque arm mechanism, and an adjustment mechanism located between the telescopic torque arm mechanism and the back clamp body mechanism. By operating the adjustment mechanism, the length of the telescopic torque arm mechanism can be adjusted to achieve the adjustment of the position of the back clamp body mechanism.

[0025] The connector mechanism 1 includes a connector block and two connectors fixed on the connector block. The connector block is a rectangular block and is integrally formed with the two connectors.

[0026] The telescopic torque arm mechanism includes an outer torque arm fixed to the lower end of the connector mechanism 1 and an inner torque arm slidably connected within the outer torque arm. The outer torque arm has multiple sets of outer torque arm positioning holes 6, and the inner torque arm has two sets of inner torque arm positioning holes 9. Two positioning bolts 10 are respectively inserted into the aligned outer torque arm positioning holes 6 and inner torque arm positioning holes 9, and two positioning nuts are used to fix the outer torque arm and inner torque arm together. The multiple sets of outer torque arm positioning holes 6 are arranged at equal intervals along the vertical direction, and the two sets of inner torque arm positioning holes 9 are arranged at intervals along the vertical direction. The distance between two adjacent sets of outer torque arm positioning holes 6 is equal to the distance between two sets of inner torque arm positioning holes 9. In this embodiment, the distance between two adjacent sets of outer torque arm positioning holes 6 is 50mm, and the distance between two sets of inner torque arm positioning holes 9 is 50mm. Specifically, in this embodiment, the outer torque arm includes an outer tube component 2, a reinforcing tube component 3 fixed to the lower end of the outer tube component 2, and an upper connecting lug 4 fixed to the outer wall of the reinforcing tube component 3. Both the outer tube component 2 and the reinforcing tube component 3 are rectangular tubes. The inner torque arm includes an inner tube component 8, which is also a rectangular tube. The outer tube component 2 has five sets of outer torque arm positioning holes 6. The distance between any two adjacent sets of outer torque arm positioning holes 6 is 50mm. Two positioning bolts 10 are inserted into the aligned outer torque arm positioning holes 6 and inner torque arm positioning holes 9, respectively, and two positioning nuts are used to fix the outer tube component 2 and the inner tube component 8 together. The lower end of the connecting block and the upper end of the telescopic torque arm mechanism are fixedly connected together by two fixing bolts 7 and two fixing nuts. Specifically, in this embodiment, the lower end of the connecting block is inserted into the upper part of the outer tube component 2 and fixedly connected together by two fixing bolts 7 and two fixing nuts. It should be noted that after the old protective connector is worn out and processed once, the length of the new protective connector with new threads is usually 20mm shorter than that of the old protective connector. Usually, when the old protective connector is processed twice, the back clamp body mechanism needs to be moved up by 50mm so that the position of the back clamp body mechanism can be matched with the position of the new protective connector with new threads.

[0027] The back clamp body mechanism includes a back clamp body 11 and a lower connecting lug 12 fixed to the outer wall of the back clamp body 11. The back clamp body 11 is an existing structure, so its structure will not be described in detail. The back clamp body mechanism is fixed on the inner torque arm. Specifically, in this embodiment, the back clamp body mechanism is fixed on the inner tube component 8. An upper shackle 5 is hung on the upper connecting lug 4, and a lower shackle 13 is hung on the lower connecting lug 12. Both the upper shackle 5 and the lower shackle 13 are horseshoe-shaped shackles.

[0028] The adjustment mechanism adopts a ratchet tensioner, which includes a ratchet tensioner body 14 and an operating handle 15 detachably connected to the ratchet tensioner body 14. Specifically, the operating handle 15 is threadedly connected to the ratchet tensioner body 14. The upper hook on the ratchet tensioner is hung on the upper shackle 5, and the lower hook on the ratchet tensioner is hung on the lower shackle 13.

[0029] When using this embodiment, when it is necessary to adjust the position of the back clamp body mechanism, remove the two positioning bolts 10 and the two positioning nuts, install the operating handle 15 on the ratchet tensioner body 14, rotate the operating handle 15 to move the back clamp body mechanism upward into place, and then use the two positioning bolts 10 and the two positioning nuts to fix the outer tube component 2 and the inner tube component 8 together.

[0030] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A back clamp assembly for use in top drives, characterized in that: It includes a connector mechanism, a telescopic torque arm mechanism fixed on the connector mechanism, a back clamp body mechanism fixed on the telescopic torque arm mechanism, and an adjustment mechanism located between the telescopic torque arm mechanism and the back clamp body mechanism. By operating the adjustment mechanism, the length of the telescopic torque arm mechanism can be adjusted to achieve the adjustment of the position of the back clamp body mechanism. The telescopic torque arm mechanism includes an outer torque arm fixed to the lower end of the connector mechanism and an inner torque arm slidably connected within the outer torque arm; the outer torque arm has multiple sets of outer torque arm positioning holes, and the inner torque arm has two sets of inner torque arm positioning holes. Two positioning bolts are respectively inserted into the aligned outer torque arm positioning holes and inner torque arm positioning holes, and two positioning nuts are used to fix the outer torque arm and inner torque arm together; the back clamp body mechanism is fixed on the inner torque arm.

2. The back clamp assembly for a top drive according to claim 1, characterized in that: The external torque arm includes an outer tube component, a reinforcing tube component fixed to the lower end of the outer tube component, and an upper connecting lug fixed to the outer wall of the reinforcing tube component.

3. A back clamp assembly for a top drive according to claim 2, characterized in that: The back clamp body mechanism includes a back clamp body and a lower connecting ear fixed on the outer side wall of the back clamp body.

4. A back clamp assembly for a top drive according to claim 3, characterized in that: The upper connecting ear is equipped with an upper shackle, and the lower connecting ear is equipped with a lower shackle.

5. A back clamp assembly for a top drive according to any one of claims 1-4, characterized in that: The adjustment mechanism uses a ratchet tensioner.

6. A back clamp assembly for a top drive according to claim 5, characterized in that: The ratchet tensioner includes a ratchet tensioner body and an operating handle detachably connected to the ratchet tensioner body.

7. A back clamp assembly for a top drive according to claim 6, characterized in that: The connector mechanism includes a connector block and two connectors fixed to the connector block.

8. A back clamp assembly for a top drive according to claim 7, characterized in that: The connecting block and the upper end of the telescopic torque arm mechanism are fixedly connected together by two fixing bolts and two fixing nuts.

9. A back clamp assembly for a top drive according to any one of claims 1-4, characterized in that: The spacing between adjacent sets of external torque arm positioning holes is 50mm, and the spacing between two sets of internal torque arm positioning holes is 50mm.

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